1 /****************************************************************************** 2 * 3 * Copyright 2014 Google, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 #pragma once 20 21 #include <hardware/bluetooth.h> 22 #include <stdbool.h> 23 #include <stdint.h> 24 25 typedef struct buffer_t buffer_t; 26 typedef struct l2cap_client_t l2cap_client_t; 27 28 typedef struct { 29 void (*connected)(l2cap_client_t* client, void* context); 30 void (*disconnected)(l2cap_client_t* client, void* context); 31 void (*read_ready)(l2cap_client_t* client, buffer_t* packet, void* context); 32 void (*write_ready)(l2cap_client_t* client, void* context); 33 } l2cap_client_callbacks_t; 34 35 // Returns a new buffer with enough space for |size| bytes of L2CAP payload. 36 // |size| must be greater than zero. This function returns NULL if the buffer 37 // could not be allocated. The returned buffer must be freed with |buffer_free| 38 // when it is no longer needed. 39 buffer_t* l2cap_buffer_new(size_t size); 40 41 // Creates and returns a new L2CAP client object. |callbacks| must not be NULL 42 // and must specify a set of functions that should be called back when events 43 // occur on the L2CAP connection. |context| may be NULL and will be passed as 44 // the argument to all callbacks in |l2cap_client_callbacks_t|. The returned 45 // object must be freed with |l2cap_client_free|. 46 l2cap_client_t* l2cap_client_new(const l2cap_client_callbacks_t* callbacks, 47 void* context); 48 49 // Frees the L2CAP client object allocated with |l2cap_client_new|. |client| may 50 // be NULL. 51 void l2cap_client_free(l2cap_client_t* client); 52 53 // Attempts to connect the |client| to a peer device specified by 54 // |remote_bdaddr| using the |psm| protocol specifier. This function returns 55 // true if the connect operation could be started and will indicate completion 56 // with either a 'connected' callback (success) or a 'disconnected' callback 57 // (failure). 58 // 59 // This function must not be called while a connect operation is in progress or 60 // while |l2cap_client_is_connected|. |client| and |remote_bdaddr| must not be 61 // NULL. |psm| must be greater than zero. 62 bool l2cap_client_connect(l2cap_client_t* client, 63 const RawAddress& remote_bdaddr, uint16_t psm); 64 65 // Disconnects a connected |client|. This function is asynchronous and 66 // idempotent. It will indicate completion with a 'disconnected' callback. 67 // |client| must not be NULL. 68 void l2cap_client_disconnect(l2cap_client_t* client); 69 70 // Returns true if |client| is connected and is ready to accept data written 71 // to it. |client| must not be NULL. 72 bool l2cap_client_is_connected(const l2cap_client_t* client); 73 74 // Writes data contained in |packet| to a connected |client|. This function 75 // returns true if the packet was successfully queued for delivery, false if the 76 // client cannot accept more data at this time. If this function returns false, 77 // the caller must wait for the 'write_ready' callback to write additional data 78 // to the client. Neither |client| nor |packet| may be NULL. 79 bool l2cap_client_write(l2cap_client_t* client, buffer_t* packet); 80