[linux-2.6-block.git] / drivers / hwmon / emc1403.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * emc1403.c - SMSC Thermal Driver
 *
 * Copyright (C) 2008 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#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 temp_show(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 bit_show(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 temp_store(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 bit_store(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_common(struct device *dev,
				struct device_attribute *attr, char *buf,
				bool is_min)
{
	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", is_min ? limit + hyst : limit - hyst);
}

static ssize_t hyst_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	return show_hyst_common(dev, attr, buf, false);
}

static ssize_t min_hyst_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	return show_hyst_common(dev, attr, buf, true);
}

static ssize_t hyst_store(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 = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
	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_RW(temp1_min, temp, 0x06);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 0x05);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, 0x20);
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0x00);
static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, bit, 0x36, 0x01);
static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, bit, 0x35, 0x01);
static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, bit, 0x37, 0x01);
static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, min_hyst, 0x06);
static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, hyst, 0x05);
static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0x20);

static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, 0x08);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 0x07);
static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, 0x19);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 0x01);
static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, bit, 0x1b, 0x02);
static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, bit, 0x36, 0x02);
static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, bit, 0x35, 0x02);
static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, bit, 0x37, 0x02);
static SENSOR_DEVICE_ATTR_RO(temp2_min_hyst, min_hyst, 0x08);
static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, hyst, 0x07);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, hyst, 0x19);

static SENSOR_DEVICE_ATTR_RW(temp3_min, temp, 0x16);
static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 0x15);
static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 0x1A);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 0x23);
static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, bit, 0x1b, 0x04);
static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, bit, 0x36, 0x04);
static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, bit, 0x35, 0x04);
static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, bit, 0x37, 0x04);
static SENSOR_DEVICE_ATTR_RO(temp3_min_hyst, min_hyst, 0x16);
static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, hyst, 0x15);
static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, hyst, 0x1A);

static SENSOR_DEVICE_ATTR_RW(temp4_min, temp, 0x2D);
static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 0x2C);
static SENSOR_DEVICE_ATTR_RW(temp4_crit, temp, 0x30);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 0x2A);
static SENSOR_DEVICE_ATTR_2_RO(temp4_fault, bit, 0x1b, 0x08);
static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, bit, 0x36, 0x08);
static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, bit, 0x35, 0x08);
static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, bit, 0x37, 0x08);
static SENSOR_DEVICE_ATTR_RO(temp4_min_hyst, min_hyst, 0x2D);
static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, hyst, 0x2C);
static SENSOR_DEVICE_ATTR_RO(temp4_crit_hyst, hyst, 0x30);

static SENSOR_DEVICE_ATTR_2_RW(power_state, 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_min_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.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_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_max_hyst.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_min_hyst.dev_attr.attr,
	&sensor_dev_attr_temp3_max_hyst.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_min_hyst.dev_attr.attr,
	&sensor_dev_attr_temp4_max_hyst.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_RO(temp1_min_alarm, bit, 0x02, 0x20),
	SENSOR_ATTR_2_RO(temp1_max_alarm, bit, 0x02, 0x40),
	SENSOR_ATTR_2_RO(temp1_crit_alarm, bit, 0x02, 0x01),

	SENSOR_ATTR_2_RO(temp2_fault, bit, 0x02, 0x04),
	SENSOR_ATTR_2_RO(temp2_min_alarm, bit, 0x02, 0x08),
	SENSOR_ATTR_2_RO(temp2_max_alarm, bit, 0x02, 0x10),
	SENSOR_ATTR_2_RO(temp2_crit_alarm, bit, 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:
		strscpy(info->type, "emc1402", I2C_NAME_SIZE);
		break;
	case 0x21:
		strscpy(info->type, "emc1403", I2C_NAME_SIZE);
		break;
	case 0x22:
		strscpy(info->type, "emc1422", I2C_NAME_SIZE);
		break;
	case 0x23:
		strscpy(info->type, "emc1423", I2C_NAME_SIZE);
		break;
	case 0x25:
		strscpy(info->type, "emc1404", I2C_NAME_SIZE);
		break;
	case 0x27:
		strscpy(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 const struct regmap_config emc1403_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = emc1403_regmap_is_volatile,
};

static const struct i2c_device_id emc1403_idtable[];

static int emc1403_probe(struct i2c_client *client)
{
	struct thermal_data *data;
	struct device *hwmon_dev;
	const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);

