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 */
27struct 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 */
43struct 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[] __counted_by(num_slots);
51};
52
53static 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
59static 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
65static 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
70static 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
76int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
77			unsigned int flags);
78void input_mt_destroy_slots(struct input_dev *dev);
79
80static inline int input_mt_new_trkid(struct input_mt *mt)
81{
82	return mt->trkid++ & TRKID_MAX;
83}
84
85static inline void input_mt_slot(struct input_dev *dev, int slot)
86{
87	input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
88}
89
90static inline bool input_is_mt_value(int axis)
91{
92	return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
93}
94
95static inline bool input_is_mt_axis(int axis)
96{
97	return axis == ABS_MT_SLOT || input_is_mt_value(axis);
98}
99
100bool input_mt_report_slot_state(struct input_dev *dev,
101				unsigned int tool_type, bool active);
102
103static inline void input_mt_report_slot_inactive(struct input_dev *dev)
104{
105	input_mt_report_slot_state(dev, 0, false);
106}
107
108void input_mt_report_finger_count(struct input_dev *dev, int count);
109void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
110void input_mt_drop_unused(struct input_dev *dev);
111
112void 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 */
119struct input_mt_pos {
120	s16 x, y;
121};
122
123int input_mt_assign_slots(struct input_dev *dev, int *slots,
124			  const struct input_mt_pos *pos, int num_pos,
125			  int dmax);
126
127int input_mt_get_slot_by_key(struct input_dev *dev, int key);
128
129#endif
130