u-boot/include/env_callback.h

/*
 * (C) Copyright 2012
 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef __ENV_CALLBACK_H__
#define __ENV_CALLBACK_H__

#include <env_flags.h>
#include <linker_lists.h>
#include <search.h>

#define ENV_CALLBACK_VAR ".callbacks"

/* Board configs can define additional static callback bindings */
#ifndef CONFIG_ENV_CALLBACK_LIST_STATIC
#define CONFIG_ENV_CALLBACK_LIST_STATIC
#endif

#ifdef CONFIG_SILENT_CONSOLE
#define SILENT_CALLBACK "silent:silent,"
#else
#define SILENT_CALLBACK
#endif

/*
 * This list of callback bindings is static, but may be overridden by defining
 * a new association in the ".callbacks" environment variable.
 */
#define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \
	ENV_FLAGS_VAR ":flags," \
	"baudrate:baudrate," \
	"bootfile:bootfile," \
	"loadaddr:loadaddr," \
	SILENT_CALLBACK \
	"stdin:console,stdout:console,stderr:console," \
	CONFIG_ENV_CALLBACK_LIST_STATIC

struct env_clbk_tbl {
	const char *name;		/* Callback name */
	int (*callback)(const char *name, const char *value, enum env_op op,
		int flags);
};

struct env_clbk_tbl *find_env_callback(const char *);
void env_callback_init(ENTRY *var_entry);

/*
 * Define a callback that can be associated with variables.
 * when associated through the ".callbacks" environment variable, the callback
 * will be executed any time the variable is inserted, overwritten, or deleted.
 */
#ifdef CONFIG_SPL_BUILD
#define U_BOOT_ENV_CALLBACK(name, callback) \
	static inline void _u_boot_env_noop_##name(void) \
	{ \
		(void)callback; \
	}
#else
#define U_BOOT_ENV_CALLBACK(name, callback) \
	ll_entry_declare(struct env_clbk_tbl, name, env_clbk, env_clbk) = \
	{#name, callback}
#endif

#endif /* __ENV_CALLBACK_H__ */