Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
4 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
5 */
6
7/*
8 * Generic state machine framework.
9 */
10#include "efc.h"
11#include "efc_sm.h"
12
13/**
14 * efc_sm_post_event() - Post an event to a context.
15 *
16 * @ctx: State machine context
17 * @evt: Event to post
18 * @data: Event-specific data (if any)
19 */
20int
21efc_sm_post_event(struct efc_sm_ctx *ctx,
22 enum efc_sm_event evt, void *data)
23{
24 if (!ctx->current_state)
25 return -EIO;
26
27 ctx->current_state(ctx, evt, data);
28 return 0;
29}
30
31void
32efc_sm_transition(struct efc_sm_ctx *ctx,
33 void (*state)(struct efc_sm_ctx *,
34 enum efc_sm_event, void *), void *data)
35
36{
37 if (ctx->current_state == state) {
38 efc_sm_post_event(ctx, EFC_EVT_REENTER, data);
39 } else {
40 efc_sm_post_event(ctx, EFC_EVT_EXIT, data);
41 ctx->current_state = state;
42 efc_sm_post_event(ctx, EFC_EVT_ENTER, data);
43 }
44}
45
46static char *event_name[] = EFC_SM_EVENT_NAME;
47
48const char *efc_sm_event_name(enum efc_sm_event evt)
49{
50 if (evt > EFC_EVT_LAST)
51 return "unknown";
52
53 return event_name[evt];
54}