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【android bluetooth 协议分析 05】【蓝牙连接详解2】【acl_interface_t介绍】

news 2025/6/27 2:41:03

1. acl_interface_t 介绍

acl_interface_t 结构体及其子结构体，目的是封装处理 Classic、LE、SCO 连接及链路事件的回调函数，用于 HCI 事件与上层蓝牙协议栈的解耦分发。

  • system/main/shim/acl_legacy_interface.h
typedef struct {void (*on_connected)(const RawAddress& bda, uint16_t handle,uint8_t enc_mode);void (*on_failed)(const RawAddress& bda, tHCI_STATUS status);void (*on_disconnected)(tHCI_STATUS status, uint16_t handle,tHCI_STATUS reason);
} acl_classic_connection_interface_t;typedef struct {void (*on_connected)(const tBLE_BD_ADDR& address_with_type, uint16_t handle,tHCI_ROLE role, uint16_t conn_interval,uint16_t conn_latency, uint16_t conn_timeout,const RawAddress& local_rpa, const RawAddress& peer_rpa,tBLE_ADDR_TYPE peer_addr_type);void (*on_failed)(const tBLE_BD_ADDR& address_with_type, uint16_t handle,bool enhanced, tHCI_STATUS status);void (*on_disconnected)(tHCI_STATUS status, uint16_t handle,tHCI_STATUS reason);void (*on_iso_disconnected)(uint16_t handle, tHCI_STATUS reason);
} acl_le_connection_interface_t;typedef struct {void (*on_esco_connect_request)(const RawAddress&,const types::ClassOfDevice&);void (*on_sco_connect_request)(const RawAddress&,const types::ClassOfDevice&);void (*on_disconnected)(uint16_t handle, tHCI_REASON reason);
} acl_sco_connection_interface_t;typedef struct {void (*on_authentication_complete)(uint16_t handle, tHCI_STATUS status);void (*on_change_connection_link_key_complete)();void (*on_encryption_change)(bool enabled);void (*on_flow_specification_complete)(uint16_t flow_direction,uint16_t service_type,uint32_t token_rate,uint32_t token_bucket_size,uint32_t peak_bandwidth,uint32_t access_latency);void (*on_flush_occurred)();void (*on_central_link_key_complete)(uint8_t key_flag);void (*on_mode_change)(tHCI_STATUS status, uint16_t handle,tHCI_MODE current_mode, uint16_t interval);void (*on_sniff_subrating)(tHCI_STATUS status, uint16_t handle,uint16_t maximum_transmit_latency,uint16_t maximum_receive_latency,uint16_t minimum_remote_timeout,uint16_t minimum_local_timeout);void (*on_packet_type_changed)(uint16_t packet_type);void (*on_qos_setup_complete)(uint16_t service_type, uint32_t token_rate,uint32_t peak_bandwidth, uint32_t latency,uint32_t delay_variation);void (*on_read_afh_channel_map_complete)(uint8_t afh_mode,uint8_t afh_channel_map[]);void (*on_read_automatic_flush_timeout_complete)(uint16_t flush_timeout);void (*on_read_clock_complete)(uint32_t clock, uint16_t accuracy);void (*on_read_clock_offset_complete)(uint16_t clock_offset);void (*on_read_failed_contact_counter_complete)(uint16_t failed_contact_counter);void (*on_read_link_policy_settings_complete)(uint16_t link_policy_settings);void (*on_read_link_quality_complete)(uint8_t link_quality);void (*on_read_link_supervision_timeout_complete)(uint16_t link_supervision_timeout);void (*on_read_remote_supported_features_complete)(uint16_t handle,uint64_t features);void (*on_read_remote_extended_features_complete)(uint16_t handle,uint8_t current_page_number,uint8_t max_page_number,uint64_t features);void (*on_read_remote_version_information_complete)(tHCI_STATUS status, uint16_t handle, uint8_t lmp_version,uint16_t manufacturer_name, uint16_t sub_version);void (*on_read_rssi_complete)(uint8_t rssi);void (*on_read_transmit_power_level_complete)(uint8_t transmit_power_level);void (*on_role_change)(tHCI_STATUS status, const RawAddress& bd_addr,tHCI_ROLE new_role);void (*on_role_discovery_complete)(tHCI_ROLE current_role);
} acl_classic_link_interface_t;typedef struct {void (*on_connection_update)(tHCI_STATUS status, uint16_t handle,uint16_t connection_interval,uint16_t connection_latency,uint16_t supervision_timeout);void (*on_data_length_change)(uint16_t handle, uint16_t max_tx_octets,uint16_t max_tx_time, uint16_t max_rx_octets,uint16_t max_rx_time);void (*on_read_remote_version_information_complete)(tHCI_STATUS status, uint16_t handle, uint8_t lmp_version,uint16_t manufacturer_name, uint16_t sub_version);void (*on_phy_update)(tGATT_STATUS status, uint16_t handle, uint8_t tx_phy,uint8_t rx_phy);
} acl_le_link_interface_t;typedef struct {acl_classic_connection_interface_t classic;acl_le_connection_interface_t le;acl_sco_connection_interface_t sco;
} acl_connection_interface_t;typedef struct {acl_classic_link_interface_t classic;acl_le_link_interface_t le;
} acl_link_interface_t;typedef struct {void (*on_send_data_upwards)(BT_HDR*);void (*on_packets_completed)(uint16_t handle, uint16_t num_packets);acl_connection_interface_t connection;acl_link_interface_t link;
} acl_interface_t;

