/* * Copyright (C) 2016 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define __BTSTACK_FILE__ "avrcp_browsing_target.c" #include #include #include #include #include #include "btstack.h" #include "classic/avrcp.h" #include "classic/avrcp_browsing_target.h" #define PSM_AVCTP_BROWSING 0x001b static void avrcp_browser_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size, avrcp_context_t * context); static void avrcp_browsing_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static avrcp_connection_t * get_avrcp_connection_for_browsing_cid(uint16_t browsing_cid, avrcp_context_t * context){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &context->connections); while (btstack_linked_list_iterator_has_next(&it)){ avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it); if (connection->avrcp_browsing_cid != browsing_cid) continue; return connection; } return NULL; } static avrcp_connection_t * get_avrcp_connection_for_browsing_l2cap_cid(uint16_t browsing_l2cap_cid, avrcp_context_t * context){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &context->connections); while (btstack_linked_list_iterator_has_next(&it)){ avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it); if (connection->browsing_connection && connection->browsing_connection->l2cap_browsing_cid != browsing_l2cap_cid) continue; return connection; } return NULL; } static avrcp_browsing_connection_t * get_avrcp_browsing_connection_for_l2cap_cid(uint16_t l2cap_cid, avrcp_context_t * context){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &context->connections); while (btstack_linked_list_iterator_has_next(&it)){ avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it); if (connection->browsing_connection && connection->browsing_connection->l2cap_browsing_cid != l2cap_cid) continue; return connection->browsing_connection; } return NULL; } static void avrcp_emit_browsing_connection_established(btstack_packet_handler_t callback, uint16_t browsing_cid, bd_addr_t addr, uint8_t status){ if (!callback) return; uint8_t event[12]; int pos = 0; event[pos++] = HCI_EVENT_AVRCP_META; event[pos++] = sizeof(event) - 2; event[pos++] = AVRCP_SUBEVENT_BROWSING_CONNECTION_ESTABLISHED; event[pos++] = status; reverse_bd_addr(addr,&event[pos]); pos += 6; little_endian_store_16(event, pos, browsing_cid); pos += 2; (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); } static void avrcp_emit_incoming_browsing_connection(btstack_packet_handler_t callback, uint16_t browsing_cid, bd_addr_t addr){ if (!callback) return; uint8_t event[11]; int pos = 0; event[pos++] = HCI_EVENT_AVRCP_META; event[pos++] = sizeof(event) - 2; event[pos++] = AVRCP_SUBEVENT_INCOMING_BROWSING_CONNECTION; reverse_bd_addr(addr,&event[pos]); pos += 6; little_endian_store_16(event, pos, browsing_cid); pos += 2; (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); } static void avrcp_emit_browsing_connection_closed(btstack_packet_handler_t callback, uint16_t browsing_cid){ if (!callback) return; uint8_t event[5]; int pos = 0; event[pos++] = HCI_EVENT_AVRCP_META; event[pos++] = sizeof(event) - 2; event[pos++] = AVRCP_SUBEVENT_BROWSING_CONNECTION_RELEASED; little_endian_store_16(event, pos, browsing_cid); pos += 2; (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); } static avrcp_browsing_connection_t * avrcp_browsing_create_connection(avrcp_connection_t * avrcp_connection){ avrcp_browsing_connection_t * connection = btstack_memory_avrcp_browsing_connection_get(); memset(connection, 0, sizeof(avrcp_browsing_connection_t)); connection->state = AVCTP_CONNECTION_IDLE; connection->transaction_label = 0xFF; avrcp_connection->avrcp_browsing_cid = avrcp_get_next_cid(); avrcp_connection->browsing_connection = connection; return connection; } static uint8_t avrcp_browsing_connect(bd_addr_t remote_addr, avrcp_context_t * context, uint8_t * ertm_buffer, uint32_t size, l2cap_ertm_config_t * ertm_config, uint16_t * browsing_cid){ avrcp_connection_t * avrcp_connection = get_avrcp_connection_for_bd_addr(remote_addr, context); if (!avrcp_connection){ log_error("avrcp: there is no previously established AVRCP controller connection."); return ERROR_CODE_COMMAND_DISALLOWED; } avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; if (connection){ log_error(" avrcp_browsing_connect connection exists."); return ERROR_CODE_SUCCESS; } connection = avrcp_browsing_create_connection(avrcp_connection); if (!connection){ log_error("avrcp: could not allocate connection struct."); return BTSTACK_MEMORY_ALLOC_FAILED; } if (!browsing_cid) return L2CAP_LOCAL_CID_DOES_NOT_EXIST; *browsing_cid = avrcp_connection->avrcp_browsing_cid; connection->ertm_buffer = ertm_buffer; connection->ertm_buffer_size = size; avrcp_connection->browsing_connection = connection; memcpy(&connection->ertm_config, ertm_config, sizeof(l2cap_ertm_config_t)); return l2cap_create_ertm_channel(avrcp_browsing_target_packet_handler, remote_addr, avrcp_connection->browsing_l2cap_psm, &connection->ertm_config, connection->ertm_buffer, connection->ertm_buffer_size, NULL); } static void avrcp_browser_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size, avrcp_context_t * context){ UNUSED(channel); UNUSED(size); bd_addr_t event_addr; uint16_t local_cid; uint8_t status; avrcp_browsing_connection_t * browsing_connection = NULL; avrcp_connection_t * avrcp_connection = NULL; if (packet_type != HCI_EVENT_PACKET) return; switch (hci_event_packet_get_type(packet)) { case HCI_EVENT_DISCONNECTION_COMPLETE: avrcp_emit_browsing_connection_closed(context->browsing_avrcp_callback, 0); break; case L2CAP_EVENT_INCOMING_CONNECTION: l2cap_event_incoming_connection_get_address(packet, event_addr); local_cid = l2cap_event_incoming_connection_get_local_cid(packet); avrcp_connection = get_avrcp_connection_for_bd_addr(event_addr, context); if (!avrcp_connection) { log_error("No previously created AVRCP controller connections"); l2cap_decline_connection(local_cid); break; } browsing_connection = avrcp_browsing_create_connection(avrcp_connection); browsing_connection->l2cap_browsing_cid = local_cid; browsing_connection->state = AVCTP_CONNECTION_W4_ERTM_CONFIGURATION; log_info("Emit AVRCP_SUBEVENT_INCOMING_BROWSING_CONNECTION browsing_cid 0x%02x, l2cap_signaling_cid 0x%02x\n", avrcp_connection->avrcp_browsing_cid, browsing_connection->l2cap_browsing_cid); avrcp_emit_incoming_browsing_connection(context->browsing_avrcp_callback, avrcp_connection->avrcp_browsing_cid, event_addr); break; case L2CAP_EVENT_CHANNEL_OPENED: l2cap_event_channel_opened_get_address(packet, event_addr); status = l2cap_event_channel_opened_get_status(packet); local_cid = l2cap_event_channel_opened_get_local_cid(packet); avrcp_connection = get_avrcp_connection_for_bd_addr(event_addr, context); if (!avrcp_connection){ log_error("Failed to find AVRCP connection for bd_addr %s", bd_addr_to_str(event_addr)); avrcp_emit_browsing_connection_established(context->browsing_avrcp_callback, local_cid, event_addr, L2CAP_LOCAL_CID_DOES_NOT_EXIST); l2cap_disconnect(local_cid, 0); // reason isn't used break; } browsing_connection = avrcp_connection->browsing_connection; if (status != ERROR_CODE_SUCCESS){ log_info("L2CAP connection to connection %s failed. status code 0x%02x", bd_addr_to_str(event_addr), status); avrcp_emit_browsing_connection_established(context->browsing_avrcp_callback, avrcp_connection->avrcp_browsing_cid, event_addr, status); btstack_memory_avrcp_browsing_connection_free(browsing_connection); avrcp_connection->browsing_connection = NULL; break; } if (browsing_connection->state != AVCTP_CONNECTION_W4_L2CAP_CONNECTED) break; browsing_connection->l2cap_browsing_cid = local_cid; log_info("L2CAP_EVENT_CHANNEL_OPENED browsing cid 0x%02x, l2cap cid 0x%02x", avrcp_connection->avrcp_browsing_cid, browsing_connection->l2cap_browsing_cid); browsing_connection->state = AVCTP_CONNECTION_OPENED; avrcp_emit_browsing_connection_established(context->browsing_avrcp_callback, avrcp_connection->avrcp_browsing_cid, event_addr, ERROR_CODE_SUCCESS); break; case L2CAP_EVENT_CHANNEL_CLOSED: // data: event (8), len(8), channel (16) local_cid = l2cap_event_channel_closed_get_local_cid(packet); avrcp_connection = get_avrcp_connection_for_browsing_l2cap_cid(local_cid, context); if (avrcp_connection && avrcp_connection->browsing_connection){ avrcp_emit_browsing_connection_closed(context->browsing_avrcp_callback, avrcp_connection->avrcp_browsing_cid); // free connection btstack_memory_avrcp_browsing_connection_free(avrcp_connection->browsing_connection); avrcp_connection->browsing_connection = NULL; break; } break; default: break; } } static void avrcp_browsing_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ avrcp_browsing_connection_t * browsing_connection; switch (packet_type) { case L2CAP_DATA_PACKET:{ browsing_connection = get_avrcp_browsing_connection_for_l2cap_cid(channel, &avrcp_target_context); if (!browsing_connection) break; break; } case HCI_EVENT_PACKET: switch (hci_event_packet_get_type(packet)){ case L2CAP_EVENT_CAN_SEND_NOW: browsing_connection = get_avrcp_browsing_connection_for_l2cap_cid(channel, &avrcp_target_context); if (!browsing_connection) break; // avrcp_browsing_target_handle_can_send_now(browsing_connection); break; default: avrcp_browser_packet_handler(packet_type, channel, packet, size, &avrcp_target_context); break; } break; default: break; } } void avrcp_browsing_target_init(void){ avrcp_target_context.browsing_packet_handler = avrcp_browsing_target_packet_handler; l2cap_register_service(&avrcp_browsing_target_packet_handler, PSM_AVCTP_BROWSING, 0xffff, LEVEL_0); } void avrcp_browsing_target_register_packet_handler(btstack_packet_handler_t callback){ if (callback == NULL){ log_error("avrcp_browsing_target_register_packet_handler called with NULL callback"); return; } avrcp_target_context.browsing_avrcp_callback = callback; } uint8_t avrcp_browsing_target_connect(bd_addr_t bd_addr, uint8_t * ertm_buffer, uint32_t size, l2cap_ertm_config_t * ertm_config, uint16_t * avrcp_browsing_cid){ return avrcp_browsing_connect(bd_addr, &avrcp_target_context, ertm_buffer, size, ertm_config, avrcp_browsing_cid); } uint8_t avrcp_browsing_target_disconnect(uint16_t avrcp_browsing_cid){ avrcp_connection_t * avrcp_connection = get_avrcp_connection_for_browsing_cid(avrcp_browsing_cid, &avrcp_target_context); if (!avrcp_connection){ log_error("avrcp_browsing_target_disconnect: could not find a connection."); return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; } if (avrcp_connection->browsing_connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; l2cap_disconnect(avrcp_connection->browsing_connection->l2cap_browsing_cid, 0); return ERROR_CODE_SUCCESS; } uint8_t avrcp_browsing_target_configure_incoming_connection(uint16_t avrcp_browsing_cid, uint8_t * ertm_buffer, uint32_t size, l2cap_ertm_config_t * ertm_config){ avrcp_connection_t * avrcp_connection = get_avrcp_connection_for_browsing_cid(avrcp_browsing_cid, &avrcp_target_context); if (!avrcp_connection){ log_error("avrcp_browsing_decline_incoming_connection: could not find a connection."); return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; } if (!avrcp_connection->browsing_connection){ log_error("avrcp_browsing_decline_incoming_connection: no browsing connection."); return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; } if (avrcp_connection->browsing_connection->state != AVCTP_CONNECTION_W4_ERTM_CONFIGURATION){ log_error("avrcp_browsing_decline_incoming_connection: browsing connection in a wrong state."); return ERROR_CODE_COMMAND_DISALLOWED; } avrcp_connection->browsing_connection->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED; avrcp_connection->browsing_connection->ertm_buffer = ertm_buffer; avrcp_connection->browsing_connection->ertm_buffer_size = size; memcpy(&avrcp_connection->browsing_connection->ertm_config, ertm_config, sizeof(l2cap_ertm_config_t)); l2cap_accept_ertm_connection(avrcp_connection->browsing_connection->l2cap_browsing_cid, &avrcp_connection->browsing_connection->ertm_config, avrcp_connection->browsing_connection->ertm_buffer, avrcp_connection->browsing_connection->ertm_buffer_size); return ERROR_CODE_SUCCESS; } uint8_t avrcp_browsing_target_decline_incoming_connection(uint16_t avrcp_browsing_cid){ avrcp_connection_t * avrcp_connection = get_avrcp_connection_for_browsing_cid(avrcp_browsing_cid, &avrcp_target_context); if (!avrcp_connection){ log_error("avrcp_browsing_decline_incoming_connection: could not find a connection."); return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; } if (!avrcp_connection->browsing_connection) return ERROR_CODE_SUCCESS; if (avrcp_connection->browsing_connection->state > AVCTP_CONNECTION_W4_ERTM_CONFIGURATION) return ERROR_CODE_COMMAND_DISALLOWED; l2cap_decline_connection(avrcp_connection->browsing_connection->l2cap_browsing_cid); // free connection btstack_memory_avrcp_browsing_connection_free(avrcp_connection->browsing_connection); avrcp_connection->browsing_connection = NULL; return ERROR_CODE_SUCCESS; }