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#define INPUT_MT_SEMI_MT	0x0010	/* semi-mt device, finger count handled manually */
23
24/**
25 * struct input_mt_slot - represents the state of an input MT slot
26 * @abs: holds current values of ABS_MT axes for this slot
27 * @frame: last frame at which input_mt_report_slot_state() was called
28 * @key: optional driver designation of this slot
29 */
30struct input_mt_slot {
31	int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
32	unsigned int frame;
33	unsigned int key;
34};
35
36/**
37 * struct input_mt - state of tracked contacts
38 * @trkid: stores MT tracking ID for the next contact
39 * @num_slots: number of MT slots the device uses
40 * @slot: MT slot currently being transmitted
41 * @flags: input_mt operation flags
42 * @frame: increases every time input_mt_sync_frame() is called
43 * @red: reduced cost matrix for in-kernel tracking
44 * @slots: array of slots holding current values of tracked contacts
45 */
46struct input_mt {
47	int trkid;
48	int num_slots;
49	int slot;
50	unsigned int flags;
51	unsigned int frame;
52	int *red;
53	struct input_mt_slot slots[];
54};
55
56static inline void input_mt_set_value(struct input_mt_slot *slot,
57				      unsigned code, int value)
58{
59	slot->abs[code - ABS_MT_FIRST] = value;
60}
61
62static inline int input_mt_get_value(const struct input_mt_slot *slot,
63				     unsigned code)
64{
65	return slot->abs[code - ABS_MT_FIRST];
66}
67
68static inline bool input_mt_is_active(const struct input_mt_slot *slot)
69{
70	return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0;
71}
72
73static inline bool input_mt_is_used(const struct input_mt *mt,
74				    const struct input_mt_slot *slot)
75{
76	return slot->frame == mt->frame;
77}
78
79int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
80			unsigned int flags);
81void input_mt_destroy_slots(struct input_dev *dev);
82
83static inline int input_mt_new_trkid(struct input_mt *mt)
84{
85	return mt->trkid++ & TRKID_MAX;
86}
87
88static inline void input_mt_slot(struct input_dev *dev, int slot)
89{
90	input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
91}
92
93static inline bool input_is_mt_value(int axis)
94{
95	return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
96}
97
98static inline bool input_is_mt_axis(int axis)
99{
100	return axis == ABS_MT_SLOT || input_is_mt_value(axis);
101}
102
103void input_mt_report_slot_state(struct input_dev *dev,
104				unsigned int tool_type, bool active);
105
106void input_mt_report_finger_count(struct input_dev *dev, int count);
107void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
108void input_mt_drop_unused(struct input_dev *dev);
109
110void input_mt_sync_frame(struct input_dev *dev);
111
112/**
113 * struct input_mt_pos - contact position
114 * @x: horizontal coordinate
115 * @y: vertical coordinate
116 */
117struct input_mt_pos {
118	s16 x, y;
119};
120
121int input_mt_assign_slots(struct input_dev *dev, int *slots,
122			  const struct input_mt_pos *pos, int num_pos);
123
124int input_mt_get_slot_by_key(struct input_dev *dev, int key);
125
126#endif
127