diff options
Diffstat (limited to 'drivers/hwmon/tmp103.c')
| -rw-r--r-- | drivers/hwmon/tmp103.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/hwmon/tmp103.c b/drivers/hwmon/tmp103.c new file mode 100644 index 000000000000..e69dbcacac89 --- /dev/null +++ b/drivers/hwmon/tmp103.c @@ -0,0 +1,205 @@ +/* + * 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; + } + + 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"); |