[linux.git] / drivers / i2c / chips / max1619.c

/*
 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (C) 2003-2004 Alexey Fisher <[email protected]>
 *                         Jean Delvare <[email protected]>
 *
 * 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/i2c-sensor.h>


static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
					0x29, 0x2a, 0x2b,
					0x4c, 0x4d, 0x4e,
					I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };

/*
 * Insmod parameters
 */

SENSORS_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 = {
	.owner		= THIS_MODULE,
	.name		= "max1619",
	.flags		= I2C_DF_NOTIFY,
	.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 semaphore 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); \
 \
	down(&data->update_lock); \
	data->value = TEMP_TO_REG(val); \
	i2c_smbus_write_byte_data(client, reg, data->value); \
	up(&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 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);

/*
 * Real code
 */

static int max1619_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_detect(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;
	u8 man_id, chip_id;
	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

	if (!(data = kmalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}
	memset(data, 0, sizeof(struct max1619_data));

	/* 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 */
	
		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;
	init_MUTEX(&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 */
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_min);
	device_create_file(&new_client->dev, &dev_attr_temp2_max);
	device_create_file(&new_client->dev, &dev_attr_temp2_crit);
	device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
	device_create_file(&new_client->dev, &dev_attr_alarms);

	return 0;

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)
{
	int err;

	if ((err = i2c_detach_client(client))) {
		dev_err(&client->dev, "Client deregistration failed, "
			"client not detached.\n");
		return err;
	}

	kfree(i2c_get_clientdata(client));
	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);

