[linux.git] / drivers / hwmon / emc1403.c

/*
 * emc1403.c - SMSC Thermal Driver
 *
 * Copyright (C) 2008 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * TODO
 *	-	cache alarm and critical limit registers
 *	-	add emc1404 support
 */

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

#define THERMAL_PID_REG		0xfd
#define THERMAL_SMSC_ID_REG	0xfe
#define THERMAL_REVISION_REG	0xff

struct thermal_data {
	struct device *hwmon_dev;
	struct mutex mutex;
	/*
	 * Cache the hyst value so we don't keep re-reading it. In theory
	 * we could cache it forever as nobody else should be writing it.
	 */
	u8 cached_hyst;
	unsigned long hyst_valid;
};

static ssize_t show_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval = i2c_smbus_read_byte_data(client, sda->index);

	if (retval < 0)
		return retval;
	return sprintf(buf, "%d000\n", retval);
}

static ssize_t show_bit(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	int retval = i2c_smbus_read_byte_data(client, sda->nr);

	if (retval < 0)
		return retval;
	retval &= sda->index;
	return sprintf(buf, "%d\n", retval ? 1 : 0);
}

static ssize_t store_temp(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int retval;

	if (kstrtoul(buf, 10, &val))
		return -EINVAL;
	retval = i2c_smbus_write_byte_data(client, sda->index,
					DIV_ROUND_CLOSEST(val, 1000));
	if (retval < 0)
		return retval;
	return count;
}

static ssize_t store_bit(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	unsigned long val;
	int retval;

	if (kstrtoul(buf, 10, &val))
		return -EINVAL;

	mutex_lock(&data->mutex);
	retval = i2c_smbus_read_byte_data(client, sda->nr);
	if (retval < 0)
		goto fail;

	retval &= ~sda->index;
	if (val)
		retval |= sda->index;

	retval = i2c_smbus_write_byte_data(client, sda->index, retval);
	if (retval == 0)
		retval = count;
fail:
	mutex_unlock(&data->mutex);
	return retval;
}

static ssize_t show_hyst(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval;
	int hyst;

	retval = i2c_smbus_read_byte_data(client, sda->index);
	if (retval < 0)
		return retval;

	if (time_after(jiffies, data->hyst_valid)) {
		hyst = i2c_smbus_read_byte_data(client, 0x21);
		if (hyst < 0)
			return retval;
		data->cached_hyst = hyst;
		data->hyst_valid = jiffies + HZ;
	}
	return sprintf(buf, "%d000\n", retval - data->cached_hyst);
}

static ssize_t store_hyst(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval;
	int hyst;
	unsigned long val;

	if (kstrtoul(buf, 10, &val))
		return -EINVAL;

	mutex_lock(&data->mutex);
	retval = i2c_smbus_read_byte_data(client, sda->index);
	if (retval < 0)
		goto fail;

	hyst = val - retval * 1000;
	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
	if (hyst < 0 || hyst > 255) {
		retval = -ERANGE;
		goto fail;
	}

	retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
	if (retval == 0) {
		retval = count;
		data->cached_hyst = hyst;
		data->hyst_valid = jiffies + HZ;
	}
fail:
	mutex_unlock(&data->mutex);
	return retval;
}

/*
 *	Sensors. We pass the actual i2c register to the methods.
 */

static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x06);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x05);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x20);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x01);
static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x01);
static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x01);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
	show_hyst, store_hyst, 0x20);

static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x08);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x07);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x19);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x02);
static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x02);
static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x02);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
	show_hyst, store_hyst, 0x19);

static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x16);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x15);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x1A);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x04);
static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x04);
static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x04);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
	show_hyst, store_hyst, 0x1A);

static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
	show_bit, store_bit, 0x03, 0x40);

static struct attribute *mid_att_thermal[] = {
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_power_state.dev_attr.attr,
	NULL
};

static const struct attribute_group m_thermal_gr = {
	.attrs = mid_att_thermal
};

static int emc1403_detect(struct i2c_client *client,
			struct i2c_board_info *info)
{
	int id;
	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */

	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	if (id != 0x5d)
		return -ENODEV;

	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
	switch (id) {
	case 0x21:
		strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
		break;
	case 0x23:
		strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
		break;
	/*
	 * Note: 0x25 is the 1404 which is very similar and this
	 * driver could be extended
	 */
	default:
		return -ENODEV;
	}

	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
	if (id != 0x01)
		return -ENODEV;

	return 0;
}

static int emc1403_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int res;
	struct thermal_data *data;

