一、蓝牙的架构
Android4.2 之后采用 bluedroid 作为协议；整体由 bluetooth.apk,bluedroid ,libbt-vendor 三个 部 分 组 成 。- bluetooth.apk ：作 为 蓝 牙 服 务 进 程 ， 通 过 libblueooth_jni 层 获 取bluetooth*.default.so 提 供 的bt_interface_t 控 制 接 口 并 状 态 与 数 据 回 调 注 册 到bluetooth*.default.so；完成对蓝牙模块的控制与数据接收；
- libbluetooth：主要是bluedroid的蓝牙协议栈的具体实现，向下调用libbt-hci的接口加载**libbt-vendor；**向上供libblueooth_jni的回调；
- **libbt-vendor *完成对蓝牙模块硬件初始化与控制（物理通讯接口初始化，固件下载，供电控制）RK平台通过判断wifi+Bt模块的type，在libbuetooth_jni层选择加载不同适配厂商协议栈；并在libbt-hci中根据模块类型加载不同厂家模块的libbt-vendor.so，完成动态适配模块。
RK 平台通过判断模块的 type，在 libbuetooth_jni 层选择加载不同适配厂商协议栈；并在 libbt-hci 中根据模块类型加载不同厂家模块的 libbt-vendor*.so，完成动态适配模块。
二、USB 蓝牙模块的调试
这里选项的是RTL8723DU的一款USB蓝牙适配器，下面将从kernel开始一步步看下适配过程；
2.1 kernel部分
首先，将Realtek提供的蓝牙驱动文件rtk_btusb.h和rtk_btusb.c拷贝到kernel的drivers/bluetooth/目录下：
kernel-5.10/drivers/bluetooth/rtk_btusb.ckernel-5.10/drivers/bluetooth/rtk_btusb.h修改kernel的drivers/bluetooth/目录下的文件“Kconfig” 和“Makefile”。
config BT_RTKBTUSB tristate "RTK HCI USB driver" depends on USB help RTK Bluetooth HCI USB driverobj-$(CONFIG_BT_RTKBTUSB)+= rtk_btusb.o平台对应的defconfig文件添加Realtek BT Chip支持的宏定义，这里是dten_ribeye_me_pro.config文件
diff --git a/kernel-5.10/arch/arm64/configs/dten_ribeye_me_pro.config b/kernel-5.10/arch/arm64/configs/dten_ribeye_me_pro.configindex 54246f39..6894e782 100755--- a/kernel-5.10/arch/arm64/configs/dten_ribeye_me_pro.config+++ b/kernel-5.10/arch/arm64/configs/dten_ribeye_me_pro.config@@ -34,3 +34,5 @@ CONFIG_RTC_DRV_AT8563=y #DTEN Codec AD82088 CONFIG_SND_SOC_AD82088=y CONFIG_BACKLIGHT_PWM=n+# Add for usb bluetooth adapter+CONFIG_BT_RTKBTUSB=y2.2 增加设备节点以及权限
device/rockchip/common目录：添加一些节点的权限和一些宏控开关
在device/rockchip/common/init.connectivity.rc文件（一般rk平台代码已经添加）：
cfliu@sw-eng:RKOverlay$ gd device/rockchip/common/init.connectivity.rcdiff --git a/device/rockchip/common/init.connectivity.rc b/device/rockchip/common/init.connectivity.rcindex 82603ec0..db2e7176 100755--- a/device/rockchip/common/init.connectivity.rc+++ b/device/rockchip/common/init.connectivity.rc@@ -8,6 +8,8 @@ on zygote-start chown bluetooth net_bt /proc/bluetooth/sleep/lpm chown bluetooth net_bt /proc/bluetooth/sleep/btwrite + # USB device+ insmod /system/lib/modules/rtk_btusb.ko chmod 0660 /dev/rtk_btusb chown bluetooth net_bt /dev/rtk_btusb chmod 0660 /dev/rtkbt_dev在device/rockchip/common/wifi_bt_common.mk文件（一般rk平台代码已经添加），这个先关闭BCM的芯片，防止BCM的影响。
diff --git a/device/rockchip/common/wifi_bt_common.mk b/device/rockchip/common/wifi_bt_common.mkindex 23149e85..af3c7017 100644--- a/device/rockchip/common/wifi_bt_common.mk+++ b/device/rockchip/common/wifi_bt_common.mk@@ -53,7 +53,7 @@ WIFI_DRIVER_FW_PATH_STA := "/vendor/etc/firmware/fw_bcm4329.bin" WIFI_DRIVER_FW_PATH_P2P := "/vendor/etc/firmware/fw_bcm4329_p2p.bin" WIFI_DRIVER_FW_PATH_AP := "/vendor/etc/firmware/fw_bcm4329_apsta.bin" BOARD_HAVE_BLUETOOTH := true-BOARD_HAVE_BLUETOOTH_BCM := true+BOARD_HAVE_BLUETOOTH_BCM := false BOARD_HAVE_BLUETOOTH_RTK := true BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR ?= device/rockchip/$(TARGET_BOARD_PLATFORM)/bluetooth endif2.3 libbt-vendor.so的配置
在hardware/realtek目录：HAL层添加蓝牙协议栈的代码和对应的libbt-vendor.so的源代码，libbt-vendor完成对蓝牙模块硬件初始化与控制（物理通讯接口初始化，固件下载，供电控制）
