Initial import

15 files changed, 5856 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
new file mode 100644
index 000000000..9f7dbd189
--- /dev/null
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -0,0 +1,140 @@
+#
+# PMBus chip drivers configuration
+#
+
+menuconfig PMBUS
+	tristate "PMBus support"
+	depends on I2C
+	default n
+	help
+	  Say yes here if you want to enable PMBus support.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called pmbus_core.
+
+if PMBUS
+
+config SENSORS_PMBUS
+	tristate "Generic PMBus devices"
+	default y
+	help
+	  If you say yes here you get hardware monitoring support for generic
+	  PMBus devices, including but not limited to ADP4000, BMR453, BMR454,
+	  MDT040, NCP4200, NCP4208, PDT003, PDT006, PDT012, UDT020, and TPS40400.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called pmbus.
+
+config SENSORS_ADM1275
+	tristate "Analog Devices ADM1275 and compatibles"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Analog
+	  Devices ADM1075, ADM1275, and ADM1276 Hot-Swap Controller and Digital
+	  Power Monitors.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called adm1275.
+
+config SENSORS_LM25066
+	tristate "National Semiconductor LM25066 and compatibles"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for National
+	  Semiconductor LM25056, LM25066, LM5064, and LM5066.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called lm25066.
+
+config SENSORS_LTC2978
+	tristate "Linear Technologies LTC2978 and compatibles"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Linear
+	  Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, and LTM4676.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ltc2978.
+
+config SENSORS_LTC2978_REGULATOR
+	bool "Regulator support for LTC2978 and compatibles"
+	depends on SENSORS_LTC2978 && REGULATOR
+	help
+	  If you say yes here you get regulator support for Linear
+	  Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, and LTM4676.
+
+config SENSORS_MAX16064
+	tristate "Maxim MAX16064"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Maxim
+	  MAX16064.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max16064.
+
+config SENSORS_MAX34440
+	tristate "Maxim MAX34440 and compatibles"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Maxim
+	  MAX34440, MAX34441, MAX34446, MAX34460, and MAX34461.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max34440.
+
+config SENSORS_MAX8688
+	tristate "Maxim MAX8688"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Maxim
+	  MAX8688.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max8688.
+
+config SENSORS_TPS40422
+	tristate "TI TPS40422"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for TI
+	  TPS40422.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tps40422.
+
+config SENSORS_UCD9000
+	tristate "TI UCD90120, UCD90124, UCD9090, UCD90910"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for TI
+	  UCD90120, UCD90124, UCD9090, UCD90910 Sequencer and System Health
+	  Controllers.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ucd9000.
+
+config SENSORS_UCD9200
+	tristate "TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, UCD9248"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for TI
+	  UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248
+	  Digital PWM System Controllers.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ucd9200.
+
+config SENSORS_ZL6100
+	tristate "Intersil ZL6100 and compatibles"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Intersil
+	  ZL2004, ZL2005, ZL2006, ZL2008, ZL2105, ZL2106, ZL6100, ZL6105,
+	  ZL9101M, and ZL9117M Digital DC/DC Controllers, as well as for
+	  Ericsson BMR450, BMR451, BMR462, BMR463, and BMR464.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called zl6100.
+
+endif # PMBUS
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
new file mode 100644
index 000000000..1454293e9
--- /dev/null
+++ b/drivers/hwmon/pmbus/Makefile
@@ -0,0 +1,16 @@
+#
+# Makefile for PMBus chip drivers.
+#
+
+obj-$(CONFIG_PMBUS)		+= pmbus_core.o
+obj-$(CONFIG_SENSORS_PMBUS)	+= pmbus.o
+obj-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
+obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
+obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
+obj-$(CONFIG_SENSORS_MAX16064)	+= max16064.o
+obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
+obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
+obj-$(CONFIG_SENSORS_TPS40422)	+= tps40422.o
+obj-$(CONFIG_SENSORS_UCD9000)	+= ucd9000.o
+obj-$(CONFIG_SENSORS_UCD9200)	+= ucd9200.o
+obj-$(CONFIG_SENSORS_ZL6100)	+= zl6100.o
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
new file mode 100644
index 000000000..60aad9570
--- /dev/null
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -0,0 +1,397 @@
+/*
+ * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
+ * and Digital Power Monitor
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+enum chips { adm1075, adm1275, adm1276 };
+
+#define ADM1275_PEAK_IOUT		0xd0
+#define ADM1275_PEAK_VIN		0xd1
+#define ADM1275_PEAK_VOUT		0xd2
+#define ADM1275_PMON_CONFIG		0xd4
+
+#define ADM1275_VIN_VOUT_SELECT		(1 << 6)
+#define ADM1275_VRANGE			(1 << 5)
+#define ADM1075_IRANGE_50		(1 << 4)
+#define ADM1075_IRANGE_25		(1 << 3)
+#define ADM1075_IRANGE_MASK		((1 << 3) | (1 << 4))
+
+#define ADM1275_IOUT_WARN2_LIMIT	0xd7
+#define ADM1275_DEVICE_CONFIG		0xd8
+
+#define ADM1275_IOUT_WARN2_SELECT	(1 << 4)
+
+#define ADM1276_PEAK_PIN		0xda
+
+#define ADM1275_MFR_STATUS_IOUT_WARN2	(1 << 0)
+
+#define ADM1075_READ_VAUX		0xdd
+#define ADM1075_VAUX_OV_WARN_LIMIT	0xde
+#define ADM1075_VAUX_UV_WARN_LIMIT	0xdf
+#define ADM1075_VAUX_STATUS		0xf6
+
+#define ADM1075_VAUX_OV_WARN		(1<<7)
+#define ADM1075_VAUX_UV_WARN		(1<<6)
+
+struct adm1275_data {
+	int id;
+	bool have_oc_fault;
+	struct pmbus_driver_info info;
+};
+
+#define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)
+
+static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct adm1275_data *data = to_adm1275_data(info);
+	int ret = 0;
+
+	if (page)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_IOUT_UC_FAULT_LIMIT:
+		if (data->have_oc_fault) {
+			ret = -ENXIO;
+			break;
+		}
+		ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
+		break;
+	case PMBUS_IOUT_OC_FAULT_LIMIT:
+		if (!data->have_oc_fault) {
+			ret = -ENXIO;
+			break;
+		}
+		ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
+		break;
+	case PMBUS_VOUT_OV_WARN_LIMIT:
+		if (data->id != adm1075) {
+			ret = -ENODATA;
+			break;
+		}
+		ret = pmbus_read_word_data(client, 0,
+					   ADM1075_VAUX_OV_WARN_LIMIT);
+		break;
+	case PMBUS_VOUT_UV_WARN_LIMIT:
+		if (data->id != adm1075) {
+			ret = -ENODATA;
+			break;
+		}
+		ret = pmbus_read_word_data(client, 0,
+					   ADM1075_VAUX_UV_WARN_LIMIT);
+		break;
+	case PMBUS_READ_VOUT:
+		if (data->id != adm1075) {
+			ret = -ENODATA;
+			break;
+		}
+		ret = pmbus_read_word_data(client, 0, ADM1075_READ_VAUX);
+		break;
+	case PMBUS_VIRT_READ_IOUT_MAX:
+		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
+		break;
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
+		break;
+	case PMBUS_VIRT_READ_VIN_MAX:
+		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
+		break;
+	case PMBUS_VIRT_READ_PIN_MAX:
+		if (data->id == adm1275) {
+			ret = -ENXIO;
+			break;
+		}
+		ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+	case PMBUS_VIRT_RESET_VIN_HISTORY:
+		break;
+	case PMBUS_VIRT_RESET_PIN_HISTORY:
+		if (data->id == adm1275)
+			ret = -ENXIO;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
+				   u16 word)
+{
+	int ret;
+
+	if (page)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_IOUT_UC_FAULT_LIMIT:
+	case PMBUS_IOUT_OC_FAULT_LIMIT:
+		ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
+					    word);
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
+		break;
+	case PMBUS_VIRT_RESET_VIN_HISTORY:
+		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
+		break;
+	case PMBUS_VIRT_RESET_PIN_HISTORY:
+		ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct adm1275_data *data = to_adm1275_data(info);
+	int mfr_status, ret;
+
+	if (page > 0)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_STATUS_IOUT:
+		ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
+		if (ret < 0)
+			break;
+		mfr_status = pmbus_read_byte_data(client, page,
+						  PMBUS_STATUS_MFR_SPECIFIC);
+		if (mfr_status < 0) {
+			ret = mfr_status;
+			break;
+		}
+		if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
+			ret |= data->have_oc_fault ?
+			  PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
+		}
+		break;
+	case PMBUS_STATUS_VOUT:
+		if (data->id != adm1075) {
+			ret = -ENODATA;
+			break;
+		}
+		ret = 0;
+		mfr_status = pmbus_read_byte_data(client, 0,
+						  ADM1075_VAUX_STATUS);
+		if (mfr_status & ADM1075_VAUX_OV_WARN)
+			ret |= PB_VOLTAGE_OV_WARNING;
+		if (mfr_status & ADM1075_VAUX_UV_WARN)
+			ret |= PB_VOLTAGE_UV_WARNING;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static const struct i2c_device_id adm1275_id[] = {
+	{ "adm1075", adm1075 },
+	{ "adm1275", adm1275 },
+	{ "adm1276", adm1276 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, adm1275_id);
+
+static int adm1275_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+	int config, device_config;
+	int ret;
+	struct pmbus_driver_info *info;
+	struct adm1275_data *data;
+	const struct i2c_device_id *mid;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_BYTE_DATA
+				     | I2C_FUNC_SMBUS_BLOCK_DATA))
+		return -ENODEV;
+
+	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read Manufacturer ID\n");
+		return ret;
+	}
+	if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
+		dev_err(&client->dev, "Unsupported Manufacturer ID\n");
+		return -ENODEV;
+	}
+
+	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read Manufacturer Model\n");
+		return ret;
+	}
+	for (mid = adm1275_id; mid->name[0]; mid++) {
+		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
+			break;
+	}
+	if (!mid->name[0]) {
+		dev_err(&client->dev, "Unsupported device\n");
+		return -ENODEV;
+	}
+
+	if (id->driver_data != mid->driver_data)
+		dev_notice(&client->dev,
+			   "Device mismatch: Configured %s, detected %s\n",
+			   id->name, mid->name);
+
+	config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
+	if (config < 0)
+		return config;
+
+	device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
+	if (device_config < 0)
+		return device_config;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = mid->driver_data;
+
+	info = &data->info;
+
+	info->pages = 1;
+	info->format[PSC_VOLTAGE_IN] = direct;
+	info->format[PSC_VOLTAGE_OUT] = direct;
+	info->format[PSC_CURRENT_OUT] = direct;
+	info->m[PSC_CURRENT_OUT] = 807;
+	info->b[PSC_CURRENT_OUT] = 20475;
+	info->R[PSC_CURRENT_OUT] = -1;
+	info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+
+	info->read_word_data = adm1275_read_word_data;
+	info->read_byte_data = adm1275_read_byte_data;
+	info->write_word_data = adm1275_write_word_data;
+
+	if (data->id == adm1075) {
+		info->m[PSC_VOLTAGE_IN] = 27169;
+		info->b[PSC_VOLTAGE_IN] = 0;
+		info->R[PSC_VOLTAGE_IN] = -1;
+		info->m[PSC_VOLTAGE_OUT] = 27169;
+		info->b[PSC_VOLTAGE_OUT] = 0;
+		info->R[PSC_VOLTAGE_OUT] = -1;
+	} else if (config & ADM1275_VRANGE) {
+		info->m[PSC_VOLTAGE_IN] = 19199;
+		info->b[PSC_VOLTAGE_IN] = 0;
+		info->R[PSC_VOLTAGE_IN] = -2;
+		info->m[PSC_VOLTAGE_OUT] = 19199;
+		info->b[PSC_VOLTAGE_OUT] = 0;
+		info->R[PSC_VOLTAGE_OUT] = -2;
+	} else {
+		info->m[PSC_VOLTAGE_IN] = 6720;
+		info->b[PSC_VOLTAGE_IN] = 0;
+		info->R[PSC_VOLTAGE_IN] = -1;
+		info->m[PSC_VOLTAGE_OUT] = 6720;
+		info->b[PSC_VOLTAGE_OUT] = 0;
+		info->R[PSC_VOLTAGE_OUT] = -1;
+	}
+
+	if (device_config & ADM1275_IOUT_WARN2_SELECT)
+		data->have_oc_fault = true;
+
+	switch (data->id) {
+	case adm1075:
+		info->format[PSC_POWER] = direct;
+		info->b[PSC_POWER] = 0;
+		info->R[PSC_POWER] = -1;
+		switch (config & ADM1075_IRANGE_MASK) {
+		case ADM1075_IRANGE_25:
+			info->m[PSC_POWER] = 8549;
+			info->m[PSC_CURRENT_OUT] = 806;
+			break;
+		case ADM1075_IRANGE_50:
+			info->m[PSC_POWER] = 4279;
+			info->m[PSC_CURRENT_OUT] = 404;
+			break;
+		default:
+			dev_err(&client->dev, "Invalid input current range");
+			info->m[PSC_POWER] = 0;
+			info->m[PSC_CURRENT_OUT] = 0;
+			break;
+		}
+		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
+		  | PMBUS_HAVE_STATUS_INPUT;
+		if (config & ADM1275_VIN_VOUT_SELECT)
+			info->func[0] |=
+			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+		break;
+	case adm1275:
+		if (config & ADM1275_VIN_VOUT_SELECT)
+			info->func[0] |=
+			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+		else
+			info->func[0] |=
+			  PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
+		break;
+	case adm1276:
+		info->format[PSC_POWER] = direct;
+		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
+		  | PMBUS_HAVE_STATUS_INPUT;
+		if (config & ADM1275_VIN_VOUT_SELECT)
+			info->func[0] |=
+			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+		if (config & ADM1275_VRANGE) {
+			info->m[PSC_POWER] = 6043;
+			info->b[PSC_POWER] = 0;
+			info->R[PSC_POWER] = -2;
+		} else {
+			info->m[PSC_POWER] = 2115;
+			info->b[PSC_POWER] = 0;
+			info->R[PSC_POWER] = -1;
+		}
+		break;
+	}
+
+	return pmbus_do_probe(client, id, info);
+}
+
+static struct i2c_driver adm1275_driver = {
+	.driver = {
+		   .name = "adm1275",
+		   },
+	.probe = adm1275_probe,
+	.remove = pmbus_do_remove,
+	.id_table = adm1275_id,
+};
+
+module_i2c_driver(adm1275_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/lm25066.c b/drivers/hwmon/pmbus/lm25066.c
new file mode 100644
index 000000000..a26b1d1d9
--- /dev/null
+++ b/drivers/hwmon/pmbus/lm25066.c
@@ -0,0 +1,530 @@
+/*
+ * Hardware monitoring driver for LM25056 / LM25063 / LM25066 / LM5064 / LM5066
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ * Copyright (c) 2013 Guenter Roeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+enum chips { lm25056, lm25063, lm25066, lm5064, lm5066 };
+
+#define LM25066_READ_VAUX		0xd0
+#define LM25066_MFR_READ_IIN		0xd1
+#define LM25066_MFR_READ_PIN		0xd2
+#define LM25066_MFR_IIN_OC_WARN_LIMIT	0xd3
+#define LM25066_MFR_PIN_OP_WARN_LIMIT	0xd4
+#define LM25066_READ_PIN_PEAK		0xd5
+#define LM25066_CLEAR_PIN_PEAK		0xd6
+#define LM25066_DEVICE_SETUP		0xd9
+#define LM25066_READ_AVG_VIN		0xdc
+#define LM25066_READ_AVG_VOUT		0xdd
+#define LM25066_READ_AVG_IIN		0xde
+#define LM25066_READ_AVG_PIN		0xdf
+
+#define LM25066_DEV_SETUP_CL		(1 << 4)	/* Current limit */
+
+/* LM25056 only */
+
+#define LM25056_VAUX_OV_WARN_LIMIT	0xe3
+#define LM25056_VAUX_UV_WARN_LIMIT	0xe4
+
+#define LM25056_MFR_STS_VAUX_OV_WARN	(1 << 1)
+#define LM25056_MFR_STS_VAUX_UV_WARN	(1 << 0)
+
+/* LM25063 only */
+
+#define LM25063_READ_VOUT_MAX		0xe5
+#define LM25063_READ_VOUT_MIN		0xe6
+
+struct __coeff {
+	short m, b, R;
+};
+
+#define PSC_CURRENT_IN_L	(PSC_NUM_CLASSES)
+#define PSC_POWER_L		(PSC_NUM_CLASSES + 1)
+
+static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = {
+	[lm25056] = {
+		[PSC_VOLTAGE_IN] = {
+			.m = 16296,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN] = {
+			.m = 13797,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN_L] = {
+			.m = 6726,
+			.R = -2,
+		},
+		[PSC_POWER] = {
+			.m = 5501,
+			.R = -3,
+		},
+		[PSC_POWER_L] = {
+			.m = 26882,
+			.R = -4,
+		},
+		[PSC_TEMPERATURE] = {
+			.m = 1580,
+			.b = -14500,
+			.R = -2,
+		},
+	},
+	[lm25066] = {
+		[PSC_VOLTAGE_IN] = {
+			.m = 22070,
+			.R = -2,
+		},
+		[PSC_VOLTAGE_OUT] = {
+			.m = 22070,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN] = {
+			.m = 13661,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN_L] = {
+			.m = 6852,
+			.R = -2,
+		},
+		[PSC_POWER] = {
+			.m = 736,
+			.R = -2,
+		},
+		[PSC_POWER_L] = {
+			.m = 369,
+			.R = -2,
+		},
+		[PSC_TEMPERATURE] = {
+			.m = 16,
+		},
+	},
+	[lm25063] = {
+		[PSC_VOLTAGE_IN] = {
+			.m = 16000,
+			.R = -2,
+		},
+		[PSC_VOLTAGE_OUT] = {
+			.m = 16000,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN] = {
+			.m = 10000,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN_L] = {
+			.m = 10000,
+			.R = -2,
+		},
+		[PSC_POWER] = {
+			.m = 5000,
+			.R = -3,
+		},
+		[PSC_POWER_L] = {
+			.m = 5000,
+			.R = -3,
+		},
+		[PSC_TEMPERATURE] = {
+			.m = 15596,
+			.R = -3,
+		},
+	},
+	[lm5064] = {
+		[PSC_VOLTAGE_IN] = {
+			.m = 4611,
+			.R = -2,
+		},
+		[PSC_VOLTAGE_OUT] = {
+			.m = 4621,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN] = {
+			.m = 10742,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN_L] = {
+			.m = 5456,
+			.R = -2,
+		},
+		[PSC_POWER] = {
+			.m = 1204,
+			.R = -3,
+		},
+		[PSC_POWER_L] = {
+			.m = 612,
+			.R = -3,
+		},
+		[PSC_TEMPERATURE] = {
+			.m = 16,
+		},
+	},
+	[lm5066] = {
+		[PSC_VOLTAGE_IN] = {
+			.m = 4587,
+			.R = -2,
+		},
+		[PSC_VOLTAGE_OUT] = {
+			.m = 4587,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN] = {
+			.m = 10753,
+			.R = -2,
+		},
+		[PSC_CURRENT_IN_L] = {
+			.m = 5405,
+			.R = -2,
+		},
+		[PSC_POWER] = {
+			.m = 1204,
+			.R = -3,
+		},
+		[PSC_POWER_L] = {
+			.m = 605,
+			.R = -3,
+		},
+		[PSC_TEMPERATURE] = {
+			.m = 16,
+		},
+	},
+};
+
+struct lm25066_data {
+	int id;
+	u16 rlimit;			/* Maximum register value */
+	struct pmbus_driver_info info;
+};
+
+#define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
+
+static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct lm25066_data *data = to_lm25066_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VMON:
+		ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
+		if (ret < 0)
+			break;
+		/* Adjust returned value to match VIN coefficients */
+		switch (data->id) {
+		case lm25056:
+			/* VIN: 6.14 mV VAUX: 293 uV LSB */
+			ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
+			break;
+		case lm25063:
+			/* VIN: 6.25 mV VAUX: 200.0 uV LSB */
+			ret = DIV_ROUND_CLOSEST(ret * 20, 625);
+			break;
+		case lm25066:
+			/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
+			ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
+			break;
+		case lm5064:
+			/* VIN: 4.53 mV VAUX: 700 uV LSB */
+			ret = DIV_ROUND_CLOSEST(ret * 70, 453);
+			break;
+		case lm5066:
+			/* VIN: 2.18 mV VAUX: 725 uV LSB */
+			ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
+			break;
+		}
+		break;
+	case PMBUS_READ_IIN:
+		ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
+		break;
+	case PMBUS_READ_PIN:
+		ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
+		break;
+	case PMBUS_IIN_OC_WARN_LIMIT:
+		ret = pmbus_read_word_data(client, 0,
+					   LM25066_MFR_IIN_OC_WARN_LIMIT);
+		break;
+	case PMBUS_PIN_OP_WARN_LIMIT:
+		ret = pmbus_read_word_data(client, 0,
+					   LM25066_MFR_PIN_OP_WARN_LIMIT);
+		break;
+	case PMBUS_VIRT_READ_VIN_AVG:
+		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
+		break;
+	case PMBUS_VIRT_READ_VOUT_AVG:
+		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
+		break;
+	case PMBUS_VIRT_READ_IIN_AVG:
+		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
+		break;
+	case PMBUS_VIRT_READ_PIN_AVG:
+		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
+		break;
+	case PMBUS_VIRT_READ_PIN_MAX:
