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/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/*****************************************************************************
*
* Filename: btc_sm.c
*
* Description: Generic BTC state machine API
*
*****************************************************************************/
#include "common/bt_target.h"
#include "common/bt_defs.h"
#include "osi/allocator.h"
#include "btc/btc_common.h"
#include "btc/btc_sm.h"
#if BTC_SM_INCLUDED
/*****************************************************************************
** Constants & Macros
******************************************************************************/
/*****************************************************************************
** Local type definitions
******************************************************************************/
typedef struct {
btc_sm_state_t state;
btc_sm_handler_t *p_handlers;
} btc_sm_cb_t;
/*****************************************************************************
** Static variables
******************************************************************************/
/*****************************************************************************
** Static functions
******************************************************************************/
/*****************************************************************************
** Externs
******************************************************************************/
/*****************************************************************************
** Functions
******************************************************************************/
/*****************************************************************************
**
** Function btc_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 btc_sm_shutdown API is invoked.
**
** Returns Returns a pointer to the initialized state machine handle.
**
******************************************************************************/
btc_sm_handle_t btc_sm_init(const btc_sm_handler_t *p_handlers, btc_sm_state_t initial_state)
{
btc_sm_cb_t *p_cb;
if (p_handlers == NULL) {
BTC_TRACE_ERROR("%s : p_handlers is NULL", __FUNCTION__);
return NULL;
}
p_cb = (btc_sm_cb_t *)osi_malloc(sizeof(btc_sm_cb_t));
p_cb->state = initial_state;
p_cb->p_handlers = (btc_sm_handler_t *)p_handlers;
/* Send BTC_SM_ENTER_EVT to the initial state */
p_cb->p_handlers[initial_state](BTC_SM_ENTER_EVT, NULL);
return (btc_sm_handle_t)p_cb;
}
/*****************************************************************************
**
** Function btc_sm_shutdown
**
** Description Tears down the state machine
**
** Returns None
**
******************************************************************************/
void btc_sm_shutdown(btc_sm_handle_t handle)
{
btc_sm_cb_t *p_cb = (btc_sm_cb_t *)handle;
if (p_cb == NULL) {
BTC_TRACE_ERROR("%s : Invalid handle", __FUNCTION__);
return;
}
osi_free(p_cb);
}
/*****************************************************************************
**
** Function btc_sm_get_state
**
** Description Fetches the current state of the state machine
**
** Returns Current state
**
******************************************************************************/
btc_sm_state_t btc_sm_get_state(btc_sm_handle_t handle)
{
btc_sm_cb_t *p_cb = (btc_sm_cb_t *)handle;
if (p_cb == NULL) {
BTC_TRACE_ERROR("%s : Invalid handle", __FUNCTION__);
return 0;
}
return p_cb->state;
}
/*****************************************************************************
**
** Function btc_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 btc_sm_dispatch(btc_sm_handle_t handle, btc_sm_event_t event,
void *data)
{
bt_status_t status = BT_STATUS_SUCCESS;
btc_sm_cb_t *p_cb = (btc_sm_cb_t *)handle;
if (p_cb == NULL) {
BTC_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 btc_sm_change_state
**
** Description Make a transition to the new 'state'. The 'BTC_SM_EXIT_EVT'
** shall be invoked before exiting the current state. The
** 'BTC_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 btc_sm_change_state(btc_sm_handle_t handle, btc_sm_state_t state)
{
bt_status_t status = BT_STATUS_SUCCESS;
btc_sm_cb_t *p_cb = (btc_sm_cb_t *)handle;
if (p_cb == NULL) {
BTC_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](BTC_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](BTC_SM_ENTER_EVT, NULL) == FALSE) {
status = BT_STATUS_UNHANDLED;
}
return status;
}
#endif /* #if BTC_SM_INCLUDED */
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