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/******************************************************************************
*
* Copyright (C) 2009-2012 Broadcom Corporation
*
* This program is the proprietary software of Broadcom Corporation and/or its
* licensors, and may only be used, duplicated, modified or distributed
* pursuant to the terms and conditions of a separate, written license
* agreement executed between you and Broadcom (an "Authorized License").
* Except as set forth in an Authorized License, Broadcom grants no license
* (express or implied), right to use, or waiver of any kind with respect to
* the Software, and Broadcom expressly reserves all rights in and to the
* Software and all intellectual property rights therein.
* IF YOU HAVE NO AUTHORIZED LICENSE, THEN YOU HAVE NO RIGHT TO USE THIS
* SOFTWARE IN ANY WAY, AND SHOULD IMMEDIATELY NOTIFY BROADCOM AND DISCONTINUE
* ALL USE OF THE SOFTWARE.
*
* Except as expressly set forth in the Authorized License,
*
* 1. This program, including its structure, sequence and organization,
* constitutes the valuable trade secrets of Broadcom, and you shall
* use all reasonable efforts to protect the confidentiality thereof,
* and to use this information only in connection with your use of
* Broadcom integrated circuit products.
*
* 2. TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED
* "AS IS" AND WITH ALL FAULTS AND BROADCOM MAKES NO PROMISES,
* REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY,
* OR OTHERWISE, WITH RESPECT TO THE SOFTWARE. BROADCOM SPECIFICALLY
* DISCLAIMS ANY AND ALL IMPLIED WARRANTIES OF TITLE, MERCHANTABILITY,
* NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF VIRUSES,
* ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
* CORRESPONDENCE TO DESCRIPTION. YOU ASSUME THE ENTIRE RISK ARISING
* OUT OF USE OR PERFORMANCE OF THE SOFTWARE.
*
* 3. TO THE MAXIMUM EXTENT PERMITTED BY LAW, IN NO EVENT SHALL BROADCOM
* OR ITS LICENSORS BE LIABLE FOR
* (i) CONSEQUENTIAL, INCIDENTAL, SPECIAL, INDIRECT, OR EXEMPLARY
* DAMAGES WHATSOEVER ARISING OUT OF OR IN ANY WAY RELATING TO
* YOUR USE OF OR INABILITY TO USE THE SOFTWARE EVEN IF BROADCOM
* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES; OR
* (ii) ANY AMOUNT IN EXCESS OF THE AMOUNT ACTUALLY PAID FOR THE
* SOFTWARE ITSELF OR U.S. $1, WHICHEVER IS GREATER. THESE
* LIMITATIONS SHALL APPLY NOTWITHSTANDING ANY FAILURE OF
* ESSENTIAL PURPOSE OF ANY LIMITED REMEDY.
*
*****************************************************************************/
/*****************************************************************************
*
* 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;
}
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