+		ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
+		break;
+	case PMBUS_VIRT_RESET_PIN_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
+		break;
+	case PMBUS_VIRT_READ_VOUT_MIN:
+		ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
+		break;
+	default:
+		ret = lm25066_read_word_data(client, page, reg);
+		break;
+	}
+	return ret;
+}
+
+static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+		ret = pmbus_read_word_data(client, 0,
+					   LM25056_VAUX_UV_WARN_LIMIT);
+		if (ret < 0)
+			break;
+		/* Adjust returned value to match VIN coefficients */
+		ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
+		break;
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+		ret = pmbus_read_word_data(client, 0,
+					   LM25056_VAUX_OV_WARN_LIMIT);
+		if (ret < 0)
+			break;
+		/* Adjust returned value to match VIN coefficients */
+		ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
+		break;
+	default:
+		ret = lm25066_read_word_data(client, page, reg);
+		break;
+	}
+	return ret;
+}
+
+static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	int ret, s;
+
+	switch (reg) {
+	case PMBUS_VIRT_STATUS_VMON:
+		ret = pmbus_read_byte_data(client, 0,
+					   PMBUS_STATUS_MFR_SPECIFIC);
+		if (ret < 0)
+			break;
+		s = 0;
+		if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
+			s |= PB_VOLTAGE_UV_WARNING;
+		if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
+			s |= PB_VOLTAGE_OV_WARNING;
+		ret = s;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
+				   u16 word)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct lm25066_data *data = to_lm25066_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_POUT_OP_FAULT_LIMIT:
+	case PMBUS_POUT_OP_WARN_LIMIT:
+	case PMBUS_VOUT_UV_WARN_LIMIT:
+	case PMBUS_OT_FAULT_LIMIT:
+	case PMBUS_OT_WARN_LIMIT:
+	case PMBUS_IIN_OC_FAULT_LIMIT:
+	case PMBUS_VIN_UV_WARN_LIMIT:
+	case PMBUS_VIN_UV_FAULT_LIMIT:
+	case PMBUS_VIN_OV_FAULT_LIMIT:
+	case PMBUS_VIN_OV_WARN_LIMIT:
+		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
+		ret = pmbus_write_word_data(client, 0, reg, word);
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_IIN_OC_WARN_LIMIT:
+		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
+		ret = pmbus_write_word_data(client, 0,
+					    LM25066_MFR_IIN_OC_WARN_LIMIT,
+					    word);
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_PIN_OP_WARN_LIMIT:
+		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
+		ret = pmbus_write_word_data(client, 0,
+					    LM25066_MFR_PIN_OP_WARN_LIMIT,
+					    word);
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+		/* Adjust from VIN coefficients (for LM25056) */
+		word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
+		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
+		ret = pmbus_write_word_data(client, 0,
+					    LM25056_VAUX_UV_WARN_LIMIT, word);
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+		/* Adjust from VIN coefficients (for LM25056) */
+		word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
+		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
+		ret = pmbus_write_word_data(client, 0,
+					    LM25056_VAUX_OV_WARN_LIMIT, word);
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_RESET_PIN_HISTORY:
+		ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int lm25066_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	int config;
+	struct lm25066_data *data;
+	struct pmbus_driver_info *info;
+	struct __coeff *coeff;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_BYTE_DATA))
+		return -ENODEV;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
+	if (config < 0)
+		return config;
+
+	data->id = id->driver_data;
+	info = &data->info;
+
+	info->pages = 1;
+	info->format[PSC_VOLTAGE_IN] = direct;
+	info->format[PSC_VOLTAGE_OUT] = direct;
+	info->format[PSC_CURRENT_IN] = direct;
+	info->format[PSC_TEMPERATURE] = direct;
+	info->format[PSC_POWER] = direct;
+
+	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
+	  | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
+	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+
+	if (data->id == lm25056) {
+		info->func[0] |= PMBUS_HAVE_STATUS_VMON;
+		info->read_word_data = lm25056_read_word_data;
+		info->read_byte_data = lm25056_read_byte_data;
+		data->rlimit = 0x0fff;
+	} else if (data->id == lm25063) {
+		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_POUT;
+		info->read_word_data = lm25063_read_word_data;
+		data->rlimit = 0xffff;
+	} else {
+		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+		info->read_word_data = lm25066_read_word_data;
+		data->rlimit = 0x0fff;
+	}
+	info->write_word_data = lm25066_write_word_data;
+
+	coeff = &lm25066_coeff[data->id][0];
+	info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
+	info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
+	info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
+	info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
+	info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
+	info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
+	info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
+	info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
+	info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
+	info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
+	info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
+	info->b[PSC_POWER] = coeff[PSC_POWER].b;
+	info->R[PSC_POWER] = coeff[PSC_POWER].R;
+	if (config & LM25066_DEV_SETUP_CL) {
+		info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
+		info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
+	} else {
+		info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
+		info->m[PSC_POWER] = coeff[PSC_POWER].m;
+	}
+
+	return pmbus_do_probe(client, id, info);
+}
+
+static const struct i2c_device_id lm25066_id[] = {
+	{"lm25056", lm25056},
+	{"lm25063", lm25063},
+	{"lm25066", lm25066},
+	{"lm5064", lm5064},
+	{"lm5066", lm5066},
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, lm25066_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver lm25066_driver = {
+	.driver = {
+		   .name = "lm25066",
+		   },
+	.probe = lm25066_probe,
+	.remove = pmbus_do_remove,
+	.id_table = lm25066_id,
+};
+
+module_i2c_driver(lm25066_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
new file mode 100644
index 000000000..0835050ec
--- /dev/null
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -0,0 +1,544 @@
+/*
+ * Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,
+ * LTC3883, and LTM4676
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ * Copyright (c) 2013, 2014 Guenter Roeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regulator/driver.h>
+#include "pmbus.h"
+
+enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
+
+/* Common for all chips */
+#define LTC2978_MFR_VOUT_PEAK		0xdd
+#define LTC2978_MFR_VIN_PEAK		0xde
+#define LTC2978_MFR_TEMPERATURE_PEAK	0xdf
+#define LTC2978_MFR_SPECIAL_ID		0xe7
+
+/* LTC2974, LCT2977, and LTC2978 */
+#define LTC2978_MFR_VOUT_MIN		0xfb
+#define LTC2978_MFR_VIN_MIN		0xfc
+#define LTC2978_MFR_TEMPERATURE_MIN	0xfd
+
+/* LTC2974 only */
+#define LTC2974_MFR_IOUT_PEAK		0xd7
+#define LTC2974_MFR_IOUT_MIN		0xd8
+
+/* LTC3880, LTC3883, and LTM4676 */
+#define LTC3880_MFR_IOUT_PEAK		0xd7
+#define LTC3880_MFR_CLEAR_PEAKS		0xe3
+#define LTC3880_MFR_TEMPERATURE2_PEAK	0xf4
+
+/* LTC3883 only */
+#define LTC3883_MFR_IIN_PEAK		0xe1
+
+#define LTC2974_ID_REV1			0x0212
+#define LTC2974_ID_REV2			0x0213
+#define LTC2977_ID			0x0130
+#define LTC2978_ID_REV1			0x0121
+#define LTC2978_ID_REV2			0x0122
+#define LTC2978A_ID			0x0124
+#define LTC3880_ID			0x4000
+#define LTC3880_ID_MASK			0xff00
+#define LTC3883_ID			0x4300
+#define LTC3883_ID_MASK			0xff00
+#define LTM4676_ID			0x4480	/* datasheet claims 0x440X */
+#define LTM4676_ID_MASK			0xfff0
+
+#define LTC2974_NUM_PAGES		4
+#define LTC2978_NUM_PAGES		8
+#define LTC3880_NUM_PAGES		2
+#define LTC3883_NUM_PAGES		1
+
+/*
+ * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
+ * happens pretty much each time chip data is updated. Raw peak data therefore
+ * does not provide much value. To be able to provide useful peak data, keep an
+ * internal cache of measured peak data, which is only cleared if an explicit
+ * "clear peak" command is executed for the sensor in question.
+ */
+
+struct ltc2978_data {
+	enum chips id;
+	u16 vin_min, vin_max;
+	u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
+	u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
+	u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
+	u16 iin_max;
+	u16 temp2_max;
+	struct pmbus_driver_info info;
+};
+
+#define to_ltc2978_data(x)  container_of(x, struct ltc2978_data, info)
+
+static inline int lin11_to_val(int data)
+{
+	s16 e = ((s16)data) >> 11;
+	s32 m = (((s16)(data << 5)) >> 5);
+
+	/*
+	 * mantissa is 10 bit + sign, exponent adds up to 15 bit.
+	 * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
+	 */
+	e += 6;
+	return (e < 0 ? m >> -e : m << e);
+}
+
+static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
+					 int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct ltc2978_data *data = to_ltc2978_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VIN_MAX:
+		ret = pmbus_read_word_data(client, page, LTC2978_MFR_VIN_PEAK);
+		if (ret >= 0) {
+			if (lin11_to_val(ret) > lin11_to_val(data->vin_max))
+				data->vin_max = ret;
+			ret = data->vin_max;
+		}
+		break;
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK);
+		if (ret >= 0) {
+			/*
+			 * VOUT is 16 bit unsigned with fixed exponent,
+			 * so we can compare it directly
+			 */
+			if (ret > data->vout_max[page])
+				data->vout_max[page] = ret;
+			ret = data->vout_max[page];
+		}
+		break;
+	case PMBUS_VIRT_READ_TEMP_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   LTC2978_MFR_TEMPERATURE_PEAK);
+		if (ret >= 0) {
+			if (lin11_to_val(ret)
+			    > lin11_to_val(data->temp_max[page]))
+				data->temp_max[page] = ret;
+			ret = data->temp_max[page];
+		}
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+	case PMBUS_VIRT_RESET_VIN_HISTORY:
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct ltc2978_data *data = to_ltc2978_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VIN_MIN:
+		ret = pmbus_read_word_data(client, page, LTC2978_MFR_VIN_MIN);
+		if (ret >= 0) {
+			if (lin11_to_val(ret) < lin11_to_val(data->vin_min))
+				data->vin_min = ret;
+			ret = data->vin_min;
+		}
+		break;
+	case PMBUS_VIRT_READ_VOUT_MIN:
+		ret = pmbus_read_word_data(client, page, LTC2978_MFR_VOUT_MIN);
+		if (ret >= 0) {
+			/*
+			 * VOUT_MIN is known to not be supported on some lots
+			 * of LTC2978 revision 1, and will return the maximum
+			 * possible voltage if read. If VOUT_MAX is valid and
+			 * lower than the reading of VOUT_MIN, use it instead.
+			 */
+			if (data->vout_max[page] && ret > data->vout_max[page])
+				ret = data->vout_max[page];
+			if (ret < data->vout_min[page])
+				data->vout_min[page] = ret;
+			ret = data->vout_min[page];
+		}
+		break;
+	case PMBUS_VIRT_READ_TEMP_MIN:
+		ret = pmbus_read_word_data(client, page,
+					   LTC2978_MFR_TEMPERATURE_MIN);
+		if (ret >= 0) {
+			if (lin11_to_val(ret)
+			    < lin11_to_val(data->temp_min[page]))
+				data->temp_min[page] = ret;
+			ret = data->temp_min[page];
+		}
+		break;
+	case PMBUS_VIRT_READ_IOUT_MAX:
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+	case PMBUS_VIRT_READ_TEMP2_MAX:
+	case PMBUS_VIRT_RESET_TEMP2_HISTORY:
+		ret = -ENXIO;
+		break;
+	default:
+		ret = ltc2978_read_word_data_common(client, page, reg);
+		break;
+	}
+	return ret;
+}
+
+static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct ltc2978_data *data = to_ltc2978_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_IOUT_MAX:
+		ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_PEAK);
+		if (ret >= 0) {
+			if (lin11_to_val(ret)
+			    > lin11_to_val(data->iout_max[page]))
+				data->iout_max[page] = ret;
+			ret = data->iout_max[page];
+		}
+		break;
+	case PMBUS_VIRT_READ_IOUT_MIN:
+		ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_MIN);
+		if (ret >= 0) {
+			if (lin11_to_val(ret)
+			    < lin11_to_val(data->iout_min[page]))
+				data->iout_min[page] = ret;
+			ret = data->iout_min[page];
+		}
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = ltc2978_read_word_data(client, page, reg);
+		break;
+	}
+	return ret;
+}
+
+static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct ltc2978_data *data = to_ltc2978_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_IOUT_MAX:
+		ret = pmbus_read_word_data(client, page, LTC3880_MFR_IOUT_PEAK);
+		if (ret >= 0) {
+			if (lin11_to_val(ret)
+			    > lin11_to_val(data->iout_max[page]))
+				data->iout_max[page] = ret;
+			ret = data->iout_max[page];
+		}
+		break;
+	case PMBUS_VIRT_READ_TEMP2_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   LTC3880_MFR_TEMPERATURE2_PEAK);
+		if (ret >= 0) {
+			if (lin11_to_val(ret) > lin11_to_val(data->temp2_max))
+				data->temp2_max = ret;
+			ret = data->temp2_max;
+		}
+		break;
+	case PMBUS_VIRT_READ_VIN_MIN:
+	case PMBUS_VIRT_READ_VOUT_MIN:
+	case PMBUS_VIRT_READ_TEMP_MIN:
+		ret = -ENXIO;
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+	case PMBUS_VIRT_RESET_TEMP2_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = ltc2978_read_word_data_common(client, page, reg);
+		break;
+	}
+	return ret;
+}
+
+static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct ltc2978_data *data = to_ltc2978_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_IIN_MAX:
+		ret = pmbus_read_word_data(client, page, LTC3883_MFR_IIN_PEAK);
+		if (ret >= 0) {
+			if (lin11_to_val(ret)
+			    > lin11_to_val(data->iin_max))
+				data->iin_max = ret;
+			ret = data->iin_max;
+		}
+		break;
+	case PMBUS_VIRT_RESET_IIN_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = ltc3880_read_word_data(client, page, reg);
+		break;
+	}
+	return ret;
+}
+
+static int ltc2978_clear_peaks(struct i2c_client *client, int page,
+			       enum chips id)
+{
+	int ret;
+
+	if (id == ltc3880 || id == ltc3883)
+		ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
+	else
+		ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
+
+	return ret;
+}
+
+static int ltc2978_write_word_data(struct i2c_client *client, int page,
+				    int reg, u16 word)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct ltc2978_data *data = to_ltc2978_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_RESET_IIN_HISTORY:
+		data->iin_max = 0x7c00;
+		ret = ltc2978_clear_peaks(client, page, data->id);
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+		data->iout_max[page] = 0x7c00;
+		data->iout_min[page] = 0xfbff;
+		ret = ltc2978_clear_peaks(client, page, data->id);
+		break;
+	case PMBUS_VIRT_RESET_TEMP2_HISTORY:
+		data->temp2_max = 0x7c00;
+		ret = ltc2978_clear_peaks(client, page, data->id);
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+		data->vout_min[page] = 0xffff;
+		data->vout_max[page] = 0;
+		ret = ltc2978_clear_peaks(client, page, data->id);
+		break;
+	case PMBUS_VIRT_RESET_VIN_HISTORY:
+		data->vin_min = 0x7bff;
+		data->vin_max = 0x7c00;
+		ret = ltc2978_clear_peaks(client, page, data->id);
+		break;
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		data->temp_min[page] = 0x7bff;
+		data->temp_max[page] = 0x7c00;
+		ret = ltc2978_clear_peaks(client, page, data->id);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static const struct i2c_device_id ltc2978_id[] = {
+	{"ltc2974", ltc2974},
+	{"ltc2977", ltc2977},
+	{"ltc2978", ltc2978},
+	{"ltc3880", ltc3880},
+	{"ltc3883", ltc3883},
+	{"ltm4676", ltm4676},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ltc2978_id);
+
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+static const struct regulator_desc ltc2978_reg_desc[] = {
+	PMBUS_REGULATOR("vout", 0),
+	PMBUS_REGULATOR("vout", 1),
+	PMBUS_REGULATOR("vout", 2),
+	PMBUS_REGULATOR("vout", 3),
+	PMBUS_REGULATOR("vout", 4),
+	PMBUS_REGULATOR("vout", 5),
+	PMBUS_REGULATOR("vout", 6),
+	PMBUS_REGULATOR("vout", 7),
+};
+#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
+
+static int ltc2978_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	int chip_id, i;
+	struct ltc2978_data *data;
+	struct pmbus_driver_info *info;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_WORD_DATA))
+		return -ENODEV;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
+	if (chip_id < 0)
+		return chip_id;
+
+	if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2) {
+		data->id = ltc2974;
+	} else if (chip_id == LTC2977_ID) {
+		data->id = ltc2977;
+	} else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
+		   chip_id == LTC2978A_ID) {
+		data->id = ltc2978;
+	} else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) {
+		data->id = ltc3880;
+	} else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID) {
+		data->id = ltc3883;
+	} else if ((chip_id & LTM4676_ID_MASK) == LTM4676_ID) {
+		data->id = ltm4676;
+	} else {
+		dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
+		return -ENODEV;
+	}
+	if (data->id != id->driver_data)
+		dev_warn(&client->dev,
+			 "Device mismatch: Configured %s, detected %s\n",
+			 id->name,
+			 ltc2978_id[data->id].name);
+
+	info = &data->info;
+	info->write_word_data = ltc2978_write_word_data;
+
+	data->vin_min = 0x7bff;
+	data->vin_max = 0x7c00;
+	for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
+		data->vout_min[i] = 0xffff;
+	for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
+		data->iout_min[i] = 0xfbff;
+	for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
+		data->iout_max[i] = 0x7c00;
+	for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
+		data->temp_min[i] = 0x7bff;
+	for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
+		data->temp_max[i] = 0x7c00;
+	data->temp2_max = 0x7c00;
+
+	switch (data->id) {
+	case ltc2974:
+		info->read_word_data = ltc2974_read_word_data;
+		info->pages = LTC2974_NUM_PAGES;
+		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+		  | PMBUS_HAVE_TEMP2;
+		for (i = 0; i < info->pages; i++) {
+			info->func[i] |= PMBUS_HAVE_VOUT
+			  | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
+			  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+			  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+		}
+		break;
+	case ltc2977:
+	case ltc2978:
+		info->read_word_data = ltc2978_read_word_data;
+		info->pages = LTC2978_NUM_PAGES;
+		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+		  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+		for (i = 1; i < LTC2978_NUM_PAGES; i++) {
+			info->func[i] = PMBUS_HAVE_VOUT
+			  | PMBUS_HAVE_STATUS_VOUT;
+		}
+		break;
+	case ltc3880:
+	case ltm4676:
+		info->read_word_data = ltc3880_read_word_data;
+		info->pages = LTC3880_NUM_PAGES;
+		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+		  | PMBUS_HAVE_STATUS_INPUT
+		  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+		  | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+		  | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+		info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+		  | PMBUS_HAVE_POUT
+		  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+		break;
+	case ltc3883:
