android 4.0 藍芽分析之二

原址

packages/apps/Settings/src/com/Android/settings/bluetooth/BluetoothSettings.Java

onCreateOptionsMenu(Menu menu, MenuInflater inflater)

建立選單，裡面有MENU_ID_SCAN，MENU_ID_RENAME_DEVICE，MENU_ID_VISIBILITY_TIMEOUT，MENU_ID_SHOW_RECEIVED

onOptionsItemSelected(MenuItem item)

選單對應的執行操作

（1）Bluetoothd daemon

external/bluetooth/bluez/src/main.c

main

|——init_defaults 填充main_opts

|——g_option_context_new 下面四步是引數解析相關

|——g_option_context_add_main_entries

|——g_option_context_parse

|——g_option_context_free

|——daemon(0, 0) 引數為0,則將輸出都定向到/dev/null

|——__btd_log_init 列印一些log

|——agent_init

|——connection = dbus_bus_get (DBUS_BUS_SYSTEM, NULL)

|——connect_dbus()

|——g_dbus_setup_bus 註冊dbus連線,並重新命名為"org.bluez"

|——manager_init(conn, "/") 設定base_path

|——g_dbus_register_interface 註冊interface,包括medhod,signal

|——set_dbus_connection(conn) 設定connection為conn

|——start_sdp_server 初始化sdp協議

|——init_server

|——建立l2cap_sock套接字

|——bind l2cap_sock

|——listen l2cap_sock

|——listen unix_sock

|——io = g_io_channel_unix_new(l2cap_sock)

|——g_io_add_watch(io,, io_accept_event, &l2cap_sock) 等待對方connect

|——accept l2cap_sock/unix_sock操作

|——plugin_init

|——執行plugin init

|——g_main_loop_new

|——adapter_ops_setup

|——ops->setup()

|——rfkill_init 電源操作

|——g_main_loop_run

/********************** main結束 ************************/

hciops_init

|——btd_register_adapter_ops(&hci_ops, FALSE);

|——g_slist設定,將ops儲存

hciops_setup

|——socket(,SOCK_RAW, BTPROTO_HCI)

|——hci_filter_set_ptype HCI_EVENT_PKT/EVT_STACK_INTERNAL設定過濾

|——setsockopt(,,HCI_FILTER, &flt,)

|——bind

|——g_io_add_watch(,,io_stack_event,)

|——g_idle_add(init_known_adapters,)

init_known_adapters

|——ioctl HCIGETDEVLIST

|——init_device

|——hci_open_dev

|——start_hci_dev

|——setsockopt HCI_FILTER設定event事件過濾

|——g_io_add_watch_full io_security_event 檢測event事件

|——ioctl HCISETLINKMODE

|——ioctl HCIDEVUP

|——device_event HCI_DEV_UP

device_devup_setup

|——hci_send_cmd(,,READ_STORED_LINK_KEY_CP_SIZE,)

|——init_adapter(index)

|——btd_manager_register_adapter

|——adapter_create

|——g_dbus_register_interface 註冊interface

|——adapter_init 讀取bdaddr,name,features

|——g_dbus_emit_signal “AdapterAdded” to "org.bluez.Manager"

|——manager_update_adapters

|—— sned signal "PropertyChanged" value "Adapters"

|——manager_set_default_adapter

|——send signal “DefaultAdapterChanged”

|——start_adapter

|——set_event_mask

|——set DEFAULT_LINK_POLICY

|——btd_adapter_start

|——send signal "PropertyChanged" value "Powered"

(2)藍芽服務啟動

SystemServer

|―― bluetooth.initAfterA2dpRegistration();

|―― mEventLoop.getProfileProxy();

|―― mAdapter.getProfileProxy(, ,BluetoothProfile.A2DP);

|―― a2dp = new BluetoothA2dp(context, listener);

|―― mServiceListener.onServiceConnected(BluetoothProfile.A2DP,);

|―― mService = (BluetoothA2dp) proxy;

|―― mAdapter.getProfileProxy(, ,BluetoothProfile. INPUT_DEVICE);

|―― iDev = new BluetoothInputDevice(context, listener);

(3)enable過程

LocalBluetoothAdapter.enable()

|―― mAdapter.enable();

|―― mService.enable();

|―― mBluetoothState.sendMessage(USER_TURN_ON, saveSetting);

|―― broadcastState(BluetoothAdapter.STATE_TURNING_ON);

|―― prepareBluetooth();

|―― mBluetoothService.enableNative();

|―― bt_enable();

（4）scan過程

BluetoothSettings

|―― onPreferenceTreeClick KEY_BT_SCAN 點選scan

|―― mLocalAdapter.startScanning(true);

|―― a2dp.isA2dpPlaying() – return; 如果A2DP正在播放,則退出

|―― mAdapter.startDiscovery()

|―― mService.startDiscovery()

|―― startDiscoveryNative()

|―― dbus介面 -- StartDiscovery

|―― adapter_start_discovery bluez中接收到

|―― start_discovery(adapter);

|―― hciops_start_discovery

|―― hciops_start_inquiry

|―― hci_send_cmd(,OCF_INQUIRY, ,);

