[linux-2.6-block.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 };

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_1(max1619);

/*
 * 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 and various macros
 */

#define TEMP_FROM_REG(val)	((val & 0x80 ? val-0x100 : val) * 1000)
#define TEMP_TO_REG(val)	((val < 0 ? val+0x100*1000 : val) / 1000)

/*
 * Functions declaration
 */

static int max1619_attach_adapter(struct i2c_adapter *adapter);
static int max1619_detect(struct i2c_adapter *adapter, int address,
	int kind);
static void max1619_init_client(struct i2c_client *client);
static int max1619_detach_client(struct i2c_client *client);
static struct max1619_data *max1619_update_device(struct device *dev);

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

static struct i2c_driver max1619_driver = {
	.driver = {
		.name	= "max1619",
	},
	.attach_adapter	= max1619_attach_adapter,
	.detach_client	= max1619_detach_client,
};

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

struct max1619_data {
	struct i2c_client client;
	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
 */

static int max1619_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, max1619_detect);
}

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */
static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct max1619_data *data;
	int err = 0;
	const char *name = "";	
	u8 reg_config=0, reg_convrate=0, reg_status=0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

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

	/* The common I2C client data is placed right before the
	   MAX1619-specific data. */
	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &max1619_driver;
	new_client->flags = 0;

	/*
	 * Now we do the remaining detection. A negative kind means that
	 * the driver was loaded with no force parameter (default), so we
	 * must both detect and identify the chip. A zero kind means that
	 * the driver was loaded with the force parameter, the detection
	 * step shall be skipped. A positive kind means that the driver
	 * was loaded with the force parameter and a given kind of chip is
	 * requested, so both the detection and the identification steps
	 * are skipped.
	 */
	if (kind < 0) { /* detection */
		reg_config = i2c_smbus_read_byte_data(new_client,
			      MAX1619_REG_R_CONFIG);
		reg_convrate = i2c_smbus_read_byte_data(new_client,
			       MAX1619_REG_R_CONVRATE);
		reg_status = i2c_smbus_read_byte_data(new_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",
				address);
			goto exit_free;
		}
	}

	if (kind <= 0) { /* identification */
		u8 man_id, chip_id;
	
		man_id = i2c_smbus_read_byte_data(new_client,
			 MAX1619_REG_R_MAN_ID);
		chip_id = i2c_smbus_read_byte_data(new_client,
			  MAX1619_REG_R_CHIP_ID);
		
		if ((man_id == 0x4D) && (chip_id == 0x04))
			kind = max1619;

		if (kind <= 0) { /* identification failed */
			dev_info(&adapter->dev,
			    "Unsupported chip (man_id=0x%02X, "
			    "chip_id=0x%02X).\n", man_id, chip_id);
			goto exit_free;
		}
	}

	if (kind == max1619)
		name = "max1619";

	/* We can fill in the remaining client fields */
	strlcpy(new_client->name, name, I2C_NAME_SIZE);
	data->valid = 0;
	mutex_init(&data->update_lock);

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

	/* 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_detach;

	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_detach:
	i2c_detach_client(new_client);
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_detach_client(struct i2c_client *client)
{
	struct max1619_data *data = i2c_get_clientdata(client);
	int err;

