[mirror_ubuntu-bionic-kernel.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 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 */
	34	static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
	35	0x29, 0x2a, 0x2b,
c83c41e4	36	0x4c, 0x4d, 0x4e,
1da177e4	37	I2C_CLIENT_END };
1da177e4 LT	38
1da177e4 LT	39	/* Insmod parameters */
c83c41e4 KH	40	I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm,
c83c41e4 KH	41	mc1066);
1da177e4 LT	42
	43	/* adm1021 constants specified below */
	44
	45	/* The adm1021 registers */
	46	/* Read-only */
a8d6646e KH	47	/* For nr in 0-1 */
a8d6646e KH	48	#define ADM1021_REG_TEMP(nr) (nr)
1da177e4	49	#define ADM1021_REG_STATUS 0x02
c83c41e4 KH	50	/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
	51	#define ADM1021_REG_MAN_ID 0xFE
	52	/* ADM1021 = 0x0X, ADM1023 = 0x3X */
	53	#define ADM1021_REG_DEV_ID 0xFF
1da177e4 LT	54	/* These use different addresses for reading/writing */
	55	#define ADM1021_REG_CONFIG_R 0x03
	56	#define ADM1021_REG_CONFIG_W 0x09
	57	#define ADM1021_REG_CONV_RATE_R 0x04
	58	#define ADM1021_REG_CONV_RATE_W 0x0A
	59	/* These are for the ADM1023's additional precision on the remote temp sensor */
c83c41e4 KH	60	#define ADM1023_REG_REM_TEMP_PREC 0x10
	61	#define ADM1023_REG_REM_OFFSET 0x11
	62	#define ADM1023_REG_REM_OFFSET_PREC 0x12
	63	#define ADM1023_REG_REM_TOS_PREC 0x13
	64	#define ADM1023_REG_REM_THYST_PREC 0x14
1da177e4	65	/* limits */
a8d6646e KH	66	/* For nr in 0-1 */
	67	#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
	68	#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
	69	#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
	70	#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
1da177e4 LT	71	/* write-only */
	72	#define ADM1021_REG_ONESHOT 0x0F
	73
1da177e4 LT	74	/* Initial values */
1da177e4 LT	75
c83c41e4 KH	76	/* Note: Even though I left the low and high limits named os and hyst,
	77	they don't quite work like a thermostat the way the LM75 does. I.e.,
	78	a lower temp than THYST actually triggers an alarm instead of
1da177e4 LT	79	clearing it. Weird, ey? --Phil */
	80
	81	/* Each client has this additional data */
	82	struct adm1021_data {
	83	struct i2c_client client;
1beeffe4	84	struct device *hwmon_dev;
1da177e4 LT	85	enum chips type;
1da177e4 LT	86
9a61bf63	87	struct mutex update_lock;
1da177e4 LT	88	char valid; /* !=0 if following fields are valid */
	89	unsigned long last_updated; /* In jiffies */
	90
a8d6646e KH	91	s8 temp_max[2]; /* Register values */
	92	s8 temp_min[2];
	93	s8 temp[2];
	94	u8 alarms;
	95	/* Special values for ADM1023 only */
	96	u8 remote_temp_prec;
	97	u8 remote_temp_os_prec;
	98	u8 remote_temp_hyst_prec;
	99	u8 remote_temp_offset;
	100	u8 remote_temp_offset_prec;
1da177e4 LT	101	};
	102
	103	static int adm1021_attach_adapter(struct i2c_adapter *adapter);
	104	static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
	105	static void adm1021_init_client(struct i2c_client *client);
	106	static int adm1021_detach_client(struct i2c_client *client);
1da177e4 LT	107	static struct adm1021_data adm1021_update_device(struct device dev);
	108
	109	/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
02002963	110	static int read_only;
1da177e4 LT	111
	112
	113	/* This is the driver that will be inserted */
	114	static struct i2c_driver adm1021_driver = {
cdaf7934	115	.driver = {
cdaf7934 LR	116	.name = "adm1021",
cdaf7934 LR	117	},
1da177e4 LT	118	.attach_adapter = adm1021_attach_adapter,
	119	.detach_client = adm1021_detach_client,
	120	};
	121
a8d6646e KH	122	static ssize_t show_temp(struct device *dev,
	123	struct device_attribute devattr, char buf)
	124	{
	125	int index = to_sensor_dev_attr(devattr)->index;
	126	struct adm1021_data *data = adm1021_update_device(dev);
	127
	128	return sprintf(buf, "%d\n", 1000 * data->temp[index]);
	129	}
	130
	131	static ssize_t show_temp_max(struct device *dev,
	132	struct device_attribute devattr, char buf)
	133	{
	134	int index = to_sensor_dev_attr(devattr)->index;
	135	struct adm1021_data *data = adm1021_update_device(dev);
	136
	137	return sprintf(buf, "%d\n", 1000 * data->temp_max[index]);
	138	}
	139
	140	static ssize_t show_temp_min(struct device *dev,
	141	struct device_attribute devattr, char buf)
	142	{
	143	int index = to_sensor_dev_attr(devattr)->index;
	144	struct adm1021_data *data = adm1021_update_device(dev);
	145
	146	return sprintf(buf, "%d\n", 1000 * data->temp_min[index]);
1da177e4	147	}
