[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>
#include <linux/util_macros.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 {
	enum emc1403_chip chip;
	struct regmap *regmap;
	struct mutex mutex;
};

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

	retval = regmap_read(data->regmap, 0x03, &val);
	if (retval < 0)
		return retval;
	return sprintf(buf, "%d\n", !!(val & BIT(6)));
}

static ssize_t power_state_store(struct device *dev, struct device_attribute *attr,
				 const char *buf, size_t count)
{
	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, 0x03, BIT(6),
				    val ? BIT(6) : 0);
	if (retval < 0)
		return retval;
	return count;
}

static DEVICE_ATTR_RW(power_state);

static struct attribute *emc1403_attrs[] = {
	&dev_attr_power_state.attr,
	NULL
};
ATTRIBUTE_GROUPS(emc1403);

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;
	case 0x60:
		strscpy(info->type, "emc1442", 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_MAPLE,
	.volatile_reg = emc1403_regmap_is_volatile,
};

enum emc1403_reg_map {temp_min, temp_max, temp_crit, temp_input};

static u8 ema1403_temp_map[] = {
	[hwmon_temp_min] = temp_min,
	[hwmon_temp_max] = temp_max,
	[hwmon_temp_crit] = temp_crit,
	[hwmon_temp_input] = temp_input,
};

static u8 emc1403_temp_regs[][4] = {
	[0] = {
		[temp_min] = 0x06,
		[temp_max] = 0x05,
		[temp_crit] = 0x20,
		[temp_input] = 0x00,
	},
	[1] = {
		[temp_min] = 0x08,
		[temp_max] = 0x07,
		[temp_crit] = 0x19,
		[temp_input] = 0x01,
	},
	[2] = {
		[temp_min] = 0x16,
		[temp_max] = 0x15,
		[temp_crit] = 0x1a,
		[temp_input] = 0x23,
	},
	[3] = {
		[temp_min] = 0x2d,
		[temp_max] = 0x2c,
		[temp_crit] = 0x30,
		[temp_input] = 0x2a,
	},
};

static s8 emc1403_temp_regs_low[][4] = {
	[0] = {
		[temp_min] = -1,
		[temp_max] = -1,
		[temp_crit] = -1,
		[temp_input] = 0x29,
	},
	[1] = {
		[temp_min] = 0x14,
		[temp_max] = 0x13,
		[temp_crit] = -1,
		[temp_input] = 0x10,
	},
	[2] = {
		[temp_min] = 0x18,
		[temp_max] = 0x17,
		[temp_crit] = -1,
		[temp_input] = 0x24,
	},
	[3] = {
		[temp_min] = 0x2f,
		[temp_max] = 0x2e,
		[temp_crit] = -1,
		[temp_input] = 0x2b,
	},
};

static int __emc1403_get_temp(struct thermal_data *data, int channel,
			      enum emc1403_reg_map map, long *val)
{
	unsigned int regval;
	int ret;
	s8 reg;

	ret = regmap_read(data->regmap, emc1403_temp_regs[channel][map], &regval);
	if (ret < 0)
		return ret;
	*val = regval * 1000;

	reg = emc1403_temp_regs_low[channel][map];
	if (reg >= 0) {
		ret = regmap_read(data->regmap, reg, &regval);
		if (ret < 0)
			return ret;
		*val += (regval >> 5) * 125;
	}
	return 0;
}

static int emc1403_get_temp(struct thermal_data *data, int channel,
			    enum emc1403_reg_map map, long *val)
{
	int ret;

	mutex_lock(&data->mutex);
	ret = __emc1403_get_temp(data, channel, map, val);
	mutex_unlock(&data->mutex);

	return ret;
}

static int emc1403_get_hyst(struct thermal_data *data, int channel,
			    enum emc1403_reg_map map, long *val)
{
	int hyst, ret;
	long limit;

	mutex_lock(&data->mutex);
	ret = __emc1403_get_temp(data, channel, map, &limit);
	if (ret < 0)
		goto unlock;
	ret = regmap_read(data->regmap, 0x21, &hyst);
	if (ret < 0)
		goto unlock;
	if (map == temp_min)
		*val = limit + hyst * 1000;
	else
		*val = limit - hyst * 1000;
unlock:
	mutex_unlock(&data->mutex);
	return ret;
}

static int emc1403_temp_read(struct thermal_data *data, u32 attr, int channel, long *val)
{
	unsigned int regval;
	int ret;

