[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hwmon / adm1021.c

/*
 * 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 device *hwmon_dev;
	enum chips type;

	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;
};

static int adm1021_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int adm1021_detect(struct i2c_client *client,
			  struct i2c_board_info *info);
static void adm1021_init_client(struct i2c_client *client);
static int adm1021_remove(struct i2c_client *client);
static struct adm1021_data *adm1021_update_device(struct device *dev);

/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
static bool read_only;


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);

/* This is the driver that will be inserted */
static struct i2c_driver adm1021_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "adm1021",
	},
	.probe		= adm1021_probe,
	.remove		= adm1021_remove,
	.id_table	= adm1021_id,
	.detect		= adm1021_detect,
	.address_list	= normal_i2c,
};

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 i2c_client *client = to_i2c_client(dev);
	struct adm1021_data *data = i2c_get_clientdata(client);
	long temp;
	int err;

	err = kstrtol(buf, 10, &temp);
	if (err)
		return err;
	temp /= 1000;

	mutex_lock(&data->update_lock);
	data->temp_max[index] = clamp_val(temp, -128, 127);
	if (!read_only)
		i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
					  data->temp_max[index]);
	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 i2c_client *client = to_i2c_client(dev);
	struct adm1021_data *data = i2c_get_clientdata(client);
	long temp;
	int err;

	err = kstrtol(buf, 10, &temp);
	if (err)
		return err;
	temp /= 1000;

	mutex_lock(&data->update_lock);
	data->temp_min[index] = clamp_val(temp, -128, 127);
	if (!read_only)
		i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
					  data->temp_min[index]);
	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 i2c_client *client = to_i2c_client(dev);
	struct adm1021_data *data = i2c_get_clientdata(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_min.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_min_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,
};

/* 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 int adm1021_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct adm1021_data *data;
	int err;

	data = devm_kzalloc(&client->dev, sizeof(struct adm1021_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(client, data);
	data->type = id->driver_data;
	mutex_init(&data->update_lock);

	/* Initialize the ADM1021 chip */
	if (data->type != lm84 && !read_only)
		adm1021_init_client(client);

	/* Register sysfs hooks */
	err = sysfs_create_group(&client->dev.kobj, &adm1021_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto error;
	}

	return 0;

error:
	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
	return err;
}

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_remove(struct i2c_client *client)
{
	struct adm1021_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &adm1021_group);

	return 0;
}

static struct adm1021_data *adm1021_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1021_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		int i;

		dev_dbg(&client->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));
			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;
}

