[deliverable/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.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#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/regmap.h>

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

enum emc1403_chip { emc1402, emc1403, emc1404 };

struct thermal_data {
	struct regmap *regmap;
	struct mutex mutex;
	const struct attribute_group *groups[4];
};

static ssize_t show_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct thermal_data *data = dev_get_drvdata(dev);
	unsigned int val;
	int retval;

	retval = regmap_read(data->regmap, sda->index, &val);
	if (retval < 0)
		return retval;
	return sprintf(buf, "%d000\n", val);
}

static ssize_t show_bit(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	struct thermal_data *data = dev_get_drvdata(dev);
	unsigned int val;
	int retval;

	retval = regmap_read(data->regmap, sda->nr, &val);
	if (retval < 0)
		return retval;
	return sprintf(buf, "%d\n", !!(val & sda->index));
}

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 thermal_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int retval;

	if (kstrtoul(buf, 10, &val))
		return -EINVAL;
	retval = regmap_write(data->regmap, 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 sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	struct thermal_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int retval;

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

	retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
				    val ? sda->index : 0);
	if (retval < 0)
		return retval;
	return count;
}

static ssize_t show_hyst(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct thermal_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = data->regmap;
	unsigned int limit;
	unsigned int hyst;
	int retval;

	retval = regmap_read(regmap, sda->index, &limit);
	if (retval < 0)
		return retval;

	retval = regmap_read(regmap, 0x21, &hyst);
	if (retval < 0)
		return retval;

	return sprintf(buf, "%d000\n", limit - hyst);
}

static ssize_t store_hyst(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct thermal_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = data->regmap;
	unsigned int limit;
	int retval;
	int hyst;
	unsigned long val;

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

	mutex_lock(&data->mutex);
	retval = regmap_read(regmap, sda->index, &limit);
	if (retval < 0)
		goto fail;

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

	retval = regmap_write(regmap, 0x21, hyst);
	if (retval == 0)
		retval = count;
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_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x02);
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, show_hyst, NULL, 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_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x04);
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, show_hyst, NULL, 0x1A);

static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x2D);
static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x2C);
static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x30);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 0x2A);
static SENSOR_DEVICE_ATTR_2(temp4_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x08);
static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x08);
static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x08);
static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x08);
static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO, show_hyst, NULL, 0x30);

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

static struct attribute *emc1402_attrs[] = {
	&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_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_crit_hyst.dev_attr.attr,

	&sensor_dev_attr_power_state.dev_attr.attr,
	NULL
};

static const struct attribute_group emc1402_group = {
		.attrs = emc1402_attrs,
};

static struct attribute *emc1403_attrs[] = {
	&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_temp2_fault.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_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_fault.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,
	NULL
};

static const struct attribute_group emc1403_group = {
	.attrs = emc1403_attrs,
};

static struct attribute *emc1404_attrs[] = {
	&sensor_dev_attr_temp4_min.dev_attr.attr,
	&sensor_dev_attr_temp4_max.dev_attr.attr,
	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	&sensor_dev_attr_temp4_input.dev_attr.attr,
	&sensor_dev_attr_temp4_fault.dev_attr.attr,
	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
	NULL
};

static const struct attribute_group emc1404_group = {
	.attrs = emc1404_attrs,
};

/*
 * EMC14x2 uses a different register and different bits to report alarm and
 * fault status. For simplicity, provide a separate attribute group for this
 * chip series.
 * Since we can not re-use the same attribute names, create a separate attribute
 * array.
 */
static struct sensor_device_attribute_2 emc1402_alarms[] = {
	SENSOR_ATTR_2(temp1_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x20),
	SENSOR_ATTR_2(temp1_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x40),
	SENSOR_ATTR_2(temp1_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x01),

