1 /* The industrial I/O - event passing to userspace 2 * 3 * Copyright (c) 2008-2011 Jonathan Cameron 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 */ 9 #ifndef _IIO_EVENTS_H_ 10 #define _IIO_EVENTS_H_ 11 12 #include <linux/ioctl.h> 13 #include <linux/types.h> 14 #include <linux/iio/types.h> 15 16 /** 17 * struct iio_event_data - The actual event being pushed to userspace 18 * @id: event identifier 19 * @timestamp: best estimate of time of event occurrence (often from 20 * the interrupt handler) 21 */ 22 struct iio_event_data { 23 __u64 id; 24 __s64 timestamp; 25 }; 26 27 #define IIO_GET_EVENT_FD_IOCTL _IOR('i', 0x90, int) 28 29 /** 30 * IIO_EVENT_CODE() - create event identifier 31 * @chan_type: Type of the channel. Should be one of enum iio_chan_type. 32 * @diff: Whether the event is for an differential channel or not. 33 * @modifier: Modifier for the channel. Should be one of enum iio_modifier. 34 * @direction: Direction of the event. One of enum iio_event_direction. 35 * @type: Type of the event. Should be one of enum iio_event_type. 36 * @chan: Channel number for non-differential channels. 37 * @chan1: First channel number for differential channels. 38 * @chan2: Second channel number for differential channels. 39 */ 40 41 #define IIO_EVENT_CODE(chan_type, diff, modifier, direction, \ 42 type, chan, chan1, chan2) \ 43 (((u64)type << 56) | ((u64)diff << 55) | \ 44 ((u64)direction << 48) | ((u64)modifier << 40) | \ 45 ((u64)chan_type << 32) | (((u16)chan2) << 16) | ((u16)chan1) | \ 46 ((u16)chan)) 47 48 49 /** 50 * IIO_MOD_EVENT_CODE() - create event identifier for modified channels 51 * @chan_type: Type of the channel. Should be one of enum iio_chan_type. 52 * @number: Channel number. 53 * @modifier: Modifier for the channel. Should be one of enum iio_modifier. 54 * @type: Type of the event. Should be one of enum iio_event_type. 55 * @direction: Direction of the event. One of enum iio_event_direction. 56 */ 57 58 #define IIO_MOD_EVENT_CODE(chan_type, number, modifier, \ 59 type, direction) \ 60 IIO_EVENT_CODE(chan_type, 0, modifier, direction, type, number, 0, 0) 61 62 /** 63 * IIO_UNMOD_EVENT_CODE() - create event identifier for unmodified channels 64 * @chan_type: Type of the channel. Should be one of enum iio_chan_type. 65 * @number: Channel number. 66 * @type: Type of the event. Should be one of enum iio_event_type. 67 * @direction: Direction of the event. One of enum iio_event_direction. 68 */ 69 70 #define IIO_UNMOD_EVENT_CODE(chan_type, number, type, direction) \ 71 IIO_EVENT_CODE(chan_type, 0, 0, direction, type, number, 0, 0) 72 73 #define IIO_EVENT_CODE_EXTRACT_TYPE(mask) ((mask >> 56) & 0xFF) 74 75 #define IIO_EVENT_CODE_EXTRACT_DIR(mask) ((mask >> 48) & 0xCF) 76 77 #define IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(mask) ((mask >> 32) & 0xFF) 78 79 /* Event code number extraction depends on which type of event we have. 80 * Perhaps review this function in the future*/ 81 #define IIO_EVENT_CODE_EXTRACT_CHAN(mask) ((__s16)(mask & 0xFFFF)) 82 #define IIO_EVENT_CODE_EXTRACT_CHAN2(mask) ((__s16)(((mask) >> 16) & 0xFFFF)) 83 84 #define IIO_EVENT_CODE_EXTRACT_MODIFIER(mask) ((mask >> 40) & 0xFF) 85 #define IIO_EVENT_CODE_EXTRACT_DIFF(mask) (((mask) >> 55) & 0x1) 86 87 #endif 88