[linux-2.6-block.git] / drivers / hwmon / adm1029.c

/*
 * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
 *
 * Copyright (C) 2006 Corentin LABBE <corentin.labbe@geomatys.fr>
 *
 * Based on LM83 Driver by Jean Delvare <khali@linux-fr.org>
 *
 * Give only processor, motherboard temperatures and fan tachs
 * Very rare chip please let me know if you use it
 *
 * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.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 version 2 of the License
 *
 * 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-sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>

/*
 * Addresses to scan
 */

static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
						0x2e, 0x2f, I2C_CLIENT_END
};

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_1(adm1029);

/*
 * The ADM1029 registers
 * Manufacturer ID is 0x41 for Analog Devices
 */

#define ADM1029_REG_MAN_ID			0x0D
#define ADM1029_REG_CHIP_ID			0x0E
#define ADM1029_REG_CONFIG			0x01
#define ADM1029_REG_NB_FAN_SUPPORT		0x02

#define ADM1029_REG_TEMP_DEVICES_INSTALLED	0x06

#define ADM1029_REG_LOCAL_TEMP			0xA0
#define ADM1029_REG_REMOTE1_TEMP		0xA1
#define ADM1029_REG_REMOTE2_TEMP		0xA2

#define ADM1029_REG_LOCAL_TEMP_HIGH		0x90
#define ADM1029_REG_REMOTE1_TEMP_HIGH		0x91
#define ADM1029_REG_REMOTE2_TEMP_HIGH		0x92

#define ADM1029_REG_LOCAL_TEMP_LOW		0x98
#define ADM1029_REG_REMOTE1_TEMP_LOW		0x99
#define ADM1029_REG_REMOTE2_TEMP_LOW		0x9A

#define ADM1029_REG_FAN1			0x70
#define ADM1029_REG_FAN2			0x71

#define ADM1029_REG_FAN1_MIN			0x78
#define ADM1029_REG_FAN2_MIN			0x79

#define ADM1029_REG_FAN1_CONFIG			0x68
#define ADM1029_REG_FAN2_CONFIG			0x69

#define TEMP_FROM_REG(val)	((val) * 1000)

#define DIV_FROM_REG(val)	( 1 << (((val) >> 6) - 1))

/* Registers to be checked by adm1029_update_device() */
static const u8 ADM1029_REG_TEMP[] = {
	ADM1029_REG_LOCAL_TEMP,
	ADM1029_REG_REMOTE1_TEMP,
	ADM1029_REG_REMOTE2_TEMP,
	ADM1029_REG_LOCAL_TEMP_HIGH,
	ADM1029_REG_REMOTE1_TEMP_HIGH,
	ADM1029_REG_REMOTE2_TEMP_HIGH,
	ADM1029_REG_LOCAL_TEMP_LOW,
	ADM1029_REG_REMOTE1_TEMP_LOW,
	ADM1029_REG_REMOTE2_TEMP_LOW,
};

static const u8 ADM1029_REG_FAN[] = {
	ADM1029_REG_FAN1,
	ADM1029_REG_FAN2,
	ADM1029_REG_FAN1_MIN,
	ADM1029_REG_FAN2_MIN,
};

static const u8 ADM1029_REG_FAN_DIV[] = {
	ADM1029_REG_FAN1_CONFIG,
	ADM1029_REG_FAN2_CONFIG,
};

/*
 * Functions declaration
 */

static int adm1029_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int adm1029_detect(struct i2c_client *client, int kind,
			  struct i2c_board_info *info);
static int adm1029_remove(struct i2c_client *client);
static struct adm1029_data *adm1029_update_device(struct device *dev);
static int adm1029_init_client(struct i2c_client *client);

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

static const struct i2c_device_id adm1029_id[] = {
	{ "adm1029", adm1029 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adm1029_id);

static struct i2c_driver adm1029_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name = "adm1029",
	},
	.probe		= adm1029_probe,
	.remove		= adm1029_remove,
	.id_table	= adm1029_id,
	.detect		= adm1029_detect,
	.address_data	= &addr_data,
};

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

struct adm1029_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, signed for temperature, unsigned for other stuff */
	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
};

