| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | #ifndef _INPUT_MT_H |
| 3 | #define _INPUT_MT_H |
| 4 | |
| 5 | /* |
| 6 | * Input Multitouch Library |
| 7 | * |
| 8 | * Copyright (c) 2010 Henrik Rydberg |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |