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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 */
30 struct 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 */
46 struct 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
56 static 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
62 static 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
68 static 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
73 static 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
79 int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
80 unsigned int flags);
81 void input_mt_destroy_slots(struct input_dev *dev);
82
83 static inline int input_mt_new_trkid(struct input_mt *mt)
84 {
85 return mt->trkid++ & TRKID_MAX;
86 }
87
88 static inline void input_mt_slot(struct input_dev *dev, int slot)
89 {
90 input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
91 }
92
93 static inline bool input_is_mt_value(int axis)
94 {
95 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
96 }
97
98 static inline bool input_is_mt_axis(int axis)
99 {
100 return axis == ABS_MT_SLOT || input_is_mt_value(axis);
101 }
102
103 void input_mt_report_slot_state(struct input_dev *dev,
104 unsigned int tool_type, bool active);
105
106 void input_mt_report_finger_count(struct input_dev *dev, int count);
107 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
108 void input_mt_drop_unused(struct input_dev *dev);
109
110 void 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 */
117 struct input_mt_pos {
118 s16 x, y;
119 };
120
121 int input_mt_assign_slots(struct input_dev *dev, int *slots,
122 const struct input_mt_pos *pos, int num_pos,
123 int dmax);
124
125 int input_mt_get_slot_by_key(struct input_dev *dev, int key);
126
127 #endif