// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
 */

/*
 * Generic state machine framework.
 */
#include "efc.h"
#include "efc_sm.h"

/**
 * efc_sm_post_event() - Post an event to a context.
 *
 * @ctx: State machine context
 * @evt: Event to post
 * @data: Event-specific data (if any)
 */
int
efc_sm_post_event(struct efc_sm_ctx *ctx,
                  enum efc_sm_event evt, void *data)
{
        if (!ctx->current_state)
                return -EIO;

        ctx->current_state(ctx, evt, data);
        return 0;
}

void
efc_sm_transition(struct efc_sm_ctx *ctx,
                  void (*state)(struct efc_sm_ctx *,
                                enum efc_sm_event, void *), void *data)

{
        if (ctx->current_state == state) {
                efc_sm_post_event(ctx, EFC_EVT_REENTER, data);
        } else {
                efc_sm_post_event(ctx, EFC_EVT_EXIT, data);
                ctx->current_state = state;
                efc_sm_post_event(ctx, EFC_EVT_ENTER, data);
        }
}

static char *event_name[] = EFC_SM_EVENT_NAME;

const char *efc_sm_event_name(enum efc_sm_event evt)
{
        if (evt > EFC_EVT_LAST)
                return "unknown";

        return event_name[evt];
}