@sw-eng:RK3588S$ cd hardware/realtek/rtkbt/vendor/firmware@sw-eng:firmware$ @sw-eng:firmware$ lsBT_Firmware.mk rtl8723a_fw rtl8723c_fw rtl8723f_config rtl8761at_config rtl8761cs_fw rtl8822bs_configfw_info.txt rtl8723as_config rtl8723cs_cg_config rtl8723f_fw rtl8761at_fw rtl8821a_config rtl8822bs_fwreadme.txt rtl8723as_fw rtl8723cs_cg_fw rtl8723fs_config rtl8761au8192ee_fw rtl8821a_fw rtl8822c_configrtl8703as_config rtl8723b_config rtl8723cs_vf_config rtl8723fs_fw rtl8761au8812ae_fw rtl8821as_config rtl8822c_fwrtl8703as_fw rtl8723b_config_2Ant_S0 rtl8723cs_vf_fw rtl8725a_config rtl8761au_fw rtl8821as_fw rtl8822cs_configrtl8703bs_config rtl8723b_fw rtl8723cs_xx_config rtl8725a_fw rtl8761aw8192eu_config rtl8821c_config rtl8822cs_fwrtl8703bs_fw rtl8723bs_config rtl8723cs_xx_fw rtl8725as_config rtl8761aw8192eu_fw rtl8821c_fw rtl8852as_configrtl8703cs_config rtl8723bs_fw rtl8723d_config rtl8725as_fw rtl8761b_config rtl8821cs_config rtl8852as_fwrtl8703cs_fw rtl8723bs_VQ0_config rtl8723d_fw rtl8761a_config rtl8761b_fw rtl8821cs_fw rtl8852au_configrtl8723a_config rtl8723bs_VQ0_fw rtl8723ds_config rtl8761at8192ee_fw rtl8761bt_config rtl8822b_config rtl8852au_fwrtl8723a_config_addr rtl8723bu_config rtl8723ds_fw rtl8761at8812ae_fw rtl8761bt_fw rtl8822b_fwcfliu@sw-eng:firmware$ 最终会通过mk文件hardware/realtek/rtkbt/rtkbt.mk拷贝到机器的以下目录，打开蓝牙的时候会去加载fw：
ifeq ($(strip $(TARGET_BOARD_PLATFORM_PRODUCT)), tablet)BT_FIRMWARE_FILES := $(shell ls $(CUR_PATH)/vendor/firmware)PRODUCT_COPY_FILES += \$(foreach file, $(BT_FIRMWARE_FILES), $(CUR_PATH)/vendor/firmware/$(file):$(TARGET_COPY_OUT_VENDOR)/etc/firmware/$(file))最终拷贝到设备上为：/vendor/etc/firmware
pro:/vendor/etc/firmware # ls4343A0.hcd bcm4329.hcd fw_awnb108_ap.bin fw_bcm43438a0.bin fw_cyw43438.bin nvram_ap6212a.txt rtl8703bs_config rtl8723ds_config rtl8821a_fwAP6275P_NVRAM_V1.1_20200702.txt bcm43341b0.hcd fw_bcm40181a2.bin fw_bcm43438a0_apsta.bin fw_cyw43455.bin nvram_ap6214.txt rtl8703bs_fw rtl8723ds_fw rtl8821as_configBCM20710A1.hcd bcm4339a0.hcd fw_bcm40181a2_apsta.bin fw_bcm43438a0_p2p.bin fw_info.txt nvram_ap6214a.txt rtl8703cs_config rtl8723f_config rtl8821as_fwBCM4330B1.hcd bcm43438a0.hcd fw_bcm40183b2.bin fw_bcm43438a1.bin mali_csffw.bin nvram_ap6216.txt rtl8703cs_fw rtl8723f_fw rtl8821c_configBCM4343A0.hcd bcm43438a1.hcd fw_bcm40183b2_ag.bin fw_bcm43438a1_apsta.bin nh660.hcd nvram_ap6233f.txt rtl8723a_config rtl8723fs_config rtl8821c_fwBCM4343A1.hcd bcm4354a1.hcd fw_bcm40183b2_ag_apsta.bin fw_bcm43438a1_p2p.bin nvram.txt nvram_ap6236.txt rtl8723a_config_addr rtl8723fs_fw rtl8821cs_configBCM4343B0.hcd clm_bcm43752a2_ag.blob fw_bcm40183b2_ag_p2p.bin fw_bcm43455c0_ag.bin nvram_4330.txt nvram_ap6255.txt rtl8723a_fw rtl8725a_config rtl8821cs_fwBCM4345C0.hcd clm_bcm43752a2_pcie_ag.blob fw_bcm40183b2_apsta.bin fw_bcm43455c0_ag_apsta.bin nvram_4330_oob.txt nvram_ap6256.txt rtl8723as_config rtl8725a_fw rtl8822b_configBCM4345C5.hcd clm_bcm4375b4_pcie_ag.blob fw_bcm40183b2_p2p.bin fw_bcm43455c0_ag_p2p.bin nvram_AP6181.txt nvram_ap6275hh3.txt rtl8723as_fw rtl8725as_config rtl8822b_fwBCM4354A2.hcd config.txt