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 /** 19 * struct input_mt_slot - represents the state of an input MT slot 20 * @abs: holds current values of ABS_MT axes for this slot 21 */ 22 struct input_mt_slot { 23 int abs[ABS_MT_LAST - ABS_MT_FIRST + 1]; 24 }; 25 26 /** 27 * struct input_mt - state of tracked contacts 28 * @trkid: stores MT tracking ID for the next contact 29 * @num_slots: number of MT slots the device uses 30 * @slot: MT slot currently being transmitted 31 * @slots: array of slots holding current values of tracked contacts 32 */ 33 struct input_mt { 34 int trkid; 35 int num_slots; 36 int slot; 37 struct input_mt_slot slots[]; 38 }; 39 40 static inline void input_mt_set_value(struct input_mt_slot *slot, 41 unsigned code, int value) 42 { 43 slot->abs[code - ABS_MT_FIRST] = value; 44 } 45 46 static inline int input_mt_get_value(const struct input_mt_slot *slot, 47 unsigned code) 48 { 49 return slot->abs[code - ABS_MT_FIRST]; 50 } 51 52 int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots); 53 void input_mt_destroy_slots(struct input_dev *dev); 54 55 static inline int input_mt_new_trkid(struct input_mt *mt) 56 { 57 return mt->trkid++ & TRKID_MAX; 58 } 59 60 static inline void input_mt_slot(struct input_dev *dev, int slot) 61 { 62 input_event(dev, EV_ABS, ABS_MT_SLOT, slot); 63 } 64 65 static inline bool input_is_mt_value(int axis) 66 { 67 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST; 68 } 69 70 static inline bool input_is_mt_axis(int axis) 71 { 72 return axis == ABS_MT_SLOT || input_is_mt_value(axis); 73 } 74 75 void input_mt_report_slot_state(struct input_dev *dev, 76 unsigned int tool_type, bool active); 77 78 void input_mt_report_finger_count(struct input_dev *dev, int count); 79 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); 80 81 #endif 82