当前位置: article > 正文

android蓝牙模块有哪些类型,Android 蓝牙模块框架分析

作者：从前慢现在也慢 | 2024-05-02 11:00:03

踩

libbt-vendor_uart.so

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 : packages\apps\Bluetooth目录下

libbluetooth_jni: packages\apps\Bluetooth\jni目录下

libhardware: hardware\libhardware目录下加载 module.{vendor}.so ,蓝牙模块就是bluetooth.{vendor}.so

bluetooth.default.so: external\bluetooth\bluedroid\main , external\bluetooth\bluedroid 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:

1. ro.hardware.bluetooth=

vendor

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