	SENSOR_ATTR_2(temp2_fault, S_IRUGO, show_bit, NULL, 0x02, 0x04),
	SENSOR_ATTR_2(temp2_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x08),
	SENSOR_ATTR_2(temp2_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x10),
	SENSOR_ATTR_2(temp2_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x02),
};

static struct attribute *emc1402_alarm_attrs[] = {
	&emc1402_alarms[0].dev_attr.attr,
	&emc1402_alarms[1].dev_attr.attr,
	&emc1402_alarms[2].dev_attr.attr,
	&emc1402_alarms[3].dev_attr.attr,
	&emc1402_alarms[4].dev_attr.attr,
	&emc1402_alarms[5].dev_attr.attr,
	&emc1402_alarms[6].dev_attr.attr,
	NULL,
};

static const struct attribute_group emc1402_alarm_group = {
	.attrs = emc1402_alarm_attrs,
};

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 0x20:
		strlcpy(info->type, "emc1402", I2C_NAME_SIZE);
		break;
	case 0x21:
		strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
		break;
	case 0x22:
		strlcpy(info->type, "emc1422", I2C_NAME_SIZE);
		break;
	case 0x23:
		strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
		break;
	case 0x25:
		strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
		break;
	case 0x27:
		strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
		break;
	default:
		return -ENODEV;
	}

	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
	if (id < 0x01 || id > 0x04)
		return -ENODEV;

	return 0;
}

static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x00:	/* internal diode high byte */
	case 0x01:	/* external diode 1 high byte */
	case 0x02:	/* status */
	case 0x10:	/* external diode 1 low byte */
	case 0x1b:	/* external diode fault */
	case 0x23:	/* external diode 2 high byte */
	case 0x24:	/* external diode 2 low byte */
	case 0x29:	/* internal diode low byte */
	case 0x2a:	/* externl diode 3 high byte */
	case 0x2b:	/* external diode 3 low byte */
	case 0x35:	/* high limit status */
	case 0x36:	/* low limit status */
	case 0x37:	/* therm limit status */
		return true;
	default:
		return false;
	}
}

static struct regmap_config emc1403_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = emc1403_regmap_is_volatile,
};

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

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

	data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
	if (IS_ERR(data->regmap))
		return PTR_ERR(data->regmap);

	mutex_init(&data->mutex);

	switch (id->driver_data) {
	case emc1404:
		data->groups[2] = &emc1404_group;
	case emc1403:
		data->groups[1] = &emc1403_group;
	case emc1402:
		data->groups[0] = &emc1402_group;
	}

	if (id->driver_data == emc1402)
		data->groups[1] = &emc1402_alarm_group;

	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
							   client->name, data,
							   data->groups);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	dev_info(&client->dev, "%s Thermal chip found\n", id->name);
	return 0;
}

static const unsigned short emc1403_address_list[] = {
	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
};

/* Last digit of chip name indicates number of channels */
static const struct i2c_device_id emc1403_idtable[] = {
	{ "emc1402", emc1402 },
	{ "emc1403", emc1403 },
	{ "emc1404", emc1404 },
	{ "emc1422", emc1402 },
	{ "emc1423", emc1403 },
	{ "emc1424", emc1404 },
	{ }
};
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,
	.id_table = emc1403_idtable,
	.address_list = emc1403_address_list,
};

module_i2c_driver(sensor_emc1403);

MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
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	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dac6831e KT	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/slab.h>
	26	#include <linux/i2c.h>
	27	#include <linux/hwmon.h>
	28	#include <linux/hwmon-sysfs.h>
	29	#include <linux/err.h>
	30	#include <linux/sysfs.h>
	31	#include <linux/mutex.h>
4cab259f	32	#include <linux/regmap.h>
dac6831e KT	33
	34	#define THERMAL_PID_REG 0xfd
	35	#define THERMAL_SMSC_ID_REG 0xfe
	36	#define THERMAL_REVISION_REG 0xff
	37
be7f5c4d JG	38	enum emc1403_chip { emc1402, emc1403, emc1404 };
be7f5c4d JG	39
dac6831e	40	struct thermal_data {
4cab259f	41	struct regmap *regmap;
dac6831e	42	struct mutex mutex;
4cab259f	43	const struct attribute_group *groups[4];
dac6831e KT	44	};
	45
	46	static ssize_t show_temp(struct device *dev,
	47	struct device_attribute attr, char buf)
	48	{
dac6831e	49	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	50	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f	51	unsigned int val;
454aee17	52	int retval;
dac6831e	53
4cab259f	54	retval = regmap_read(data->regmap, sda->index, &val);
dac6831e KT	55	if (retval < 0)
dac6831e KT	56	return retval;
4cab259f	57	return sprintf(buf, "%d000\n", val);
dac6831e KT	58	}
	59
	60	static ssize_t show_bit(struct device *dev,
	61	struct device_attribute attr, char buf)
	62	{
dac6831e	63	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
454aee17	64	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f	65	unsigned int val;
454aee17	66	int retval;
dac6831e	67
4cab259f	68	retval = regmap_read(data->regmap, sda->nr, &val);
dac6831e KT	69	if (retval < 0)
dac6831e KT	70	return retval;
4cab259f	71	return sprintf(buf, "%d\n", !!(val & sda->index));
dac6831e KT	72	}
	73
	74	static ssize_t store_temp(struct device *dev,
	75	struct device_attribute attr, const char buf, size_t count)
	76	{
	77	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	78	struct thermal_data *data = dev_get_drvdata(dev);
dac6831e KT	79	unsigned long val;
	80	int retval;
	81
179c4fdb	82	if (kstrtoul(buf, 10, &val))
dac6831e	83	return -EINVAL;
4cab259f GR	84	retval = regmap_write(data->regmap, sda->index,
4cab259f GR	85	DIV_ROUND_CLOSEST(val, 1000));
dac6831e KT	86	if (retval < 0)
	87	return retval;
	88	return count;
	89	}
	90
960f12f4 AC	91	static ssize_t store_bit(struct device *dev,
	92	struct device_attribute attr, const char buf, size_t count)
	93	{
960f12f4	94	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
454aee17	95	struct thermal_data *data = dev_get_drvdata(dev);
960f12f4 AC	96	unsigned long val;
	97	int retval;
	98
179c4fdb	99	if (kstrtoul(buf, 10, &val))
960f12f4 AC	100	return -EINVAL;
960f12f4 AC	101
4cab259f GR	102	retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
4cab259f GR	103	val ? sda->index : 0);
960f12f4	104	if (retval < 0)
4cab259f GR	105	return retval;
4cab259f GR	106	return count;
960f12f4 AC	107	}
960f12f4 AC	108
dac6831e KT	109	static ssize_t show_hyst(struct device *dev,
	110	struct device_attribute attr, char buf)
	111	{
dac6831e	112	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	113	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f GR	114	struct regmap *regmap = data->regmap;
	115	unsigned int limit;
	116	unsigned int hyst;
dac6831e	117	int retval;
dac6831e	118
4cab259f	119	retval = regmap_read(regmap, sda->index, &limit);
dac6831e KT	120	if (retval < 0)
	121	return retval;
	122
4cab259f GR	123	retval = regmap_read(regmap, 0x21, &hyst);
	124	if (retval < 0)
	125	return retval;
	126
	127	return sprintf(buf, "%d000\n", limit - hyst);
dac6831e KT	128	}
	129
	130	static ssize_t store_hyst(struct device *dev,
	131	struct device_attribute attr, const char buf, size_t count)
	132	{
dac6831e	133	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	134	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f GR	135	struct regmap *regmap = data->regmap;
4cab259f GR	136	unsigned int limit;
dac6831e KT	137	int retval;
	138	int hyst;
	139	unsigned long val;
	140
179c4fdb	141	if (kstrtoul(buf, 10, &val))
dac6831e KT	142	return -EINVAL;
	143
	144	mutex_lock(&data->mutex);
4cab259f	145	retval = regmap_read(regmap, sda->index, &limit);