+		info->read_word_data = ltc3883_read_word_data;
+		info->pages = LTC3883_NUM_PAGES;
+		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+		  | PMBUS_HAVE_STATUS_INPUT
+		  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+		  | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+		  | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+	info->num_regulators = info->pages;
+	info->reg_desc = ltc2978_reg_desc;
+	if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
+		dev_err(&client->dev, "num_regulators too large!");
+		info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
+	}
+#endif
+
+	return pmbus_do_probe(client, id, info);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ltc2978_of_match[] = {
+	{ .compatible = "lltc,ltc2974" },
+	{ .compatible = "lltc,ltc2977" },
+	{ .compatible = "lltc,ltc2978" },
+	{ .compatible = "lltc,ltc3880" },
+	{ .compatible = "lltc,ltc3883" },
+	{ .compatible = "lltc,ltm4676" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ltc2978_of_match);
+#endif
+
+static struct i2c_driver ltc2978_driver = {
+	.driver = {
+		   .name = "ltc2978",
+		   .of_match_table = of_match_ptr(ltc2978_of_match),
+		   },
+	.probe = ltc2978_probe,
+	.remove = pmbus_do_remove,
+	.id_table = ltc2978_id,
+};
+
+module_i2c_driver(ltc2978_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, LTC3883, and LTM4676");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/max16064.c b/drivers/hwmon/pmbus/max16064.c
new file mode 100644
index 000000000..fa237a3c3
--- /dev/null
+++ b/drivers/hwmon/pmbus/max16064.c
@@ -0,0 +1,127 @@
+/*
+ * Hardware monitoring driver for Maxim MAX16064
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+#define MAX16064_MFR_VOUT_PEAK		0xd4
+#define MAX16064_MFR_TEMPERATURE_PEAK	0xd6
+
+static int max16064_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   MAX16064_MFR_VOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_TEMP_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   MAX16064_MFR_TEMPERATURE_PEAK);
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int max16064_write_word_data(struct i2c_client *client, int page,
+				    int reg, u16 word)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+		ret = pmbus_write_word_data(client, page,
+					    MAX16064_MFR_VOUT_PEAK, 0);
+		break;
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = pmbus_write_word_data(client, page,
+					    MAX16064_MFR_TEMPERATURE_PEAK,
+					    0xffff);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static struct pmbus_driver_info max16064_info = {
+	.pages = 4,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.m[PSC_VOLTAGE_IN] = 19995,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = -1,
+	.m[PSC_VOLTAGE_OUT] = 19995,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = -1,
+	.m[PSC_TEMPERATURE] = -7612,
+	.b[PSC_TEMPERATURE] = 335,
+	.R[PSC_TEMPERATURE] = -3,
+	.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
+		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
+	.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+	.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+	.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+	.read_word_data = max16064_read_word_data,
+	.write_word_data = max16064_write_word_data,
+};
+
+static int max16064_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	return pmbus_do_probe(client, id, &max16064_info);
+}
+
+static const struct i2c_device_id max16064_id[] = {
+	{"max16064", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, max16064_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max16064_driver = {
+	.driver = {
+		   .name = "max16064",
+		   },
+	.probe = max16064_probe,
+	.remove = pmbus_do_remove,
+	.id_table = max16064_id,
+};
+
+module_i2c_driver(max16064_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/max34440.c b/drivers/hwmon/pmbus/max34440.c
new file mode 100644
index 000000000..7e930c3ce
--- /dev/null
+++ b/drivers/hwmon/pmbus/max34440.c
@@ -0,0 +1,435 @@
+/*
+ * Hardware monitoring driver for Maxim MAX34440/MAX34441
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ * Copyright (c) 2012 Guenter Roeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+enum chips { max34440, max34441, max34446, max34460, max34461 };
+
+#define MAX34440_MFR_VOUT_PEAK		0xd4
+#define MAX34440_MFR_IOUT_PEAK		0xd5
+#define MAX34440_MFR_TEMPERATURE_PEAK	0xd6
+#define MAX34440_MFR_VOUT_MIN		0xd7
+
+#define MAX34446_MFR_POUT_PEAK		0xe0
+#define MAX34446_MFR_POUT_AVG		0xe1
+#define MAX34446_MFR_IOUT_AVG		0xe2
+#define MAX34446_MFR_TEMPERATURE_AVG	0xe3
+
+#define MAX34440_STATUS_OC_WARN		(1 << 0)
+#define MAX34440_STATUS_OC_FAULT	(1 << 1)
+#define MAX34440_STATUS_OT_FAULT	(1 << 5)
+#define MAX34440_STATUS_OT_WARN		(1 << 6)
+
+struct max34440_data {
+	int id;
+	struct pmbus_driver_info info;
+};
+
+#define to_max34440_data(x)  container_of(x, struct max34440_data, info)
+
+static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	int ret;
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct max34440_data *data = to_max34440_data(info);
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VOUT_MIN:
+		ret = pmbus_read_word_data(client, page,
+					   MAX34440_MFR_VOUT_MIN);
+		break;
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   MAX34440_MFR_VOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_IOUT_AVG:
+		if (data->id != max34446)
+			return -ENXIO;
+		ret = pmbus_read_word_data(client, page,
+					   MAX34446_MFR_IOUT_AVG);
+		break;
+	case PMBUS_VIRT_READ_IOUT_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   MAX34440_MFR_IOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_POUT_AVG:
+		if (data->id != max34446)
+			return -ENXIO;
+		ret = pmbus_read_word_data(client, page,
+					   MAX34446_MFR_POUT_AVG);
+		break;
+	case PMBUS_VIRT_READ_POUT_MAX:
+		if (data->id != max34446)
+			return -ENXIO;
+		ret = pmbus_read_word_data(client, page,
+					   MAX34446_MFR_POUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_TEMP_AVG:
+		if (data->id != max34446 && data->id != max34460 &&
+		    data->id != max34461)
+			return -ENXIO;
+		ret = pmbus_read_word_data(client, page,
+					   MAX34446_MFR_TEMPERATURE_AVG);
+		break;
+	case PMBUS_VIRT_READ_TEMP_MAX:
+		ret = pmbus_read_word_data(client, page,
+					   MAX34440_MFR_TEMPERATURE_PEAK);
+		break;
+	case PMBUS_VIRT_RESET_POUT_HISTORY:
+		if (data->id != max34446)
+			return -ENXIO;
+		ret = 0;
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int max34440_write_word_data(struct i2c_client *client, int page,
+				    int reg, u16 word)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct max34440_data *data = to_max34440_data(info);
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_RESET_POUT_HISTORY:
+		ret = pmbus_write_word_data(client, page,
+					    MAX34446_MFR_POUT_PEAK, 0);
+		if (ret)
+			break;
+		ret = pmbus_write_word_data(client, page,
+					    MAX34446_MFR_POUT_AVG, 0);
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+		ret = pmbus_write_word_data(client, page,
+					    MAX34440_MFR_VOUT_MIN, 0x7fff);
+		if (ret)
+			break;
+		ret = pmbus_write_word_data(client, page,
+					    MAX34440_MFR_VOUT_PEAK, 0);
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+		ret = pmbus_write_word_data(client, page,
+					    MAX34440_MFR_IOUT_PEAK, 0);
+		if (!ret && data->id == max34446)
+			ret = pmbus_write_word_data(client, page,
+					MAX34446_MFR_IOUT_AVG, 0);
+
+		break;
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = pmbus_write_word_data(client, page,
+					    MAX34440_MFR_TEMPERATURE_PEAK,
+					    0x8000);
+		if (!ret && data->id == max34446)
+			ret = pmbus_write_word_data(client, page,
+					MAX34446_MFR_TEMPERATURE_AVG, 0);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	int ret = 0;
+	int mfg_status;
+
+	if (page >= 0) {
+		ret = pmbus_set_page(client, page);
+		if (ret < 0)
+			return ret;
+	}
+
+	switch (reg) {
+	case PMBUS_STATUS_IOUT:
+		mfg_status = pmbus_read_word_data(client, 0,
+						  PMBUS_STATUS_MFR_SPECIFIC);
+		if (mfg_status < 0)
+			return mfg_status;
+		if (mfg_status & MAX34440_STATUS_OC_WARN)
+			ret |= PB_IOUT_OC_WARNING;
+		if (mfg_status & MAX34440_STATUS_OC_FAULT)
+			ret |= PB_IOUT_OC_FAULT;
+		break;
+	case PMBUS_STATUS_TEMPERATURE:
+		mfg_status = pmbus_read_word_data(client, 0,
+						  PMBUS_STATUS_MFR_SPECIFIC);
+		if (mfg_status < 0)
+			return mfg_status;
+		if (mfg_status & MAX34440_STATUS_OT_WARN)
+			ret |= PB_TEMP_OT_WARNING;
+		if (mfg_status & MAX34440_STATUS_OT_FAULT)
+			ret |= PB_TEMP_OT_FAULT;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static struct pmbus_driver_info max34440_info[] = {
+	[max34440] = {
+		.pages = 14,
+		.format[PSC_VOLTAGE_IN] = direct,
+		.format[PSC_VOLTAGE_OUT] = direct,
+		.format[PSC_TEMPERATURE] = direct,
+		.format[PSC_CURRENT_OUT] = direct,
+		.m[PSC_VOLTAGE_IN] = 1,
+		.b[PSC_VOLTAGE_IN] = 0,
+		.R[PSC_VOLTAGE_IN] = 3,	    /* R = 0 in datasheet reflects mV */
+		.m[PSC_VOLTAGE_OUT] = 1,
+		.b[PSC_VOLTAGE_OUT] = 0,
+		.R[PSC_VOLTAGE_OUT] = 3,    /* R = 0 in datasheet reflects mV */
+		.m[PSC_CURRENT_OUT] = 1,
+		.b[PSC_CURRENT_OUT] = 0,
+		.R[PSC_CURRENT_OUT] = 3,    /* R = 0 in datasheet reflects mA */
+		.m[PSC_TEMPERATURE] = 1,
+		.b[PSC_TEMPERATURE] = 0,
+		.R[PSC_TEMPERATURE] = 2,
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.read_byte_data = max34440_read_byte_data,
+		.read_word_data = max34440_read_word_data,
+		.write_word_data = max34440_write_word_data,
+	},
+	[max34441] = {
+		.pages = 12,
+		.format[PSC_VOLTAGE_IN] = direct,
+		.format[PSC_VOLTAGE_OUT] = direct,
+		.format[PSC_TEMPERATURE] = direct,
+		.format[PSC_CURRENT_OUT] = direct,
+		.format[PSC_FAN] = direct,
+		.m[PSC_VOLTAGE_IN] = 1,
+		.b[PSC_VOLTAGE_IN] = 0,
+		.R[PSC_VOLTAGE_IN] = 3,
+		.m[PSC_VOLTAGE_OUT] = 1,
+		.b[PSC_VOLTAGE_OUT] = 0,
+		.R[PSC_VOLTAGE_OUT] = 3,
+		.m[PSC_CURRENT_OUT] = 1,
+		.b[PSC_CURRENT_OUT] = 0,
+		.R[PSC_CURRENT_OUT] = 3,
+		.m[PSC_TEMPERATURE] = 1,
+		.b[PSC_TEMPERATURE] = 0,
+		.R[PSC_TEMPERATURE] = 2,
+		.m[PSC_FAN] = 1,
+		.b[PSC_FAN] = 0,
+		.R[PSC_FAN] = 0,
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
+		.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.read_byte_data = max34440_read_byte_data,
+		.read_word_data = max34440_read_word_data,
+		.write_word_data = max34440_write_word_data,
+	},
+	[max34446] = {
+		.pages = 7,
+		.format[PSC_VOLTAGE_IN] = direct,
+		.format[PSC_VOLTAGE_OUT] = direct,
+		.format[PSC_TEMPERATURE] = direct,
+		.format[PSC_CURRENT_OUT] = direct,
+		.format[PSC_POWER] = direct,
+		.m[PSC_VOLTAGE_IN] = 1,
+		.b[PSC_VOLTAGE_IN] = 0,
+		.R[PSC_VOLTAGE_IN] = 3,
+		.m[PSC_VOLTAGE_OUT] = 1,
+		.b[PSC_VOLTAGE_OUT] = 0,
+		.R[PSC_VOLTAGE_OUT] = 3,
+		.m[PSC_CURRENT_OUT] = 1,
+		.b[PSC_CURRENT_OUT] = 0,
+		.R[PSC_CURRENT_OUT] = 3,
+		.m[PSC_POWER] = 1,
+		.b[PSC_POWER] = 0,
+		.R[PSC_POWER] = 3,
+		.m[PSC_TEMPERATURE] = 1,
+		.b[PSC_TEMPERATURE] = 0,
+		.R[PSC_TEMPERATURE] = 2,
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
+		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+		.func[4] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[5] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.read_byte_data = max34440_read_byte_data,
+		.read_word_data = max34440_read_word_data,
+		.write_word_data = max34440_write_word_data,
+	},
+	[max34460] = {
+		.pages = 18,
+		.format[PSC_VOLTAGE_OUT] = direct,
+		.format[PSC_TEMPERATURE] = direct,
+		.m[PSC_VOLTAGE_OUT] = 1,
+		.b[PSC_VOLTAGE_OUT] = 0,
+		.R[PSC_VOLTAGE_OUT] = 3,
+		.m[PSC_TEMPERATURE] = 1,
+		.b[PSC_TEMPERATURE] = 0,
+		.R[PSC_TEMPERATURE] = 2,
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[6] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[7] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[8] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[9] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[10] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[11] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[14] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[15] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[16] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[17] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.read_byte_data = max34440_read_byte_data,
+		.read_word_data = max34440_read_word_data,
+		.write_word_data = max34440_write_word_data,
+	},
+	[max34461] = {
+		.pages = 23,
+		.format[PSC_VOLTAGE_OUT] = direct,
+		.format[PSC_TEMPERATURE] = direct,
+		.m[PSC_VOLTAGE_OUT] = 1,
+		.b[PSC_VOLTAGE_OUT] = 0,
+		.R[PSC_VOLTAGE_OUT] = 3,
+		.m[PSC_TEMPERATURE] = 1,
+		.b[PSC_TEMPERATURE] = 0,
+		.R[PSC_TEMPERATURE] = 2,
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[6] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[7] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[8] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[9] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[10] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[11] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[12] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[13] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[14] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		.func[15] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+		/* page 16 is reserved */
+		.func[17] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[18] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[19] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[20] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.func[21] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+		.read_byte_data = max34440_read_byte_data,
+		.read_word_data = max34440_read_word_data,
+		.write_word_data = max34440_write_word_data,
+	},
+};
+
+static int max34440_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	struct max34440_data *data;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct max34440_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	data->id = id->driver_data;
+	data->info = max34440_info[id->driver_data];
+
+	return pmbus_do_probe(client, id, &data->info);
+}
+
+static const struct i2c_device_id max34440_id[] = {
+	{"max34440", max34440},
+	{"max34441", max34441},
+	{"max34446", max34446},
+	{"max34460", max34460},
+	{"max34461", max34461},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, max34440_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max34440_driver = {
+	.driver = {
+		   .name = "max34440",
+		   },
+	.probe = max34440_probe,
+	.remove = pmbus_do_remove,
+	.id_table = max34440_id,
+};
+
+module_i2c_driver(max34440_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/max8688.c b/drivers/hwmon/pmbus/max8688.c
new file mode 100644
index 000000000..f04454a42
--- /dev/null
+++ b/drivers/hwmon/pmbus/max8688.c
@@ -0,0 +1,204 @@
+/*
+ * Hardware monitoring driver for Maxim MAX8688
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+#define MAX8688_MFR_VOUT_PEAK		0xd4
+#define MAX8688_MFR_IOUT_PEAK		0xd5
+#define MAX8688_MFR_TEMPERATURE_PEAK	0xd6
+#define MAX8688_MFG_STATUS		0xd8
+
+#define MAX8688_STATUS_OC_FAULT		(1 << 4)
+#define MAX8688_STATUS_OV_FAULT		(1 << 5)
+#define MAX8688_STATUS_OV_WARNING	(1 << 8)
+#define MAX8688_STATUS_UV_FAULT		(1 << 9)
+#define MAX8688_STATUS_UV_WARNING	(1 << 10)
+#define MAX8688_STATUS_UC_FAULT		(1 << 11)
+#define MAX8688_STATUS_OC_WARNING	(1 << 12)
+#define MAX8688_STATUS_OT_FAULT		(1 << 13)
+#define MAX8688_STATUS_OT_WARNING	(1 << 14)
+
+static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	int ret;
+
+	if (page)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_IOUT_MAX:
+		ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_TEMP_MAX:
+		ret = pmbus_read_word_data(client, 0,
+					   MAX8688_MFR_TEMPERATURE_PEAK);
+		break;
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = 0;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
+				   u16 word)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_RESET_VOUT_HISTORY:
+		ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
+					    0);
+		break;
+	case PMBUS_VIRT_RESET_IOUT_HISTORY:
+		ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
+					    0);
+		break;
+	case PMBUS_VIRT_RESET_TEMP_HISTORY:
+		ret = pmbus_write_word_data(client, 0,
+					    MAX8688_MFR_TEMPERATURE_PEAK,
+					    0xffff);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	int ret = 0;
+	int mfg_status;
+
+	if (page > 0)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_STATUS_VOUT:
+		mfg_status = pmbus_read_word_data(client, 0,
+						  MAX8688_MFG_STATUS);
+		if (mfg_status < 0)
+			return mfg_status;
+		if (mfg_status & MAX8688_STATUS_UV_WARNING)
+			ret |= PB_VOLTAGE_UV_WARNING;
+		if (mfg_status & MAX8688_STATUS_UV_FAULT)
+			ret |= PB_VOLTAGE_UV_FAULT;
+		if (mfg_status & MAX8688_STATUS_OV_WARNING)
+			ret |= PB_VOLTAGE_OV_WARNING;
+		if (mfg_status & MAX8688_STATUS_OV_FAULT)
+			ret |= PB_VOLTAGE_OV_FAULT;
+		break;
+	case PMBUS_STATUS_IOUT:
+		mfg_status = pmbus_read_word_data(client, 0,
+						  MAX8688_MFG_STATUS);
+		if (mfg_status < 0)
+			return mfg_status;
+		if (mfg_status & MAX8688_STATUS_UC_FAULT)
+			ret |= PB_IOUT_UC_FAULT;
+		if (mfg_status & MAX8688_STATUS_OC_WARNING)
+			ret |= PB_IOUT_OC_WARNING;
+		if (mfg_status & MAX8688_STATUS_OC_FAULT)
+			ret |= PB_IOUT_OC_FAULT;
+		break;
+	case PMBUS_STATUS_TEMPERATURE:
+		mfg_status = pmbus_read_word_data(client, 0,
+						  MAX8688_MFG_STATUS);
+		if (mfg_status < 0)
+			return mfg_status;
+		if (mfg_status & MAX8688_STATUS_OT_WARNING)
+			ret |= PB_TEMP_OT_WARNING;
+		if (mfg_status & MAX8688_STATUS_OT_FAULT)
+			ret |= PB_TEMP_OT_FAULT;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static struct pmbus_driver_info max8688_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.m[PSC_VOLTAGE_IN] = 19995,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = -1,
+	.m[PSC_VOLTAGE_OUT] = 19995,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = -1,
+	.m[PSC_CURRENT_OUT] = 23109,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = -2,
+	.m[PSC_TEMPERATURE] = -7612,
+	.b[PSC_TEMPERATURE] = 335,
+	.R[PSC_TEMPERATURE] = -3,
+	.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
+		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
+		| PMBUS_HAVE_STATUS_TEMP,
+	.read_byte_data = max8688_read_byte_data,
+	.read_word_data = max8688_read_word_data,
+	.write_word_data = max8688_write_word_data,
+};
+
+static int max8688_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	return pmbus_do_probe(client, id, &max8688_info);
+}
+
+static const struct i2c_device_id max8688_id[] = {
+	{"max8688", 0},
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, max8688_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max8688_driver = {
+	.driver = {
+		   .name = "max8688",
+		   },
+	.probe = max8688_probe,
+	.remove = pmbus_do_remove,
+	.id_table = max8688_id,
+};
+
+module_i2c_driver(max8688_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c
new file mode 100644
index 000000000..554d0249d
--- /dev/null
+++ b/drivers/hwmon/pmbus/pmbus.c
@@ -0,0 +1,216 @@
+/*
+ * Hardware monitoring driver for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+/*
+ * Find sensor groups and status registers on each page.
