1 /****************************************************************************** 2 * 3 * Copyright (C) 2003-2012 Broadcom Corporation 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 /****************************************************************************** 20 * 21 * This interface file contains the interface to the Audio Video Control 22 * Transport Protocol (AVCTP). 23 * 24 ******************************************************************************/ 25 #ifndef AVCT_API_H 26 #define AVCT_API_H 27 28 #include "bt_target.h" 29 #include "bt_types.h" 30 31 /***************************************************************************** 32 * Constants 33 ****************************************************************************/ 34 35 /* API function return value result codes. */ 36 #define AVCT_SUCCESS 0 /* Function successful */ 37 #define AVCT_NO_RESOURCES 1 /* Not enough resources */ 38 #define AVCT_BAD_HANDLE 2 /* Bad handle */ 39 #define AVCT_PID_IN_USE 3 /* PID already in use */ 40 #define AVCT_NOT_OPEN 4 /* Connection not open */ 41 42 /* PSM for AVCT. */ 43 #define AVCT_PSM 0x0017 44 #define AVCT_BR_PSM 0x001B 45 46 /* Protocol revision numbers */ 47 #define AVCT_REV_1_0 0x0100 48 #define AVCT_REV_1_2 0x0102 49 #define AVCT_REV_1_3 0x0103 50 #define AVCT_REV_1_4 0x0104 51 52 /* the layer_specific settings */ 53 #define AVCT_DATA_CTRL 0x0001 /* for the control channel */ 54 #define AVCT_DATA_BROWSE 0x0002 /* for the browsing channel */ 55 #define AVCT_DATA_PARTIAL 0x0100 /* Only have room for a partial message */ 56 57 /* Per the AVRC spec, minimum MTU for the control channel */ 58 #define AVCT_MIN_CONTROL_MTU 48 59 /* Per the AVRC spec, minimum MTU for the browsing channel */ 60 #define AVCT_MIN_BROWSE_MTU 335 61 62 /* Message offset. The number of bytes needed by the protocol stack for the 63 * protocol headers of an AVCTP message packet. 64 */ 65 #define AVCT_MSG_OFFSET 15 66 #define AVCT_BROWSE_OFFSET 17 /* the default offset for browsing channel */ 67 68 /* Connection role. */ 69 #define AVCT_INT 0 /* Initiator connection */ 70 #define AVCT_ACP 1 /* Acceptor connection */ 71 72 /* Control role. */ 73 #define AVCT_TARGET 1 /* target */ 74 #define AVCT_CONTROL 2 /* controller */ 75 #define AVCT_PASSIVE 4 /* If conflict, allow the other side to succeed */ 76 77 /* Command/Response indicator. */ 78 #define AVCT_CMD 0 /* Command message */ 79 #define AVCT_RSP 2 /* Response message */ 80 #define AVCT_REJ 3 /* Message rejected */ 81 82 /* Control callback events. */ 83 #define AVCT_CONNECT_CFM_EVT 0 /* Connection confirm */ 84 #define AVCT_CONNECT_IND_EVT 1 /* Connection indication */ 85 #define AVCT_DISCONNECT_CFM_EVT 2 /* Disconnect confirm */ 86 #define AVCT_DISCONNECT_IND_EVT 3 /* Disconnect indication */ 87 #define AVCT_CONG_IND_EVT 4 /* Congestion indication */ 88 #define AVCT_UNCONG_IND_EVT 5 /* Uncongestion indication */ 89 #define AVCT_BROWSE_CONN_CFM_EVT 6 /* Browse Connection confirm */ 90 #define AVCT_BROWSE_CONN_IND_EVT 7 /* Browse Connection indication */ 91 #define AVCT_BROWSE_DISCONN_CFM_EVT 8 /* Browse Disconnect confirm */ 92 #define AVCT_BROWSE_DISCONN_IND_EVT 9 /* Browse Disconnect indication */ 93 #define AVCT_BROWSE_CONG_IND_EVT 10 /* Congestion indication */ 94 #define AVCT_BROWSE_UNCONG_IND_EVT 11 /* Uncongestion indication */ 95 96 /* General purpose failure result code for callback events. */ 97 #define AVCT_RESULT_FAIL 5 98 99 /***************************************************************************** 100 * Type Definitions 101 ****************************************************************************/ 102 103 /* Control callback function. */ 104 typedef void(tAVCT_CTRL_CBACK)(uint8_t handle, uint8_t event, uint16_t result, 105 BD_ADDR peer_addr); 106 107 /* Message callback function */ 108 /* p_pkt->layer_specific is AVCT_DATA_CTRL or AVCT_DATA_BROWSE */ 109 typedef void(tAVCT_MSG_CBACK)(uint8_t handle, uint8_t label, uint8_t cr, 110 BT_HDR* p_pkt); 111 112 /* Structure used by AVCT_CreateConn. */ 113 typedef struct { 114 tAVCT_CTRL_CBACK* p_ctrl_cback; /* Control callback */ 115 tAVCT_MSG_CBACK* p_msg_cback; /* Message callback */ 116 uint16_t pid; /* Profile ID */ 117 uint8_t role; /* Initiator/acceptor role */ 118 uint8_t control; /* Control role (Control/Target) */ 119 } tAVCT_CC; 120 121 /***************************************************************************** 122 * External Function Declarations 123 ****************************************************************************/ 124 125 /******************************************************************************* 126 * 127 * Function AVCT_Register 128 * 129 * Description This is the system level registration function for the 130 * AVCTP protocol. This function initializes AVCTP and 131 * prepares the protocol stack for its use. This function 132 * must be called once by the system or platform using AVCTP 133 * before the other functions of the API an be used. 134 * 135 * 136 * Returns void 137 * 138 ******************************************************************************/ 139 extern void AVCT_Register(uint16_t mtu, uint16_t mtu_br, uint8_t sec_mask); 140 141 /******************************************************************************* 142 * 143 * Function AVCT_Deregister 144 * 145 * Description This function is called to deregister use AVCTP protocol. 