LXR linux/include/linux/platform_data/ntc

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * ntc_thermistor.h - NTC Thermistors
   4 *
   5 *  Copyright (C) 2010 Samsung Electronics
   6 *  MyungJoo Ham <myungjoo.ham@samsung.com>
   7 */
   8#ifndef _LINUX_NTC_H
   9#define _LINUX_NTC_H
  10
  11struct iio_channel;
  12
  13enum ntc_thermistor_type {
  14        TYPE_B57330V2103,
  15        TYPE_B57891S0103,
  16        TYPE_NCPXXWB473,
  17        TYPE_NCPXXWF104,
  18        TYPE_NCPXXWL333,
  19        TYPE_NCPXXXH103,
  20};
  21
  22struct ntc_thermistor_platform_data {
  23        /*
  24         * One (not both) of read_uV and read_ohm should be provided and only
  25         * one of the two should be provided.
  26         * Both functions should return negative value for an error case.
  27         *
  28         * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required to use
  29         * read_uV()
  30         *
  31         * How to setup pullup_ohm, pulldown_ohm, and connect is
  32         * described at Documentation/hwmon/ntc_thermistor.rst
  33         *
  34         * pullup/down_ohm: 0 for infinite / not-connected
  35         *
  36         * chan: iio_channel pointer to communicate with the ADC which the
  37         * thermistor is using for conversion of the analog values.
  38         */
  39        int (*read_uv)(struct ntc_thermistor_platform_data *);
  40        unsigned int pullup_uv;
  41
  42        unsigned int pullup_ohm;
  43        unsigned int pulldown_ohm;
  44        enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;
  45        struct iio_channel *chan;
  46
  47        int (*read_ohm)(void);
  48};
  49
  50#endif /* _LINUX_NTC_H */
  51