src/kernel/linux/v4.19/drivers/hwmon/w83773g.c - T800 - Gitiles

 /*
  * Copyright (C) 2017 IBM Corp.
  *
  * 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.
  *
  * Driver for the Nuvoton W83773G SMBus temperature sensor IC.
  * Supported models: W83773G
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>

 /* W83773 has 3 channels */
 #define W83773_CHANNELS				3

 /* The W83773 registers */
 #define W83773_CONVERSION_RATE_REG_READ		0x04
 #define W83773_CONVERSION_RATE_REG_WRITE	0x0A
 #define W83773_MANUFACTURER_ID_REG		0xFE
 #define W83773_LOCAL_TEMP			0x00

 static const u8 W83773_STATUS[2] = { 0x02, 0x17 };

 static const u8 W83773_TEMP_LSB[2] = { 0x10, 0x25 };
 static const u8 W83773_TEMP_MSB[2] = { 0x01, 0x24 };

 static const u8 W83773_OFFSET_LSB[2] = { 0x12, 0x16 };
 static const u8 W83773_OFFSET_MSB[2] = { 0x11, 0x15 };

 /* this is the number of sensors in the device */
 static const struct i2c_device_id w83773_id[] = {
 	{ "w83773g" },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, w83773_id);

 static const struct of_device_id w83773_of_match[] = {
 	{
 		.compatible = "nuvoton,w83773g"
 	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, w83773_of_match);

 static inline long temp_of_local(s8 reg)
 {
 	return reg * 1000;
 }

 static inline long temp_of_remote(s8 hb, u8 lb)
 {
 	return (hb << 3 | lb >> 5) * 125;
 }

 static int get_local_temp(struct regmap *regmap, long *val)
 {
 	unsigned int regval;
 	int ret;

 	ret = regmap_read(regmap, W83773_LOCAL_TEMP, &regval);
 	if (ret < 0)
 		return ret;

 	*val = temp_of_local(regval);
 	return 0;
 }

 static int get_remote_temp(struct regmap *regmap, int index, long *val)
 {
 	unsigned int regval_high;
 	unsigned int regval_low;
 	int ret;

 	ret = regmap_read(regmap, W83773_TEMP_MSB[index], &regval_high);
 	if (ret < 0)
 		return ret;

 	ret = regmap_read(regmap, W83773_TEMP_LSB[index], &regval_low);
 	if (ret < 0)
 		return ret;

 	*val = temp_of_remote(regval_high, regval_low);
 	return 0;
 }

 static int get_fault(struct regmap *regmap, int index, long *val)
 {
 	unsigned int regval;
 	int ret;

 	ret = regmap_read(regmap, W83773_STATUS[index], &regval);
 	if (ret < 0)
 		return ret;

 	*val = (regval & 0x04) >> 2;
 	return 0;
 }

 static int get_offset(struct regmap *regmap, int index, long *val)
 {
 	unsigned int regval_high;
 	unsigned int regval_low;
 	int ret;

 	ret = regmap_read(regmap, W83773_OFFSET_MSB[index], &regval_high);
 	if (ret < 0)
 		return ret;

 	ret = regmap_read(regmap, W83773_OFFSET_LSB[index], &regval_low);
 	if (ret < 0)
 		return ret;

 	*val = temp_of_remote(regval_high, regval_low);
 	return 0;
 }

 static int set_offset(struct regmap *regmap, int index, long val)
 {
 	int ret;
 	u8 high_byte;
 	u8 low_byte;

 	val = clamp_val(val, -127825, 127825);
 	/* offset value equals to (high_byte << 3 | low_byte >> 5) * 125 */
 	val /= 125;
 	high_byte = val >> 3;
 	low_byte = (val & 0x07) << 5;

 	ret = regmap_write(regmap, W83773_OFFSET_MSB[index], high_byte);
 	if (ret < 0)
 		return ret;

 	return regmap_write(regmap, W83773_OFFSET_LSB[index], low_byte);
 }

 static int get_update_interval(struct regmap *regmap, long *val)
 {
 	unsigned int regval;
 	int ret;

 	ret = regmap_read(regmap, W83773_CONVERSION_RATE_REG_READ, &regval);
 	if (ret < 0)
 		return ret;

 	*val = 16000 >> regval;
 	return 0;
 }

 static int set_update_interval(struct regmap *regmap, long val)
 {
 	int rate;

