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