Commit 8ba44710 authored by Jeff LaBundy's avatar Jeff LaBundy Committed by Lee Jones
Browse files

iio: temperature: Add support for Azoteq IQS620AT temperature sensor 



This patch adds support for the Azoteq IQS620AT temperature sensor,
capable of reporting its absolute die temperature.

Signed-off-by: default avatarJeff LaBundy <jeff@labundy.com>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent ce1cb0ee

drivers/iio/temperature/Kconfig

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@@ -4,6 +4,16 @@ 
#

menu "Temperature sensors"



config IQS620AT_TEMP

	tristate "Azoteq IQS620AT temperature sensor"

	depends on MFD_IQS62X || COMPILE_TEST

	help

	  Say Y here if you want to build support for the Azoteq IQS620AT

	  temperature sensor.



	  To compile this driver as a module, choose M here: the module

	  will be called iqs620at-temp.



config LTC2983

	tristate "Analog Devices Multi-Sensor Digital Temperature Measurement System"

	depends on SPI

drivers/iio/temperature/Makefile

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# Makefile for industrial I/O temperature drivers

#



obj-$(CONFIG_IQS620AT_TEMP) += iqs620at-temp.o

obj-$(CONFIG_LTC2983) += ltc2983.o

obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o

obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o

drivers/iio/temperature/iqs620at-temp.c

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// SPDX-License-Identifier: GPL-2.0+

/*

 * Azoteq IQS620AT Temperature Sensor

 *

 * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>

 */



#include <linux/device.h>

#include <linux/iio/iio.h>

#include <linux/kernel.h>

#include <linux/mfd/iqs62x.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>



#define IQS620_TEMP_UI_OUT			0x1A



#define IQS620_TEMP_SCALE			1000

#define IQS620_TEMP_OFFSET			(-100)



static int iqs620_temp_read_raw(struct iio_dev *indio_dev,

				struct iio_chan_spec const *chan,

				int *val, int *val2, long mask)

{

	struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);

	int ret;

	__le16 val_buf;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,

				      &val_buf, sizeof(val_buf));

		if (ret)

			return ret;



		*val = le16_to_cpu(val_buf);

		return IIO_VAL_INT;



	case IIO_CHAN_INFO_SCALE:

		*val = IQS620_TEMP_SCALE;

		return IIO_VAL_INT;



	case IIO_CHAN_INFO_OFFSET:

		*val = IQS620_TEMP_OFFSET;

		return IIO_VAL_INT;



	default:

		return -EINVAL;

	}

}



static const struct iio_info iqs620_temp_info = {

	.read_raw = &iqs620_temp_read_raw,

};



static const struct iio_chan_spec iqs620_temp_channels[] = {

	{

		.type = IIO_TEMP,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

				      BIT(IIO_CHAN_INFO_SCALE) |

				      BIT(IIO_CHAN_INFO_OFFSET),

	},

};



static int iqs620_temp_probe(struct platform_device *pdev)

{

	struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);

	struct iio_dev *indio_dev;



	indio_dev = devm_iio_device_alloc(&pdev->dev, 0);

	if (!indio_dev)

		return -ENOMEM;



	iio_device_set_drvdata(indio_dev, iqs62x);



	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->dev.parent = &pdev->dev;

	indio_dev->channels = iqs620_temp_channels;

	indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);

	indio_dev->name = iqs62x->dev_desc->dev_name;

	indio_dev->info = &iqs620_temp_info;



	return devm_iio_device_register(&pdev->dev, indio_dev);

}



static struct platform_driver iqs620_temp_platform_driver = {

	.driver = {

		.name = "iqs620at-temp",

	},

	.probe = iqs620_temp_probe,

};

module_platform_driver(iqs620_temp_platform_driver);



MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");

MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:iqs620at-temp");