+ */
+static void pmbus_find_sensor_groups(struct i2c_client *client,
+				     struct pmbus_driver_info *info)
+{
+	int page;
+
+	/* Sensors detected on page 0 only */
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
+		info->func[0] |= PMBUS_HAVE_VIN;
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
+		info->func[0] |= PMBUS_HAVE_VCAP;
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
+		info->func[0] |= PMBUS_HAVE_IIN;
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
+		info->func[0] |= PMBUS_HAVE_PIN;
+	if (info->func[0]
+	    && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
+		info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
+	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
+	    pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
+		info->func[0] |= PMBUS_HAVE_FAN12;
+		if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
+			info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
+	}
+	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
+	    pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
+		info->func[0] |= PMBUS_HAVE_FAN34;
+		if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
+			info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
+	}
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1))
+		info->func[0] |= PMBUS_HAVE_TEMP;
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2))
+		info->func[0] |= PMBUS_HAVE_TEMP2;
+	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3))
+		info->func[0] |= PMBUS_HAVE_TEMP3;
+	if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
+			     | PMBUS_HAVE_TEMP3)
+	    && pmbus_check_byte_register(client, 0,
+					 PMBUS_STATUS_TEMPERATURE))
+			info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
+
+	/* Sensors detected on all pages */
+	for (page = 0; page < info->pages; page++) {
+		if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
+			info->func[page] |= PMBUS_HAVE_VOUT;
+			if (pmbus_check_byte_register(client, page,
+						      PMBUS_STATUS_VOUT))
+				info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
+		}
+		if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
+			info->func[page] |= PMBUS_HAVE_IOUT;
+			if (pmbus_check_byte_register(client, 0,
+						      PMBUS_STATUS_IOUT))
+				info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
+		}
+		if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
+			info->func[page] |= PMBUS_HAVE_POUT;
+	}
+}
+
+/*
+ * Identify chip parameters.
+ */
+static int pmbus_identify(struct i2c_client *client,
+			  struct pmbus_driver_info *info)
+{
+	int ret = 0;
+
+	if (!info->pages) {
+		/*
+		 * Check if the PAGE command is supported. If it is,
+		 * keep setting the page number until it fails or until the
+		 * maximum number of pages has been reached. Assume that
+		 * this is the number of pages supported by the chip.
+		 */
+		if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
+			int page;
+
+			for (page = 1; page < PMBUS_PAGES; page++) {
+				if (pmbus_set_page(client, page) < 0)
+					break;
+			}
+			pmbus_set_page(client, 0);
+			info->pages = page;
+		} else {
+			info->pages = 1;
+		}
+	}
+
+	if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {
+		int vout_mode;
+
+		vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+		if (vout_mode >= 0 && vout_mode != 0xff) {
+			switch (vout_mode >> 5) {
+			case 0:
+				break;
+			case 1:
+				info->format[PSC_VOLTAGE_OUT] = vid;
+				break;
+			case 2:
+				info->format[PSC_VOLTAGE_OUT] = direct;
+				break;
+			default:
+				ret = -ENODEV;
+				goto abort;
+			}
+		}
+	}
+
+	/*
+	 * We should check if the COEFFICIENTS register is supported.
+	 * If it is, and the chip is configured for direct mode, we can read
+	 * the coefficients from the chip, one set per group of sensor
+	 * registers.
+	 *
+	 * To do this, we will need access to a chip which actually supports the
+	 * COEFFICIENTS command, since the command is too complex to implement
+	 * without testing it. Until then, abort if a chip configured for direct
+	 * mode was detected.
+	 */
+	if (info->format[PSC_VOLTAGE_OUT] == direct) {
+		ret = -ENODEV;
+		goto abort;
+	}
+
+	/* Try to find sensor groups  */
+	pmbus_find_sensor_groups(client, info);
+abort:
+	return ret;
+}
+
+static int pmbus_probe(struct i2c_client *client,
+		       const struct i2c_device_id *id)
+{
+	struct pmbus_driver_info *info;
+
+	info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->pages = id->driver_data;
+	info->identify = pmbus_identify;
+
+	return pmbus_do_probe(client, id, info);
+}
+
+/*
+ * Use driver_data to set the number of pages supported by the chip.
+ */
+static const struct i2c_device_id pmbus_id[] = {
+	{"adp4000", 1},
+	{"bmr453", 1},
+	{"bmr454", 1},
+	{"mdt040", 1},
+	{"ncp4200", 1},
+	{"ncp4208", 1},
+	{"pdt003", 1},
+	{"pdt006", 1},
+	{"pdt012", 1},
+	{"pmbus", 0},
+	{"tps40400", 1},
+	{"udt020", 1},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, pmbus_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver pmbus_driver = {
+	.driver = {
+		   .name = "pmbus",
+		   },
+	.probe = pmbus_probe,
+	.remove = pmbus_do_remove,
+	.id_table = pmbus_id,
+};
+
+module_i2c_driver(pmbus_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("Generic PMBus driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
new file mode 100644
index 000000000..89a23ff83
--- /dev/null
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -0,0 +1,417 @@
+/*
+ * pmbus.h - Common defines and structures for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 Ericsson AB.
+ * Copyright (c) 2012 Guenter Roeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/regulator/driver.h>
+
+#ifndef PMBUS_H
+#define PMBUS_H
+
+/*
+ * Registers
+ */
+#define PMBUS_PAGE			0x00
+#define PMBUS_OPERATION			0x01
+#define PMBUS_ON_OFF_CONFIG		0x02
+#define PMBUS_CLEAR_FAULTS		0x03
+#define PMBUS_PHASE			0x04
+
+#define PMBUS_CAPABILITY		0x19
+#define PMBUS_QUERY			0x1A
+
+#define PMBUS_VOUT_MODE			0x20
+#define PMBUS_VOUT_COMMAND		0x21
+#define PMBUS_VOUT_TRIM			0x22
+#define PMBUS_VOUT_CAL_OFFSET		0x23
+#define PMBUS_VOUT_MAX			0x24
+#define PMBUS_VOUT_MARGIN_HIGH		0x25
+#define PMBUS_VOUT_MARGIN_LOW		0x26
+#define PMBUS_VOUT_TRANSITION_RATE	0x27
+#define PMBUS_VOUT_DROOP		0x28
+#define PMBUS_VOUT_SCALE_LOOP		0x29
+#define PMBUS_VOUT_SCALE_MONITOR	0x2A
+
+#define PMBUS_COEFFICIENTS		0x30
+#define PMBUS_POUT_MAX			0x31
+
+#define PMBUS_FAN_CONFIG_12		0x3A
+#define PMBUS_FAN_COMMAND_1		0x3B
+#define PMBUS_FAN_COMMAND_2		0x3C
+#define PMBUS_FAN_CONFIG_34		0x3D
+#define PMBUS_FAN_COMMAND_3		0x3E
+#define PMBUS_FAN_COMMAND_4		0x3F
+
+#define PMBUS_VOUT_OV_FAULT_LIMIT	0x40
+#define PMBUS_VOUT_OV_FAULT_RESPONSE	0x41
+#define PMBUS_VOUT_OV_WARN_LIMIT	0x42
+#define PMBUS_VOUT_UV_WARN_LIMIT	0x43
+#define PMBUS_VOUT_UV_FAULT_LIMIT	0x44
+#define PMBUS_VOUT_UV_FAULT_RESPONSE	0x45
+#define PMBUS_IOUT_OC_FAULT_LIMIT	0x46
+#define PMBUS_IOUT_OC_FAULT_RESPONSE	0x47
+#define PMBUS_IOUT_OC_LV_FAULT_LIMIT	0x48
+#define PMBUS_IOUT_OC_LV_FAULT_RESPONSE	0x49
+#define PMBUS_IOUT_OC_WARN_LIMIT	0x4A
+#define PMBUS_IOUT_UC_FAULT_LIMIT	0x4B
+#define PMBUS_IOUT_UC_FAULT_RESPONSE	0x4C
+
+#define PMBUS_OT_FAULT_LIMIT		0x4F
+#define PMBUS_OT_FAULT_RESPONSE		0x50
+#define PMBUS_OT_WARN_LIMIT		0x51
+#define PMBUS_UT_WARN_LIMIT		0x52
+#define PMBUS_UT_FAULT_LIMIT		0x53
+#define PMBUS_UT_FAULT_RESPONSE		0x54
+#define PMBUS_VIN_OV_FAULT_LIMIT	0x55
+#define PMBUS_VIN_OV_FAULT_RESPONSE	0x56
+#define PMBUS_VIN_OV_WARN_LIMIT		0x57
+#define PMBUS_VIN_UV_WARN_LIMIT		0x58
+#define PMBUS_VIN_UV_FAULT_LIMIT	0x59
+
+#define PMBUS_IIN_OC_FAULT_LIMIT	0x5B
+#define PMBUS_IIN_OC_WARN_LIMIT		0x5D
+
+#define PMBUS_POUT_OP_FAULT_LIMIT	0x68
+#define PMBUS_POUT_OP_WARN_LIMIT	0x6A
+#define PMBUS_PIN_OP_WARN_LIMIT		0x6B
+
+#define PMBUS_STATUS_BYTE		0x78
+#define PMBUS_STATUS_WORD		0x79
+#define PMBUS_STATUS_VOUT		0x7A
+#define PMBUS_STATUS_IOUT		0x7B
+#define PMBUS_STATUS_INPUT		0x7C
+#define PMBUS_STATUS_TEMPERATURE	0x7D
+#define PMBUS_STATUS_CML		0x7E
+#define PMBUS_STATUS_OTHER		0x7F
+#define PMBUS_STATUS_MFR_SPECIFIC	0x80
+#define PMBUS_STATUS_FAN_12		0x81
+#define PMBUS_STATUS_FAN_34		0x82
+
+#define PMBUS_READ_VIN			0x88
+#define PMBUS_READ_IIN			0x89
+#define PMBUS_READ_VCAP			0x8A
+#define PMBUS_READ_VOUT			0x8B
+#define PMBUS_READ_IOUT			0x8C
+#define PMBUS_READ_TEMPERATURE_1	0x8D
+#define PMBUS_READ_TEMPERATURE_2	0x8E
+#define PMBUS_READ_TEMPERATURE_3	0x8F
+#define PMBUS_READ_FAN_SPEED_1		0x90
+#define PMBUS_READ_FAN_SPEED_2		0x91
+#define PMBUS_READ_FAN_SPEED_3		0x92
+#define PMBUS_READ_FAN_SPEED_4		0x93
+#define PMBUS_READ_DUTY_CYCLE		0x94
+#define PMBUS_READ_FREQUENCY		0x95
+#define PMBUS_READ_POUT			0x96
+#define PMBUS_READ_PIN			0x97
+
+#define PMBUS_REVISION			0x98
+#define PMBUS_MFR_ID			0x99
+#define PMBUS_MFR_MODEL			0x9A
+#define PMBUS_MFR_REVISION		0x9B
+#define PMBUS_MFR_LOCATION		0x9C
+#define PMBUS_MFR_DATE			0x9D
+#define PMBUS_MFR_SERIAL		0x9E
+
+/*
+ * Virtual registers.
+ * Useful to support attributes which are not supported by standard PMBus
+ * registers but exist as manufacturer specific registers on individual chips.
+ * Must be mapped to real registers in device specific code.
+ *
+ * Semantics:
+ * Virtual registers are all word size.
+ * READ registers are read-only; writes are either ignored or return an error.
+ * RESET registers are read/write. Reading reset registers returns zero
+ * (used for detection), writing any value causes the associated history to be
+ * reset.
+ * Virtual registers have to be handled in device specific driver code. Chip
+ * driver code returns non-negative register values if a virtual register is
+ * supported, or a negative error code if not. The chip driver may return
+ * -ENODATA or any other error code in this case, though an error code other
+ * than -ENODATA is handled more efficiently and thus preferred. Either case,
+ * the calling PMBus core code will abort if the chip driver returns an error
+ * code when reading or writing virtual registers.
+ */
+#define PMBUS_VIRT_BASE			0x100
+#define PMBUS_VIRT_READ_TEMP_AVG	(PMBUS_VIRT_BASE + 0)
+#define PMBUS_VIRT_READ_TEMP_MIN	(PMBUS_VIRT_BASE + 1)
+#define PMBUS_VIRT_READ_TEMP_MAX	(PMBUS_VIRT_BASE + 2)
+#define PMBUS_VIRT_RESET_TEMP_HISTORY	(PMBUS_VIRT_BASE + 3)
+#define PMBUS_VIRT_READ_VIN_AVG		(PMBUS_VIRT_BASE + 4)
+#define PMBUS_VIRT_READ_VIN_MIN		(PMBUS_VIRT_BASE + 5)
+#define PMBUS_VIRT_READ_VIN_MAX		(PMBUS_VIRT_BASE + 6)
+#define PMBUS_VIRT_RESET_VIN_HISTORY	(PMBUS_VIRT_BASE + 7)
+#define PMBUS_VIRT_READ_IIN_AVG		(PMBUS_VIRT_BASE + 8)
+#define PMBUS_VIRT_READ_IIN_MIN		(PMBUS_VIRT_BASE + 9)
+#define PMBUS_VIRT_READ_IIN_MAX		(PMBUS_VIRT_BASE + 10)
+#define PMBUS_VIRT_RESET_IIN_HISTORY	(PMBUS_VIRT_BASE + 11)
+#define PMBUS_VIRT_READ_PIN_AVG		(PMBUS_VIRT_BASE + 12)
+#define PMBUS_VIRT_READ_PIN_MAX		(PMBUS_VIRT_BASE + 13)
+#define PMBUS_VIRT_RESET_PIN_HISTORY	(PMBUS_VIRT_BASE + 14)
+#define PMBUS_VIRT_READ_POUT_AVG	(PMBUS_VIRT_BASE + 15)
+#define PMBUS_VIRT_READ_POUT_MAX	(PMBUS_VIRT_BASE + 16)
+#define PMBUS_VIRT_RESET_POUT_HISTORY	(PMBUS_VIRT_BASE + 17)
+#define PMBUS_VIRT_READ_VOUT_AVG	(PMBUS_VIRT_BASE + 18)
+#define PMBUS_VIRT_READ_VOUT_MIN	(PMBUS_VIRT_BASE + 19)
+#define PMBUS_VIRT_READ_VOUT_MAX	(PMBUS_VIRT_BASE + 20)
+#define PMBUS_VIRT_RESET_VOUT_HISTORY	(PMBUS_VIRT_BASE + 21)
+#define PMBUS_VIRT_READ_IOUT_AVG	(PMBUS_VIRT_BASE + 22)
+#define PMBUS_VIRT_READ_IOUT_MIN	(PMBUS_VIRT_BASE + 23)
+#define PMBUS_VIRT_READ_IOUT_MAX	(PMBUS_VIRT_BASE + 24)
+#define PMBUS_VIRT_RESET_IOUT_HISTORY	(PMBUS_VIRT_BASE + 25)
+#define PMBUS_VIRT_READ_TEMP2_AVG	(PMBUS_VIRT_BASE + 26)
+#define PMBUS_VIRT_READ_TEMP2_MIN	(PMBUS_VIRT_BASE + 27)
+#define PMBUS_VIRT_READ_TEMP2_MAX	(PMBUS_VIRT_BASE + 28)
+#define PMBUS_VIRT_RESET_TEMP2_HISTORY	(PMBUS_VIRT_BASE + 29)
+
+#define PMBUS_VIRT_READ_VMON		(PMBUS_VIRT_BASE + 30)
+#define PMBUS_VIRT_VMON_UV_WARN_LIMIT	(PMBUS_VIRT_BASE + 31)
+#define PMBUS_VIRT_VMON_OV_WARN_LIMIT	(PMBUS_VIRT_BASE + 32)
+#define PMBUS_VIRT_VMON_UV_FAULT_LIMIT	(PMBUS_VIRT_BASE + 33)
+#define PMBUS_VIRT_VMON_OV_FAULT_LIMIT	(PMBUS_VIRT_BASE + 34)
+#define PMBUS_VIRT_STATUS_VMON		(PMBUS_VIRT_BASE + 35)
+
+/*
+ * OPERATION
+ */
+#define PB_OPERATION_CONTROL_ON		(1<<7)
+
+/*
+ * CAPABILITY
+ */
+#define PB_CAPABILITY_SMBALERT		(1<<4)
+#define PB_CAPABILITY_ERROR_CHECK	(1<<7)
+
+/*
+ * VOUT_MODE
+ */
+#define PB_VOUT_MODE_MODE_MASK		0xe0
+#define PB_VOUT_MODE_PARAM_MASK		0x1f
+
+#define PB_VOUT_MODE_LINEAR		0x00
+#define PB_VOUT_MODE_VID		0x20
+#define PB_VOUT_MODE_DIRECT		0x40
+
+/*
+ * Fan configuration
+ */
+#define PB_FAN_2_PULSE_MASK		((1 << 0) | (1 << 1))
+#define PB_FAN_2_RPM			(1 << 2)
+#define PB_FAN_2_INSTALLED		(1 << 3)
+#define PB_FAN_1_PULSE_MASK		((1 << 4) | (1 << 5))
+#define PB_FAN_1_RPM			(1 << 6)
+#define PB_FAN_1_INSTALLED		(1 << 7)
+
+/*
+ * STATUS_BYTE, STATUS_WORD (lower)
+ */
+#define PB_STATUS_NONE_ABOVE		(1<<0)
+#define PB_STATUS_CML			(1<<1)
+#define PB_STATUS_TEMPERATURE		(1<<2)
+#define PB_STATUS_VIN_UV		(1<<3)
+#define PB_STATUS_IOUT_OC		(1<<4)
+#define PB_STATUS_VOUT_OV		(1<<5)
+#define PB_STATUS_OFF			(1<<6)
+#define PB_STATUS_BUSY			(1<<7)
+
+/*
+ * STATUS_WORD (upper)
+ */
+#define PB_STATUS_UNKNOWN		(1<<8)
+#define PB_STATUS_OTHER			(1<<9)
+#define PB_STATUS_FANS			(1<<10)
+#define PB_STATUS_POWER_GOOD_N		(1<<11)
+#define PB_STATUS_WORD_MFR		(1<<12)
+#define PB_STATUS_INPUT			(1<<13)
+#define PB_STATUS_IOUT_POUT		(1<<14)
+#define PB_STATUS_VOUT			(1<<15)
+
+/*
+ * STATUS_IOUT
+ */
+#define PB_POUT_OP_WARNING		(1<<0)
+#define PB_POUT_OP_FAULT		(1<<1)
+#define PB_POWER_LIMITING		(1<<2)
+#define PB_CURRENT_SHARE_FAULT		(1<<3)
+#define PB_IOUT_UC_FAULT		(1<<4)
+#define PB_IOUT_OC_WARNING		(1<<5)
+#define PB_IOUT_OC_LV_FAULT		(1<<6)
+#define PB_IOUT_OC_FAULT		(1<<7)
+
+/*
+ * STATUS_VOUT, STATUS_INPUT
+ */
+#define PB_VOLTAGE_UV_FAULT		(1<<4)
+#define PB_VOLTAGE_UV_WARNING		(1<<5)
+#define PB_VOLTAGE_OV_WARNING		(1<<6)
+#define PB_VOLTAGE_OV_FAULT		(1<<7)
+
+/*
+ * STATUS_INPUT
+ */
+#define PB_PIN_OP_WARNING		(1<<0)
+#define PB_IIN_OC_WARNING		(1<<1)
+#define PB_IIN_OC_FAULT			(1<<2)
+
+/*
+ * STATUS_TEMPERATURE
+ */
+#define PB_TEMP_UT_FAULT		(1<<4)
+#define PB_TEMP_UT_WARNING		(1<<5)
+#define PB_TEMP_OT_WARNING		(1<<6)
+#define PB_TEMP_OT_FAULT		(1<<7)
+
+/*
+ * STATUS_FAN
+ */
+#define PB_FAN_AIRFLOW_WARNING		(1<<0)
+#define PB_FAN_AIRFLOW_FAULT		(1<<1)
+#define PB_FAN_FAN2_SPEED_OVERRIDE	(1<<2)
+#define PB_FAN_FAN1_SPEED_OVERRIDE	(1<<3)
+#define PB_FAN_FAN2_WARNING		(1<<4)
+#define PB_FAN_FAN1_WARNING		(1<<5)
+#define PB_FAN_FAN2_FAULT		(1<<6)
+#define PB_FAN_FAN1_FAULT		(1<<7)
+
+/*
+ * CML_FAULT_STATUS
+ */
+#define PB_CML_FAULT_OTHER_MEM_LOGIC	(1<<0)
+#define PB_CML_FAULT_OTHER_COMM		(1<<1)
+#define PB_CML_FAULT_PROCESSOR		(1<<3)
+#define PB_CML_FAULT_MEMORY		(1<<4)
+#define PB_CML_FAULT_PACKET_ERROR	(1<<5)
+#define PB_CML_FAULT_INVALID_DATA	(1<<6)
+#define PB_CML_FAULT_INVALID_COMMAND	(1<<7)
+
+enum pmbus_sensor_classes {
+	PSC_VOLTAGE_IN = 0,
+	PSC_VOLTAGE_OUT,
+	PSC_CURRENT_IN,
+	PSC_CURRENT_OUT,
+	PSC_POWER,
+	PSC_TEMPERATURE,
+	PSC_FAN,
+	PSC_NUM_CLASSES		/* Number of power sensor classes */
+};
+
+#define PMBUS_PAGES	32	/* Per PMBus specification */
+
+/* Functionality bit mask */
+#define PMBUS_HAVE_VIN		(1 << 0)
+#define PMBUS_HAVE_VCAP		(1 << 1)
+#define PMBUS_HAVE_VOUT		(1 << 2)
+#define PMBUS_HAVE_IIN		(1 << 3)
+#define PMBUS_HAVE_IOUT		(1 << 4)
+#define PMBUS_HAVE_PIN		(1 << 5)
+#define PMBUS_HAVE_POUT		(1 << 6)
+#define PMBUS_HAVE_FAN12	(1 << 7)
+#define PMBUS_HAVE_FAN34	(1 << 8)
+#define PMBUS_HAVE_TEMP		(1 << 9)
+#define PMBUS_HAVE_TEMP2	(1 << 10)
+#define PMBUS_HAVE_TEMP3	(1 << 11)
+#define PMBUS_HAVE_STATUS_VOUT	(1 << 12)
+#define PMBUS_HAVE_STATUS_IOUT	(1 << 13)
+#define PMBUS_HAVE_STATUS_INPUT	(1 << 14)
+#define PMBUS_HAVE_STATUS_TEMP	(1 << 15)
+#define PMBUS_HAVE_STATUS_FAN12	(1 << 16)
+#define PMBUS_HAVE_STATUS_FAN34	(1 << 17)
+#define PMBUS_HAVE_VMON		(1 << 18)
+#define PMBUS_HAVE_STATUS_VMON	(1 << 19)
+
+enum pmbus_data_format { linear = 0, direct, vid };
+
+struct pmbus_driver_info {
+	int pages;		/* Total number of pages */
+	enum pmbus_data_format format[PSC_NUM_CLASSES];
+	/*
+	 * Support one set of coefficients for each sensor type
+	 * Used for chips providing data in direct mode.
