[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 };

/* Insmod parameters */
I2C_CLIENT_INSMOD_8(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;
	struct device *hwmon_dev;
	enum chips type;

	struct mutex update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	s8 temp_max[2];		/* Register values */
	s8 temp_min[2];
	s8 temp[2];
	u8 alarms;
	/* Special values for ADM1023 only */
	u8 remote_temp_prec;
	u8 remote_temp_os_prec;
	u8 remote_temp_hyst_prec;
	u8 remote_temp_offset;
	u8 remote_temp_offset_prec;
};

static int adm1021_attach_adapter(struct i2c_adapter *adapter);
static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
static void adm1021_init_client(struct i2c_client *client);
static int adm1021_detach_client(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 int read_only;


/* This is the driver that will be inserted */
static struct i2c_driver adm1021_driver = {
	.driver = {
		.name	= "adm1021",
	},
	.attach_adapter	= adm1021_attach_adapter,
	.detach_client	= adm1021_detach_client,
};

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", 1000 * 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", 1000 * 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", 1000 * 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 = simple_strtol(buf, NULL, 10) / 1000;

	mutex_lock(&data->update_lock);
	data->temp_max[index] = SENSORS_LIMIT(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 = simple_strtol(buf, NULL, 10) / 1000;

	mutex_lock(&data->update_lock);
	data->temp_min[index] = SENSORS_LIMIT(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 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 int adm1021_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, adm1021_detect);
}

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,
	NULL
};

static const struct attribute_group adm1021_group = {
	.attrs = adm1021_attributes,
};

static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
{
	int i;
	struct i2c_client *client;
	struct adm1021_data *data;
	int err = 0;
	const char *type_name = "";
	int conv_rate, status, config;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		pr_debug("adm1021: detect failed, "
			 "smbus byte data not supported!\n");
		goto error0;
	}

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access adm1021 register values. */

	if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
		pr_debug("adm1021: detect failed, kzalloc failed!\n");
		err = -ENOMEM;
		goto error0;
	}

	client = &data->client;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &adm1021_driver;
	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);

	/* Now, we do the remaining detection. */
	if (kind < 0) {
		if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00
		    || (conv_rate & 0xF8) != 0x00) {
			pr_debug("adm1021: detect failed, "
				 "chip not detected!\n");
			err = -ENODEV;
			goto error1;
		}
	}

	/* Determine the chip type. */
	if (kind <= 0) {
		i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
		if (i == 0x41)
			if ((i2c_smbus_read_byte_data(client,
					ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
				kind = adm1023;
			else
				kind = adm1021;
		else if (i == 0x49)
			kind = thmc10;
		else if (i == 0x23)
			kind = gl523sm;
		else if ((i == 0x4d) &&
			 (i2c_smbus_read_byte_data(client,
						   ADM1021_REG_DEV_ID) == 0x01))
			kind = max1617a;
		else if (i == 0x54)
			kind = mc1066;
		/* LM84 Mfr ID in a different place, and it has more unused bits */
		else if (conv_rate == 0x00
			 && (kind == 0 /* skip extra detection */
			     || ((config & 0x7F) == 0x00
				 && (status & 0xAB) == 0x00)))
			kind = lm84;
		else
			kind = max1617;
	}

	if (kind == max1617) {
		type_name = "max1617";
	} else if (kind == max1617a) {
		type_name = "max1617a";
	} else if (kind == adm1021) {
		type_name = "adm1021";
	} else if (kind == adm1023) {
		type_name = "adm1023";
	} else if (kind == thmc10) {
		type_name = "thmc10";
	} else if (kind == lm84) {
		type_name = "lm84";
	} else if (kind == gl523sm) {
		type_name = "gl523sm";
	} else if (kind == mc1066) {
		type_name = "mc1066";
	}
	pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
		 type_name, i2c_adapter_id(adapter), address);

	/* Fill in the remaining client fields */
	strlcpy(client->name, type_name, I2C_NAME_SIZE);
	data->type = kind;
	mutex_init(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(client)))
		goto error1;

	/* Initialize the ADM1021 chip */
	if (kind != lm84 && !read_only)
		adm1021_init_client(client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
		goto error2;

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto error3;
	}

	return 0;

error3:
	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
error2:
	i2c_detach_client(client);
error1:
	kfree(data);
error0:
	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_detach_client(struct i2c_client *client)
{
	struct adm1021_data *data = i2c_get_clientdata(client);
	int err;