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");
Commit	Line	Data
1da177e4	1	/*
21d2a8f1 GR	2	* adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
	4	* Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
	5	* Philip Edelbrock <phil@netroedge.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
1da177e4	21
1da177e4 LT	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24	#include <linux/slab.h>
	25	#include <linux/jiffies.h>
	26	#include <linux/i2c.h>
943b0830	27	#include <linux/hwmon.h>
a8d6646e	28	#include <linux/hwmon-sysfs.h>
943b0830	29	#include <linux/err.h>
9a61bf63	30	#include <linux/mutex.h>
1da177e4 LT	31
	32
	33	/* Addresses to scan */
25e9c86d MH	34	static const unsigned short normal_i2c[] = {
25e9c86d MH	35	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	36
e5e9f44c JD	37	enum chips {
e5e9f44c JD	38	adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
1da177e4 LT	39
	40	/* adm1021 constants specified below */
	41
	42	/* The adm1021 registers */
	43	/* Read-only */
a8d6646e KH	44	/* For nr in 0-1 */
a8d6646e KH	45	#define ADM1021_REG_TEMP(nr) (nr)
1da177e4	46	#define ADM1021_REG_STATUS 0x02
c83c41e4 KH	47	/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
	48	#define ADM1021_REG_MAN_ID 0xFE
	49	/* ADM1021 = 0x0X, ADM1023 = 0x3X */
	50	#define ADM1021_REG_DEV_ID 0xFF
1da177e4 LT	51	/* These use different addresses for reading/writing */
	52	#define ADM1021_REG_CONFIG_R 0x03
	53	#define ADM1021_REG_CONFIG_W 0x09
	54	#define ADM1021_REG_CONV_RATE_R 0x04
	55	#define ADM1021_REG_CONV_RATE_W 0x0A
	56	/* These are for the ADM1023's additional precision on the remote temp sensor */
c83c41e4 KH	57	#define ADM1023_REG_REM_TEMP_PREC 0x10
	58	#define ADM1023_REG_REM_OFFSET 0x11
	59	#define ADM1023_REG_REM_OFFSET_PREC 0x12
	60	#define ADM1023_REG_REM_TOS_PREC 0x13
	61	#define ADM1023_REG_REM_THYST_PREC 0x14
1da177e4	62	/* limits */
a8d6646e KH	63	/* For nr in 0-1 */
	64	#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
	65	#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
	66	#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
	67	#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
1da177e4 LT	68	/* write-only */
	69	#define ADM1021_REG_ONESHOT 0x0F
	70
1da177e4 LT	71	/* Initial values */
1da177e4 LT	72
21d2a8f1 GR	73	/*
	74	* Note: Even though I left the low and high limits named os and hyst,
	75	* they don't quite work like a thermostat the way the LM75 does. I.e.,
	76	* a lower temp than THYST actually triggers an alarm instead of
	77	* clearing it. Weird, ey? --Phil
	78	*/
1da177e4 LT	79
	80	/* Each client has this additional data */
	81	struct adm1021_data {
1beeffe4	82	struct device *hwmon_dev;
1da177e4 LT	83	enum chips type;
1da177e4 LT	84
9a61bf63	85	struct mutex update_lock;
1da177e4	86	char valid; /* !=0 if following fields are valid */
905ffdc3	87	char low_power; /* !=0 if device in low power mode */
1da177e4 LT	88	unsigned long last_updated; /* In jiffies */
1da177e4 LT	89
f2668895 MA	90	int temp_max[2]; /* Register values */
	91	int temp_min[2];
	92	int temp[2];
a8d6646e KH	93	u8 alarms;
a8d6646e KH	94	/* Special values for ADM1023 only */
a8d6646e KH	95	u8 remote_temp_offset;
a8d6646e KH	96	u8 remote_temp_offset_prec;
1da177e4 LT	97	};
1da177e4 LT	98
65817ed8 JD	99	static int adm1021_probe(struct i2c_client *client,
65817ed8 JD	100	const struct i2c_device_id *id);
310ec792	101	static int adm1021_detect(struct i2c_client *client,
65817ed8	102	struct i2c_board_info *info);
1da177e4	103	static void adm1021_init_client(struct i2c_client *client);
65817ed8	104	static int adm1021_remove(struct i2c_client *client);