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

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

	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 LT	42
	43	/*
	44	* Insmod parameters
	45	*/
	46
f4b50261	47	I2C_CLIENT_INSMOD_1(max1619);
1da177e4 LT	48
	49	/*
	50	* The MAX1619 registers
	51	*/
	52
	53	#define MAX1619_REG_R_MAN_ID 0xFE
	54	#define MAX1619_REG_R_CHIP_ID 0xFF
	55	#define MAX1619_REG_R_CONFIG 0x03
	56	#define MAX1619_REG_W_CONFIG 0x09
	57	#define MAX1619_REG_R_CONVRATE 0x04
	58	#define MAX1619_REG_W_CONVRATE 0x0A
	59	#define MAX1619_REG_R_STATUS 0x02
	60	#define MAX1619_REG_R_LOCAL_TEMP 0x00
	61	#define MAX1619_REG_R_REMOTE_TEMP 0x01
	62	#define MAX1619_REG_R_REMOTE_HIGH 0x07
	63	#define MAX1619_REG_W_REMOTE_HIGH 0x0D
	64	#define MAX1619_REG_R_REMOTE_LOW 0x08
	65	#define MAX1619_REG_W_REMOTE_LOW 0x0E
	66	#define MAX1619_REG_R_REMOTE_CRIT 0x10
	67	#define MAX1619_REG_W_REMOTE_CRIT 0x12
	68	#define MAX1619_REG_R_TCRIT_HYST 0x11
	69	#define MAX1619_REG_W_TCRIT_HYST 0x13
	70
	71	/*
	72	* Conversions and various macros
	73	*/
	74
	75	#define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000)
	76	#define TEMP_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000)
	77
	78	/*
	79	* Functions declaration
	80	*/
	81
	82	static int max1619_attach_adapter(struct i2c_adapter *adapter);
	83	static int max1619_detect(struct i2c_adapter *adapter, int address,
	84	int kind);
	85	static void max1619_init_client(struct i2c_client *client);
	86	static int max1619_detach_client(struct i2c_client *client);
	87	static struct max1619_data max1619_update_device(struct device dev);
	88
	89	/*
	90	* Driver data (common to all clients)
	91	*/
	92
	93	static struct i2c_driver max1619_driver = {
cdaf7934	94	.driver = {
cdaf7934 LR	95	.name = "max1619",
cdaf7934 LR	96	},
1da177e4 LT	97	.attach_adapter = max1619_attach_adapter,
	98	.detach_client = max1619_detach_client,
	99	};
	100
	101	/*
	102	* Client data (each client gets its own)
	103	*/
	104
	105	struct max1619_data {
	106	struct i2c_client client;
1beeffe4	107	struct device *hwmon_dev;
9a61bf63	108	struct mutex update_lock;
1da177e4 LT	109	char valid; /* zero until following fields are valid */
	110	unsigned long last_updated; /* in jiffies */
	111
	112	/* registers values */
	113	u8 temp_input1; /* local */
	114	u8 temp_input2, temp_low2, temp_high2; /* remote */
	115	u8 temp_crit2;
	116	u8 temp_hyst2;
	117	u8 alarms;
	118	};
	119
	120	/*
	121	* Sysfs stuff
	122	*/
	123
	124	#define show_temp(value) \
8627f9ba	125	static ssize_t show_##value(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	126	{ \
	127	struct max1619_data *data = max1619_update_device(dev); \
	128	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
	129	}
	130	show_temp(temp_input1);
	131	show_temp(temp_input2);
	132	show_temp(temp_low2);
	133	show_temp(temp_high2);
	134	show_temp(temp_crit2);
	135	show_temp(temp_hyst2);
	136
	137	#define set_temp2(value, reg) \
8627f9ba	138	static ssize_t set_##value(struct device dev, struct device_attribute attr, const char *buf, \
1da177e4 LT	139	size_t count) \
	140	{ \
	141	struct i2c_client *client = to_i2c_client(dev); \
	142	struct max1619_data *data = i2c_get_clientdata(client); \
	143	long val = simple_strtol(buf, NULL, 10); \
	144	\
9a61bf63	145	mutex_lock(&data->update_lock); \
1da177e4 LT	146	data->value = TEMP_TO_REG(val); \
1da177e4 LT	147	i2c_smbus_write_byte_data(client, reg, data->value); \
9a61bf63	148	mutex_unlock(&data->update_lock); \
1da177e4 LT	149	return count; \
	150	}
	151
	152	set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
	153	set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
	154	set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
	155	set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
	156
8627f9ba	157	static ssize_t show_alarms(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	158	{
	159	struct max1619_data *data = max1619_update_device(dev);
	160	return sprintf(buf, "%d\n", data->alarms);
	161	}
	162
71062ffc JD	163	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	164	char *buf)
	165	{
