[mirror_ubuntu-kernels.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_attach_adapter(struct i2c_adapter *adapter);
static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind);
static int adm1029_detach_client(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 struct i2c_driver adm1029_driver = {
	.driver = {
		.name = "adm1029",
	},
	.attach_adapter = adm1029_attach_adapter,
	.detach_client = adm1029_detach_client,
};

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

struct adm1029_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, 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] == 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] == 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
 */

static int adm1029_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, adm1029_detect);
}

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */

static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client;
	struct adm1029_data *data;
	int err = 0;
	const char *name = "";
	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

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

	client = &data->client;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &adm1029_driver;

	/* Now we do the detection and identification. A negative kind
	 * means that the driver was loaded with no force parameter
	 * (default), so we must both detect and identify the chip
	 * (actually there is only one possible kind of chip for now, adm1029).
	 * 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. */

	/* Default to an adm1029 if forced */
	if (kind == 0)
		kind = adm1029;

	/* 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
	 */

	if (kind <= 0) {	/* identification */
		u8 man_id, chip_id, temp_devices_installed, nb_fan_support;

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

		if (kind <= 0) {	/* identification failed */
			pr_debug("adm1029: Unsupported chip (man_id=0x%02X, "
				 "chip_id=0x%02X)\n", man_id, chip_id);
			goto exit_free;
		}
	}

	if (kind == adm1029) {
		name = "adm1029";
	}

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

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

	/*
	 * Initialize the ADM1029 chip
	 * Check config register
	 */
	if (adm1029_init_client(client) == 0)
		goto exit_detach;

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

	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_detach:
	i2c_detach_client(client);
 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_detach_client(struct i2c_client *client)
{
	struct adm1029_data *data = i2c_get_clientdata(client);
	int err;

