ui/events/ozone/evdev/event_device_info.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_
   6 #define UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_
   7
   8 #include <limits.h>
   9 #include <linux/input.h>
  10
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "ui/events/ozone/evdev/event_device_util.h"
  15 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  16
  17 // ABS_MT_SLOT isn't valid options for EVIOCGMTSLOTS ioctl.
  18 #define EVDEV_ABS_MT_COUNT (ABS_MAX - ABS_MT_SLOT - 1)
  19
  20 namespace ui {
  21
  22 // Input device types.
  23 enum EVENTS_OZONE_EVDEV_EXPORT EventDeviceType {
  24   DT_KEYBOARD,
  25   DT_MOUSE,
  26   DT_TOUCHPAD,
  27   DT_TOUCHSCREEN,
  28   DT_MULTITOUCH,
  29   DT_MULTITOUCH_MOUSE,
  30   DT_ALL,
  31 };
  32
  33 // Device information for Linux input devices
  34 //
  35 // This stores and queries information about input devices; in
  36 // particular it knows which events the device can generate.
  37 class EVENTS_OZONE_EVDEV_EXPORT EventDeviceInfo {
  38  public:
  39   EventDeviceInfo();
  40   ~EventDeviceInfo();
  41
  42   // Initialize device information from an open device.
  43   bool Initialize(int fd);
  44
  45   // Check events this device can generate.
  46   bool HasEventType(unsigned int type) const;
  47   bool HasKeyEvent(unsigned int code) const;
  48   bool HasRelEvent(unsigned int code) const;
  49   bool HasAbsEvent(unsigned int code) const;
  50   bool HasMscEvent(unsigned int code) const;
  51   bool HasSwEvent(unsigned int code) const;
  52   bool HasLedEvent(unsigned int code) const;
  53
  54   // Properties of absolute axes.
  55   int32 GetAbsMinimum(unsigned int code) const;
  56   int32 GetAbsMaximum(unsigned int code) const;
  57   int32 GetSlotValue(unsigned int code, unsigned int slot) const;
  58
  59   // Check input device properties.
  60   bool HasProp(unsigned int code) const;
  61
  62   // Has absolute X & Y axes (excludes MT)
  63   bool HasAbsXY() const;
  64
  65   // Has MT absolute events
  66   bool HasMTAbsXY() const;
  67
  68   // Has relative X & Y axes.
  69   bool HasRelXY() const;
  70
  71   // Determine whether absolute device X/Y coordinates are mapped onto the
  72   // screen. This is the case for touchscreens and tablets but not touchpads.
  73   bool IsMappedToScreen() const;
  74
  75   // Determine whether there's a keyboard on this device.
  76   bool HasKeyboard() const;
  77
  78   // Determine whether there's a mouse on this device.
  79   bool HasMouse() const;
  80
  81   // Determine whether there's a touchpad on this device.
  82   bool HasTouchpad() const;
  83
  84  private:
  85   // Return the slot vector in |slot_values_| for |code|.
  86   const std::vector<int32_t>& GetMtSlotsForCode(int code) const;
  87
  88   unsigned long ev_bits_[EVDEV_BITS_TO_LONGS(EV_CNT)];
  89   unsigned long key_bits_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
  90   unsigned long rel_bits_[EVDEV_BITS_TO_LONGS(REL_CNT)];
  91   unsigned long abs_bits_[EVDEV_BITS_TO_LONGS(ABS_CNT)];
  92   unsigned long msc_bits_[EVDEV_BITS_TO_LONGS(MSC_CNT)];
  93   unsigned long sw_bits_[EVDEV_BITS_TO_LONGS(SW_CNT)];
  94   unsigned long led_bits_[EVDEV_BITS_TO_LONGS(LED_CNT)];
  95   unsigned long prop_bits_[EVDEV_BITS_TO_LONGS(INPUT_PROP_CNT)];
  96
  97   struct input_absinfo abs_info_[ABS_CNT];
  98
  99   // Store the values for the multi-touch properties for each slot.
 100   std::vector<int32_t> slot_values_[EVDEV_ABS_MT_COUNT];
 101
 102   DISALLOW_COPY_AND_ASSIGN(EventDeviceInfo);
 103 };
 104
 105 }  // namspace ui
 106
 107 #endif  // UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_