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1/*
2 * ntc_thermistor.h - NTC Thermistors
3 *
4 * Copyright (C) 2010 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#ifndef _LINUX_NTC_H
22#define _LINUX_NTC_H
23
24struct iio_channel;
25
26enum ntc_thermistor_type {
27 TYPE_NCPXXWB473,
28 TYPE_NCPXXWL333,
29};
30
31struct ntc_thermistor_platform_data {
32 /*
33 * One (not both) of read_uV and read_ohm should be provided and only
34 * one of the two should be provided.
35 * Both functions should return negative value for an error case.
36 *
37 * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required to use
38 * read_uV()
39 *
40 * How to setup pullup_ohm, pulldown_ohm, and connect is
41 * described at Documentation/hwmon/ntc_thermistor
42 *
43 * pullup/down_ohm: 0 for infinite / not-connected
44 *
45 * chan: iio_channel pointer to communicate with the ADC which the
46 * thermistor is using for conversion of the analog values.
47 */
48 int (*read_uv)(struct ntc_thermistor_platform_data *);
49 unsigned int pullup_uv;
50
51 unsigned int pullup_ohm;
52 unsigned int pulldown_ohm;
53 enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;
54 struct iio_channel *chan;
55
56 int (*read_ohm)(void);
57};
58
59#endif /* _LINUX_NTC_H */