/*
 * Sysfs stuff
 */

static ssize_t
show_temp(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adm1029_data *data = adm1029_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t
show_fan(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adm1029_data *data = adm1029_update_device(dev);
	u16 val;
	if (data->fan[attr->index] == 0
	    || (data->fan_div[attr->index] & 0xC0) == 0
	    || data->fan[attr->index] == 255) {
		return sprintf(buf, "0\n");
	}

	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
	    / data->fan[attr->index];
	return sprintf(buf, "%d\n", val);
}

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adm1029_data *data = adm1029_update_device(dev);
	if ((data->fan_div[attr->index] & 0xC0) == 0)
		return sprintf(buf, "0\n");
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
}

static ssize_t set_fan_div(struct device *dev,
	    struct device_attribute *devattr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1029_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	long val = simple_strtol(buf, NULL, 10);
	u8 reg;

	mutex_lock(&data->update_lock);

	/*Read actual config */
	reg = i2c_smbus_read_byte_data(client,
				       ADM1029_REG_FAN_DIV[attr->index]);

	switch (val) {
	case 1:
		val = 1;
		break;
	case 2:
		val = 2;
		break;
	case 4:
		val = 3;
		break;
	default:
		mutex_unlock(&data->update_lock);
		dev_err(&client->dev, "fan_div value %ld not "
			"supported. Choose one of 1, 2 or 4!\n", val);
		return -EINVAL;
	}
	/* Update the value */
	reg = (reg & 0x3F) | (val << 6);

	/* Write value */
	i2c_smbus_write_byte_data(client,
				  ADM1029_REG_FAN_DIV[attr->index], reg);
	mutex_unlock(&data->update_lock);

	return count;
}

/*
Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others
			S_IWUSR stand for Is Writable by User
*/
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);

static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);

static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);

static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
			  show_fan_div, set_fan_div, 0);
static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
			  show_fan_div, set_fan_div, 1);

static struct attribute *adm1029_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan1_div.dev_attr.attr,
	&sensor_dev_attr_fan2_div.dev_attr.attr,
	NULL
};

static const struct attribute_group adm1029_group = {
	.attrs = adm1029_attributes,
};

/*
 * Real code
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int adm1029_detect(struct i2c_client *client, int kind,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;

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

	/* ADM1029 doesn't have CHIP ID, check just MAN ID
	 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
	 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
	 * documented
	 */

	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
	temp_devices_installed = i2c_smbus_read_byte_data(client,
					ADM1029_REG_TEMP_DEVICES_INSTALLED);
	nb_fan_support = i2c_smbus_read_byte_data(client,
						ADM1029_REG_NB_FAN_SUPPORT);
	/* 0x41 is Analog Devices */
	if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01
	    || nb_fan_support != 0x03)
		return -ENODEV;

	if ((chip_id & 0xF0) != 0x00) {
		/* There are no "official" CHIP ID, so actually
		 * we use Major/Minor revision for that */
		pr_info("adm1029: Unknown major revision %x, "
			"please let us know\n", chip_id);
		return -ENODEV;
	}

	strlcpy(info->type, "adm1029", I2C_NAME_SIZE);

	return 0;
}

static int adm1029_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct adm1029_data *data;
	int err;

	data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/*
	 * Initialize the ADM1029 chip
	 * Check config register
	 */
	if (adm1029_init_client(client) == 0) {
		err = -ENODEV;
		goto exit_free;
	}

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
		goto exit_free;

	data->hwmon_dev = hwmon_device_register(&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(&client->dev.kobj, &adm1029_group);
 exit_free:
	kfree(data);
 exit:
	return err;
}

static int adm1029_init_client(struct i2c_client *client)
{
	u8 config;
	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	if ((config & 0x10) == 0) {
		i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
					  config | 0x10);
	}
	/* recheck config */
	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	if ((config & 0x10) == 0) {
		dev_err(&client->dev, "Initialization failed!\n");
		return 0;
	}
	return 1;
}

static int adm1029_remove(struct i2c_client *client)
{
	struct adm1029_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &adm1029_group);

	kfree(data);
	return 0;
}

/*
function that update the status of the chips (temperature for example)
*/
static struct adm1029_data *adm1029_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1029_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);
	/*
	 * Use the "cache" Luke, don't recheck values
	 * if there are already checked not a long time later
	 */
	if (time_after(jiffies, data->last_updated + HZ * 2)
	 || !data->valid) {
		int nr;

		dev_dbg(&client->dev, "Updating adm1029 data\n");

		for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
			data->temp[nr] =
			    i2c_smbus_read_byte_data(client,
						     ADM1029_REG_TEMP[nr]);
		}
		for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
			data->fan[nr] =
			    i2c_smbus_read_byte_data(client,
						     ADM1029_REG_FAN[nr]);
		}
		for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
			data->fan_div[nr] =
			    i2c_smbus_read_byte_data(client,
						     ADM1029_REG_FAN_DIV[nr]);
		}

