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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Texas Instruments TMP103 SMBus temperature sensor driver4 * Copyright (C) 2014 Heiko Schocher <hs@denx.de>5 *6 * Based on:7 * Texas Instruments TMP102 SMBus temperature sensor driver8 *9 * Copyright (C) 2010 Steven King <sfking@fdwdc.com>10 */11 12#include <linux/module.h>13#include <linux/init.h>14#include <linux/slab.h>15#include <linux/i2c.h>16#include <linux/hwmon.h>17#include <linux/hwmon-sysfs.h>18#include <linux/err.h>19#include <linux/mutex.h>20#include <linux/device.h>21#include <linux/jiffies.h>22#include <linux/regmap.h>23 24#define TMP103_TEMP_REG 0x0025#define TMP103_CONF_REG 0x0126#define TMP103_TLOW_REG 0x0227#define TMP103_THIGH_REG 0x0328 29#define TMP103_CONF_M0 0x0130#define TMP103_CONF_M1 0x0231#define TMP103_CONF_LC 0x0432#define TMP103_CONF_FL 0x0833#define TMP103_CONF_FH 0x1034#define TMP103_CONF_CR0 0x2035#define TMP103_CONF_CR1 0x4036#define TMP103_CONF_ID 0x8037#define TMP103_CONF_SD (TMP103_CONF_M1)38#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)39 40#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)41#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \42 TMP103_CONF_M0 | TMP103_CONF_M1)43 44static inline int tmp103_reg_to_mc(s8 val)45{46 return val * 1000;47}48 49static inline u8 tmp103_mc_to_reg(int val)50{51 return DIV_ROUND_CLOSEST(val, 1000);52}53 54static int tmp103_read(struct device *dev, enum hwmon_sensor_types type,55 u32 attr, int channel, long *temp)56{57 struct regmap *regmap = dev_get_drvdata(dev);58 unsigned int regval;59 int err, reg;60 61 switch (attr) {62 case hwmon_temp_input:63 reg = TMP103_TEMP_REG;64 break;65 case hwmon_temp_min:66 reg = TMP103_TLOW_REG;67 break;68 case hwmon_temp_max:69 reg = TMP103_THIGH_REG;70 break;71 default:72 return -EOPNOTSUPP;73 }74 75 err = regmap_read(regmap, reg, ®val);76 if (err < 0)77 return err;78 79 *temp = tmp103_reg_to_mc(regval);80 81 return 0;82}83 84static int tmp103_write(struct device *dev, enum hwmon_sensor_types type,85 u32 attr, int channel, long temp)86{87 struct regmap *regmap = dev_get_drvdata(dev);88 int reg;89 90 switch (attr) {91 case hwmon_temp_min:92 reg = TMP103_TLOW_REG;93 break;94 case hwmon_temp_max:95 reg = TMP103_THIGH_REG;96 break;97 default:98 return -EOPNOTSUPP;99 }100 101 temp = clamp_val(temp, -55000, 127000);102 return regmap_write(regmap, reg, tmp103_mc_to_reg(temp));103}104 105static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type,106 u32 attr, int channel)107{108 if (type != hwmon_temp)109 return 0;110 111 switch (attr) {112 case hwmon_temp_input:113 return 0444;114 case hwmon_temp_min:115 case hwmon_temp_max:116 return 0644;117 default:118 return 0;119 }120}121 122static const struct hwmon_channel_info * const tmp103_info[] = {123 HWMON_CHANNEL_INFO(chip,124 HWMON_C_REGISTER_TZ),125 HWMON_CHANNEL_INFO(temp,126 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN),127 NULL128};129 130static const struct hwmon_ops tmp103_hwmon_ops = {131 .is_visible = tmp103_is_visible,132 .read = tmp103_read,133 .write = tmp103_write,134};135 136static const struct hwmon_chip_info tmp103_chip_info = {137 .ops = &tmp103_hwmon_ops,138 .info = tmp103_info,139};140 141static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)142{143 return reg == TMP103_TEMP_REG;144}145 146static const struct regmap_config tmp103_regmap_config = {147 .reg_bits = 8,148 .val_bits = 8,149 .max_register = TMP103_THIGH_REG,150 .volatile_reg = tmp103_regmap_is_volatile,151};152 153static int tmp103_probe(struct i2c_client *client)154{155 struct device *dev = &client->dev;156 struct device *hwmon_dev;157 struct regmap *regmap;158 int ret;159 160 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);161 if (IS_ERR(regmap)) {162 dev_err(dev, "failed to allocate register map\n");163 return PTR_ERR(regmap);164 }165 166 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,167 TMP103_CONFIG);168 if (ret < 0) {169 dev_err(&client->dev, "error writing config register\n");170 return ret;171 }172 173 i2c_set_clientdata(client, regmap);174 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,175 regmap,176 &tmp103_chip_info,177 NULL);178 return PTR_ERR_OR_ZERO(hwmon_dev);179}180 181static int tmp103_suspend(struct device *dev)182{183 struct regmap *regmap = dev_get_drvdata(dev);184 185 return regmap_update_bits(regmap, TMP103_CONF_REG,186 TMP103_CONF_SD_MASK, 0);187}188 189static int tmp103_resume(struct device *dev)190{191 struct regmap *regmap = dev_get_drvdata(dev);192 193 return regmap_update_bits(regmap, TMP103_CONF_REG,194 TMP103_CONF_SD_MASK, TMP103_CONF_SD);195}196 197static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);198 199static const struct i2c_device_id tmp103_id[] = {200 { "tmp103" },201 { }202};203MODULE_DEVICE_TABLE(i2c, tmp103_id);204 205static const struct of_device_id __maybe_unused tmp103_of_match[] = {206 { .compatible = "ti,tmp103" },207 { },208};209MODULE_DEVICE_TABLE(of, tmp103_of_match);210 211static struct i2c_driver tmp103_driver = {212 .driver = {213 .name = "tmp103",214 .of_match_table = of_match_ptr(tmp103_of_match),215 .pm = pm_sleep_ptr(&tmp103_dev_pm_ops),216 },217 .probe = tmp103_probe,218 .id_table = tmp103_id,219};220 221module_i2c_driver(tmp103_driver);222 223MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");224MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");225MODULE_LICENSE("GPL");226