2. 总体结构图

acl_interface_t
├── void (*on_send_data_upwards)(BT_HDR*)
├── void (*on_packets_completed)(uint16_t handle, uint16_t num_packets)
├── acl_connection_interface_t connection
│   ├── acl_classic_connection_interface_t classic
│   ├── acl_le_connection_interface_t le
│   └── acl_sco_connection_interface_t sco
└── acl_link_interface_t link├── acl_classic_link_interface_t classic└── acl_le_link_interface_t le

3. 每个结构体及函数指针用途说明

1. acl_interface_t

typedef struct {void (*on_send_data_upwards)(BT_HDR*);void (*on_packets_completed)(uint16_t handle, uint16_t num_packets);acl_connection_interface_t connection;acl_link_interface_t link;
} acl_interface_t;

顶层接口，作为 shim 层对上提供的主入口，包含连接建立和链路管理的分发处理。

  • on_send_data_upwards: 当有 ACL 数据包（BT_HDR）需要上传到上层时调用，例如传递 L2CAP 数据。

  • on_packets_completed: 通知上层,控制器完成多少包的发送（ACL 信道流控机制）。

2. acl_connection_interface_t

处理连接建立/断开的事件（包括 Classic、LE、SCO 三种类型）。

typedef struct {acl_classic_connection_interface_t classic;acl_le_connection_interface_t le;acl_sco_connection_interface_t sco;
} acl_connection_interface_t;

1.acl_classic_connection_interface_t

用于处理 Classic ACL 连接建立/失败/断开等事件。

typedef struct {void (*on_connected)(const RawAddress& bda, uint16_t handle,uint8_t enc_mode);void (*on_failed)(const RawAddress& bda, tHCI_STATUS status);void (*on_disconnected)(tHCI_STATUS status, uint16_t handle,tHCI_STATUS reason);
} acl_classic_connection_interface_t;
函数名使用场景
on_connected控制器报告 BR/EDR（Classic）连接成功时调用。
on_failedClassic 连接失败（如超时、被拒）时调用。
on_disconnectedClassic ACL 断开时调用，带有断开原因。

2.acl_le_connection_interface_t

用于处理 BLE 连接建立/断开等事件。

typedef struct {void (*on_connected)(const tBLE_BD_ADDR& address_with_type, uint16_t handle,tHCI_ROLE role, uint16_t conn_interval,uint16_t conn_latency, uint16_t conn_timeout,const RawAddress& local_rpa, const RawAddress& peer_rpa,tBLE_ADDR_TYPE peer_addr_type);void (*on_failed)(const tBLE_BD_ADDR& address_with_type, uint16_t handle,bool enhanced, tHCI_STATUS status);void (*on_disconnected)(tHCI_STATUS status, uint16_t handle,tHCI_STATUS reason);void (*on_iso_disconnected)(uint16_t handle, tHCI_STATUS reason);
} acl_le_connection_interface_t;
函数名使用场景
on_connectedBLE 连接成功，包括 handle、间隔、latency 等参数。
on_failedBLE 连接失败，包括是否 enhanced 和失败状态。
on_disconnectedBLE ACL 断开时调用。
on_iso_disconnectedLE-ISO（如 CIS/BIS）断开事件。

