107 строки
2.4 KiB
C
107 строки
2.4 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* Functions to access SY3686A power management chip temperature
|
||
|
|
*
|
||
|
|
* Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
|
||
|
|
*
|
||
|
|
* Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
|
||
|
|
* Alistair Francis <alistair@alistair23.me>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/hwmon.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/regmap.h>
|
||
|
|
#include <linux/regulator/machine.h>
|
||
|
|
|
||
|
|
#include <linux/mfd/sy7636a.h>
|
||
|
|
|
||
|
|
static int sy7636a_read(struct device *dev, enum hwmon_sensor_types type,
|
||
|
|
u32 attr, int channel, long *temp)
|
||
|
|
{
|
||
|
|
struct regmap *regmap = dev_get_drvdata(dev);
|
||
|
|
int ret, reg_val;
|
||
|
|
|
||
|
|
ret = regmap_read(regmap,
|
||
|
|
SY7636A_REG_TERMISTOR_READOUT, ®_val);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
*temp = reg_val * 1000;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static umode_t sy7636a_is_visible(const void *data,
|
||
|
|
enum hwmon_sensor_types type,
|
||
|
|
u32 attr, int channel)
|
||
|
|
{
|
||
|
|
if (type != hwmon_temp)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (attr != hwmon_temp_input)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 0444;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct hwmon_ops sy7636a_hwmon_ops = {
|
||
|
|
.is_visible = sy7636a_is_visible,
|
||
|
|
.read = sy7636a_read,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct hwmon_channel_info *sy7636a_info[] = {
|
||
|
|
HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
|
||
|
|
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct hwmon_chip_info sy7636a_chip_info = {
|
||
|
|
.ops = &sy7636a_hwmon_ops,
|
||
|
|
.info = sy7636a_info,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int sy7636a_sensor_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
||
|
|
struct regulator *regulator;
|
||
|
|
struct device *hwmon_dev;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
if (!regmap)
|
||
|
|
return -EPROBE_DEFER;
|
||
|
|
|
||
|
|
regulator = devm_regulator_get(&pdev->dev, "vcom");
|
||
|
|
if (IS_ERR(regulator))
|
||
|
|
return PTR_ERR(regulator);
|
||
|
|
|
||
|
|
err = regulator_enable(regulator);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
|
||
|
|
"sy7636a_temperature", regmap,
|
||
|
|
&sy7636a_chip_info, NULL);
|
||
|
|
|
||
|
|
if (IS_ERR(hwmon_dev)) {
|
||
|
|
err = PTR_ERR(hwmon_dev);
|
||
|
|
dev_err(&pdev->dev, "Unable to register hwmon device, returned %d\n", err);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver sy7636a_sensor_driver = {
|
||
|
|
.probe = sy7636a_sensor_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "sy7636a-temperature",
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(sy7636a_sensor_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("SY7636A sensor driver");
|
||
|
|
MODULE_LICENSE("GPL");
|