dac6831e KT	146	if (retval < 0)
	147	goto fail;
	148
4cab259f	149	hyst = limit * 1000 - val;
dac6831e KT	150	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
	151	if (hyst < 0 \|\| hyst > 255) {
	152	retval = -ERANGE;
	153	goto fail;
	154	}
	155
4cab259f GR	156	retval = regmap_write(regmap, 0x21, hyst);
4cab259f GR	157	if (retval == 0)
dac6831e	158	retval = count;
dac6831e KT	159	fail:
	160	mutex_unlock(&data->mutex);
	161	return retval;
	162	}
	163
	164	/*
	165	* Sensors. We pass the actual i2c register to the methods.
	166	*/
	167
	168	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO \| S_IWUSR,
	169	show_temp, store_temp, 0x06);
	170	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO \| S_IWUSR,
	171	show_temp, store_temp, 0x05);
	172	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO \| S_IWUSR,
	173	show_temp, store_temp, 0x20);
	174	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
	175	static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
	176	show_bit, NULL, 0x36, 0x01);
	177	static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
	178	show_bit, NULL, 0x35, 0x01);
	179	static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
	180	show_bit, NULL, 0x37, 0x01);
	181	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO \| S_IWUSR,
	182	show_hyst, store_hyst, 0x20);
	183
	184	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO \| S_IWUSR,
	185	show_temp, store_temp, 0x08);
	186	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO \| S_IWUSR,
	187	show_temp, store_temp, 0x07);
	188	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO \| S_IWUSR,
	189	show_temp, store_temp, 0x19);
	190	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
d8850c19	191	static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x02);
dac6831e KT	192	static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
	193	show_bit, NULL, 0x36, 0x02);
	194	static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
	195	show_bit, NULL, 0x35, 0x02);
	196	static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
	197	show_bit, NULL, 0x37, 0x02);
84899d39	198	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_hyst, NULL, 0x19);
dac6831e KT	199
	200	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO \| S_IWUSR,
	201	show_temp, store_temp, 0x16);
	202	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO \| S_IWUSR,
	203	show_temp, store_temp, 0x15);
	204	static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO \| S_IWUSR,
	205	show_temp, store_temp, 0x1A);
	206	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
d8850c19	207	static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x04);
dac6831e KT	208	static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
	209	show_bit, NULL, 0x36, 0x04);
	210	static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
	211	show_bit, NULL, 0x35, 0x04);
	212	static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
	213	show_bit, NULL, 0x37, 0x04);
84899d39	214	static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_hyst, NULL, 0x1A);
dac6831e	215
0011ddfe GR	216	static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO \| S_IWUSR,
	217	show_temp, store_temp, 0x2D);
	218	static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO \| S_IWUSR,
	219	show_temp, store_temp, 0x2C);
	220	static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO \| S_IWUSR,
	221	show_temp, store_temp, 0x30);
	222	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 0x2A);
d8850c19	223	static SENSOR_DEVICE_ATTR_2(temp4_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x08);
0011ddfe GR	224	static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO,
	225	show_bit, NULL, 0x36, 0x08);
	226	static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO,
	227	show_bit, NULL, 0x35, 0x08);
	228	static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO,
	229	show_bit, NULL, 0x37, 0x08);
84899d39	230	static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO, show_hyst, NULL, 0x30);
0011ddfe	231
960f12f4 AC	232	static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO \| S_IWUSR,
	233	show_bit, store_bit, 0x03, 0x40);
	234
be7f5c4d	235	static struct attribute *emc1402_attrs[] = {