3.acl_sco_connection_interface_t

用于 SCO/eSCO 音频连接的请求和断开事件处理。

typedef struct {void (*on_esco_connect_request)(const RawAddress&,const types::ClassOfDevice&);void (*on_sco_connect_request)(const RawAddress&,const types::ClassOfDevice&);void (*on_disconnected)(uint16_t handle, tHCI_REASON reason);
} acl_sco_connection_interface_t;
函数名使用场景
on_sco_connect_request对方发起 SCO 音频连接请求。
on_esco_connect_request对方发起 eSCO 音频连接请求。
on_disconnectedSCO 音频通道断开时。

3. acl_link_interface_t

处理已经建立连接后的 链路状态管理与信息读取。

typedef struct {acl_classic_link_interface_t classic;acl_le_link_interface_t le;
} acl_link_interface_t;

1.acl_classic_link_interface_t

Classic BR/EDR 的链路层事件处理。

typedef struct {void (*on_authentication_complete)(uint16_t handle, tHCI_STATUS status);void (*on_change_connection_link_key_complete)();void (*on_encryption_change)(bool enabled);void (*on_flow_specification_complete)(uint16_t flow_direction,uint16_t service_type,uint32_t token_rate,uint32_t token_bucket_size,uint32_t peak_bandwidth,uint32_t access_latency);void (*on_flush_occurred)();void (*on_central_link_key_complete)(uint8_t key_flag);void (*on_mode_change)(tHCI_STATUS status, uint16_t handle,tHCI_MODE current_mode, uint16_t interval);void (*on_sniff_subrating)(tHCI_STATUS status, uint16_t handle,uint16_t maximum_transmit_latency,uint16_t maximum_receive_latency,uint16_t minimum_remote_timeout,uint16_t minimum_local_timeout);void (*on_packet_type_changed)(uint16_t packet_type);void (*on_qos_setup_complete)(uint16_t service_type, uint32_t token_rate,uint32_t peak_bandwidth, uint32_t latency,uint32_t delay_variation);void (*on_read_afh_channel_map_complete)(uint8_t afh_mode,uint8_t afh_channel_map[]);void (*on_read_automatic_flush_timeout_complete)(uint16_t flush_timeout);void (*on_read_clock_complete)(uint32_t clock, uint16_t accuracy);void (*on_read_clock_offset_complete)(uint16_t clock_offset);void (*on_read_failed_contact_counter_complete)(uint16_t failed_contact_counter);void (*on_read_link_policy_settings_complete)(uint16_t link_policy_settings);void (*on_read_link_quality_complete)(uint8_t link_quality);void (*on_read_link_supervision_timeout_complete)(uint16_t link_supervision_timeout);void (*on_read_remote_supported_features_complete)(uint16_t handle,uint64_t features);void (*on_read_remote_extended_features_complete)(uint16_t handle,uint8_t current_page_number,uint8_t max_page_number,uint64_t features);void (*on_read_remote_version_information_complete)(tHCI_STATUS status, uint16_t handle, uint8_t lmp_version,uint16_t manufacturer_name, uint16_t sub_version);void (*on_read_rssi_complete)(uint8_t rssi);void (*on_read_transmit_power_level_complete)(uint8_t transmit_power_level);void (*on_role_change)(tHCI_STATUS status, const RawAddress& bd_addr,tHCI_ROLE new_role);void (*on_role_discovery_complete)(tHCI_ROLE current_role);
} acl_classic_link_interface_t;
函数名使用场景
on_authentication_complete认证过程完成时。
on_change_connection_link_key_complete改变连接密钥完成时。
on_encryption_change加密状态改变。
on_flow_specification_completeQoS flow 配置结果。
on_flush_occurred数据 flush 完成通知。
on_mode_changesniff/hold 等模式变更。
on_sniff_subratingSniff 子速率设置结果。
on_read_rssi_completeRSSI 读取完成。
on_read_link_quality_completeLink quality 查询结果。
on_role_change主从角色切换事件。

