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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/ozone/device/udev/device_manager_udev.h"
#include <stddef.h>
#include "base/message_loop/message_loop_current.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/trace_event/trace_event.h"
#include "ui/events/ozone/device/device_event.h"
#include "ui/events/ozone/device/device_event_observer.h"
namespace ui {
namespace {
const char* const kSubsystems[] = {
"input",
"drm",
};
// Severity levels from syslog.h. We can't include it directly as it
// conflicts with base/logging.h
enum {
SYS_LOG_EMERG = 0,
SYS_LOG_ALERT = 1,
SYS_LOG_CRIT = 2,
SYS_LOG_ERR = 3,
SYS_LOG_WARNING = 4,
SYS_LOG_NOTICE = 5,
SYS_LOG_INFO = 6,
SYS_LOG_DEBUG = 7,
};
// Log handler for messages generated from libudev.
void UdevLog(struct udev* udev,
int priority,
const char* file,
int line,
const char* fn,
const char* format,
va_list args) {
if (priority <= SYS_LOG_ERR)
LOG(ERROR) << "libudev: " << fn << ": " << base::StringPrintV(format, args);
else if (priority <= SYS_LOG_INFO)
VLOG(1) << "libudev: " << fn << ": " << base::StringPrintV(format, args);
else // SYS_LOG_DEBUG
VLOG(2) << "libudev: " << fn << ": " << base::StringPrintV(format, args);
}
// Create libudev context.
device::ScopedUdevPtr UdevCreate() {
struct udev* udev = device::udev_new();
if (udev) {
device::udev_set_log_fn(udev, UdevLog);
device::udev_set_log_priority(udev, SYS_LOG_DEBUG);
}
return device::ScopedUdevPtr(udev);
}
// Start monitoring input device changes.
device::ScopedUdevMonitorPtr UdevCreateMonitor(struct udev* udev) {
struct udev_monitor* monitor =
device::udev_monitor_new_from_netlink(udev, "udev");
if (monitor) {
for (size_t i = 0; i < base::size(kSubsystems); ++i)
device::udev_monitor_filter_add_match_subsystem_devtype(
monitor, kSubsystems[i], NULL);
if (device::udev_monitor_enable_receiving(monitor))
LOG(ERROR) << "Failed to start receiving events from udev";
} else {
LOG(ERROR) << "Failed to create udev monitor";
}
return device::ScopedUdevMonitorPtr(monitor);
}
} // namespace
DeviceManagerUdev::DeviceManagerUdev()
: udev_(UdevCreate()), controller_(FROM_HERE) {}
DeviceManagerUdev::~DeviceManagerUdev() {
}
void DeviceManagerUdev::CreateMonitor() {
if (monitor_)
return;
monitor_ = UdevCreateMonitor(udev_.get());
if (monitor_) {
int fd = device::udev_monitor_get_fd(monitor_.get());
CHECK_GT(fd, 0);
base::MessageLoopCurrentForUI::Get()->WatchFileDescriptor(
fd, true, base::MessagePumpLibevent::WATCH_READ, &controller_, this);
}
}
void DeviceManagerUdev::ScanDevices(DeviceEventObserver* observer) {
CreateMonitor();
device::ScopedUdevEnumeratePtr enumerate(
device::udev_enumerate_new(udev_.get()));
if (!enumerate)
return;
for (size_t i = 0; i < base::size(kSubsystems); ++i)
device::udev_enumerate_add_match_subsystem(enumerate.get(), kSubsystems[i]);
device::udev_enumerate_scan_devices(enumerate.get());
struct udev_list_entry* devices =
device::udev_enumerate_get_list_entry(enumerate.get());
struct udev_list_entry* entry;
udev_list_entry_foreach(entry, devices) {
device::ScopedUdevDevicePtr device(device::udev_device_new_from_syspath(
udev_.get(), device::udev_list_entry_get_name(entry)));
if (!device)
continue;
std::unique_ptr<DeviceEvent> event = ProcessMessage(device.get());
if (event)
observer->OnDeviceEvent(*event.get());
}
}
void DeviceManagerUdev::AddObserver(DeviceEventObserver* observer) {
observers_.AddObserver(observer);
}
void DeviceManagerUdev::RemoveObserver(DeviceEventObserver* observer) {
observers_.RemoveObserver(observer);
}
void DeviceManagerUdev::OnFileCanReadWithoutBlocking(int fd) {
// The netlink socket should never become disconnected. There's no need
// to handle broken connections here.
TRACE_EVENT1("evdev", "UdevDeviceChange", "socket", fd);
device::ScopedUdevDevicePtr device(
device::udev_monitor_receive_device(monitor_.get()));
if (!device)
return;
std::unique_ptr<DeviceEvent> event = ProcessMessage(device.get());
if (event)
for (DeviceEventObserver& observer : observers_)
observer.OnDeviceEvent(*event.get());
}
void DeviceManagerUdev::OnFileCanWriteWithoutBlocking(int fd) {
NOTREACHED();
}
std::unique_ptr<DeviceEvent> DeviceManagerUdev::ProcessMessage(
udev_device* device) {
const char* path = device::udev_device_get_devnode(device);
const char* action = device::udev_device_get_action(device);
const char* subsystem =
device::udev_device_get_property_value(device, "SUBSYSTEM");
if (!path || !subsystem)
return nullptr;
DeviceEvent::DeviceType device_type;
if (!strcmp(subsystem, "input") &&
base::StartsWith(path, "/dev/input/event", base::CompareCase::SENSITIVE))
device_type = DeviceEvent::INPUT;
else if (!strcmp(subsystem, "drm") &&
base::StartsWith(path, "/dev/dri/card",
base::CompareCase::SENSITIVE))
device_type = DeviceEvent::DISPLAY;
else
return nullptr;
DeviceEvent::ActionType action_type;
if (!action || !strcmp(action, "add"))
action_type = DeviceEvent::ADD;
else if (!strcmp(action, "remove"))
action_type = DeviceEvent::REMOVE;
else if (!strcmp(action, "change"))
action_type = DeviceEvent::CHANGE;
else
return nullptr;
return std::make_unique<DeviceEvent>(device_type, action_type,
base::FilePath(path));
}
} // namespace ui
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