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

	mutex_unlock(&data->update_lock);

	return data;
}

/*
	Common module stuff
*/
static int __init sensors_adm1029_init(void)
{

	return i2c_add_driver(&adm1029_driver);
}

static void __exit sensors_adm1029_exit(void)
{

	i2c_del_driver(&adm1029_driver);
}

MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
MODULE_DESCRIPTION("adm1029 driver");
MODULE_LICENSE("GPL v2");

module_init(sensors_adm1029_init);
module_exit(sensors_adm1029_exit);
Commit	Line	Data
cae2caae CL	1	/*
	2	* adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
	3	*
	4	* Copyright (C) 2006 Corentin LABBE <corentin.labbe@geomatys.fr>
	5	*
	6	* Based on LM83 Driver by Jean Delvare <khali@linux-fr.org>
	7	*
	8	* Give only processor, motherboard temperatures and fan tachs
	9	* Very rare chip please let me know if you use it
	10	*
	11	* http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
	12	*
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation version 2 of the License
	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	#include <linux/module.h>
	29	#include <linux/init.h>
	30	#include <linux/slab.h>
	31	#include <linux/jiffies.h>
	32	#include <linux/i2c.h>
	33	#include <linux/hwmon-sysfs.h>
	34	#include <linux/hwmon.h>
	35	#include <linux/err.h>
	36	#include <linux/mutex.h>
	37
	38	/*
	39	* Addresses to scan
	40	*/
	41
25e9c86d MH	42	static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
25e9c86d MH	43	0x2e, 0x2f, I2C_CLIENT_END
cae2caae CL	44	};
	45
	46	/*
	47	* Insmod parameters
	48	*/
	49
	50	I2C_CLIENT_INSMOD_1(adm1029);
	51
	52	/*
	53	* The ADM1029 registers
	54	* Manufacturer ID is 0x41 for Analog Devices
	55	*/
	56
	57	#define ADM1029_REG_MAN_ID 0x0D
	58	#define ADM1029_REG_CHIP_ID 0x0E
	59	#define ADM1029_REG_CONFIG 0x01
	60	#define ADM1029_REG_NB_FAN_SUPPORT 0x02
	61
	62	#define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06
	63
	64	#define ADM1029_REG_LOCAL_TEMP 0xA0
	65	#define ADM1029_REG_REMOTE1_TEMP 0xA1
	66	#define ADM1029_REG_REMOTE2_TEMP 0xA2
	67
	68	#define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
	69	#define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
	70	#define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92
	71
	72	#define ADM1029_REG_LOCAL_TEMP_LOW 0x98
	73	#define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
	74	#define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A
	75
	76	#define ADM1029_REG_FAN1 0x70
	77	#define ADM1029_REG_FAN2 0x71
	78
	79	#define ADM1029_REG_FAN1_MIN 0x78
	80	#define ADM1029_REG_FAN2_MIN 0x79
	81
	82	#define ADM1029_REG_FAN1_CONFIG 0x68
	83	#define ADM1029_REG_FAN2_CONFIG 0x69
	84
	85	#define TEMP_FROM_REG(val) ((val) * 1000)
	86
	87	#define DIV_FROM_REG(val) ( 1 << (((val) >> 6) - 1))
	88
	89	/* Registers to be checked by adm1029_update_device() */
	90	static const u8 ADM1029_REG_TEMP[] = {
	91	ADM1029_REG_LOCAL_TEMP,
	92	ADM1029_REG_REMOTE1_TEMP,
	93	ADM1029_REG_REMOTE2_TEMP,
	94	ADM1029_REG_LOCAL_TEMP_HIGH,
	95	ADM1029_REG_REMOTE1_TEMP_HIGH,
	96	ADM1029_REG_REMOTE2_TEMP_HIGH,
	97	ADM1029_REG_LOCAL_TEMP_LOW,
	98	ADM1029_REG_REMOTE1_TEMP_LOW,
	99	ADM1029_REG_REMOTE2_TEMP_LOW,
	100	};
	101
	102	static const u8 ADM1029_REG_FAN[] = {
	103	ADM1029_REG_FAN1,
	104	ADM1029_REG_FAN2,
	105	ADM1029_REG_FAN1_MIN,
	106	ADM1029_REG_FAN2_MIN,
	107	};
108
109	static const u8 ADM1029_REG_FAN_DIV[] = {
110	ADM1029_REG_FAN1_CONFIG,
111	ADM1029_REG_FAN2_CONFIG,
112	};
113
114	/*
115	* Functions declaration
116	*/
117
9c97fb4d JD	118	static int adm1029_probe(struct i2c_client *client,
	119	const struct i2c_device_id *id);
	120	static int adm1029_detect(struct i2c_client *client, int kind,
	121	struct i2c_board_info *info);
