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 ssize_t tmp103_temp_show(struct device *dev, 55 struct device_attribute *attr, char *buf) 56 { 57 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); 58 struct regmap *regmap = dev_get_drvdata(dev); 59 unsigned int regval; 60 int ret; 61 62 ret = regmap_read(regmap, sda->index, ®val); 63 if (ret < 0) 64 return ret; 65 66 return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval)); 67 } 68 69 static ssize_t tmp103_temp_store(struct device *dev, 70 struct device_attribute *attr, 71 const char *buf, size_t count) 72 { 73 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); 74 struct regmap *regmap = dev_get_drvdata(dev); 75 long val; 76 int ret; 77 78 if (kstrtol(buf, 10, &val) < 0) 79 return -EINVAL; 80 81 val = clamp_val(val, -55000, 127000); 82 ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val)); 83 return ret ? ret : count; 84 } 85 86 static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG); 87 88 static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG); 89 90 static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG); 91 92 static struct attribute *tmp103_attrs[] = { 93 &sensor_dev_attr_temp1_input.dev_attr.attr, 94 &sensor_dev_attr_temp1_min.dev_attr.attr, 95 &sensor_dev_attr_temp1_max.dev_attr.attr, 96 NULL 97 }; 98 ATTRIBUTE_GROUPS(tmp103); 99 100 static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) 101 { 102 return reg == TMP103_TEMP_REG; 103 } 104 105 static const struct regmap_config tmp103_regmap_config = { 106 .reg_bits = 8, 107 .val_bits = 8, 108 .max_register = TMP103_THIGH_REG, 109 .volatile_reg = tmp103_regmap_is_volatile, 110 }; 111 112 static int tmp103_probe(struct i2c_client *client) 113 { 114 struct device *dev = &client->dev; 115 struct device *hwmon_dev; 116 struct regmap *regmap; 117 int ret; 118 119 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); 120 if (IS_ERR(regmap)) { 121 dev_err(dev, "failed to allocate register map\n"); 122 return PTR_ERR(regmap); 123 } 124 125 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK, 126 TMP103_CONFIG); 127 if (ret < 0) { 128 dev_err(&client->dev, "error writing config register\n"); 129 return ret; 130 } 131 132 i2c_set_clientdata(client, regmap); 133 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 134 regmap, tmp103_groups); 135 return PTR_ERR_OR_ZERO(hwmon_dev); 136 } 137 138 static int __maybe_unused tmp103_suspend(struct device *dev) 139 { 140 struct regmap *regmap = dev_get_drvdata(dev); 141 142 return regmap_update_bits(regmap, TMP103_CONF_REG, 143 TMP103_CONF_SD_MASK, 0); 144 } 145 146 static int __maybe_unused tmp103_resume(struct device *dev) 147 { 148 struct regmap *regmap = dev_get_drvdata(dev); 149 150 return regmap_update_bits(regmap, TMP103_CONF_REG, 151 TMP103_CONF_SD_MASK, TMP103_CONF_SD); 152 } 153 154 static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); 155 156 static const struct i2c_device_id tmp103_id[] = { 157 { "tmp103", 0 }, 158 { } 159 }; 160 MODULE_DEVICE_TABLE(i2c, tmp103_id); 161 162 static const struct of_device_id __maybe_unused tmp103_of_match[] = { 163 { .compatible = "ti,tmp103" }, 164 { }, 165 }; 166 MODULE_DEVICE_TABLE(of, tmp103_of_match); 167 168 static struct i2c_driver tmp103_driver = { 169 .driver = { 170 .name = "tmp103", 171 .of_match_table = of_match_ptr(tmp103_of_match), 172 .pm = &tmp103_dev_pm_ops, 173 }, 174 .probe_new = tmp103_probe, 175 .id_table = tmp103_id, 176 }; 177 178 module_i2c_driver(tmp103_driver); 179 180 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); 181 MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); 182 MODULE_LICENSE("GPL"); 183