esp-idf/examples/09_a2dp/components/bluedroid_demos/btif/btif_sm.c

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/******************************************************************************
*
* 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
*
*****************************************************************************/
#define LOG_TAG "bt_btif"
// #include <hardware/bluetooth.h>
#include "bt_defs.h"
#include "allocator.h"
#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_ERROR("%s : p_handlers is NULL", __FUNCTION__);
return NULL;
}
p_cb = (btif_sm_cb_t *)osi_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_ERROR("%s : Invalid handle", __FUNCTION__);
return;
}
osi_free(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_ERROR("%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_ERROR("%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_ERROR("%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;
}