1 /****************************************************************************** 2 * 3 * Copyright (C) 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 and 42 // must specify a set of functions that should be called back when events occur 43 // on the L2CAP connection. |context| may be NULL and will be passed as the argument 44 // to all callbacks in |l2cap_client_callbacks_t|. The returned object must be freed 45 // with |l2cap_client_free|. 46 l2cap_client_t *l2cap_client_new(const l2cap_client_callbacks_t *callbacks, void *context); 47 48 // Frees the L2CAP client object allocated with |l2cap_client_new|. |client| may be NULL. 49 void l2cap_client_free(l2cap_client_t *client); 50 51 // Attempts to connect the |client| to a peer device specified by |remote_bdaddr| 52 // using the |psm| protocol specifier. This function returns true if the connect 53 // operation could be started and will indicate completion with either a 'connected' 54 // callback (success) or a 'disconnected' callback (failure). 55 // 56 // This function must not be called while a connect operation is in progress or 57 // while |l2cap_client_is_connected|. |client| and |remote_bdaddr| must not be NULL. 58 // |psm| must be greater than zero. 59 bool l2cap_client_connect(l2cap_client_t *client, const bt_bdaddr_t *remote_bdaddr, uint16_t psm); 60 61 // Disconnects a connected |client|. This function is asynchronous and idempotent. It 62 // will indicate completion with a 'disconnected' callback. |client| must not be NULL. 63 void l2cap_client_disconnect(l2cap_client_t *client); 64 65 // Returns true if |client| is connected and is ready to accept data written to it. 66 // |client| must not be NULL. 67 bool l2cap_client_is_connected(const l2cap_client_t *client); 68 69 // Writes data contained in |packet| to a connected |client|. This function returns 70 // true if the packet was successfully queued for delivery, false if the client cannot 71 // accept more data at this time. If this function returns false, the caller must wait 72 // for the 'write_ready' callback to write additional data to the client. Neither 73 // |client| nor |packet| may be NULL. 74 bool l2cap_client_write(l2cap_client_t *client, buffer_t *packet); 75
