Revert 247926 "HID backend"

trunk/src/device/hid/hid_service_linux.cc

-// 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 <libudev.h>
-#include <string>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/logging.h"
-#include "base/memory/scoped_vector.h"
-#include "base/platform_file.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_piece.h"
-#include "base/strings/string_split.h"
-#include "base/threading/thread_restrictions.h"
-#include "device/hid/hid_connection.h"
-#include "device/hid/hid_connection_linux.h"
-#include "device/hid/hid_device_info.h"
-#include "device/hid/hid_service_linux.h"
-
-namespace device {
-
-namespace {
-
-const char kUdevName[] = "udev";
-const char kUdevActionAdd[] = "add";
-const char kUdevActionRemove[] = "remove";
-const char kHIDSubSystem[] = "hid";
-
-const char kHIDID[] = "HID_ID";
-const char kHIDName[] = "HID_NAME";
-const char kHIDUnique[] = "HID_UNIQ";
-
-} // namespace
-
-HidServiceLinux::HidServiceLinux() {
-  udev_.reset(udev_new());
-  if (!udev_) {
-    LOG(ERROR) << "Failed to create udev.";
-    return;
-  }
-  monitor_.reset(udev_monitor_new_from_netlink(udev_.get(), kUdevName));
-  if (!monitor_) {
-    LOG(ERROR) << "Failed to create udev monitor.";
-    return;
-  }
-  int ret = udev_monitor_filter_add_match_subsystem_devtype(
-      monitor_.get(),
-      kHIDSubSystem,
-      NULL);
-  if (ret != 0) {
-    LOG(ERROR) << "Failed to add udev monitor filter.";
-    return;
-  }
-
-  ret = udev_monitor_enable_receiving(monitor_.get());
-  if (ret != 0) {
-    LOG(ERROR) << "Failed to start udev monitoring.";
-    return;
-  }
-
-  monitor_fd_ = udev_monitor_get_fd(monitor_.get());
-  if (monitor_fd_ <= 0) {
-    LOG(ERROR) << "Failed to start udev monitoring.";
-    return;
-  }
-
-  if (!base::MessageLoopForIO::current()->WatchFileDescriptor(
-      monitor_fd_,
-      true,
-      base::MessageLoopForIO::WATCH_READ,
-      &monitor_watcher_,
-      this))
-    return;
-
-  Enumerate();
-}
-
-HidServiceLinux::~HidServiceLinux() {
-  monitor_watcher_.StopWatchingFileDescriptor();
-  close(monitor_fd_);
-}
-
-void HidServiceLinux::Enumerate() {
-  scoped_ptr<udev_enumerate, UdevEnumerateDeleter> enumerate(
-      udev_enumerate_new(udev_.get()));
-
-  if (!enumerate) {
-    LOG(ERROR) << "Failed to enumerate devices.";
-    return;
-  }
-
-  if (udev_enumerate_add_match_subsystem(enumerate.get(), kHIDSubSystem)) {
-    LOG(ERROR) << "Failed to enumerate devices.";
-    return;
-  }
-
-  if (udev_enumerate_scan_devices(enumerate.get()) != 0) {
-    LOG(ERROR) << "Failed to enumerate devices.";
-    return;
-  }
-
-  // This list is managed by |enumerate|.
-  udev_list_entry* devices = udev_enumerate_get_list_entry(enumerate.get());
-  for (udev_list_entry* i = devices; i != NULL;
-      i = udev_list_entry_get_next(i)) {
-    ScopedUdevDevicePtr hid_dev(
-        udev_device_new_from_syspath(udev_.get(), udev_list_entry_get_name(i)));
-    if (hid_dev) {
-      PlatformDeviceAdd(hid_dev.get());
-    }
-  }
-
-  initialized_ = true;
-}
-
-void HidServiceLinux::PlatformDeviceAdd(udev_device* device) {
-  if (!device)
-    return;
-
-  const char* device_id = udev_device_get_syspath(device);
-  if (!device_id)
-    return;
-
-
-  HidDeviceInfo device_info;
-  device_info.device_id = device_id;
-
-  uint32 int_property = 0;
-  const char* str_property = NULL;
-
-  const char* hid_id = udev_device_get_property_value(device, 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(device, kHIDUnique);
-  if (str_property != NULL)
-    device_info.serial_number = str_property;
-
-  str_property = udev_device_get_property_value(device, kHIDName);
-  if (str_property != NULL)
-    device_info.product_name = str_property;
-
-  AddDevice(device_info);
-}
-
-void HidServiceLinux::PlatformDeviceRemove(udev_device* raw_dev) {
-  // The returned the device is not referenced.
-  udev_device* hid_dev =
-      udev_device_get_parent_with_subsystem_devtype(raw_dev, "hid", NULL);
-
-  if (!hid_dev)
-    return;
-
-  const char* device_id = NULL;
-  device_id = udev_device_get_syspath(hid_dev);
-  if (device_id == NULL)
-    return;
-
-  RemoveDevice(device_id);
-}
-
-scoped_refptr<HidConnection> HidServiceLinux::Connect(std::string device_id) {
-  if (!ContainsKey(devices_, device_id))
-    return NULL;
-  ScopedUdevDevicePtr hid_device(
-      udev_device_new_from_syspath(udev_.get(), device_id.c_str()));
-  if (hid_device) {
-    scoped_refptr<HidConnectionLinux> connection =
-        new HidConnectionLinux(devices_[device_id], hid_device.Pass());
-    if (connection->initialized())
-      return connection;
-  }
-  return NULL;
-}
-
-void HidServiceLinux::OnFileCanReadWithoutBlocking(int fd) {
-  DCHECK_EQ(monitor_fd_, fd);
-
-  ScopedUdevDevicePtr dev(udev_monitor_receive_device(monitor_.get()));
-  if (!dev)
-    return;
-
-  std::string action(udev_device_get_action(dev.get()));
-  if (action == kUdevActionAdd) {
-    PlatformDeviceAdd(dev.get());
-  } else if (action == kUdevActionRemove) {
-    PlatformDeviceRemove(dev.get());
-  }
-}
-
-void HidServiceLinux::OnFileCanWriteWithoutBlocking(int fd) {}
-
-} // namespace dev