/*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#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_show_temp(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, ®val);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
}
static ssize_t tmp103_set_temp(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(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
TMP103_TEMP_REG);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
tmp103_set_temp, TMP103_TLOW_REG);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
tmp103_set_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);
}
#ifdef CONFIG_PM
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 const struct dev_pm_ops tmp103_dev_pm_ops = {
.suspend = tmp103_suspend,
.resume = tmp103_resume,
};
#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
#else
#define TMP103_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static const struct i2c_device_id tmp103_id[] = {
{ "tmp103", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp103_id);
static struct i2c_driver tmp103_driver = {
.driver = {
.name = "tmp103",
.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");
