Initial import

1 files changed, 506 insertions, 0 deletions

diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c
new file mode 100644
index 000000000..1fdcc3e70
--- /dev/null
+++ b/drivers/hwmon/adm1021.c
@@ -0,0 +1,506 @@
+/*
+ * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
+ *	       monitoring
+ * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
+ *			     Philip Edelbrock <phil@netroedge.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+
+/* Addresses to scan */
+static const unsigned short normal_i2c[] = {
+	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
+
+enum chips {
+	adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
+
+/* adm1021 constants specified below */
+
+/* The adm1021 registers */
+/* Read-only */
+/* For nr in 0-1 */
+#define ADM1021_REG_TEMP(nr)		(nr)
+#define ADM1021_REG_STATUS		0x02
+/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
+#define ADM1021_REG_MAN_ID		0xFE
+/* ADM1021 = 0x0X, ADM1023 = 0x3X */
+#define ADM1021_REG_DEV_ID		0xFF
+/* These use different addresses for reading/writing */
+#define ADM1021_REG_CONFIG_R		0x03
+#define ADM1021_REG_CONFIG_W		0x09
+#define ADM1021_REG_CONV_RATE_R		0x04
+#define ADM1021_REG_CONV_RATE_W		0x0A
+/* These are for the ADM1023's additional precision on the remote temp sensor */
+#define ADM1023_REG_REM_TEMP_PREC	0x10
+#define ADM1023_REG_REM_OFFSET		0x11
+#define ADM1023_REG_REM_OFFSET_PREC	0x12
+#define ADM1023_REG_REM_TOS_PREC	0x13
+#define ADM1023_REG_REM_THYST_PREC	0x14
+/* limits */
+/* For nr in 0-1 */
+#define ADM1021_REG_TOS_R(nr)		(0x05 + 2 * (nr))
+#define ADM1021_REG_TOS_W(nr)		(0x0B + 2 * (nr))
+#define ADM1021_REG_THYST_R(nr)		(0x06 + 2 * (nr))
+#define ADM1021_REG_THYST_W(nr)		(0x0C + 2 * (nr))
+/* write-only */
+#define ADM1021_REG_ONESHOT		0x0F
+
+/* Initial values */
+
+/*
+ * Note: Even though I left the low and high limits named os and hyst,
+ * they don't quite work like a thermostat the way the LM75 does.  I.e.,
+ * a lower temp than THYST actually triggers an alarm instead of
+ * clearing it.  Weird, ey?   --Phil
+ */
+
+/* Each client has this additional data */
+struct adm1021_data {
+	struct i2c_client *client;
+	enum chips type;
+
+	const struct attribute_group *groups[3];
+
+	struct mutex update_lock;
+	char valid;		/* !=0 if following fields are valid */
+	char low_power;		/* !=0 if device in low power mode */
+	unsigned long last_updated;	/* In jiffies */
+
+	int temp_max[2];		/* Register values */
+	int temp_min[2];
+	int temp[2];
+	u8 alarms;
+	/* Special values for ADM1023 only */
+	u8 remote_temp_offset;
+	u8 remote_temp_offset_prec;
+};
+
+/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
+static bool read_only;
+
+static struct adm1021_data *adm1021_update_device(struct device *dev)
+{
+	struct adm1021_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+	    || !data->valid) {
+		int i;
+
+		dev_dbg(dev, "Starting adm1021 update\n");
+
+		for (i = 0; i < 2; i++) {
+			data->temp[i] = 1000 *
+				(s8) i2c_smbus_read_byte_data(
+					client, ADM1021_REG_TEMP(i));
+			data->temp_max[i] = 1000 *
+				(s8) i2c_smbus_read_byte_data(
+					client, ADM1021_REG_TOS_R(i));
+			if (data->type != lm84) {
+				data->temp_min[i] = 1000 *
+				  (s8) i2c_smbus_read_byte_data(client,
+							ADM1021_REG_THYST_R(i));
+			}
+		}
+		data->alarms = i2c_smbus_read_byte_data(client,
+						ADM1021_REG_STATUS) & 0x7c;
+		if (data->type == adm1023) {
+			/*
+			 * The ADM1023 provides 3 extra bits of precision for
+			 * the remote sensor in extra registers.
