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 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h" 13 14 #define EVDEV_LONG_BITS (CHAR_BIT * sizeof(long)) 15 #define EVDEV_BITS_TO_LONGS(x) (((x) + EVDEV_LONG_BITS - 1) / EVDEV_LONG_BITS) 16 17 namespace ui { 18 19 // Device information for Linux input devices 20 // 21 // This stores and queries information about input devices; in 22 // particular it knows which events the device can generate. 23 class EVENTS_OZONE_EVDEV_EXPORT EventDeviceInfo { 24 public: 25 EventDeviceInfo(); 26 ~EventDeviceInfo(); 27 28 // Initialize device information from an open device. 29 bool Initialize(int fd); 30 31 // Check events this device can generate. 32 bool HasEventType(unsigned int type) const; 33 bool HasKeyEvent(unsigned int code) const; 34 bool HasRelEvent(unsigned int code) const; 35 bool HasAbsEvent(unsigned int code) const; 36 bool HasMscEvent(unsigned int code) const; 37 bool HasSwEvent(unsigned int code) const; 38 bool HasLedEvent(unsigned int code) const; 39 40 // Properties of absolute axes. 41 int32 GetAbsMinimum(unsigned int code) const; 42 int32 GetAbsMaximum(unsigned int code) const; 43 44 // Check input device properties. 45 bool HasProp(unsigned int code) const; 46 47 // Has absolute X & Y axes. 48 bool HasAbsXY() const; 49 50 // Has relativeX & Y axes. 51 bool HasRelXY() const; 52 53 // Determine whether absolute device X/Y coordinates are mapped onto the 54 // screen. This is the case for touchscreens and tablets but not touchpads. 55 bool IsMappedToScreen() const; 56 57 private: 58 unsigned long ev_bits_[EVDEV_BITS_TO_LONGS(EV_CNT)]; 59 unsigned long key_bits_[EVDEV_BITS_TO_LONGS(KEY_CNT)]; 60 unsigned long rel_bits_[EVDEV_BITS_TO_LONGS(REL_CNT)]; 61 unsigned long abs_bits_[EVDEV_BITS_TO_LONGS(ABS_CNT)]; 62 unsigned long msc_bits_[EVDEV_BITS_TO_LONGS(MSC_CNT)]; 63 unsigned long sw_bits_[EVDEV_BITS_TO_LONGS(SW_CNT)]; 64 unsigned long led_bits_[EVDEV_BITS_TO_LONGS(LED_CNT)]; 65 unsigned long prop_bits_[EVDEV_BITS_TO_LONGS(INPUT_PROP_CNT)]; 66 67 struct input_absinfo abs_info_[ABS_CNT]; 68 69 DISALLOW_COPY_AND_ASSIGN(EventDeviceInfo); 70 }; 71 72 } // namspace ui 73 74 #endif // UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_ 75