mt.h

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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _INPUT_MT_H
#define _INPUT_MT_H
 
/*
 * Input Multitouch Library
 *
 * Copyright (c) 2010 Henrik Rydberg
 */
 
#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 */
#define INPUT_MT_SEMI_MT    0x0010  /* semi-mt device, finger count handled manually */
#define INPUT_MT_TOTAL_FORCE    0x0020  /* calculate total force from slots pressure */
 
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[] __counted_by(num_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;
}
 
static inline bool input_mt_is_used(const struct input_mt *mt,
                    const struct input_mt_slot *slot)
{
    return slot->frame == mt->frame;
}
 
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);
}
 
bool input_mt_report_slot_state(struct input_dev *dev,
                unsigned int tool_type, bool active);
 
static inline void input_mt_report_slot_inactive(struct input_dev *dev)
{
    input_mt_report_slot_state(dev, 0, false);
}
 
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_drop_unused(struct input_dev *dev);
 
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 dmax);
 
int input_mt_get_slot_by_key(struct input_dev *dev, int key);
 
#endif