1da177e4	148
739ba248 KH	149	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	150	char *buf)
	151	{
	152	int index = to_sensor_dev_attr(attr)->index;
	153	struct adm1021_data *data = adm1021_update_device(dev);
	154	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
	155	}
	156
c83c41e4 KH	157	static ssize_t show_alarms(struct device *dev,
	158	struct device_attribute *attr,
	159	char *buf)
	160	{
	161	struct adm1021_data *data = adm1021_update_device(dev);
	162	return sprintf(buf, "%u\n", data->alarms);
1da177e4	163	}
c83c41e4	164
a8d6646e KH	165	static ssize_t set_temp_max(struct device *dev,
	166	struct device_attribute *devattr,
	167	const char *buf, size_t count)
	168	{
	169	int index = to_sensor_dev_attr(devattr)->index;
	170	struct i2c_client *client = to_i2c_client(dev);
	171	struct adm1021_data *data = i2c_get_clientdata(client);
	172	long temp = simple_strtol(buf, NULL, 10) / 1000;
	173
	174	mutex_lock(&data->update_lock);
	175	data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127);
	176	if (!read_only)
	177	i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
	178	data->temp_max[index]);
	179	mutex_unlock(&data->update_lock);
	180
	181	return count;
	182	}
	183
	184	static ssize_t set_temp_min(struct device *dev,
	185	struct device_attribute *devattr,
	186	const char *buf, size_t count)
	187	{
	188	int index = to_sensor_dev_attr(devattr)->index;
	189	struct i2c_client *client = to_i2c_client(dev);
	190	struct adm1021_data *data = i2c_get_clientdata(client);
	191	long temp = simple_strtol(buf, NULL, 10) / 1000;
	192
	193	mutex_lock(&data->update_lock);
	194	data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127);
	195	if (!read_only)
	196	i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
	197	data->temp_min[index]);
	198	mutex_unlock(&data->update_lock);
	199
	200	return count;
1da177e4	201	}
1da177e4	202
a8d6646e KH	203	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	204	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max,
	205	set_temp_max, 0);
	206	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp_min,
	207	set_temp_min, 0);
	208	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	209	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_max,
	210	set_temp_max, 1);
	211	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_min,
	212	set_temp_min, 1);
739ba248 KH	213	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	214	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
	215	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	216	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	217	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	218
a8d6646e	219	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1da177e4 LT	220
	221	static int adm1021_attach_adapter(struct i2c_adapter *adapter)
	222	{
	223	if (!(adapter->class & I2C_CLASS_HWMON))
	224	return 0;
2ed2dc3c	225	return i2c_probe(adapter, &addr_data, adm1021_detect);
1da177e4 LT	226	}
1da177e4 LT	227
681c6f7a	228	static struct attribute *adm1021_attributes[] = {
a8d6646e KH	229	&sensor_dev_attr_temp1_max.dev_attr.attr,
	230	&sensor_dev_attr_temp1_min.dev_attr.attr,
	231	&sensor_dev_attr_temp1_input.dev_attr.attr,
	232	&sensor_dev_attr_temp2_max.dev_attr.attr,
	233	&sensor_dev_attr_temp2_min.dev_attr.attr,
	234	&sensor_dev_attr_temp2_input.dev_attr.attr,
739ba248 KH	235	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	236	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	237	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	238	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	239	&sensor_dev_attr_temp2_fault.dev_attr.attr,
681c6f7a MH	240	&dev_attr_alarms.attr,
	241	NULL
	242	};
	243
	244	static const struct attribute_group adm1021_group = {
	245	.attrs = adm1021_attributes,
	246	};
	247
1da177e4 LT	248	static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
	249	{
	250	int i;
c83c41e4	251	struct i2c_client *client;
1da177e4 LT	252	struct adm1021_data *data;
	253	int err = 0;
	254	const char *type_name = "";
c83c41e4	255	int conv_rate, status, config;
1da177e4	256
c83c41e4 KH	257	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
	258	pr_debug("adm1021: detect failed, "
	259	"smbus byte data not supported!\n");
1da177e4	260	goto error0;
c83c41e4	261	}
1da177e4 LT	262
	263	/* OK. For now, we presume we have a valid client. We now create the
	264	client structure, even though we cannot fill it completely yet.