+	 */
+	int m[PSC_NUM_CLASSES];	/* mantissa for direct data format */
+	int b[PSC_NUM_CLASSES];	/* offset */
+	int R[PSC_NUM_CLASSES];	/* exponent */
+
+	u32 func[PMBUS_PAGES];	/* Functionality, per page */
+	/*
+	 * The following functions map manufacturing specific register values
+	 * to PMBus standard register values. Specify only if mapping is
+	 * necessary.
+	 * Functions return the register value (read) or zero (write) if
+	 * successful. A return value of -ENODATA indicates that there is no
+	 * manufacturer specific register, but that a standard PMBus register
+	 * may exist. Any other negative return value indicates that the
+	 * register does not exist, and that no attempt should be made to read
+	 * the standard register.
+	 */
+	int (*read_byte_data)(struct i2c_client *client, int page, int reg);
+	int (*read_word_data)(struct i2c_client *client, int page, int reg);
+	int (*write_word_data)(struct i2c_client *client, int page, int reg,
+			       u16 word);
+	int (*write_byte)(struct i2c_client *client, int page, u8 value);
+	/*
+	 * The identify function determines supported PMBus functionality.
+	 * This function is only necessary if a chip driver supports multiple
+	 * chips, and the chip functionality is not pre-determined.
+	 */
+	int (*identify)(struct i2c_client *client,
+			struct pmbus_driver_info *info);
+
+	/* Regulator functionality, if supported by this chip driver. */
+	int num_regulators;
+	const struct regulator_desc *reg_desc;
+};
+
+/* Regulator ops */
+
+extern struct regulator_ops pmbus_regulator_ops;
+
+/* Macro for filling in array of struct regulator_desc */
+#define PMBUS_REGULATOR(_name, _id)				\
+	[_id] = {						\
+		.name = (_name # _id),				\
+		.id = (_id),					\
+		.of_match = of_match_ptr(_name # _id),		\
+		.regulators_node = of_match_ptr("regulators"),	\
+		.ops = &pmbus_regulator_ops,			\
+		.owner = THIS_MODULE,				\
+	}
+
+/* Function declarations */
+
+void pmbus_clear_cache(struct i2c_client *client);
+int pmbus_set_page(struct i2c_client *client, u8 page);
+int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg);
+int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word);
+int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg);
+int pmbus_write_byte(struct i2c_client *client, int page, u8 value);
+int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg,
+			  u8 value);
+int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
+			   u8 mask, u8 value);
+void pmbus_clear_faults(struct i2c_client *client);
+bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);
+bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
+int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
+		   struct pmbus_driver_info *info);
+int pmbus_do_remove(struct i2c_client *client);
+const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
+						      *client);
+
+#endif /* PMBUS_H */
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
new file mode 100644
index 000000000..f2e47c7dd
--- /dev/null
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -0,0 +1,1921 @@
+/*
+ * Hardware monitoring driver for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 Ericsson AB.
+ * Copyright (c) 2012 Guenter Roeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+#include <linux/i2c/pmbus.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include "pmbus.h"
+
+/*
+ * Number of additional attribute pointers to allocate
+ * with each call to krealloc
+ */
+#define PMBUS_ATTR_ALLOC_SIZE	32
+
+/*
+ * Index into status register array, per status register group
+ */
+#define PB_STATUS_BASE		0
+#define PB_STATUS_VOUT_BASE	(PB_STATUS_BASE + PMBUS_PAGES)
+#define PB_STATUS_IOUT_BASE	(PB_STATUS_VOUT_BASE + PMBUS_PAGES)
+#define PB_STATUS_FAN_BASE	(PB_STATUS_IOUT_BASE + PMBUS_PAGES)
+#define PB_STATUS_FAN34_BASE	(PB_STATUS_FAN_BASE + PMBUS_PAGES)
+#define PB_STATUS_TEMP_BASE	(PB_STATUS_FAN34_BASE + PMBUS_PAGES)
+#define PB_STATUS_INPUT_BASE	(PB_STATUS_TEMP_BASE + PMBUS_PAGES)
+#define PB_STATUS_VMON_BASE	(PB_STATUS_INPUT_BASE + 1)
+
+#define PB_NUM_STATUS_REG	(PB_STATUS_VMON_BASE + 1)
+
+#define PMBUS_NAME_SIZE		24
+
+struct pmbus_sensor {
+	struct pmbus_sensor *next;
+	char name[PMBUS_NAME_SIZE];	/* sysfs sensor name */
+	struct device_attribute attribute;
+	u8 page;		/* page number */
+	u16 reg;		/* register */
+	enum pmbus_sensor_classes class;	/* sensor class */
+	bool update;		/* runtime sensor update needed */
+	int data;		/* Sensor data.
+				   Negative if there was a read error */
+};
+#define to_pmbus_sensor(_attr) \
+	container_of(_attr, struct pmbus_sensor, attribute)
+
+struct pmbus_boolean {
+	char name[PMBUS_NAME_SIZE];	/* sysfs boolean name */
+	struct sensor_device_attribute attribute;
+	struct pmbus_sensor *s1;
+	struct pmbus_sensor *s2;
+};
+#define to_pmbus_boolean(_attr) \
+	container_of(_attr, struct pmbus_boolean, attribute)
+
+struct pmbus_label {
+	char name[PMBUS_NAME_SIZE];	/* sysfs label name */
+	struct device_attribute attribute;
+	char label[PMBUS_NAME_SIZE];	/* label */
+};
+#define to_pmbus_label(_attr) \
+	container_of(_attr, struct pmbus_label, attribute)
+
+struct pmbus_data {
+	struct device *dev;
+	struct device *hwmon_dev;
+
+	u32 flags;		/* from platform data */
+
+	int exponent[PMBUS_PAGES];
+				/* linear mode: exponent for output voltages */
+
+	const struct pmbus_driver_info *info;
+
+	int max_attributes;
+	int num_attributes;
+	struct attribute_group group;
+	const struct attribute_group *groups[2];
+
+	struct pmbus_sensor *sensors;
+
+	struct mutex update_lock;
+	bool valid;
+	unsigned long last_updated;	/* in jiffies */
+
+	/*
+	 * A single status register covers multiple attributes,
+	 * so we keep them all together.
+	 */
+	u8 status[PB_NUM_STATUS_REG];
+	u8 status_register;
+
+	u8 currpage;
+};
+
+void pmbus_clear_cache(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	data->valid = false;
+}
+EXPORT_SYMBOL_GPL(pmbus_clear_cache);
+
+int pmbus_set_page(struct i2c_client *client, u8 page)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	int rv = 0;
+	int newpage;
+
+	if (page != data->currpage) {
+		rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+		newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
+		if (newpage != page)
+			rv = -EIO;
+		else
+			data->currpage = page;
+	}
+	return rv;
+}
+EXPORT_SYMBOL_GPL(pmbus_set_page);
+
+int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
+{
+	int rv;
+
+	if (page >= 0) {
+		rv = pmbus_set_page(client, page);
+		if (rv < 0)
+			return rv;
+	}
+
+	return i2c_smbus_write_byte(client, value);
+}
+EXPORT_SYMBOL_GPL(pmbus_write_byte);
+
+/*
+ * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
+ * a device specific mapping function exists and calls it if necessary.
+ */
+static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	const struct pmbus_driver_info *info = data->info;
+	int status;
+
+	if (info->write_byte) {
+		status = info->write_byte(client, page, value);
+		if (status != -ENODATA)
+			return status;
+	}
+	return pmbus_write_byte(client, page, value);
+}
+
+int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
+{
+	int rv;
+
+	rv = pmbus_set_page(client, page);
+	if (rv < 0)
+		return rv;
+
+	return i2c_smbus_write_word_data(client, reg, word);
+}
+EXPORT_SYMBOL_GPL(pmbus_write_word_data);
+
+/*
+ * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
+ * a device specific mapping function exists and calls it if necessary.
+ */
+static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
+				  u16 word)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	const struct pmbus_driver_info *info = data->info;
+	int status;
+
+	if (info->write_word_data) {
+		status = info->write_word_data(client, page, reg, word);
+		if (status != -ENODATA)
+			return status;
+	}
+	if (reg >= PMBUS_VIRT_BASE)
+		return -ENXIO;
+	return pmbus_write_word_data(client, page, reg, word);
+}
+
+int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
+{
+	int rv;
+
+	rv = pmbus_set_page(client, page);
+	if (rv < 0)
+		return rv;
+
+	return i2c_smbus_read_word_data(client, reg);
+}
+EXPORT_SYMBOL_GPL(pmbus_read_word_data);
+
+/*
+ * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
+ * a device specific mapping function exists and calls it if necessary.
+ */
+static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	const struct pmbus_driver_info *info = data->info;
+	int status;
+
+	if (info->read_word_data) {
+		status = info->read_word_data(client, page, reg);
+		if (status != -ENODATA)
+			return status;
+	}
+	if (reg >= PMBUS_VIRT_BASE)
+		return -ENXIO;
+	return pmbus_read_word_data(client, page, reg);
+}
+
+int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
+{
+	int rv;
+
+	if (page >= 0) {
+		rv = pmbus_set_page(client, page);
+		if (rv < 0)
+			return rv;
+	}
+
+	return i2c_smbus_read_byte_data(client, reg);
+}
+EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
+
+int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
+{
+	int rv;
+
+	rv = pmbus_set_page(client, page);
+	if (rv < 0)
+		return rv;
+
+	return i2c_smbus_write_byte_data(client, reg, value);
+}
+EXPORT_SYMBOL_GPL(pmbus_write_byte_data);
+
+int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
+			   u8 mask, u8 value)
+{
+	unsigned int tmp;
+	int rv;
+
+	rv = pmbus_read_byte_data(client, page, reg);
+	if (rv < 0)
+		return rv;
+
+	tmp = (rv & ~mask) | (value & mask);
+
+	if (tmp != rv)
+		rv = pmbus_write_byte_data(client, page, reg, tmp);
+
+	return rv;
+}
+EXPORT_SYMBOL_GPL(pmbus_update_byte_data);
+
+/*
+ * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
+ * a device specific mapping function exists and calls it if necessary.
+ */
+static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	const struct pmbus_driver_info *info = data->info;
+	int status;
+
+	if (info->read_byte_data) {
+		status = info->read_byte_data(client, page, reg);
+		if (status != -ENODATA)
+			return status;
+	}
+	return pmbus_read_byte_data(client, page, reg);
+}
+
+static void pmbus_clear_fault_page(struct i2c_client *client, int page)
+{
+	_pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
+}
+
+void pmbus_clear_faults(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	int i;
+
+	for (i = 0; i < data->info->pages; i++)
+		pmbus_clear_fault_page(client, i);
+}
+EXPORT_SYMBOL_GPL(pmbus_clear_faults);
+
+static int pmbus_check_status_cml(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	int status, status2;
+
+	status = _pmbus_read_byte_data(client, -1, data->status_register);
+	if (status < 0 || (status & PB_STATUS_CML)) {
+		status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
+		if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
+			return -EIO;
+	}
+	return 0;
+}
+
+static bool pmbus_check_register(struct i2c_client *client,
+				 int (*func)(struct i2c_client *client,
+					     int page, int reg),
+				 int page, int reg)
+{
+	int rv;
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	rv = func(client, page, reg);
+	if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
+		rv = pmbus_check_status_cml(client);
+	pmbus_clear_fault_page(client, -1);
+	return rv >= 0;
+}
+
+bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
+{
+	return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
+}
+EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
+
+bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
+{
+	return pmbus_check_register(client, _pmbus_read_word_data, page, reg);
+}
+EXPORT_SYMBOL_GPL(pmbus_check_word_register);
+
+const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	return data->info;
+}
+EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
+
+static struct _pmbus_status {
+	u32 func;
+	u16 base;
+	u16 reg;
+} pmbus_status[] = {
+	{ PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT },
+	{ PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT },
+	{ PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE,
+	  PMBUS_STATUS_TEMPERATURE },
+	{ PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 },
+	{ PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 },
+};
+
+static struct pmbus_data *pmbus_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	const struct pmbus_driver_info *info = data->info;
+	struct pmbus_sensor *sensor;
+
+	mutex_lock(&data->update_lock);
+	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+		int i, j;
+
+		for (i = 0; i < info->pages; i++) {
+			data->status[PB_STATUS_BASE + i]
+			    = _pmbus_read_byte_data(client, i,
+						    data->status_register);
+			for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) {
+				struct _pmbus_status *s = &pmbus_status[j];
+
+				if (!(info->func[i] & s->func))
+					continue;
+				data->status[s->base + i]
+					= _pmbus_read_byte_data(client, i,
+								s->reg);
+			}
+		}
+
+		if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
+			data->status[PB_STATUS_INPUT_BASE]
+			  = _pmbus_read_byte_data(client, 0,
+						  PMBUS_STATUS_INPUT);
+
+		if (info->func[0] & PMBUS_HAVE_STATUS_VMON)
+			data->status[PB_STATUS_VMON_BASE]
+			  = _pmbus_read_byte_data(client, 0,
+						  PMBUS_VIRT_STATUS_VMON);
+
+		for (sensor = data->sensors; sensor; sensor = sensor->next) {
+			if (!data->valid || sensor->update)
+				sensor->data
+				    = _pmbus_read_word_data(client,
+							    sensor->page,
+							    sensor->reg);
+		}
+		pmbus_clear_faults(client);
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+	mutex_unlock(&data->update_lock);
+	return data;
+}
+
+/*
+ * Convert linear sensor values to milli- or micro-units
+ * depending on sensor type.
+ */
+static long pmbus_reg2data_linear(struct pmbus_data *data,
+				  struct pmbus_sensor *sensor)
+{
+	s16 exponent;
+	s32 mantissa;
+	long val;
+
+	if (sensor->class == PSC_VOLTAGE_OUT) {	/* LINEAR16 */
+		exponent = data->exponent[sensor->page];
+		mantissa = (u16) sensor->data;
+	} else {				/* LINEAR11 */
+		exponent = ((s16)sensor->data) >> 11;
+		mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
+	}
+
+	val = mantissa;
+
+	/* scale result to milli-units for all sensors except fans */
+	if (sensor->class != PSC_FAN)
+		val = val * 1000L;
+
+	/* scale result to micro-units for power sensors */
+	if (sensor->class == PSC_POWER)
+		val = val * 1000L;
+
+	if (exponent >= 0)
+		val <<= exponent;
+	else
+		val >>= -exponent;
+
+	return val;
+}
+
+/*
+ * Convert direct sensor values to milli- or micro-units
+ * depending on sensor type.
+ */
+static long pmbus_reg2data_direct(struct pmbus_data *data,
+				  struct pmbus_sensor *sensor)
+{
+	long val = (s16) sensor->data;
+	long m, b, R;
+
+	m = data->info->m[sensor->class];
+	b = data->info->b[sensor->class];
+	R = data->info->R[sensor->class];
+
+	if (m == 0)
+		return 0;
+
+	/* X = 1/m * (Y * 10^-R - b) */
+	R = -R;
+	/* scale result to milli-units for everything but fans */
+	if (sensor->class != PSC_FAN) {
+		R += 3;
+		b *= 1000;
+	}
+
+	/* scale result to micro-units for power sensors */
+	if (sensor->class == PSC_POWER) {
+		R += 3;
+		b *= 1000;
+	}
+
+	while (R > 0) {
+		val *= 10;
+		R--;
+	}
+	while (R < 0) {
+		val = DIV_ROUND_CLOSEST(val, 10);
+		R++;
+	}
+
+	return (val - b) / m;
+}
+
+/*
+ * Convert VID sensor values to milli- or micro-units
+ * depending on sensor type.