	122	static int adm1029_remove(struct i2c_client *client);
cae2caae CL	123	static struct adm1029_data adm1029_update_device(struct device dev);
	124	static int adm1029_init_client(struct i2c_client *client);
	125
	126	/*
	127	* Driver data (common to all clients)
	128	*/
	129
9c97fb4d JD	130	static const struct i2c_device_id adm1029_id[] = {
	131	{ "adm1029", adm1029 },
	132	{ }
	133	};
	134	MODULE_DEVICE_TABLE(i2c, adm1029_id);
	135
cae2caae	136	static struct i2c_driver adm1029_driver = {
9c97fb4d	137	.class = I2C_CLASS_HWMON,
cae2caae CL	138	.driver = {
	139	.name = "adm1029",
	140	},
9c97fb4d JD	141	.probe = adm1029_probe,
	142	.remove = adm1029_remove,
	143	.id_table = adm1029_id,
	144	.detect = adm1029_detect,
	145	.address_data = &addr_data,
cae2caae CL	146	};
	147
	148	/*
	149	* Client data (each client gets its own)
	150	*/
	151
	152	struct adm1029_data {
1beeffe4	153	struct device *hwmon_dev;
cae2caae CL	154	struct mutex update_lock;
	155	char valid; /* zero until following fields are valid */
	156	unsigned long last_updated; /* in jiffies */
	157
	158	/* registers values, signed for temperature, unsigned for other stuff */
	159	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
	160	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
	161	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
	162	};
	163
	164	/*
	165	* Sysfs stuff
	166	*/
	167
	168	static ssize_t
	169	show_temp(struct device dev, struct device_attribute devattr, char *buf)
	170	{
	171	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	172	struct adm1029_data *data = adm1029_update_device(dev);
	173	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
	174	}
	175
	176	static ssize_t
	177	show_fan(struct device dev, struct device_attribute devattr, char *buf)
	178	{
	179	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	180	struct adm1029_data *data = adm1029_update_device(dev);
	181	u16 val;
366716e6 CL	182	if (data->fan[attr->index] == 0
366716e6 CL	183	\|\| (data->fan_div[attr->index] & 0xC0) == 0
cae2caae CL	184	\|\| data->fan[attr->index] == 255) {
	185	return sprintf(buf, "0\n");
	186	}
	187
	188	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
	189	/ data->fan[attr->index];
	190	return sprintf(buf, "%d\n", val);
	191	}
	192
	193	static ssize_t
	194	show_fan_div(struct device dev, struct device_attribute devattr, char *buf)
	195	{
	196	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	197	struct adm1029_data *data = adm1029_update_device(dev);
366716e6	198	if ((data->fan_div[attr->index] & 0xC0) == 0)
cae2caae CL	199	return sprintf(buf, "0\n");
	200	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
	201	}
	202
	203	static ssize_t set_fan_div(struct device *dev,
	204	struct device_attribute devattr, const char buf, size_t count)
	205	{
	206	struct i2c_client *client = to_i2c_client(dev);
	207	struct adm1029_data *data = i2c_get_clientdata(client);
	208	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	209	long val = simple_strtol(buf, NULL, 10);
	210	u8 reg;
	211
	212	mutex_lock(&data->update_lock);
	213
	214	/Read actual config /
	215	reg = i2c_smbus_read_byte_data(client,
	216	ADM1029_REG_FAN_DIV[attr->index]);
	217
	218	switch (val) {
	219	case 1:
	220	val = 1;
	221	break;
	222	case 2:
	223	val = 2;
	224	break;
	225	case 4:
	226	val = 3;
	227	break;
	228	default:
	229	mutex_unlock(&data->update_lock);
	230	dev_err(&client->dev, "fan_div value %ld not "
	231	"supported. Choose one of 1, 2 or 4!\n", val);
	232	return -EINVAL;
	233	}
	234	/* Update the value */
	235	reg = (reg & 0x3F) \| (val << 6);
	236
	237	/* Write value */
	238	i2c_smbus_write_byte_data(client,
	239	ADM1029_REG_FAN_DIV[attr->index], reg);
	240	mutex_unlock(&data->update_lock);
