[net-next-2.6.git] / drivers / hwmon / max1619.c

/*
 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
 *                         Jean Delvare <khali@linux-fr.org>
 *
 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
 * It reports up to two temperatures (its own plus up to
 * one external one). Complete datasheet can be
 * obtained from Maxim's website at:
 *   http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>

static const unsigned short normal_i2c[] = {
	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };

/*
 * The MAX1619 registers
 */

#define MAX1619_REG_R_MAN_ID		0xFE
#define MAX1619_REG_R_CHIP_ID		0xFF
#define MAX1619_REG_R_CONFIG		0x03
#define MAX1619_REG_W_CONFIG		0x09
#define MAX1619_REG_R_CONVRATE		0x04
#define MAX1619_REG_W_CONVRATE		0x0A
#define MAX1619_REG_R_STATUS		0x02
#define MAX1619_REG_R_LOCAL_TEMP	0x00
#define MAX1619_REG_R_REMOTE_TEMP	0x01
#define MAX1619_REG_R_REMOTE_HIGH	0x07
#define MAX1619_REG_W_REMOTE_HIGH	0x0D
#define MAX1619_REG_R_REMOTE_LOW	0x08
#define MAX1619_REG_W_REMOTE_LOW	0x0E
#define MAX1619_REG_R_REMOTE_CRIT	0x10
#define MAX1619_REG_W_REMOTE_CRIT	0x12
#define MAX1619_REG_R_TCRIT_HYST	0x11
#define MAX1619_REG_W_TCRIT_HYST	0x13

/*
 * Conversions
 */

static int temp_from_reg(int val)
{
	return (val & 0x80 ? val-0x100 : val) * 1000;
}

static int temp_to_reg(int val)
{
	return (val < 0 ? val+0x100*1000 : val) / 1000;
}

/*
 * Functions declaration
 */

static int max1619_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int max1619_detect(struct i2c_client *client,
			  struct i2c_board_info *info);
static void max1619_init_client(struct i2c_client *client);
static int max1619_remove(struct i2c_client *client);
static struct max1619_data *max1619_update_device(struct device *dev);

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id max1619_id[] = {
	{ "max1619", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max1619_id);

static struct i2c_driver max1619_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "max1619",
	},
	.probe		= max1619_probe,
	.remove		= max1619_remove,
	.id_table	= max1619_id,
	.detect		= max1619_detect,
	.address_list	= normal_i2c,
};

/*
 * Client data (each client gets its own)
 */

struct max1619_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	u8 temp_input1; /* local */
	u8 temp_input2, temp_low2, temp_high2; /* remote */
	u8 temp_crit2;
	u8 temp_hyst2;
	u8 alarms; 
};

/*
 * Sysfs stuff
 */

#define show_temp(value) \
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct max1619_data *data = max1619_update_device(dev); \
	return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
}
show_temp(temp_input1);
show_temp(temp_input2);
show_temp(temp_low2);
show_temp(temp_high2);
show_temp(temp_crit2);
show_temp(temp_hyst2);

#define set_temp2(value, reg) \
static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
	size_t count) \
{ \
	struct i2c_client *client = to_i2c_client(dev); \
	struct max1619_data *data = i2c_get_clientdata(client); \
	long val = simple_strtol(buf, NULL, 10); \
 \
	mutex_lock(&data->update_lock); \
	data->value = temp_to_reg(val); \
	i2c_smbus_write_byte_data(client, reg, data->value); \
	mutex_unlock(&data->update_lock); \
	return count; \
}

set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);

static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct max1619_data *data = max1619_update_device(dev);
	return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct max1619_data *data = max1619_update_device(dev);
	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
	set_temp_low2);
static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
	set_temp_high2);
static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
	set_temp_crit2);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
	set_temp_hyst2);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);

static struct attribute *max1619_attributes[] = {
	&dev_attr_temp1_input.attr,
	&dev_attr_temp2_input.attr,
	&dev_attr_temp2_min.attr,
	&dev_attr_temp2_max.attr,
	&dev_attr_temp2_crit.attr,
	&dev_attr_temp2_crit_hyst.attr,