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

	if ((err = i2c_detach_client(client)))
		return err;

	kfree(data);
	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] = i2c_smbus_read_byte_data(client,
						ADM1021_REG_TEMP(i));
			data->temp_max[i] = i2c_smbus_read_byte_data(client,
						ADM1021_REG_TOS_R(i));
			data->temp_min[i] = 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) {
			data->remote_temp_prec =
				i2c_smbus_read_byte_data(client,
						ADM1023_REG_REM_TEMP_PREC);
			data->remote_temp_os_prec =
				i2c_smbus_read_byte_data(client,
						ADM1023_REG_REM_TOS_PREC);
			data->remote_temp_hyst_prec =
				i2c_smbus_read_byte_data(client,
						ADM1023_REG_REM_THYST_PREC);
			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 int __init sensors_adm1021_init(void)
{
	return i2c_add_driver(&adm1021_driver);
}

static void __exit sensors_adm1021_exit(void)
{
	i2c_del_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");

module_init(sensors_adm1021_init)
module_exit(sensors_adm1021_exit)
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
c83c41e4	3	monitoring
1da177e4 LT	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	*/
	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 LT	36
1da177e4 LT	37	/* Insmod parameters */
c83c41e4 KH	38	I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm,
c83c41e4 KH	39	mc1066);
1da177e4 LT	40
	41	/* adm1021 constants specified below */
	42
	43	/* The adm1021 registers */
	44	/* Read-only */
a8d6646e KH	45	/* For nr in 0-1 */
a8d6646e KH	46	#define ADM1021_REG_TEMP(nr) (nr)
1da177e4	47	#define ADM1021_REG_STATUS 0x02
c83c41e4 KH	48	/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
	49	#define ADM1021_REG_MAN_ID 0xFE
	50	/* ADM1021 = 0x0X, ADM1023 = 0x3X */
	51	#define ADM1021_REG_DEV_ID 0xFF
1da177e4 LT	52	/* These use different addresses for reading/writing */
	53	#define ADM1021_REG_CONFIG_R 0x03
	54	#define ADM1021_REG_CONFIG_W 0x09
	55	#define ADM1021_REG_CONV_RATE_R 0x04
	56	#define ADM1021_REG_CONV_RATE_W 0x0A
	57	/* These are for the ADM1023's additional precision on the remote temp sensor */
c83c41e4 KH	58	#define ADM1023_REG_REM_TEMP_PREC 0x10
	59	#define ADM1023_REG_REM_OFFSET 0x11
	60	#define ADM1023_REG_REM_OFFSET_PREC 0x12
	61	#define ADM1023_REG_REM_TOS_PREC 0x13
	62	#define ADM1023_REG_REM_THYST_PREC 0x14
1da177e4	63	/* limits */
a8d6646e KH	64	/* For nr in 0-1 */
	65	#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
	66	#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
	67	#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
	68	#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
1da177e4 LT	69	/* write-only */
	70	#define ADM1021_REG_ONESHOT 0x0F
	71
1da177e4 LT	72	/* Initial values */
1da177e4 LT	73
c83c41e4 KH	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
1da177e4 LT	77	clearing it. Weird, ey? --Phil */
	78
	79	/* Each client has this additional data */
	80	struct adm1021_data {
	81	struct i2c_client client;
1beeffe4	82	struct device *hwmon_dev;
1da177e4 LT	83	enum chips type;
1da177e4 LT	84
9a61bf63	85	struct mutex update_lock;
1da177e4 LT	86	char valid; /* !=0 if following fields are valid */
	87	unsigned long last_updated; /* In jiffies */
	88
a8d6646e KH	89	s8 temp_max[2]; /* Register values */
	90	s8 temp_min[2];
	91	s8 temp[2];
	92	u8 alarms;
	93	/* Special values for ADM1023 only */
	94	u8 remote_temp_prec;
	95	u8 remote_temp_os_prec;
	96	u8 remote_temp_hyst_prec;
	97	u8 remote_temp_offset;
	98	u8 remote_temp_offset_prec;
1da177e4 LT	99	};
	100
	101	static int adm1021_attach_adapter(struct i2c_adapter *adapter);
	102	static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
	103	static void adm1021_init_client(struct i2c_client *client);
	104	static int adm1021_detach_client(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 */
02002963	108	static int read_only;
1da177e4 LT	109
	110
	111	/* This is the driver that will be inserted */
	112	static struct i2c_driver adm1021_driver = {
cdaf7934	113	.driver = {
cdaf7934 LR	114	.name = "adm1021",
cdaf7934 LR	115	},
1da177e4 LT	116	.attach_adapter = adm1021_attach_adapter,