 	/*
 	 * For valid rates, interval can be calculated as
 	 *	interval = (1 << (8 - rate)) * 62.5;
 	 * Rounded rate is therefore
 	 *	rate = 8 - __fls(interval * 8 / (62.5 * 7));
 	 * Use clamp_val() to avoid overflows, and to ensure valid input
 	 * for __fls.
 	 */
 	val = clamp_val(val, 62, 16000) * 10;
 	rate = 8 - __fls((val * 8 / (625 * 7)));
 	return regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, rate);
 }

 static int w83773_read(struct device *dev, enum hwmon_sensor_types type,
 		       u32 attr, int channel, long *val)
 {
 	struct regmap *regmap = dev_get_drvdata(dev);

 	if (type == hwmon_chip) {
 		if (attr == hwmon_chip_update_interval)
 			return get_update_interval(regmap, val);
 		return -EOPNOTSUPP;
 	}

 	switch (attr) {
 	case hwmon_temp_input:
 		if (channel == 0)
 			return get_local_temp(regmap, val);
 		return get_remote_temp(regmap, channel - 1, val);
 	case hwmon_temp_fault:
 		return get_fault(regmap, channel - 1, val);
 	case hwmon_temp_offset:
 		return get_offset(regmap, channel - 1, val);
 	default:
 		return -EOPNOTSUPP;
 	}
 }

 static int w83773_write(struct device *dev, enum hwmon_sensor_types type,
 			u32 attr, int channel, long val)
 {
 	struct regmap *regmap = dev_get_drvdata(dev);

 	if (type == hwmon_chip && attr == hwmon_chip_update_interval)
 		return set_update_interval(regmap, val);

 	if (type == hwmon_temp && attr == hwmon_temp_offset)
 		return set_offset(regmap, channel - 1, val);

 	return -EOPNOTSUPP;
 }

 static umode_t w83773_is_visible(const void *data, enum hwmon_sensor_types type,
 				 u32 attr, int channel)
 {
 	switch (type) {
 	case hwmon_chip:
 		switch (attr) {
 		case hwmon_chip_update_interval:
 			return 0644;
 		}
 		break;
 	case hwmon_temp:
 		switch (attr) {
 		case hwmon_temp_input:
 		case hwmon_temp_fault:
 			return 0444;
 		case hwmon_temp_offset:
 			return 0644;
 		}
 		break;
 	default:
 		break;
 	}
 	return 0;
 }

 static const u32 w83773_chip_config[] = {
 	HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL,
 	0
 };

 static const struct hwmon_channel_info w83773_chip = {
 	.type = hwmon_chip,
 	.config = w83773_chip_config,
 };

 static const u32 w83773_temp_config[] = {
 	HWMON_T_INPUT,
 	HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET,
 	HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET,
 	0
 };

 static const struct hwmon_channel_info w83773_temp = {
 	.type = hwmon_temp,
 	.config = w83773_temp_config,
 };

 static const struct hwmon_channel_info *w83773_info[] = {
 	&w83773_chip,
 	&w83773_temp,
 	NULL
 };

 static const struct hwmon_ops w83773_ops = {
 	.is_visible = w83773_is_visible,
 	.read = w83773_read,
 	.write = w83773_write,
 };

 static const struct hwmon_chip_info w83773_chip_info = {
 	.ops = &w83773_ops,
 	.info = w83773_info,
 };

 static const struct regmap_config w83773_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int w83773_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;

 	regmap = devm_regmap_init_i2c(client, &w83773_regmap_config);
 	if (IS_ERR(regmap)) {
 		dev_err(dev, "failed to allocate register map\n");
 		return PTR_ERR(regmap);
 	}

 	/* Set the conversion rate to 2 Hz */
 	ret = regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, 0x05);
 	if (ret < 0) {
 		dev_err(&client->dev, "error writing config rate register\n");
 		return ret;
 	}

 	i2c_set_clientdata(client, regmap);

 	hwmon_dev = devm_hwmon_device_register_with_info(dev,
 							 client->name,
 							 regmap,
 							 &w83773_chip_info,
 							 NULL);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 static struct i2c_driver w83773_driver = {
 	.class = I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "w83773g",
 		.of_match_table = of_match_ptr(w83773_of_match),
 	},
 	.probe = w83773_probe,
 	.id_table = w83773_id,
 };

 module_i2c_driver(w83773_driver);