	241
	242	return count;
	243	}
	244
	245	/*
	246	Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others
	247	S_IWUSR stand for Is Writable by User
	248	*/
	249	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	250	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	251	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	252
	253	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
	254	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
	255	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
	256
	257	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
	258	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
	259	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
	260
	261	static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
	262	static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
263
264	static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
265	static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
266
267	static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO \| S_IWUSR,
268	show_fan_div, set_fan_div, 0);
269	static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO \| S_IWUSR,
270	show_fan_div, set_fan_div, 1);
271
272	static struct attribute *adm1029_attributes[] = {
273	&sensor_dev_attr_temp1_input.dev_attr.attr,
274	&sensor_dev_attr_temp1_min.dev_attr.attr,
275	&sensor_dev_attr_temp1_max.dev_attr.attr,
276	&sensor_dev_attr_temp2_input.dev_attr.attr,
277	&sensor_dev_attr_temp2_min.dev_attr.attr,
278	&sensor_dev_attr_temp2_max.dev_attr.attr,
279	&sensor_dev_attr_temp3_input.dev_attr.attr,
280	&sensor_dev_attr_temp3_min.dev_attr.attr,
281	&sensor_dev_attr_temp3_max.dev_attr.attr,
282	&sensor_dev_attr_fan1_input.dev_attr.attr,
283	&sensor_dev_attr_fan2_input.dev_attr.attr,
284	&sensor_dev_attr_fan1_min.dev_attr.attr,
285	&sensor_dev_attr_fan2_min.dev_attr.attr,
286	&sensor_dev_attr_fan1_div.dev_attr.attr,
287	&sensor_dev_attr_fan2_div.dev_attr.attr,
288	NULL
289	};
290
291	static const struct attribute_group adm1029_group = {
292	.attrs = adm1029_attributes,
293	};
294
295	/*
296	* Real code
297	*/
298
9c97fb4d JD	299	/* Return 0 if detection is successful, -ENODEV otherwise */
	300	static int adm1029_detect(struct i2c_client *client, int kind,
	301	struct i2c_board_info *info)
cae2caae	302	{
9c97fb4d	303	struct i2c_adapter *adapter = client->adapter;
52df6440	304	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
cae2caae	305
cae2caae	306	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
9c97fb4d	307	return -ENODEV;
cae2caae	308
cae2caae CL	309	/* ADM1029 doesn't have CHIP ID, check just MAN ID
	310	* For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
	311	* ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
	312	* documented
	313	*/
	314
52df6440 JD	315	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
	316	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
	317	temp_devices_installed = i2c_smbus_read_byte_data(client,
cae2caae	318	ADM1029_REG_TEMP_DEVICES_INSTALLED);
52df6440	319	nb_fan_support = i2c_smbus_read_byte_data(client,
cae2caae	320	ADM1029_REG_NB_FAN_SUPPORT);
52df6440 JD	321	/* 0x41 is Analog Devices */
	322	if (man_id != 0x41 \|\| (temp_devices_installed & 0xf9) != 0x01
	323	\|\| nb_fan_support != 0x03)
	324	return -ENODEV;
	325
	326	if ((chip_id & 0xF0) != 0x00) {
	327	/* There are no "official" CHIP ID, so actually
	328	* we use Major/Minor revision for that */
	329	pr_info("adm1029: Unknown major revision %x, "
	330	"please let us know\n", chip_id);
	331	return -ENODEV;
cae2caae	332	}
52df6440	333
9c97fb4d	334	strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
cae2caae	335
9c97fb4d JD	336	return 0;
	337	}
	338
