| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Texas Instruments TMP103 SMBus temperature sensor driver |
| 4 | * Copyright (C) 2014 Heiko Schocher <hs@denx.de> |
| 5 | * |
| 6 | * Based on: |
| 7 | * Texas Instruments TMP102 SMBus temperature sensor driver |
| 8 | * |
| 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 0x00 |
| 25 | #define TMP103_CONF_REG 0x01 |
| 26 | #define TMP103_TLOW_REG 0x02 |
| 27 | #define TMP103_THIGH_REG 0x03 |
| 28 | |
| 29 | #define TMP103_CONF_M0 0x01 |
| 30 | #define TMP103_CONF_M1 0x02 |
| 31 | #define TMP103_CONF_LC 0x04 |
| 32 | #define TMP103_CONF_FL 0x08 |
| 33 | #define TMP103_CONF_FH 0x10 |
| 34 | #define TMP103_CONF_CR0 0x20 |
| 35 | #define TMP103_CONF_CR1 0x40 |
| 36 | #define TMP103_CONF_ID 0x80 |
| 37 | #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 | |
| 44 | static inline int tmp103_reg_to_mc(s8 val) |
| 45 | { |
| 46 | return val * 1000; |
| 47 | } |
| 48 | |
| 49 | static inline u8 tmp103_mc_to_reg(int val) |
| 50 | { |
| 51 | return DIV_ROUND_CLOSEST(val, 1000); |
| 52 | } |
| 53 | |
| 54 | static 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 | |
| 84 | static 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 | |
| 105 | static 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 | |
| 122 | static 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 | NULL |
| 128 | }; |
| 129 | |
| 130 | static const struct hwmon_ops tmp103_hwmon_ops = { |
| 131 | .is_visible = tmp103_is_visible, |
| 132 | .read = tmp103_read, |
| 133 | .write = tmp103_write, |
| 134 | }; |
| 135 | |
| 136 | static const struct hwmon_chip_info tmp103_chip_info = { |
| 137 | .ops = &tmp103_hwmon_ops, |
| 138 | .info = tmp103_info, |
| 139 | }; |
| 140 | |
| 141 | static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) |
| 142 | { |
| 143 | return reg == TMP103_TEMP_REG; |
| 144 | } |
| 145 | |
| 146 | static 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 | |
| 153 | static 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 | |
| 181 | static 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 | |
| 189 | static 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 | |
| 197 | static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); |
| 198 | |
| 199 | static const struct i2c_device_id tmp103_id[] = { |
| 200 | { "tmp103" }, |
| 201 | { } |
| 202 | }; |
| 203 | MODULE_DEVICE_TABLE(i2c, tmp103_id); |
| 204 | |
| 205 | static const struct of_device_id __maybe_unused tmp103_of_match[] = { |
| 206 | { .compatible = "ti,tmp103" }, |
| 207 | { }, |
| 208 | }; |
| 209 | MODULE_DEVICE_TABLE(of, tmp103_of_match); |
| 210 | |
| 211 | static 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 | |
| 221 | module_i2c_driver(tmp103_driver); |
| 222 | |
| 223 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); |
| 224 | MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); |
| 225 | MODULE_LICENSE("GPL"); |