	&dev_attr_alarms.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group max1619_group = {
	.attrs = max1619_attributes,
};

/*
 * Real code
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int max1619_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	/* detection */
	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
	if ((reg_config & 0x03) != 0x00
	 || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
		dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
			client->addr);
		return -ENODEV;
	}

	/* identification */
	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
	if (man_id != 0x4D || chip_id != 0x04) {
		dev_info(&adapter->dev,
			 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
			 man_id, chip_id);
		return -ENODEV;
	}

	strlcpy(info->type, "max1619", I2C_NAME_SIZE);

	return 0;
}

static int max1619_probe(struct i2c_client *new_client,
			 const struct i2c_device_id *id)
{
	struct max1619_data *data;
	int err;

	data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(new_client, data);
	data->valid = 0;
	mutex_init(&data->update_lock);

	/* Initialize the MAX1619 chip */
	max1619_init_client(new_client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
		goto exit_free;

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

	return 0;

exit_remove_files:
	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
exit_free:
	kfree(data);
exit:
	return err;
}

static void max1619_init_client(struct i2c_client *client)
{
	u8 config;

	/*
	 * Start the conversions.
	 */
	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
				  5); /* 2 Hz */
	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	if (config & 0x40)
		i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
					  config & 0xBF); /* run */
}

static int max1619_remove(struct i2c_client *client)
{
	struct max1619_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &max1619_group);

	kfree(data);
	return 0;
}

static struct max1619_data *max1619_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct max1619_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
		dev_dbg(&client->dev, "Updating max1619 data.\n");
		data->temp_input1 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_LOCAL_TEMP);
		data->temp_input2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_TEMP);
		data->temp_high2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_HIGH);
		data->temp_low2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_LOW);
		data->temp_crit2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_CRIT);
		data->temp_hyst2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_TCRIT_HYST);
		data->alarms = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_STATUS);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sensors_max1619_init(void)
{
	return i2c_add_driver(&max1619_driver);
}

static void __exit sensors_max1619_exit(void)
{
	i2c_del_driver(&max1619_driver);
}

MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
	"Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("MAX1619 sensor driver");
MODULE_LICENSE("GPL");