+ * We currently only support VR11.
+ */
+static long pmbus_reg2data_vid(struct pmbus_data *data,
+			       struct pmbus_sensor *sensor)
+{
+	long val = sensor->data;
+
+	if (val < 0x02 || val > 0xb2)
+		return 0;
+	return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
+}
+
+static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
+{
+	long val;
+
+	switch (data->info->format[sensor->class]) {
+	case direct:
+		val = pmbus_reg2data_direct(data, sensor);
+		break;
+	case vid:
+		val = pmbus_reg2data_vid(data, sensor);
+		break;
+	case linear:
+	default:
+		val = pmbus_reg2data_linear(data, sensor);
+		break;
+	}
+	return val;
+}
+
+#define MAX_MANTISSA	(1023 * 1000)
+#define MIN_MANTISSA	(511 * 1000)
+
+static u16 pmbus_data2reg_linear(struct pmbus_data *data,
+				 struct pmbus_sensor *sensor, long val)
+{
+	s16 exponent = 0, mantissa;
+	bool negative = false;
+
+	/* simple case */
+	if (val == 0)
+		return 0;
+
+	if (sensor->class == PSC_VOLTAGE_OUT) {
+		/* LINEAR16 does not support negative voltages */
+		if (val < 0)
+			return 0;
+
+		/*
+		 * For a static exponents, we don't have a choice
+		 * but to adjust the value to it.
+		 */
+		if (data->exponent[sensor->page] < 0)
+			val <<= -data->exponent[sensor->page];
+		else
+			val >>= data->exponent[sensor->page];
+		val = DIV_ROUND_CLOSEST(val, 1000);
+		return val & 0xffff;
+	}
+
+	if (val < 0) {
+		negative = true;
+		val = -val;
+	}
+
+	/* Power is in uW. Convert to mW before converting. */
+	if (sensor->class == PSC_POWER)
+		val = DIV_ROUND_CLOSEST(val, 1000L);
+
+	/*
+	 * For simplicity, convert fan data to milli-units
+	 * before calculating the exponent.
+	 */
+	if (sensor->class == PSC_FAN)
+		val = val * 1000;
+
+	/* Reduce large mantissa until it fits into 10 bit */
+	while (val >= MAX_MANTISSA && exponent < 15) {
+		exponent++;
+		val >>= 1;
+	}
+	/* Increase small mantissa to improve precision */
+	while (val < MIN_MANTISSA && exponent > -15) {
+		exponent--;
+		val <<= 1;
+	}
+
+	/* Convert mantissa from milli-units to units */
+	mantissa = DIV_ROUND_CLOSEST(val, 1000);
+
+	/* Ensure that resulting number is within range */
+	if (mantissa > 0x3ff)
+		mantissa = 0x3ff;
+
+	/* restore sign */
+	if (negative)
+		mantissa = -mantissa;
+
+	/* Convert to 5 bit exponent, 11 bit mantissa */
+	return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
+}
+
+static u16 pmbus_data2reg_direct(struct pmbus_data *data,
+				 struct pmbus_sensor *sensor, long val)
+{
+	long m, b, R;
+
+	m = data->info->m[sensor->class];
+	b = data->info->b[sensor->class];
+	R = data->info->R[sensor->class];
+
+	/* Power is in uW. Adjust R and b. */
+	if (sensor->class == PSC_POWER) {
+		R -= 3;
+		b *= 1000;
+	}
+
+	/* Calculate Y = (m * X + b) * 10^R */
+	if (sensor->class != PSC_FAN) {
+		R -= 3;		/* Adjust R and b for data in milli-units */
+		b *= 1000;
+	}
+	val = val * m + b;
+
+	while (R > 0) {
+		val *= 10;
+		R--;
+	}
+	while (R < 0) {
+		val = DIV_ROUND_CLOSEST(val, 10);
+		R++;
+	}
+
+	return val;
+}
+
+static u16 pmbus_data2reg_vid(struct pmbus_data *data,
+			      struct pmbus_sensor *sensor, long val)
+{
+	val = clamp_val(val, 500, 1600);
+
+	return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
+}
+
+static u16 pmbus_data2reg(struct pmbus_data *data,
+			  struct pmbus_sensor *sensor, long val)
+{
+	u16 regval;
+
+	switch (data->info->format[sensor->class]) {
+	case direct:
+		regval = pmbus_data2reg_direct(data, sensor, val);
+		break;
+	case vid:
+		regval = pmbus_data2reg_vid(data, sensor, val);
+		break;
+	case linear:
+	default:
+		regval = pmbus_data2reg_linear(data, sensor, val);
+		break;
+	}
+	return regval;
+}
+
+/*
+ * Return boolean calculated from converted data.
+ * <index> defines a status register index and mask.
+ * The mask is in the lower 8 bits, the register index is in bits 8..23.
+ *
+ * The associated pmbus_boolean structure contains optional pointers to two
+ * sensor attributes. If specified, those attributes are compared against each
+ * other to determine if a limit has been exceeded.
+ *
+ * If the sensor attribute pointers are NULL, the function returns true if
+ * (status[reg] & mask) is true.
+ *
+ * If sensor attribute pointers are provided, a comparison against a specified
+ * limit has to be performed to determine the boolean result.
+ * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
+ * sensor values referenced by sensor attribute pointers s1 and s2).
+ *
+ * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
+ * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
+ *
+ * If a negative value is stored in any of the referenced registers, this value
+ * reflects an error code which will be returned.
+ */
+static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b,
+			     int index)
+{
+	struct pmbus_sensor *s1 = b->s1;
+	struct pmbus_sensor *s2 = b->s2;
+	u16 reg = (index >> 8) & 0xffff;
+	u8 mask = index & 0xff;
+	int ret, status;
+	u8 regval;
+
+	status = data->status[reg];
+	if (status < 0)
+		return status;
+
+	regval = status & mask;
+	if (!s1 && !s2) {
+		ret = !!regval;
+	} else if (!s1 || !s2) {
+		WARN(1, "Bad boolean descriptor %p: s1=%p, s2=%p\n", b, s1, s2);
+		return 0;
+	} else {
+		long v1, v2;
+
+		if (s1->data < 0)
+			return s1->data;
+		if (s2->data < 0)
+			return s2->data;
+
+		v1 = pmbus_reg2data(data, s1);
+		v2 = pmbus_reg2data(data, s2);
+		ret = !!(regval && v1 >= v2);
+	}
+	return ret;
+}
+
+static ssize_t pmbus_show_boolean(struct device *dev,
+				  struct device_attribute *da, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
+	struct pmbus_data *data = pmbus_update_device(dev);
+	int val;
+
+	val = pmbus_get_boolean(data, boolean, attr->index);
+	if (val < 0)
+		return val;
+	return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static ssize_t pmbus_show_sensor(struct device *dev,
+				 struct device_attribute *devattr, char *buf)
+{
+	struct pmbus_data *data = pmbus_update_device(dev);
+	struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
+
+	if (sensor->data < 0)
+		return sensor->data;
+
+	return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
+}
+
+static ssize_t pmbus_set_sensor(struct device *dev,
+				struct device_attribute *devattr,
+				const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
+	ssize_t rv = count;
+	long val = 0;
+	int ret;
+	u16 regval;
+
+	if (kstrtol(buf, 10, &val) < 0)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	regval = pmbus_data2reg(data, sensor, val);
+	ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
+	if (ret < 0)
+		rv = ret;
+	else
+		sensor->data = regval;
+	mutex_unlock(&data->update_lock);
+	return rv;
+}
+
+static ssize_t pmbus_show_label(struct device *dev,
+				struct device_attribute *da, char *buf)
+{
+	struct pmbus_label *label = to_pmbus_label(da);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
+}
+
+static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
+{
+	if (data->num_attributes >= data->max_attributes - 1) {
+		int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
+		void *new_attrs = krealloc(data->group.attrs,
+					   new_max_attrs * sizeof(void *),
+					   GFP_KERNEL);
+		if (!new_attrs)
+			return -ENOMEM;
+		data->group.attrs = new_attrs;
+		data->max_attributes = new_max_attrs;
+	}
+
+	data->group.attrs[data->num_attributes++] = attr;
+	data->group.attrs[data->num_attributes] = NULL;
+	return 0;
+}
+
+static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
+				const char *name,
+				umode_t mode,
+				ssize_t (*show)(struct device *dev,
+						struct device_attribute *attr,
+						char *buf),
+				ssize_t (*store)(struct device *dev,
+						 struct device_attribute *attr,
+						 const char *buf, size_t count))
+{
+	sysfs_attr_init(&dev_attr->attr);
+	dev_attr->attr.name = name;
+	dev_attr->attr.mode = mode;
+	dev_attr->show = show;
+	dev_attr->store = store;
+}
+
+static void pmbus_attr_init(struct sensor_device_attribute *a,
+			    const char *name,
+			    umode_t mode,
+			    ssize_t (*show)(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf),
+			    ssize_t (*store)(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count),
+			    int idx)
+{
+	pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
+	a->index = idx;
+}
+
+static int pmbus_add_boolean(struct pmbus_data *data,
+			     const char *name, const char *type, int seq,
+			     struct pmbus_sensor *s1,
+			     struct pmbus_sensor *s2,
+			     u16 reg, u8 mask)
+{
+	struct pmbus_boolean *boolean;
+	struct sensor_device_attribute *a;
+
+	boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
+	if (!boolean)
+		return -ENOMEM;
+
+	a = &boolean->attribute;
+
+	snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
+		 name, seq, type);
+	boolean->s1 = s1;
+	boolean->s2 = s2;
+	pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL,
+			(reg << 8) | mask);
+
+	return pmbus_add_attribute(data, &a->dev_attr.attr);
+}
+
+static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
+					     const char *name, const char *type,
+					     int seq, int page, int reg,
+					     enum pmbus_sensor_classes class,
+					     bool update, bool readonly)
+{
+	struct pmbus_sensor *sensor;
+	struct device_attribute *a;
+
+	sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
+	if (!sensor)
+		return NULL;
+	a = &sensor->attribute;
+
+	snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
+		 name, seq, type);
+	sensor->page = page;
+	sensor->reg = reg;
+	sensor->class = class;
+	sensor->update = update;
+	pmbus_dev_attr_init(a, sensor->name,
+			    readonly ? S_IRUGO : S_IRUGO | S_IWUSR,
+			    pmbus_show_sensor, pmbus_set_sensor);
+
+	if (pmbus_add_attribute(data, &a->attr))
+		return NULL;
+
+	sensor->next = data->sensors;
+	data->sensors = sensor;
+
+	return sensor;
+}
+
+static int pmbus_add_label(struct pmbus_data *data,
+			   const char *name, int seq,
+			   const char *lstring, int index)
+{
+	struct pmbus_label *label;
+	struct device_attribute *a;
+
+	label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
+	if (!label)
+		return -ENOMEM;
+
+	a = &label->attribute;
+
+	snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
+	if (!index)
+		strncpy(label->label, lstring, sizeof(label->label) - 1);
+	else
+		snprintf(label->label, sizeof(label->label), "%s%d", lstring,
+			 index);
+
+	pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL);
+	return pmbus_add_attribute(data, &a->attr);
+}
+
+/*
+ * Search for attributes. Allocate sensors, booleans, and labels as needed.
+ */
+
+/*
+ * The pmbus_limit_attr structure describes a single limit attribute
+ * and its associated alarm attribute.
+ */
+struct pmbus_limit_attr {
+	u16 reg;		/* Limit register */
+	u16 sbit;		/* Alarm attribute status bit */
+	bool update;		/* True if register needs updates */
+	bool low;		/* True if low limit; for limits with compare
+				   functions only */
+	const char *attr;	/* Attribute name */
+	const char *alarm;	/* Alarm attribute name */
+};
+
+/*
+ * The pmbus_sensor_attr structure describes one sensor attribute. This
+ * description includes a reference to the associated limit attributes.
+ */
+struct pmbus_sensor_attr {
+	u16 reg;			/* sensor register */
+	u8 gbit;			/* generic status bit */
+	u8 nlimit;			/* # of limit registers */
+	enum pmbus_sensor_classes class;/* sensor class */
+	const char *label;		/* sensor label */
+	bool paged;			/* true if paged sensor */
+	bool update;			/* true if update needed */
+	bool compare;			/* true if compare function needed */
+	u32 func;			/* sensor mask */
+	u32 sfunc;			/* sensor status mask */
+	int sbase;			/* status base register */
+	const struct pmbus_limit_attr *limit;/* limit registers */
+};
+
+/*
+ * Add a set of limit attributes and, if supported, the associated
+ * alarm attributes.
+ * returns 0 if no alarm register found, 1 if an alarm register was found,
+ * < 0 on errors.
+ */
+static int pmbus_add_limit_attrs(struct i2c_client *client,
+				 struct pmbus_data *data,
+				 const struct pmbus_driver_info *info,
+				 const char *name, int index, int page,
+				 struct pmbus_sensor *base,
+				 const struct pmbus_sensor_attr *attr)
+{
+	const struct pmbus_limit_attr *l = attr->limit;
+	int nlimit = attr->nlimit;
+	int have_alarm = 0;
+	int i, ret;
+	struct pmbus_sensor *curr;
+
+	for (i = 0; i < nlimit; i++) {
+		if (pmbus_check_word_register(client, page, l->reg)) {
+			curr = pmbus_add_sensor(data, name, l->attr, index,
+						page, l->reg, attr->class,
+						attr->update || l->update,
+						false);
+			if (!curr)
+				return -ENOMEM;
+			if (l->sbit && (info->func[page] & attr->sfunc)) {
+				ret = pmbus_add_boolean(data, name,
+					l->alarm, index,
+					attr->compare ?  l->low ? curr : base
+						      : NULL,
+					attr->compare ? l->low ? base : curr
+						      : NULL,
+					attr->sbase + page, l->sbit);
+				if (ret)
+					return ret;
+				have_alarm = 1;
+			}
+		}
+		l++;
+	}
+	return have_alarm;
+}
+
+static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
+				      struct pmbus_data *data,
+				      const struct pmbus_driver_info *info,
+				      const char *name,
+				      int index, int page,
+				      const struct pmbus_sensor_attr *attr)
+{
+	struct pmbus_sensor *base;
+	int ret;
+
+	if (attr->label) {
+		ret = pmbus_add_label(data, name, index, attr->label,
+				      attr->paged ? page + 1 : 0);
+		if (ret)
+			return ret;
+	}
+	base = pmbus_add_sensor(data, name, "input", index, page, attr->reg,
+				attr->class, true, true);
+	if (!base)
+		return -ENOMEM;
+	if (attr->sfunc) {
+		ret = pmbus_add_limit_attrs(client, data, info, name,
+					    index, page, base, attr);
+		if (ret < 0)
+			return ret;
+		/*
+		 * Add generic alarm attribute only if there are no individual
+		 * alarm attributes, if there is a global alarm bit, and if
+		 * the generic status register for this page is accessible.