	down(&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;
	}

	up(&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 <[email protected]> and"
	"Jean Delvare <[email protected]>");
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 <[email protected]>
	5	* Jean Delvare <[email protected]>
	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>
	34	#include <linux/i2c-sensor.h>
	35
	36
	37	static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
	38	0x29, 0x2a, 0x2b,
	39	0x4c, 0x4d, 0x4e,
	40	I2C_CLIENT_END };
	41	static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
	42
	43	/*
	44	* Insmod parameters
	45	*/
	46
	47	SENSORS_INSMOD_1(max1619);
	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 = {
94	.owner = THIS_MODULE,
95	.name = "max1619",
96	.flags = I2C_DF_NOTIFY,
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;
107	struct semaphore update_lock;
108	char valid; /* zero until following fields are valid */
109	unsigned long last_updated; /* in jiffies */
110
111	/* registers values */
112	u8 temp_input1; /* local */
113	u8 temp_input2, temp_low2, temp_high2; /* remote */
114	u8 temp_crit2;
115	u8 temp_hyst2;
116	u8 alarms;
117	};
118
119	/*
120	* Sysfs stuff
121	*/
122
123	#define show_temp(value) \
8627f9ba	124	static ssize_t show_##value(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	125	{ \
	126	struct max1619_data *data = max1619_update_device(dev); \
	127	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
	128	}
	129	show_temp(temp_input1);
	130	show_temp(temp_input2);
	131	show_temp(temp_low2);
	132	show_temp(temp_high2);
	133	show_temp(temp_crit2);
	134	show_temp(temp_hyst2);
	135
	136	#define set_temp2(value, reg) \
8627f9ba	137	static ssize_t set_##value(struct device dev, struct device_attribute attr, const char *buf, \
1da177e4 LT	138	size_t count) \
	139	{ \
	140	struct i2c_client *client = to_i2c_client(dev); \
	141	struct max1619_data *data = i2c_get_clientdata(client); \
	142	long val = simple_strtol(buf, NULL, 10); \
	143	\
	144	down(&data->update_lock); \
	145	data->value = TEMP_TO_REG(val); \
	146	i2c_smbus_write_byte_data(client, reg, data->value); \
	147	up(&data->update_lock); \
	148	return count; \
	149	}
	150
	151	set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
	152	set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
	153	set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
	154	set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
	155
8627f9ba	156	static ssize_t show_alarms(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	157	{
	158	struct max1619_data *data = max1619_update_device(dev);
	159	return sprintf(buf, "%d\n", data->alarms);
	160	}
	161
	162	static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
	163	static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
	164	static DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_low2,
	165	set_temp_low2);
	166	static DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_high2,
	167	set_temp_high2);
	168	static DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit2,
	169	set_temp_crit2);
	170	static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_temp_hyst2,
	171	set_temp_hyst2);
	172	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
	173
	174	/*
	175	* Real code
	176	*/
	177
	178	static int max1619_attach_adapter(struct i2c_adapter *adapter)
	179	{
	180	if (!(adapter->class & I2C_CLASS_HWMON))
	181	return 0;
	182	return i2c_detect(adapter, &addr_data, max1619_detect);
	183	}
	184
	185	/*
	186	* The following function does more than just detection. If detection
	187	* succeeds, it also registers the new chip.
	188	*/
	189	static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
	190	{
	191	struct i2c_client *new_client;
	192	struct max1619_data *data;
	193	int err = 0;
	194	const char *name = "";
	195	u8 reg_config=0, reg_convrate=0, reg_status=0;
	196	u8 man_id, chip_id;
	197	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	198	goto exit;
	199
	200	if (!(data = kmalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
	201	err = -ENOMEM;
	202	goto exit;
	203	}
	204	memset(data, 0, sizeof(struct max1619_data));
	205
	206	/* The common I2C client data is placed right before the
	207	MAX1619-specific data. */
	208	new_client = &data->client;
	209	i2c_set_clientdata(new_client, data);
	210	new_client->addr = address;
	211	new_client->adapter = adapter;
	212	new_client->driver = &max1619_driver;
	213	new_client->flags = 0;
	214
	215	/*
	216	* Now we do the remaining detection. A negative kind means that
	217	* the driver was loaded with no force parameter (default), so we
	218	* must both detect and identify the chip. A zero kind means that
	219	* the driver was loaded with the force parameter, the detection
	220	* step shall be skipped. A positive kind means that the driver
221	* was loaded with the force parameter and a given kind of chip is
222	* requested, so both the detection and the identification steps
223	* are skipped.
224	*/
225	if (kind < 0) { /* detection */
226	reg_config = i2c_smbus_read_byte_data(new_client,
227	MAX1619_REG_R_CONFIG);
228	reg_convrate = i2c_smbus_read_byte_data(new_client,
229	MAX1619_REG_R_CONVRATE);
230	reg_status = i2c_smbus_read_byte_data(new_client,
231	MAX1619_REG_R_STATUS);
232	if ((reg_config & 0x03) != 0x00
233	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61 ) !=0x00) {
234	dev_dbg(&adapter->dev,
235	"MAX1619 detection failed at 0x%02x.\n",
236	address);
237	goto exit_free;
238	}
239	}
240
241	if (kind <= 0) { /* identification */
242
243	man_id = i2c_smbus_read_byte_data(new_client,
244	MAX1619_REG_R_MAN_ID);
245	chip_id = i2c_smbus_read_byte_data(new_client,
246	MAX1619_REG_R_CHIP_ID);
247
248	if ((man_id == 0x4D) && (chip_id == 0x04)){
249	kind = max1619;
250	}
251	}
252
253	if (kind <= 0) { /* identification failed */
254	dev_info(&adapter->dev,
255	"Unsupported chip (man_id=0x%02X, "
256	"chip_id=0x%02X).\n", man_id, chip_id);
257	goto exit_free;
258	}
259
260
261	if (kind == max1619){
262	name = "max1619";
263	}
264
265	/* We can fill in the remaining client fields */
266	strlcpy(new_client->name, name, I2C_NAME_SIZE);
267	data->valid = 0;
268	init_MUTEX(&data->update_lock);
269
270	/* Tell the I2C layer a new client has arrived */
271	if ((err = i2c_attach_client(new_client)))
272	goto exit_free;
273
274	/* Initialize the MAX1619 chip */
275	max1619_init_client(new_client);
276
277	/* Register sysfs hooks */
278	device_create_file(&new_client->dev, &dev_attr_temp1_input);
279	device_create_file(&new_client->dev, &dev_attr_temp2_input);
280	device_create_file(&new_client->dev, &dev_attr_temp2_min);
281	device_create_file(&new_client->dev, &dev_attr_temp2_max);
282	device_create_file(&new_client->dev, &dev_attr_temp2_crit);
283	device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
284	device_create_file(&new_client->dev, &dev_attr_alarms);
285
286	return 0;
287
288	exit_free:
289	kfree(data);
290	exit:
291	return err;
292	}
293
294	static void max1619_init_client(struct i2c_client *client)
295	{
296	u8 config;
297
298	/*
299	* Start the conversions.
300	*/
301	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
302	5); /* 2 Hz */
303	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
304	if (config & 0x40)
305	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
306	config & 0xBF); /* run */
307	}
308
309	static int max1619_detach_client(struct i2c_client *client)
310	{
311	int err;
312
313	if ((err = i2c_detach_client(client))) {
314	dev_err(&client->dev, "Client deregistration failed, "
315	"client not detached.\n");
316	return err;
317	}
318
319	kfree(i2c_get_clientdata(client));
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
328	down(&data->update_lock);
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
351	up(&data->update_lock);
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
366	MODULE_AUTHOR("Alexey Fisher <[email protected]> and"
367	"Jean Delvare <[email protected]>");
368	MODULE_DESCRIPTION("MAX1619 sensor driver");
369	MODULE_LICENSE("GPL");
370
371	module_init(sensors_max1619_init);
372	module_exit(sensors_max1619_exit);