146 * It is called when AVCTP is no longer being used by any 147 * application in the system. Before this function can be 148 * called, all connections must be removed with 149 * AVCT_RemoveConn(). 150 * 151 * 152 * Returns void 153 * 154 ******************************************************************************/ 155 extern void AVCT_Deregister(void); 156 157 /******************************************************************************* 158 * 159 * Function AVCT_CreateConn 160 * 161 * Description Create an AVCTP connection. There are two types of 162 * connections, initiator and acceptor, as determined by 163 * the p_cc->role parameter. When this function is called to 164 * create an initiator connection, an AVCTP connection to 165 * the peer device is initiated if one does not already exist. 166 * If an acceptor connection is created, the connection waits 167 * passively for an incoming AVCTP connection from a peer 168 * device. 169 * 170 * 171 * Returns AVCT_SUCCESS if successful, otherwise error. 172 * 173 ******************************************************************************/ 174 extern uint16_t AVCT_CreateConn(uint8_t* p_handle, tAVCT_CC* p_cc, 175 BD_ADDR peer_addr); 176 177 /******************************************************************************* 178 * 179 * Function AVCT_RemoveConn 180 * 181 * Description Remove an AVCTP connection. This function is called when 182 * the application is no longer using a connection. If this 183 * is the last connection to a peer the L2CAP channel for AVCTP 184 * will be closed. 185 * 186 * 187 * Returns AVCT_SUCCESS if successful, otherwise error. 188 * 189 ******************************************************************************/ 190 extern uint16_t AVCT_RemoveConn(uint8_t handle); 191 192 /******************************************************************************* 193 * 194 * Function AVCT_CreateBrowse 195 * 196 * Description Create an AVCTP connection. There are two types of 197 * connections, initiator and acceptor, as determined by 198 * the p_cc->role parameter. When this function is called to 199 * create an initiator connection, an AVCTP connection to 200 * the peer device is initiated if one does not already exist. 201 * If an acceptor connection is created, the connection waits 202 * passively for an incoming AVCTP connection from a peer 203 * device. 204 * 205 * 206 * Returns AVCT_SUCCESS if successful, otherwise error. 207 * 208 ******************************************************************************/ 209 extern uint16_t AVCT_CreateBrowse(uint8_t handle, uint8_t role); 210 211 /******************************************************************************* 212 * 213 * Function AVCT_RemoveBrowse 214 * 215 * Description Remove an AVCTP connection. This function is called when 216 * the application is no longer using a connection. If this 217 * is the last connection to a peer the L2CAP channel for AVCTP 218 * will be closed. 219 * 220 * 221 * Returns AVCT_SUCCESS if successful, otherwise error. 222 * 223 ******************************************************************************/ 224 extern uint16_t AVCT_RemoveBrowse(uint8_t handle); 225 226 /******************************************************************************* 227 * 228 * Function AVCT_GetBrowseMtu 229 * 230 * Description Get the peer_mtu for the AVCTP Browse channel of the given 231 * connection. 232 * 233 * Returns the peer browsing channel MTU. 234 * 235 ******************************************************************************/ 236 extern uint16_t AVCT_GetBrowseMtu(uint8_t handle); 237 238 /******************************************************************************* 239 * 240 * Function AVCT_GetPeerMtu 241 * 242 * Description Get the peer_mtu for the AVCTP channel of the given 243 * connection. 244 * 245 * Returns the peer MTU size. 246 * 247 ******************************************************************************/ 248 extern uint16_t AVCT_GetPeerMtu(uint8_t handle); 249 250 /******************************************************************************* 251 * 252 * Function AVCT_MsgReq 253 * 254 * Description Send an AVCTP message to a peer device. In calling 255 * AVCT_MsgReq(), the application should keep track of the 256 * congestion state of AVCTP as communicated with events 257 * AVCT_CONG_IND_EVT and AVCT_UNCONG_IND_EVT. If the 258 * application calls AVCT_MsgReq() when AVCTP is congested 259 * the message may be discarded. The application may make its 260 * first call to AVCT_MsgReq() after it receives an 261 * AVCT_CONNECT_CFM_EVT or AVCT_CONNECT_IND_EVT on control 262 * channel or 263 * AVCT_BROWSE_CONN_CFM_EVT or AVCT_BROWSE_CONN_IND_EVT on 264 * browsing channel. 265 * 266 * p_msg->layer_specific must be set to 267 * AVCT_DATA_CTRL for control channel traffic; 268 * AVCT_DATA_BROWSE for for browse channel traffic. 269 * 270 * Returns AVCT_SUCCESS if successful, otherwise error. 271 * 272 ******************************************************************************/ 273 extern uint16_t AVCT_MsgReq(uint8_t handle, uint8_t label, uint8_t cr, 274 BT_HDR* p_msg); 275 276 #endif /* AVCT_API_H */ 277