	339	static int adm1029_probe(struct i2c_client *client,
	340	const struct i2c_device_id *id)
	341	{
	342	struct adm1029_data *data;
	343	int err;
	344
	345	data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL);
	346	if (!data) {
	347	err = -ENOMEM;
	348	goto exit;
cae2caae CL	349	}
cae2caae CL	350
9c97fb4d	351	i2c_set_clientdata(client, data);
cae2caae CL	352	mutex_init(&data->update_lock);
cae2caae CL	353
cae2caae CL	354	/*
	355	* Initialize the ADM1029 chip
	356	* Check config register
	357	*/
9c97fb4d JD	358	if (adm1029_init_client(client) == 0) {
	359	err = -ENODEV;
	360	goto exit_free;
	361	}
cae2caae CL	362
	363	/* Register sysfs hooks */
	364	if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
9c97fb4d	365	goto exit_free;
cae2caae	366
1beeffe4 TJ	367	data->hwmon_dev = hwmon_device_register(&client->dev);
	368	if (IS_ERR(data->hwmon_dev)) {
	369	err = PTR_ERR(data->hwmon_dev);
cae2caae CL	370	goto exit_remove_files;
	371	}
	372
	373	return 0;
	374
	375	exit_remove_files:
	376	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
cae2caae CL	377	exit_free:
	378	kfree(data);
	379	exit:
	380	return err;
	381	}
	382
	383	static int adm1029_init_client(struct i2c_client *client)
	384	{
	385	u8 config;
	386	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	387	if ((config & 0x10) == 0) {
	388	i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
	389	config \| 0x10);
	390	}
	391	/* recheck config */
	392	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	393	if ((config & 0x10) == 0) {
	394	dev_err(&client->dev, "Initialization failed!\n");
	395	return 0;
	396	}
	397	return 1;
	398	}
	399
9c97fb4d	400	static int adm1029_remove(struct i2c_client *client)
cae2caae CL	401	{
cae2caae CL	402	struct adm1029_data *data = i2c_get_clientdata(client);
cae2caae	403
1beeffe4	404	hwmon_device_unregister(data->hwmon_dev);
cae2caae CL	405	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
cae2caae CL	406
cae2caae CL	407	kfree(data);
	408	return 0;
	409	}
	410
	411	/*
af901ca1	412	function that update the status of the chips (temperature for example)
cae2caae CL	413	*/
	414	static struct adm1029_data adm1029_update_device(struct device dev)
	415	{
	416	struct i2c_client *client = to_i2c_client(dev);
	417	struct adm1029_data *data = i2c_get_clientdata(client);
	418
	419	mutex_lock(&data->update_lock);
	420	/*
	421	* Use the "cache" Luke, don't recheck values
	422	* if there are already checked not a long time later
	423	*/
	424	if (time_after(jiffies, data->last_updated + HZ * 2)
	425	\|\| !data->valid) {
	426	int nr;
	427
	428	dev_dbg(&client->dev, "Updating adm1029 data\n");
	429
	430	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
	431	data->temp[nr] =
	432	i2c_smbus_read_byte_data(client,
	433	ADM1029_REG_TEMP[nr]);
	434	}
	435	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
	436	data->fan[nr] =
	437	i2c_smbus_read_byte_data(client,
	438	ADM1029_REG_FAN[nr]);
	439	}
	440	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
	441	data->fan_div[nr] =
	442	i2c_smbus_read_byte_data(client,
	443	ADM1029_REG_FAN_DIV[nr]);
	444	}
	445
	446	data->last_updated = jiffies;
	447	data->valid = 1;
	448	}
	449
	450	mutex_unlock(&data->update_lock);
	451
	452	return data;
	453	}
	454
	455	/*
	456	Common module stuff
	457	*/
	458	static int __init sensors_adm1029_init(void)
	459	{
	460
	461	return i2c_add_driver(&adm1029_driver);
	462	}
	463
	464	static void __exit sensors_adm1029_exit(void)
	465	{
	466
	467	i2c_del_driver(&adm1029_driver);
	468	}
	469
	470	MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
	471	MODULE_DESCRIPTION("adm1029 driver");
	472	MODULE_LICENSE("GPL v2");
	473
	474	module_init(sensors_adm1029_init);
	475	module_exit(sensors_adm1029_exit);