	switch (attr) {
	case hwmon_temp_min:
	case hwmon_temp_max:
	case hwmon_temp_crit:
	case hwmon_temp_input:
		ret = emc1403_get_temp(data, channel, ema1403_temp_map[attr], val);
		break;
	case hwmon_temp_min_hyst:
		ret = emc1403_get_hyst(data, channel, temp_min, val);
		break;
	case hwmon_temp_max_hyst:
		ret = emc1403_get_hyst(data, channel, temp_max, val);
		break;
	case hwmon_temp_crit_hyst:
		ret = emc1403_get_hyst(data, channel, temp_crit, val);
		break;
	case hwmon_temp_min_alarm:
		if (data->chip == emc1402) {
			ret = regmap_read(data->regmap, 0x02, &regval);
			if (ret < 0)
				break;
			*val = !!(regval & BIT(5 - 2 * channel));
		} else {
			ret = regmap_read(data->regmap, 0x36, &regval);
			if (ret < 0)
				break;
			*val = !!(regval & BIT(channel));
		}
		break;
	case hwmon_temp_max_alarm:
		if (data->chip == emc1402) {
			ret = regmap_read(data->regmap, 0x02, &regval);
			if (ret < 0)
				break;
			*val = !!(regval & BIT(6 - 2 * channel));
		} else {
			ret = regmap_read(data->regmap, 0x35, &regval);
			if (ret < 0)
				break;
			*val = !!(regval & BIT(channel));
		}
		break;
	case hwmon_temp_crit_alarm:
		if (data->chip == emc1402) {
			ret = regmap_read(data->regmap, 0x02, &regval);
			if (ret < 0)
				break;
			*val = !!(regval & BIT(channel));
		} else {
			ret = regmap_read(data->regmap, 0x37, &regval);
			if (ret < 0)
				break;
			*val = !!(regval & BIT(channel));
		}
		break;
	case hwmon_temp_fault:
		ret = regmap_read(data->regmap, 0x1b, &regval);
		if (ret < 0)
			break;
		*val = !!(regval & BIT(channel));
		break;
	default:
		return -EOPNOTSUPP;
	}
	return ret;
}

static int emc1403_get_convrate(struct thermal_data *data, long *val)
{
	unsigned int convrate;
	int ret;

	ret = regmap_read(data->regmap, 0x04, &convrate);
	if (ret < 0)
		return ret;
	if (convrate > 10)
		convrate = 4;

	*val = 16000 >> convrate;
	return 0;
}

static int emc1403_chip_read(struct thermal_data *data, u32 attr, long *val)
{
	switch (attr) {
	case hwmon_chip_update_interval:
		return emc1403_get_convrate(data, val);
	default:
		return -EOPNOTSUPP;
	}
}

static int emc1403_read(struct device *dev, enum hwmon_sensor_types type,
			u32 attr, int channel, long *val)
{
	struct thermal_data *data = dev_get_drvdata(dev);

	switch (type) {
	case hwmon_temp:
		return emc1403_temp_read(data, attr, channel, val);
	case hwmon_chip:
		return emc1403_chip_read(data, attr, val);
	default:
		return -EOPNOTSUPP;
	}
}

static int emc1403_set_hyst(struct thermal_data *data, long val)
{
	int hyst, ret;
	long limit;

	val = clamp_val(val, 0, 255000);

	mutex_lock(&data->mutex);
	ret = __emc1403_get_temp(data, 0, temp_crit, &limit);
	if (ret < 0)
		goto unlock;

	hyst = limit - val;
	hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
	ret = regmap_write(data->regmap, 0x21, hyst);
unlock:
	mutex_unlock(&data->mutex);
	return ret;
}

static int emc1403_set_temp(struct thermal_data *data, int channel,
			    enum emc1403_reg_map map, long val)
{
	unsigned int regval;
	int ret;
	u8 regh;
	s8 regl;

	regh = emc1403_temp_regs[channel][map];
	regl = emc1403_temp_regs_low[channel][map];

	mutex_lock(&data->mutex);
	if (regl >= 0) {
		val = clamp_val(val, 0, 255875);
		regval = DIV_ROUND_CLOSEST(val, 125);
		ret = regmap_write(data->regmap, regh, regval >> 3);
		if (ret < 0)
			goto unlock;
		ret = regmap_write(data->regmap, regl, (regval & 0x07) << 5);
	} else {
		val = clamp_val(val, 0, 255000);
		regval = DIV_ROUND_CLOSEST(val, 1000);
		ret = regmap_write(data->regmap, regh, regval);
	}
unlock:
	mutex_unlock(&data->mutex);
	return ret;
}

static int emc1403_temp_write(struct thermal_data *data, u32 attr, int channel, long val)
{
	switch (attr) {
	case hwmon_temp_min:
	case hwmon_temp_max:
	case hwmon_temp_crit:
		return emc1403_set_temp(data, channel, ema1403_temp_map[attr], val);
	case hwmon_temp_crit_hyst:
		return emc1403_set_hyst(data, val);
	default:
		return -EOPNOTSUPP;
	}
}

