| /* |
| * Texas Instruments TMP103 SMBus temperature sensor driver |
| * Copyright (C) 2014 Heiko Schocher <hs@denx.de> |
| * |
| * Based on: |
| * Texas Instruments TMP102 SMBus temperature sensor driver |
| * |
| * Copyright (C) 2010 Steven King <sfking@fdwdc.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #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 ssize_t tmp103_show_temp(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); |
| struct regmap *regmap = dev_get_drvdata(dev); |
| unsigned int regval; |
| int ret; |
| |
| ret = regmap_read(regmap, sda->index, ®val); |
| if (ret < 0) |
| return ret; |
| |
| return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval)); |
| } |
| |
| static ssize_t tmp103_set_temp(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); |
| struct regmap *regmap = dev_get_drvdata(dev); |
| long val; |
| int ret; |
| |
| if (kstrtol(buf, 10, &val) < 0) |
| return -EINVAL; |
| |
| val = clamp_val(val, -55000, 127000); |
| ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val)); |
| return ret ? ret : count; |
| } |
| |
| static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL , |
| TMP103_TEMP_REG); |
| |
| static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp, |
| tmp103_set_temp, TMP103_TLOW_REG); |
| |
| static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp, |
| tmp103_set_temp, TMP103_THIGH_REG); |
| |
| static struct attribute *tmp103_attrs[] = { |
| &sensor_dev_attr_temp1_input.dev_attr.attr, |
| &sensor_dev_attr_temp1_min.dev_attr.attr, |
| &sensor_dev_attr_temp1_max.dev_attr.attr, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(tmp103); |
| |
| static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) |
| { |
| return reg == TMP103_TEMP_REG; |
| } |
| |
| static 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, |
| const struct i2c_device_id *id) |
| { |
| struct device *dev = &client->dev; |
| struct device *hwmon_dev; |
| struct regmap *regmap; |
| int ret; |
| |
| if (!i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_BYTE_DATA)) { |
| dev_err(&client->dev, |
| "adapter doesn't support SMBus byte transactions\n"); |
| return -ENODEV; |
| } |
| |
| 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 = hwmon_device_register_with_groups(dev, client->name, |
| regmap, tmp103_groups); |
| return PTR_ERR_OR_ZERO(hwmon_dev); |
| } |
| |
| #ifdef CONFIG_PM |
| 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 const struct dev_pm_ops tmp103_dev_pm_ops = { |
| .suspend = tmp103_suspend, |
| .resume = tmp103_resume, |
| }; |
| |
| #define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops) |
| #else |
| #define TMP103_DEV_PM_OPS NULL |
| #endif /* CONFIG_PM */ |
| |
| static const struct i2c_device_id tmp103_id[] = { |
| { "tmp103", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, tmp103_id); |
| |
| static struct i2c_driver tmp103_driver = { |
| .driver = { |
| .name = "tmp103", |
| .pm = TMP103_DEV_PM_OPS, |
| }, |
| .probe = tmp103_probe, |
| .id_table = tmp103_id, |
| }; |
| |
| module_i2c_driver(tmp103_driver); |
| |
| MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); |
| MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); |
| MODULE_LICENSE("GPL"); |