+			 */
+			data->temp[1] += 125 * (i2c_smbus_read_byte_data(
+				client, ADM1023_REG_REM_TEMP_PREC) >> 5);
+			data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
+				client, ADM1023_REG_REM_TOS_PREC) >> 5);
+			data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
+				client, ADM1023_REG_REM_THYST_PREC) >> 5);
+			data->remote_temp_offset =
+				i2c_smbus_read_byte_data(client,
+						ADM1023_REG_REM_OFFSET);
+			data->remote_temp_offset_prec =
+				i2c_smbus_read_byte_data(client,
+						ADM1023_REG_REM_OFFSET_PREC);
+		}
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+static ssize_t show_temp(struct device *dev,
+			 struct device_attribute *devattr, char *buf)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct adm1021_data *data = adm1021_update_device(dev);
+
+	return sprintf(buf, "%d\n", data->temp[index]);
+}
+
+static ssize_t show_temp_max(struct device *dev,
+			     struct device_attribute *devattr, char *buf)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct adm1021_data *data = adm1021_update_device(dev);
+
+	return sprintf(buf, "%d\n", data->temp_max[index]);
+}
+
+static ssize_t show_temp_min(struct device *dev,
+			     struct device_attribute *devattr, char *buf)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct adm1021_data *data = adm1021_update_device(dev);
+
+	return sprintf(buf, "%d\n", data->temp_min[index]);
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	int index = to_sensor_dev_attr(attr)->index;
+	struct adm1021_data *data = adm1021_update_device(dev);
+	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
+}
+
+static ssize_t show_alarms(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct adm1021_data *data = adm1021_update_device(dev);
+	return sprintf(buf, "%u\n", data->alarms);
+}
+
+static ssize_t set_temp_max(struct device *dev,
+			    struct device_attribute *devattr,
+			    const char *buf, size_t count)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct adm1021_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	long temp;
+	int reg_val, err;
+
+	err = kstrtol(buf, 10, &temp);
+	if (err)
+		return err;
+	temp /= 1000;
+
+	mutex_lock(&data->update_lock);
+	reg_val = clamp_val(temp, -128, 127);
+	data->temp_max[index] = reg_val * 1000;
+	if (!read_only)
+		i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
+					  reg_val);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+static ssize_t set_temp_min(struct device *dev,
+			    struct device_attribute *devattr,
+			    const char *buf, size_t count)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct adm1021_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	long temp;
+	int reg_val, err;
+
+	err = kstrtol(buf, 10, &temp);
+	if (err)
+		return err;
+	temp /= 1000;
+
+	mutex_lock(&data->update_lock);
+	reg_val = clamp_val(temp, -128, 127);
+	data->temp_min[index] = reg_val * 1000;
+	if (!read_only)
+		i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
+					  reg_val);
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+static ssize_t show_low_power(struct device *dev,
+			      struct device_attribute *devattr, char *buf)
+{
+	struct adm1021_data *data = adm1021_update_device(dev);
+	return sprintf(buf, "%d\n", data->low_power);
+}
+
+static ssize_t set_low_power(struct device *dev,
+			     struct device_attribute *devattr,
+			     const char *buf, size_t count)
+{
+	struct adm1021_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	char low_power;
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+	low_power = val != 0;
+
+	mutex_lock(&data->update_lock);
+	if (low_power != data->low_power) {
+		int config = i2c_smbus_read_byte_data(
+			client, ADM1021_REG_CONFIG_R);
+		data->low_power = low_power;
+		i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
+			(config & 0xBF) | (low_power << 6));
+	}
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
+			  set_temp_max, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
+			  set_temp_min, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
+			  set_temp_max, 1);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
+			  set_temp_min, 1);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
+
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power);
+
+static struct attribute *adm1021_attributes[] = {
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_max.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_fault.dev_attr.attr,
+	&dev_attr_alarms.attr,
+	&dev_attr_low_power.attr,
+	NULL
+};
+
+static const struct attribute_group adm1021_group = {
+	.attrs = adm1021_attributes,
+};
+
+static struct attribute *adm1021_min_attributes[] = {
+	&sensor_dev_attr_temp1_min.dev_attr.attr,
+	&sensor_dev_attr_temp2_min.dev_attr.attr,