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

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

	kfree(data);
	return 0;
}

/*
function that update the status of the chips (temperature for exemple)
*/
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
118	static int adm1029_attach_adapter(struct i2c_adapter *adapter);
119	static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind);
120	static int adm1029_detach_client(struct i2c_client *client);
121	static struct adm1029_data adm1029_update_device(struct device dev);
122	static int adm1029_init_client(struct i2c_client *client);
123
124	/*
125	* Driver data (common to all clients)
126	*/
127
128	static struct i2c_driver adm1029_driver = {
129	.driver = {
130	.name = "adm1029",
131	},
132	.attach_adapter = adm1029_attach_adapter,
133	.detach_client = adm1029_detach_client,
134	};
135
136	/*
137	* Client data (each client gets its own)
138	*/
139
140	struct adm1029_data {
141	struct i2c_client client;
1beeffe4	142	struct device *hwmon_dev;
cae2caae CL	143	struct mutex update_lock;
	144	char valid; /* zero until following fields are valid */
	145	unsigned long last_updated; /* in jiffies */
	146
	147	/* registers values, signed for temperature, unsigned for other stuff */
	148	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
	149	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
	150	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
	151	};
	152
	153	/*
	154	* Sysfs stuff
	155	*/
	156
	157	static ssize_t
	158	show_temp(struct device dev, struct device_attribute devattr, char *buf)
	159	{
	160	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	161	struct adm1029_data *data = adm1029_update_device(dev);
	162	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
	163	}
	164
	165	static ssize_t
	166	show_fan(struct device dev, struct device_attribute devattr, char *buf)
	167	{
	168	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	169	struct adm1029_data *data = adm1029_update_device(dev);
	170	u16 val;
	171	if (data->fan[attr->index] == 0 \|\| data->fan_div[attr->index] == 0
	172	\|\| data->fan[attr->index] == 255) {
	173	return sprintf(buf, "0\n");
	174	}
	175
	176	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
	177	/ data->fan[attr->index];
	178	return sprintf(buf, "%d\n", val);
	179	}
	180
	181	static ssize_t
	182	show_fan_div(struct device dev, struct device_attribute devattr, char *buf)
	183	{
	184	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	185	struct adm1029_data *data = adm1029_update_device(dev);
	186	if (data->fan_div[attr->index] == 0)
	187	return sprintf(buf, "0\n");
	188	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
	189	}
	190
	191	static ssize_t set_fan_div(struct device *dev,
	192	struct device_attribute devattr, const char buf, size_t count)
	193	{
	194	struct i2c_client *client = to_i2c_client(dev);
	195	struct adm1029_data *data = i2c_get_clientdata(client);
	196	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	197	long val = simple_strtol(buf, NULL, 10);
	198	u8 reg;
	199
	200	mutex_lock(&data->update_lock);
	201
	202	/Read actual config /
	203	reg = i2c_smbus_read_byte_data(client,
	204	ADM1029_REG_FAN_DIV[attr->index]);
	205
	206	switch (val) {
207	case 1:
208	val = 1;
209	break;
210	case 2:
211	val = 2;
212	break;
213	case 4:
214	val = 3;
215	break;
216	default:
217	mutex_unlock(&data->update_lock);
218	dev_err(&client->dev, "fan_div value %ld not "
219	"supported. Choose one of 1, 2 or 4!\n", val);
220	return -EINVAL;
221	}
222	/* Update the value */
223	reg = (reg & 0x3F) \| (val << 6);
224
225	/* Write value */
226	i2c_smbus_write_byte_data(client,
227	ADM1029_REG_FAN_DIV[attr->index], reg);
228	mutex_unlock(&data->update_lock);
229
230	return count;
231	}
232
233	/*
234	Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others
235	S_IWUSR stand for Is Writable by User
236	*/
237	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
238	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
239	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
240
241	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
242	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
243	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
244
245	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
246	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
247	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
248
249	static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
250	static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
251
252	static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
253	static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
254
255	static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO \| S_IWUSR,
256	show_fan_div, set_fan_div, 0);
257	static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO \| S_IWUSR,
258	show_fan_div, set_fan_div, 1);
259
260	static struct attribute *adm1029_attributes[] = {
261	&sensor_dev_attr_temp1_input.dev_attr.attr,
262	&sensor_dev_attr_temp1_min.dev_attr.attr,
263	&sensor_dev_attr_temp1_max.dev_attr.attr,
264	&sensor_dev_attr_temp2_input.dev_attr.attr,
265	&sensor_dev_attr_temp2_min.dev_attr.attr,
266	&sensor_dev_attr_temp2_max.dev_attr.attr,
267	&sensor_dev_attr_temp3_input.dev_attr.attr,
268	&sensor_dev_attr_temp3_min.dev_attr.attr,
269	&sensor_dev_attr_temp3_max.dev_attr.attr,
270	&sensor_dev_attr_fan1_input.dev_attr.attr,
271	&sensor_dev_attr_fan2_input.dev_attr.attr,
272	&sensor_dev_attr_fan1_min.dev_attr.attr,
273	&sensor_dev_attr_fan2_min.dev_attr.attr,
274	&sensor_dev_attr_fan1_div.dev_attr.attr,
275	&sensor_dev_attr_fan2_div.dev_attr.attr,
276	NULL
277	};
278
279	static const struct attribute_group adm1029_group = {
280	.attrs = adm1029_attributes,
281	};
282
283	/*
284	* Real code
285	*/
286
287	static int adm1029_attach_adapter(struct i2c_adapter *adapter)
288	{
289	if (!(adapter->class & I2C_CLASS_HWMON))
290	return 0;
291	return i2c_probe(adapter, &addr_data, adm1029_detect);
292	}
293
294	/*
295	* The following function does more than just detection. If detection
