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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 {
InputDeviceType GetInputDeviceTypeFromPath(const base::FilePath& path) {
DCHECK(!base::MessageLoopForUI::IsCurrent());
std::string event_node = path.BaseName().value();
if (event_node.empty() || !StartsWithASCII(event_node, "event", false))
return InputDeviceType::INPUT_DEVICE_UNKNOWN;
// Find sysfs device path for this device.
base::FilePath sysfs_path =
base::FilePath(FILE_PATH_LITERAL("/sys/class/input"));
sysfs_path = sysfs_path.Append(path.BaseName());
sysfs_path = base::MakeAbsoluteFilePath(sysfs_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()) {
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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