include/linux/input/mt.h

   1 #ifndef _INPUT_MT_H
   2 #define _INPUT_MT_H
   3
   4 /*
   5  * Input Multitouch Library
   6  *
   7  * Copyright (c) 2010 Henrik Rydberg
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published by
  11  * the Free Software Foundation.
  12  */
  13
  14 #include <linux/input.h>
  15
  16 #define TRKID_MAX       0xffff
  17
  18 /**
  19  * struct input_mt_slot - represents the state of an input MT slot
  20  * @abs: holds current values of ABS_MT axes for this slot
  21  */
  22 struct input_mt_slot {
  23         int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
  24 };
  25
  26 static inline void input_mt_set_value(struct input_mt_slot *slot,
  27                                       unsigned code, int value)
  28 {
  29         slot->abs[code - ABS_MT_FIRST] = value;
  30 }
  31
  32 static inline int input_mt_get_value(const struct input_mt_slot *slot,
  33                                      unsigned code)
  34 {
  35         return slot->abs[code - ABS_MT_FIRST];
  36 }
  37
  38 int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots);
  39 void input_mt_destroy_slots(struct input_dev *dev);
  40
  41 static inline int input_mt_new_trkid(struct input_dev *dev)
  42 {
  43         return dev->trkid++ & TRKID_MAX;
  44 }
  45
  46 static inline void input_mt_slot(struct input_dev *dev, int slot)
  47 {
  48         input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
  49 }
  50
  51 static inline bool input_is_mt_axis(int axis)
  52 {
  53         return axis == ABS_MT_SLOT ||
  54                 (axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST);
  55 }
  56
  57 void input_mt_report_slot_state(struct input_dev *dev,
  58                                 unsigned int tool_type, bool active);
  59
  60 void input_mt_report_finger_count(struct input_dev *dev, int count);
  61 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
  62
  63 #endif