Android 蓝牙模块框架分析

Android Bluedroid 框架图

蓝牙组件

Bluetooth core stack library

HCI library

Vendor Specific HCI library

UART, RFKILL,TUN/TAP and UHID device drivers

主体调用流程

(1) BluetoothManagerService == mBluetooth(AdapterService) ==>
(2) AdapterService == classInitNative, initNative, enableNative ==>
(3) com_android_bluetooth_btservice_AdapterService == hw_get_module // libhardware.so ==>
classInitNative:
1. ro.hardware.bluetooth= vendor
2. load(../../bluetooth. vendor.so)
3. module->methods->open()
initNative:
1. sBluetoothInterface->init() // bluetooth.default.so (external\bluetooth\bluedroid\btif\src\bluetooth.c)
bt_utils_init ,
btif_init_bluetooth() //btif_core.c BTIF main task prepares BT scheduler for startup
--->btif_config_init
--->bte_main_boot_entry
--->GKI_init()
--->bte_main_in_hw_init() //Internal helper function for chip hardware init
---> bt_hc_get_interface() // libbt-hci.so
--->bte_load_conf()
--->bte_load_ble_conf()
--->....
--->btif_fetch_local_bdaddr
--->GKI_create_task(btif_task,...,..)

2. sBluetoothInterface->set_os_callouts()
3. sBluetoothInterface->get_profile_interface(BT_PROFILE_SOCKETS_ID)
4. sBluetoothInterface->get_profile_interface(BT_PROFILE_MAP_CLIENT_ID)
5. sBluetoothMceInterface->init()
enableNative:
1. enable() // bluetooth.default.so external\bluetooth\bluedroid\btif\src\bluetooth.c
2. btif_enable_bluetooth()
3. bte_main_enable()
--->GKI_create_task(btu_task,...,..)
--->bte_hci_enable()
---->bt_hc_if->init() // bt_hc_if为bt_hc_interface_t类型，也bt_hci_bdroid.c中init
---> vendor_open() // 打开libbt-vendor.so 可以配置成各个厂商的库，eg:bcm的libbt-vendor_bcm.so
--->utils_init()
--->userial_init()
--->....

主干流程： Bluetooth.apk --> libhardware.so --> bluetooth.{vendor}.so --> libbt-hci.so --> libbt-vendor_xxx.so

hardware层移植任务

（1）对应厂商的bluetooth.{vendor}.so库的实现 // 参考bluetooth.default.so 完成hw_module_t 结构体HAL_MODULE_INFO_SYM的填充，相关结构体hw_module_methods_t，bt_interface_t方法的实现

