200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/*
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* Texas Instruments TMP103 SMBus temperature sensor driver
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* Copyright (C) 2014 Heiko Schocher <hs@denx.de>
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*
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* Based on:
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* Texas Instruments TMP102 SMBus temperature sensor driver
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*
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* Copyright (C) 2010 Steven King <sfking@fdwdc.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/jiffies.h>
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#include <linux/regmap.h>
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#define TMP103_TEMP_REG 0x00
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#define TMP103_CONF_REG 0x01
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#define TMP103_TLOW_REG 0x02
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#define TMP103_THIGH_REG 0x03
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#define TMP103_CONF_M0 0x01
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#define TMP103_CONF_M1 0x02
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#define TMP103_CONF_LC 0x04
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#define TMP103_CONF_FL 0x08
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#define TMP103_CONF_FH 0x10
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#define TMP103_CONF_CR0 0x20
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#define TMP103_CONF_CR1 0x40
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#define TMP103_CONF_ID 0x80
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#define TMP103_CONF_SD (TMP103_CONF_M1)
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#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
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#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
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#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
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TMP103_CONF_M0 | TMP103_CONF_M1)
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static inline int tmp103_reg_to_mc(s8 val)
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{
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return val * 1000;
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}
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static inline u8 tmp103_mc_to_reg(int val)
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{
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return DIV_ROUND_CLOSEST(val, 1000);
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}
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static ssize_t tmp103_show_temp(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct regmap *regmap = dev_get_drvdata(dev);
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unsigned int regval;
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int ret;
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ret = regmap_read(regmap, sda->index, ®val);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
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}
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static ssize_t tmp103_set_temp(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct regmap *regmap = dev_get_drvdata(dev);
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long val;
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int ret;
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if (kstrtol(buf, 10, &val) < 0)
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return -EINVAL;
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val = clamp_val(val, -55000, 127000);
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ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
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return ret ? ret : count;
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
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TMP103_TEMP_REG);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
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tmp103_set_temp, TMP103_TLOW_REG);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
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tmp103_set_temp, TMP103_THIGH_REG);
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static struct attribute *tmp103_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(tmp103);
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static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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return reg == TMP103_TEMP_REG;
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}
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static const struct regmap_config tmp103_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = TMP103_THIGH_REG,
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.volatile_reg = tmp103_regmap_is_volatile,
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};
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static int tmp103_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct regmap *regmap;
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int ret;
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regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "failed to allocate register map\n");
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return PTR_ERR(regmap);
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}
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ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
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TMP103_CONFIG);
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if (ret < 0) {
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dev_err(&client->dev, "error writing config register\n");
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return ret;
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}
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i2c_set_clientdata(client, regmap);
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hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
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regmap, tmp103_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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#ifdef CONFIG_PM
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static int tmp103_suspend(struct device *dev)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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return regmap_update_bits(regmap, TMP103_CONF_REG,
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TMP103_CONF_SD_MASK, 0);
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}
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static int tmp103_resume(struct device *dev)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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return regmap_update_bits(regmap, TMP103_CONF_REG,
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TMP103_CONF_SD_MASK, TMP103_CONF_SD);
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}
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static const struct dev_pm_ops tmp103_dev_pm_ops = {
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.suspend = tmp103_suspend,
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.resume = tmp103_resume,
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};
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#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
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#else
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#define TMP103_DEV_PM_OPS NULL
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#endif /* CONFIG_PM */
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static const struct i2c_device_id tmp103_id[] = {
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{ "tmp103", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tmp103_id);
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static struct i2c_driver tmp103_driver = {
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.driver = {
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.name = "tmp103",
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.pm = TMP103_DEV_PM_OPS,
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},
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.probe = tmp103_probe,
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.id_table = tmp103_id,
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};
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module_i2c_driver(tmp103_driver);
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MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
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MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
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MODULE_LICENSE("GPL");
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