/* Lookup table for temperature conversion times in msec */
static const u16 ina3221_conv_time[] = {
	16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62, 31, 16
};

static int emc1403_set_convrate(struct thermal_data *data, unsigned int interval)
{
	int convrate;

	convrate = find_closest_descending(interval, ina3221_conv_time,
					   ARRAY_SIZE(ina3221_conv_time));
	return regmap_write(data->regmap, 0x04, convrate);
}

static int emc1403_chip_write(struct thermal_data *data, u32 attr, long val)
{
	switch (attr) {
	case hwmon_chip_update_interval:
		return emc1403_set_convrate(data, clamp_val(val, 0, 100000));
	default:
		return -EOPNOTSUPP;
	}
}

static int emc1403_write(struct device *dev, enum hwmon_sensor_types type,
			 u32 attr, int channel, long val)
{
	struct thermal_data *data = dev_get_drvdata(dev);

	switch (type) {
	case hwmon_temp:
		return emc1403_temp_write(data, attr, channel, val);
	case hwmon_chip:
		return emc1403_chip_write(data, attr, val);
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t emc1403_temp_is_visible(const void *_data, u32 attr, int channel)
{
	const struct thermal_data *data = _data;

	if (data->chip == emc1402 && channel > 1)
		return 0;
	if (data->chip == emc1403 && channel > 2)
		return 0;

	switch (attr) {
	case hwmon_temp_input:
	case hwmon_temp_min_alarm:
	case hwmon_temp_max_alarm:
	case hwmon_temp_crit_alarm:
	case hwmon_temp_fault:
	case hwmon_temp_min_hyst:
	case hwmon_temp_max_hyst:
		return 0444;
	case hwmon_temp_min:
	case hwmon_temp_max:
	case hwmon_temp_crit:
		return 0644;
	case hwmon_temp_crit_hyst:
		if (channel == 0)
			return 0644;
		return 0444;
	default:
		return 0;
	}
}

static umode_t emc1403_chip_is_visible(const void *_data, u32 attr)
{
	switch (attr) {
	case hwmon_chip_update_interval:
		return 0644;
	default:
		return 0;
	}
}

static umode_t emc1403_is_visible(const void *data, enum hwmon_sensor_types type,
				  u32 attr, int channel)
{
	switch (type) {
	case hwmon_temp:
		return emc1403_temp_is_visible(data, attr, channel);
	case hwmon_chip:
		return emc1403_chip_is_visible(data, attr);
	default:
		return 0;
	}
}

static const struct hwmon_channel_info * const emc1403_info[] = {
	HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),
	HWMON_CHANNEL_INFO(temp,
			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
			   HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
			   HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
			   HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
			   HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
			   HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
			   HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
			   HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
			   HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT
			   ),
	NULL
};

static const struct hwmon_ops emc1403_hwmon_ops = {
	.is_visible = emc1403_is_visible,
	.read = emc1403_read,
	.write = emc1403_write,
};

static const struct hwmon_chip_info emc1403_chip_info = {
	.ops = &emc1403_hwmon_ops,
	.info = emc1403_info,
};

/* 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 },
	{ "emc1442", emc1402 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, 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)
		return -ENOMEM;

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

	mutex_init(&data->mutex);

	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
							 client->name, data,
							 &emc1403_chip_info,
							 emc1403_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const unsigned short emc1403_address_list[] = {
	0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
};