dac6831e KT	236	&sensor_dev_attr_temp1_min.dev_attr.attr,
	237	&sensor_dev_attr_temp1_max.dev_attr.attr,
	238	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	239	&sensor_dev_attr_temp1_input.dev_attr.attr,
dac6831e	240	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
be7f5c4d	241
dac6831e KT	242	&sensor_dev_attr_temp2_min.dev_attr.attr,
	243	&sensor_dev_attr_temp2_max.dev_attr.attr,
	244	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	245	&sensor_dev_attr_temp2_input.dev_attr.attr,
be7f5c4d JG	246	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	247
	248	&sensor_dev_attr_power_state.dev_attr.attr,
	249	NULL
	250	};
	251
	252	static const struct attribute_group emc1402_group = {
	253	.attrs = emc1402_attrs,
	254	};
	255
	256	static struct attribute *emc1403_attrs[] = {
	257	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	258	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	259	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	260
d8850c19	261	&sensor_dev_attr_temp2_fault.dev_attr.attr,
dac6831e KT	262	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	263	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	264	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
be7f5c4d	265
dac6831e KT	266	&sensor_dev_attr_temp3_min.dev_attr.attr,
	267	&sensor_dev_attr_temp3_max.dev_attr.attr,
	268	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	269	&sensor_dev_attr_temp3_input.dev_attr.attr,
d8850c19	270	&sensor_dev_attr_temp3_fault.dev_attr.attr,
dac6831e KT	271	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	272	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	273	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	274	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
	275	NULL
	276	};
0011ddfe GR	277
	278	static const struct attribute_group emc1403_group = {
	279	.attrs = emc1403_attrs,
	280	};
	281
	282	static struct attribute *emc1404_attrs[] = {
	283	&sensor_dev_attr_temp4_min.dev_attr.attr,
	284	&sensor_dev_attr_temp4_max.dev_attr.attr,
	285	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	286	&sensor_dev_attr_temp4_input.dev_attr.attr,
d8850c19	287	&sensor_dev_attr_temp4_fault.dev_attr.attr,
0011ddfe GR	288	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	289	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	290	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
	291	&sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
	292	NULL
	293	};
	294
	295	static const struct attribute_group emc1404_group = {
	296	.attrs = emc1404_attrs,
	297	};
dac6831e	298
03f49f64 GR	299	/*
	300	* EMC14x2 uses a different register and different bits to report alarm and
	301	* fault status. For simplicity, provide a separate attribute group for this
	302	* chip series.
	303	* Since we can not re-use the same attribute names, create a separate attribute
	304	* array.
	305	*/
	306	static struct sensor_device_attribute_2 emc1402_alarms[] = {
	307	SENSOR_ATTR_2(temp1_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x20),
	308	SENSOR_ATTR_2(temp1_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x40),
	309	SENSOR_ATTR_2(temp1_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x01),
	310
	311	SENSOR_ATTR_2(temp2_fault, S_IRUGO, show_bit, NULL, 0x02, 0x04),
	312	SENSOR_ATTR_2(temp2_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x08),
	313	SENSOR_ATTR_2(temp2_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x10),
	314	SENSOR_ATTR_2(temp2_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x02),
	315	};
	316
	317	static struct attribute *emc1402_alarm_attrs[] = {
	318	&emc1402_alarms[0].dev_attr.attr,
	319	&emc1402_alarms[1].dev_attr.attr,
	320	&emc1402_alarms[2].dev_attr.attr,
	321	&emc1402_alarms[3].dev_attr.attr,
	322	&emc1402_alarms[4].dev_attr.attr,
	323	&emc1402_alarms[5].dev_attr.attr,
	324	&emc1402_alarms[6].dev_attr.attr,
	325	NULL,
	326	};
	327
	328	static const struct attribute_group emc1402_alarm_group = {
	329	.attrs = emc1402_alarm_attrs,
	330	};
	331
dac6831e KT	332	static int emc1403_detect(struct i2c_client *client,
	333	struct i2c_board_info *info)
	334	{
	335	int id;
7a1b76f2	336	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
dac6831e KT	337
	338	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	339	if (id != 0x5d)