+	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group adm1021_min_group = {
+	.attrs = adm1021_min_attributes,
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int adm1021_detect(struct i2c_client *client,
+			  struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	const char *type_name;
+	int conv_rate, status, config, man_id, dev_id;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+		pr_debug("detect failed, smbus byte data not supported!\n");
+		return -ENODEV;
+	}
+
+	status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
+	conv_rate = i2c_smbus_read_byte_data(client,
+					     ADM1021_REG_CONV_RATE_R);
+	config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
+
+	/* Check unused bits */
+	if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
+		pr_debug("detect failed, chip not detected!\n");
+		return -ENODEV;
+	}
+
+	/* Determine the chip type. */
+	man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
+	dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
+
+	if (man_id < 0 || dev_id < 0)
+		return -ENODEV;
+
+	if (man_id == 0x4d && dev_id == 0x01)
+		type_name = "max1617a";
+	else if (man_id == 0x41) {
+		if ((dev_id & 0xF0) == 0x30)
+			type_name = "adm1023";
+		else if ((dev_id & 0xF0) == 0x00)
+			type_name = "adm1021";
+		else
+			return -ENODEV;
+	} else if (man_id == 0x49)
+		type_name = "thmc10";
+	else if (man_id == 0x23)
+		type_name = "gl523sm";
+	else if (man_id == 0x54)
+		type_name = "mc1066";
+	else {
+		int lte, rte, lhi, rhi, llo, rlo;
+
+		/* extra checks for LM84 and MAX1617 to avoid misdetections */
+
+		llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
+		rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
+
+		/* fail if any of the additional register reads failed */
+		if (llo < 0 || rlo < 0)
+			return -ENODEV;
+
+		lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
+		rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
+		lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
+		rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
+
+		/*
+		 * Fail for negative temperatures and negative high limits.
+		 * This check also catches read errors on the tested registers.
+		 */
+		if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
+			return -ENODEV;
+
+		/* fail if all registers hold the same value */
+		if (lte == rte && lte == lhi && lte == rhi && lte == llo
+		    && lte == rlo)
+			return -ENODEV;
+
+		/*
+		 * LM84 Mfr ID is in a different place,
+		 * and it has more unused bits.
+		 */
+		if (conv_rate == 0x00
+		    && (config & 0x7F) == 0x00
+		    && (status & 0xAB) == 0x00) {
+			type_name = "lm84";
+		} else {
+			/* fail if low limits are larger than high limits */
+			if ((s8)llo > lhi || (s8)rlo > rhi)
+				return -ENODEV;
+			type_name = "max1617";
+		}
+	}
+
+	pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
+		 type_name, i2c_adapter_id(adapter), client->addr);
+	strlcpy(info->type, type_name, I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static void adm1021_init_client(struct i2c_client *client)
+{
+	/* Enable ADC and disable suspend mode */
+	i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
+		i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
+	/* Set Conversion rate to 1/sec (this can be tinkered with) */
+	i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
+}
+
+static int adm1021_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct adm1021_data *data;
+	struct device *hwmon_dev;
+
+	data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	data->type = id->driver_data;
+	mutex_init(&data->update_lock);
+
+	/* Initialize the ADM1021 chip */
+	if (data->type != lm84 && !read_only)
+		adm1021_init_client(client);
+
+	data->groups[0] = &adm1021_group;
+	if (data->type != lm84)
+		data->groups[1] = &adm1021_min_group;
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+							   data, data->groups);
+
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id adm1021_id[] = {
+	{ "adm1021", adm1021 },
+	{ "adm1023", adm1023 },
+	{ "max1617", max1617 },
+	{ "max1617a", max1617a },
+	{ "thmc10", thmc10 },
+	{ "lm84", lm84 },
+	{ "gl523sm", gl523sm },
+	{ "mc1066", mc1066 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, adm1021_id);
+
+static struct i2c_driver adm1021_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "adm1021",
+	},
+	.probe		= adm1021_probe,
+	.id_table	= adm1021_id,
+	.detect		= adm1021_detect,
+	.address_list	= normal_i2c,
+};
+
+module_i2c_driver(adm1021_driver);
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
+		"Philip Edelbrock <phil@netroedge.com>");
+MODULE_DESCRIPTION("adm1021 driver");
+MODULE_LICENSE("GPL");
+
+module_param(read_only, bool, 0);
+MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");