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
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>
6a815781	22	#include <linux/util_macros.h>
dac6831e KT	23
	24	#define THERMAL_PID_REG 0xfd
	25	#define THERMAL_SMSC_ID_REG 0xfe
	26	#define THERMAL_REVISION_REG 0xff
	27
be7f5c4d JG	28	enum emc1403_chip { emc1402, emc1403, emc1404 };
be7f5c4d JG	29
dac6831e	30	struct thermal_data {
1094360d	31	enum emc1403_chip chip;
4cab259f	32	struct regmap *regmap;
dac6831e	33	struct mutex mutex;
dac6831e KT	34	};
dac6831e KT	35
1094360d	36	static ssize_t power_state_show(struct device dev, struct device_attribute attr, char *buf)
dac6831e	37	{
454aee17	38	struct thermal_data *data = dev_get_drvdata(dev);
4cab259f	39	unsigned int val;
454aee17	40	int retval;
dac6831e	41
1094360d	42	retval = regmap_read(data->regmap, 0x03, &val);
dac6831e KT	43	if (retval < 0)
dac6831e KT	44	return retval;
1094360d	45	return sprintf(buf, "%d\n", !!(val & BIT(6)));
dac6831e KT	46	}
dac6831e KT	47
1094360d GR	48	static ssize_t power_state_store(struct device dev, struct device_attribute attr,
1094360d GR	49	const char *buf, size_t count)
dac6831e	50	{
454aee17	51	struct thermal_data *data = dev_get_drvdata(dev);
960f12f4 AC	52	unsigned long val;
	53	int retval;
	54
179c4fdb	55	if (kstrtoul(buf, 10, &val))
960f12f4 AC	56	return -EINVAL;
960f12f4 AC	57
1094360d GR	58	retval = regmap_update_bits(data->regmap, 0x03, BIT(6),
1094360d GR	59	val ? BIT(6) : 0);
960f12f4	60	if (retval < 0)
4cab259f GR	61	return retval;
4cab259f GR	62	return count;
960f12f4 AC	63	}
960f12f4 AC	64
1094360d	65	static DEVICE_ATTR_RW(power_state);
be7f5c4d JG	66
be7f5c4d JG	67	static struct attribute *emc1403_attrs[] = {
1094360d	68	&dev_attr_power_state.attr,
0011ddfe GR	69	NULL
0011ddfe GR	70	};
1094360d	71	ATTRIBUTE_GROUPS(emc1403);
03f49f64	72
dac6831e KT	73	static int emc1403_detect(struct i2c_client *client,
	74	struct i2c_board_info *info)
	75	{
	76	int id;
7a1b76f2	77	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
dac6831e KT	78
	79	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	80	if (id != 0x5d)
	81	return -ENODEV;
	82
7a1b76f2 JL	83	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
7a1b76f2 JL	84	switch (id) {
be7f5c4d	85	case 0x20:
f2f394db	86	strscpy(info->type, "emc1402", I2C_NAME_SIZE);
be7f5c4d	87	break;
7a1b76f2	88	case 0x21:
f2f394db	89	strscpy(info->type, "emc1403", I2C_NAME_SIZE);
7a1b76f2	90	break;
be7f5c4d	91	case 0x22:
f2f394db	92	strscpy(info->type, "emc1422", I2C_NAME_SIZE);
be7f5c4d	93	break;
7a1b76f2	94	case 0x23:
f2f394db	95	strscpy(info->type, "emc1423", I2C_NAME_SIZE);
7a1b76f2	96	break;
0011ddfe	97	case 0x25:
f2f394db	98	strscpy(info->type, "emc1404", I2C_NAME_SIZE);
0011ddfe GR	99	break;
0011ddfe GR	100	case 0x27:
f2f394db	101	strscpy(info->type, "emc1424", I2C_NAME_SIZE);
0011ddfe	102	break;
9350163a DCC	103	case 0x60:
	104	strscpy(info->type, "emc1442", I2C_NAME_SIZE);
	105	break;
7a1b76f2	106	default:
dac6831e	107	return -ENODEV;
7a1b76f2	108	}
dac6831e KT	109
dac6831e KT	110	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
3a18e139	111	if (id < 0x01 \|\| id > 0x04)
dac6831e KT	112	return -ENODEV;
dac6831e KT	113
dac6831e KT	114	return 0;
	115	}
	116
4cab259f GR	117	static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
	118	{
	119	switch (reg) {
	120	case 0x00: /* internal diode high byte */
	121	case 0x01: /* external diode 1 high byte */
	122	case 0x02: /* status */
	123	case 0x10: /* external diode 1 low byte */
	124	case 0x1b: /* external diode fault */
	125	case 0x23: /* external diode 2 high byte */
