312 lines
7.1 KiB
C
312 lines
7.1 KiB
C
/*
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* Copyright (C) 2017 IBM Corp.
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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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* Driver for the Nuvoton W83773G SMBus temperature sensor IC.
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* Supported models: W83773G
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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/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/of_device.h>
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#include <linux/regmap.h>
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/* W83773 has 3 channels */
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#define W83773_CHANNELS 3
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/* The W83773 registers */
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#define W83773_CONVERSION_RATE_REG_READ 0x04
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#define W83773_CONVERSION_RATE_REG_WRITE 0x0A
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#define W83773_MANUFACTURER_ID_REG 0xFE
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#define W83773_LOCAL_TEMP 0x00
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static const u8 W83773_STATUS[2] = { 0x02, 0x17 };
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static const u8 W83773_TEMP_LSB[2] = { 0x10, 0x25 };
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static const u8 W83773_TEMP_MSB[2] = { 0x01, 0x24 };
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static const u8 W83773_OFFSET_LSB[2] = { 0x12, 0x16 };
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static const u8 W83773_OFFSET_MSB[2] = { 0x11, 0x15 };
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/* this is the number of sensors in the device */
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static const struct i2c_device_id w83773_id[] = {
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{ "w83773g" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, w83773_id);
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static const struct of_device_id __maybe_unused w83773_of_match[] = {
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{
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.compatible = "nuvoton,w83773g"
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, w83773_of_match);
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static inline long temp_of_local(s8 reg)
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{
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return reg * 1000;
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}
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static inline long temp_of_remote(s8 hb, u8 lb)
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{
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return (hb << 3 | lb >> 5) * 125;
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}
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static int get_local_temp(struct regmap *regmap, long *val)
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{
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unsigned int regval;
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int ret;
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ret = regmap_read(regmap, W83773_LOCAL_TEMP, ®val);
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if (ret < 0)
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return ret;
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*val = temp_of_local(regval);
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return 0;
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}
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static int get_remote_temp(struct regmap *regmap, int index, long *val)
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{
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unsigned int regval_high;
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unsigned int regval_low;
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int ret;
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ret = regmap_read(regmap, W83773_TEMP_MSB[index], ®val_high);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, W83773_TEMP_LSB[index], ®val_low);
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if (ret < 0)
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return ret;
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*val = temp_of_remote(regval_high, regval_low);
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return 0;
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}
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static int get_fault(struct regmap *regmap, int index, long *val)
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{
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unsigned int regval;
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int ret;
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ret = regmap_read(regmap, W83773_STATUS[index], ®val);
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if (ret < 0)
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return ret;
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*val = (regval & 0x04) >> 2;
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return 0;
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}
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static int get_offset(struct regmap *regmap, int index, long *val)
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{
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unsigned int regval_high;
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unsigned int regval_low;
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int ret;
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ret = regmap_read(regmap, W83773_OFFSET_MSB[index], ®val_high);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, W83773_OFFSET_LSB[index], ®val_low);
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if (ret < 0)
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return ret;
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*val = temp_of_remote(regval_high, regval_low);
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return 0;
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}
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static int set_offset(struct regmap *regmap, int index, long val)
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{
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int ret;
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u8 high_byte;
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u8 low_byte;
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val = clamp_val(val, -127825, 127825);
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/* offset value equals to (high_byte << 3 | low_byte >> 5) * 125 */
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val /= 125;
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high_byte = val >> 3;
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low_byte = (val & 0x07) << 5;
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ret = regmap_write(regmap, W83773_OFFSET_MSB[index], high_byte);
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if (ret < 0)
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return ret;
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return regmap_write(regmap, W83773_OFFSET_LSB[index], low_byte);
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}
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static int get_update_interval(struct regmap *regmap, long *val)
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{
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unsigned int regval;
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int ret;
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ret = regmap_read(regmap, W83773_CONVERSION_RATE_REG_READ, ®val);
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if (ret < 0)
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return ret;
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*val = 16000 >> regval;
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return 0;
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}
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static int set_update_interval(struct regmap *regmap, long val)
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{
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int rate;
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/*
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* For valid rates, interval can be calculated as
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* interval = (1 << (8 - rate)) * 62.5;
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* Rounded rate is therefore
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* rate = 8 - __fls(interval * 8 / (62.5 * 7));
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* Use clamp_val() to avoid overflows, and to ensure valid input
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* for __fls.
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*/
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val = clamp_val(val, 62, 16000) * 10;
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rate = 8 - __fls((val * 8 / (625 * 7)));
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return regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, rate);
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}
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static int w83773_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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if (type == hwmon_chip) {
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if (attr == hwmon_chip_update_interval)
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return get_update_interval(regmap, val);
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return -EOPNOTSUPP;
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}
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switch (attr) {
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case hwmon_temp_input:
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if (channel == 0)
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return get_local_temp(regmap, val);
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return get_remote_temp(regmap, channel - 1, val);
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case hwmon_temp_fault:
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return get_fault(regmap, channel - 1, val);
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case hwmon_temp_offset:
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return get_offset(regmap, channel - 1, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int w83773_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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if (type == hwmon_chip && attr == hwmon_chip_update_interval)
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return set_update_interval(regmap, val);
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if (type == hwmon_temp && attr == hwmon_temp_offset)
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return set_offset(regmap, channel - 1, val);
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return -EOPNOTSUPP;
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}
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static umode_t w83773_is_visible(const void *data, enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (type) {
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case hwmon_chip:
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switch (attr) {
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case hwmon_chip_update_interval:
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return 0644;
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}
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break;
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_input:
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case hwmon_temp_fault:
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return 0444;
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case hwmon_temp_offset:
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return 0644;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static const struct hwmon_channel_info *w83773_info[] = {
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HWMON_CHANNEL_INFO(chip,
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HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT,
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HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET,
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HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET),
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NULL
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};
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static const struct hwmon_ops w83773_ops = {
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.is_visible = w83773_is_visible,
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.read = w83773_read,
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.write = w83773_write,
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};
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static const struct hwmon_chip_info w83773_chip_info = {
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.ops = &w83773_ops,
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.info = w83773_info,
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};
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static const struct regmap_config w83773_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int w83773_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, &w83773_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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/* Set the conversion rate to 2 Hz */
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ret = regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, 0x05);
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if (ret < 0) {
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dev_err(&client->dev, "error writing config rate 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 = devm_hwmon_device_register_with_info(dev,
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client->name,
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regmap,
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&w83773_chip_info,
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NULL);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static struct i2c_driver w83773_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "w83773g",
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.of_match_table = of_match_ptr(w83773_of_match),
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},
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.probe = w83773_probe,
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.id_table = w83773_id,
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};
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module_i2c_driver(w83773_driver);
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MODULE_AUTHOR("Lei YU <mine260309@gmail.com>");
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MODULE_DESCRIPTION("W83773G temperature sensor driver");
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MODULE_LICENSE("GPL");
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