diff options
Diffstat (limited to 'drivers/hwmon/tmp103.c')
| -rw-r--r-- | drivers/hwmon/tmp103.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/hwmon/tmp103.c b/drivers/hwmon/tmp103.c new file mode 100644 index 0000000000..a84c29a3a7 --- /dev/null +++ b/drivers/hwmon/tmp103.c @@ -0,0 +1,225 @@ +// 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 * const 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 = 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"); |