	126	case 0x24: /* external diode 2 low byte */
	127	case 0x29: /* internal diode low byte */
	128	case 0x2a: /* externl diode 3 high byte */
	129	case 0x2b: /* external diode 3 low byte */
	130	case 0x35: /* high limit status */
	131	case 0x36: /* low limit status */
	132	case 0x37: /* therm limit status */
	133	return true;
	134	default:
	135	return false;
	136	}
	137	}
	138
034b44b4	139	static const struct regmap_config emc1403_regmap_config = {
4cab259f GR	140	.reg_bits = 8,
4cab259f GR	141	.val_bits = 8,
9c440cf0	142	.cache_type = REGCACHE_MAPLE,
4cab259f GR	143	.volatile_reg = emc1403_regmap_is_volatile,
	144	};
	145
1094360d	146	enum emc1403_reg_map {temp_min, temp_max, temp_crit, temp_input};
67487038	147
1094360d GR	148	static u8 ema1403_temp_map[] = {
	149	[hwmon_temp_min] = temp_min,
	150	[hwmon_temp_max] = temp_max,
	151	[hwmon_temp_crit] = temp_crit,
	152	[hwmon_temp_input] = temp_input,
	153	};
	154
	155	static u8 emc1403_temp_regs[][4] = {
	156	[0] = {
	157	[temp_min] = 0x06,
	158	[temp_max] = 0x05,
	159	[temp_crit] = 0x20,
	160	[temp_input] = 0x00,
	161	},
	162	[1] = {
	163	[temp_min] = 0x08,
	164	[temp_max] = 0x07,
	165	[temp_crit] = 0x19,
	166	[temp_input] = 0x01,
	167	},
	168	[2] = {
	169	[temp_min] = 0x16,
	170	[temp_max] = 0x15,
	171	[temp_crit] = 0x1a,
	172	[temp_input] = 0x23,
	173	},
	174	[3] = {
	175	[temp_min] = 0x2d,
	176	[temp_max] = 0x2c,
	177	[temp_crit] = 0x30,
	178	[temp_input] = 0x2a,
	179	},
	180	};
	181
e77b204a GR	182	static s8 emc1403_temp_regs_low[][4] = {
	183	[0] = {
	184	[temp_min] = -1,
	185	[temp_max] = -1,
	186	[temp_crit] = -1,
	187	[temp_input] = 0x29,
	188	},
	189	[1] = {
	190	[temp_min] = 0x14,
	191	[temp_max] = 0x13,
	192	[temp_crit] = -1,
	193	[temp_input] = 0x10,
	194	},
	195	[2] = {
	196	[temp_min] = 0x18,
	197	[temp_max] = 0x17,
	198	[temp_crit] = -1,
	199	[temp_input] = 0x24,
	200	},
	201	[3] = {
	202	[temp_min] = 0x2f,
	203	[temp_max] = 0x2e,
	204	[temp_crit] = -1,
	205	[temp_input] = 0x2b,
	206	},
	207	};
	208
1094360d GR	209	static int __emc1403_get_temp(struct thermal_data *data, int channel,
1094360d GR	210	enum emc1403_reg_map map, long *val)
dac6831e	211	{
1094360d GR	212	unsigned int regval;
1094360d GR	213	int ret;
e77b204a	214	s8 reg;
dac6831e	215
1094360d GR	216	ret = regmap_read(data->regmap, emc1403_temp_regs[channel][map], &regval);
	217	if (ret < 0)
	218	return ret;
	219	val = regval 1000;
dac6831e	220
e77b204a GR	221	reg = emc1403_temp_regs_low[channel][map];
	222	if (reg >= 0) {
	223	ret = regmap_read(data->regmap, reg, &regval);
	224	if (ret < 0)
	225	return ret;
	226	val += (regval >> 5) 125;
	227	}
1094360d GR	228	return 0;
1094360d GR	229	}
4cab259f	230
1094360d GR	231	static int emc1403_get_temp(struct thermal_data *data, int channel,
	232	enum emc1403_reg_map map, long *val)
	233	{
	234	int ret;
	235
	236	mutex_lock(&data->mutex);
	237	ret = __emc1403_get_temp(data, channel, map, val);
	238	mutex_unlock(&data->mutex);
	239
	240	return ret;
	241	}
	242
	243	static int emc1403_get_hyst(struct thermal_data *data, int channel,
	244	enum emc1403_reg_map map, long *val)
	245	{
	246	int hyst, ret;
	247	long limit;
	248
	249	mutex_lock(&data->mutex);
	250	ret = __emc1403_get_temp(data, channel, map, &limit);
	251	if (ret < 0)
	252	goto unlock;
	253	ret = regmap_read(data->regmap, 0x21, &hyst);
	254	if (ret < 0)
	255	goto unlock;
	256	if (map == temp_min)
	257	val = limit + hyst 1000;
	258	else
	259	val = limit - hyst 1000;
	260	unlock:
	261	mutex_unlock(&data->mutex);
	262	return ret;
	263	}
	264
	265	static int emc1403_temp_read(struct thermal_data data, u32 attr, int channel, long val)
