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306 lines
6.8 KiB
306 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2017 IBM Corp. |
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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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{ |
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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_new = 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 <[email protected]>"); |
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MODULE_DESCRIPTION("W83773G temperature sensor driver"); |
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MODULE_LICENSE("GPL");
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