u-boot/include/event_internal.h
Simon Glass 87a5d1b5d0 event: Add basic support for events
Add a way to create and dispatch events without needing to allocate
memory. Also add a way to 'spy' on events, thus allowing 'hooks' to be
created.

Use a linker list for static events, which we can use to replace functions
like arch_cpu_init_f(). Allow an EVENT_DEBUG option which makes it
easier to see what is going on at runtime, but uses more code space.

Dynamic events allow the creation of a spy at runtime. This is not always
necessary, but can be enabled with EVENT_DYNAMIC if needed.

A 'test' event is the only option for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
2022-03-10 08:28:36 -05:00

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C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Internal definitions for events
*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __event_internal_h
#define __event_internal_h
#include <event.h>
#include <linux/list.h>
/**
* struct event_spy - a spy that watches for an event of a particular type
*
* @id: Spy ID
* @type: Event type to subscribe to
* @func: Function to call when the event is sent
* @ctx: Context to pass to the function
*/
struct event_spy {
struct list_head sibling_node;
const char *id;
enum event_t type;
event_handler_t func;
void *ctx;
};
struct event_state {
struct list_head spy_head;
};
#endif