	117	.detach_client = adm1021_detach_client,
	118	};
	119
a8d6646e KH	120	static ssize_t show_temp(struct device *dev,
	121	struct device_attribute devattr, char buf)
	122	{
	123	int index = to_sensor_dev_attr(devattr)->index;
	124	struct adm1021_data *data = adm1021_update_device(dev);
	125
	126	return sprintf(buf, "%d\n", 1000 * data->temp[index]);
	127	}
	128
	129	static ssize_t show_temp_max(struct device *dev,
	130	struct device_attribute devattr, char buf)
	131	{
	132	int index = to_sensor_dev_attr(devattr)->index;
	133	struct adm1021_data *data = adm1021_update_device(dev);
	134
	135	return sprintf(buf, "%d\n", 1000 * data->temp_max[index]);
	136	}
	137
	138	static ssize_t show_temp_min(struct device *dev,
	139	struct device_attribute devattr, char buf)
	140	{
	141	int index = to_sensor_dev_attr(devattr)->index;
	142	struct adm1021_data *data = adm1021_update_device(dev);
	143
	144	return sprintf(buf, "%d\n", 1000 * data->temp_min[index]);
1da177e4	145	}
1da177e4	146
739ba248 KH	147	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	148	char *buf)
	149	{
	150	int index = to_sensor_dev_attr(attr)->index;
	151	struct adm1021_data *data = adm1021_update_device(dev);
	152	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
	153	}
	154
c83c41e4 KH	155	static ssize_t show_alarms(struct device *dev,
	156	struct device_attribute *attr,
	157	char *buf)
	158	{
	159	struct adm1021_data *data = adm1021_update_device(dev);
	160	return sprintf(buf, "%u\n", data->alarms);
1da177e4	161	}
c83c41e4	162
a8d6646e KH	163	static ssize_t set_temp_max(struct device *dev,
	164	struct device_attribute *devattr,
	165	const char *buf, size_t count)
	166	{
	167	int index = to_sensor_dev_attr(devattr)->index;
	168	struct i2c_client *client = to_i2c_client(dev);
	169	struct adm1021_data *data = i2c_get_clientdata(client);
	170	long temp = simple_strtol(buf, NULL, 10) / 1000;
	171
	172	mutex_lock(&data->update_lock);
	173	data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127);
	174	if (!read_only)
	175	i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
	176	data->temp_max[index]);
	177	mutex_unlock(&data->update_lock);
	178
	179	return count;
	180	}
	181
	182	static ssize_t set_temp_min(struct device *dev,
	183	struct device_attribute *devattr,
	184	const char *buf, size_t count)
	185	{
	186	int index = to_sensor_dev_attr(devattr)->index;
	187	struct i2c_client *client = to_i2c_client(dev);
	188	struct adm1021_data *data = i2c_get_clientdata(client);
	189	long temp = simple_strtol(buf, NULL, 10) / 1000;
	190
	191	mutex_lock(&data->update_lock);
	192	data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127);
	193	if (!read_only)
	194	i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
	195	data->temp_min[index]);
	196	mutex_unlock(&data->update_lock);
	197
	198	return count;
1da177e4	199	}
1da177e4	200
a8d6646e KH	201	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	202	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max,
	203	set_temp_max, 0);
	204	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp_min,
	205	set_temp_min, 0);
	206	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	207	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_max,
	208	set_temp_max, 1);
	209	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_min,
	210	set_temp_min, 1);
739ba248 KH	211	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	212	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
	213	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	214	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	215	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	216
a8d6646e	217	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1da177e4 LT	218
	219	static int adm1021_attach_adapter(struct i2c_adapter *adapter)
	220	{
	221	if (!(adapter->class & I2C_CLASS_HWMON))
	222	return 0;
2ed2dc3c	223	return i2c_probe(adapter, &addr_data, adm1021_detect);
1da177e4 LT	224	}
1da177e4 LT	225
681c6f7a	226	static struct attribute *adm1021_attributes[] = {
a8d6646e KH	227	&sensor_dev_attr_temp1_max.dev_attr.attr,
