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