106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
|
|
* Functions to access SY3686A power management chip temperature
|
|
*
|
|
* Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/
|
|
*
|
|
* Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
|
|
*
|
|
* 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 version 2.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/mfd/sy7636a.h>
|
|
|
|
struct sy7636a_data {
|
|
struct sy7636a *sy7636a;
|
|
struct device *hwmon_dev;
|
|
};
|
|
|
|
static ssize_t show_temp(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
unsigned int reg_val;
|
|
signed char temp;
|
|
int ret;
|
|
struct sy7636a_data *data = dev_get_drvdata(dev);
|
|
|
|
ret = regmap_read(data->sy7636a->regmap,
|
|
SY7636A_REG_TERMISTOR_READOUT, ®_val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
temp = *((signed char*)®_val);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", temp);
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp0, S_IRUGO, show_temp, NULL, 0);
|
|
|
|
static struct attribute *sy7636a_attrs[] = {
|
|
&sensor_dev_attr_temp0.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(sy7636a);
|
|
|
|
static int sy7636a_sensor_probe(struct platform_device *pdev)
|
|
{
|
|
struct sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent);
|
|
struct sy7636a_data *data;
|
|
int err;
|
|
|
|
if (!sy7636a)
|
|
return -EPROBE_DEFER;
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL);
|
|
if (!data) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
data->sy7636a = sy7636a;
|
|
data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
|
|
"sy7636a_temperature", data, sy7636a_groups);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
dev_err(&pdev->dev, "Unable to register hwmon device, returned %d", err);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id sy7636a_sensor_id[] = {
|
|
{ "sy7636a-temperature", 0},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, sy7636a_sensor_id);
|
|
|
|
static struct platform_driver sy7636a_sensor_driver = {
|
|
.probe = sy7636a_sensor_probe,
|
|
.id_table = sy7636a_sensor_id,
|
|
.driver = {
|
|
.name = "sy7636a-temperature",
|
|
},
|
|
};
|
|
module_platform_driver(sy7636a_sensor_driver);
|
|
|
|
MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>");
|
|
MODULE_DESCRIPTION("Silergy SY7636A Sensor Driver");
|
|
MODULE_LICENSE("GPL v2");
|