	228	&sensor_dev_attr_temp1_min.dev_attr.attr,
	229	&sensor_dev_attr_temp1_input.dev_attr.attr,
	230	&sensor_dev_attr_temp2_max.dev_attr.attr,
	231	&sensor_dev_attr_temp2_min.dev_attr.attr,
	232	&sensor_dev_attr_temp2_input.dev_attr.attr,
739ba248 KH	233	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	234	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	235	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	236	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	237	&sensor_dev_attr_temp2_fault.dev_attr.attr,
681c6f7a MH	238	&dev_attr_alarms.attr,
	239	NULL
	240	};
	241
	242	static const struct attribute_group adm1021_group = {
	243	.attrs = adm1021_attributes,
	244	};
	245
1da177e4 LT	246	static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
	247	{
	248	int i;
c83c41e4	249	struct i2c_client *client;
1da177e4 LT	250	struct adm1021_data *data;
	251	int err = 0;
	252	const char *type_name = "";
c83c41e4	253	int conv_rate, status, config;
1da177e4	254
c83c41e4 KH	255	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
	256	pr_debug("adm1021: detect failed, "
	257	"smbus byte data not supported!\n");
1da177e4	258	goto error0;
c83c41e4	259	}
1da177e4 LT	260
	261	/* OK. For now, we presume we have a valid client. We now create the
	262	client structure, even though we cannot fill it completely yet.
c83c41e4	263	But it allows us to access adm1021 register values. */
1da177e4	264
ba9c2e8d	265	if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
c83c41e4	266	pr_debug("adm1021: detect failed, kzalloc failed!\n");
1da177e4 LT	267	err = -ENOMEM;
	268	goto error0;
	269	}
1da177e4	270
c83c41e4 KH	271	client = &data->client;
	272	i2c_set_clientdata(client, data);
	273	client->addr = address;
	274	client->adapter = adapter;
	275	client->driver = &adm1021_driver;
	276	status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
	277	conv_rate = i2c_smbus_read_byte_data(client,
	278	ADM1021_REG_CONV_RATE_R);
	279	config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
1da177e4 LT	280
	281	/* Now, we do the remaining detection. */
	282	if (kind < 0) {
c83c41e4 KH	283	if ((status & 0x03) != 0x00 \|\| (config & 0x3F) != 0x00
	284	\|\| (conv_rate & 0xF8) != 0x00) {
	285	pr_debug("adm1021: detect failed, "
	286	"chip not detected!\n");
1da177e4 LT	287	err = -ENODEV;
	288	goto error1;
	289	}
	290	}
	291
	292	/* Determine the chip type. */
	293	if (kind <= 0) {
c83c41e4	294	i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
1da177e4	295	if (i == 0x41)
c83c41e4 KH	296	if ((i2c_smbus_read_byte_data(client,
c83c41e4 KH	297	ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
1da177e4 LT	298	kind = adm1023;
	299	else
	300	kind = adm1021;
	301	else if (i == 0x49)
	302	kind = thmc10;
	303	else if (i == 0x23)
	304	kind = gl523sm;
	305	else if ((i == 0x4d) &&
c83c41e4 KH	306	(i2c_smbus_read_byte_data(client,
c83c41e4 KH	307	ADM1021_REG_DEV_ID) == 0x01))
1da177e4 LT	308	kind = max1617a;
	309	else if (i == 0x54)
	310	kind = mc1066;
	311	/* LM84 Mfr ID in a different place, and it has more unused bits */
c83c41e4 KH	312	else if (conv_rate == 0x00
	313	&& (kind == 0 /* skip extra detection */
	314	\|\| ((config & 0x7F) == 0x00
	315	&& (status & 0xAB) == 0x00)))
1da177e4 LT	316	kind = lm84;
	317	else
	318	kind = max1617;
	319	}
	320
	321	if (kind == max1617) {
	322	type_name = "max1617";
	323	} else if (kind == max1617a) {
	324	type_name = "max1617a";
	325	} else if (kind == adm1021) {
	326	type_name = "adm1021";
	327	} else if (kind == adm1023) {
	328	type_name = "adm1023";
	329	} else if (kind == thmc10) {
	330	type_name = "thmc10";
	331	} else if (kind == lm84) {
	332	type_name = "lm84";
	333	} else if (kind == gl523sm) {
	334	type_name = "gl523sm";
	335	} else if (kind == mc1066) {
	336	type_name = "mc1066";
	337	}
c83c41e4 KH	338	pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
c83c41e4 KH	339	type_name, i2c_adapter_id(adapter), address);
1da177e4	340
c83c41e4 KH	341	/* Fill in the remaining client fields */
c83c41e4 KH	342	strlcpy(client->name, type_name, I2C_NAME_SIZE);
1da177e4	343	data->type = kind;
