| // Copyright 2018 The Chromium OS 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 "cecservice/udev.h" |
| |
| #include <base/bind.h> |
| #include <base/logging.h> |
| |
| namespace { |
| |
| struct UdevDeviceDeleter { |
| void operator()(udev_device* device) const { udev_device_unref(device); } |
| }; |
| |
| struct UdevEnumerateDeleter { |
| void operator()(udev_enumerate* enumerate) const { |
| udev_enumerate_unref(enumerate); |
| } |
| }; |
| |
| } // namespace |
| |
| namespace cecservice { |
| |
| UdevImpl::UdevImpl() = default; |
| |
| bool UdevImpl::Init(const DeviceCallback& device_added_callback, |
| const DeviceCallback& device_removed_callback) { |
| device_added_callback_ = device_added_callback; |
| device_removed_callback_ = device_removed_callback; |
| |
| udev_.reset(udev_new()); |
| if (!udev_) { |
| LOG(ERROR) << "Failed to create libudev instance"; |
| return false; |
| } |
| |
| monitor_.reset(udev_monitor_new_from_netlink(udev_.get(), "udev")); |
| if (!monitor_) { |
| LOG(ERROR) << "Failed to create udev monitor"; |
| return false; |
| } |
| |
| if (udev_monitor_filter_add_match_subsystem_devtype(monitor_.get(), "cec", |
| nullptr) < 0) { |
| LOG(ERROR) << "Failed to create udev filter for cec devices"; |
| return false; |
| } |
| |
| if (udev_monitor_enable_receiving(monitor_.get()) < 0) { |
| LOG(ERROR) << "Failed to enable receiving on udev monitor"; |
| return false; |
| } |
| |
| taskid_ = brillo::MessageLoop::current()->WatchFileDescriptor( |
| FROM_HERE, udev_monitor_get_fd(monitor_.get()), |
| brillo::MessageLoop::kWatchRead, true, |
| base::Bind(&UdevImpl::OnDeviceAction, weak_factory_.GetWeakPtr())); |
| if (taskid_ == brillo::MessageLoop::kTaskIdNull) { |
| LOG(ERROR) << "Failed to register listener on udev descriptor"; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| UdevImpl::~UdevImpl() { |
| brillo::MessageLoop::current()->CancelTask(taskid_); |
| } |
| |
| bool UdevImpl::EnumerateDevices( |
| std::vector<base::FilePath>* devices_out) const { |
| DCHECK(udev_) << "Udev not initialized"; |
| |
| std::unique_ptr<udev_enumerate, UdevEnumerateDeleter> enumerate( |
| udev_enumerate_new(udev_.get())); |
| if (!enumerate) { |
| LOG(ERROR) << "Failed to create udev enumeration"; |
| return false; |
| } |
| |
| if (udev_enumerate_add_match_subsystem(enumerate.get(), "cec") < 0) { |
| LOG(ERROR) << "Failed to add subsytem filter to udev enumeration"; |
| return false; |
| } |
| |
| if (udev_enumerate_scan_devices(enumerate.get()) < 0) { |
| LOG(ERROR) << "Failed to scan devices with udev"; |
| return false; |
| } |
| |
| udev_list_entry* entry; |
| udev_list_entry* devices_list = |
| udev_enumerate_get_list_entry(enumerate.get()); |
| udev_list_entry_foreach(entry, devices_list) { |
| const char* name = udev_list_entry_get_name(entry); |
| if (!name) { |
| LOG(WARNING) << "Failed to get entry name"; |
| continue; |
| } |
| |
| std::unique_ptr<udev_device, UdevDeviceDeleter> device( |
| udev_device_new_from_syspath(udev_.get(), name)); |
| if (!device) { |
| PLOG(WARNING) << "Failed to create device from syspath:" << name; |
| continue; |
| } |
| |
| const char* path = udev_device_get_devnode(device.get()); |
| if (path) { |
| devices_out->push_back(base::FilePath(path)); |
| } else { |
| LOG(WARNING) << "Failed to get device node for:" << name; |
| } |
| } |
| |
| return true; |
| } |
| |
| void UdevImpl::OnDeviceAction() { |
| std::unique_ptr<udev_device, UdevDeviceDeleter> device( |
| udev_monitor_receive_device(monitor_.get())); |
| if (!device) { |
| return; |
| } |
| |
| const char* action = udev_device_get_action(device.get()); |
| if (!action) { |
| LOG(WARNING) << "Failed to get device action"; |
| return; |
| } |
| |
| const char* path = udev_device_get_devnode(device.get()); |
| base::FilePath file_path; |
| if (path) { |
| file_path = base::FilePath(path); |
| } else { |
| LOG(WARNING) << "Failed to get device path"; |
| return; |
| } |
| |
| if (!strcmp(action, "add")) { |
| device_added_callback_.Run(file_path); |
| } else if (!strcmp(action, "remove")) { |
| device_removed_callback_.Run(file_path); |
| } |
| } |
| |
| void UdevImpl::UdevDeleter::operator()(udev* udev) const { |
| udev_unref(udev); |
| } |
| |
| void UdevImpl::UdevMonitorDeleter::operator()(udev_monitor* udev) const { |
| udev_monitor_unref(udev); |
| } |
| |
| UdevFactory::~UdevFactory() = default; |
| |
| UdevFactoryImpl::UdevFactoryImpl() = default; |
| |
| UdevFactoryImpl::~UdevFactoryImpl() = default; |
| |
| std::unique_ptr<Udev> UdevFactoryImpl::Create( |
| const Udev::DeviceCallback& device_added_callback, |
| const Udev::DeviceCallback& device_removed_callback) const { |
| auto udev = std::make_unique<UdevImpl>(); |
| if (!udev->Init(device_added_callback, device_removed_callback)) { |
| return nullptr; |
| } |
| |
| return udev; |
| } |
| |
| } // namespace cecservice |