事件返回處理

Inquiry指令發出後，host會收到三種event事件回覆

Command status Event、Inquiry result Event、Inquiry Complete event

io_security_event

|―― read(fd, buf, sizeof(buf));

|―― switch (eh->evt)事件型別查詢

|——cmd_status case EVT_CMD_STATUS Discovering

|―― inquiry_complete_evt -- case EVT_INQUIRY_COMPLETE

|―― set_state(index, DISCOV_HALTED);

|―― inquiry_result -- case EVT_INQUIRY_RESULT

|―― btd_event_device_found

|―― adapter_update_found_devices

|―― adapter_emit_device_found

|―― emit_device_found

|―― dbus_message_new_signal(, , "DeviceFound");

|―― g_dbus_send_message(connection, signal);

JNI處的dbus接收到” DeviceFound” singal後，回撥到JNI

BluetoothEventLoop. event_filter

|―― dbus_message_is_signal(,"org.bluez.Adapter", "DeviceFound")??

|―― parse_remote_device_properties(env, &iter)

|―― env->CallVoidMethod(,method_onDeviceFound, ,);

|―― onDeviceFound

|―― addDevice(address, properties);

|―― send intent BluetoothDevice.ACTION_FOUND

BluetoothEventManager.java 接收intent

DeviceFoundHandler

|―― mDeviceManager.addDevice -- cachedDevice

|―― dispatchDeviceAdded(cachedDevice);

回撥，在UI上顯示掃描到得裝置

（5）SDP流程

搜尋到某裝置後，確定該裝置所具有的profile

CachedBluetoothDevice

|―― fillData()

|―― fetchName();

|―― fetchBtClass();

|―― updateProfiles();

|―― mProfileManager.updateProfiles

add A2dpProfile HeadsetProfile

|——dispatchAttributesChanged();

回撥，UI顯示

（6）pair過程

BluetoothSettings

DeviceListPreferenceFragment

|―― onPreferenceTreeClick 點選除scan外的其它區域

|——onDevicePreferenceClick

|——BluetoothDevicePreference.onClicked()

|——pair() 配對

|——CachedBluetoothDevice. startPairing()

|——BluetoothDevice. createBond()

IBluetooth callback介面

|——BluetoothService. createBond

|——createPairedDeviceNative (address, 60000) 一分鐘

|——dbus_func_args_async(, , , ,"CreatePairedDevice",)

|——dbus介面 CreatePairedDevice

|——create_paired_device bluez中處理

|——dbus_message_get_args 讀取需要匹配的device資訊

|——create_device_internal

|——adapter_create_device

|——dbus signal “DeviceCreated”

|——adapter_update_devices

|——dbus “PropertyChanged” “Devices”

|——device_create_bonding

|——adapter_create_bonding

|——hciops_create_bonding(BT_IO_L2RAW, , ,)

|——l2cap_connect 建立L2CAP連線

|——connect_add

|——bonding_request_new

|——mBondState.setBondState(,BOND_BONDING) 改變狀態為bonding

|——new Intent ACTION_BOND_STATE_CHANGED

BluetoothEventManager.java 接收intent

|——BondStateChangedHandler

|——dispatchAttributesChanged();

UI上顯示

JNI收到 “DeviceCreated” signal

onDeviceCreated

|——mBluetoothService.getRemoteDeviceProperties

|——addDevice(address, properties)

|——send intent “ACTION_FOUND”

JNI處的dbus接收到”RequestPairingConsent” singal後，回撥到JNI

env->CallVoidMethod(, method_onRequestPairingConsent,,)

BluetoothEventLoop.java

|——onRequestPairingConsent

|——send intent ACTION_PAIRING_REQUEST

(7)connect過程

BluetoothDevicePreference.onClicked()

|——CachedBluetoothDevice. connect(true)

|——connectWithoutResettingTimer(connectAllProfiles); 連線所有profile

|——for (LocalBluetoothProfile profile : mProfiles) 遍歷每個profile

|——connectInt (profile)

|——profile.connect (mDevice) A2DP HSP connect

(8)A2DP profile

A2dpProfile. connect()

|——BluetoothA2dp. connect()

|——BluetoothA2dpService. connect()

|——BluetoothService. connectSink

msg.arg1 = BluetoothDeviceProfileState.CONNECT_A2DP_OUTGOING;

|——BluetoothProfileState. sendMsg(msg)

|——BluetoothDeviceProfileState. sendMessage(cmd)

|——BluetoothA2dpService. connectSinkInternal

|——handleSinkStateChange STATE_CONNECTING

|——BluetoothService.sendConnectionStateChange

|——updateProfileConnectionState

|——connectSinkNative

|——dbus_func_args_async

("org.bluez.AudioSink", "Connect",)

Bluez org.bluez.AudioSink 收到Connect訊號後

bluez/audio/device.c

dev_connect

|——sink_setup_stream

|——avdtp_discover

|——send_request(,,,AVDTP_DISCOVER,)

BluetoothA2dpService.cpp 收到dbus訊號

onConnectSinkResult

回撥到 BluetoothA2dpService.java

|——onConnectSinkResult

android 4.0 藍芽分析之二

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