9a61bf63	344	mutex_init(&data->update_lock);
1da177e4 LT	345
1da177e4 LT	346	/* Tell the I2C layer a new client has arrived */
c83c41e4	347	if ((err = i2c_attach_client(client)))
1da177e4 LT	348	goto error1;
	349
	350	/* Initialize the ADM1021 chip */
c83c41e4 KH	351	if (kind != lm84 && !read_only)
c83c41e4 KH	352	adm1021_init_client(client);
1da177e4 LT	353
1da177e4 LT	354	/* Register sysfs hooks */
c83c41e4	355	if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
681c6f7a MH	356	goto error2;
681c6f7a MH	357
1beeffe4 TJ	358	data->hwmon_dev = hwmon_device_register(&client->dev);
	359	if (IS_ERR(data->hwmon_dev)) {
	360	err = PTR_ERR(data->hwmon_dev);
681c6f7a	361	goto error3;
943b0830 MH	362	}
943b0830 MH	363
1da177e4 LT	364	return 0;
1da177e4 LT	365
681c6f7a	366	error3:
c83c41e4	367	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
943b0830	368	error2:
c83c41e4	369	i2c_detach_client(client);
1da177e4 LT	370	error1:
	371	kfree(data);
	372	error0:
	373	return err;
	374	}
	375
	376	static void adm1021_init_client(struct i2c_client *client)
	377	{
	378	/* Enable ADC and disable suspend mode */
c83c41e4 KH	379	i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
c83c41e4 KH	380	i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
1da177e4	381	/* Set Conversion rate to 1/sec (this can be tinkered with) */
c83c41e4	382	i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
1da177e4 LT	383	}
	384
	385	static int adm1021_detach_client(struct i2c_client *client)
	386	{
943b0830	387	struct adm1021_data *data = i2c_get_clientdata(client);
1da177e4 LT	388	int err;
1da177e4 LT	389
1beeffe4	390	hwmon_device_unregister(data->hwmon_dev);
681c6f7a	391	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
943b0830	392
7bef5594	393	if ((err = i2c_detach_client(client)))
1da177e4	394	return err;
1da177e4	395
943b0830	396	kfree(data);
1da177e4 LT	397	return 0;
	398	}
	399
1da177e4 LT	400	static struct adm1021_data adm1021_update_device(struct device dev)
	401	{
	402	struct i2c_client *client = to_i2c_client(dev);
	403	struct adm1021_data *data = i2c_get_clientdata(client);
	404
9a61bf63	405	mutex_lock(&data->update_lock);
1da177e4 LT	406
	407	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	408	\|\| !data->valid) {
a8d6646e KH	409	int i;
a8d6646e KH	410
1da177e4 LT	411	dev_dbg(&client->dev, "Starting adm1021 update\n");
1da177e4 LT	412
a8d6646e KH	413	for (i = 0; i < 2; i++) {
	414	data->temp[i] = i2c_smbus_read_byte_data(client,
	415	ADM1021_REG_TEMP(i));
	416	data->temp_max[i] = i2c_smbus_read_byte_data(client,
	417	ADM1021_REG_TOS_R(i));
	418	data->temp_min[i] = i2c_smbus_read_byte_data(client,
	419	ADM1021_REG_THYST_R(i));
	420	}
c83c41e4 KH	421	data->alarms = i2c_smbus_read_byte_data(client,
c83c41e4 KH	422	ADM1021_REG_STATUS) & 0x7c;
1da177e4	423	if (data->type == adm1023) {
c83c41e4 KH	424	data->remote_temp_prec =
	425	i2c_smbus_read_byte_data(client,
	426	ADM1023_REG_REM_TEMP_PREC);
	427	data->remote_temp_os_prec =
	428	i2c_smbus_read_byte_data(client,
	429	ADM1023_REG_REM_TOS_PREC);
	430	data->remote_temp_hyst_prec =
	431	i2c_smbus_read_byte_data(client,
	432	ADM1023_REG_REM_THYST_PREC);
	433	data->remote_temp_offset =
	434	i2c_smbus_read_byte_data(client,
	435	ADM1023_REG_REM_OFFSET);
	436	data->remote_temp_offset_prec =
	437	i2c_smbus_read_byte_data(client,
	438	ADM1023_REG_REM_OFFSET_PREC);
1da177e4 LT	439	}
	440	data->last_updated = jiffies;
	441	data->valid = 1;
	442	}
	443
9a61bf63	444	mutex_unlock(&data->update_lock);
1da177e4 LT	445
	446	return data;
	447	}
	448
	449	static int __init sensors_adm1021_init(void)
	450	{
	451	return i2c_add_driver(&adm1021_driver);
	452	}
	453
	454	static void __exit sensors_adm1021_exit(void)
	455	{
	456	i2c_del_driver(&adm1021_driver);
	457	}
	458
	459	MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
	460	"Philip Edelbrock <phil@netroedge.com>");
	461	MODULE_DESCRIPTION("adm1021 driver");
	462	MODULE_LICENSE("GPL");
	463
	464	module_param(read_only, bool, 0);
	465	MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
	466
	467	module_init(sensors_adm1021_init)
	468	module_exit(sensors_adm1021_exit)