226 lines
5.1 KiB
C
226 lines
5.1 KiB
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 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 __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_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");
|