	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;
		fallthrough;
	case emc1403:
		data->groups[1] = &emc1403_group;
		fallthrough;
	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 },
	{ "emc1412", emc1402 },
	{ "emc1413", emc1403 },
	{ "emc1414", 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_new = 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
873e65bc	1	// SPDX-License-Identifier: GPL-2.0-only
dac6831e KT	2	/*
	3	* emc1403.c - SMSC Thermal Driver
	4	*
	5	* Copyright (C) 2008 Intel Corp
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
dac6831e	9	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dac6831e KT	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/slab.h>
	15	#include <linux/i2c.h>
	16	#include <linux/hwmon.h>
	17	#include <linux/hwmon-sysfs.h>
	18	#include <linux/err.h>
	19	#include <linux/sysfs.h>
	20	#include <linux/mutex.h>
4cab259f	21	#include <linux/regmap.h>
dac6831e KT	22
	23	#define THERMAL_PID_REG 0xfd
	24	#define THERMAL_SMSC_ID_REG 0xfe
	25	#define THERMAL_REVISION_REG 0xff
	26
be7f5c4d JG	27	enum emc1403_chip { emc1402, emc1403, emc1404 };
be7f5c4d JG	28
dac6831e	29	struct thermal_data {
4cab259f	30	struct regmap *regmap;
dac6831e	31	struct mutex mutex;
4cab259f	32	const struct attribute_group *groups[4];
dac6831e KT	33	};
dac6831e KT	34
ae66d2d9 GR	35	static ssize_t temp_show(struct device dev, struct device_attribute attr,
ae66d2d9 GR	36	char *buf)
dac6831e	37	{
dac6831e	38	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	39	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f	40	unsigned int val;
454aee17	41	int retval;
dac6831e	42
4cab259f	43	retval = regmap_read(data->regmap, sda->index, &val);
dac6831e KT	44	if (retval < 0)
dac6831e KT	45	return retval;
4cab259f	46	return sprintf(buf, "%d000\n", val);
dac6831e KT	47	}
dac6831e KT	48
ae66d2d9 GR	49	static ssize_t bit_show(struct device dev, struct device_attribute attr,
ae66d2d9 GR	50	char *buf)
dac6831e	51	{
dac6831e	52	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
454aee17	53	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f	54	unsigned int val;
454aee17	55	int retval;
dac6831e	56
4cab259f	57	retval = regmap_read(data->regmap, sda->nr, &val);
dac6831e KT	58	if (retval < 0)
dac6831e KT	59	return retval;
4cab259f	60	return sprintf(buf, "%d\n", !!(val & sda->index));
dac6831e KT	61	}
dac6831e KT	62
ae66d2d9 GR	63	static ssize_t temp_store(struct device dev, struct device_attribute attr,
ae66d2d9 GR	64	const char *buf, size_t count)
dac6831e KT	65	{
dac6831e KT	66	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	67	struct thermal_data *data = dev_get_drvdata(dev);
dac6831e KT	68	unsigned long val;
	69	int retval;
	70
179c4fdb	71	if (kstrtoul(buf, 10, &val))
dac6831e	72	return -EINVAL;
4cab259f GR	73	retval = regmap_write(data->regmap, sda->index,
4cab259f GR	74	DIV_ROUND_CLOSEST(val, 1000));
dac6831e KT	75	if (retval < 0)
	76	return retval;
	77	return count;
	78	}
	79
ae66d2d9 GR	80	static ssize_t bit_store(struct device dev, struct device_attribute attr,
ae66d2d9 GR	81	const char *buf, size_t count)
960f12f4	82	{
960f12f4	83	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
454aee17	84	struct thermal_data *data = dev_get_drvdata(dev);
960f12f4 AC	85	unsigned long val;
	86	int retval;
	87
179c4fdb	88	if (kstrtoul(buf, 10, &val))
960f12f4 AC	89	return -EINVAL;
960f12f4 AC	90
4cab259f GR	91	retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
4cab259f GR	92	val ? sda->index : 0);
960f12f4	93	if (retval < 0)
4cab259f GR	94	return retval;
4cab259f GR	95	return count;
960f12f4 AC	96	}
960f12f4 AC	97
54392ce4 GR	98	static ssize_t show_hyst_common(struct device *dev,
	99	struct device_attribute attr, char buf,