	266	{
	267	unsigned int regval;
	268	int ret;
	269
	270	switch (attr) {
	271	case hwmon_temp_min:
	272	case hwmon_temp_max:
	273	case hwmon_temp_crit:
	274	case hwmon_temp_input:
	275	ret = emc1403_get_temp(data, channel, ema1403_temp_map[attr], val);
	276	break;
	277	case hwmon_temp_min_hyst:
	278	ret = emc1403_get_hyst(data, channel, temp_min, val);
	279	break;
	280	case hwmon_temp_max_hyst:
	281	ret = emc1403_get_hyst(data, channel, temp_max, val);
	282	break;
	283	case hwmon_temp_crit_hyst:
	284	ret = emc1403_get_hyst(data, channel, temp_crit, val);
	285	break;
	286	case hwmon_temp_min_alarm:
	287	if (data->chip == emc1402) {
	288	ret = regmap_read(data->regmap, 0x02, &regval);
	289	if (ret < 0)
	290	break;
	291	val = !!(regval & BIT(5 - 2 channel));
	292	} else {
	293	ret = regmap_read(data->regmap, 0x36, &regval);
	294	if (ret < 0)
295	break;
296	*val = !!(regval & BIT(channel));
297	}
298	break;
299	case hwmon_temp_max_alarm:
300	if (data->chip == emc1402) {
301	ret = regmap_read(data->regmap, 0x02, &regval);
302	if (ret < 0)
303	break;
304	val = !!(regval & BIT(6 - 2 channel));
305	} else {
306	ret = regmap_read(data->regmap, 0x35, &regval);
307	if (ret < 0)
308	break;
309	*val = !!(regval & BIT(channel));
310	}
311	break;
312	case hwmon_temp_crit_alarm:
313	if (data->chip == emc1402) {
314	ret = regmap_read(data->regmap, 0x02, &regval);
315	if (ret < 0)
316	break;
317	*val = !!(regval & BIT(channel));
318	} else {
319	ret = regmap_read(data->regmap, 0x37, &regval);
320	if (ret < 0)
321	break;
322	*val = !!(regval & BIT(channel));
323	}
324	break;
325	case hwmon_temp_fault:
326	ret = regmap_read(data->regmap, 0x1b, &regval);
327	if (ret < 0)
328	break;
329	*val = !!(regval & BIT(channel));
330	break;
331	default:
332	return -EOPNOTSUPP;
333	}
334	return ret;
335	}
336
6a815781 GR	337	static int emc1403_get_convrate(struct thermal_data data, long val)
	338	{
	339	unsigned int convrate;
	340	int ret;
	341
	342	ret = regmap_read(data->regmap, 0x04, &convrate);
	343	if (ret < 0)
	344	return ret;
	345	if (convrate > 10)
	346	convrate = 4;
	347
	348	*val = 16000 >> convrate;
	349	return 0;
	350	}
	351
	352	static int emc1403_chip_read(struct thermal_data data, u32 attr, long val)
	353	{
	354	switch (attr) {
	355	case hwmon_chip_update_interval:
	356	return emc1403_get_convrate(data, val);
	357	default:
	358	return -EOPNOTSUPP;
	359	}
	360	}
	361
1094360d GR	362	static int emc1403_read(struct device *dev, enum hwmon_sensor_types type,
	363	u32 attr, int channel, long *val)
	364	{
	365	struct thermal_data *data = dev_get_drvdata(dev);
dac6831e	366
1094360d GR	367	switch (type) {
	368	case hwmon_temp:
	369	return emc1403_temp_read(data, attr, channel, val);
6a815781 GR	370	case hwmon_chip:
6a815781 GR	371	return emc1403_chip_read(data, attr, val);
1094360d GR	372	default:
1094360d GR	373	return -EOPNOTSUPP;
be7f5c4d	374	}
1094360d	375	}
0011ddfe	376
1094360d GR	377	static int emc1403_set_hyst(struct thermal_data *data, long val)
	378	{
	379	int hyst, ret;
	380	long limit;
03f49f64	381
1094360d	382	val = clamp_val(val, 0, 255000);
dac6831e	383
1094360d GR	384	mutex_lock(&data->mutex);
	385	ret = __emc1403_get_temp(data, 0, temp_crit, &limit);
	386	if (ret < 0)
	387	goto unlock;
	388
	389	hyst = limit - val;
	390	hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
	391	ret = regmap_write(data->regmap, 0x21, hyst);
	392	unlock:
	393	mutex_unlock(&data->mutex);
	394	return ret;
dac6831e KT	395	}
dac6831e KT	396
1094360d GR	397	static int emc1403_set_temp(struct thermal_data *data, int channel,
