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