296	* succeeds, it also registers the new chip.
297	*/
298
299	static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)
300	{
301	struct i2c_client *client;
302	struct adm1029_data *data;
303	int err = 0;
304	const char *name = "";
305	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
306	goto exit;
307
308	if (!(data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL))) {
309	err = -ENOMEM;
310	goto exit;
311	}
312
313	client = &data->client;
314	i2c_set_clientdata(client, data);
315	client->addr = address;
316	client->adapter = adapter;
317	client->driver = &adm1029_driver;
318
319	/* Now we do the detection and identification. A negative kind
320	* means that the driver was loaded with no force parameter
321	* (default), so we must both detect and identify the chip
322	* (actually there is only one possible kind of chip for now, adm1029).
323	* A zero kind means that the driver was loaded with the force
324	* parameter, the detection step shall be skipped. A positive kind
325	* means that the driver was loaded with the force parameter and a
326	* given kind of chip is requested, so both the detection and the
327	* identification steps are skipped. */
328
329	/* Default to an adm1029 if forced */
330	if (kind == 0)
331	kind = adm1029;
332
333	/* ADM1029 doesn't have CHIP ID, check just MAN ID
334	* For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
335	* ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
336	* documented
337	*/
338
339	if (kind <= 0) { /* identification */
340	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
341
342	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
343	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
344	temp_devices_installed = i2c_smbus_read_byte_data(client,
345	ADM1029_REG_TEMP_DEVICES_INSTALLED);
346	nb_fan_support = i2c_smbus_read_byte_data(client,
347	ADM1029_REG_NB_FAN_SUPPORT);
348	/* 0x41 is Analog Devices */
349	if (man_id == 0x41 && (temp_devices_installed & 0xf9) == 0x01
350	&& nb_fan_support == 0x03) {
351	if ((chip_id & 0xF0) == 0x00) {
352	kind = adm1029;
353	} else {
354	/* There are no "official" CHIP ID, so actually
355	* we use Major/Minor revision for that */
356	printk(KERN_INFO
357	"adm1029: Unknown major revision %x, "
358	"please let us know\n", chip_id);
359	}
360	}
361
362	if (kind <= 0) { /* identification failed */
363	pr_debug("adm1029: Unsupported chip (man_id=0x%02X, "
364	"chip_id=0x%02X)\n", man_id, chip_id);
365	goto exit_free;
366	}
367	}
368
369	if (kind == adm1029) {
370	name = "adm1029";
371	}
372
373	/* We can fill in the remaining client fields */
374	strlcpy(client->name, name, I2C_NAME_SIZE);
375	mutex_init(&data->update_lock);
376
377	/* Tell the I2C layer a new client has arrived */
378	if ((err = i2c_attach_client(client)))
379	goto exit_free;
380
381	/*
382	* Initialize the ADM1029 chip
383	* Check config register
384	*/
385	if (adm1029_init_client(client) == 0)
386	goto exit_detach;
387
388	/* Register sysfs hooks */
389	if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
390	goto exit_detach;
391
1beeffe4 TJ	392	data->hwmon_dev = hwmon_device_register(&client->dev);
	393	if (IS_ERR(data->hwmon_dev)) {
	394	err = PTR_ERR(data->hwmon_dev);
cae2caae CL	395	goto exit_remove_files;
	396	}
	397
	398	return 0;
	399
	400	exit_remove_files:
	401	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
	402	exit_detach:
	403	i2c_detach_client(client);
	404	exit_free:
	405	kfree(data);
	406	exit:
	407	return err;
	408	}
	409
	410	static int adm1029_init_client(struct i2c_client *client)
	411	{
	412	u8 config;
	413	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	414	if ((config & 0x10) == 0) {
	415	i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
	416	config \| 0x10);
	417	}
	418	/* recheck config */
	419	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	420	if ((config & 0x10) == 0) {
	421	dev_err(&client->dev, "Initialization failed!\n");
	422	return 0;
	423	}
	424	return 1;
	425	}
	426
	427	static int adm1029_detach_client(struct i2c_client *client)
	428	{
	429	struct adm1029_data *data = i2c_get_clientdata(client);
	430	int err;
	431
1beeffe4	432	hwmon_device_unregister(data->hwmon_dev);
cae2caae CL	433	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
	434
	435	if ((err = i2c_detach_client(client)))
	436	return err;
	437
	438	kfree(data);
	439	return 0;
	440	}
	441
	442	/*
	443	function that update the status of the chips (temperature for exemple)
	444	*/
	445	static struct adm1029_data adm1029_update_device(struct device dev)
	446	{
	447	struct i2c_client *client = to_i2c_client(dev);
	448	struct adm1029_data *data = i2c_get_clientdata(client);
	449
	450	mutex_lock(&data->update_lock);
	451	/*
	452	* Use the "cache" Luke, don't recheck values
	453	* if there are already checked not a long time later
	454	*/
	455	if (time_after(jiffies, data->last_updated + HZ * 2)
	456	\|\| !data->valid) {
	457	int nr;
	458
	459	dev_dbg(&client->dev, "Updating adm1029 data\n");
	460
	461	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
	462	data->temp[nr] =
	463	i2c_smbus_read_byte_data(client,
	464	ADM1029_REG_TEMP[nr]);
	465	}
	466	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
	467	data->fan[nr] =
	468	i2c_smbus_read_byte_data(client,
	469	ADM1029_REG_FAN[nr]);
	470	}
	471	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
	472	data->fan_div[nr] =
	473	i2c_smbus_read_byte_data(client,
	474	ADM1029_REG_FAN_DIV[nr]);
	475	}
	476
	477	data->last_updated = jiffies;
	478	data->valid = 1;
	479	}
	480
	481	mutex_unlock(&data->update_lock);
	482
	483	return data;
	484	}
	485
	486	/*
	487	Common module stuff
	488	*/
	489	static int __init sensors_adm1029_init(void)
	490	{
	491
	492	return i2c_add_driver(&adm1029_driver);
	493	}
	494
	495	static void __exit sensors_adm1029_exit(void)
	496	{
497
498	i2c_del_driver(&adm1029_driver);
499	}
500
501	MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
502	MODULE_DESCRIPTION("adm1029 driver");
503	MODULE_LICENSE("GPL v2");
504
505	module_init(sensors_adm1029_init);
506	module_exit(sensors_adm1029_exit);