fw_bcm43241b4_ag.bin fw_bcm43456c5_ag.bin nvram_AP6210.txt nvram_ap6275s.txt rtl8723b_config rtl8725as_fw rtl8822bs_configBCM4356A2.hcd esp32 fw_bcm43241b4_ag_apsta.bin fw_bcm43456c5_ag_apsta.bin nvram_AP6210_24M.txt nvram_ap62x2.txt rtl8723b_config_2Ant_S0 rtl8761a_config rtl8822bs_fwBCM4359C0.hcd fw_RK901.bin fw_bcm43241b4_ag_p2p.bin fw_bcm4354a1_ag.bin nvram_AP6234.txt nvram_ap6354.txt rtl8723b_fw rtl8761at8192ee_fw rtl8822c_configBCM4362A2.hcd fw_RK901a0.bin fw_bcm4330.bin fw_bcm4354a1_ag_apsta.bin nvram_AP6275P.txt nvram_ap6356.txt rtl8723bs_VQ0_config rtl8761at8812ae_fw rtl8822c_fwBCM4375B1.hcd fw_RK901a0_apsta.bin fw_bcm4330_apsta.bin fw_bcm4354a1_ag_p2p.bin nvram_AP6330.txt nvram_ap6356s.txt rtl8723bs_VQ0_fw rtl8761at_config rtl8822cs_configBT_Firmware.mk fw_RK901a2.bin fw_bcm43341b0_ag.bin fw_bcm4356a2_ag.bin nvram_AP6335.txt nvram_ap6398s.txt rtl8723bs_config rtl8761at_fw rtl8822cs_fwRT2870AP.dat fw_RK901a2_apsta.bin fw_bcm43341b0_ag_apsta.bin fw_bcm4356a2_ag_apsta.bin nvram_AP6441.txt nvram_ap6398sa.txt rtl8723bs_fw rtl8761au8192ee_fw rtl8852as_configRT2870APCard.dat fw_RK901a2_p2p.bin fw_bcm43341b0_ag_p2p.bin fw_bcm4356a2_ag_p2p.bin nvram_AP6476.txt nvram_ap6452.txt rtl8723bu_config rtl8761au8812ae_fw rtl8852as_fwRT2870STA.dat fw_RK903.bin fw_bcm4334b1_ag.bin fw_bcm4359c0_ag.bin nvram_AP6493.txt nvram_awnb108.txt rtl8723c_fw rtl8761au_fw rtl8852au_configRT2870STACard.dat fw_RK903_ag.bin fw_bcm4334b1_ag_apsta.bin fw_bcm4359c0_ag_apsta.bin nvram_B23.txt nvram_azw256.txt rtl8723cs_cg_config rtl8761aw8192eu_config rtl8852au_fwawnb108.hcd fw_RK903_ag_apsta.bin fw_bcm4334b1_ag_p2p.bin fw_bcm4359c0_ag_p2p.bin nvram_GB86302I.txt nvram_azw372.txt rtl8723cs_cg_fw rtl8761aw8192eu_fw ssv6051-sw.binbcm20710a1.hcd fw_RK903_ag_p2p.bin fw_bcm4339a0_ag.bin fw_bcm43752a2_ag.bin nvram_RK901.txt otp.bin.z77 rtl8723cs_vf_config rtl8761b_config ssv6051-wifi.cfgbcm20710a1_24M.hcd fw_RK903_p2p.bin fw_bcm4339a0_ag_apsta.bin fw_bcm43752a2_ag_apsta.bin nvram_RK903.cal readme.txt rtl8723cs_vf_fw rtl8761b_fw wifi_efuse_8189e.mapbcm20710a1_26M.hcd fw_RK903b2.bin fw_bcm4339a0_ag_p2p.bin fw_bcm43752a2_pcie_ag.bin nvram_RK903.txt rk903.hcd rtl8723cs_xx_config rtl8761bt_config wifi_efuse_8723bs-vq0.mapbcm2076b1.hcd fw_RK903b2_apsta.bin fw_bcm43436b0.bin fw_bcm43752a2_pcie_ag_apsta.bin nvram_RK903_26M.cal rk903_26M.hcd rtl8723cs_xx_fw rtl8761bt_fw wifi_efuse_8723cs.mapbcm40183b2.hcd fw_RK903b2_p2p.bin fw_bcm43436b0_apsta.bin fw_bcm4375b4_pcie_ag.bin nvram_WL211.txt rtl8703as_config rtl8723d_config rtl8761cs_fw wifi_efuse_8723ds.mapbcm43241b4.hcd fw_awnb108.bin fw_bcm43436b0_p2p.bin fw_bcm4375b4_pcie_ag_apsta.bin nvram_ap6212.txt rtl8703as_fw rtl8723d_fw rtl8821a_config wifi_efuse_8821cs.map2.4 根据type选择具体的vendor库
部分HAL层对应的libbt-vendor.so的源代码浅析：
首先是bluedroid 蓝牙协议栈libbt-hci【原生蓝牙协议栈】通过system/bt/hci/src/hci_layer_android.cc的hci_initialize函数，调用interfaces/bluetooth/1.0/default/vendor_interface.cc中的initialize函数，进而调用open函数打开对应so库。
