1 /****************************************************************************** 2 * 3 * Copyright (C) 2009-2012 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 * Filename: btif_profile_queue.c 22 * 23 * Description: Bluetooth remote device connection queuing implementation. 24 * 25 ******************************************************************************/ 26 27 #define LOG_TAG "bt_btif_queue" 28 29 #include "btif_profile_queue.h" 30 31 #include <assert.h> 32 #include <string.h> 33 34 #include "btif_common.h" 35 #include "bt_common.h" 36 #include "osi/include/allocator.h" 37 #include "osi/include/list.h" 38 #include "stack_manager.h" 39 40 /******************************************************************************* 41 ** Local type definitions 42 *******************************************************************************/ 43 44 typedef enum { 45 BTIF_QUEUE_CONNECT_EVT, 46 BTIF_QUEUE_ADVANCE_EVT, 47 } btif_queue_event_t; 48 49 typedef struct { 50 bt_bdaddr_t bda; 51 uint16_t uuid; 52 bool busy; 53 btif_connect_cb_t connect_cb; 54 } connect_node_t; 55 56 /******************************************************************************* 57 ** Static variables 58 *******************************************************************************/ 59 60 static list_t *connect_queue; 61 62 static const size_t MAX_REASONABLE_REQUESTS = 10; 63 64 /******************************************************************************* 65 ** Queue helper functions 66 *******************************************************************************/ 67 68 static void queue_int_add(connect_node_t *p_param) { 69 if (!connect_queue) { 70 connect_queue = list_new(osi_free); 71 assert(connect_queue != NULL); 72 } 73 74 // Sanity check to make sure we're not leaking connection requests 75 assert(list_length(connect_queue) < MAX_REASONABLE_REQUESTS); 76 77 for (const list_node_t *node = list_begin(connect_queue); node != list_end(connect_queue); node = list_next(node)) { 78 if (((connect_node_t *)list_node(node))->uuid == p_param->uuid) { 79 LOG_INFO(LOG_TAG, "%s dropping duplicate connect request for uuid: %04x", __func__, p_param->uuid); 80 return; 81 } 82 } 83 84 connect_node_t *p_node = osi_malloc(sizeof(connect_node_t)); 85 memcpy(p_node, p_param, sizeof(connect_node_t)); 86 list_append(connect_queue, p_node); 87 } 88 89 static void queue_int_advance() { 90 if (connect_queue && !list_is_empty(connect_queue)) 91 list_remove(connect_queue, list_front(connect_queue)); 92 } 93 94 static void queue_int_handle_evt(UINT16 event, char *p_param) { 95 switch(event) { 96 case BTIF_QUEUE_CONNECT_EVT: 97 queue_int_add((connect_node_t *)p_param); 98 break; 99 100 case BTIF_QUEUE_ADVANCE_EVT: 101 queue_int_advance(); 102 break; 103 } 104 105 if (stack_manager_get_interface()->get_stack_is_running()) 106 btif_queue_connect_next(); 107 } 108 109 /******************************************************************************* 110 ** 111 ** Function btif_queue_connect 112 ** 113 ** Description Add a new connection to the queue and trigger the next 114 ** scheduled connection. 115 ** 116 ** Returns BT_STATUS_SUCCESS if successful 117 ** 118 *******************************************************************************/ 119 bt_status_t btif_queue_connect(uint16_t uuid, const bt_bdaddr_t *bda, btif_connect_cb_t connect_cb) { 120 connect_node_t node; 121 memset(&node, 0, sizeof(connect_node_t)); 122 memcpy(&node.bda, bda, sizeof(bt_bdaddr_t)); 123 node.uuid = uuid; 124 node.connect_cb = connect_cb; 125 126 return btif_transfer_context(queue_int_handle_evt, BTIF_QUEUE_CONNECT_EVT, 127 (char *)&node, sizeof(connect_node_t), NULL); 128 } 129 130 /******************************************************************************* 131 ** 132 ** Function btif_queue_advance 133 ** 134 ** Description Clear the queue's busy status and advance to the next 135 ** scheduled connection. 136 ** 137 ** Returns void 138 ** 139 *******************************************************************************/ 140 void btif_queue_advance() { 141 btif_transfer_context(queue_int_handle_evt, BTIF_QUEUE_ADVANCE_EVT, 142 NULL, 0, NULL); 143 } 144 145 // This function dispatches the next pending connect request. It is called from 146 // stack_manager when the stack comes up. 147 bt_status_t btif_queue_connect_next(void) { 148 if (!connect_queue || list_is_empty(connect_queue)) 149 return BT_STATUS_FAIL; 150 151 connect_node_t *p_head = list_front(connect_queue); 152 153 // If the queue is currently busy, we return success anyway, 154 // since the connection has been queued... 155 if (p_head->busy) 156 return BT_STATUS_SUCCESS; 157 158 p_head->busy = true; 159 return p_head->connect_cb(&p_head->bda, p_head->uuid); 160 } 161 162 /******************************************************************************* 163 ** 164 ** Function btif_queue_release 165 ** 166 ** Description Free up all the queue nodes and set the queue head to NULL 167 ** 168 ** Returns void 169 ** 170 *******************************************************************************/ 171 void btif_queue_release() { 172 list_free(connect_queue); 173 connect_queue = NULL; 174 } 175
