1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef _INPUT_MT_H 3 #define _INPUT_MT_H 4 5 /* 6 * Input Multitouch Library 7 * 8 * Copyright (c) 2010 Henrik Rydberg 9 */ 10 11 #include <linux/input.h> 12 13 #define TRKID_MAX 0xffff 14 15 #define INPUT_MT_POINTER 0x0001 /* pointer device, e.g. trackpad */ 16 #define INPUT_MT_DIRECT 0x0002 /* direct device, e.g. touchscreen */ 17 #define INPUT_MT_DROP_UNUSED 0x0004 /* drop contacts not seen in frame */ 18 #define INPUT_MT_TRACK 0x0008 /* use in-kernel tracking */ 19 #define INPUT_MT_SEMI_MT 0x0010 /* semi-mt device, finger count handled manually */ 20 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 * @key: optional driver designation of this slot 26 */ 27 struct input_mt_slot { 28 int abs[ABS_MT_LAST - ABS_MT_FIRST + 1]; 29 unsigned int frame; 30 unsigned int key; 31 }; 32 33 /** 34 * struct input_mt - state of tracked contacts 35 * @trkid: stores MT tracking ID for the next contact 36 * @num_slots: number of MT slots the device uses 37 * @slot: MT slot currently being transmitted 38 * @flags: input_mt operation flags 39 * @frame: increases every time input_mt_sync_frame() is called 40 * @red: reduced cost matrix for in-kernel tracking 41 * @slots: array of slots holding current values of tracked contacts 42 */ 43 struct input_mt { 44 int trkid; 45 int num_slots; 46 int slot; 47 unsigned int flags; 48 unsigned int frame; 49 int *red; 50 struct input_mt_slot slots[]; 51 }; 52 53 static inline void input_mt_set_value(struct input_mt_slot *slot, 54 unsigned code, int value) 55 { 56 slot->abs[code - ABS_MT_FIRST] = value; 57 } 58 59 static inline int input_mt_get_value(const struct input_mt_slot *slot, 60 unsigned code) 61 { 62 return slot->abs[code - ABS_MT_FIRST]; 63 } 64 65 static inline bool input_mt_is_active(const struct input_mt_slot *slot) 66 { 67 return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0; 68 } 69 70 static inline bool input_mt_is_used(const struct input_mt *mt, 71 const struct input_mt_slot *slot) 72 { 73 return slot->frame == mt->frame; 74 } 75 76 int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots, 77 unsigned int flags); 78 void input_mt_destroy_slots(struct input_dev *dev); 79 80 static inline int input_mt_new_trkid(struct input_mt *mt) 81 { 82 return mt->trkid++ & TRKID_MAX; 83 } 84 85 static inline void input_mt_slot(struct input_dev *dev, int slot) 86 { 87 input_event(dev, EV_ABS, ABS_MT_SLOT, slot); 88 } 89 90 static inline bool input_is_mt_value(int axis) 91 { 92 return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST; 93 } 94 95 static inline bool input_is_mt_axis(int axis) 96 { 97 return axis == ABS_MT_SLOT || input_is_mt_value(axis); 98 } 99 100 bool input_mt_report_slot_state(struct input_dev *dev, 101 unsigned int tool_type, bool active); 102 103 void input_mt_report_finger_count(struct input_dev *dev, int count); 104 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); 105 void input_mt_drop_unused(struct input_dev *dev); 106 107 void input_mt_sync_frame(struct input_dev *dev); 108 109 /** 110 * struct input_mt_pos - contact position 111 * @x: horizontal coordinate 112 * @y: vertical coordinate 113 */ 114 struct input_mt_pos { 115 s16 x, y; 116 }; 117 118 int input_mt_assign_slots(struct input_dev *dev, int *slots, 119 const struct input_mt_pos *pos, int num_pos, 120 int dmax); 121 122 int input_mt_get_slot_by_key(struct input_dev *dev, int key); 123 124 #endif 125