1da177e4 LT	105	static struct adm1021_data adm1021_update_device(struct device dev);
	106
	107	/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
90ab5ee9	108	static bool read_only;
1da177e4 LT	109
1da177e4 LT	110
65817ed8 JD	111	static const struct i2c_device_id adm1021_id[] = {
	112	{ "adm1021", adm1021 },
	113	{ "adm1023", adm1023 },
	114	{ "max1617", max1617 },
	115	{ "max1617a", max1617a },
	116	{ "thmc10", thmc10 },
	117	{ "lm84", lm84 },
	118	{ "gl523sm", gl523sm },
	119	{ "mc1066", mc1066 },
	120	{ }
	121	};
	122	MODULE_DEVICE_TABLE(i2c, adm1021_id);
	123
1da177e4 LT	124	/* This is the driver that will be inserted */
1da177e4 LT	125	static struct i2c_driver adm1021_driver = {
65817ed8	126	.class = I2C_CLASS_HWMON,
cdaf7934	127	.driver = {
cdaf7934 LR	128	.name = "adm1021",
cdaf7934 LR	129	},
65817ed8 JD	130	.probe = adm1021_probe,
	131	.remove = adm1021_remove,
	132	.id_table = adm1021_id,
	133	.detect = adm1021_detect,
c3813d6a	134	.address_list = normal_i2c,
1da177e4 LT	135	};
1da177e4 LT	136
a8d6646e KH	137	static ssize_t show_temp(struct device *dev,
	138	struct device_attribute devattr, char buf)
	139	{
	140	int index = to_sensor_dev_attr(devattr)->index;
	141	struct adm1021_data *data = adm1021_update_device(dev);
	142
f2668895	143	return sprintf(buf, "%d\n", data->temp[index]);
a8d6646e KH	144	}
	145
	146	static ssize_t show_temp_max(struct device *dev,
	147	struct device_attribute devattr, char buf)
	148	{
	149	int index = to_sensor_dev_attr(devattr)->index;
	150	struct adm1021_data *data = adm1021_update_device(dev);
	151
f2668895	152	return sprintf(buf, "%d\n", data->temp_max[index]);
a8d6646e KH	153	}
	154
	155	static ssize_t show_temp_min(struct device *dev,
	156	struct device_attribute devattr, char buf)
	157	{
	158	int index = to_sensor_dev_attr(devattr)->index;
	159	struct adm1021_data *data = adm1021_update_device(dev);
	160
f2668895	161	return sprintf(buf, "%d\n", data->temp_min[index]);
1da177e4	162	}
1da177e4	163
739ba248 KH	164	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	165	char *buf)
	166	{
	167	int index = to_sensor_dev_attr(attr)->index;
	168	struct adm1021_data *data = adm1021_update_device(dev);
	169	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
	170	}
	171
c83c41e4 KH	172	static ssize_t show_alarms(struct device *dev,
	173	struct device_attribute *attr,
	174	char *buf)
	175	{
	176	struct adm1021_data *data = adm1021_update_device(dev);
	177	return sprintf(buf, "%u\n", data->alarms);
1da177e4	178	}
c83c41e4	179
a8d6646e KH	180	static ssize_t set_temp_max(struct device *dev,
	181	struct device_attribute *devattr,
	182	const char *buf, size_t count)
	183	{
	184	int index = to_sensor_dev_attr(devattr)->index;
	185	struct i2c_client *client = to_i2c_client(dev);
	186	struct adm1021_data *data = i2c_get_clientdata(client);
21d2a8f1 GR	187	long temp;
	188	int err;
	189
	190	err = kstrtol(buf, 10, &temp);
	191	if (err)
	192	return err;
	193	temp /= 1000;
a8d6646e KH	194
a8d6646e KH	195	mutex_lock(&data->update_lock);
2a844c14	196	data->temp_max[index] = clamp_val(temp, -128, 127);
a8d6646e KH	197	if (!read_only)
	198	i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
	199	data->temp_max[index]);
	200	mutex_unlock(&data->update_lock);
	201
	202	return count;
	203	}
	204
	205	static ssize_t set_temp_min(struct device *dev,
	206	struct device_attribute *devattr,
	207	const char *buf, size_t count)
	208	{
	209	int index = to_sensor_dev_attr(devattr)->index;
	210	struct i2c_client *client = to_i2c_client(dev);
	211	struct adm1021_data *data = i2c_get_clientdata(client);
21d2a8f1 GR	212	long temp;
	213	int err;
	214
	215	err = kstrtol(buf, 10, &temp);
	216	if (err)
	217	return err;