	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
			    GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	i2c_set_clientdata(client, data);
	mutex_init(&data->mutex);
	data->hyst_valid = jiffies - 1;		/* Expired */

	res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
	if (res) {
		dev_warn(&client->dev, "create group failed\n");
		return res;
	}
	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		res = PTR_ERR(data->hwmon_dev);
		dev_warn(&client->dev, "register hwmon dev failed\n");
		goto thermal_error;
	}
	dev_info(&client->dev, "EMC1403 Thermal chip found\n");
	return 0;

thermal_error:
	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
	return res;
}

static int emc1403_remove(struct i2c_client *client)
{
	struct thermal_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
	return 0;
}

static const unsigned short emc1403_address_list[] = {
	0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
};

static const struct i2c_device_id emc1403_idtable[] = {
	{ "emc1403", 0 },
	{ "emc1423", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, emc1403_idtable);

static struct i2c_driver sensor_emc1403 = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		.name = "emc1403",
	},
	.detect = emc1403_detect,
	.probe = emc1403_probe,
	.remove = emc1403_remove,
	.id_table = emc1403_idtable,
	.address_list = emc1403_address_list,
};

module_i2c_driver(sensor_emc1403);

MODULE_AUTHOR("Kalhan Trisal <[email protected]");
MODULE_DESCRIPTION("emc1403 Thermal Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
dac6831e KT	1	/*
	2	* emc1403.c - SMSC Thermal Driver
	3	*
	4	* Copyright (C) 2008 Intel Corp
	5	*
	6	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; if not, write to the Free Software Foundation, Inc.,
	19	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	20	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	21	*
	22	* TODO
	23	* - cache alarm and critical limit registers
	24	* - add emc1404 support
	25	*/
	26
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/slab.h>
	30	#include <linux/i2c.h>
	31	#include <linux/hwmon.h>
	32	#include <linux/hwmon-sysfs.h>
	33	#include <linux/err.h>
	34	#include <linux/sysfs.h>
	35	#include <linux/mutex.h>
dcd8f392	36	#include <linux/jiffies.h>
dac6831e KT	37
	38	#define THERMAL_PID_REG 0xfd
	39	#define THERMAL_SMSC_ID_REG 0xfe
	40	#define THERMAL_REVISION_REG 0xff
	41
	42	struct thermal_data {
	43	struct device *hwmon_dev;
	44	struct mutex mutex;
4bebced8 GR	45	/*
	46	* Cache the hyst value so we don't keep re-reading it. In theory
	47	* we could cache it forever as nobody else should be writing it.
	48	*/
dac6831e KT	49	u8 cached_hyst;
	50	unsigned long hyst_valid;
	51	};
	52
	53	static ssize_t show_temp(struct device *dev,
	54	struct device_attribute attr, char buf)
	55	{
	56	struct i2c_client *client = to_i2c_client(dev);
	57	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	58	int retval = i2c_smbus_read_byte_data(client, sda->index);
	59
	60	if (retval < 0)
	61	return retval;
	62	return sprintf(buf, "%d000\n", retval);
	63	}
	64
	65	static ssize_t show_bit(struct device *dev,
	66	struct device_attribute attr, char buf)
	67	{
	68	struct i2c_client *client = to_i2c_client(dev);
	69	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	70	int retval = i2c_smbus_read_byte_data(client, sda->nr);
	71
	72	if (retval < 0)
	73	return retval;
	74	retval &= sda->index;
	75	return sprintf(buf, "%d\n", retval ? 1 : 0);
	76	}
	77
	78	static ssize_t store_temp(struct device *dev,
	79	struct device_attribute attr, const char buf, size_t count)
	80	{
	81	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	82	struct i2c_client *client = to_i2c_client(dev);
	83	unsigned long val;
	84	int retval;
	85
179c4fdb	86	if (kstrtoul(buf, 10, &val))
dac6831e KT	87	return -EINVAL;
	88	retval = i2c_smbus_write_byte_data(client, sda->index,
	89	DIV_ROUND_CLOSEST(val, 1000));
	90	if (retval < 0)
	91	return retval;
	92	return count;
	93	}
	94
960f12f4 AC	95	static ssize_t store_bit(struct device *dev,
	96	struct device_attribute attr, const char buf, size_t count)
	97	{
	98	struct i2c_client *client = to_i2c_client(dev);
	99	struct thermal_data *data = i2c_get_clientdata(client);
	100	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	101	unsigned long val;
	102	int retval;
	103
179c4fdb	104	if (kstrtoul(buf, 10, &val))
960f12f4 AC	105	return -EINVAL;
	106
	107	mutex_lock(&data->mutex);
	108	retval = i2c_smbus_read_byte_data(client, sda->nr);
	109	if (retval < 0)
	110	goto fail;
	111
	112	retval &= ~sda->index;
	113	if (val)
	114	retval \|= sda->index;
	115