+		 */
+		if (!ret && attr->gbit &&
+		    pmbus_check_byte_register(client, page,
+					      data->status_register)) {
+			ret = pmbus_add_boolean(data, name, "alarm", index,
+						NULL, NULL,
+						PB_STATUS_BASE + page,
+						attr->gbit);
+			if (ret)
+				return ret;
+		}
+	}
+	return 0;
+}
+
+static int pmbus_add_sensor_attrs(struct i2c_client *client,
+				  struct pmbus_data *data,
+				  const char *name,
+				  const struct pmbus_sensor_attr *attrs,
+				  int nattrs)
+{
+	const struct pmbus_driver_info *info = data->info;
+	int index, i;
+	int ret;
+
+	index = 1;
+	for (i = 0; i < nattrs; i++) {
+		int page, pages;
+
+		pages = attrs->paged ? info->pages : 1;
+		for (page = 0; page < pages; page++) {
+			if (!(info->func[page] & attrs->func))
+				continue;
+			ret = pmbus_add_sensor_attrs_one(client, data, info,
+							 name, index, page,
+							 attrs);
+			if (ret)
+				return ret;
+			index++;
+		}
+		attrs++;
+	}
+	return 0;
+}
+
+static const struct pmbus_limit_attr vin_limit_attrs[] = {
+	{
+		.reg = PMBUS_VIN_UV_WARN_LIMIT,
+		.attr = "min",
+		.alarm = "min_alarm",
+		.sbit = PB_VOLTAGE_UV_WARNING,
+	}, {
+		.reg = PMBUS_VIN_UV_FAULT_LIMIT,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_VOLTAGE_UV_FAULT,
+	}, {
+		.reg = PMBUS_VIN_OV_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_VOLTAGE_OV_WARNING,
+	}, {
+		.reg = PMBUS_VIN_OV_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_VOLTAGE_OV_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_VIN_AVG,
+		.update = true,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_VIN_MIN,
+		.update = true,
+		.attr = "lowest",
+	}, {
+		.reg = PMBUS_VIRT_READ_VIN_MAX,
+		.update = true,
+		.attr = "highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_VIN_HISTORY,
+		.attr = "reset_history",
+	},
+};
+
+static const struct pmbus_limit_attr vmon_limit_attrs[] = {
+	{
+		.reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
+		.attr = "min",
+		.alarm = "min_alarm",
+		.sbit = PB_VOLTAGE_UV_WARNING,
+	}, {
+		.reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_VOLTAGE_UV_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_VOLTAGE_OV_WARNING,
+	}, {
+		.reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_VOLTAGE_OV_FAULT,
+	}
+};
+
+static const struct pmbus_limit_attr vout_limit_attrs[] = {
+	{
+		.reg = PMBUS_VOUT_UV_WARN_LIMIT,
+		.attr = "min",
+		.alarm = "min_alarm",
+		.sbit = PB_VOLTAGE_UV_WARNING,
+	}, {
+		.reg = PMBUS_VOUT_UV_FAULT_LIMIT,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_VOLTAGE_UV_FAULT,
+	}, {
+		.reg = PMBUS_VOUT_OV_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_VOLTAGE_OV_WARNING,
+	}, {
+		.reg = PMBUS_VOUT_OV_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_VOLTAGE_OV_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_VOUT_AVG,
+		.update = true,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_VOUT_MIN,
+		.update = true,
+		.attr = "lowest",
+	}, {
+		.reg = PMBUS_VIRT_READ_VOUT_MAX,
+		.update = true,
+		.attr = "highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_sensor_attr voltage_attributes[] = {
+	{
+		.reg = PMBUS_READ_VIN,
+		.class = PSC_VOLTAGE_IN,
+		.label = "vin",
+		.func = PMBUS_HAVE_VIN,
+		.sfunc = PMBUS_HAVE_STATUS_INPUT,
+		.sbase = PB_STATUS_INPUT_BASE,
+		.gbit = PB_STATUS_VIN_UV,
+		.limit = vin_limit_attrs,
+		.nlimit = ARRAY_SIZE(vin_limit_attrs),
+	}, {
+		.reg = PMBUS_VIRT_READ_VMON,
+		.class = PSC_VOLTAGE_IN,
+		.label = "vmon",
+		.func = PMBUS_HAVE_VMON,
+		.sfunc = PMBUS_HAVE_STATUS_VMON,
+		.sbase = PB_STATUS_VMON_BASE,
+		.limit = vmon_limit_attrs,
+		.nlimit = ARRAY_SIZE(vmon_limit_attrs),
+	}, {
+		.reg = PMBUS_READ_VCAP,
+		.class = PSC_VOLTAGE_IN,
+		.label = "vcap",
+		.func = PMBUS_HAVE_VCAP,
+	}, {
+		.reg = PMBUS_READ_VOUT,
+		.class = PSC_VOLTAGE_OUT,
+		.label = "vout",
+		.paged = true,
+		.func = PMBUS_HAVE_VOUT,
+		.sfunc = PMBUS_HAVE_STATUS_VOUT,
+		.sbase = PB_STATUS_VOUT_BASE,
+		.gbit = PB_STATUS_VOUT_OV,
+		.limit = vout_limit_attrs,
+		.nlimit = ARRAY_SIZE(vout_limit_attrs),
+	}
+};
+
+/* Current attributes */
+
+static const struct pmbus_limit_attr iin_limit_attrs[] = {
+	{
+		.reg = PMBUS_IIN_OC_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_IIN_OC_WARNING,
+	}, {
+		.reg = PMBUS_IIN_OC_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_IIN_OC_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_IIN_AVG,
+		.update = true,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_IIN_MIN,
+		.update = true,
+		.attr = "lowest",
+	}, {
+		.reg = PMBUS_VIRT_READ_IIN_MAX,
+		.update = true,
+		.attr = "highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_IIN_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_limit_attr iout_limit_attrs[] = {
+	{
+		.reg = PMBUS_IOUT_OC_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_IOUT_OC_WARNING,
+	}, {
+		.reg = PMBUS_IOUT_UC_FAULT_LIMIT,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_IOUT_UC_FAULT,
+	}, {
+		.reg = PMBUS_IOUT_OC_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_IOUT_OC_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_IOUT_AVG,
+		.update = true,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_IOUT_MIN,
+		.update = true,
+		.attr = "lowest",
+	}, {
+		.reg = PMBUS_VIRT_READ_IOUT_MAX,
+		.update = true,
+		.attr = "highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_sensor_attr current_attributes[] = {
+	{
+		.reg = PMBUS_READ_IIN,
+		.class = PSC_CURRENT_IN,
+		.label = "iin",
+		.func = PMBUS_HAVE_IIN,
+		.sfunc = PMBUS_HAVE_STATUS_INPUT,
+		.sbase = PB_STATUS_INPUT_BASE,
+		.limit = iin_limit_attrs,
+		.nlimit = ARRAY_SIZE(iin_limit_attrs),
+	}, {
+		.reg = PMBUS_READ_IOUT,
+		.class = PSC_CURRENT_OUT,
+		.label = "iout",
+		.paged = true,
+		.func = PMBUS_HAVE_IOUT,
+		.sfunc = PMBUS_HAVE_STATUS_IOUT,
+		.sbase = PB_STATUS_IOUT_BASE,
+		.gbit = PB_STATUS_IOUT_OC,
+		.limit = iout_limit_attrs,
+		.nlimit = ARRAY_SIZE(iout_limit_attrs),
+	}
+};
+
+/* Power attributes */
+
+static const struct pmbus_limit_attr pin_limit_attrs[] = {
+	{
+		.reg = PMBUS_PIN_OP_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "alarm",
+		.sbit = PB_PIN_OP_WARNING,
+	}, {
+		.reg = PMBUS_VIRT_READ_PIN_AVG,
+		.update = true,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_PIN_MAX,
+		.update = true,
+		.attr = "input_highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_PIN_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_limit_attr pout_limit_attrs[] = {
+	{
+		.reg = PMBUS_POUT_MAX,
+		.attr = "cap",
+		.alarm = "cap_alarm",
+		.sbit = PB_POWER_LIMITING,
+	}, {
+		.reg = PMBUS_POUT_OP_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_POUT_OP_WARNING,
+	}, {
+		.reg = PMBUS_POUT_OP_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_POUT_OP_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_POUT_AVG,
+		.update = true,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_POUT_MAX,
+		.update = true,
+		.attr = "input_highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_POUT_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_sensor_attr power_attributes[] = {
+	{
+		.reg = PMBUS_READ_PIN,
+		.class = PSC_POWER,
+		.label = "pin",
+		.func = PMBUS_HAVE_PIN,
+		.sfunc = PMBUS_HAVE_STATUS_INPUT,
+		.sbase = PB_STATUS_INPUT_BASE,
+		.limit = pin_limit_attrs,
+		.nlimit = ARRAY_SIZE(pin_limit_attrs),
+	}, {
+		.reg = PMBUS_READ_POUT,
+		.class = PSC_POWER,
+		.label = "pout",
+		.paged = true,
+		.func = PMBUS_HAVE_POUT,
+		.sfunc = PMBUS_HAVE_STATUS_IOUT,
+		.sbase = PB_STATUS_IOUT_BASE,
+		.limit = pout_limit_attrs,
+		.nlimit = ARRAY_SIZE(pout_limit_attrs),
+	}
+};
+
+/* Temperature atributes */
+
+static const struct pmbus_limit_attr temp_limit_attrs[] = {
+	{
+		.reg = PMBUS_UT_WARN_LIMIT,
+		.low = true,
+		.attr = "min",
+		.alarm = "min_alarm",
+		.sbit = PB_TEMP_UT_WARNING,
+	}, {
+		.reg = PMBUS_UT_FAULT_LIMIT,
+		.low = true,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_TEMP_UT_FAULT,
+	}, {
+		.reg = PMBUS_OT_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_TEMP_OT_WARNING,
+	}, {
+		.reg = PMBUS_OT_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_TEMP_OT_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_TEMP_MIN,
+		.attr = "lowest",
+	}, {
+		.reg = PMBUS_VIRT_READ_TEMP_AVG,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_TEMP_MAX,
+		.attr = "highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_limit_attr temp_limit_attrs2[] = {
+	{
+		.reg = PMBUS_UT_WARN_LIMIT,
+		.low = true,
+		.attr = "min",
+		.alarm = "min_alarm",
+		.sbit = PB_TEMP_UT_WARNING,
+	}, {
+		.reg = PMBUS_UT_FAULT_LIMIT,
+		.low = true,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_TEMP_UT_FAULT,
+	}, {
+		.reg = PMBUS_OT_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_TEMP_OT_WARNING,
+	}, {
+		.reg = PMBUS_OT_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_TEMP_OT_FAULT,
+	}, {
+		.reg = PMBUS_VIRT_READ_TEMP2_MIN,
+		.attr = "lowest",
+	}, {
+		.reg = PMBUS_VIRT_READ_TEMP2_AVG,
+		.attr = "average",
+	}, {
+		.reg = PMBUS_VIRT_READ_TEMP2_MAX,
+		.attr = "highest",
+	}, {
+		.reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
+		.attr = "reset_history",
+	}
+};
+
+static const struct pmbus_limit_attr temp_limit_attrs3[] = {
+	{
+		.reg = PMBUS_UT_WARN_LIMIT,
+		.low = true,
+		.attr = "min",
+		.alarm = "min_alarm",
+		.sbit = PB_TEMP_UT_WARNING,
+	}, {
+		.reg = PMBUS_UT_FAULT_LIMIT,
+		.low = true,
+		.attr = "lcrit",
+		.alarm = "lcrit_alarm",
+		.sbit = PB_TEMP_UT_FAULT,
+	}, {
+		.reg = PMBUS_OT_WARN_LIMIT,
+		.attr = "max",
+		.alarm = "max_alarm",
+		.sbit = PB_TEMP_OT_WARNING,
+	}, {
+		.reg = PMBUS_OT_FAULT_LIMIT,
+		.attr = "crit",
+		.alarm = "crit_alarm",
+		.sbit = PB_TEMP_OT_FAULT,
+	}
+};
+
+static const struct pmbus_sensor_attr temp_attributes[] = {
+	{
+		.reg = PMBUS_READ_TEMPERATURE_1,
+		.class = PSC_TEMPERATURE,
+		.paged = true,
+		.update = true,
+		.compare = true,
+		.func = PMBUS_HAVE_TEMP,
+		.sfunc = PMBUS_HAVE_STATUS_TEMP,
+		.sbase = PB_STATUS_TEMP_BASE,
+		.gbit = PB_STATUS_TEMPERATURE,
+		.limit = temp_limit_attrs,
+		.nlimit = ARRAY_SIZE(temp_limit_attrs),
+	}, {
+		.reg = PMBUS_READ_TEMPERATURE_2,
+		.class = PSC_TEMPERATURE,
+		.paged = true,
+		.update = true,
+		.compare = true,
+		.func = PMBUS_HAVE_TEMP2,
+		.sfunc = PMBUS_HAVE_STATUS_TEMP,
+		.sbase = PB_STATUS_TEMP_BASE,
+		.gbit = PB_STATUS_TEMPERATURE,
+		.limit = temp_limit_attrs2,
+		.nlimit = ARRAY_SIZE(temp_limit_attrs2),
+	}, {
+		.reg = PMBUS_READ_TEMPERATURE_3,
+		.class = PSC_TEMPERATURE,
+		.paged = true,
+		.update = true,
+		.compare = true,
+		.func = PMBUS_HAVE_TEMP3,
+		.sfunc = PMBUS_HAVE_STATUS_TEMP,
+		.sbase = PB_STATUS_TEMP_BASE,
+		.gbit = PB_STATUS_TEMPERATURE,
+		.limit = temp_limit_attrs3,
+		.nlimit = ARRAY_SIZE(temp_limit_attrs3),
+	}
+};
+
+static const int pmbus_fan_registers[] = {
+	PMBUS_READ_FAN_SPEED_1,
+	PMBUS_READ_FAN_SPEED_2,
+	PMBUS_READ_FAN_SPEED_3,
+	PMBUS_READ_FAN_SPEED_4
+};
+
+static const int pmbus_fan_config_registers[] = {
+	PMBUS_FAN_CONFIG_12,
+	PMBUS_FAN_CONFIG_12,
+	PMBUS_FAN_CONFIG_34,
+	PMBUS_FAN_CONFIG_34
+};
+
+static const int pmbus_fan_status_registers[] = {
+	PMBUS_STATUS_FAN_12,
+	PMBUS_STATUS_FAN_12,
+	PMBUS_STATUS_FAN_34,
+	PMBUS_STATUS_FAN_34
+};
+
+static const u32 pmbus_fan_flags[] = {
+	PMBUS_HAVE_FAN12,
+	PMBUS_HAVE_FAN12,
+	PMBUS_HAVE_FAN34,
+	PMBUS_HAVE_FAN34
+};
+
+static const u32 pmbus_fan_status_flags[] = {
+	PMBUS_HAVE_STATUS_FAN12,
+	PMBUS_HAVE_STATUS_FAN12,
+	PMBUS_HAVE_STATUS_FAN34,
+	PMBUS_HAVE_STATUS_FAN34
+};
+
+/* Fans */
+static int pmbus_add_fan_attributes(struct i2c_client *client,
+				    struct pmbus_data *data)
+{
+	const struct pmbus_driver_info *info = data->info;
+	int index = 1;
+	int page;
+	int ret;
+
+	for (page = 0; page < info->pages; page++) {
+		int f;
+
+		for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
+			int regval;
+
+			if (!(info->func[page] & pmbus_fan_flags[f]))
+				break;
+
+			if (!pmbus_check_word_register(client, page,
+						       pmbus_fan_registers[f]))
+				break;
+
+			/*
+			 * Skip fan if not installed.
+			 * Each fan configuration register covers multiple fans,
+			 * so we have to do some magic.
+			 */
+			regval = _pmbus_read_byte_data(client, page,
+				pmbus_fan_config_registers[f]);
+			if (regval < 0 ||
+			    (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
+				continue;
+
+			if (pmbus_add_sensor(data, "fan", "input", index,
+					     page, pmbus_fan_registers[f],
+					     PSC_FAN, true, true) == NULL)
+				return -ENOMEM;
+
+			/*
+			 * Each fan status register covers multiple fans,
+			 * so we have to do some magic.
+			 */
+			if ((info->func[page] & pmbus_fan_status_flags[f]) &&
+			    pmbus_check_byte_register(client,
+					page, pmbus_fan_status_registers[f])) {
+				int base;
+
+				if (f > 1)	/* fan 3, 4 */
+					base = PB_STATUS_FAN34_BASE + page;
+				else
+					base = PB_STATUS_FAN_BASE + page;
+				ret = pmbus_add_boolean(data, "fan",
+					"alarm", index, NULL, NULL, base,
+					PB_FAN_FAN1_WARNING >> (f & 1));
+				if (ret)
+					return ret;
+				ret = pmbus_add_boolean(data, "fan",
+					"fault", index, NULL, NULL, base,
+					PB_FAN_FAN1_FAULT >> (f & 1));
+				if (ret)
+					return ret;
+			}
+			index++;
+		}
+	}
+	return 0;
+}
+
+static int pmbus_find_attributes(struct i2c_client *client,
+				 struct pmbus_data *data)
+{
+	int ret;
+
+	/* Voltage sensors */
+	ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
+				     ARRAY_SIZE(voltage_attributes));
+	if (ret)
+		return ret;
+
+	/* Current sensors */
+	ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
+				     ARRAY_SIZE(current_attributes));
+	if (ret)
+		return ret;
+
+	/* Power sensors */
+	ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
+				     ARRAY_SIZE(power_attributes));
+	if (ret)
+		return ret;
+
+	/* Temperature sensors */
+	ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
+				     ARRAY_SIZE(temp_attributes));
+	if (ret)
+		return ret;
+
+	/* Fans */
+	ret = pmbus_add_fan_attributes(client, data);
+	return ret;
+}
+
+/*
+ * Identify chip parameters.
+ * This function is called for all chips.
+ */
+static int pmbus_identify_common(struct i2c_client *client,
+				 struct pmbus_data *data, int page)
+{
+	int vout_mode = -1;
+
+	if (pmbus_check_byte_register(client, page, PMBUS_VOUT_MODE))
+		vout_mode = _pmbus_read_byte_data(client, page,
+						  PMBUS_VOUT_MODE);
+	if (vout_mode >= 0 && vout_mode != 0xff) {
+		/*
+		 * Not all chips support the VOUT_MODE command,
+		 * so a failure to read it is not an error.
+		 */
+		switch (vout_mode >> 5) {
+		case 0:	/* linear mode      */
+			if (data->info->format[PSC_VOLTAGE_OUT] != linear)
+				return -ENODEV;
+
+			data->exponent[page] = ((s8)(vout_mode << 3)) >> 3;
+			break;
+		case 1: /* VID mode         */
+			if (data->info->format[PSC_VOLTAGE_OUT] != vid)
+				return -ENODEV;
+			break;
+		case 2:	/* direct mode      */
+			if (data->info->format[PSC_VOLTAGE_OUT] != direct)
+				return -ENODEV;
+			break;
+		default:
+			return -ENODEV;
+		}
+	}
+
+	pmbus_clear_fault_page(client, page);
+	return 0;
+}
+
+static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
+			     struct pmbus_driver_info *info)
+{
+	struct device *dev = &client->dev;
+	int page, ret;
+
+	/*
+	 * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try
+	 * to use PMBUS_STATUS_WORD instead if that is the case.
+	 * Bail out if both registers are not supported.
+	 */
+	data->status_register = PMBUS_STATUS_BYTE;
+	ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
+	if (ret < 0 || ret == 0xff) {
+		data->status_register = PMBUS_STATUS_WORD;
+		ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
+		if (ret < 0 || ret == 0xffff) {
+			dev_err(dev, "PMBus status register not found\n");
+			return -ENODEV;
+		}
+	}
+
+	pmbus_clear_faults(client);
+
+	if (info->identify) {
+		ret = (*info->identify)(client, info);
+		if (ret < 0) {
+			dev_err(dev, "Chip identification failed\n");
+			return ret;
+		}
+	}
+
+	if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
+		dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
+		return -ENODEV;
+	}
+
+	for (page = 0; page < info->pages; page++) {
+		ret = pmbus_identify_common(client, data, page);
+		if (ret < 0) {
+			dev_err(dev, "Failed to identify chip capabilities\n");
+			return ret;
+		}
+	}
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_REGULATOR)
+static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	u8 page = rdev_get_id(rdev);
+	int ret;
+
+	ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
+	if (ret < 0)
+		return ret;
+
+	return !!(ret & PB_OPERATION_CONTROL_ON);
+}
+
+static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	u8 page = rdev_get_id(rdev);
+
+	return pmbus_update_byte_data(client, page, PMBUS_OPERATION,
+				      PB_OPERATION_CONTROL_ON,
+				      enable ? PB_OPERATION_CONTROL_ON : 0);
+}
+
+static int pmbus_regulator_enable(struct regulator_dev *rdev)
+{
+	return _pmbus_regulator_on_off(rdev, 1);
+}
+
+static int pmbus_regulator_disable(struct regulator_dev *rdev)
+{
+	return _pmbus_regulator_on_off(rdev, 0);
+}
+
+struct regulator_ops pmbus_regulator_ops = {
+	.enable = pmbus_regulator_enable,
+	.disable = pmbus_regulator_disable,
+	.is_enabled = pmbus_regulator_is_enabled,
+};
+EXPORT_SYMBOL_GPL(pmbus_regulator_ops);
+
+static int pmbus_regulator_register(struct pmbus_data *data)
+{
+	struct device *dev = data->dev;
+	const struct pmbus_driver_info *info = data->info;
+	const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
+	struct regulator_dev *rdev;
+	int i;
+
+	for (i = 0; i < info->num_regulators; i++) {
+		struct regulator_config config = { };
+
+		config.dev = dev;
+		config.driver_data = data;
+
+		if (pdata && pdata->reg_init_data)
+			config.init_data = &pdata->reg_init_data[i];
+
+		rdev = devm_regulator_register(dev, &info->reg_desc[i],
+					       &config);
+		if (IS_ERR(rdev)) {
+			dev_err(dev, "Failed to register %s regulator\n",
+				info->reg_desc[i].name);
+			return PTR_ERR(rdev);
+		}
+	}
+
+	return 0;
+}
+#else
+static int pmbus_regulator_register(struct pmbus_data *data)
+{
+	return 0;
+}
+#endif
+
+int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
+		   struct pmbus_driver_info *info)
+{
+	struct device *dev = &client->dev;
+	const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
+	struct pmbus_data *data;
+	int ret;
+
+	if (!info)
+		return -ENODEV;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
+				     | I2C_FUNC_SMBUS_BYTE_DATA
+				     | I2C_FUNC_SMBUS_WORD_DATA))
+		return -ENODEV;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->update_lock);
+	data->dev = dev;
+
+	if (pdata)
+		data->flags = pdata->flags;
+	data->info = info;
+
+	ret = pmbus_init_common(client, data, info);
+	if (ret < 0)
+		return ret;
+
+	ret = pmbus_find_attributes(client, data);
+	if (ret)
+		goto out_kfree;
+
+	/*
+	 * If there are no attributes, something is wrong.
+	 * Bail out instead of trying to register nothing.
