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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* This file contains all of the functionality common to all state machine
* object implementations.
*
*
*/
#include "state_machine.h"
static void sci_state_machine_exit_state(struct sci_base_state_machine *sm)
{
u32 state = sm->current_state_id;
sci_state_transition_t exit = sm->state_table[state].exit_state;
if (exit)
exit(sm->state_machine_owner);
}
static void sci_state_machine_enter_state(struct sci_base_state_machine *sm)
{
u32 state = sm->current_state_id;
sci_state_transition_t enter = sm->state_table[state].enter_state;
if (enter)
enter(sm->state_machine_owner);
}
/*
* ******************************************************************************
* * P R O T E C T E D M E T H O D S
* ****************************************************************************** */
/**
* This method will set the initial state and state table for the state
* machine. The caller should follow this request with the initialize
* request to cause the state machine to start.
* @sm: This parameter provides the state machine object to be
* constructed.
* @state_machine_owner: This parameter indicates the object that is owns the
* state machine being constructed.
* @state_table: This parameter specifies the table of state objects that is
* managed by this state machine.
* @initial_state: This parameter specifies the value of the initial state for
* this state machine.
*
*/
void sci_base_state_machine_construct(struct sci_base_state_machine *sm,
void *owner,
const struct sci_base_state *state_table,
u32 initial_state)
{
sm->state_machine_owner = owner;
sm->initial_state_id = initial_state;
sm->previous_state_id = initial_state;
sm->current_state_id = initial_state;
sm->state_table = state_table;
}
/**
* This method will cause the state machine to enter the initial state.
* @sm: This parameter specifies the state machine that is to
* be started.
*
* sci_base_state_machine_construct() for how to set the initial state none
*/
void sci_base_state_machine_start(struct sci_base_state_machine *sm)
{
sm->current_state_id = sm->initial_state_id;
sci_state_machine_enter_state(sm);
}
/**
* This method will cause the state machine to exit it's current state only.
* @sm: This parameter specifies the state machine that is to
* be stopped.
*
*/
void sci_base_state_machine_stop(
struct sci_base_state_machine *sm)
{
sci_state_machine_exit_state(sm);
}
/**
* This method performs an update to the current state of the state machine.
* @sm: This parameter specifies the state machine for which
* the caller wishes to perform a state change.
* @next_state: This parameter specifies the new state for the state machine.
*
*/
void sci_base_state_machine_change_state(
struct sci_base_state_machine *sm,
u32 next_state)
{
sci_state_machine_exit_state(sm);
sm->previous_state_id = sm->current_state_id;
sm->current_state_id = next_state;
sci_state_machine_enter_state(sm);
}
/**
* This method simply returns the current state of the state machine to the
* caller.
* @sm: This parameter specifies the state machine for which to
* retrieve the current state.
*
* This method returns a u32 value indicating the current state for the
* supplied state machine.
*/
u32 sci_base_state_machine_get_state(struct sci_base_state_machine *sm)
{
return sm->current_state_id;
}
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