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 | |
21 | /** |
22 | * struct input_mt_slot - represents the state of an input MT slot |
23 | * @abs: holds current values of ABS_MT axes for this slot |
24 | * @frame: last frame at which input_mt_report_slot_state() was called |
25 | * @key: optional driver designation of this slot |
26 | */ |
27 | struct input_mt_slot { |
28 | int abs[ABS_MT_LAST - ABS_MT_FIRST + 1]; |
29 | unsigned int frame; |
30 | unsigned int key; |
31 | }; |
32 | |
33 | /** |
34 | * struct input_mt - state of tracked contacts |
35 | * @trkid: stores MT tracking ID for the next contact |
36 | * @num_slots: number of MT slots the device uses |
37 | * @slot: MT slot currently being transmitted |
38 | * @flags: input_mt operation flags |
39 | * @frame: increases every time input_mt_sync_frame() is called |
40 | * @red: reduced cost matrix for in-kernel tracking |
41 | * @slots: array of slots holding current values of tracked contacts |
42 | */ |
43 | struct input_mt { |
44 | int trkid; |
45 | int num_slots; |
46 | int slot; |
47 | unsigned int flags; |
48 | unsigned int frame; |
49 | int *red; |
50 | struct input_mt_slot slots[]; |
51 | }; |
52 | |
53 | static inline void input_mt_set_value(struct input_mt_slot *slot, |
54 | unsigned code, int value) |
55 | { |
56 | slot->abs[code - ABS_MT_FIRST] = value; |
57 | } |
58 | |
59 | static inline int input_mt_get_value(const struct input_mt_slot *slot, |
60 | unsigned code) |
61 | { |
62 | return slot->abs[code - ABS_MT_FIRST]; |
63 | } |
64 | |
65 | static inline bool input_mt_is_active(const struct input_mt_slot *slot) |
66 | { |
67 | return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0; |
68 | } |
69 | |
70 | static inline bool input_mt_is_used(const struct input_mt *mt, |
71 | const struct input_mt_slot *slot) |
72 | { |
73 | return slot->frame == mt->frame; |
74 | } |
75 | |
76 | int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots, |
77 | unsigned int flags); |
78 | void input_mt_destroy_slots(struct input_dev *dev); |
79 | |
80 | static inline int input_mt_new_trkid(struct input_mt *mt) |
81 | { |
82 | return mt->trkid++ & TRKID_MAX; |
83 | } |
84 | |
85 | static inline void input_mt_slot(struct input_dev *dev, int slot) |
86 | { |
87 | input_event(dev, EV_ABS, ABS_MT_SLOT, value: slot); |
88 | } |
89 | |
90 | static inline bool input_is_mt_value(int axis) |
91 | { |
92 | return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST; |
93 | } |
94 | |
95 | static inline bool input_is_mt_axis(int axis) |
96 | { |
97 | return axis == ABS_MT_SLOT || input_is_mt_value(axis); |
98 | } |
99 | |
100 | bool input_mt_report_slot_state(struct input_dev *dev, |
101 | unsigned int tool_type, bool active); |
102 | |
103 | static inline void input_mt_report_slot_inactive(struct input_dev *dev) |
104 | { |
105 | input_mt_report_slot_state(dev, tool_type: 0, active: false); |
106 | } |
107 | |
108 | void input_mt_report_finger_count(struct input_dev *dev, int count); |
109 | void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); |
110 | void input_mt_drop_unused(struct input_dev *dev); |
111 | |
112 | void input_mt_sync_frame(struct input_dev *dev); |
113 | |
114 | /** |
115 | * struct input_mt_pos - contact position |
116 | * @x: horizontal coordinate |
117 | * @y: vertical coordinate |
118 | */ |
119 | struct input_mt_pos { |
120 | s16 x, y; |
121 | }; |
122 | |
123 | int input_mt_assign_slots(struct input_dev *dev, int *slots, |
124 | const struct input_mt_pos *pos, int num_pos, |
125 | int dmax); |
126 | |
127 | int input_mt_get_slot_by_key(struct input_dev *dev, int key); |
128 | |
129 | #endif |
130 | |