module_init(sensors_max1619_init);
module_exit(sensors_max1619_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
	4	* Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
	5	* Jean Delvare <khali@linux-fr.org>
	6	*
	7	* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
	8	* It reports up to two temperatures (its own plus up to
	9	* one external one). Complete datasheet can be
	10	* obtained from Maxim's website at:
	11	* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	26	*/
	27
	28
1da177e4 LT	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/slab.h>
	32	#include <linux/jiffies.h>
	33	#include <linux/i2c.h>
943b0830	34	#include <linux/hwmon.h>
71062ffc	35	#include <linux/hwmon-sysfs.h>
943b0830	36	#include <linux/err.h>
9a61bf63	37	#include <linux/mutex.h>
a5ebe668	38	#include <linux/sysfs.h>
1da177e4	39
25e9c86d MH	40	static const unsigned short normal_i2c[] = {
25e9c86d MH	41	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	42
1da177e4 LT	43	/*
	44	* The MAX1619 registers
	45	*/
	46
	47	#define MAX1619_REG_R_MAN_ID 0xFE
	48	#define MAX1619_REG_R_CHIP_ID 0xFF
	49	#define MAX1619_REG_R_CONFIG 0x03
	50	#define MAX1619_REG_W_CONFIG 0x09
	51	#define MAX1619_REG_R_CONVRATE 0x04
	52	#define MAX1619_REG_W_CONVRATE 0x0A
	53	#define MAX1619_REG_R_STATUS 0x02
	54	#define MAX1619_REG_R_LOCAL_TEMP 0x00
	55	#define MAX1619_REG_R_REMOTE_TEMP 0x01
	56	#define MAX1619_REG_R_REMOTE_HIGH 0x07
	57	#define MAX1619_REG_W_REMOTE_HIGH 0x0D
	58	#define MAX1619_REG_R_REMOTE_LOW 0x08
	59	#define MAX1619_REG_W_REMOTE_LOW 0x0E
	60	#define MAX1619_REG_R_REMOTE_CRIT 0x10
	61	#define MAX1619_REG_W_REMOTE_CRIT 0x12
	62	#define MAX1619_REG_R_TCRIT_HYST 0x11
	63	#define MAX1619_REG_W_TCRIT_HYST 0x13
	64
	65	/*
a80e8ee6	66	* Conversions
1da177e4 LT	67	*/
1da177e4 LT	68
a80e8ee6 AM	69	static int temp_from_reg(int val)
	70	{
	71	return (val & 0x80 ? val-0x100 : val) * 1000;
	72	}
	73
	74	static int temp_to_reg(int val)
	75	{
	76	return (val < 0 ? val+0x100*1000 : val) / 1000;
	77	}
1da177e4 LT	78
	79	/*
	80	* Functions declaration
	81	*/
	82
c6d3f6fa JD	83	static int max1619_probe(struct i2c_client *client,
c6d3f6fa JD	84	const struct i2c_device_id *id);
310ec792	85	static int max1619_detect(struct i2c_client *client,
c6d3f6fa	86	struct i2c_board_info *info);
1da177e4	87	static void max1619_init_client(struct i2c_client *client);
c6d3f6fa	88	static int max1619_remove(struct i2c_client *client);
1da177e4 LT	89	static struct max1619_data max1619_update_device(struct device dev);
	90
	91	/*
	92	* Driver data (common to all clients)
	93	*/
	94
c6d3f6fa	95	static const struct i2c_device_id max1619_id[] = {
1f86df49	96	{ "max1619", 0 },
c6d3f6fa JD	97	{ }
	98	};
	99	MODULE_DEVICE_TABLE(i2c, max1619_id);
	100
1da177e4	101	static struct i2c_driver max1619_driver = {
c6d3f6fa	102	.class = I2C_CLASS_HWMON,
cdaf7934	103	.driver = {
cdaf7934 LR	104	.name = "max1619",
cdaf7934 LR	105	},
c6d3f6fa JD	106	.probe = max1619_probe,
	107	.remove = max1619_remove,
	108	.id_table = max1619_id,
	109	.detect = max1619_detect,
c3813d6a	110	.address_list = normal_i2c,
1da177e4 LT	111	};
	112
	113	/*
	114	* Client data (each client gets its own)
	115	*/
	116
	117	struct max1619_data {
1beeffe4	118	struct device *hwmon_dev;
9a61bf63	119	struct mutex update_lock;
1da177e4 LT	120	char valid; /* zero until following fields are valid */
	121	unsigned long last_updated; /* in jiffies */
	122
	123	/* registers values */
	124	u8 temp_input1; /* local */
	125	u8 temp_input2, temp_low2, temp_high2; /* remote */
	126	u8 temp_crit2;
	127	u8 temp_hyst2;
	128	u8 alarms;
	129	};
	130
	131	/*
	132	* Sysfs stuff
	133	*/
	134
	135	#define show_temp(value) \
8627f9ba	136	static ssize_t show_##value(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	137	{ \
1da177e4 LT	138	struct max1619_data *data = max1619_update_device(dev); \
a80e8ee6	139	return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
1da177e4 LT	140	}
	141	show_temp(temp_input1);