注：许多函数与 HCI command complete 或 HCI event 对应，例如 HCI_READ_REMOTE_VERSION_INFORMATION, HCI_READ_LINK_QUALITY。

2.acl_le_link_interface_t

BLE 链路状态的事件回调。

typedef struct {void (*on_connection_update)(tHCI_STATUS status, uint16_t handle,uint16_t connection_interval,uint16_t connection_latency,uint16_t supervision_timeout);void (*on_data_length_change)(uint16_t handle, uint16_t max_tx_octets,uint16_t max_tx_time, uint16_t max_rx_octets,uint16_t max_rx_time);void (*on_read_remote_version_information_complete)(tHCI_STATUS status, uint16_t handle, uint8_t lmp_version,uint16_t manufacturer_name, uint16_t sub_version);void (*on_phy_update)(tGATT_STATUS status, uint16_t handle, uint8_t tx_phy,uint8_t rx_phy);
} acl_le_link_interface_t;
函数名使用场景
on_connection_update连接参数更新完成。
on_data_length_change数据包最大长度变化（DLE）。
on_read_remote_version_information_complete查询 BLE peer 版本信息。
on_phy_updatePHY 层更新结果（1M/2M/Coded）。

4.小结

模块结构体用途
连接管理acl_classic_connection_interface_t处理 Classic 连接建立/失败/断开
连接管理acl_le_connection_interface_t处理 BLE 连接建立/失败/断开（含 ISO）
连接管理acl_sco_connection_interface_t处理 SCO/eSCO 连接请求及断开
链路管理acl_classic_link_interface_tClassic 链路状态变更及查询（如 role、RSSI）
链路管理acl_le_link_interface_tLE 链路参数更新、PHY 变更等
数据与流控on_send_data_upwards, on_packets_completed数据上传 & 发送完成反馈
  • controller 层收到对应 HCI Event 或 Command Complete 后，会查找并调用对应回调函数，从而解耦事件分发。

4. GetAclInterface

如下是我们 协议栈里面的 对于 acl_interface_t 结构变量的赋值。

  • system/main/shim/acl_legacy_interface.cc

const acl_interface_t GetAclInterface() {acl_interface_t acl_interface{.on_send_data_upwards = acl_rcv_acl_data,.on_packets_completed = acl_packets_completed,.connection.classic.on_connected = on_acl_br_edr_connected,.connection.classic.on_failed = on_acl_br_edr_failed,.connection.classic.on_disconnected = btm_acl_disconnected,.connection.le.on_connected =acl_ble_enhanced_connection_complete_from_shim,.connection.le.on_failed = acl_ble_connection_fail,.connection.le.on_disconnected = btm_acl_disconnected,.connection.le.on_iso_disconnected = btm_acl_iso_disconnected,.connection.sco.on_esco_connect_request = btm_sco_on_esco_connect_request,.connection.sco.on_sco_connect_request = btm_sco_on_sco_connect_request,.connection.sco.on_disconnected = btm_sco_on_disconnected,.link.classic.on_authentication_complete = btm_sec_auth_complete,.link.classic.on_central_link_key_complete = nullptr,.link.classic.on_change_connection_link_key_complete = nullptr,.link.classic.on_encryption_change = nullptr,.link.classic.on_flow_specification_complete = nullptr,.link.classic.on_flush_occurred = nullptr,.link.classic.on_mode_change = btm_pm_on_mode_change,.link.classic.on_packet_type_changed = nullptr,.link.classic.on_qos_setup_complete = nullptr,.link.classic.on_read_afh_channel_map_complete = nullptr,.link.classic.on_read_automatic_flush_timeout_complete = nullptr,.link.classic.on_sniff_subrating = btm_pm_on_sniff_subrating,.link.classic.on_read_clock_complete = nullptr,.link.classic.on_read_clock_offset_complete = nullptr,.link.classic.on_read_failed_contact_counter_complete = nullptr,.link.classic.on_read_link_policy_settings_complete = nullptr,.link.classic.on_read_link_quality_complete = nullptr,.link.classic.on_read_link_supervision_timeout_complete = nullptr,.link.classic.on_read_remote_version_information_complete =btm_read_remote_version_complete,.link.classic.on_read_remote_supported_features_complete =acl_process_supported_features,.link.classic.on_read_remote_extended_features_complete =acl_process_extended_features,.link.classic.on_read_rssi_complete = nullptr,.link.classic.on_read_transmit_power_level_complete = nullptr,.link.classic.on_role_change = btm_acl_role_changed,.link.classic.on_role_discovery_complete = nullptr,.link.le.on_connection_update = acl_ble_update_event_received,.link.le.on_data_length_change = acl_ble_data_length_change_event,.link.le.on_read_remote_version_information_complete =btm_read_remote_version_complete,.link.le.on_phy_update = gatt_notify_phy_updated,};return acl_interface;
}

