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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (C) 2017 IBM Corp.
- *
- * 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 __maybe_unused 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, ®val);
- 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], ®val_high);
- if (ret < 0)
- return ret;
- ret = regmap_read(regmap, W83773_TEMP_LSB[index], ®val_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], ®val);
- 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], ®val_high);
- if (ret < 0)
- return ret;
- ret = regmap_read(regmap, W83773_OFFSET_LSB[index], ®val_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, ®val);
- 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 struct hwmon_channel_info *w83773_info[] = {
- HWMON_CHANNEL_INFO(chip,
- HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
- HWMON_CHANNEL_INFO(temp,
- HWMON_T_INPUT,
- HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET,
- HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET),
- 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)
- {
- 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_new = w83773_probe,
- .id_table = w83773_id,
- };
- module_i2c_driver(w83773_driver);
- MODULE_AUTHOR("Lei YU <[email protected]>");
- MODULE_DESCRIPTION("W83773G temperature sensor driver");
- MODULE_LICENSE("GPL");
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