+	 */
+	if (!data->num_attributes) {
+		dev_err(dev, "No attributes found\n");
+		ret = -ENODEV;
+		goto out_kfree;
+	}
+
+	data->groups[0] = &data->group;
+	data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
+							    data, data->groups);
+	if (IS_ERR(data->hwmon_dev)) {
+		ret = PTR_ERR(data->hwmon_dev);
+		dev_err(dev, "Failed to register hwmon device\n");
+		goto out_kfree;
+	}
+
+	ret = pmbus_regulator_register(data);
+	if (ret)
+		goto out_unregister;
+
+	return 0;
+
+out_unregister:
+	hwmon_device_unregister(data->hwmon_dev);
+out_kfree:
+	kfree(data->group.attrs);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pmbus_do_probe);
+
+int pmbus_do_remove(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	hwmon_device_unregister(data->hwmon_dev);
+	kfree(data->group.attrs);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pmbus_do_remove);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus core driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/tps40422.c b/drivers/hwmon/pmbus/tps40422.c
new file mode 100644
index 000000000..32803825d
--- /dev/null
+++ b/drivers/hwmon/pmbus/tps40422.c
@@ -0,0 +1,64 @@
+/*
+ * Hardware monitoring driver for TI TPS40422
+ *
+ * Copyright (c) 2014 Nokia Solutions and Networks.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info tps40422_info = {
+	.pages = 2,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+	.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP2
+		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP
+		| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+	.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP2
+		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP
+		| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+};
+
+static int tps40422_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	return pmbus_do_probe(client, id, &tps40422_info);
+}
+
+static const struct i2c_device_id tps40422_id[] = {
+	{"tps40422", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, tps40422_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver tps40422_driver = {
+	.driver = {
+		   .name = "tps40422",
+		   },
+	.probe = tps40422_probe,
+	.remove = pmbus_do_remove,
+	.id_table = tps40422_id,
+};
+
+module_i2c_driver(tps40422_driver);
+
+MODULE_AUTHOR("Zhu Laiwen <richard.zhu@nsn.com>");
+MODULE_DESCRIPTION("PMBus driver for TI TPS40422");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
new file mode 100644
index 000000000..fbb1479d3
--- /dev/null
+++ b/drivers/hwmon/pmbus/ucd9000.c
@@ -0,0 +1,246 @@
+/*
+ * Hardware monitoring driver for UCD90xxx Sequencer and System Health
+ * Controller series
+ *
+ * Copyright (C) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c/pmbus.h>
+#include "pmbus.h"
+
+enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
+
+#define UCD9000_MONITOR_CONFIG		0xd5
+#define UCD9000_NUM_PAGES		0xd6
+#define UCD9000_FAN_CONFIG_INDEX	0xe7
+#define UCD9000_FAN_CONFIG		0xe8
+#define UCD9000_DEVICE_ID		0xfd
+
+#define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
+#define UCD9000_MON_PAGE(x)	((x) & 0x0f)
+
+#define UCD9000_MON_VOLTAGE	1
+#define UCD9000_MON_TEMPERATURE	2
+#define UCD9000_MON_CURRENT	3
+#define UCD9000_MON_VOLTAGE_HW	4
+
+#define UCD9000_NUM_FAN		4
+
+struct ucd9000_data {
+	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
+	struct pmbus_driver_info info;
+};
+#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
+
+static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
+{
+	int fan_config = 0;
+	struct ucd9000_data *data
+	  = to_ucd9000_data(pmbus_get_driver_info(client));
+
+	if (data->fan_data[fan][3] & 1)
+		fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */
+
+	/* Pulses/revolution */
+	fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
+
+	return fan_config;
+}
+
+static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	int ret = 0;
+	int fan_config;
+
+	switch (reg) {
+	case PMBUS_FAN_CONFIG_12:
+		if (page > 0)
+			return -ENXIO;
+
+		ret = ucd9000_get_fan_config(client, 0);
+		if (ret < 0)
+			return ret;
+		fan_config = ret << 4;
+		ret = ucd9000_get_fan_config(client, 1);
+		if (ret < 0)
+			return ret;
+		fan_config |= ret;
+		ret = fan_config;
+		break;
+	case PMBUS_FAN_CONFIG_34:
+		if (page > 0)
+			return -ENXIO;
+
+		ret = ucd9000_get_fan_config(client, 2);
+		if (ret < 0)
+			return ret;
+		fan_config = ret << 4;
+		ret = ucd9000_get_fan_config(client, 3);
+		if (ret < 0)
+			return ret;
+		fan_config |= ret;
+		ret = fan_config;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static const struct i2c_device_id ucd9000_id[] = {
+	{"ucd9000", ucd9000},
+	{"ucd90120", ucd90120},
+	{"ucd90124", ucd90124},
+	{"ucd9090", ucd9090},
+	{"ucd90910", ucd90910},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ucd9000_id);
+
+static int ucd9000_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+	struct ucd9000_data *data;
+	struct pmbus_driver_info *info;
+	const struct i2c_device_id *mid;
+	int i, ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_BLOCK_DATA))
+		return -ENODEV;
+
+	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
+					block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read device ID\n");
+		return ret;
+	}
+	block_buffer[ret] = '\0';
+	dev_info(&client->dev, "Device ID %s\n", block_buffer);
+
+	for (mid = ucd9000_id; mid->name[0]; mid++) {
+		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
+			break;
+	}
+	if (!mid->name[0]) {
+		dev_err(&client->dev, "Unsupported device\n");
+		return -ENODEV;
+	}
+
+	if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
+		dev_notice(&client->dev,
+			   "Device mismatch: Configured %s, detected %s\n",
+			   id->name, mid->name);
+
+	data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	info = &data->info;
+
+	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"Failed to read number of active pages\n");
+		return ret;
+	}
+	info->pages = ret;
+	if (!info->pages) {
+		dev_err(&client->dev, "No pages configured\n");
+		return -ENODEV;
+	}
+
+	/* The internal temperature sensor is always active */
+	info->func[0] = PMBUS_HAVE_TEMP;
+
+	/* Everything else is configurable */
+	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
+					block_buffer);
+	if (ret <= 0) {
+		dev_err(&client->dev, "Failed to read configuration data\n");
+		return -ENODEV;
+	}
+	for (i = 0; i < ret; i++) {
+		int page = UCD9000_MON_PAGE(block_buffer[i]);
+
+		if (page >= info->pages)
+			continue;
+
+		switch (UCD9000_MON_TYPE(block_buffer[i])) {
+		case UCD9000_MON_VOLTAGE:
+		case UCD9000_MON_VOLTAGE_HW:
+			info->func[page] |= PMBUS_HAVE_VOUT
+			  | PMBUS_HAVE_STATUS_VOUT;
+			break;
+		case UCD9000_MON_TEMPERATURE:
+			info->func[page] |= PMBUS_HAVE_TEMP2
+			  | PMBUS_HAVE_STATUS_TEMP;
+			break;
+		case UCD9000_MON_CURRENT:
+			info->func[page] |= PMBUS_HAVE_IOUT
+			  | PMBUS_HAVE_STATUS_IOUT;
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* Fan configuration */
+	if (mid->driver_data == ucd90124) {
+		for (i = 0; i < UCD9000_NUM_FAN; i++) {
+			i2c_smbus_write_byte_data(client,
+						  UCD9000_FAN_CONFIG_INDEX, i);
+			ret = i2c_smbus_read_block_data(client,
+							UCD9000_FAN_CONFIG,
+							data->fan_data[i]);
+			if (ret < 0)
+				return ret;
+		}
+		i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
+
+		info->read_byte_data = ucd9000_read_byte_data;
+		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
+		  | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
+	}
+
+	return pmbus_do_probe(client, mid, info);
+}
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ucd9000_driver = {
+	.driver = {
+		.name = "ucd9000",
+	},
+	.probe = ucd9000_probe,
+	.remove = pmbus_do_remove,
+	.id_table = ucd9000_id,
+};
+
+module_i2c_driver(ucd9000_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/ucd9200.c b/drivers/hwmon/pmbus/ucd9200.c
new file mode 100644
index 000000000..033d6aca4
--- /dev/null
+++ b/drivers/hwmon/pmbus/ucd9200.c
@@ -0,0 +1,180 @@
+/*
+ * Hardware monitoring driver for ucd9200 series Digital PWM System Controllers
+ *
+ * Copyright (C) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c/pmbus.h>
+#include "pmbus.h"
+
+#define UCD9200_PHASE_INFO	0xd2
+#define UCD9200_DEVICE_ID	0xfd
+
+enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
+	     ucd9248 };
+
+static const struct i2c_device_id ucd9200_id[] = {
+	{"ucd9200", ucd9200},
+	{"ucd9220", ucd9220},
+	{"ucd9222", ucd9222},
+	{"ucd9224", ucd9224},
+	{"ucd9240", ucd9240},
+	{"ucd9244", ucd9244},
+	{"ucd9246", ucd9246},
+	{"ucd9248", ucd9248},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ucd9200_id);
+
+static int ucd9200_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+	struct pmbus_driver_info *info;
+	const struct i2c_device_id *mid;
+	int i, j, ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_BLOCK_DATA))
+		return -ENODEV;
+
+	ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
+					block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read device ID\n");
+		return ret;
+	}
+	block_buffer[ret] = '\0';
+	dev_info(&client->dev, "Device ID %s\n", block_buffer);
+
+	for (mid = ucd9200_id; mid->name[0]; mid++) {
+		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
+			break;
+	}
+	if (!mid->name[0]) {
+		dev_err(&client->dev, "Unsupported device\n");
+		return -ENODEV;
+	}
+	if (id->driver_data != ucd9200 && id->driver_data != mid->driver_data)
+		dev_notice(&client->dev,
+			   "Device mismatch: Configured %s, detected %s\n",
+			   id->name, mid->name);
+
+	info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
+					block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read phase information\n");
+		return ret;
+	}
+
+	/*
+	 * Calculate number of configured pages (rails) from PHASE_INFO
+	 * register.
+	 * Rails have to be sequential, so we can abort after finding
+	 * the first unconfigured rail.
+	 */
+	info->pages = 0;
+	for (i = 0; i < ret; i++) {
+		if (!block_buffer[i])
+			break;
+		info->pages++;
+	}
+	if (!info->pages) {
+		dev_err(&client->dev, "No rails configured\n");
+		return -ENODEV;
+	}
+	dev_info(&client->dev, "%d rails configured\n", info->pages);
+
+	/*
+	 * Set PHASE registers on all pages to 0xff to ensure that phase
+	 * specific commands will apply to all phases of a given page (rail).
+	 * This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
+	 * READ_IOUT will return the sum of currents of all phases of a rail,
+	 * and READ_TEMPERATURE2 will return the maximum temperature detected
+	 * for the the phases of the rail.
+	 */
+	for (i = 0; i < info->pages; i++) {
+		/*
+		 * Setting PAGE & PHASE fails once in a while for no obvious
+		 * reason, so we need to retry a couple of times.
+		 */
+		for (j = 0; j < 3; j++) {
+			ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
+			if (ret < 0)
+				continue;
+			ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
+							0xff);
+			if (ret < 0)
+				continue;
+			break;
+		}
+		if (ret < 0) {
+			dev_err(&client->dev,
+				"Failed to initialize PHASE registers\n");
+			return ret;
+		}
+	}
+	if (info->pages > 1)
+		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
+
+	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
+			PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
+			PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+			PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+			PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
+			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+
+	for (i = 1; i < info->pages; i++)
+		info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+			PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+			PMBUS_HAVE_POUT |
+			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+
+	/* ucd9240 supports a single fan */
+	if (mid->driver_data == ucd9240)
+		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
+
+	return pmbus_do_probe(client, mid, info);
+}
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ucd9200_driver = {
+	.driver = {
+		.name = "ucd9200",
+	},
+	.probe = ucd9200_probe,
+	.remove = pmbus_do_remove,
+	.id_table = ucd9200_id,
+};
+
+module_i2c_driver(ucd9200_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/zl6100.c b/drivers/hwmon/pmbus/zl6100.c
new file mode 100644
index 000000000..819644121
--- /dev/null
+++ b/drivers/hwmon/pmbus/zl6100.c
@@ -0,0 +1,419 @@
+/*
+ * Hardware monitoring driver for ZL6100 and compatibles
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ * Copyright (c) 2012 Guenter Roeck
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/ktime.h>
+#include <linux/delay.h>
+#include "pmbus.h"
+
+enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
+	     zl9101, zl9117 };
+
+struct zl6100_data {
+	int id;
+	ktime_t access;		/* chip access time */
+	int delay;		/* Delay between chip accesses in uS */
+	struct pmbus_driver_info info;
+};
+
+#define to_zl6100_data(x)  container_of(x, struct zl6100_data, info)
+
+#define ZL6100_MFR_CONFIG		0xd0
+#define ZL6100_DEVICE_ID		0xe4
+
+#define ZL6100_MFR_XTEMP_ENABLE		(1 << 7)
+
+#define MFR_VMON_OV_FAULT_LIMIT		0xf5
+#define MFR_VMON_UV_FAULT_LIMIT		0xf6
+#define MFR_READ_VMON			0xf7
+
+#define VMON_UV_WARNING			(1 << 5)
+#define VMON_OV_WARNING			(1 << 4)
+#define VMON_UV_FAULT			(1 << 1)
+#define VMON_OV_FAULT			(1 << 0)
+
+#define ZL6100_WAIT_TIME		1000	/* uS	*/
+
+static ushort delay = ZL6100_WAIT_TIME;
+module_param(delay, ushort, 0644);
+MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
+
+/* Convert linear sensor value to milli-units */
+static long zl6100_l2d(s16 l)
+{
+	s16 exponent;
+	s32 mantissa;
+	long val;
+
+	exponent = l >> 11;
+	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
+
+	val = mantissa;
+
+	/* scale result to milli-units */
+	val = val * 1000L;
+
+	if (exponent >= 0)
+		val <<= exponent;
+	else
+		val >>= -exponent;
+
+	return val;
+}
+
+#define MAX_MANTISSA	(1023 * 1000)
+#define MIN_MANTISSA	(511 * 1000)
+
+static u16 zl6100_d2l(long val)
+{
+	s16 exponent = 0, mantissa;
+	bool negative = false;
+
+	/* simple case */
+	if (val == 0)
+		return 0;
+
+	if (val < 0) {
+		negative = true;
+		val = -val;
+	}
+
+	/* Reduce large mantissa until it fits into 10 bit */
+	while (val >= MAX_MANTISSA && exponent < 15) {
+		exponent++;
+		val >>= 1;
+	}
+	/* Increase small mantissa to improve precision */
+	while (val < MIN_MANTISSA && exponent > -15) {
+		exponent--;
+		val <<= 1;
+	}
+
+	/* Convert mantissa from milli-units to units */
+	mantissa = DIV_ROUND_CLOSEST(val, 1000);
+
+	/* Ensure that resulting number is within range */
+	if (mantissa > 0x3ff)
+		mantissa = 0x3ff;
+
+	/* restore sign */
+	if (negative)
+		mantissa = -mantissa;
+
+	/* Convert to 5 bit exponent, 11 bit mantissa */
+	return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
+}
+
+/* Some chips need a delay between accesses */
+static inline void zl6100_wait(const struct zl6100_data *data)
+{
+	if (data->delay) {
+		s64 delta = ktime_us_delta(ktime_get(), data->access);
+		if (delta < data->delay)
+			udelay(data->delay - delta);
+	}
+}
+
+static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret, vreg;
+
+	if (page > 0)
+		return -ENXIO;
+
+	if (data->id == zl2005) {
+		/*
+		 * Limit register detection is not reliable on ZL2005.
+		 * Make sure registers are not erroneously detected.
+		 */
+		switch (reg) {
+		case PMBUS_VOUT_OV_WARN_LIMIT:
+		case PMBUS_VOUT_UV_WARN_LIMIT:
+		case PMBUS_IOUT_OC_WARN_LIMIT:
+			return -ENXIO;
+		}
+	}
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VMON:
+		vreg = MFR_READ_VMON;
+		break;
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
+		vreg = MFR_VMON_OV_FAULT_LIMIT;
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
+		vreg = MFR_VMON_UV_FAULT_LIMIT;
+		break;
+	default:
+		if (reg >= PMBUS_VIRT_BASE)
+			return -ENXIO;
+		vreg = reg;
+		break;
+	}
+
+	zl6100_wait(data);
+	ret = pmbus_read_word_data(client, page, vreg);
+	data->access = ktime_get();
+	if (ret < 0)
+		return ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+		ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+		ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
+		break;
+	}
+
+	return ret;
+}
+
+static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret, status;
+
+	if (page > 0)
+		return -ENXIO;
+
+	zl6100_wait(data);
+
+	switch (reg) {
+	case PMBUS_VIRT_STATUS_VMON:
+		ret = pmbus_read_byte_data(client, 0,
+					   PMBUS_STATUS_MFR_SPECIFIC);
+		if (ret < 0)
+			break;
+
+		status = 0;
+		if (ret & VMON_UV_WARNING)
+			status |= PB_VOLTAGE_UV_WARNING;
+		if (ret & VMON_OV_WARNING)
+			status |= PB_VOLTAGE_OV_WARNING;
+		if (ret & VMON_UV_FAULT)
+			status |= PB_VOLTAGE_UV_FAULT;
+		if (ret & VMON_OV_FAULT)
+			status |= PB_VOLTAGE_OV_FAULT;
+		ret = status;
+		break;
+	default:
+		ret = pmbus_read_byte_data(client, page, reg);
+		break;
+	}
+	data->access = ktime_get();
+
+	return ret;
+}
+
+static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
+				  u16 word)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret, vreg;
+
+	if (page > 0)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+		word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
+		vreg = MFR_VMON_OV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
+		vreg = MFR_VMON_OV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+		word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
+		vreg = MFR_VMON_UV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
+		vreg = MFR_VMON_UV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	default:
+		if (reg >= PMBUS_VIRT_BASE)
+			return -ENXIO;
+		vreg = reg;
+	}
+
+	zl6100_wait(data);
+	ret = pmbus_write_word_data(client, page, vreg, word);
+	data->access = ktime_get();
+
+	return ret;
+}
+
+static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret;
+
+	if (page > 0)
+		return -ENXIO;
+
+	zl6100_wait(data);
+	ret = pmbus_write_byte(client, page, value);
+	data->access = ktime_get();
+
+	return ret;
+}
+
+static const struct i2c_device_id zl6100_id[] = {
+	{"bmr450", zl2005},
+	{"bmr451", zl2005},
+	{"bmr462", zl2008},
+	{"bmr463", zl2008},
+	{"bmr464", zl2008},
+	{"zl2004", zl2004},
+	{"zl2005", zl2005},
+	{"zl2006", zl2006},
+	{"zl2008", zl2008},
+	{"zl2105", zl2105},
+	{"zl2106", zl2106},
+	{"zl6100", zl6100},
+	{"zl6105", zl6105},
+	{"zl9101", zl9101},
+	{"zl9117", zl9117},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, zl6100_id);
+
+static int zl6100_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct zl6100_data *data;
+	struct pmbus_driver_info *info;
+	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
+	const struct i2c_device_id *mid;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_WORD_DATA
+				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+		return -ENODEV;
+
+	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
+					device_id);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read device ID\n");
+		return ret;
+	}
+	device_id[ret] = '\0';
+	dev_info(&client->dev, "Device ID %s\n", device_id);
+
+	mid = NULL;
+	for (mid = zl6100_id; mid->name[0]; mid++) {
+		if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
+			break;
+	}
+	if (!mid->name[0]) {
+		dev_err(&client->dev, "Unsupported device\n");
+		return -ENODEV;
+	}
+	if (id->driver_data != mid->driver_data)
+		dev_notice(&client->dev,
+			   "Device mismatch: Configured %s, detected %s\n",
+			   id->name, mid->name);
+
+	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = mid->driver_data;
+
+	/*
+	 * According to information from the chip vendor, all currently
+	 * supported chips are known to require a wait time between I2C
+	 * accesses.
+	 */
+	data->delay = delay;
+
+	/*
+	 * Since there was a direct I2C device access above, wait before
+	 * accessing the chip again.
+	 */
+	data->access = ktime_get();
+	zl6100_wait(data);
+
+	info = &data->info;
+
+	info->pages = 1;
+	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+	  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+	  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+
+	/*
+	 * ZL2004, ZL9101M, and ZL9117M support monitoring an extra voltage
+	 * (VMON for ZL2004, VDRV for ZL9101M and ZL9117M). Report it as vmon.
+	 */
+	if (data->id == zl2004 || data->id == zl9101 || data->id == zl9117)
+		info->func[0] |= PMBUS_HAVE_VMON | PMBUS_HAVE_STATUS_VMON;
+
+	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
+	if (ret < 0)
+		return ret;
+
+	if (ret & ZL6100_MFR_XTEMP_ENABLE)
+		info->func[0] |= PMBUS_HAVE_TEMP2;
+
+	data->access = ktime_get();
+	zl6100_wait(data);
+
+	info->read_word_data = zl6100_read_word_data;
+	info->read_byte_data = zl6100_read_byte_data;
+	info->write_word_data = zl6100_write_word_data;
+	info->write_byte = zl6100_write_byte;
+
+	return pmbus_do_probe(client, mid, info);
+}
+
+static struct i2c_driver zl6100_driver = {
+	.driver = {
+		   .name = "zl6100",
+		   },
+	.probe = zl6100_probe,
+	.remove = pmbus_do_remove,
+	.id_table = zl6100_id,
+};
+
+module_i2c_driver(zl6100_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
+MODULE_LICENSE("GPL");