	218	temp /= 1000;
a8d6646e KH	219
a8d6646e KH	220	mutex_lock(&data->update_lock);
2a844c14	221	data->temp_min[index] = clamp_val(temp, -128, 127);
a8d6646e KH	222	if (!read_only)
	223	i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
	224	data->temp_min[index]);
	225	mutex_unlock(&data->update_lock);
	226
	227	return count;
1da177e4	228	}
1da177e4	229
905ffdc3 MA	230	static ssize_t show_low_power(struct device *dev,
	231	struct device_attribute devattr, char buf)
	232	{
	233	struct adm1021_data *data = adm1021_update_device(dev);
	234	return sprintf(buf, "%d\n", data->low_power);
	235	}
	236
	237	static ssize_t set_low_power(struct device *dev,
	238	struct device_attribute *devattr,
	239	const char *buf, size_t count)
	240	{
	241	struct i2c_client *client = to_i2c_client(dev);
	242	struct adm1021_data *data = i2c_get_clientdata(client);
21d2a8f1 GR	243	char low_power;
	244	unsigned long val;
	245	int err;
	246
	247	err = kstrtoul(buf, 10, &val);
	248	if (err)
	249	return err;
	250	low_power = val != 0;
905ffdc3 MA	251
	252	mutex_lock(&data->update_lock);
	253	if (low_power != data->low_power) {
	254	int config = i2c_smbus_read_byte_data(
	255	client, ADM1021_REG_CONFIG_R);
	256	data->low_power = low_power;
	257	i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
	258	(config & 0xBF) \| (low_power << 6));
	259	}
	260	mutex_unlock(&data->update_lock);
	261
	262	return count;
	263	}
	264
	265
a8d6646e KH	266	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	267	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max,
	268	set_temp_max, 0);
	269	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp_min,
	270	set_temp_min, 0);
	271	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	272	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_max,
	273	set_temp_max, 1);
	274	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_min,
	275	set_temp_min, 1);
739ba248 KH	276	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	277	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
	278	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	279	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	280	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	281
a8d6646e	282	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
905ffdc3	283	static DEVICE_ATTR(low_power, S_IWUSR \| S_IRUGO, show_low_power, set_low_power);
1da177e4	284
681c6f7a	285	static struct attribute *adm1021_attributes[] = {
a8d6646e KH	286	&sensor_dev_attr_temp1_max.dev_attr.attr,
	287	&sensor_dev_attr_temp1_min.dev_attr.attr,
	288	&sensor_dev_attr_temp1_input.dev_attr.attr,
	289	&sensor_dev_attr_temp2_max.dev_attr.attr,
	290	&sensor_dev_attr_temp2_min.dev_attr.attr,
	291	&sensor_dev_attr_temp2_input.dev_attr.attr,
739ba248 KH	292	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	293	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	294	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	295	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	296	&sensor_dev_attr_temp2_fault.dev_attr.attr,
681c6f7a	297	&dev_attr_alarms.attr,
905ffdc3	298	&dev_attr_low_power.attr,
681c6f7a MH	299	NULL
	300	};
	301
	302	static const struct attribute_group adm1021_group = {
	303	.attrs = adm1021_attributes,
	304	};
	305
65817ed8	306	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	307	static int adm1021_detect(struct i2c_client *client,
65817ed8	308	struct i2c_board_info *info)
1da177e4	309	{
65817ed8	310	struct i2c_adapter *adapter = client->adapter;
8007ea35 JD	311	const char *type_name;
8007ea35 JD	312	int conv_rate, status, config, man_id, dev_id;
1da177e4	313
c83c41e4	314	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
