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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 "device/hid/hid_service_linux.h"
#include <string>
#include "base/bind.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/thread_restrictions.h"
#include "device/hid/hid_connection_linux.h"
#include "device/hid/hid_device_info.h"
#include "device/hid/hid_report_descriptor.h"
#include "device/udev_linux/scoped_udev.h"
#if defined(OS_CHROMEOS)
#include "base/sys_info.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/permission_broker_client.h"
#endif // defined(OS_CHROMEOS)
namespace device {
namespace {
const char kHidrawSubsystem[] = "hidraw";
const char kHIDID[] = "HID_ID";
const char kHIDName[] = "HID_NAME";
const char kHIDUnique[] = "HID_UNIQ";
const char kSysfsReportDescriptorKey[] = "report_descriptor";
#if defined(OS_CHROMEOS)
void OnRequestAccessComplete(
scoped_refptr<base::SingleThreadTaskRunner> reply_task_runner,
const base::Callback<void(bool success)>& callback,
bool success) {
reply_task_runner->PostTask(FROM_HERE, base::Bind(callback, success));
}
void RequestAccess(
const std::string& device_node,
scoped_refptr<base::SingleThreadTaskRunner> reply_task_runner,
const base::Callback<void(bool success)>& callback) {
bool success = false;
if (base::SysInfo::IsRunningOnChromeOS()) {
chromeos::PermissionBrokerClient* client =
chromeos::DBusThreadManager::Get()->GetPermissionBrokerClient();
DCHECK(client) << "Could not get permission broker client.";
if (client) {
client->RequestPathAccess(
device_node,
-1,
base::Bind(OnRequestAccessComplete, reply_task_runner, callback));
return;
}
} else {
// Not really running on Chrome OS, declare success.
success = true;
}
reply_task_runner->PostTask(FROM_HERE, base::Bind(callback, success));
}
#endif
} // namespace
HidServiceLinux::HidServiceLinux(
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner)
: ui_task_runner_(ui_task_runner),
weak_factory_(this) {
base::ThreadRestrictions::AssertIOAllowed();
task_runner_ = base::ThreadTaskRunnerHandle::Get();
DeviceMonitorLinux* monitor = DeviceMonitorLinux::GetInstance();
monitor->AddObserver(this);
monitor->Enumerate(
base::Bind(&HidServiceLinux::OnDeviceAdded, weak_factory_.GetWeakPtr()));
}
void HidServiceLinux::Connect(const HidDeviceId& device_id,
const ConnectCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
ScopedUdevDevicePtr device =
DeviceMonitorLinux::GetInstance()->GetDeviceFromPath(
device_id);
if (!device) {
task_runner_->PostTask(FROM_HERE, base::Bind(callback, nullptr));
return;
}
const char* device_node = udev_device_get_devnode(device.get());
if (!device_node) {
task_runner_->PostTask(FROM_HERE, base::Bind(callback, nullptr));
return;
}
base::Callback<void(bool success)> finish_connect =
base::Bind(&HidServiceLinux::FinishConnect,
weak_factory_.GetWeakPtr(),
device_id,
std::string(device_node),
callback);
#if defined(OS_CHROMEOS)
ui_task_runner_->PostTask(FROM_HERE,
base::Bind(RequestAccess,
std::string(device_node),
task_runner_,
finish_connect));
#else
// Use the task runner to preserve the asynchronous behavior of this call on
// non-Chrome OS platforms.
task_runner_->PostTask(FROM_HERE, base::Bind(finish_connect, true));
#endif
}
HidServiceLinux::~HidServiceLinux() {
if (DeviceMonitorLinux::HasInstance())
DeviceMonitorLinux::GetInstance()->RemoveObserver(this);
}
void HidServiceLinux::OnDeviceAdded(udev_device* device) {
if (!device)
return;
const char* device_path = udev_device_get_syspath(device);
if (!device_path)
return;
const char* subsystem = udev_device_get_subsystem(device);
if (!subsystem || strcmp(subsystem, kHidrawSubsystem) != 0)
return;
HidDeviceInfo device_info;
device_info.device_id = device_path;
uint32_t int_property = 0;
const char* str_property = NULL;
udev_device* parent = udev_device_get_parent(device);
if (!parent) {
return;
}
const char* hid_id = udev_device_get_property_value(parent, kHIDID);
if (!hid_id) {
return;
}
std::vector<std::string> parts;
base::SplitString(hid_id, ':', &parts);
if (parts.size() != 3) {
return;
}
if (HexStringToUInt(base::StringPiece(parts[1]), &int_property)) {
device_info.vendor_id = int_property;
}
if (HexStringToUInt(base::StringPiece(parts[2]), &int_property)) {
device_info.product_id = int_property;
}
str_property = udev_device_get_property_value(parent, kHIDUnique);
if (str_property != NULL) {
device_info.serial_number = str_property;
}
str_property = udev_device_get_property_value(parent, kHIDName);
if (str_property != NULL) {
device_info.product_name = str_property;
}
const char* parent_sysfs_path = udev_device_get_syspath(parent);
if (!parent_sysfs_path) {
return;
}
base::FilePath report_descriptor_path =
base::FilePath(parent_sysfs_path).Append(kSysfsReportDescriptorKey);
std::string report_descriptor_str;
if (!base::ReadFileToString(report_descriptor_path, &report_descriptor_str)) {
return;
}
HidReportDescriptor report_descriptor(
reinterpret_cast<uint8_t*>(&report_descriptor_str[0]),
report_descriptor_str.length());
report_descriptor.GetDetails(&device_info.collections,
&device_info.has_report_id,
&device_info.max_input_report_size,
&device_info.max_output_report_size,
&device_info.max_feature_report_size);
AddDevice(device_info);
}
void HidServiceLinux::OnDeviceRemoved(udev_device* device) {
const char* device_path = udev_device_get_syspath(device);;
if (device_path) {
RemoveDevice(device_path);
}
}
void HidServiceLinux::FinishConnect(
const HidDeviceId& device_id,
const std::string device_node,
const base::Callback<void(scoped_refptr<HidConnection>)>& callback,
bool success) {
DCHECK(thread_checker_.CalledOnValidThread());
if (!success) {
callback.Run(nullptr);
}
const auto& map_entry = devices().find(device_id);
if (map_entry == devices().end()) {
callback.Run(nullptr);
}
callback.Run(new HidConnectionLinux(map_entry->second, device_node));
}
} // namespace device
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