	166	int bitnr = to_sensor_dev_attr(attr)->index;
	167	struct max1619_data *data = max1619_update_device(dev);
	168	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	169	}
	170
1da177e4 LT	171	static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
	172	static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
	173	static DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_low2,
	174	set_temp_low2);
	175	static DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_high2,
	176	set_temp_high2);
	177	static DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit2,
	178	set_temp_crit2);
	179	static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_temp_hyst2,
	180	set_temp_hyst2);
	181	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
71062ffc JD	182	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
	183	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	184	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	185	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1da177e4	186
a5ebe668 JD	187	static struct attribute *max1619_attributes[] = {
	188	&dev_attr_temp1_input.attr,
	189	&dev_attr_temp2_input.attr,
	190	&dev_attr_temp2_min.attr,
	191	&dev_attr_temp2_max.attr,
	192	&dev_attr_temp2_crit.attr,
	193	&dev_attr_temp2_crit_hyst.attr,
	194
	195	&dev_attr_alarms.attr,
71062ffc JD	196	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	197	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	198	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	199	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
a5ebe668 JD	200	NULL
	201	};
	202
	203	static const struct attribute_group max1619_group = {
	204	.attrs = max1619_attributes,
	205	};
	206
1da177e4 LT	207	/*
	208	* Real code
	209	*/
	210
	211	static int max1619_attach_adapter(struct i2c_adapter *adapter)
	212	{
	213	if (!(adapter->class & I2C_CLASS_HWMON))
	214	return 0;
2ed2dc3c	215	return i2c_probe(adapter, &addr_data, max1619_detect);
1da177e4 LT	216	}
	217
	218	/*
	219	* The following function does more than just detection. If detection
	220	* succeeds, it also registers the new chip.
	221	*/
	222	static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
	223	{
	224	struct i2c_client *new_client;
	225	struct max1619_data *data;
	226	int err = 0;
	227	const char *name = "";
	228	u8 reg_config=0, reg_convrate=0, reg_status=0;
b0020e3f	229
1da177e4 LT	230	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	231	goto exit;
	232
ba9c2e8d	233	if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
1da177e4 LT	234	err = -ENOMEM;
	235	goto exit;
	236	}
1da177e4 LT	237
	238	/* The common I2C client data is placed right before the
	239	MAX1619-specific data. */
	240	new_client = &data->client;
	241	i2c_set_clientdata(new_client, data);
	242	new_client->addr = address;
	243	new_client->adapter = adapter;
	244	new_client->driver = &max1619_driver;
	245	new_client->flags = 0;
	246
	247	/*
	248	* Now we do the remaining detection. A negative kind means that
	249	* the driver was loaded with no force parameter (default), so we
	250	* must both detect and identify the chip. A zero kind means that
	251	* the driver was loaded with the force parameter, the detection
	252	* step shall be skipped. A positive kind means that the driver
	253	* was loaded with the force parameter and a given kind of chip is
	254	* requested, so both the detection and the identification steps
	255	* are skipped.
	256	*/
	257	if (kind < 0) { /* detection */
	258	reg_config = i2c_smbus_read_byte_data(new_client,
	259	MAX1619_REG_R_CONFIG);
	260	reg_convrate = i2c_smbus_read_byte_data(new_client,
	261	MAX1619_REG_R_CONVRATE);
	262	reg_status = i2c_smbus_read_byte_data(new_client,
	263	MAX1619_REG_R_STATUS);
	264	if ((reg_config & 0x03) != 0x00
	265	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61 ) !=0x00) {
	266	dev_dbg(&adapter->dev,
	267	"MAX1619 detection failed at 0x%02x.\n",
	268	address);
	269	goto exit_free;
	270	}
	271	}
	272
	273	if (kind <= 0) { /* identification */
b0020e3f	274	u8 man_id, chip_id;
1da177e4 LT	275
	276	man_id = i2c_smbus_read_byte_data(new_client,