//interfaces/bluetooth/1.0/default/vendor_interface.ccstatic const char* VENDOR_LIBRARY_NAME = "libbt-vendor.so";static const char* VENDOR_REALTEK_LIBRARY_NAME = "libbt-vendor-realtek.so";static char wifi_type[64] = {0};extern "C" int check_wifi_chip_type_string(char *type);bool VendorInterface::Open(InitializeCompleteCallback initialize_complete_cb, PacketReadCallback event_cb, PacketReadCallback acl_cb, PacketReadCallback sco_cb, PacketReadCallback iso_cb) { initialize_complete_cb_ = initialize_complete_cb; char vendor_lib_name[32]; // Initialize vendor interface if (wifi_type[0] == 0) //获取当前wifi芯片的type加载不同的so库，目前这个接口有权限问题，待进一步分析 check_wifi_chip_type_string(wifi_type); if ((0 == strncmp(wifi_type, "RTL", 3)) || (0 == strncmp(wifi_type, "SSV", 3))) { // for ssv6051 wifi + rtl8761 bt //此时加载的是libbt-vendor-realtek.so strcpy(vendor_lib_name, VENDOR_REALTEK_LIBRARY_NAME); } else { //此时加载的是libbt-vendor.so strcpy(vendor_lib_name, VENDOR_LIBRARY_NAME); } ALOGD("%s: %s", __func__, vendor_lib_name); lib_handle_ = dlopen(vendor_lib_name, RTLD_NOW); if (!lib_handle_) { ALOGE("%s unable to open %s (%s)", __func__, vendor_lib_name, dlerror()); return false; } lib_interface_ = reinterpret_cast<bt_vendor_interface_t*>( dlsym(lib_handle_, VENDOR_LIBRARY_SYMBOL_NAME)); if (!lib_interface_) { ALOGE("%s unable to find symbol %s in %s (%s)", __func__, VENDOR_LIBRARY_SYMBOL_NAME, vendor_lib_name, dlerror()); return false; } // Get the local BD address uint8_t local_bda[BluetoothAddress::kBytes]; //获取本地的蓝牙地址 if (!BluetoothAddress::get_local_address(local_bda)) { LOG_ALWAYS_FATAL("%s: No Bluetooth Address!", __func__); } //接口的初始化 int status = lib_interface_->init(&lib_callbacks, (unsigned char*)local_bda); if (status) { ALOGE("%s unable to initialize vendor library: %d", __func__, status); return false; } ALOGD("%s vendor library loaded", __func__); // Power on the controller int power_state = BT_VND_PWR_ON; lib_interface_->op(BT_VND_OP_POWER_CTRL, &power_state); // Get the UART socket(s) int fd_list[CH_MAX] = {0}; int fd_count = lib_interface_->op(BT_VND_OP_USERIAL_OPEN, &fd_list); if (fd_count < 1 || fd_count > CH_MAX - 1) { ALOGE("%s: fd_count %d is invalid!", __func__, fd_count); return false; } for (int i = 0; i < fd_count; i++) { if (fd_list[i] == INVALID_FD) { ALOGE("%s: fd %d is invalid!", __func__, fd_list[i]); return false; } } event_cb_ = event_cb; PacketReadCallback intercept_events = [this](const hidl_vec<uint8_t>& event) { HandleIncomingEvent(event); }; if (fd_count == 1) { hci::H4Protocol* h4_hci = new hci::H4Protocol(fd_list[0], intercept_events, acl_cb, sco_cb, iso_cb); fd_watcher_.WatchFdForNonBlockingReads( fd_list[0], [h4_hci](int fd) { h4_hci->OnDataReady(fd); }); hci_ = h4_hci; } else { hci::MctProtocol* mct_hci = new hci::MctProtocol(fd_list, intercept_events, acl_cb); fd_watcher_.WatchFdForNonBlockingReads( fd_list[CH_EVT], [mct_hci](int fd) { mct_hci->OnEventDataReady(fd); }); fd_watcher_.WatchFdForNonBlockingReads( fd_list[CH_ACL_IN], [mct_hci](int fd) { mct_hci->OnAclDataReady(fd); }); hci_ = mct_hci; } // Initially, the power management is off. lpm_wake_deasserted = true; // Start configuring the firmware //配置和加载Firmware firmware_startup_timer_ = new FirmwareStartupTimer(); lib_interface_->op(BT_VND_OP_FW_CFG, nullptr); return true;}2.5 协议栈的选择