	100	bool is_min)
dac6831e	101	{
dac6831e	102	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	103	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f GR	104	struct regmap *regmap = data->regmap;
	105	unsigned int limit;
	106	unsigned int hyst;
dac6831e	107	int retval;
dac6831e	108
4cab259f	109	retval = regmap_read(regmap, sda->index, &limit);
dac6831e KT	110	if (retval < 0)
	111	return retval;
	112
4cab259f GR	113	retval = regmap_read(regmap, 0x21, &hyst);
	114	if (retval < 0)
	115	return retval;
	116
54392ce4 GR	117	return sprintf(buf, "%d000\n", is_min ? limit + hyst : limit - hyst);
	118	}
	119
ae66d2d9 GR	120	static ssize_t hyst_show(struct device dev, struct device_attribute attr,
ae66d2d9 GR	121	char *buf)
54392ce4 GR	122	{
	123	return show_hyst_common(dev, attr, buf, false);
	124	}
	125
ae66d2d9	126	static ssize_t min_hyst_show(struct device *dev,
54392ce4 GR	127	struct device_attribute attr, char buf)
	128	{
	129	return show_hyst_common(dev, attr, buf, true);
dac6831e KT	130	}
dac6831e KT	131
ae66d2d9 GR	132	static ssize_t hyst_store(struct device dev, struct device_attribute attr,
ae66d2d9 GR	133	const char *buf, size_t count)
dac6831e	134	{
dac6831e	135	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
454aee17	136	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f GR	137	struct regmap *regmap = data->regmap;
4cab259f GR	138	unsigned int limit;
dac6831e KT	139	int retval;
	140	int hyst;
	141	unsigned long val;
	142
179c4fdb	143	if (kstrtoul(buf, 10, &val))
dac6831e KT	144	return -EINVAL;
	145
	146	mutex_lock(&data->mutex);
4cab259f	147	retval = regmap_read(regmap, sda->index, &limit);
dac6831e KT	148	if (retval < 0)
	149	goto fail;
	150
4cab259f	151	hyst = limit * 1000 - val;
ceeaa70c	152	hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
4cab259f GR	153	retval = regmap_write(regmap, 0x21, hyst);
4cab259f GR	154	if (retval == 0)
dac6831e	155	retval = count;
dac6831e KT	156	fail:
	157	mutex_unlock(&data->mutex);
	158	return retval;
	159	}
	160
	161	/*
	162	* Sensors. We pass the actual i2c register to the methods.
	163	*/
	164
ae66d2d9 GR	165	static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 0x06);
	166	static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 0x05);
	167	static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, 0x20);
	168	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0x00);
	169	static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, bit, 0x36, 0x01);
	170	static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, bit, 0x35, 0x01);
	171	static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, bit, 0x37, 0x01);
	172	static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, min_hyst, 0x06);
	173	static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, hyst, 0x05);
	174	static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0x20);
	175
	176	static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, 0x08);
	177	static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 0x07);
	178	static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, 0x19);
	179	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 0x01);
	180	static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, bit, 0x1b, 0x02);
	181	static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, bit, 0x36, 0x02);
	182	static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, bit, 0x35, 0x02);
	183	static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, bit, 0x37, 0x02);
	184	static SENSOR_DEVICE_ATTR_RO(temp2_min_hyst, min_hyst, 0x08);
	185	static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, hyst, 0x07);
