cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mt.h (3455B)

      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 */
     27struct 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 */
     43struct 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
     53static 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
     59static 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
     65static 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
     70static 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
     76int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
     77			unsigned int flags);
     78void input_mt_destroy_slots(struct input_dev *dev);
     79
     80static inline int input_mt_new_trkid(struct input_mt *mt)
     81{
     82	return mt->trkid++ & TRKID_MAX;
     83}
     84
     85static inline void input_mt_slot(struct input_dev *dev, int slot)
     86{
     87	input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
     88}
     89
     90static inline bool input_is_mt_value(int axis)
     91{
     92	return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
     93}
     94
     95static inline bool input_is_mt_axis(int axis)
     96{
     97	return axis == ABS_MT_SLOT || input_is_mt_value(axis);
     98}
     99
    100bool input_mt_report_slot_state(struct input_dev *dev,
    101				unsigned int tool_type, bool active);
    102
    103static inline void input_mt_report_slot_inactive(struct input_dev *dev)
    104{
    105	input_mt_report_slot_state(dev, 0, false);
    106}
    107
    108void input_mt_report_finger_count(struct input_dev *dev, int count);
    109void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
    110void input_mt_drop_unused(struct input_dev *dev);
    111
    112void input_mt_sync_frame(struct input_dev *dev);
    113
    114/**
    115 * struct input_mt_pos - contact position
    116 * @x: horizontal coordinate
    117 * @y: vertical coordinate
    118 */
    119struct input_mt_pos {
    120	s16 x, y;
    121};
    122
    123int input_mt_assign_slots(struct input_dev *dev, int *slots,
    124			  const struct input_mt_pos *pos, int num_pos,
    125			  int dmax);
    126
    127int input_mt_get_slot_by_key(struct input_dev *dev, int key);
    128
    129#endif