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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Texas Instruments TMP103 SMBus temperature sensor driver
- * Copyright (C) 2014 Heiko Schocher <[email protected]>
- *
- * Based on:
- * Texas Instruments TMP102 SMBus temperature sensor driver
- *
- * Copyright (C) 2010 Steven King <[email protected]>
- */
- #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 <[email protected]>");
- MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
- MODULE_LICENSE("GPL");
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