1. 顶层接口函数回调

功能场景回调字段名回调函数名说明
上行传输 ACL 数据on_send_data_upwardsacl_rcv_acl_data将接收到的 ACL 数据包上传到上层（如 L2CAP）
完成数据包发送通知on_packets_completedacl_packets_completed通知上层某个 handle 的 N 个数据包发送完成

2. ACL Classic 连接事件回调（BR/EDR）

功能场景回调字段名回调函数名说明
Classic 连接成功connection.classic.on_connectedon_acl_br_edr_connected连接建立成功，回调 handle 和地址
Classic 连接失败connection.classic.on_failedon_acl_br_edr_failed连接建立失败，回调失败原因
Classic 断开连接connection.classic.on_disconnectedbtm_acl_disconnectedACL 通道断开回调

3. ACL LE（BLE）连接事件回调

功能场景回调字段名回调函数名说明
BLE 连接成功connection.le.on_connectedacl_ble_enhanced_connection_complete_from_shim支持 enhanced connection
BLE 连接失败connection.le.on_failedacl_ble_connection_fail建立失败，如超时/被拒
BLE ACL 断开connection.le.on_disconnectedbtm_acl_disconnected同 classic 共用断链回调
BLE ISO 通道断开connection.le.on_iso_disconnectedbtm_acl_iso_disconnectedCIS/BIS 信道断开时调用

4. SCO/eSCO 音频连接回调

功能场景回调字段名回调函数名说明
对端请求建立 eSCO 音频connection.sco.on_esco_connect_requestbtm_sco_on_esco_connect_request提示是否接受连接
对端请求建立 SCO 音频connection.sco.on_sco_connect_requestbtm_sco_on_sco_connect_request
SCO 音频通道断开connection.sco.on_disconnectedbtm_sco_on_disconnected

5. Classic 链路管理事件回调

功能场景回调字段名回调函数名说明
身份认证完成link.classic.on_authentication_completebtm_sec_auth_complete配对阶段身份认证完成
sniff 子速率事件link.classic.on_sniff_subratingbtm_pm_on_sniff_subratingSniff 模式节能配置回调
低功耗模式变更（sniff/hold/park）link.classic.on_mode_changebtm_pm_on_mode_change模式变更事件，如进入 sniff
远端版本信息读取完成link.classic.on_read_remote_version_information_completebtm_read_remote_version_complete
远端 supported features 读取完成link.classic.on_read_remote_supported_features_completeacl_process_supported_features
远端 extended features 读取完成link.classic.on_read_remote_extended_features_completeacl_process_extended_features
主从角色变更完成link.classic.on_role_changebtm_acl_role_changed主动 role switch 或对方触发的结果

注：其它字段如 on_encryption_change、on_qos_setup_complete、on_read_rssi_complete 等设置为 nullptr，表示当前 shim 或协议栈没有用到。

6. LE 链路管理事件回调

功能场景回调字段名回调函数名说明
BLE 连接参数更新完成link.le.on_connection_updateacl_ble_update_event_received参数如 interval、latency 更新
BLE 数据长度扩展更新（DLE）link.le.on_data_length_changeacl_ble_data_length_change_event控制器支持 DLE 时更新 TX/RX octet
BLE PHY 层更新完成（如 1M -> 2M）link.le.on_phy_updategatt_notify_phy_updated
BLE 远程版本读取完成link.le.on_read_remote_version_information_completebtm_read_remote_version_complete与 Classic 共用版本读取回调

