events.h

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/* The industrial I/O - event passing to userspace
 *
 * Copyright (c) 2008-2011 Jonathan Cameron
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#ifndef _IIO_EVENTS_H_
#define _IIO_EVENTS_H_

#include <linux/ioctl.h>
#include <linux/types.h>
#include <linux/iio/types.h>

struct iio_event_data {
    __u64   id;
    __s64   timestamp;
};

#define IIO_GET_EVENT_FD_IOCTL _IOR('i', 0x90, int)

enum iio_event_type {
    IIO_EV_TYPE_THRESH,
    IIO_EV_TYPE_MAG,
    IIO_EV_TYPE_ROC,
    IIO_EV_TYPE_THRESH_ADAPTIVE,
    IIO_EV_TYPE_MAG_ADAPTIVE,
};

enum iio_event_direction {
    IIO_EV_DIR_EITHER,
    IIO_EV_DIR_RISING,
    IIO_EV_DIR_FALLING,
};

#define IIO_EVENT_CODE(chan_type, diff, modifier, direction,        \
               type, chan, chan1, chan2)            \
    (((u64)type << 56) | ((u64)diff << 55) |            \
     ((u64)direction << 48) | ((u64)modifier << 40) |       \
     ((u64)chan_type << 32) | (((u16)chan2) << 16) | ((u16)chan1) | \
     ((u16)chan))


#define IIO_EV_DIR_MAX 4
#define IIO_EV_BIT(type, direction)         \
    (1 << (type*IIO_EV_DIR_MAX + direction))

#define IIO_MOD_EVENT_CODE(chan_type, number, modifier,     \
               type, direction)             \
    IIO_EVENT_CODE(chan_type, 0, modifier, direction, type, number, 0, 0)

#define IIO_UNMOD_EVENT_CODE(chan_type, number, type, direction)    \
    IIO_EVENT_CODE(chan_type, 0, 0, direction, type, number, 0, 0)

#define IIO_EVENT_CODE_EXTRACT_TYPE(mask) ((mask >> 56) & 0xFF)

#define IIO_EVENT_CODE_EXTRACT_DIR(mask) ((mask >> 48) & 0xCF)

#define IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(mask) ((mask >> 32) & 0xFF)

/* Event code number extraction depends on which type of event we have.
 * Perhaps review this function in the future*/
#define IIO_EVENT_CODE_EXTRACT_CHAN(mask) ((__s16)(mask & 0xFFFF))
#define IIO_EVENT_CODE_EXTRACT_CHAN2(mask) ((__s16)(((mask) >> 16) & 0xFFFF))

#define IIO_EVENT_CODE_EXTRACT_MODIFIER(mask) ((mask >> 40) & 0xFF)
#define IIO_EVENT_CODE_EXTRACT_DIFF(mask) (((mask) >> 55) & 0x1)

#endif