c83c41e4	265	But it allows us to access adm1021 register values. */
1da177e4	266
ba9c2e8d	267	if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
c83c41e4	268	pr_debug("adm1021: detect failed, kzalloc failed!\n");
1da177e4 LT	269	err = -ENOMEM;
	270	goto error0;
	271	}
1da177e4	272
c83c41e4 KH	273	client = &data->client;
	274	i2c_set_clientdata(client, data);
	275	client->addr = address;
	276	client->adapter = adapter;
	277	client->driver = &adm1021_driver;
	278	status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
	279	conv_rate = i2c_smbus_read_byte_data(client,
	280	ADM1021_REG_CONV_RATE_R);
	281	config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
1da177e4 LT	282
	283	/* Now, we do the remaining detection. */
	284	if (kind < 0) {
c83c41e4 KH	285	if ((status & 0x03) != 0x00 \|\| (config & 0x3F) != 0x00
	286	\|\| (conv_rate & 0xF8) != 0x00) {
	287	pr_debug("adm1021: detect failed, "
	288	"chip not detected!\n");
1da177e4 LT	289	err = -ENODEV;
	290	goto error1;
	291	}
	292	}
	293
	294	/* Determine the chip type. */
	295	if (kind <= 0) {
c83c41e4	296	i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
1da177e4	297	if (i == 0x41)
c83c41e4 KH	298	if ((i2c_smbus_read_byte_data(client,
c83c41e4 KH	299	ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
1da177e4 LT	300	kind = adm1023;
	301	else
	302	kind = adm1021;
	303	else if (i == 0x49)
	304	kind = thmc10;
	305	else if (i == 0x23)
	306	kind = gl523sm;
	307	else if ((i == 0x4d) &&
c83c41e4 KH	308	(i2c_smbus_read_byte_data(client,
c83c41e4 KH	309	ADM1021_REG_DEV_ID) == 0x01))
1da177e4 LT	310	kind = max1617a;
	311	else if (i == 0x54)
	312	kind = mc1066;
	313	/* LM84 Mfr ID in a different place, and it has more unused bits */
c83c41e4 KH	314	else if (conv_rate == 0x00
	315	&& (kind == 0 /* skip extra detection */
	316	\|\| ((config & 0x7F) == 0x00
	317	&& (status & 0xAB) == 0x00)))
1da177e4 LT	318	kind = lm84;
	319	else
	320	kind = max1617;
	321	}
	322
	323	if (kind == max1617) {
	324	type_name = "max1617";
	325	} else if (kind == max1617a) {
	326	type_name = "max1617a";
	327	} else if (kind == adm1021) {
	328	type_name = "adm1021";
	329	} else if (kind == adm1023) {
	330	type_name = "adm1023";
	331	} else if (kind == thmc10) {
	332	type_name = "thmc10";
	333	} else if (kind == lm84) {
	334	type_name = "lm84";
	335	} else if (kind == gl523sm) {
	336	type_name = "gl523sm";
	337	} else if (kind == mc1066) {
	338	type_name = "mc1066";
	339	}
c83c41e4 KH	340	pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
c83c41e4 KH	341	type_name, i2c_adapter_id(adapter), address);
1da177e4	342
c83c41e4 KH	343	/* Fill in the remaining client fields */
c83c41e4 KH	344	strlcpy(client->name, type_name, I2C_NAME_SIZE);
1da177e4	345	data->type = kind;
9a61bf63	346	mutex_init(&data->update_lock);
1da177e4 LT	347
1da177e4 LT	348	/* Tell the I2C layer a new client has arrived */
c83c41e4	349	if ((err = i2c_attach_client(client)))
1da177e4 LT	350	goto error1;
	351
	352	/* Initialize the ADM1021 chip */
c83c41e4 KH	353	if (kind != lm84 && !read_only)
c83c41e4 KH	354	adm1021_init_client(client);
1da177e4 LT	355
1da177e4 LT	356	/* Register sysfs hooks */
c83c41e4	357	if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
681c6f7a MH	358	goto error2;
681c6f7a MH	359
1beeffe4 TJ	360	data->hwmon_dev = hwmon_device_register(&client->dev);
	361	if (IS_ERR(data->hwmon_dev)) {
	362	err = PTR_ERR(data->hwmon_dev);
681c6f7a	363	goto error3;