	186	static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, hyst, 0x19);
	187
	188	static SENSOR_DEVICE_ATTR_RW(temp3_min, temp, 0x16);
	189	static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 0x15);
	190	static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 0x1A);
	191	static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 0x23);
	192	static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, bit, 0x1b, 0x04);
	193	static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, bit, 0x36, 0x04);
	194	static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, bit, 0x35, 0x04);
	195	static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, bit, 0x37, 0x04);
	196	static SENSOR_DEVICE_ATTR_RO(temp3_min_hyst, min_hyst, 0x16);
	197	static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, hyst, 0x15);
	198	static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, hyst, 0x1A);
	199
	200	static SENSOR_DEVICE_ATTR_RW(temp4_min, temp, 0x2D);
	201	static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 0x2C);
	202	static SENSOR_DEVICE_ATTR_RW(temp4_crit, temp, 0x30);
	203	static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 0x2A);
	204	static SENSOR_DEVICE_ATTR_2_RO(temp4_fault, bit, 0x1b, 0x08);
	205	static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, bit, 0x36, 0x08);
	206	static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, bit, 0x35, 0x08);
	207	static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, bit, 0x37, 0x08);
	208	static SENSOR_DEVICE_ATTR_RO(temp4_min_hyst, min_hyst, 0x2D);
	209	static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, hyst, 0x2C);
	210	static SENSOR_DEVICE_ATTR_RO(temp4_crit_hyst, hyst, 0x30);
	211
	212	static SENSOR_DEVICE_ATTR_2_RW(power_state, bit, 0x03, 0x40);
960f12f4	213
be7f5c4d	214	static struct attribute *emc1402_attrs[] = {
dac6831e KT	215	&sensor_dev_attr_temp1_min.dev_attr.attr,
	216	&sensor_dev_attr_temp1_max.dev_attr.attr,
	217	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	218	&sensor_dev_attr_temp1_input.dev_attr.attr,
54392ce4	219	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
a9a74006	220	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
dac6831e	221	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
be7f5c4d	222
dac6831e KT	223	&sensor_dev_attr_temp2_min.dev_attr.attr,
	224	&sensor_dev_attr_temp2_max.dev_attr.attr,
	225	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	226	&sensor_dev_attr_temp2_input.dev_attr.attr,
54392ce4	227	&sensor_dev_attr_temp2_min_hyst.dev_attr.attr,
a9a74006	228	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
be7f5c4d JG	229	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	230
	231	&sensor_dev_attr_power_state.dev_attr.attr,
	232	NULL
	233	};
	234
	235	static const struct attribute_group emc1402_group = {
	236	.attrs = emc1402_attrs,
	237	};
	238
	239	static struct attribute *emc1403_attrs[] = {
	240	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	241	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	242	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	243
d8850c19	244	&sensor_dev_attr_temp2_fault.dev_attr.attr,
dac6831e KT	245	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	246	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	247	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
be7f5c4d	248
dac6831e KT	249	&sensor_dev_attr_temp3_min.dev_attr.attr,
	250	&sensor_dev_attr_temp3_max.dev_attr.attr,
	251	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	252	&sensor_dev_attr_temp3_input.dev_attr.attr,
d8850c19	253	&sensor_dev_attr_temp3_fault.dev_attr.attr,
dac6831e KT	254	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	255	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	256	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
