| /* SPDX-License-Identifier: GPL-2.0-only */ |
| #ifndef _INPUT_MT_H |
| #define _INPUT_MT_H |
| |
| /* |
| * Input Multitouch Library |
| * |
| * Copyright (c) 2010 Henrik Rydberg |
| */ |
| |
| #include <linux/input.h> |
| |
| #define TRKID_MAX 0xffff |
| |
| #define INPUT_MT_POINTER 0x0001 /* pointer device, e.g. trackpad */ |
| #define INPUT_MT_DIRECT 0x0002 /* direct device, e.g. touchscreen */ |
| #define INPUT_MT_DROP_UNUSED 0x0004 /* drop contacts not seen in frame */ |
| #define INPUT_MT_TRACK 0x0008 /* use in-kernel tracking */ |
| #define INPUT_MT_SEMI_MT 0x0010 /* semi-mt device, finger count handled manually */ |
| |
| /** |
| * struct input_mt_slot - represents the state of an input MT slot |
| * @abs: holds current values of ABS_MT axes for this slot |
| * @frame: last frame at which input_mt_report_slot_state() was called |
| * @key: optional driver designation of this slot |
| */ |
| struct input_mt_slot { |
| int abs[ABS_MT_LAST - ABS_MT_FIRST + 1]; |
| unsigned int frame; |
| unsigned int key; |
| }; |
| |
| /** |
| * struct input_mt - state of tracked contacts |
| * @trkid: stores MT tracking ID for the next contact |
| * @num_slots: number of MT slots the device uses |
| * @slot: MT slot currently being transmitted |
| * @flags: input_mt operation flags |
| * @frame: increases every time input_mt_sync_frame() is called |
| * @red: reduced cost matrix for in-kernel tracking |
| * @slots: array of slots holding current values of tracked contacts |
| */ |
| struct input_mt { |
| int trkid; |
| int num_slots; |
| int slot; |
| unsigned int flags; |
| unsigned int frame; |
| int *red; |
| struct input_mt_slot slots[]; |
| }; |
| |
| static inline void input_mt_set_value(struct input_mt_slot *slot, |
| unsigned code, int value) |
| { |
| slot->abs[code - ABS_MT_FIRST] = value; |
| } |
| |
| static inline int input_mt_get_value(const struct input_mt_slot *slot, |
| unsigned code) |
| { |
| return slot->abs[code - ABS_MT_FIRST]; |
| } |
| |
| static inline bool input_mt_is_active(const struct input_mt_slot *slot) |
| { |
| return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0; |
| } |
| |
| static inline bool input_mt_is_used(const struct input_mt *mt, |
| const struct input_mt_slot *slot) |
| { |
| return slot->frame == mt->frame; |
| } |
| |
| int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots, |
| unsigned int flags); |
| void input_mt_destroy_slots(struct input_dev *dev); |
| |
| static inline int input_mt_new_trkid(struct input_mt *mt) |
| { |
| return mt->trkid++ & TRKID_MAX; |
| } |
| |
| static inline void input_mt_slot(struct input_dev *dev, int slot) |
| { |
| input_event(dev, EV_ABS, ABS_MT_SLOT, slot); |
| } |
| |
| static inline bool input_is_mt_value(int axis) |
| { |
| return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST; |
| } |
| |
| static inline bool input_is_mt_axis(int axis) |
| { |
| return axis == ABS_MT_SLOT || input_is_mt_value(axis); |
| } |
| |
| bool input_mt_report_slot_state(struct input_dev *dev, |
| unsigned int tool_type, bool active); |
| |
| static inline void input_mt_report_slot_inactive(struct input_dev *dev) |
| { |
| input_mt_report_slot_state(dev, 0, false); |
| } |
| |
| void input_mt_report_finger_count(struct input_dev *dev, int count); |
| void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); |
| void input_mt_drop_unused(struct input_dev *dev); |
| |
| void input_mt_sync_frame(struct input_dev *dev); |
| |
| /** |
| * struct input_mt_pos - contact position |
| * @x: horizontal coordinate |
| * @y: vertical coordinate |
| */ |
| struct input_mt_pos { |
| s16 x, y; |
| }; |
| |
| int input_mt_assign_slots(struct input_dev *dev, int *slots, |
| const struct input_mt_pos *pos, int num_pos, |
| int dmax); |
| |
| int input_mt_get_slot_by_key(struct input_dev *dev, int key); |
| |
| #endif |