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 /** 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 */ 26 struct input_mt_slot { 27 int abs[ABS_MT_LAST - ABS_MT_FIRST + 1]; 28 unsigned int frame; 29 }; 30 31 /** 32 * struct input_mt - state of tracked contacts 33 * @trkid: stores MT tracking ID for the next contact 34 * @num_slots: number of MT slots the device uses 35 * @slot: MT slot currently being transmitted 36 * @flags: input_mt operation flags 37 * @frame: increases every time input_mt_sync_frame() is called 38 * @slots: array of slots holding current values of tracked contacts 39 */ 40 struct input_mt { 41 int trkid; 42 int num_slots; 43 int slot; 44 unsigned int flags; 45 unsigned int frame; 46 struct input_mt_slot slots[]; 47 }; 48 49 static inline void input_mt_set_value(struct input_mt_slot *slot, 50 unsigned code, int value) 51 { 52 slot->abs[code - ABS_MT_FIRST] = value; 53 } 54 55 static inline int input_mt_get_value(const struct input_mt_slot *slot, 56 unsigned code) 57 { 58 return slot->abs[code - ABS_MT_FIRST]; 59 } 60 61 int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots, 62 unsigned int flags); 63 void input_mt_destroy_slots(struct input_dev *dev); 64 65 static inline int input_mt_new_trkid(struct input_mt *mt) 66 { 67 return mt->trkid++ & TRKID_MAX; 68 } 69 70 static inline void input_mt_slot(struct input_dev *dev, int slot) 71 { 72 input_event(dev, EV_ABS, ABS_MT_SLOT, slot); 73 } 74 75 static inline bool input_is_mt_value(int axis) 76 { 77 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST; 78 } 79 80 static inline bool input_is_mt_axis(int axis) 81 { 82 return axis == ABS_MT_SLOT || input_is_mt_value(axis); 83 } 84 85 void input_mt_report_slot_state(struct input_dev *dev, 86 unsigned int tool_type, bool active); 87 88 void input_mt_report_finger_count(struct input_dev *dev, int count); 89 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); 90 91 void input_mt_sync_frame(struct input_dev *dev); 92 93 #endif 94