	142	show_temp(temp_input2);
	143	show_temp(temp_low2);
	144	show_temp(temp_high2);
	145	show_temp(temp_crit2);
	146	show_temp(temp_hyst2);
	147
	148	#define set_temp2(value, reg) \
8627f9ba	149	static ssize_t set_##value(struct device dev, struct device_attribute attr, const char *buf, \
1da177e4 LT	150	size_t count) \
	151	{ \
	152	struct i2c_client *client = to_i2c_client(dev); \
	153	struct max1619_data *data = i2c_get_clientdata(client); \
	154	long val = simple_strtol(buf, NULL, 10); \
	155	\
9a61bf63	156	mutex_lock(&data->update_lock); \
a80e8ee6	157	data->value = temp_to_reg(val); \
1da177e4	158	i2c_smbus_write_byte_data(client, reg, data->value); \
9a61bf63	159	mutex_unlock(&data->update_lock); \
1da177e4 LT	160	return count; \
	161	}
	162
	163	set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
	164	set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
	165	set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
	166	set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
	167
8627f9ba	168	static ssize_t show_alarms(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	169	{
	170	struct max1619_data *data = max1619_update_device(dev);
	171	return sprintf(buf, "%d\n", data->alarms);
	172	}
	173
71062ffc JD	174	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	175	char *buf)
	176	{
	177	int bitnr = to_sensor_dev_attr(attr)->index;
	178	struct max1619_data *data = max1619_update_device(dev);
	179	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	180	}
	181
1da177e4 LT	182	static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
	183	static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
	184	static DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_low2,
	185	set_temp_low2);
	186	static DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_high2,
	187	set_temp_high2);
	188	static DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit2,
	189	set_temp_crit2);
	190	static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_temp_hyst2,
	191	set_temp_hyst2);
	192	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
71062ffc JD	193	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
	194	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	195	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	196	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1da177e4	197
a5ebe668 JD	198	static struct attribute *max1619_attributes[] = {
	199	&dev_attr_temp1_input.attr,
	200	&dev_attr_temp2_input.attr,
	201	&dev_attr_temp2_min.attr,
	202	&dev_attr_temp2_max.attr,
	203	&dev_attr_temp2_crit.attr,
	204	&dev_attr_temp2_crit_hyst.attr,
	205
	206	&dev_attr_alarms.attr,
71062ffc JD	207	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	208	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	209	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	210	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
a5ebe668 JD	211	NULL
	212	};
	213
	214	static const struct attribute_group max1619_group = {
	215	.attrs = max1619_attributes,
	216	};
	217
1da177e4 LT	218	/*
	219	* Real code
	220	*/
	221
c6d3f6fa	222	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	223	static int max1619_detect(struct i2c_client *client,
c6d3f6fa	224	struct i2c_board_info *info)
1da177e4	225	{
52df6440 JD	226	struct i2c_adapter *adapter = client->adapter;
52df6440 JD	227	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
b0020e3f	228
1da177e4	229	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
c6d3f6fa	230	return -ENODEV;
1da177e4	231
52df6440 JD	232	/* detection */
	233	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	234	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
	235	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
	236	if ((reg_config & 0x03) != 0x00
	237	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61) != 0x00) {
	238	dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
	239	client->addr);
	240	return -ENODEV;
1da177e4 LT	241	}
1da177e4 LT	242
52df6440 JD	243	/* identification */