	398	enum emc1403_reg_map map, long val)
	399	{
	400	unsigned int regval;
	401	int ret;
e77b204a GR	402	u8 regh;
e77b204a GR	403	s8 regl;
1094360d	404
e77b204a GR	405	regh = emc1403_temp_regs[channel][map];
e77b204a GR	406	regl = emc1403_temp_regs_low[channel][map];
1094360d GR	407
1094360d GR	408	mutex_lock(&data->mutex);
e77b204a GR	409	if (regl >= 0) {
	410	val = clamp_val(val, 0, 255875);
	411	regval = DIV_ROUND_CLOSEST(val, 125);
	412	ret = regmap_write(data->regmap, regh, regval >> 3);
	413	if (ret < 0)
	414	goto unlock;
	415	ret = regmap_write(data->regmap, regl, (regval & 0x07) << 5);
	416	} else {
	417	val = clamp_val(val, 0, 255000);
	418	regval = DIV_ROUND_CLOSEST(val, 1000);
	419	ret = regmap_write(data->regmap, regh, regval);
	420	}
	421	unlock:
1094360d GR	422	mutex_unlock(&data->mutex);
	423	return ret;
	424	}
	425
	426	static int emc1403_temp_write(struct thermal_data *data, u32 attr, int channel, long val)
	427	{
	428	switch (attr) {
	429	case hwmon_temp_min:
	430	case hwmon_temp_max:
	431	case hwmon_temp_crit:
	432	return emc1403_set_temp(data, channel, ema1403_temp_map[attr], val);
	433	case hwmon_temp_crit_hyst:
	434	return emc1403_set_hyst(data, val);
	435	default:
	436	return -EOPNOTSUPP;
	437	}
	438	}
	439
6a815781 GR	440	/* Lookup table for temperature conversion times in msec */
	441	static const u16 ina3221_conv_time[] = {
	442	16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62, 31, 16
	443	};
	444
	445	static int emc1403_set_convrate(struct thermal_data *data, unsigned int interval)
	446	{
	447	int convrate;
	448
	449	convrate = find_closest_descending(interval, ina3221_conv_time,
	450	ARRAY_SIZE(ina3221_conv_time));
	451	return regmap_write(data->regmap, 0x04, convrate);
	452	}
	453
	454	static int emc1403_chip_write(struct thermal_data *data, u32 attr, long val)
	455	{
	456	switch (attr) {
	457	case hwmon_chip_update_interval:
	458	return emc1403_set_convrate(data, clamp_val(val, 0, 100000));
	459	default:
	460	return -EOPNOTSUPP;
	461	}
	462	}
	463
1094360d GR	464	static int emc1403_write(struct device *dev, enum hwmon_sensor_types type,
	465	u32 attr, int channel, long val)
	466	{
	467	struct thermal_data *data = dev_get_drvdata(dev);
	468
	469	switch (type) {
	470	case hwmon_temp:
	471	return emc1403_temp_write(data, attr, channel, val);
6a815781 GR	472	case hwmon_chip:
6a815781 GR	473	return emc1403_chip_write(data, attr, val);
1094360d GR	474	default:
	475	return -EOPNOTSUPP;
	476	}
	477	}
	478
	479	static umode_t emc1403_temp_is_visible(const void *_data, u32 attr, int channel)
	480	{
	481	const struct thermal_data *data = _data;
	482
	483	if (data->chip == emc1402 && channel > 1)
	484	return 0;
	485	if (data->chip == emc1403 && channel > 2)
	486	return 0;
	487
	488	switch (attr) {
	489	case hwmon_temp_input:
	490	case hwmon_temp_min_alarm:
	491	case hwmon_temp_max_alarm:
	492	case hwmon_temp_crit_alarm:
	493	case hwmon_temp_fault:
	494	case hwmon_temp_min_hyst:
	495	case hwmon_temp_max_hyst:
	496	return 0444;
	497	case hwmon_temp_min:
	498	case hwmon_temp_max:
	499	case hwmon_temp_crit:
	500	return 0644;
	501	case hwmon_temp_crit_hyst:
	502	if (channel == 0)
	503	return 0644;
	504	return 0444;
	505	default:
	506	return 0;
	507	}
	508	}
	509
6a815781 GR	510	static umode_t emc1403_chip_is_visible(const void *_data, u32 attr)
	511	{
	512	switch (attr) {
	513	case hwmon_chip_update_interval:
	514	return 0644;
	515	default:
	516	return 0;
	517	}
	518	}
	519
1094360d GR	520	static umode_t emc1403_is_visible(const void *data, enum hwmon_sensor_types type,
	521	u32 attr, int channel)
	522	{
