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linux/drivers/hwmon/w83773g.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function 
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

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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, &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 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 <mine260309@gmail.com>");
MODULE_DESCRIPTION("W83773G temperature sensor driver");
MODULE_LICENSE("GPL");
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