Initial import

1 files changed, 327 insertions, 0 deletions

diff --git a/drivers/hwmon/max6642.c b/drivers/hwmon/max6642.c
new file mode 100644
index 000000000..6520bc51d
--- /dev/null
+++ b/drivers/hwmon/max6642.c
@@ -0,0 +1,327 @@
+/*
+ * Driver for +/-1 degree C, SMBus-Compatible Remote/Local Temperature Sensor
+ * with Overtemperature Alarm
+ *
+ * Copyright (C) 2011 AppearTV AS
+ *
+ * Derived from:
+ *
+ *  Based on the max1619 driver.
+ *  Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
+ *                          Jean Delvare <jdelvare@suse.de>
+ *
+ * The MAX6642 is a sensor chip made by Maxim.
+ * It reports up to two temperatures (its own plus up to
+ * one external one). Complete datasheet can be
+ * obtained from Maxim's website at:
+ *   http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
+ *
+ * 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>
+#include <linux/sysfs.h>
+
+static const unsigned short normal_i2c[] = {
+	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
+
+/*
+ * The MAX6642 registers
+ */
+
+#define MAX6642_REG_R_MAN_ID		0xFE
+#define MAX6642_REG_R_CONFIG		0x03
+#define MAX6642_REG_W_CONFIG		0x09
+#define MAX6642_REG_R_STATUS		0x02
+#define MAX6642_REG_R_LOCAL_TEMP	0x00
+#define MAX6642_REG_R_LOCAL_TEMPL	0x11
+#define MAX6642_REG_R_LOCAL_HIGH	0x05
+#define MAX6642_REG_W_LOCAL_HIGH	0x0B
+#define MAX6642_REG_R_REMOTE_TEMP	0x01
+#define MAX6642_REG_R_REMOTE_TEMPL	0x10
+#define MAX6642_REG_R_REMOTE_HIGH	0x07
+#define MAX6642_REG_W_REMOTE_HIGH	0x0D
+
+/*
+ * Conversions
+ */
+
+static int temp_from_reg10(int val)
+{
+	return val * 250;
+}
+
+static int temp_from_reg(int val)
+{
+	return val * 1000;
+}
+
+static int temp_to_reg(int val)
+{
+	return val / 1000;
+}
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct max6642_data {
+	struct i2c_client *client;
+	struct mutex update_lock;
+	bool valid; /* zero until following fields are valid */
+	unsigned long last_updated; /* in jiffies */
+
+	/* registers values */
+	u16 temp_input[2]; /* local/remote */
+	u16 temp_high[2]; /* local/remote */
+	u8 alarms;
+};
+
+/*
+ * Real code
+ */
+
+static void max6642_init_client(struct max6642_data *data,
+				struct i2c_client *client)
+{
+	u8 config;
+
+	/*
+	 * Start the conversions.
+	 */
+	config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
+	if (config & 0x40)
+		i2c_smbus_write_byte_data(client, MAX6642_REG_W_CONFIG,
+					  config & 0xBF); /* run */
+
+	data->temp_high[0] = i2c_smbus_read_byte_data(client,
+				MAX6642_REG_R_LOCAL_HIGH);
+	data->temp_high[1] = i2c_smbus_read_byte_data(client,
+				MAX6642_REG_R_REMOTE_HIGH);
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max6642_detect(struct i2c_client *client,
+			  struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	u8 reg_config, reg_status, man_id;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	/* identification */
+	man_id = i2c_smbus_read_byte_data(client, MAX6642_REG_R_MAN_ID);
+	if (man_id != 0x4D)
+		return -ENODEV;
+
+	/* sanity check */
+	if (i2c_smbus_read_byte_data(client, 0x04) != 0x4D
+	    || i2c_smbus_read_byte_data(client, 0x06) != 0x4D
+	    || i2c_smbus_read_byte_data(client, 0xff) != 0x4D)
+		return -ENODEV;
+
+	/*
+	 * We read the config and status register, the 4 lower bits in the
+	 * config register should be zero and bit 5, 3, 1 and 0 should be
+	 * zero in the status register.
