Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2#ifndef _INPUT_MT_H
3#define _INPUT_MT_H
4
5/*
6 * Input Multitouch Library
7 *
8 * Copyright (c) 2010 Henrik Rydberg
9 */
10
11#include <linux/input.h>
12
13#define TRKID_MAX 0xffff
14
15#define INPUT_MT_POINTER 0x0001 /* pointer device, e.g. trackpad */
16#define INPUT_MT_DIRECT 0x0002 /* direct device, e.g. touchscreen */
17#define INPUT_MT_DROP_UNUSED 0x0004 /* drop contacts not seen in frame */
18#define INPUT_MT_TRACK 0x0008 /* use in-kernel tracking */
19#define INPUT_MT_SEMI_MT 0x0010 /* semi-mt device, finger count handled manually */
20#define INPUT_MT_TOTAL_FORCE 0x0020 /* calculate total force from slots pressure */
21
22/**
23 * struct input_mt_slot - represents the state of an input MT slot
24 * @abs: holds current values of ABS_MT axes for this slot
25 * @frame: last frame at which input_mt_report_slot_state() was called
26 * @key: optional driver designation of this slot
27 */
28struct input_mt_slot {
29 int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
30 unsigned int frame;
31 unsigned int key;
32};
33
34/**
35 * struct input_mt - state of tracked contacts
36 * @trkid: stores MT tracking ID for the next contact
37 * @num_slots: number of MT slots the device uses
38 * @slot: MT slot currently being transmitted
39 * @flags: input_mt operation flags
40 * @frame: increases every time input_mt_sync_frame() is called
41 * @red: reduced cost matrix for in-kernel tracking
42 * @slots: array of slots holding current values of tracked contacts
43 */
44struct input_mt {
45 int trkid;
46 int num_slots;
47 int slot;
48 unsigned int flags;
49 unsigned int frame;
50 int *red;
51 struct input_mt_slot slots[] __counted_by(num_slots);
52};
53
54static inline void input_mt_set_value(struct input_mt_slot *slot,
55 unsigned code, int value)
56{
57 slot->abs[code - ABS_MT_FIRST] = value;
58}
59
60static inline int input_mt_get_value(const struct input_mt_slot *slot,
61 unsigned code)
62{
63 return slot->abs[code - ABS_MT_FIRST];
64}
65
66static inline bool input_mt_is_active(const struct input_mt_slot *slot)
67{
68 return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0;
69}
70
71static inline bool input_mt_is_used(const struct input_mt *mt,
72 const struct input_mt_slot *slot)
73{
74 return slot->frame == mt->frame;
75}
76
77int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
78 unsigned int flags);
79void input_mt_destroy_slots(struct input_dev *dev);
80
81static inline int input_mt_new_trkid(struct input_mt *mt)
82{
83 return mt->trkid++ & TRKID_MAX;
84}
85
86static inline void input_mt_slot(struct input_dev *dev, int slot)
87{
88 input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
89}
90
91static inline bool input_is_mt_value(int axis)
92{
93 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
94}
95
96static inline bool input_is_mt_axis(int axis)
97{
98 return axis == ABS_MT_SLOT || input_is_mt_value(axis);
99}
100
101bool input_mt_report_slot_state(struct input_dev *dev,
102 unsigned int tool_type, bool active);
103
104static inline void input_mt_report_slot_inactive(struct input_dev *dev)
105{
106 input_mt_report_slot_state(dev, 0, false);
107}
108
109void input_mt_report_finger_count(struct input_dev *dev, int count);
110void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
111void input_mt_drop_unused(struct input_dev *dev);
112
113void input_mt_sync_frame(struct input_dev *dev);
114
115/**
116 * struct input_mt_pos - contact position
117 * @x: horizontal coordinate
118 * @y: vertical coordinate
119 */
120struct input_mt_pos {
121 s16 x, y;
122};
123
124int input_mt_assign_slots(struct input_dev *dev, int *slots,
125 const struct input_mt_pos *pos, int num_pos,
126 int dmax);
127
128int input_mt_get_slot_by_key(struct input_dev *dev, int key);
129
130#endif