system/bt目录下，蓝牙协议栈代码和加载libbt-vendor.so库的代码，通常情况下建议使用原生的蓝牙协议栈【在system/bt目录】，如果有厂商的协议栈对原生协议栈做过较大的修正而必须使用厂商自己的协议栈的情况下在 jni 层完成对不同厂商协议栈【一般在hardware目录下】的加载
//packages/apps/Bluetooth/jni/com_android_bluetooth_btservice_AdapterService.cppstatic void classInitNative(JNIEnv* env, jclass clazz) { ...... char type[64]; check_wifi_chip_type_string(type); if (!strncmp(type, "RTL", 3)) { //加载rtl厂商对应的蓝牙协议栈的库：bluetooth_rtk.default.so ALOGD("%s, load %s.default.so", __func__, BT_STACK_RTK_MODULE_ID); err = hw_get_module(BT_STACK_RTK_MODULE_ID, (hw_module_t const**)&module); } else { //加载原生的蓝牙协议栈的库：bluetooth.default.so ALOGD("%s, load %s.default.so", __func__, id); err = hw_get_module(id, (hw_module_t const**)&module); }}//处理一些回调const bt_vendor_callbacks_t lib_callbacks = { sizeof(lib_callbacks), firmware_config_cb, sco_config_cb, low_power_mode_cb, sco_audiostate_cb, buffer_alloc_cb, buffer_free_cb, transmit_cb, epilog_cb, a2dp_offload_cb};} // namespace//BT_STACK_RTK_MODULE_ID在./hardware/libhardware/include/hardware/bluetooth.h定义三、相关日志
3.1 Kernel相关日志
//USB识别设备类型pid,vid以及序列号等02-24 14:08:54.866 I/KERNEL: usb 4-1.1( 7855): New USB device found, idVendor=0bda, idProduct=d723, bcdDevice= 2.0002-24 14:08:54.866 I/KERNEL: usb 4-1.1( 7855): New USB device strings: Mfr=1, Product=2, SerialNumber=302-24 14:08:54.866 I/KERNEL: usb 4-1.1( 7855): Product: 802.11n WLAN Adapter02-24 14:08:54.866 I/KERNEL: usb 4-1.1( 7855): Manufacturer: Realtek02-24 14:08:54.866 I/KERNEL: usb 4-1.1( 7855): SerialNumber: 00e04c000001//Realtk驱动加载已经装载firmware信息02-24 14:08:54.869 I/KERNEL: rtk_btusb( 7855): btusb_probe: usb_interface 00000000a7ea3647, bInterfaceNumber 0, idVendor 0x0bda, idProduct 0x000002-24 14:08:54.869 I/KERNEL: rtk_btusb( 7855): get_fw_table_entry: Product id = 0xd723, fw table entry size 7102-24 14:08:54.870 I/KERNEL: rtk_btusb( 7855): firmware_info_init: Auto suspend is disabled02-24 14:08:54.870 I/KERNEL: rtk_btusb( 7855): btusb_probe: Check bt reset flag 002-24 14:08:54.870 I/KERNEL: rtk_btusb( 7855): load_firmware_info: Default lmp version = 0x8723, fw file name[rtl8723d_fw]02-24 14:08:54.870 I/KERNEL: rtk_btusb( 7855): load_firmware_info: epatch_buf = vmalloc(fw->size, GFP_KERNEL)02-24 14:08:55.152 I/KERNEL: rtk_btusb( 7855): get_eversion: status 0, eversion 202-24 14:08:55.152 I/KERNEL: rtk_btusb( 7855): load_firmware_info: Default lmp_version 0x8723, project_id[9] 0x8723 -> match3.2 应用侧和framework相关日志
02-24 14:09:01.039 D/BluetoothManagerService( 797): enable(com.android.dten.settings): mBluetooth =null mBinding = false mState = OFF02-24 14:09:01.039 D/BluetoothManagerService( 797): enable returning02-24 14:09:01.039 D/BluetoothManagerService( 797): binding Bluetooth service02-24 14:09:01.040 D/BluetoothA2dp( 1770): Binding service...02-24 14:09:01.041 D/BluetoothHidHost( 1770): Binding service...//加载协议栈libbluetooth.so库02-24 14:09:01.091 I/BluetoothServiceJni( 9618): hal_util_load_bt_library: loaded Bluetooth library successfully02-24 14:09:01.117 D/BluetoothManagerService( 797): MESSAGE_BLUETOOTH_STATE_CHANGE: OFF > BLE_TURNING_ON02-24 14:09:01.117 D/BluetoothManagerService( 797): Sending BLE State Change: OFF > BLE_TURNING_ON3.3 协议栈libbluetooth/libbt_hci日志
