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// Copyright 2014 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 "ui/events/devices/device_util_linux.h"
#include <string>
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_util.h"
namespace ui {
base::FilePath GetInputPathInSys(const base::FilePath& path) {
return base::MakeAbsoluteFilePath(
base::FilePath("/sys/class/input").Append(path.BaseName()));
}
InputDeviceType GetInputDeviceTypeFromPath(const base::FilePath& path) {
DCHECK(!base::MessageLoopForUI::IsCurrent());
std::string event_node = path.BaseName().value();
if (event_node.empty() ||
!base::StartsWith(event_node, "event",
base::CompareCase::INSENSITIVE_ASCII))
return InputDeviceType::INPUT_DEVICE_UNKNOWN;
base::FilePath sysfs_path = GetInputPathInSys(path);
// Device does not exist.
if (sysfs_path.empty())
return InputDeviceType::INPUT_DEVICE_UNKNOWN;
// Check ancestor devices for a known bus attachment.
for (base::FilePath path = sysfs_path; path != base::FilePath("/");
path = path.DirName()) {
// Bluetooth LE devices are virtual "uhid" devices.
if (path ==
base::FilePath(FILE_PATH_LITERAL("/sys/devices/virtual/misc/uhid")))
return InputDeviceType::INPUT_DEVICE_EXTERNAL;
std::string subsystem_path =
base::MakeAbsoluteFilePath(path.Append(FILE_PATH_LITERAL("subsystem")))
.value();
if (subsystem_path.empty())
continue;
// Internal bus attachments.
if (subsystem_path == "/sys/bus/pci")
return InputDeviceType::INPUT_DEVICE_INTERNAL;
if (subsystem_path == "/sys/bus/i2c")
return InputDeviceType::INPUT_DEVICE_INTERNAL;
if (subsystem_path == "/sys/bus/acpi")
return InputDeviceType::INPUT_DEVICE_INTERNAL;
if (subsystem_path == "/sys/bus/serio")
return InputDeviceType::INPUT_DEVICE_INTERNAL;
if (subsystem_path == "/sys/bus/platform")
return InputDeviceType::INPUT_DEVICE_INTERNAL;
// External bus attachments.
if (subsystem_path == "/sys/bus/usb")
return InputDeviceType::INPUT_DEVICE_EXTERNAL;
if (subsystem_path == "/sys/class/bluetooth")
return InputDeviceType::INPUT_DEVICE_EXTERNAL;
}
return InputDeviceType::INPUT_DEVICE_UNKNOWN;
}
} // namespace
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