b55f3757	315	pr_debug("detect failed, smbus byte data not supported!\n");
65817ed8	316	return -ENODEV;
1da177e4	317	}
1da177e4	318
c83c41e4 KH	319	status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
	320	conv_rate = i2c_smbus_read_byte_data(client,
	321	ADM1021_REG_CONV_RATE_R);
	322	config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
1da177e4	323
8007ea35 JD	324	/* Check unused bits */
8007ea35 JD	325	if ((status & 0x03) \|\| (config & 0x3F) \|\| (conv_rate & 0xF8)) {
b55f3757	326	pr_debug("detect failed, chip not detected!\n");
8007ea35	327	return -ENODEV;
1da177e4 LT	328	}
	329
	330	/* Determine the chip type. */
8007ea35 JD	331	man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
8007ea35 JD	332	dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
1da177e4	333
591bfcfc GR	334	if (man_id < 0 \|\| dev_id < 0)
	335	return -ENODEV;
	336
8007ea35	337	if (man_id == 0x4d && dev_id == 0x01)
1da177e4	338	type_name = "max1617a";
8007ea35 JD	339	else if (man_id == 0x41) {
	340	if ((dev_id & 0xF0) == 0x30)
	341	type_name = "adm1023";
591bfcfc	342	else if ((dev_id & 0xF0) == 0x00)
8007ea35	343	type_name = "adm1021";
591bfcfc GR	344	else
591bfcfc GR	345	return -ENODEV;
8007ea35	346	} else if (man_id == 0x49)
1da177e4	347	type_name = "thmc10";
8007ea35	348	else if (man_id == 0x23)
1da177e4	349	type_name = "gl523sm";
8007ea35	350	else if (man_id == 0x54)
1da177e4	351	type_name = "mc1066";
591bfcfc GR	352	else {
	353	int lte, rte, lhi, rhi, llo, rlo;
	354
	355	/* extra checks for LM84 and MAX1617 to avoid misdetections */
	356
	357	llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
	358	rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
	359
	360	/* fail if any of the additional register reads failed */
	361	if (llo < 0 \|\| rlo < 0)
	362	return -ENODEV;
	363
	364	lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
	365	rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
	366	lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
	367	rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
	368
	369	/*
	370	* Fail for negative temperatures and negative high limits.
	371	* This check also catches read errors on the tested registers.
	372	*/
	373	if ((s8)lte < 0 \|\| (s8)rte < 0 \|\| (s8)lhi < 0 \|\| (s8)rhi < 0)
	374	return -ENODEV;
	375
	376	/* fail if all registers hold the same value */
	377	if (lte == rte && lte == lhi && lte == rhi && lte == llo
	378	&& lte == rlo)
	379	return -ENODEV;
	380
	381	/*
	382	* LM84 Mfr ID is in a different place,
	383	* and it has more unused bits.
	384	*/
	385	if (conv_rate == 0x00
	386	&& (config & 0x7F) == 0x00
	387	&& (status & 0xAB) == 0x00) {
	388	type_name = "lm84";
	389	} else {
	390	/* fail if low limits are larger than high limits */
	391	if ((s8)llo > lhi \|\| (s8)rlo > rhi)
	392	return -ENODEV;
	393	type_name = "max1617";
	394	}
	395	}
8007ea35	396
b55f3757	397	pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
65817ed8 JD	398	type_name, i2c_adapter_id(adapter), client->addr);
65817ed8 JD	399	strlcpy(info->type, type_name, I2C_NAME_SIZE);
1da177e4	400
65817ed8 JD	401	return 0;
65817ed8 JD	402	}
1da177e4	403
65817ed8 JD	404	static int adm1021_probe(struct i2c_client *client,
	405	const struct i2c_device_id *id)
	406	{
	407	struct adm1021_data *data;
	408	int err;
	409
06ce97d6 GR	410	data = devm_kzalloc(&client->dev, sizeof(struct adm1021_data),
06ce97d6 GR	411	GFP_KERNEL);
b55f3757	412	if (!data)
06ce97d6	413	return -ENOMEM;
65817ed8 JD	414
	415	i2c_set_clientdata(client, data);
	416	data->type = id->driver_data;
	417	mutex_init(&data->update_lock);
1da177e4 LT	418
1da177e4 LT	419	/* Initialize the ADM1021 chip */
