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// 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 int tmp103_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *temp)
{
struct regmap *regmap = dev_get_drvdata(dev);
unsigned int regval;
int err, reg;
switch (attr) {
case hwmon_temp_input:
reg = TMP103_TEMP_REG;
break;
case hwmon_temp_min:
reg = TMP103_TLOW_REG;
break;
case hwmon_temp_max:
reg = TMP103_THIGH_REG;
break;
default:
return -EOPNOTSUPP;
}
err = regmap_read(regmap, reg, ®val);
if (err < 0)
return err;
*temp = tmp103_reg_to_mc(regval);
return 0;
}
static int tmp103_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long temp)
{
struct regmap *regmap = dev_get_drvdata(dev);
int reg;
switch (attr) {
case hwmon_temp_min:
reg = TMP103_TLOW_REG;
break;
case hwmon_temp_max:
reg = TMP103_THIGH_REG;
break;
default:
return -EOPNOTSUPP;
}
temp = clamp_val(temp, -55000, 127000);
return regmap_write(regmap, reg, tmp103_mc_to_reg(temp));
}
static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
if (type != hwmon_temp)
return 0;
switch (attr) {
case hwmon_temp_input:
return 0444;
case hwmon_temp_min:
case hwmon_temp_max:
return 0644;
default:
return 0;
}
}
static const struct hwmon_channel_info *tmp103_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_REGISTER_TZ),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN),
NULL
};
static const struct hwmon_ops tmp103_hwmon_ops = {
.is_visible = tmp103_is_visible,
.read = tmp103_read,
.write = tmp103_write,
};
static const struct hwmon_chip_info tmp103_chip_info = {
.ops = &tmp103_hwmon_ops,
.info = tmp103_info,
};
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)
{
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_info(dev, client->name,
regmap,
&tmp103_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static int 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 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 DEFINE_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 = pm_sleep_ptr(&tmp103_dev_pm_ops),
},
.probe_new = 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");
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