linux-next/include/linux/platform_data/ntc_thermistor.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * ntc_thermistor.h - NTC Thermistors
 *
 *  Copyright (C) 2010 Samsung Electronics
 *  MyungJoo Ham <myungjoo.ham@samsung.com>
 */
#ifndef _LINUX_NTC_H
#define _LINUX_NTC_H

struct iio_channel;

enum ntc_thermistor_type {
	TYPE_B57330V2103,
	TYPE_B57891S0103,
	TYPE_NCPXXWB473,
	TYPE_NCPXXWF104,
	TYPE_NCPXXWL333,
	TYPE_NCPXXXH103,
};

struct ntc_thermistor_platform_data {
	/*
	 * One (not both) of read_uV and read_ohm should be provided and only
	 * one of the two should be provided.
	 * Both functions should return negative value for an error case.
	 *
	 * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required to use
	 * read_uV()
	 *
	 * How to setup pullup_ohm, pulldown_ohm, and connect is
	 * described at Documentation/hwmon/ntc_thermistor.rst
	 *
	 * pullup/down_ohm: 0 for infinite / not-connected
	 *
	 * chan: iio_channel pointer to communicate with the ADC which the
	 * thermistor is using for conversion of the analog values.
	 */
	int (*read_uv)(struct ntc_thermistor_platform_data *);
	unsigned int pullup_uv;

	unsigned int pullup_ohm;
	unsigned int pulldown_ohm;
	enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;
	struct iio_channel *chan;

	int (*read_ohm)(void);
};

#endif /* _LINUX_NTC_H */