	244	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
	245	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
	246	if (man_id != 0x4D \|\| chip_id != 0x04) {
	247	dev_info(&adapter->dev,
	248	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
	249	man_id, chip_id);
	250	return -ENODEV;
b0020e3f	251	}
1da177e4	252
c6d3f6fa JD	253	strlcpy(info->type, "max1619", I2C_NAME_SIZE);
	254
	255	return 0;
	256	}
	257
	258	static int max1619_probe(struct i2c_client *new_client,
	259	const struct i2c_device_id *id)
	260	{
	261	struct max1619_data *data;
	262	int err;
	263
	264	data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
	265	if (!data) {
	266	err = -ENOMEM;
	267	goto exit;
	268	}
1da177e4	269
c6d3f6fa	270	i2c_set_clientdata(new_client, data);
1da177e4	271	data->valid = 0;
9a61bf63	272	mutex_init(&data->update_lock);
1da177e4	273
1da177e4 LT	274	/* Initialize the MAX1619 chip */
	275	max1619_init_client(new_client);
	276
	277	/* Register sysfs hooks */
a5ebe668	278	if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
c6d3f6fa	279	goto exit_free;
a5ebe668	280
1beeffe4 TJ	281	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	282	if (IS_ERR(data->hwmon_dev)) {
	283	err = PTR_ERR(data->hwmon_dev);
a5ebe668	284	goto exit_remove_files;
943b0830 MH	285	}
943b0830 MH	286
1da177e4 LT	287	return 0;
1da177e4 LT	288
a5ebe668 JD	289	exit_remove_files:
a5ebe668 JD	290	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
1da177e4 LT	291	exit_free:
	292	kfree(data);
	293	exit:
	294	return err;
	295	}
	296
	297	static void max1619_init_client(struct i2c_client *client)
	298	{
	299	u8 config;
	300
	301	/*
	302	* Start the conversions.
	303	*/
	304	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
	305	5); /* 2 Hz */
	306	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	307	if (config & 0x40)
	308	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
	309	config & 0xBF); /* run */
	310	}
	311
c6d3f6fa	312	static int max1619_remove(struct i2c_client *client)
1da177e4	313	{
943b0830	314	struct max1619_data *data = i2c_get_clientdata(client);
1da177e4	315
1beeffe4	316	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	317	sysfs_remove_group(&client->dev.kobj, &max1619_group);
943b0830	318
943b0830	319	kfree(data);
1da177e4 LT	320	return 0;
	321	}
	322
	323	static struct max1619_data max1619_update_device(struct device dev)
	324	{
	325	struct i2c_client *client = to_i2c_client(dev);
	326	struct max1619_data *data = i2c_get_clientdata(client);
	327
9a61bf63	328	mutex_lock(&data->update_lock);
1da177e4 LT	329
	330	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	331	dev_dbg(&client->dev, "Updating max1619 data.\n");
	332	data->temp_input1 = i2c_smbus_read_byte_data(client,
	333	MAX1619_REG_R_LOCAL_TEMP);
	334	data->temp_input2 = i2c_smbus_read_byte_data(client,
	335	MAX1619_REG_R_REMOTE_TEMP);
	336	data->temp_high2 = i2c_smbus_read_byte_data(client,
	337	MAX1619_REG_R_REMOTE_HIGH);
	338	data->temp_low2 = i2c_smbus_read_byte_data(client,
	339	MAX1619_REG_R_REMOTE_LOW);
	340	data->temp_crit2 = i2c_smbus_read_byte_data(client,
	341	MAX1619_REG_R_REMOTE_CRIT);
	342	data->temp_hyst2 = i2c_smbus_read_byte_data(client,
	343	MAX1619_REG_R_TCRIT_HYST);
	344	data->alarms = i2c_smbus_read_byte_data(client,
	345	MAX1619_REG_R_STATUS);
	346
	347	data->last_updated = jiffies;
	348	data->valid = 1;
	349	}
	350
9a61bf63	351	mutex_unlock(&data->update_lock);
1da177e4 LT	352
	353	return data;
	354	}
	355
	356	static int __init sensors_max1619_init(void)
	357	{
	358	return i2c_add_driver(&max1619_driver);
	359	}
	360
	361	static void __exit sensors_max1619_exit(void)
	362	{
	363	i2c_del_driver(&max1619_driver);
	364	}
	365
368609c5	366	MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
1da177e4 LT	367	"Jean Delvare <khali@linux-fr.org>");
	368	MODULE_DESCRIPTION("MAX1619 sensor driver");
	369	MODULE_LICENSE("GPL");
	370
	371	module_init(sensors_max1619_init);
	372	module_exit(sensors_max1619_exit);