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Diffstat (limited to 'btif/src/btif_sm.c')
| -rw-r--r-- | btif/src/btif_sm.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/btif/src/btif_sm.c b/btif/src/btif_sm.c new file mode 100644 index 0000000..cb4e5ad --- /dev/null +++ b/btif/src/btif_sm.c @@ -0,0 +1,205 @@ +/****************************************************************************** + * + * Copyright (C) 2009-2012 Broadcom Corporation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + ******************************************************************************/ + + +/***************************************************************************** + * + * Filename: btif_sm.c + * + * Description: Generic BTIF state machine API + * + *****************************************************************************/ +#include <hardware/bluetooth.h> + +#define LOG_TAG "BTIF_SM" +#include "btif_common.h" +#include "btif_sm.h" +#include "gki.h" + +/***************************************************************************** +** Constants & Macros +******************************************************************************/ + + +/***************************************************************************** +** Local type definitions +******************************************************************************/ +typedef struct { + btif_sm_state_t state; + btif_sm_handler_t *p_handlers; +} btif_sm_cb_t; + +/***************************************************************************** +** Static variables +******************************************************************************/ + +/***************************************************************************** +** Static functions +******************************************************************************/ + +/***************************************************************************** +** Externs +******************************************************************************/ + +/***************************************************************************** +** Functions +******************************************************************************/ + +/***************************************************************************** +** +** Function btif_sm_init +** +** Description Initializes the state machine with the state handlers +** The caller should ensure that the table and the corresponding +** states match. The location that 'p_handlers' points to shall +** be available until the btif_sm_shutdown API is invoked. +** +** Returns Returns a pointer to the initialized state machine handle. +** +******************************************************************************/ + +btif_sm_handle_t btif_sm_init(const btif_sm_handler_t *p_handlers, btif_sm_state_t initial_state) +{ + btif_sm_cb_t *p_cb; + + if (p_handlers == NULL) + { + BTIF_TRACE_ERROR1("%s : p_handlers is NULL", __FUNCTION__); + return NULL; + } + + p_cb = (btif_sm_cb_t*) GKI_os_malloc(sizeof(btif_sm_cb_t)); + p_cb->state = initial_state; + p_cb->p_handlers = (btif_sm_handler_t*)p_handlers; + + /* Send BTIF_SM_ENTER_EVT to the initial state */ + p_cb->p_handlers[initial_state](BTIF_SM_ENTER_EVT, NULL); + + return (btif_sm_handle_t)p_cb; +} + +/***************************************************************************** +** +** Function btif_sm_shutdown +** +** Description Tears down the state machine +** +** Returns None +** +******************************************************************************/ +void btif_sm_shutdown(btif_sm_handle_t handle) +{ + btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle; + + if (p_cb == NULL) + { + BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__); + return; + } + GKI_os_free((void*)p_cb); +} + +/***************************************************************************** +** +** Function btif_sm_get_state +** +** Description Fetches the current state of the state machine +** +** Returns Current state +** +******************************************************************************/ +btif_sm_state_t btif_sm_get_state(btif_sm_handle_t handle) +{ + btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle; + + if (p_cb == NULL) + { + BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__); + return 0; + } + + return p_cb->state; +} + +/***************************************************************************** +** +** Function btif_sm_dispatch +** +** Description Dispatches the 'event' along with 'data' to the current state handler +** +** Returns BT_STATUS_SUCCESS on success +** BT_STATUS_UNHANDLED if event was not processed +** BT_STATUS_FAIL otherwise +** +******************************************************************************/ +bt_status_t btif_sm_dispatch(btif_sm_handle_t handle, btif_sm_event_t event, + void *data) +{ + bt_status_t status = BT_STATUS_SUCCESS; + + btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle; + + if (p_cb == NULL) + { + BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__); + return BT_STATUS_FAIL; + } + + if (p_cb->p_handlers[p_cb->state](event, data) == FALSE) + return BT_STATUS_UNHANDLED; + + return status; +} + +/***************************************************************************** +** +** Function btif_sm_change_state +** +** Description Make a transition to the new 'state'. The 'BTIF_SM_EXIT_EVT' +** shall be invoked before exiting the current state. The +** 'BTIF_SM_ENTER_EVT' shall be invoked before entering the new state +** +** Returns BT_STATUS_SUCCESS on success +** BT_STATUS_UNHANDLED if event was not processed +** BT_STATUS_FAIL otherwise +** +******************************************************************************/ +bt_status_t btif_sm_change_state(btif_sm_handle_t handle, btif_sm_state_t state) +{ + bt_status_t status = BT_STATUS_SUCCESS; + btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle; + + if (p_cb == NULL) + { + BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__); + return BT_STATUS_FAIL; + } + + /* Send exit event to the current state */ + if (p_cb->p_handlers[p_cb->state](BTIF_SM_EXIT_EVT, NULL) == FALSE) + status = BT_STATUS_UNHANDLED; + + /* Change to the new state */ + p_cb->state = state; + + /* Send enter event to the new state */ + if (p_cb->p_handlers[p_cb->state](BTIF_SM_ENTER_EVT, NULL) == FALSE) + status = BT_STATUS_UNHANDLED; + + return status; +} |