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 128