	523	switch (type) {
	524	case hwmon_temp:
	525	return emc1403_temp_is_visible(data, attr, channel);
6a815781 GR	526	case hwmon_chip:
6a815781 GR	527	return emc1403_chip_is_visible(data, attr);
1094360d GR	528	default:
	529	return 0;
	530	}
	531	}
	532
	533	static const struct hwmon_channel_info * const emc1403_info[] = {
6a815781	534	HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),
1094360d GR	535	HWMON_CHANNEL_INFO(temp,
	536	HWMON_T_INPUT \| HWMON_T_MIN \| HWMON_T_MAX \|
	537	HWMON_T_CRIT \| HWMON_T_MIN_HYST \| HWMON_T_MAX_HYST \|
	538	HWMON_T_CRIT_HYST \| HWMON_T_MIN_ALARM \|
	539	HWMON_T_MAX_ALARM \| HWMON_T_CRIT_ALARM,
	540	HWMON_T_INPUT \| HWMON_T_MIN \| HWMON_T_MAX \|
	541	HWMON_T_CRIT \| HWMON_T_MIN_HYST \| HWMON_T_MAX_HYST \|
	542	HWMON_T_CRIT_HYST \| HWMON_T_MIN_ALARM \|
	543	HWMON_T_MAX_ALARM \| HWMON_T_CRIT_ALARM \| HWMON_T_FAULT,
	544	HWMON_T_INPUT \| HWMON_T_MIN \| HWMON_T_MAX \|
	545	HWMON_T_CRIT \| HWMON_T_MIN_HYST \| HWMON_T_MAX_HYST \|
	546	HWMON_T_CRIT_HYST \| HWMON_T_MIN_ALARM \|
	547	HWMON_T_MAX_ALARM \| HWMON_T_CRIT_ALARM \| HWMON_T_FAULT,
	548	HWMON_T_INPUT \| HWMON_T_MIN \| HWMON_T_MAX \|
	549	HWMON_T_CRIT \| HWMON_T_MIN_HYST \| HWMON_T_MAX_HYST \|
	550	HWMON_T_CRIT_HYST \| HWMON_T_MIN_ALARM \|
	551	HWMON_T_MAX_ALARM \| HWMON_T_CRIT_ALARM \| HWMON_T_FAULT
	552	),
	553	NULL
	554	};
	555
	556	static const struct hwmon_ops emc1403_hwmon_ops = {
	557	.is_visible = emc1403_is_visible,
	558	.read = emc1403_read,
	559	.write = emc1403_write,
	560	};
	561
	562	static const struct hwmon_chip_info emc1403_chip_info = {
	563	.ops = &emc1403_hwmon_ops,
	564	.info = emc1403_info,
dac6831e KT	565	};
dac6831e KT	566
be7f5c4d	567	/* Last digit of chip name indicates number of channels */
dac6831e	568	static const struct i2c_device_id emc1403_idtable[] = {
be7f5c4d JG	569	{ "emc1402", emc1402 },
	570	{ "emc1403", emc1403 },
	571	{ "emc1404", emc1404 },
51585bef GR	572	{ "emc1412", emc1402 },
	573	{ "emc1413", emc1403 },
	574	{ "emc1414", emc1404 },
be7f5c4d JG	575	{ "emc1422", emc1402 },
	576	{ "emc1423", emc1403 },
	577	{ "emc1424", emc1404 },
9350163a	578	{ "emc1442", emc1402 },
dac6831e KT	579	{ }
	580	};
	581	MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
	582
1094360d GR	583	static int emc1403_probe(struct i2c_client *client)
	584	{
	585	struct thermal_data *data;
	586	struct device *hwmon_dev;
	587	const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
	588
	589	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
	590	GFP_KERNEL);
	591	if (!data)
	592	return -ENOMEM;
	593
	594	data->chip = id->driver_data;
	595	data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
	596	if (IS_ERR(data->regmap))
	597	return PTR_ERR(data->regmap);
	598
	599	mutex_init(&data->mutex);
	600
	601	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
	602	client->name, data,
	603	&emc1403_chip_info,
	604	emc1403_groups);
	605	return PTR_ERR_OR_ZERO(hwmon_dev);
	606	}
	607
	608	static const unsigned short emc1403_address_list[] = {
	609	0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
	610	};
	611
dac6831e KT	612	static struct i2c_driver sensor_emc1403 = {
	613	.class = I2C_CLASS_HWMON,
	614	.driver = {
	615	.name = "emc1403",
	616	},
	617	.detect = emc1403_detect,
1975d167	618	.probe = emc1403_probe,
dac6831e KT	619	.id_table = emc1403_idtable,
	620	.address_list = emc1403_address_list,
	621	};
	622
f0967eea	623	module_i2c_driver(sensor_emc1403);
dac6831e KT	624
	625	MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
	626	MODULE_DESCRIPTION("emc1403 Thermal Driver");
	627	MODULE_LICENSE("GPL v2");