//协议栈初始化以及消息线程的处理02-24 14:09:01.104 I/bt_btif ( 9618): system/bt/btif/src/bluetooth.cc:162 init: init: start restricted = 0 ; common criteria mode = 0, config compare result = 002-24 14:09:01.105 I/droid.bluetoot( 9618): [0224/140901.105332:INFO:message_loop_thread.cc(224)] Run: message loop starting for thread bt_stack_manager_thread02-24 14:09:01.105 I/bt_stack_manager( 9618): system/bt/btif/src/stack_manager.cc:210 event_init_stack: is initializing the stack02-24 14:09:01.106 I/bt_btif_core( 9618): system/bt/btif/src/btif_core.cc:235 btif_init_bluetooth: btif_init_bluetooth entered02-24 14:09:01.106 I/bt_stack_manager( 9618): system/bt/btif/src/stack_manager.cc:233 event_init_stack: finished//hci协议层初始化，并且调用hardware下HDIL接口02-24 14:09:01.135 I/bt_hci ( 9618): system/bt/hci/src/hci_layer.cc:200 hci_module_start_up: hci_module_start_up02-24 14:09:01.135 I/bt_hci ( 9618): system/bt/hci/src/hci_layer_android.cc:159 hci_initialize: hci_initialize02-24 14:09:01.136 I/bt_hci ( 9618): system/bt/hci/src/hci_layer_android.cc:178 hci_initialize: hci_initialize: IBluetoothHci::getService() returned 0xb400006ff7a7d390 (remote)02-24 14:09:01.136 I/android.hardware.bluetooth@1.0-impl( 9496): BluetoothHci::initialize()3.4 HDIL接口相关日志
02-24 14:09:01.136 I/android.hardware.bluetooth@1.0-impl( 9496): BluetoothHci::initialize()//根据type来决定加载不同的so库02-24 14:09:01.137 E/android.hardware.bluetooth@1.0-service( 9496): check_wifi_chip_type_string : APXXX: Permission denied//打开libbt-vendor.so来配置端口，上下电，firmware的加载等02-24 14:09:01.137 D/android.hardware.bluetooth@1.0-impl( 9496): Open: libbt-vendor.so02-24 14:09:01.138 E/android.hardware.bluetooth@1.0-service( 9496): vendor storage read error02-24 14:09:01.138 D/android.hardware.bluetooth@1.0-service( 9496): get_local_address: Trying /data/misc/bluetooth/bdaddr// libbt_verdor库中处理，获取版本信息，日志开关等等02-24 14:09:01.138 I/libbt_vendor( 9496): RTKBT_RELEASE_NAME: 20201130_BT_ANDROID_11.002-24 14:09:01.138 I/libbt_vendor( 9496): init02-24 14:09:01.138 I/rtk_parse( 9496): RTKBT_RELEASE_NAME: 20200318_BT_ANDROID_10.002-24 14:09:01.138 E/libbt_vendor( 9496): rtk_btsnoop_dump = 0, rtk_btsnoop_save_log = 002-24 14:09:01.138 D/android.hardware.bluetooth@1.0-impl( 9496): Open vendor library loaded//设置电源管理情况，先下电在上电02-24 14:09:01.338 D/libbt_vendor( 9496): set power off and delay 200ms02-24 14:09:02.339 D/libbt_vendor( 9496): set power on and delay 1000ms02-24 14:09:02.339 D/libbt_vendor( 9496): USB op for 302-24 14:09:02.339 I/bt_userial_vendor( 9496): device fd = 8 open02-24 14:09:02.339 D/bt_service( 9496): OsAllocateTimer bt_service sigev.sigev_notify_thread_id = syscall(__NR_gettid)!02-24 14:09:02.339 D/bt_service( 9496): RTK_btservice_init init done!