 MODULE_AUTHOR("Lei YU <mine260309@gmail.com>");
 MODULE_DESCRIPTION("W83773G temperature sensor driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2017 IBM Corp.
	*
	* 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.
	*
	* Driver for the Nuvoton W83773G SMBus temperature sensor IC.
	* Supported models: W83773G
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/i2c.h>
	#include <linux/hwmon.h>
	#include <linux/hwmon-sysfs.h>
	#include <linux/err.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>

	/* W83773 has 3 channels */
	#define W83773_CHANNELS 3

	/* The W83773 registers */
	#define W83773_CONVERSION_RATE_REG_READ 0x04
	#define W83773_CONVERSION_RATE_REG_WRITE 0x0A
	#define W83773_MANUFACTURER_ID_REG 0xFE
	#define W83773_LOCAL_TEMP 0x00

	static const u8 W83773_STATUS[2] = { 0x02, 0x17 };

	static const u8 W83773_TEMP_LSB[2] = { 0x10, 0x25 };
	static const u8 W83773_TEMP_MSB[2] = { 0x01, 0x24 };

	static const u8 W83773_OFFSET_LSB[2] = { 0x12, 0x16 };
	static const u8 W83773_OFFSET_MSB[2] = { 0x11, 0x15 };

	/* this is the number of sensors in the device */
	static const struct i2c_device_id w83773_id[] = {
	{ "w83773g" },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, w83773_id);

	static const struct of_device_id w83773_of_match[] = {
	{
	.compatible = "nuvoton,w83773g"
	},
	{ },
	};
	MODULE_DEVICE_TABLE(of, w83773_of_match);

	static inline long temp_of_local(s8 reg)
	{
	return reg * 1000;
	}

	static inline long temp_of_remote(s8 hb, u8 lb)
	{
	return (hb << 3 \| lb >> 5) * 125;
	}

	static int get_local_temp(struct regmap regmap, long val)
	{
	unsigned int regval;
	int ret;

	ret = regmap_read(regmap, W83773_LOCAL_TEMP, &regval);
	if (ret < 0)
	return ret;

	*val = temp_of_local(regval);
	return 0;
	}

	static int get_remote_temp(struct regmap regmap, int index, long val)
	{
	unsigned int regval_high;
	unsigned int regval_low;
	int ret;

	ret = regmap_read(regmap, W83773_TEMP_MSB[index], &regval_high);
	if (ret < 0)
	return ret;

	ret = regmap_read(regmap, W83773_TEMP_LSB[index], &regval_low);
	if (ret < 0)
	return ret;

	*val = temp_of_remote(regval_high, regval_low);
	return 0;
	}

	static int get_fault(struct regmap regmap, int index, long val)
	{
	unsigned int regval;
	int ret;

	ret = regmap_read(regmap, W83773_STATUS[index], &regval);
	if (ret < 0)
	return ret;

	*val = (regval & 0x04) >> 2;
	return 0;
	}

	static int get_offset(struct regmap regmap, int index, long val)
	{
	unsigned int regval_high;
	unsigned int regval_low;
	int ret;

	ret = regmap_read(regmap, W83773_OFFSET_MSB[index], &regval_high);
	if (ret < 0)
	return ret;

	ret = regmap_read(regmap, W83773_OFFSET_LSB[index], &regval_low);
	if (ret < 0)
	return ret;

	*val = temp_of_remote(regval_high, regval_low);
	return 0;
	}

	static int set_offset(struct regmap *regmap, int index, long val)
	{
	int ret;
	u8 high_byte;
	u8 low_byte;

	val = clamp_val(val, -127825, 127825);
	/* offset value equals to (high_byte << 3 \| low_byte >> 5) * 125 */
	val /= 125;
	high_byte = val >> 3;
	low_byte = (val & 0x07) << 5;

	ret = regmap_write(regmap, W83773_OFFSET_MSB[index], high_byte);
	if (ret < 0)
	return ret;

	return regmap_write(regmap, W83773_OFFSET_LSB[index], low_byte);
	}

	static int get_update_interval(struct regmap regmap, long val)
	{
	unsigned int regval;
	int ret;

	ret = regmap_read(regmap, W83773_CONVERSION_RATE_REG_READ, &regval);
	if (ret < 0)
	return ret;

	*val = 16000 >> regval;
	return 0;
	}

	static int set_update_interval(struct regmap *regmap, long val)
	{
	int rate;