54392ce4	257	&sensor_dev_attr_temp3_min_hyst.dev_attr.attr,
a9a74006	258	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
dac6831e KT	259	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
	260	NULL
	261	};
0011ddfe GR	262
	263	static const struct attribute_group emc1403_group = {
	264	.attrs = emc1403_attrs,
	265	};
	266
	267	static struct attribute *emc1404_attrs[] = {
	268	&sensor_dev_attr_temp4_min.dev_attr.attr,
	269	&sensor_dev_attr_temp4_max.dev_attr.attr,
	270	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	271	&sensor_dev_attr_temp4_input.dev_attr.attr,
d8850c19	272	&sensor_dev_attr_temp4_fault.dev_attr.attr,
0011ddfe GR	273	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	274	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	275	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
54392ce4	276	&sensor_dev_attr_temp4_min_hyst.dev_attr.attr,
a9a74006	277	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
0011ddfe GR	278	&sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
	279	NULL
	280	};
	281
	282	static const struct attribute_group emc1404_group = {
	283	.attrs = emc1404_attrs,
	284	};
dac6831e	285
03f49f64 GR	286	/*
	287	* EMC14x2 uses a different register and different bits to report alarm and
	288	* fault status. For simplicity, provide a separate attribute group for this
	289	* chip series.
	290	* Since we can not re-use the same attribute names, create a separate attribute
	291	* array.
	292	*/
	293	static struct sensor_device_attribute_2 emc1402_alarms[] = {
ae66d2d9 GR	294	SENSOR_ATTR_2_RO(temp1_min_alarm, bit, 0x02, 0x20),
	295	SENSOR_ATTR_2_RO(temp1_max_alarm, bit, 0x02, 0x40),
	296	SENSOR_ATTR_2_RO(temp1_crit_alarm, bit, 0x02, 0x01),
	297
	298	SENSOR_ATTR_2_RO(temp2_fault, bit, 0x02, 0x04),
	299	SENSOR_ATTR_2_RO(temp2_min_alarm, bit, 0x02, 0x08),
	300	SENSOR_ATTR_2_RO(temp2_max_alarm, bit, 0x02, 0x10),
	301	SENSOR_ATTR_2_RO(temp2_crit_alarm, bit, 0x02, 0x02),
03f49f64 GR	302	};
	303
	304	static struct attribute *emc1402_alarm_attrs[] = {
	305	&emc1402_alarms[0].dev_attr.attr,
	306	&emc1402_alarms[1].dev_attr.attr,
	307	&emc1402_alarms[2].dev_attr.attr,
	308	&emc1402_alarms[3].dev_attr.attr,
	309	&emc1402_alarms[4].dev_attr.attr,
	310	&emc1402_alarms[5].dev_attr.attr,
	311	&emc1402_alarms[6].dev_attr.attr,
	312	NULL,
	313	};
	314
	315	static const struct attribute_group emc1402_alarm_group = {
	316	.attrs = emc1402_alarm_attrs,
	317	};
	318
dac6831e KT	319	static int emc1403_detect(struct i2c_client *client,
	320	struct i2c_board_info *info)
	321	{
	322	int id;
7a1b76f2	323	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
dac6831e KT	324
	325	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	326	if (id != 0x5d)
	327	return -ENODEV;
	328
7a1b76f2 JL	329	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
7a1b76f2 JL	330	switch (id) {
be7f5c4d	331	case 0x20:
f2f394db	332	strscpy(info->type, "emc1402", I2C_NAME_SIZE);
be7f5c4d	333	break;
7a1b76f2	334	case 0x21:
f2f394db	335	strscpy(info->type, "emc1403", I2C_NAME_SIZE);
7a1b76f2	336	break;
be7f5c4d	337	case 0x22:
f2f394db	338	strscpy(info->type, "emc1422", I2C_NAME_SIZE);
be7f5c4d	339	break;
7a1b76f2	340	case 0x23:
f2f394db	341	strscpy(info->type, "emc1423", I2C_NAME_SIZE);
7a1b76f2	342	break;
0011ddfe	343	case 0x25:
f2f394db	344	strscpy(info->type, "emc1404", I2C_NAME_SIZE);
0011ddfe GR	345	break;
0011ddfe GR	346	case 0x27:
f2f394db	347	strscpy(info->type, "emc1424", I2C_NAME_SIZE);
0011ddfe	348	break;
7a1b76f2	349	default:
dac6831e	350	return -ENODEV;
7a1b76f2	351	}
dac6831e KT	352
dac6831e KT	353	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
