gecko-dev/dom/bluetooth/gonk/BluetoothGonkService.cpp

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* Copyright 2012 Mozilla Foundation and Mozilla contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "base/basictypes.h"
#include "BluetoothGonkService.h"
#include "BluetoothDBusService.h"

#include "nsDebug.h"
#include "nsError.h"
#include "nsThreadUtils.h"
#include <dlfcn.h>

USING_BLUETOOTH_NAMESPACE

static struct BluedroidFunctions
{
  bool initialized;

  BluedroidFunctions() :
    initialized(false)
  {
  }

  int (* bt_enable)();
  int (* bt_disable)();
  int (* bt_is_enabled)();
} sBluedroidFunctions;

static bool
EnsureBluetoothInit()
{
  if (sBluedroidFunctions.initialized) {
    return true;
  }

  void* handle = dlopen("libbluedroid.so", RTLD_LAZY);

  if (!handle) {
    NS_ERROR("Failed to open libbluedroid.so, bluetooth cannot run");
    return false;
  }

  sBluedroidFunctions.bt_enable = (int (*)())dlsym(handle, "bt_enable");
  if (!sBluedroidFunctions.bt_enable) {
    NS_ERROR("Failed to attach bt_enable function");
    return false;
  }
  sBluedroidFunctions.bt_disable = (int (*)())dlsym(handle, "bt_disable");
  if (!sBluedroidFunctions.bt_disable) {
    NS_ERROR("Failed to attach bt_disable function");
    return false;
  }
  sBluedroidFunctions.bt_is_enabled = (int (*)())dlsym(handle, "bt_is_enabled");
  if (!sBluedroidFunctions.bt_is_enabled) {
    NS_ERROR("Failed to attach bt_is_enabled function");
    return false;
  }

  sBluedroidFunctions.initialized = true;
  return true;
}

static nsresult
StartStopGonkBluetooth(bool aShouldEnable)
{
  bool result;
  
  // Platform specific check for gonk until object is divided in
  // different implementations per platform. Linux doesn't require
  // bluetooth firmware loading, but code should work otherwise.
  if (!EnsureBluetoothInit()) {
    NS_ERROR("Failed to load bluedroid library.\n");
    return NS_ERROR_FAILURE;
  }

  // return 1 if it's enabled, 0 if it's disabled, and -1 on error
  int isEnabled = sBluedroidFunctions.bt_is_enabled();

  if ((isEnabled == 1 && aShouldEnable) || (isEnabled == 0 && !aShouldEnable)) {
    return NS_OK;
  }
  if (aShouldEnable) {
    result = (sBluedroidFunctions.bt_enable() == 0) ? true : false;
    if (sBluedroidFunctions.bt_is_enabled() < 0) {
      // if isEnabled < 0, this means we brought up the firmware, but something
      // went wrong with bluetoothd. Post a warning message, but try to proceed
      // with firmware unloading if that was requested, so we can retry later.
      NS_WARNING("Bluetooth firmware up, but cannot connect to HCI socket! Check bluetoothd and try stopping/starting bluetooth again.");
      // Just disable now, return an error.
      if (sBluedroidFunctions.bt_disable() != 0) {
        NS_WARNING("Problem shutting down bluetooth after error in bringup!");
      }
      return NS_ERROR_FAILURE;
    }
  } else {
    result = (sBluedroidFunctions.bt_disable() == 0) ? true : false;
  }
  if (!result) {
    NS_WARNING("Could not set gonk bluetooth firmware!");
    return NS_ERROR_FAILURE;
  }
  
  return NS_OK;
}

nsresult
BluetoothGonkService::StartInternal()
{
  MOZ_ASSERT(!NS_IsMainThread());

  nsresult ret;

  ret = StartStopGonkBluetooth(true);

  if (NS_FAILED(ret)) {
    return ret;
  }

  return BluetoothDBusService::StartInternal();
}

nsresult
BluetoothGonkService::StopInternal()
{
  MOZ_ASSERT(!NS_IsMainThread());

  nsresult ret;

  ret = BluetoothDBusService::StopInternal();

  if (NS_FAILED(ret)) {
    return ret;
  }

  return StartStopGonkBluetooth(false);
}

bool
BluetoothGonkService::IsEnabledInternal()
{
  MOZ_ASSERT(!NS_IsMainThread());

  if (!EnsureBluetoothInit()) {
    NS_ERROR("Failed to load bluedroid library.\n");
    return false;
  }

  return (sBluedroidFunctions.bt_is_enabled() == 1);
}