Line data    Source code

       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           0 : static inline void input_mt_set_value(struct input_mt_slot *slot,
      54             :                                       unsigned code, int value)
      55             : {
      56           0 :         slot->abs[code - ABS_MT_FIRST] = value;
      57             : }
      58             : 
      59           0 : static inline int input_mt_get_value(const struct input_mt_slot *slot,
      60             :                                      unsigned code)
      61             : {
      62           0 :         return slot->abs[code - ABS_MT_FIRST];
      63             : }
      64             : 
      65           0 : static inline bool input_mt_is_active(const struct input_mt_slot *slot)
      66             : {
      67           0 :         return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0;
      68             : }
      69             : 
      70           0 : static inline bool input_mt_is_used(const struct input_mt *mt,
      71             :                                     const struct input_mt_slot *slot)
      72             : {
      73           0 :         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           0 : static inline int input_mt_new_trkid(struct input_mt *mt)
      81             : {
      82           0 :         return mt->trkid++ & TRKID_MAX;
      83             : }
      84             : 
      85           0 : static inline void input_mt_slot(struct input_dev *dev, int slot)
      86             : {
      87           0 :         input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
      88             : }
      89             : 
      90           0 : static inline bool input_is_mt_value(int axis)
      91             : {
      92           0 :         return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
      93             : }
      94             : 
      95           0 : static inline bool input_is_mt_axis(int axis)
      96             : {
      97           0 :         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             : static inline void input_mt_report_slot_inactive(struct input_dev *dev)
     104             : {
     105             :         input_mt_report_slot_state(dev, 0, false);
     106             : }
     107             : 
     108             : void input_mt_report_finger_count(struct input_dev *dev, int count);
     109             : void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
     110             : void input_mt_drop_unused(struct input_dev *dev);
     111             : 
     112             : void 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             :  */
     119             : struct input_mt_pos {
     120             :         s16 x, y;
     121             : };
     122             : 
     123             : int input_mt_assign_slots(struct input_dev *dev, int *slots,
     124             :                           const struct input_mt_pos *pos, int num_pos,
     125             :                           int dmax);
     126             : 
     127             : int input_mt_get_slot_by_key(struct input_dev *dev, int key);
     128             : 
     129             : #endif