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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits.h>
#include <linux/input.h>
#include <stddef.h>
#include <stdint.h>
#include <string>
#include <vector>
#include "base/component_export.h"
#include "base/macros.h"
#include "ui/events/devices/input_device.h"
#include "ui/events/ozone/evdev/event_device_util.h"
#if !defined(ABS_MT_TOOL_Y)
#define ABS_MT_TOOL_Y 0x3d
// ABS_MT_SLOT isn't valid options for EVIOCGMTSLOTS ioctl.
namespace base {
class FilePath;
namespace ui {
// Input device types.
enum COMPONENT_EXPORT(EVDEV) EventDeviceType {
// Device information for Linux input devices
// This stores and queries information about input devices; in
// particular it knows which events the device can generate.
class COMPONENT_EXPORT(EVDEV) EventDeviceInfo {
// Initialize device information from an open device.
bool Initialize(int fd, const base::FilePath& path);
// Manual initialization.
void SetEventTypes(const unsigned long* ev_bits, size_t len);
void SetKeyEvents(const unsigned long* key_bits, size_t len);
void SetRelEvents(const unsigned long* rel_bits, size_t len);
void SetAbsEvents(const unsigned long* abs_bits, size_t len);
void SetMscEvents(const unsigned long* msc_bits, size_t len);
void SetSwEvents(const unsigned long* sw_bits, size_t len);
void SetLedEvents(const unsigned long* led_bits, size_t len);
void SetProps(const unsigned long* prop_bits, size_t len);
void SetAbsInfo(unsigned int code, const input_absinfo& absinfo);
void SetAbsMtSlots(unsigned int code, const std::vector<int32_t>& values);
void SetAbsMtSlot(unsigned int code, unsigned int slot, uint32_t value);
void SetDeviceType(InputDeviceType type);
void SetId(input_id id);
void SetName(const std::string& name);
// Check events this device can generate.
bool HasEventType(unsigned int type) const;
bool HasKeyEvent(unsigned int code) const;
bool HasRelEvent(unsigned int code) const;
bool HasAbsEvent(unsigned int code) const;
bool HasMscEvent(unsigned int code) const;
bool HasSwEvent(unsigned int code) const;
bool HasLedEvent(unsigned int code) const;
// Properties of absolute axes.
int32_t GetAbsMinimum(unsigned int code) const;
int32_t GetAbsMaximum(unsigned int code) const;
int32_t GetAbsResolution(unsigned int code) const;
int32_t GetAbsValue(unsigned int code) const;
input_absinfo GetAbsInfoByCode(unsigned int code) const;
uint32_t GetAbsMtSlotCount() const;
int32_t GetAbsMtSlotValue(unsigned int code, unsigned int slot) const;
int32_t GetAbsMtSlotValueWithDefault(unsigned int code,
unsigned int slot,
int32_t default_value) const;
// Device identification.
const std::string& name() const { return name_; }
const std::string& phys() const { return phys_; }
uint16_t bustype() const { return input_id_.bustype; }
uint16_t vendor_id() const { return input_id_.vendor; }
uint16_t product_id() const { return input_id_.product; }
uint16_t version() const { return input_id_.version; }
// Check input device properties.
bool HasProp(unsigned int code) const;
// Has absolute X & Y axes (excludes MT)
bool HasAbsXY() const;
// Has MT absolute X & Y events.
bool HasMTAbsXY() const;
// Has relative X & Y axes.
bool HasRelXY() const;
// Has multitouch protocol "B".
bool HasMultitouch() const;
// Determine whether this is a "Direct Touch" device e.g. touchscreen.
// Corresponds to INPUT_PROP_DIRECT but may be inferred.
// NB: The Linux documentation says tablets would be direct, but they are
// not (and drivers do not actually set INPUT_PROP_DIRECT for them).
bool HasDirect() const;
// Determine whether device moves the cursor. This is the case for touchpads
// and tablets but not touchscreens.
// Corresponds to INPUT_PROP_POINTER but may be inferred.
bool HasPointer() const;
// Has stylus EV_KEY events.
bool HasStylus() const;
// Determine whether there's a keyboard on this device.
bool HasKeyboard() const;
// Determine whether there's a mouse on this device.
bool HasMouse() const;
// Determine whether there's a touchpad on this device.
bool HasTouchpad() const;
// Determine whether there's a tablet on this device.
bool HasTablet() const;
// Determine whether there's a touchscreen on this device.
bool HasTouchscreen() const;
// Determine whether there's a gamepad on this device.
bool HasGamepad() const;
// The device type (internal or external.)
InputDeviceType device_type() const { return device_type_; }
// Determines InputDeviceType from device identification.
static InputDeviceType GetInputDeviceTypeFromId(input_id id);
enum class LegacyAbsoluteDeviceType {
// Probe absolute X & Y axis behavior. This is for legacy drivers that
// do not tell us what the axes mean.
LegacyAbsoluteDeviceType ProbeLegacyAbsoluteDevice() const;
unsigned long ev_bits_[EVDEV_BITS_TO_LONGS(EV_CNT)];
unsigned long key_bits_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
unsigned long rel_bits_[EVDEV_BITS_TO_LONGS(REL_CNT)];
unsigned long abs_bits_[EVDEV_BITS_TO_LONGS(ABS_CNT)];
unsigned long msc_bits_[EVDEV_BITS_TO_LONGS(MSC_CNT)];
unsigned long sw_bits_[EVDEV_BITS_TO_LONGS(SW_CNT)];
unsigned long led_bits_[EVDEV_BITS_TO_LONGS(LED_CNT)];
unsigned long prop_bits_[EVDEV_BITS_TO_LONGS(INPUT_PROP_CNT)];
struct input_absinfo abs_info_[ABS_CNT];
// Store the values for the multi-touch properties for each slot.
std::vector<int32_t> slot_values_[EVDEV_ABS_MT_COUNT];
// Device identification.
std::string name_;
input_id input_id_ = {};
// Device evdev physical property containing the output for EVIOCGPHYS that is
// (supposed to be) stable between reboots and hotplugs.
std::string phys_;
// Whether this is an internal or external device.
InputDeviceType device_type_ = InputDeviceType::INPUT_DEVICE_UNKNOWN;
} // namspace ui