+	 */
+	reg_config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
+	if ((reg_config & 0x0f) != 0x00)
+		return -ENODEV;
+
+	/* in between, another round of sanity checks */
+	if (i2c_smbus_read_byte_data(client, 0x04) != reg_config
+	    || i2c_smbus_read_byte_data(client, 0x06) != reg_config
+	    || i2c_smbus_read_byte_data(client, 0xff) != reg_config)
+		return -ENODEV;
+
+	reg_status = i2c_smbus_read_byte_data(client, MAX6642_REG_R_STATUS);
+	if ((reg_status & 0x2b) != 0x00)
+		return -ENODEV;
+
+	strlcpy(info->type, "max6642", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static struct max6642_data *max6642_update_device(struct device *dev)
+{
+	struct max6642_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	u16 val, tmp;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+		dev_dbg(dev, "Updating max6642 data.\n");
+		val = i2c_smbus_read_byte_data(client,
+					MAX6642_REG_R_LOCAL_TEMPL);
+		tmp = (val >> 6) & 3;
+		val = i2c_smbus_read_byte_data(client,
+					MAX6642_REG_R_LOCAL_TEMP);
+		val = (val << 2) | tmp;
+		data->temp_input[0] = val;
+		val = i2c_smbus_read_byte_data(client,
+					MAX6642_REG_R_REMOTE_TEMPL);
+		tmp = (val >> 6) & 3;
+		val = i2c_smbus_read_byte_data(client,
+					MAX6642_REG_R_REMOTE_TEMP);
+		val = (val << 2) | tmp;
+		data->temp_input[1] = val;
+		data->alarms = i2c_smbus_read_byte_data(client,
+					MAX6642_REG_R_STATUS);
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_temp_max10(struct device *dev,
+			       struct device_attribute *dev_attr, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+	struct max6642_data *data = max6642_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		       temp_from_reg10(data->temp_input[attr->index]));
+}
+
+static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
+	struct max6642_data *data = max6642_update_device(dev);
+
+	return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
+}
+
+static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
+	struct max6642_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err < 0)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->temp_high[attr2->nr] = clamp_val(temp_to_reg(val), 0, 255);
+	i2c_smbus_write_byte_data(data->client, attr2->index,
+				  data->temp_high[attr2->nr]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	int bitnr = to_sensor_dev_attr(attr)->index;
+	struct max6642_data *data = max6642_update_device(dev);
+	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_max10, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_max10, NULL, 1);
+static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
+			    set_temp_max, 0, MAX6642_REG_W_LOCAL_HIGH);
+static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
+			    set_temp_max, 1, MAX6642_REG_W_REMOTE_HIGH);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
+
+static struct attribute *max6642_attrs[] = {
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp2_max.dev_attr.attr,
+
+	&sensor_dev_attr_temp2_fault.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(max6642);
+
+static int max6642_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct max6642_data *data;
+	struct device *hwmon_dev;
+
+	data = devm_kzalloc(dev, sizeof(struct max6642_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	mutex_init(&data->update_lock);
+
+	/* Initialize the MAX6642 chip */
+	max6642_init_client(data, client);
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
+							   client->name, data,
+							   max6642_groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static const struct i2c_device_id max6642_id[] = {
+	{ "max6642", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max6642_id);
+
+static struct i2c_driver max6642_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "max6642",
+	},
+	.probe		= max6642_probe,
+	.id_table	= max6642_id,
+	.detect		= max6642_detect,
+	.address_list	= normal_i2c,
+};
+
+module_i2c_driver(max6642_driver);
+
+MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
+MODULE_DESCRIPTION("MAX6642 sensor driver");
+MODULE_LICENSE("GPL");