//驱动打开USB设备02-24 14:09:03.814 I/KERNEL: DTEN( 182): HW_INFO:time:2023-2-24 6:9:3.02-24 14:09:04.111 I/KERNEL: rtk_btusb( 9498): btchr_open: BT usb char device is opening02-24 14:09:04.112 I/KERNEL: rtk_btusb( 9498): btchr_ioctl with Cmd:-2147203660//libbt_verdor对设备的firmware的配置，以及信息的获取02-24 14:09:02.601 D/bt_hwcfg_usb( 9496): RTKBT_RELEASE_NAME: 20201130_BT_ANDROID_11.002-24 14:09:02.601 D/bt_hwcfg_usb( 9496): 02-24 14:09:02.601 D/bt_hwcfg_usb( 9496): Realtek libbt-vendor_usb Version 5.1.1 02-24 14:09:02.601 D/bt_hwcfg_usb( 9496): hw_usb_config_start, transtype = 0x20, pid = 0xd723, vid = 0x0bda 02-24 14:09:04.373 I/KERNEL: rtk_btusb( 9498): btusb_open: Start, PM usage count 002-24 14:09:04.373 I/KERNEL: rtk_btusb( 9498): btusb_open: End, PM usage count 002-24 14:09:02.610 D/bt_hwcfg_usb( 9496): hw_cfg_cb.state = 902-24 14:09:02.911 D/bt_hwcfg_usb( 9496): hw_cfg_cb.state = 202-24 14:09:02.911 I/bt_hwcfg_usb( 9496): BT config file: /vendor/etc/firmware/rtl8723d_config02-24 14:09:02.911 D/bt_hwcfg_usb( 9496): bt_addr = 002-24 14:09:02.911 I/bt_hwcfg_usb( 9496): config offset(0xe4),length(0x1)//装载固件成功02-24 14:09:02.911 I/bt_hwcfg( 9496): BT fw file: /vendor//etc/firmware/rtl8723d_fw02-24 14:09:02.911 I/bt_hwcfg( 9496): Load FW OK//解析firmware以及rtl8723d_config的信息02-24 14:09:02.911 D/bt_hwcfg_usb( 9496): lmp_subversion = 0x8723 hw_cfg_cb.hci_version = 0x8 hw_cfg_cb.hci_revision = 0xd, hw_cfg_cb.lmp_sub_current = 0x4b4a02-24 14:09:02.911 D/bt_hwcfg_usb( 9496): hw_usb_config_cback: Cold BT controller startup02-24 14:09:02.912 D/bt_hwcfg_usb( 9496): hw_cfg_cb.state = 302-24 14:09:02.912 D/bt_hwcfg_usb( 9496): hw_usb_config_cback chip_id of the IC:302-24 14:09:02.912 E/bt_hwcfg_usb( 9496): update altsettings02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): ORG Config len=0000000a:02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): 00000000: 55 ab 23 87 04 00 e4 00 01 08 00 00 00 00 00 0002-24 14:09:02.912 I/bt_hwcfg_usb( 9496): Couldn't open extra config /vendor/etc/bluetooth/rtk_btconfig.txt, err:No such file or directory02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): rtk_update_altsettings: 1 AltSettings02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): MAC: 22:22:2b:2c:02:0002-24 14:09:02.912 I/bt_hwcfg_usb( 9496): rtk_update_altsettings: add 0044[06]02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): NEW Config len=00000013:02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): 00000000: 55 ab 23 87 0d 00 e4 00 01 08 44 00 06 00 02 2c02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): 00000010: 2b 22 22 00 00 00 00 00 00 00 00 00 00 00 00 0002-24 14:09:02.912 I/bt_hwcfg( 9496): bt_hw_parse_project_id: opcode 0, len 1, data 902-24 14:09:02.912 I/bt_hwcfg( 9496): rtk_get_patch_entry: fw_ver 0x829a4b4a, patch_num 302-24 14:09:02.912 I/bt_hwcfg( 9496): rtk_get_patch_entry: chip_id 3, patch_len 0x7ea0, patch_offset 0x494002-24 14:09:02.912 I/bt_hwcfg_usb( 9496): total_len = 0x7eb302-24 14:09:02.912 I/bt_hwcfg_usb( 9496): BTCOEX:20200103-3535 svn_version:24232 lmp_subversion:0x8723 hci_version:0x8 hci_revision:0xd chip_type:31 Cut:3 libbt-vendor_uart version:5.1.1, patch->fw_version = 829a4b4a02-24 14:09:02.912 I/bt_hwcfg_usb( 9496): Fw: exists, config file: exists02-24 14:09:02.912 D/bt_hwcfg_usb( 9496): Check total_len(0x00007eb3) max_patch_size(0x0000a000)//总共129条02-24 14:09:02.912 D/bt_hwcfg_usb( 9496): patch fragment count 129, tail len 17902-24 14:09:02.913 