Commit de34a405 authored by Alistair Francis's avatar Alistair Francis Committed by Lee Jones
Browse files

hwmon: sy7636a: Add temperature driver for sy7636a 



This is a multi-function device to interface with the sy7636a
EPD PMIC chip from Silergy.

Signed-off-by: default avatarAlistair Francis <alistair@alistair23.me>
Acked-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 947d0cce

Documentation/hwmon/index.rst

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@@ -185,6 +185,7 @@ Hardware Monitoring Kernel Drivers 
   smsc47m1

   sparx5-temp

   stpddc60

   sy7636a-hwmon

   tc654

   tc74

   thmc50

Documentation/hwmon/sy7636a-hwmon.rst

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.. SPDX-License-Identifier: GPL-2.0-or-later



Kernel driver sy7636a-hwmon

=========================



Supported chips:



 * Silergy SY7636A PMIC





Description

-----------



This driver adds hardware temperature reading support for

the Silergy SY7636A PMIC.



The following sensors are supported



  * Temperature

      - SoC on-die temperature in milli-degree C



sysfs-Interface

---------------



temp0_input

	- SoC on-die temperature (milli-degree C)

drivers/hwmon/Kconfig

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@@ -1672,6 +1672,15 @@ config SENSORS_SIS5595 
	  This driver can also be built as a module. If so, the module

	  will be called sis5595.



config SENSORS_SY7636A

	tristate "Silergy SY7636A"

	help

	  If you say yes here you get support for the thermistor readout of

	  the Silergy SY7636A PMIC.



	  This driver can also be built as a module.  If so, the module

	  will be called sy7636a-hwmon.



config SENSORS_DME1737

	tristate "SMSC DME1737, SCH311x and compatibles"

	depends on I2C && !PPC

drivers/hwmon/Makefile

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@@ -186,6 +186,7 @@ obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o 
obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o

obj-$(CONFIG_SENSORS_SPARX5)	+= sparx5-temp.o

obj-$(CONFIG_SENSORS_STTS751)	+= stts751.o

obj-$(CONFIG_SENSORS_SY7636A)	+= sy7636a-hwmon.o

obj-$(CONFIG_SENSORS_AMC6821)	+= amc6821.o

obj-$(CONFIG_SENSORS_TC74)	+= tc74.o

obj-$(CONFIG_SENSORS_THMC50)	+= thmc50.o

drivers/hwmon/sy7636a-hwmon.c

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// 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, &reg_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");