/* 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