1 /* 2 * Texas Instruments TMP103 SMBus temperature sensor driver 3 * Copyright (C) 2014 Heiko Schocher <hs@denx.de> 4 * 5 * Based on: 6 * Texas Instruments TMP102 SMBus temperature sensor driver 7 * 8 * Copyright (C) 2010 Steven King <sfking@fdwdc.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 */ 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/i2c.h> 26 #include <linux/hwmon.h> 27 #include <linux/hwmon-sysfs.h> 28 #include <linux/err.h> 29 #include <linux/mutex.h> 30 #include <linux/device.h> 31 #include <linux/jiffies.h> 32 #include <linux/regmap.h> 33 34 #define TMP103_TEMP_REG 0x00 35 #define TMP103_CONF_REG 0x01 36 #define TMP103_TLOW_REG 0x02 37 #define TMP103_THIGH_REG 0x03 38 39 #define TMP103_CONF_M0 0x01 40 #define TMP103_CONF_M1 0x02 41 #define TMP103_CONF_LC 0x04 42 #define TMP103_CONF_FL 0x08 43 #define TMP103_CONF_FH 0x10 44 #define TMP103_CONF_CR0 0x20 45 #define TMP103_CONF_CR1 0x40 46 #define TMP103_CONF_ID 0x80 47 #define TMP103_CONF_SD (TMP103_CONF_M1) 48 #define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1) 49 50 #define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1) 51 #define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \ 52 TMP103_CONF_M0 | TMP103_CONF_M1) 53 54 static inline int tmp103_reg_to_mc(s8 val) 55 { 56 return val * 1000; 57 } 58 59 static inline u8 tmp103_mc_to_reg(int val) 60 { 61 return DIV_ROUND_CLOSEST(val, 1000); 62 } 63 64 static ssize_t tmp103_temp_show(struct device *dev, 65 struct device_attribute *attr, char *buf) 66 { 67 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); 68 struct regmap *regmap = dev_get_drvdata(dev); 69 unsigned int regval; 70 int ret; 71 72 ret = regmap_read(regmap, sda->index, ®val); 73 if (ret < 0) 74 return ret; 75 76 return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval)); 77 } 78 79 static ssize_t tmp103_temp_store(struct device *dev, 80 struct device_attribute *attr, 81 const char *buf, size_t count) 82 { 83 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); 84 struct regmap *regmap = dev_get_drvdata(dev); 85 long val; 86 int ret; 87 88 if (kstrtol(buf, 10, &val) < 0) 89 return -EINVAL; 90 91 val = clamp_val(val, -55000, 127000); 92 ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val)); 93 return ret ? ret : count; 94 } 95 96 static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG); 97 98 static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG); 99 100 static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG); 101 102 static struct attribute *tmp103_attrs[] = { 103 &sensor_dev_attr_temp1_input.dev_attr.attr, 104 &sensor_dev_attr_temp1_min.dev_attr.attr, 105 &sensor_dev_attr_temp1_max.dev_attr.attr, 106 NULL 107 }; 108 ATTRIBUTE_GROUPS(tmp103); 109 110 static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) 111 { 112 return reg == TMP103_TEMP_REG; 113 } 114 115 static const struct regmap_config tmp103_regmap_config = { 116 .reg_bits = 8, 117 .val_bits = 8, 118 .max_register = TMP103_THIGH_REG, 119 .volatile_reg = tmp103_regmap_is_volatile, 120 }; 121 122 static int tmp103_probe(struct i2c_client *client, 123 const struct i2c_device_id *id) 124 { 125 struct device *dev = &client->dev; 126 struct device *hwmon_dev; 127 struct regmap *regmap; 128 int ret; 129 130 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); 131 if (IS_ERR(regmap)) { 132 dev_err(dev, "failed to allocate register map\n"); 133 return PTR_ERR(regmap); 134 } 135 136 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK, 137 TMP103_CONFIG); 138 if (ret < 0) { 139 dev_err(&client->dev, "error writing config register\n"); 140 return ret; 141 } 142 143 i2c_set_clientdata(client, regmap); 144 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 145 regmap, tmp103_groups); 146 return PTR_ERR_OR_ZERO(hwmon_dev); 147 } 148 149 static int __maybe_unused tmp103_suspend(struct device *dev) 150 { 151 struct regmap *regmap = dev_get_drvdata(dev); 152 153 return regmap_update_bits(regmap, TMP103_CONF_REG, 154 TMP103_CONF_SD_MASK, 0); 155 } 156 157 static int __maybe_unused tmp103_resume(struct device *dev) 158 { 159 struct regmap *regmap = dev_get_drvdata(dev); 160 161 return regmap_update_bits(regmap, TMP103_CONF_REG, 162 TMP103_CONF_SD_MASK, TMP103_CONF_SD); 163 } 164 165 static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); 166 167 static const struct i2c_device_id tmp103_id[] = { 168 { "tmp103", 0 }, 169 { } 170 }; 171 MODULE_DEVICE_TABLE(i2c, tmp103_id); 172 173 static const struct of_device_id tmp103_of_match[] = { 174 { .compatible = "ti,tmp103" }, 175 { }, 176 }; 177 MODULE_DEVICE_TABLE(of, tmp103_of_match); 178 179 static struct i2c_driver tmp103_driver = { 180 .driver = { 181 .name = "tmp103", 182 .of_match_table = of_match_ptr(tmp103_of_match), 183 .pm = &tmp103_dev_pm_ops, 184 }, 185 .probe = tmp103_probe, 186 .id_table = tmp103_id, 187 }; 188 189 module_i2c_driver(tmp103_driver); 190 191 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); 192 MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); 193 MODULE_LICENSE("GPL"); 194