	116	retval = i2c_smbus_write_byte_data(client, sda->index, retval);
	117	if (retval == 0)
	118	retval = count;
	119	fail:
	120	mutex_unlock(&data->mutex);
	121	return retval;
	122	}
	123
dac6831e KT	124	static ssize_t show_hyst(struct device *dev,
	125	struct device_attribute attr, char buf)
	126	{
	127	struct i2c_client *client = to_i2c_client(dev);
	128	struct thermal_data *data = i2c_get_clientdata(client);
	129	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	130	int retval;
	131	int hyst;
	132
	133	retval = i2c_smbus_read_byte_data(client, sda->index);
	134	if (retval < 0)
	135	return retval;
	136
	137	if (time_after(jiffies, data->hyst_valid)) {
	138	hyst = i2c_smbus_read_byte_data(client, 0x21);
	139	if (hyst < 0)
	140	return retval;
	141	data->cached_hyst = hyst;
	142	data->hyst_valid = jiffies + HZ;
	143	}
	144	return sprintf(buf, "%d000\n", retval - data->cached_hyst);
	145	}
	146
	147	static ssize_t store_hyst(struct device *dev,
	148	struct device_attribute attr, const char buf, size_t count)
	149	{
	150	struct i2c_client *client = to_i2c_client(dev);
	151	struct thermal_data *data = i2c_get_clientdata(client);
	152	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	153	int retval;
	154	int hyst;
	155	unsigned long val;
	156
179c4fdb	157	if (kstrtoul(buf, 10, &val))
dac6831e KT	158	return -EINVAL;
	159
	160	mutex_lock(&data->mutex);
	161	retval = i2c_smbus_read_byte_data(client, sda->index);
	162	if (retval < 0)
	163	goto fail;
	164
	165	hyst = val - retval * 1000;
	166	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
	167	if (hyst < 0 \|\| hyst > 255) {
	168	retval = -ERANGE;
	169	goto fail;
	170	}
	171
	172	retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
	173	if (retval == 0) {
	174	retval = count;
	175	data->cached_hyst = hyst;
	176	data->hyst_valid = jiffies + HZ;
	177	}
	178	fail:
	179	mutex_unlock(&data->mutex);
	180	return retval;
	181	}
	182
	183	/*
	184	* Sensors. We pass the actual i2c register to the methods.
	185	*/
	186
	187	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO \| S_IWUSR,
	188	show_temp, store_temp, 0x06);
	189	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO \| S_IWUSR,
	190	show_temp, store_temp, 0x05);
	191	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO \| S_IWUSR,
	192	show_temp, store_temp, 0x20);
	193	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
	194	static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
	195	show_bit, NULL, 0x36, 0x01);
	196	static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
	197	show_bit, NULL, 0x35, 0x01);
	198	static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
	199	show_bit, NULL, 0x37, 0x01);
	200	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO \| S_IWUSR,
	201	show_hyst, store_hyst, 0x20);
	202
	203	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO \| S_IWUSR,
	204	show_temp, store_temp, 0x08);
	205	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO \| S_IWUSR,
	206	show_temp, store_temp, 0x07);
	207	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO \| S_IWUSR,
	208	show_temp, store_temp, 0x19);
	209	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
	210	static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
	211	show_bit, NULL, 0x36, 0x02);
	212	static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
	213	show_bit, NULL, 0x35, 0x02);
	214	static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
	215	show_bit, NULL, 0x37, 0x02);
	216	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO \| S_IWUSR,
	217	show_hyst, store_hyst, 0x19);
	218
	219	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO \| S_IWUSR,
	220	show_temp, store_temp, 0x16);
	221	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO \| S_IWUSR,
222	show_temp, store_temp, 0x15);
223	static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO \| S_IWUSR,
224	show_temp, store_temp, 0x1A);
225	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
226	static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
227	show_bit, NULL, 0x36, 0x04);
228	static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
229	show_bit, NULL, 0x35, 0x04);
230	static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
231	show_bit, NULL, 0x37, 0x04);
232	static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO \| S_IWUSR,
233	show_hyst, store_hyst, 0x1A);
234
960f12f4 AC	235	static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO \| S_IWUSR,
	236	show_bit, store_bit, 0x03, 0x40);
	237
dac6831e KT	238	static struct attribute *mid_att_thermal[] = {
	239	&sensor_dev_attr_temp1_min.dev_attr.attr,
