mt.h

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#ifndef _INPUT_MT_H
#define _INPUT_MT_H

/*
 * Input Multitouch Library
 *
 * Copyright (c) 2010 Henrik Rydberg
 *
 * 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.
 */

#include <linux/input.h>

#define TRKID_MAX   0xffff

#define INPUT_MT_POINTER    0x0001  /* pointer device, e.g. trackpad */
#define INPUT_MT_DIRECT     0x0002  /* direct device, e.g. touchscreen */
#define INPUT_MT_DROP_UNUSED    0x0004  /* drop contacts not seen in frame */
#define INPUT_MT_TRACK      0x0008  /* use in-kernel tracking */

struct input_mt_slot {
    int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
    unsigned int frame;
    unsigned int key;
};

struct input_mt {
    int trkid;
    int num_slots;
    int slot;
    unsigned int flags;
    unsigned int frame;
    int *red;
    struct input_mt_slot slots[];
};

static inline void input_mt_set_value(struct input_mt_slot *slot,
                      unsigned code, int value)
{
    slot->abs[code - ABS_MT_FIRST] = value;
}

static inline int input_mt_get_value(const struct input_mt_slot *slot,
                     unsigned code)
{
    return slot->abs[code - ABS_MT_FIRST];
}

static inline bool input_mt_is_active(const struct input_mt_slot *slot)
{
    return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0;
}

int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
            unsigned int flags);
void input_mt_destroy_slots(struct input_dev *dev);

static inline int input_mt_new_trkid(struct input_mt *mt)
{
    return mt->trkid++ & TRKID_MAX;
}

static inline void input_mt_slot(struct input_dev *dev, int slot)
{
    input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
}

static inline bool input_is_mt_value(int axis)
{
    return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
}

static inline bool input_is_mt_axis(int axis)
{
    return axis == ABS_MT_SLOT || input_is_mt_value(axis);
}

void input_mt_report_slot_state(struct input_dev *dev,
                unsigned int tool_type, bool active);

void input_mt_report_finger_count(struct input_dev *dev, int count);
void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);

void input_mt_sync_frame(struct input_dev *dev);

struct input_mt_pos {
    s16 x, y;
};

int input_mt_assign_slots(struct input_dev *dev, int *slots,
              const struct input_mt_pos *pos, int num_pos);

int input_mt_get_slot_by_key(struct input_dev *dev, int key);

#endif