943b0830 MH	364	}
943b0830 MH	365
1da177e4 LT	366	return 0;
1da177e4 LT	367
681c6f7a	368	error3:
c83c41e4	369	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
943b0830	370	error2:
c83c41e4	371	i2c_detach_client(client);
1da177e4 LT	372	error1:
	373	kfree(data);
	374	error0:
	375	return err;
	376	}
	377
	378	static void adm1021_init_client(struct i2c_client *client)
	379	{
	380	/* Enable ADC and disable suspend mode */
c83c41e4 KH	381	i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
c83c41e4 KH	382	i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
1da177e4	383	/* Set Conversion rate to 1/sec (this can be tinkered with) */
c83c41e4	384	i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
1da177e4 LT	385	}
	386
	387	static int adm1021_detach_client(struct i2c_client *client)
	388	{
943b0830	389	struct adm1021_data *data = i2c_get_clientdata(client);
1da177e4 LT	390	int err;
1da177e4 LT	391
1beeffe4	392	hwmon_device_unregister(data->hwmon_dev);
681c6f7a	393	sysfs_remove_group(&client->dev.kobj, &adm1021_group);
943b0830	394
7bef5594	395	if ((err = i2c_detach_client(client)))
1da177e4	396	return err;
1da177e4	397
943b0830	398	kfree(data);
1da177e4 LT	399	return 0;
	400	}
	401
1da177e4 LT	402	static struct adm1021_data adm1021_update_device(struct device dev)
	403	{
	404	struct i2c_client *client = to_i2c_client(dev);
	405	struct adm1021_data *data = i2c_get_clientdata(client);
	406
9a61bf63	407	mutex_lock(&data->update_lock);
1da177e4 LT	408
	409	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	410	\|\| !data->valid) {
a8d6646e KH	411	int i;
a8d6646e KH	412
1da177e4 LT	413	dev_dbg(&client->dev, "Starting adm1021 update\n");
1da177e4 LT	414
a8d6646e KH	415	for (i = 0; i < 2; i++) {
	416	data->temp[i] = i2c_smbus_read_byte_data(client,
	417	ADM1021_REG_TEMP(i));
	418	data->temp_max[i] = i2c_smbus_read_byte_data(client,
	419	ADM1021_REG_TOS_R(i));
	420	data->temp_min[i] = i2c_smbus_read_byte_data(client,
	421	ADM1021_REG_THYST_R(i));
	422	}
c83c41e4 KH	423	data->alarms = i2c_smbus_read_byte_data(client,
c83c41e4 KH	424	ADM1021_REG_STATUS) & 0x7c;
1da177e4	425	if (data->type == adm1023) {
c83c41e4 KH	426	data->remote_temp_prec =
	427	i2c_smbus_read_byte_data(client,
	428	ADM1023_REG_REM_TEMP_PREC);
	429	data->remote_temp_os_prec =
	430	i2c_smbus_read_byte_data(client,
	431	ADM1023_REG_REM_TOS_PREC);
	432	data->remote_temp_hyst_prec =
	433	i2c_smbus_read_byte_data(client,
	434	ADM1023_REG_REM_THYST_PREC);
	435	data->remote_temp_offset =
	436	i2c_smbus_read_byte_data(client,
	437	ADM1023_REG_REM_OFFSET);
	438	data->remote_temp_offset_prec =
	439	i2c_smbus_read_byte_data(client,
	440	ADM1023_REG_REM_OFFSET_PREC);
1da177e4 LT	441	}
	442	data->last_updated = jiffies;
	443	data->valid = 1;
	444	}
	445
9a61bf63	446	mutex_unlock(&data->update_lock);
1da177e4 LT	447
	448	return data;
	449	}
	450
	451	static int __init sensors_adm1021_init(void)
	452	{
	453	return i2c_add_driver(&adm1021_driver);
	454	}
	455
	456	static void __exit sensors_adm1021_exit(void)
	457	{
	458	i2c_del_driver(&adm1021_driver);
	459	}
	460
	461	MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
	462	"Philip Edelbrock <phil@netroedge.com>");
	463	MODULE_DESCRIPTION("adm1021 driver");
	464	MODULE_LICENSE("GPL");
	465
	466	module_param(read_only, bool, 0);
	467	MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
	468
	469	module_init(sensors_adm1021_init)
	470	module_exit(sensors_adm1021_exit)