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      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 "base/basictypes.h"
     12 
     13 #define EVDEV_LONG_BITS (CHAR_BIT * sizeof(long))
     14 #define EVDEV_BITS_TO_LONGS(x) (((x) + EVDEV_LONG_BITS - 1) / EVDEV_LONG_BITS)
     15 
     16 namespace ui {
     17 
     18 // Device information for Linux input devices
     19 //
     20 // This stores and queries information about input devices; in
     21 // particular it knows which events the device can generate.
     22 class EventDeviceInfo {
     23  public:
     24   EventDeviceInfo();
     25   ~EventDeviceInfo();
     26 
     27   // Initialize device information from an open device.
     28   bool Initialize(int fd);
     29 
     30   // Check events this device can generate.
     31   bool HasEventType(unsigned int type) const;
     32   bool HasKeyEvent(unsigned int code) const;
     33   bool HasRelEvent(unsigned int code) const;
     34   bool HasAbsEvent(unsigned int code) const;
     35   bool HasMscEvent(unsigned int code) const;
     36   bool HasSwEvent(unsigned int code) const;
     37   bool HasLedEvent(unsigned int code) const;
     38 
     39   // Check input device properties.
     40   bool HasProp(unsigned int code) const;
     41 
     42  private:
     43   unsigned long ev_bits_[EVDEV_BITS_TO_LONGS(EV_CNT)];
     44   unsigned long key_bits_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
     45   unsigned long rel_bits_[EVDEV_BITS_TO_LONGS(REL_CNT)];
     46   unsigned long abs_bits_[EVDEV_BITS_TO_LONGS(ABS_CNT)];
     47   unsigned long msc_bits_[EVDEV_BITS_TO_LONGS(MSC_CNT)];
     48   unsigned long sw_bits_[EVDEV_BITS_TO_LONGS(SW_CNT)];
     49   unsigned long led_bits_[EVDEV_BITS_TO_LONGS(LED_CNT)];
     50   unsigned long prop_bits_[EVDEV_BITS_TO_LONGS(INPUT_PROP_CNT)];
     51 
     52   DISALLOW_COPY_AND_ASSIGN(EventDeviceInfo);
     53 };
     54 
     55 }  // namspace ui
     56 
     57 #endif  // UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_
     58