typedef struct {    /** set to sizeof(bt_interface_t) */    size_t size;    /**     * Opens the interface and provides the callback routines     * to the implemenation of this interface.     */    int (*init)(bt_callbacks_t* callbacks );    /** Enable Bluetooth. */    int (*enable)(void);    /** Disable Bluetooth. */    int (*disable)(void);    /** Closes the interface. */    void (*cleanup)(void);    /** Get all Bluetooth Adapter properties at init */    int (*get_adapter_properties)(void);    /** Get Bluetooth Adapter property of 'type' */    int (*get_adapter_property)(bt_property_type_t type);    /** Set Bluetooth Adapter property of 'type' */    /* Based on the type, val shall be one of     * bt_bdaddr_t or bt_bdname_t or bt_scanmode_t etc     */    int (*set_adapter_property)(const bt_property_t *property);    /** Get all Remote Device properties */    int (*get_remote_device_properties)(bt_bdaddr_t *remote_addr);    /** Get Remote Device property of 'type' */    int (*get_remote_device_property)(bt_bdaddr_t *remote_addr,                                      bt_property_type_t type);    /** Set Remote Device property of 'type' */    int (*set_remote_device_property)(bt_bdaddr_t *remote_addr,                                      const bt_property_t *property);    /** Get Remote Device's service record  for the given UUID */    int (*get_remote_service_record)(bt_bdaddr_t *remote_addr,                                     bt_uuid_t *uuid);    /** Start SDP to get remote services */    int (*get_remote_services)(bt_bdaddr_t *remote_addr);    /** Start Discovery */    int (*start_discovery)(void);    /** Cancel Discovery */    int (*cancel_discovery)(void);    /** Create Bluetooth Bonding */    int (*create_bond)(const bt_bdaddr_t *bd_addr, int transport);    /** Remove Bond */    int (*remove_bond)(const bt_bdaddr_t *bd_addr);    /** Cancel Bond */    int (*cancel_bond)(const bt_bdaddr_t *bd_addr);    /**     * Get the connection status for a given remote device.     * return value of 0 means the device is not connected,     * non-zero return status indicates an active connection.     */    int (*get_connection_state)(const bt_bdaddr_t *bd_addr);    /** BT Legacy PinKey Reply */    /** If accept==FALSE, then pin_len and pin_code shall be 0x0 */    int (*pin_reply)(const bt_bdaddr_t *bd_addr, uint8_t accept,                     uint8_t pin_len, bt_pin_code_t *pin_code);    /** BT SSP Reply - Just Works, Numeric Comparison and Passkey     * passkey shall be zero for BT_SSP_VARIANT_PASSKEY_COMPARISON &     * BT_SSP_VARIANT_CONSENT     * For BT_SSP_VARIANT_PASSKEY_ENTRY, if accept==FALSE, then passkey     * shall be zero */    int (*ssp_reply)(const bt_bdaddr_t *bd_addr, bt_ssp_variant_t variant,                     uint8_t accept, uint32_t passkey);    /** Get Bluetooth profile interface */    const void* (*get_profile_interface) (const char *profile_id);    /** Bluetooth Test Mode APIs - Bluetooth must be enabled for these APIs */    /* Configure DUT Mode - Use this mode to enter/exit DUT mode */    int (*dut_mode_configure)(uint8_t enable);    /* Send any test HCI (vendor-specific) command to the controller. Must be in DUT Mode */    int (*dut_mode_send)(uint16_t opcode, uint8_t *buf, uint8_t len);    /** BLE Test Mode APIs */    /* opcode MUST be one of: LE_Receiver_Test, LE_Transmitter_Test, LE_Test_End */    int (*le_test_mode)(uint16_t opcode, uint8_t *buf, uint8_t len);    /* enable or disable bluetooth HCI snoop log */    int (*config_hci_snoop_log)(uint8_t enable);    /** Sets the OS call-out functions that bluedroid needs for alarms and wake locks.      * This should be called immediately after a successful |init|.      */    int (*set_os_callouts)(bt_os_callouts_t *callouts);    /** Read Energy info details - return value indicates BT_STATUS_SUCCESS or BT_STATUS_NOT_READY      * Success indicates that the VSC command was sent to controller      */    int (*read_energy_info)();    // MStar Android Patch Begin    /** This ensures the chip is Powered ON  to support other radios in the combo chip.     * If the chip is OFF it set the chip to ON, if it is already ON it just increases the radio ref count     * to keep track when to Power OFF */    int (*enableRadio)(void);    /** This decreases radio ref count  and ensures that chip is Powered OFF     * when the radio ref count becomes zero. */    int (*disableRadio)(void);     /* Send any test HCI (vendor-specific) command */     int (*send_vsc)(uint16_t opcode, uint8_t *buf, uint8_t len);     /**Set secure mode configurations*/     int (*secure_mode_configure)(uint8_t secure_mode, uint8_t scans_disabled,                                 uint8_t insec_pair_disabled);     /**Force disable bluetooth*/     void (*force_disable) ();     /** Add/remove SDP record */     int (*set_sdp_record)(uint8_t enable, uint16_t uuid);    // MStar Android Patch End} bt_interface_t;

详参external\bluetooth\bluedroid\btif\src\bluetooth.c
（2）完成libbt-vendor_{vendor}.so模块的实现主要bt_vendor_interface_t结构体中init，op，cleanup方法的实现

typedef struct {    /** Set to sizeof(bt_vndor_interface_t) */    size_t          size;    /*     * Functions need to be implemented in Vendor libray (libbt-vendor.so).     */    /**     * Caller will open the interface and pass in the callback routines     * to the implemenation of this interface.     */    int   (*init)(const bt_vendor_callbacks_t* p_cb, unsigned char *local_bdaddr);    /**  Vendor specific operations */    int (*op)(bt_vendor_opcode_t opcode, void *param);    /** Closes the interface */    void  (*cleanup)(void);} bt_vendor_interface_t;

动态加载节点

（1） hardware层 bluetooth.{vendor}.so 加载 hardware.c文件中可以看到， load 加载的库在/system/lib64/hw，/system/lib/hw，/vendor/lib64/hw，/vendor/lib/hw之中，但是加载的库名称根据定义的ro.hardware.bluetooth的值来确定
（2）bluetooth.{vendor}.so加载 libbt-hci.so
（3）libbt-hci.so加载libbt-vendor_xxx.so external\bluetooth\bluedroid\hci\src\vendor.c 文件会根据VENDOR_LIBRARY_NAME定义的值来加载动态库，默认是libbt-vendor.so

相关链接：移植：http://blog.csdn.net/xiaojsj111/article/details/12647923#t2 蓝牙简介：http://blog.chinaunix.net/uid-24227137-id-3359410.html Hiconfig：http://blog.csdn.net/xubin341719/article/details/38640533

Android Bluedroid 框架图

蓝牙组件

相关模块

主体调用流程

hardware层移植任务

动态加载节点

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