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 
input_mt_set_value(struct input_mt_slot * slot,unsigned code,int value)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 
input_mt_get_value(const struct input_mt_slot * slot,unsigned code)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 
input_mt_is_active(const struct input_mt_slot * slot)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 
input_mt_is_used(const struct input_mt * mt,const struct input_mt_slot * slot)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 
input_mt_new_trkid(struct input_mt * mt)83 static inline int input_mt_new_trkid(struct input_mt *mt)
84 {
85 	return mt->trkid++ & TRKID_MAX;
86 }
87 
input_mt_slot(struct input_dev * dev,int slot)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 
input_is_mt_value(int axis)93 static inline bool input_is_mt_value(int axis)
94 {
95 	return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
96 }
97 
input_is_mt_axis(int axis)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 bool 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
128