[linux-block.git] / drivers / hwmon / tmp103.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Texas Instruments TMP103 SMBus temperature sensor driver
 * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
 *
 * Based on:
 * Texas Instruments TMP102 SMBus temperature sensor driver
 *
 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
 */

#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/mutex.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>

#define TMP103_TEMP_REG		0x00
#define TMP103_CONF_REG		0x01
#define TMP103_TLOW_REG		0x02
#define TMP103_THIGH_REG	0x03

#define TMP103_CONF_M0		0x01
#define TMP103_CONF_M1		0x02
#define TMP103_CONF_LC		0x04
#define TMP103_CONF_FL		0x08
#define TMP103_CONF_FH		0x10
#define TMP103_CONF_CR0		0x20
#define TMP103_CONF_CR1		0x40
#define TMP103_CONF_ID		0x80
#define TMP103_CONF_SD		(TMP103_CONF_M1)
#define TMP103_CONF_SD_MASK	(TMP103_CONF_M0 | TMP103_CONF_M1)

#define TMP103_CONFIG		(TMP103_CONF_CR1 | TMP103_CONF_M1)
#define TMP103_CONFIG_MASK	(TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
				 TMP103_CONF_M0 | TMP103_CONF_M1)

static inline int tmp103_reg_to_mc(s8 val)
{
	return val * 1000;
}

static inline u8 tmp103_mc_to_reg(int val)
{
	return DIV_ROUND_CLOSEST(val, 1000);
}

static ssize_t tmp103_temp_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct regmap *regmap = dev_get_drvdata(dev);
	unsigned int regval;
	int ret;

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

	return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
}

static ssize_t tmp103_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 regmap *regmap = dev_get_drvdata(dev);
	long val;
	int ret;

	if (kstrtol(buf, 10, &val) < 0)
		return -EINVAL;

	val = clamp_val(val, -55000, 127000);
	ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
	return ret ? ret : count;
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG);

static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG);

static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG);

static struct attribute *tmp103_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(tmp103);

static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
{
	return reg == TMP103_TEMP_REG;
}

static const struct regmap_config tmp103_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = TMP103_THIGH_REG,
	.volatile_reg = tmp103_regmap_is_volatile,
};

static int tmp103_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct device *hwmon_dev;
	struct regmap *regmap;
	int ret;

	regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(dev, "failed to allocate register map\n");
		return PTR_ERR(regmap);
	}

	ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
				 TMP103_CONFIG);
	if (ret < 0) {
		dev_err(&client->dev, "error writing config register\n");
		return ret;
	}

	i2c_set_clientdata(client, regmap);
	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
						      regmap, tmp103_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static int __maybe_unused tmp103_suspend(struct device *dev)
{
	struct regmap *regmap = dev_get_drvdata(dev);

	return regmap_update_bits(regmap, TMP103_CONF_REG,
				  TMP103_CONF_SD_MASK, 0);
}

static int __maybe_unused tmp103_resume(struct device *dev)
{
	struct regmap *regmap = dev_get_drvdata(dev);

	return regmap_update_bits(regmap, TMP103_CONF_REG,
				  TMP103_CONF_SD_MASK, TMP103_CONF_SD);
}

static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);

static const struct i2c_device_id tmp103_id[] = {
	{ "tmp103", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tmp103_id);

static const struct of_device_id __maybe_unused tmp103_of_match[] = {
	{ .compatible = "ti,tmp103" },
	{ },
};
MODULE_DEVICE_TABLE(of, tmp103_of_match);

static struct i2c_driver tmp103_driver = {
	.driver = {
		.name	= "tmp103",
		.of_match_table = of_match_ptr(tmp103_of_match),
		.pm	= &tmp103_dev_pm_ops,
	},
	.probe		= tmp103_probe,
	.id_table	= tmp103_id,
};

module_i2c_driver(tmp103_driver);

MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
d17a7dca HS	2	/*
	3	* Texas Instruments TMP103 SMBus temperature sensor driver
	4	* Copyright (C) 2014 Heiko Schocher <hs@denx.de>
	5	*
	6	* Based on:
	7	* Texas Instruments TMP102 SMBus temperature sensor driver
	8	*
	9	* Copyright (C) 2010 Steven King <sfking@fdwdc.com>
d17a7dca HS	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/mutex.h>
	20	#include <linux/device.h>
	21	#include <linux/jiffies.h>
	22	#include <linux/regmap.h>
	23
	24	#define TMP103_TEMP_REG 0x00
	25	#define TMP103_CONF_REG 0x01
	26	#define TMP103_TLOW_REG 0x02
	27	#define TMP103_THIGH_REG 0x03
	28
	29	#define TMP103_CONF_M0 0x01
	30	#define TMP103_CONF_M1 0x02
	31	#define TMP103_CONF_LC 0x04
	32	#define TMP103_CONF_FL 0x08
	33	#define TMP103_CONF_FH 0x10
	34	#define TMP103_CONF_CR0 0x20
	35	#define TMP103_CONF_CR1 0x40
	36	#define TMP103_CONF_ID 0x80
	37	#define TMP103_CONF_SD (TMP103_CONF_M1)
	38	#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 \| TMP103_CONF_M1)
	39
	40	#define TMP103_CONFIG (TMP103_CONF_CR1 \| TMP103_CONF_M1)
	41	#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 \| TMP103_CONF_CR1 \| \
	42	TMP103_CONF_M0 \| TMP103_CONF_M1)
	43
	44	static inline int tmp103_reg_to_mc(s8 val)
	45	{
	46	return val * 1000;
	47	}
	48
	49	static inline u8 tmp103_mc_to_reg(int val)
	50	{
	51	return DIV_ROUND_CLOSEST(val, 1000);
	52	}
	53
69dd7cdb GR	54	static ssize_t tmp103_temp_show(struct device *dev,
69dd7cdb GR	55	struct device_attribute attr, char buf)
d17a7dca HS	56	{
	57	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	58	struct regmap *regmap = dev_get_drvdata(dev);
	59	unsigned int regval;
	60	int ret;
	61
	62	ret = regmap_read(regmap, sda->index, &regval);
	63	if (ret < 0)
	64	return ret;
	65
	66	return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
	67	}
	68
69dd7cdb GR	69	static ssize_t tmp103_temp_store(struct device *dev,
	70	struct device_attribute *attr,
	71	const char *buf, size_t count)
d17a7dca HS	72	{
	73	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	74	struct regmap *regmap = dev_get_drvdata(dev);
	75	long val;
	76	int ret;
	77
	78	if (kstrtol(buf, 10, &val) < 0)
	79	return -EINVAL;
	80
	81	val = clamp_val(val, -55000, 127000);
	82	ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
	83	return ret ? ret : count;
	84	}
	85
69dd7cdb	86	static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG);
d17a7dca	87
69dd7cdb	88	static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG);
d17a7dca	89
69dd7cdb	90	static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG);
d17a7dca HS	91
	92	static struct attribute *tmp103_attrs[] = {
	93	&sensor_dev_attr_temp1_input.dev_attr.attr,
	94	&sensor_dev_attr_temp1_min.dev_attr.attr,
	95	&sensor_dev_attr_temp1_max.dev_attr.attr,
	96	NULL
	97	};
	98	ATTRIBUTE_GROUPS(tmp103);
	99
	100	static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
	101	{
	102	return reg == TMP103_TEMP_REG;
	103	}
	104
034b44b4	105	static const struct regmap_config tmp103_regmap_config = {
d17a7dca HS	106	.reg_bits = 8,
	107	.val_bits = 8,
	108	.max_register = TMP103_THIGH_REG,
	109	.volatile_reg = tmp103_regmap_is_volatile,
	110	};
	111
	112	static int tmp103_probe(struct i2c_client *client,
	113	const struct i2c_device_id *id)
	114	{
	115	struct device *dev = &client->dev;
	116	struct device *hwmon_dev;
	117	struct regmap *regmap;
	118	int ret;
	119
d17a7dca HS	120	regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
	121	if (IS_ERR(regmap)) {
	122	dev_err(dev, "failed to allocate register map\n");
	123	return PTR_ERR(regmap);
	124	}
	125
	126	ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
	127	TMP103_CONFIG);
	128	if (ret < 0) {
	129	dev_err(&client->dev, "error writing config register\n");
	130	return ret;
	131	}
	132
233adcef	133	i2c_set_clientdata(client, regmap);
4e66cd13	134	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
d17a7dca HS	135	regmap, tmp103_groups);
	136	return PTR_ERR_OR_ZERO(hwmon_dev);
	137	}
	138
39c382a3	139	static int __maybe_unused tmp103_suspend(struct device *dev)
d17a7dca HS	140	{
	141	struct regmap *regmap = dev_get_drvdata(dev);
	142
	143	return regmap_update_bits(regmap, TMP103_CONF_REG,
	144	TMP103_CONF_SD_MASK, 0);
	145	}
	146
39c382a3	147	static int __maybe_unused tmp103_resume(struct device *dev)
d17a7dca HS	148	{
	149	struct regmap *regmap = dev_get_drvdata(dev);
	150
	151	return regmap_update_bits(regmap, TMP103_CONF_REG,
	152	TMP103_CONF_SD_MASK, TMP103_CONF_SD);
	153	}
	154
39c382a3	155	static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
d17a7dca HS	156
	157	static const struct i2c_device_id tmp103_id[] = {
	158	{ "tmp103", 0 },
	159	{ }
	160	};
	161	MODULE_DEVICE_TABLE(i2c, tmp103_id);
	162
20894216	163	static const struct of_device_id __maybe_unused tmp103_of_match[] = {
72fc64c6 JMC	164	{ .compatible = "ti,tmp103" },
	165	{ },
	166	};
	167	MODULE_DEVICE_TABLE(of, tmp103_of_match);
	168
d17a7dca HS	169	static struct i2c_driver tmp103_driver = {
	170	.driver = {
	171	.name = "tmp103",
72fc64c6	172	.of_match_table = of_match_ptr(tmp103_of_match),
39c382a3	173	.pm = &tmp103_dev_pm_ops,
d17a7dca HS	174	},
	175	.probe = tmp103_probe,
	176	.id_table = tmp103_id,
	177	};
	178
	179	module_i2c_driver(tmp103_driver);
	180
	181	MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
	182	MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
	183	MODULE_LICENSE("GPL");