[people/ms/u-boot.git] / 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 <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

/*
 * 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," \
	"bootfile:bootfile," \
	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.
 */
#define U_BOOT_ENV_CALLBACK(name, callback) \
	ll_entry_declare(struct env_clbk_tbl, name, env_clbk, env_clbk) = \
	{#name, callback}

#endif /* __ENV_CALLBACK_H__ */
Commit	Line	Data
170ab110 JH	1	/*
	2	* (C) Copyright 2012
	3	* Joe Hershberger, National Instruments, joe.hershberger@ni.com
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	#ifndef __ENV_CALLBACK_H__
	25	#define __ENV_CALLBACK_H__
	26
	27	#include <linker_lists.h>
	28	#include <search.h>
	29
	30	#define ENV_CALLBACK_VAR ".callbacks"
	31
	32	/* Board configs can define additional static callback bindings */
	33	#ifndef CONFIG_ENV_CALLBACK_LIST_STATIC
	34	#define CONFIG_ENV_CALLBACK_LIST_STATIC
	35	#endif
	36
	37	/*
	38	* This list of callback bindings is static, but may be overridden by defining
	39	* a new association in the ".callbacks" environment variable.
	40	*/
	41	#define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \
a9f51c9b	42	"bootfile:bootfile," \
170ab110 JH	43	CONFIG_ENV_CALLBACK_LIST_STATIC
	44
	45	struct env_clbk_tbl {
	46	const char name; / Callback name */
	47	int (callback)(const char name, const char *value, enum env_op op,
	48	int flags);
	49	};
	50
	51	struct env_clbk_tbl find_env_callback(const char );
	52	void env_callback_init(ENTRY *var_entry);
	53
	54	/*
	55	* Define a callback that can be associated with variables.
	56	* when associated through the ".callbacks" environment variable, the callback
	57	* will be executed any time the variable is inserted, overwritten, or deleted.
	58	*/
	59	#define U_BOOT_ENV_CALLBACK(name, callback) \
	60	ll_entry_declare(struct env_clbk_tbl, name, env_clbk, env_clbk) = \
	61	{#name, callback}
	62
	63	#endif /* __ENV_CALLBACK_H__ */