3a18e139	354	if (id < 0x01 \|\| id > 0x04)
dac6831e KT	355	return -ENODEV;
dac6831e KT	356
dac6831e KT	357	return 0;
	358	}
	359
4cab259f GR	360	static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
	361	{
	362	switch (reg) {
	363	case 0x00: /* internal diode high byte */
	364	case 0x01: /* external diode 1 high byte */
	365	case 0x02: /* status */
	366	case 0x10: /* external diode 1 low byte */
	367	case 0x1b: /* external diode fault */
	368	case 0x23: /* external diode 2 high byte */
	369	case 0x24: /* external diode 2 low byte */
	370	case 0x29: /* internal diode low byte */
	371	case 0x2a: /* externl diode 3 high byte */
	372	case 0x2b: /* external diode 3 low byte */
	373	case 0x35: /* high limit status */
	374	case 0x36: /* low limit status */
	375	case 0x37: /* therm limit status */
	376	return true;
	377	default:
	378	return false;
	379	}
	380	}
	381
034b44b4	382	static const struct regmap_config emc1403_regmap_config = {
4cab259f GR	383	.reg_bits = 8,
	384	.val_bits = 8,
	385	.cache_type = REGCACHE_RBTREE,
	386	.volatile_reg = emc1403_regmap_is_volatile,
	387	};
	388
67487038 SK	389	static const struct i2c_device_id emc1403_idtable[];
	390
	391	static int emc1403_probe(struct i2c_client *client)
dac6831e	392	{
dac6831e	393	struct thermal_data *data;
454aee17	394	struct device *hwmon_dev;
67487038	395	const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
dac6831e	396
7b52eefe GR	397	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
	398	GFP_KERNEL);
	399	if (data == NULL)
dac6831e	400	return -ENOMEM;
dac6831e	401
4cab259f GR	402	data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
	403	if (IS_ERR(data->regmap))
	404	return PTR_ERR(data->regmap);
	405
dac6831e	406	mutex_init(&data->mutex);
dac6831e	407
be7f5c4d JG	408	switch (id->driver_data) {
	409	case emc1404:
	410	data->groups[2] = &emc1404_group;
df561f66	411	fallthrough;
be7f5c4d JG	412	case emc1403:
be7f5c4d JG	413	data->groups[1] = &emc1403_group;
df561f66	414	fallthrough;
be7f5c4d JG	415	case emc1402:
	416	data->groups[0] = &emc1402_group;
	417	}
0011ddfe	418
03f49f64 GR	419	if (id->driver_data == emc1402)
	420	data->groups[1] = &emc1402_alarm_group;
	421
8759f904 JD	422	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
	423	client->name, data,
	424	data->groups);
454aee17 GR	425	if (IS_ERR(hwmon_dev))
454aee17 GR	426	return PTR_ERR(hwmon_dev);
dac6831e	427
0011ddfe	428	dev_info(&client->dev, "%s Thermal chip found\n", id->name);
dac6831e KT	429	return 0;
	430	}
	431
	432	static const unsigned short emc1403_address_list[] = {
be7f5c4d	433	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
dac6831e KT	434	};
dac6831e KT	435
be7f5c4d	436	/* Last digit of chip name indicates number of channels */
dac6831e	437	static const struct i2c_device_id emc1403_idtable[] = {
be7f5c4d JG	438	{ "emc1402", emc1402 },
	439	{ "emc1403", emc1403 },
	440	{ "emc1404", emc1404 },
51585bef GR	441	{ "emc1412", emc1402 },
	442	{ "emc1413", emc1403 },
	443	{ "emc1414", emc1404 },
be7f5c4d JG	444	{ "emc1422", emc1402 },
	445	{ "emc1423", emc1403 },
	446	{ "emc1424", emc1404 },
dac6831e KT	447	{ }
	448	};
	449	MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
	450
	451	static struct i2c_driver sensor_emc1403 = {
	452	.class = I2C_CLASS_HWMON,
	453	.driver = {
	454	.name = "emc1403",
	455	},
	456	.detect = emc1403_detect,
67487038	457	.probe_new = emc1403_probe,
dac6831e KT	458	.id_table = emc1403_idtable,
	459	.address_list = emc1403_address_list,
	460	};
	461
f0967eea	462	module_i2c_driver(sensor_emc1403);
dac6831e KT	463
	464	MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
	465	MODULE_DESCRIPTION("emc1403 Thermal Driver");
	466	MODULE_LICENSE("GPL v2");