	277	MAX1619_REG_R_MAN_ID);
	278	chip_id = i2c_smbus_read_byte_data(new_client,
	279	MAX1619_REG_R_CHIP_ID);
	280
b0020e3f AM	281	if ((man_id == 0x4D) && (chip_id == 0x04))
b0020e3f AM	282	kind = max1619;
1da177e4 LT	283
	284	if (kind <= 0) { /* identification failed */
	285	dev_info(&adapter->dev,
	286	"Unsupported chip (man_id=0x%02X, "
	287	"chip_id=0x%02X).\n", man_id, chip_id);
	288	goto exit_free;
	289	}
b0020e3f	290	}
1da177e4	291
b0020e3f	292	if (kind == max1619)
1da177e4	293	name = "max1619";
1da177e4 LT	294
	295	/* We can fill in the remaining client fields */
	296	strlcpy(new_client->name, name, I2C_NAME_SIZE);
	297	data->valid = 0;
9a61bf63	298	mutex_init(&data->update_lock);
1da177e4 LT	299
	300	/* Tell the I2C layer a new client has arrived */
	301	if ((err = i2c_attach_client(new_client)))
	302	goto exit_free;
	303
	304	/* Initialize the MAX1619 chip */
	305	max1619_init_client(new_client);
	306
	307	/* Register sysfs hooks */
a5ebe668 JD	308	if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
	309	goto exit_detach;
	310
1beeffe4 TJ	311	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	312	if (IS_ERR(data->hwmon_dev)) {
	313	err = PTR_ERR(data->hwmon_dev);
a5ebe668	314	goto exit_remove_files;
943b0830 MH	315	}
943b0830 MH	316
1da177e4 LT	317	return 0;
1da177e4 LT	318
a5ebe668 JD	319	exit_remove_files:
a5ebe668 JD	320	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
943b0830 MH	321	exit_detach:
943b0830 MH	322	i2c_detach_client(new_client);
1da177e4 LT	323	exit_free:
	324	kfree(data);
	325	exit:
	326	return err;
	327	}
	328
	329	static void max1619_init_client(struct i2c_client *client)
	330	{
	331	u8 config;
	332
	333	/*
	334	* Start the conversions.
	335	*/
	336	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
	337	5); /* 2 Hz */
	338	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	339	if (config & 0x40)
	340	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
	341	config & 0xBF); /* run */
	342	}
	343
	344	static int max1619_detach_client(struct i2c_client *client)
	345	{
943b0830	346	struct max1619_data *data = i2c_get_clientdata(client);
1da177e4 LT	347	int err;
1da177e4 LT	348
1beeffe4	349	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	350	sysfs_remove_group(&client->dev.kobj, &max1619_group);
943b0830	351
7bef5594	352	if ((err = i2c_detach_client(client)))
1da177e4	353	return err;
1da177e4	354
943b0830	355	kfree(data);
1da177e4 LT	356	return 0;
	357	}
	358
	359	static struct max1619_data max1619_update_device(struct device dev)
	360	{
	361	struct i2c_client *client = to_i2c_client(dev);
	362	struct max1619_data *data = i2c_get_clientdata(client);
	363
9a61bf63	364	mutex_lock(&data->update_lock);
1da177e4 LT	365
	366	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	367	dev_dbg(&client->dev, "Updating max1619 data.\n");
	368	data->temp_input1 = i2c_smbus_read_byte_data(client,
	369	MAX1619_REG_R_LOCAL_TEMP);
	370	data->temp_input2 = i2c_smbus_read_byte_data(client,
	371	MAX1619_REG_R_REMOTE_TEMP);
	372	data->temp_high2 = i2c_smbus_read_byte_data(client,
	373	MAX1619_REG_R_REMOTE_HIGH);
	374	data->temp_low2 = i2c_smbus_read_byte_data(client,
	375	MAX1619_REG_R_REMOTE_LOW);
	376	data->temp_crit2 = i2c_smbus_read_byte_data(client,
	377	MAX1619_REG_R_REMOTE_CRIT);
	378	data->temp_hyst2 = i2c_smbus_read_byte_data(client,
	379	MAX1619_REG_R_TCRIT_HYST);
	380	data->alarms = i2c_smbus_read_byte_data(client,
	381	MAX1619_REG_R_STATUS);
	382
	383	data->last_updated = jiffies;
	384	data->valid = 1;
	385	}
	386
9a61bf63	387	mutex_unlock(&data->update_lock);
1da177e4 LT	388
	389	return data;
	390	}
	391
	392	static int __init sensors_max1619_init(void)
	393	{
	394	return i2c_add_driver(&max1619_driver);
	395	}
	396
	397	static void __exit sensors_max1619_exit(void)
	398	{
	399	i2c_del_driver(&max1619_driver);
	400	}
	401
368609c5	402	MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
1da177e4 LT	403	"Jean Delvare <khali@linux-fr.org>");
	404	MODULE_DESCRIPTION("MAX1619 sensor driver");
	405	MODULE_LICENSE("GPL");
	406
	407	module_init(sensors_max1619_init);
	408	module_exit(sensors_max1619_exit);