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
相关模块
bluetooth.apk : packagesappsBluetooth目录下
libbluetooth_jni: packagesappsBluetoothjni目录下
libhardware: hardwarelibhardware目录下 加载 module.{vendor}.so ,蓝牙模块就是bluetooth.{vendor}.so
bluetooth.default.so: externalbluetoothbluedroidmain , externalbluetoothbluedroid 打开各个厂商的动态库libbt-vendor_{vendor}.so, eg:libbt-vendor_rtk.so
依赖libbt-hci.so、libbt-utils.so、libbt-vendor_xxx.so
libbt-vendor_xxx.so: bluetooth.default.so 或者bluetooth.{vendor}.so会打开该库
audio.a2dp.default.so：高级音频传输库
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:
- ro.hardware.bluetooth=vendor
- load(../../bluetooth.vendor.so)
- module->methods->open()
initNative: - sBluetoothInterface->init() // bluetooth.default.so (externalbluetoothbluedroidbtifsrcbluetooth.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,...,..)
- sBluetoothInterface->set_os_callouts()
- sBluetoothInterface->get_profile_interface(BT_PROFILE_SOCKETS_ID)
- sBluetoothInterface->get_profile_interface(BT_PROFILE_MAP_CLIENT_ID)
- sBluetoothMceInterface->init()
enableNative: - enable() // bluetooth.default.so externalbluetoothbluedroidbtifsrcbluetooth.c
- btif_enable_bluetooth()
- 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externalbluetoothbluedroidbtifsrcbluetooth.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 externalbluetoothbluedroidhcisrcvendor.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