65817ed8	420	if (data->type != lm84 && !read_only)
c83c41e4	421	adm1021_init_client(client);
1da177e4 LT	422
1da177e4 LT	423	/* Register sysfs hooks */
21d2a8f1 GR	424	err = sysfs_create_group(&client->dev.kobj, &adm1021_group);
21d2a8f1 GR	425	if (err)
06ce97d6	426	return err;
681c6f7a	427
1beeffe4 TJ	428	data->hwmon_dev = hwmon_device_register(&client->dev);
	429	if (IS_ERR(data->hwmon_dev)) {
	430	err = PTR_ERR(data->hwmon_dev);
06ce97d6	431	goto error;
943b0830 MH	432	}
943b0830 MH	433
1da177e4 LT	434	return 0;
1da177e4 LT	435
06ce97d6	436	error:
c83c41e4	437	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
1da177e4 LT	438	return err;
	439	}
	440
	441	static void adm1021_init_client(struct i2c_client *client)
	442	{
	443	/* Enable ADC and disable suspend mode */
c83c41e4 KH	444	i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
c83c41e4 KH	445	i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
1da177e4	446	/* Set Conversion rate to 1/sec (this can be tinkered with) */
c83c41e4	447	i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
1da177e4 LT	448	}
1da177e4 LT	449
65817ed8	450	static int adm1021_remove(struct i2c_client *client)
1da177e4	451	{
943b0830	452	struct adm1021_data *data = i2c_get_clientdata(client);
1da177e4	453
1beeffe4	454	hwmon_device_unregister(data->hwmon_dev);
681c6f7a	455	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
943b0830	456
1da177e4 LT	457	return 0;
	458	}
	459
1da177e4 LT	460	static struct adm1021_data adm1021_update_device(struct device dev)
	461	{
	462	struct i2c_client *client = to_i2c_client(dev);
	463	struct adm1021_data *data = i2c_get_clientdata(client);
	464
9a61bf63	465	mutex_lock(&data->update_lock);
1da177e4 LT	466
	467	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	468	\|\| !data->valid) {
a8d6646e KH	469	int i;
a8d6646e KH	470
1da177e4 LT	471	dev_dbg(&client->dev, "Starting adm1021 update\n");
1da177e4 LT	472
a8d6646e	473	for (i = 0; i < 2; i++) {
f2668895 MA	474	data->temp[i] = 1000 *
	475	(s8) i2c_smbus_read_byte_data(
	476	client, ADM1021_REG_TEMP(i));
	477	data->temp_max[i] = 1000 *
	478	(s8) i2c_smbus_read_byte_data(
	479	client, ADM1021_REG_TOS_R(i));
	480	data->temp_min[i] = 1000 *
	481	(s8) i2c_smbus_read_byte_data(
	482	client, ADM1021_REG_THYST_R(i));
a8d6646e	483	}
c83c41e4 KH	484	data->alarms = i2c_smbus_read_byte_data(client,
c83c41e4 KH	485	ADM1021_REG_STATUS) & 0x7c;
1da177e4	486	if (data->type == adm1023) {
21d2a8f1 GR	487	/*
	488	* The ADM1023 provides 3 extra bits of precision for
	489	* the remote sensor in extra registers.
	490	*/
f2668895 MA	491	data->temp[1] += 125 * (i2c_smbus_read_byte_data(
	492	client, ADM1023_REG_REM_TEMP_PREC) >> 5);
	493	data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
	494	client, ADM1023_REG_REM_TOS_PREC) >> 5);
	495	data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
	496	client, ADM1023_REG_REM_THYST_PREC) >> 5);
c83c41e4 KH	497	data->remote_temp_offset =
	498	i2c_smbus_read_byte_data(client,
	499	ADM1023_REG_REM_OFFSET);
	500	data->remote_temp_offset_prec =
	501	i2c_smbus_read_byte_data(client,
	502	ADM1023_REG_REM_OFFSET_PREC);
1da177e4 LT	503	}
	504	data->last_updated = jiffies;
	505	data->valid = 1;
	506	}
	507
9a61bf63	508	mutex_unlock(&data->update_lock);
1da177e4 LT	509
	510	return data;
	511	}
	512
f0967eea	513	module_i2c_driver(adm1021_driver);
1da177e4	514
21d2a8f1	515	MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
1da177e4 LT	516	"Philip Edelbrock <phil@netroedge.com>");
	517	MODULE_DESCRIPTION("adm1021 driver");
	518	MODULE_LICENSE("GPL");
	519
	520	module_param(read_only, bool, 0);
	521	MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");