7.小结

类别事件场景回调函数
Classic ACL连接成功on_acl_br_edr_connected
连接失败on_acl_br_edr_failed
断开连接btm_acl_disconnected
BLE ACL连接成功（enhanced）acl_ble_enhanced_connection_complete_from_shim
连接失败acl_ble_connection_fail
ACL/ISO 断开btm_acl_disconnected / btm_acl_iso_disconnected
SCO/eSCO对方请求连接btm_sco_on_esco_connect_request / btm_sco_on_sco_connect_request
通道断开btm_sco_on_disconnected
链路管理配对认证完成btm_sec_auth_complete
模式变更 / sniffbtm_pm_on_mode_change / btm_pm_on_sniff_subrating
远程版本 & 特性读取btm_read_remote_version_complete 等
BLE 链路更新/PHY更新acl_ble_update_event_received, gatt_notify_phy_updated

5. 用处

我之所以单独将 acl_interface_t 整理出来：

  • 它在 AOSP 蓝牙协议栈中起到了事件中转中心的作用，深入理解它对快速排查问题和梳理控制流非常有帮助。
序号价值说明
1快速定位 HCI 事件与上层响应逻辑每个 HCI 事件（如连接成功/断开/参数更新）都会最终回调到这个结构体中某个函数指针，可据此快速查找处理函数。
2统一视角区分 BLE / Classic / SCO 逻辑Classic、LE、SCO 各自的连接/链路处理逻辑都被封装在不同子结构体，阅读时可以按模块区分，避免混淆。
3方便调试断点与日志定位在调试工具（如 GDB 或 logcat）中设置断点/观察变量时，可以只看 acl_interface_t 的调用路径，即可捕获事件走向。
4反查控制器事件源头与分发路径从 HCI 层（如 hci_layer.cc）或 legacy shim 层（如 acl.cc）中，控制器接收的事件如何一步步调用到这些回调函数，可以一条线串起来排查问题来源。

1. 使用场景：快速排查问题指南

场景 1：Classic 蓝牙连接失败

  • 你看到： 日志中出现连接失败错误，比如 status=0x04。

  • 排查路径：

→ HCI Connection Complete Event
→ shim layer 中 acl.cc 处理该事件
→ 调用 acl_interface.connection.classic.on_failed
→ 实际函数是：on_acl_br_edr_failed()
→ 查看这个函数内部是否有日志/状态错误处理

场景 2：BLE 连接建立失败或异常断链

  • 你看到： acl_ble_connection_fail() 被调用。

  • 排查路径：

→ HCI LE Connection Complete Fail
→ 查找调用了 GetAclInterface().connection.le.on_failed 的地方
→ 实际是 shim/acl.cc 或 legacy_event_handler.cc 中触发
→ 根据 handle/peer 地址继续反查 L2CAP/GATT 层异常处理

场景 3：ACL 通道断开，无法上层感知

  • 你看到： btm_acl_disconnected() 被调用但应用未感知断开。

  • 排查路径：

→ acl_interface.connection.classic/le.on_disconnected
→ btm_acl_disconnected
→ 通常继续调用 BTM 层状态管理
→ 最终触发 callbacks 到 framework 层（如 adapter 状态变化）

场景 4：LE 参数更新失败或没生效

  • 你看到： acl_ble_update_event_received() 日志异常。

  • 排查路径：

→ HCI LE Connection Update Complete
→ 调用 acl_interface.link.le.on_connection_update
→ 函数内部检查 status / 更新 interval / latency 等
→ 如果没触发 GATT 层响应，说明下游未联动，可回溯处理路径

2.阅读代码时的实用技巧

技巧示例
使用结构体名搜索函数使用grep -r on_acl_br_edr_failed external/
使用 GetAclInterface() 作为断点入口可在调试工具里打断点： b GetAclInterface 或设置观察点
追踪调用链从 shim 层的 acl.cc 开始，查找事件如何分发给 acl_interface
加日志定位回调触发点在比如 acl_ble_enhanced_connection_complete_from_shim() 中加 log 看是否被调到

3.总结

总结项内容
设计目的acl_interface_t 是 shim 层对上暴露的统一回调注册接口
涵盖内容连接相关（classic, le, sco）+ 链路管理（role、版本、phy、dle）+ 数据流控
阅读价值快速从 HCI 层回溯事件到处理函数 / 快速跳转到逻辑异常的根源
故障排查尤其适合处理连接建立失败、BLE 参数异常、断链无感、SCO 音频断开等问题
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