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
input_mt_set_value(struct input_mt_slot * slot,unsigned code,int value)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
input_mt_get_value(const struct input_mt_slot * slot,unsigned code)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
input_mt_is_active(const struct input_mt_slot * slot)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
input_mt_is_used(const struct input_mt * mt,const struct input_mt_slot * slot)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
input_mt_new_trkid(struct input_mt * mt)80 static inline int input_mt_new_trkid(struct input_mt *mt)
81 {
82 return mt->trkid++ & TRKID_MAX;
83 }
84
input_mt_slot(struct input_dev * dev,int slot)85 static inline void input_mt_slot(struct input_dev *dev, int slot)
86 {
87 input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
88 }
89
input_is_mt_value(int axis)90 static inline bool input_is_mt_value(int axis)
91 {
92 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
93 }
94
input_is_mt_axis(int axis)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 void input_mt_report_finger_count(struct input_dev *dev, int count);
104 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
105 void input_mt_drop_unused(struct input_dev *dev);
106
107 void input_mt_sync_frame(struct input_dev *dev);
108
109 /**
110 * struct input_mt_pos - contact position
111 * @x: horizontal coordinate
112 * @y: vertical coordinate
113 */
114 struct input_mt_pos {
115 s16 x, y;
116 };
117
118 int input_mt_assign_slots(struct input_dev *dev, int *slots,
119 const struct input_mt_pos *pos, int num_pos,
120 int dmax);
121
122 int input_mt_get_slot_by_key(struct input_dev *dev, int key);
123
124 #endif
125