	/*
	* For valid rates, interval can be calculated as
	* interval = (1 << (8 - rate)) * 62.5;
	* Rounded rate is therefore
	* rate = 8 - __fls(interval * 8 / (62.5 * 7));
	* Use clamp_val() to avoid overflows, and to ensure valid input
	* for __fls.
	*/
	val = clamp_val(val, 62, 16000) * 10;
	rate = 8 - __fls((val * 8 / (625 * 7)));
	return regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, rate);
	}

	static int w83773_read(struct device *dev, enum hwmon_sensor_types type,
	u32 attr, int channel, long *val)
	{
	struct regmap *regmap = dev_get_drvdata(dev);

	if (type == hwmon_chip) {
	if (attr == hwmon_chip_update_interval)
	return get_update_interval(regmap, val);
	return -EOPNOTSUPP;
	}

	switch (attr) {
	case hwmon_temp_input:
	if (channel == 0)
	return get_local_temp(regmap, val);
	return get_remote_temp(regmap, channel - 1, val);
	case hwmon_temp_fault:
	return get_fault(regmap, channel - 1, val);
	case hwmon_temp_offset:
	return get_offset(regmap, channel - 1, val);
	default:
	return -EOPNOTSUPP;
	}
	}

	static int w83773_write(struct device *dev, enum hwmon_sensor_types type,
	u32 attr, int channel, long val)
	{
	struct regmap *regmap = dev_get_drvdata(dev);

	if (type == hwmon_chip && attr == hwmon_chip_update_interval)
	return set_update_interval(regmap, val);

	if (type == hwmon_temp && attr == hwmon_temp_offset)
	return set_offset(regmap, channel - 1, val);

	return -EOPNOTSUPP;
	}

	static umode_t w83773_is_visible(const void *data, enum hwmon_sensor_types type,
	u32 attr, int channel)
	{
	switch (type) {
	case hwmon_chip:
	switch (attr) {
	case hwmon_chip_update_interval:
	return 0644;
	}
	break;
	case hwmon_temp:
	switch (attr) {
	case hwmon_temp_input:
	case hwmon_temp_fault:
	return 0444;
	case hwmon_temp_offset:
	return 0644;
	}
	break;
	default:
	break;
	}
	return 0;
	}

	static const u32 w83773_chip_config[] = {
	HWMON_C_REGISTER_TZ \| HWMON_C_UPDATE_INTERVAL,
	0
	};

	static const struct hwmon_channel_info w83773_chip = {
	.type = hwmon_chip,
	.config = w83773_chip_config,
	};

	static const u32 w83773_temp_config[] = {
	HWMON_T_INPUT,
	HWMON_T_INPUT \| HWMON_T_FAULT \| HWMON_T_OFFSET,
	HWMON_T_INPUT \| HWMON_T_FAULT \| HWMON_T_OFFSET,
	0
	};

	static const struct hwmon_channel_info w83773_temp = {
	.type = hwmon_temp,
	.config = w83773_temp_config,
	};

	static const struct hwmon_channel_info *w83773_info[] = {
	&w83773_chip,
	&w83773_temp,
	NULL
	};

	static const struct hwmon_ops w83773_ops = {
	.is_visible = w83773_is_visible,
	.read = w83773_read,
	.write = w83773_write,
	};

	static const struct hwmon_chip_info w83773_chip_info = {
	.ops = &w83773_ops,
	.info = w83773_info,
	};

	static const struct regmap_config w83773_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int w83773_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;

	regmap = devm_regmap_init_i2c(client, &w83773_regmap_config);
	if (IS_ERR(regmap)) {
	dev_err(dev, "failed to allocate register map\n");
	return PTR_ERR(regmap);
	}

	/* Set the conversion rate to 2 Hz */
	ret = regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, 0x05);
	if (ret < 0) {
	dev_err(&client->dev, "error writing config rate register\n");
	return ret;
	}

	i2c_set_clientdata(client, regmap);

	hwmon_dev = devm_hwmon_device_register_with_info(dev,
	client->name,
	regmap,
	&w83773_chip_info,
	NULL);
	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	static struct i2c_driver w83773_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
	.name = "w83773g",
	.of_match_table = of_match_ptr(w83773_of_match),
	},
	.probe = w83773_probe,
	.id_table = w83773_id,
	};

	module_i2c_driver(w83773_driver);

	MODULE_AUTHOR("Lei YU <mine260309@gmail.com>");
	MODULE_DESCRIPTION("W83773G temperature sensor driver");
	MODULE_LICENSE("GPL");