	340	return -ENODEV;
	341
7a1b76f2 JL	342	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
7a1b76f2 JL	343	switch (id) {
be7f5c4d JG	344	case 0x20:
	345	strlcpy(info->type, "emc1402", I2C_NAME_SIZE);
	346	break;
7a1b76f2 JL	347	case 0x21:
	348	strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
	349	break;
be7f5c4d JG	350	case 0x22:
	351	strlcpy(info->type, "emc1422", I2C_NAME_SIZE);
	352	break;
7a1b76f2 JL	353	case 0x23:
	354	strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
	355	break;
0011ddfe GR	356	case 0x25:
	357	strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
	358	break;
	359	case 0x27:
	360	strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
	361	break;
7a1b76f2	362	default:
dac6831e	363	return -ENODEV;
7a1b76f2	364	}
dac6831e KT	365
dac6831e KT	366	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
3a18e139	367	if (id < 0x01 \|\| id > 0x04)
dac6831e KT	368	return -ENODEV;
dac6831e KT	369
dac6831e KT	370	return 0;
	371	}
	372
4cab259f GR	373	static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
	374	{
	375	switch (reg) {
	376	case 0x00: /* internal diode high byte */
	377	case 0x01: /* external diode 1 high byte */
	378	case 0x02: /* status */
	379	case 0x10: /* external diode 1 low byte */
	380	case 0x1b: /* external diode fault */
	381	case 0x23: /* external diode 2 high byte */
	382	case 0x24: /* external diode 2 low byte */
	383	case 0x29: /* internal diode low byte */
	384	case 0x2a: /* externl diode 3 high byte */
	385	case 0x2b: /* external diode 3 low byte */
	386	case 0x35: /* high limit status */
	387	case 0x36: /* low limit status */
	388	case 0x37: /* therm limit status */
	389	return true;
	390	default:
	391	return false;
	392	}
	393	}
	394
	395	static struct regmap_config emc1403_regmap_config = {
	396	.reg_bits = 8,
	397	.val_bits = 8,
	398	.cache_type = REGCACHE_RBTREE,
	399	.volatile_reg = emc1403_regmap_is_volatile,
	400	};
	401
dac6831e KT	402	static int emc1403_probe(struct i2c_client *client,
	403	const struct i2c_device_id *id)
	404	{
dac6831e	405	struct thermal_data *data;
454aee17	406	struct device *hwmon_dev;
dac6831e	407
7b52eefe GR	408	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
	409	GFP_KERNEL);
	410	if (data == NULL)
dac6831e	411	return -ENOMEM;
dac6831e	412
4cab259f GR	413	data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
	414	if (IS_ERR(data->regmap))
	415	return PTR_ERR(data->regmap);
	416
dac6831e	417	mutex_init(&data->mutex);
dac6831e	418
be7f5c4d JG	419	switch (id->driver_data) {
	420	case emc1404:
	421	data->groups[2] = &emc1404_group;
	422	case emc1403:
	423	data->groups[1] = &emc1403_group;
	424	case emc1402:
	425	data->groups[0] = &emc1402_group;
	426	}
0011ddfe	427
03f49f64 GR	428	if (id->driver_data == emc1402)
	429	data->groups[1] = &emc1402_alarm_group;
	430
8759f904 JD	431	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
	432	client->name, data,
	433	data->groups);
454aee17 GR	434	if (IS_ERR(hwmon_dev))
454aee17 GR	435	return PTR_ERR(hwmon_dev);
dac6831e	436
0011ddfe	437	dev_info(&client->dev, "%s Thermal chip found\n", id->name);
dac6831e KT	438	return 0;
	439	}
	440
	441	static const unsigned short emc1403_address_list[] = {
be7f5c4d	442	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
dac6831e KT	443	};
dac6831e KT	444
be7f5c4d	445	/* Last digit of chip name indicates number of channels */
dac6831e	446	static const struct i2c_device_id emc1403_idtable[] = {
be7f5c4d JG	447	{ "emc1402", emc1402 },
	448	{ "emc1403", emc1403 },
	449	{ "emc1404", emc1404 },
	450	{ "emc1422", emc1402 },
	451	{ "emc1423", emc1403 },
	452	{ "emc1424", emc1404 },
dac6831e KT	453	{ }
	454	};
	455	MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
	456
	457	static struct i2c_driver sensor_emc1403 = {
	458	.class = I2C_CLASS_HWMON,
	459	.driver = {
	460	.name = "emc1403",
	461	},
	462	.detect = emc1403_detect,
	463	.probe = emc1403_probe,
dac6831e KT	464	.id_table = emc1403_idtable,
	465	.address_list = emc1403_address_list,
	466	};
	467
f0967eea	468	module_i2c_driver(sensor_emc1403);
dac6831e KT	469
	470	MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
	471	MODULE_DESCRIPTION("emc1403 Thermal Driver");
	472	MODULE_LICENSE("GPL v2");