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 24 struct iio_channel; 25 26 enum ntc_thermistor_type { 27 TYPE_NCPXXWB473, 28 TYPE_NCPXXWL333, 29 TYPE_B57330V2103, 30 TYPE_NCPXXWF104, 31 }; 32 33 struct ntc_thermistor_platform_data { 34 /* 35 * One (not both) of read_uV and read_ohm should be provided and only 36 * one of the two should be provided. 37 * Both functions should return negative value for an error case. 38 * 39 * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required to use 40 * read_uV() 41 * 42 * How to setup pullup_ohm, pulldown_ohm, and connect is 43 * described at Documentation/hwmon/ntc_thermistor 44 * 45 * pullup/down_ohm: 0 for infinite / not-connected 46 * 47 * chan: iio_channel pointer to communicate with the ADC which the 48 * thermistor is using for conversion of the analog values. 49 */ 50 int (*read_uv)(struct ntc_thermistor_platform_data *); 51 unsigned int pullup_uv; 52 53 unsigned int pullup_ohm; 54 unsigned int pulldown_ohm; 55 enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect; 56 struct iio_channel *chan; 57 58 int (*read_ohm)(void); 59 }; 60 61 #endif /* _LINUX_NTC_H */ 62