	240	&sensor_dev_attr_temp1_max.dev_attr.attr,
	241	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	242	&sensor_dev_attr_temp1_input.dev_attr.attr,
	243	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	244	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	245	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	246	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	247	&sensor_dev_attr_temp2_min.dev_attr.attr,
	248	&sensor_dev_attr_temp2_max.dev_attr.attr,
	249	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	250	&sensor_dev_attr_temp2_input.dev_attr.attr,
	251	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	252	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	253	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	254	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	255	&sensor_dev_attr_temp3_min.dev_attr.attr,
	256	&sensor_dev_attr_temp3_max.dev_attr.attr,
	257	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	258	&sensor_dev_attr_temp3_input.dev_attr.attr,
	259	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	260	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	261	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	262	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
960f12f4	263	&sensor_dev_attr_power_state.dev_attr.attr,
dac6831e KT	264	NULL
	265	};
	266
	267	static const struct attribute_group m_thermal_gr = {
	268	.attrs = mid_att_thermal
	269	};
	270
	271	static int emc1403_detect(struct i2c_client *client,
	272	struct i2c_board_info *info)
	273	{
	274	int id;
7a1b76f2	275	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
dac6831e KT	276
	277	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	278	if (id != 0x5d)
	279	return -ENODEV;
	280
7a1b76f2 JL	281	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
	282	switch (id) {
	283	case 0x21:
	284	strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
	285	break;
	286	case 0x23:
	287	strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
	288	break;
4bebced8 GR	289	/*
	290	* Note: 0x25 is the 1404 which is very similar and this
	291	* driver could be extended
	292	*/
7a1b76f2	293	default:
dac6831e	294	return -ENODEV;
7a1b76f2	295	}
dac6831e KT	296
	297	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
	298	if (id != 0x01)
	299	return -ENODEV;
	300
dac6831e KT	301	return 0;
	302	}
	303
	304	static int emc1403_probe(struct i2c_client *client,
	305	const struct i2c_device_id *id)
	306	{
	307	int res;
	308	struct thermal_data *data;
	309
7b52eefe GR	310	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
	311	GFP_KERNEL);
	312	if (data == NULL)
dac6831e	313	return -ENOMEM;
dac6831e KT	314
	315	i2c_set_clientdata(client, data);
	316	mutex_init(&data->mutex);
	317	data->hyst_valid = jiffies - 1; /* Expired */
	318
	319	res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
	320	if (res) {
	321	dev_warn(&client->dev, "create group failed\n");
7b52eefe	322	return res;
dac6831e KT	323	}
	324	data->hwmon_dev = hwmon_device_register(&client->dev);
	325	if (IS_ERR(data->hwmon_dev)) {
	326	res = PTR_ERR(data->hwmon_dev);
	327	dev_warn(&client->dev, "register hwmon dev failed\n");
7b52eefe	328	goto thermal_error;
dac6831e KT	329	}
dac6831e KT	330	dev_info(&client->dev, "EMC1403 Thermal chip found\n");
7b52eefe	331	return 0;
dac6831e	332
7b52eefe	333	thermal_error:
dac6831e	334	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
dac6831e KT	335	return res;
	336	}
	337
	338	static int emc1403_remove(struct i2c_client *client)
	339	{
	340	struct thermal_data *data = i2c_get_clientdata(client);
	341
	342	hwmon_device_unregister(data->hwmon_dev);
	343	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
dac6831e KT	344	return 0;
	345	}
	346
	347	static const unsigned short emc1403_address_list[] = {
bcf721d1	348	0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
dac6831e KT	349	};
	350
	351	static const struct i2c_device_id emc1403_idtable[] = {
	352	{ "emc1403", 0 },
7a1b76f2	353	{ "emc1423", 0 },
dac6831e KT	354	{ }
	355	};
	356	MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
	357
	358	static struct i2c_driver sensor_emc1403 = {
	359	.class = I2C_CLASS_HWMON,
	360	.driver = {
	361	.name = "emc1403",
	362	},
	363	.detect = emc1403_detect,
	364	.probe = emc1403_probe,
	365	.remove = emc1403_remove,
	366	.id_table = emc1403_idtable,
	367	.address_list = emc1403_address_list,
	368	};
	369
f0967eea	370	module_i2c_driver(sensor_emc1403);
dac6831e KT	371
	372	MODULE_AUTHOR("Kalhan Trisal <[email protected]");
	373	MODULE_DESCRIPTION("emc1403 Thermal Driver");
	374	MODULE_LICENSE("GPL v2");