D/bt_hwcfg_usb( 9496): bt vendor lib: HW_CFG_DL_FW_PATCH status:0, opcode:0xfc2002-24 14:09:02.913 D/bt_hwcfg_usb( 9496): bt vendor lib: HW_CFG_DL_FW_PATCH status:0, iIndexRx:0....02-24 14:09:03.170 D/bt_hwcfg_usb( 9496): bt vendor lib: HW_CFG_DL_FW_PATCH status:0, opcode:0xfc2002-24 14:09:03.170 D/bt_hwcfg_usb( 9496): bt vendor lib: HW_CFG_DL_FW_PATCH status:0, iIndexRx:12902-24 14:09:03.170 D/bt_hwcfg_usb( 9496): vendor lib fwcfg completed//HDIL的相关回调02-24 14:09:03.170 D/android.hardware.bluetooth@1.0-impl( 9496): OnFirmwareConfigured result: 002-24 14:09:03.170 I/android.hardware.bluetooth@1.0-impl( 9496): Firmware configured in 0.831s02-24 14:09:03.170 I/android.hardware.bluetooth@1.0-impl( 9496): OnFirmwareConfigured: lpm_timeout_ms 002-24 14:09:03.170 D/android.hardware.bluetooth@1.0-impl( 9496): OnFirmwareConfigured Calling StartLowPowerWatchdog()//Kernel io接口OK02-24 14:09:04.943 I/KERNEL: rtk_btusb( 9722): btchr_ioctl with Cmd:107402181102-24 14:09:04.943 I/KERNEL: rtk_btusb( 9722): btchr_ioctl lmp_sub = 0x4b4a, patch_entry->lmp_sub = 0x4b4a02-24 14:09:03.202 E/bt_userial_vendor( 9496): set event mask, it should bt stack init, set coex bt on//rtk心跳相关配置和初始化02-24 14:09:03.202 D/rtk_heartbeat( 9496): Heartbeat_init start02-24 14:09:03.202 E/rtk_heartbeat( 9496): load_rtkbt_heartbeat_conf unable to open file '/vendor/etc/bluetooth/rtkbt_heartbeat.conf': No such file or directory02-24 14:09:03.202 D/rtk_heartbeat( 9496): Heartbeat_init res = 002-24 14:09:03.202 D/rtk_heartbeat( 9496): Heartbeat_init end四、遗留问题
4.1 芯片type获取异常
目前通过check_wifi_chip_type_string这个接口获取提示有权限问题，因此调试RTL8723DU时候，是将BCM的宏是关掉了的。后面如果check_wifi_chip_type_string这个接口ok，BCM宏默认是可以打开做兼容处理。下面需要加日志具体分析check_wifi_chip_type_string接口返回异常的问题。
4.2 USB蓝牙适配器SCO模式不工作问题
耳机正常配对连接过A2DP模式可以正常工作，因为不需要注册声卡，走的是蓝牙本身协议；而SCO走的是pcm流需要通过ALSA走声卡的流程。目前测试看声卡用的是原生的card 2，device 0是针对BCM芯片拐角的配置，因此USB蓝牙适配器的声卡需要自己注册，而且需要将USB的数据转为PCM处理。
4.3 开会强制使用A2DP
为了开会使用蓝牙耳机，先强制在开会时候使用A2DP模式，Mic使用本机local的mic。而开会使用SCO模式主要调用以下几个接口：
//audioManager.java//开启sco模式void startBluetoothSco()void startBluetoothScoVirtualCall()//停止sco模式void stopBluetoothSco()//是否使用本机speakervoid setSpeakerphoneOn(boolean on)//通知hal层进行模式和设备选择void setMode(@AudioMode int mode)//设置communication的设备，替代传统的方式startBluetoothSco/stopBluetoothSco/setSpeakerphoneOnboolean setCommunicationDevice(@NonNull AudioDeviceInfo device)强制使能A2DP，则将上述接口屏蔽即可。这里简单说下新增接口setCommunicationDevice的用法
//The example below shows how to enable and disable speakerphone mode. // Get an AudioManager instance AudioManager audioManager = Context.getSystemService(AudioManager.class); AudioDeviceInfo speakerDevice = null; List<AudioDeviceInfo> devices = audioManager.getAvailableCommunicationDevices(); for (AudioDeviceInfo device : devices) { if (device.getType() == AudioDeviceInfo.TYPE_BUILTIN_SPEAKER) { speakerDevice = device; break; } } if (speakerDevice != null) { // Turn speakerphone ON. boolean result = audioManager.setCommunicationDevice(speakerDevice); if (!result) { // Handle error. } // Turn speakerphone OFF. audioManager.clearCommunicationDevice(); }来源地址：https://blog.csdn.net/franc521/article/details/130103992
