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drivers/mtd: add mtd core hooks 

Add hooks for spinoff MTD drivers (mtdoob, mtdraw, ...).

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Robert Jarzmik 2011-12-21 22:30:42 +01:00 committed by Sascha Hauer
parent d29b112f68
commit c6c880ecdb
2 changed files with 56 additions and 0 deletions
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17
drivers/mtd/core.c
View File

@ -26,6 +26,10 @@
#include <nand.h>
#include <errno.h>
#include "mtd.h"
static LIST_HEAD(mtd_register_hooks);
static ssize_t mtd_read(struct cdev *cdev, void* buf, size_t count,
ulong offset, ulong flags)
{
@ -246,6 +250,7 @@ static void mtd_exit_oob_cdev(struct mtd_info *mtd)
int add_mtd_device(struct mtd_info *mtd, char *devname)
{
char str[16];
struct mtddev_hook *hook;
if (!devname)
devname = "mtd";
@ -272,12 +277,20 @@ int add_mtd_device(struct mtd_info *mtd, char *devname)
devfs_create(&mtd->cdev);
mtd_init_oob_cdev(mtd, devname);
list_for_each_entry(hook, &mtd_register_hooks, hook)
if (hook->add_mtd_device)
hook->add_mtd_device(mtd, devname);
return 0;
}
int del_mtd_device (struct mtd_info *mtd)
{
struct mtddev_hook *hook;
list_for_each_entry(hook, &mtd_register_hooks, hook)
if (hook->del_mtd_device)
hook->del_mtd_device(mtd);
unregister_device(&mtd->class_dev);
mtd_exit_oob_cdev(mtd);
free(mtd->param_size.value);
@ -285,3 +298,7 @@ int del_mtd_device (struct mtd_info *mtd)
return 0;
}
void mtdcore_add_hook(struct mtddev_hook *hook)
{
list_add(&hook->hook, &mtd_register_hooks);
}

39
drivers/mtd/mtd.h Normal file
View File

@ -0,0 +1,39 @@
/*
* MTD devices registration
*
* Copyright (C) 2011 Robert Jarzmik
*
* 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.
*
*/
/**
* mtddev_hook - hook to register additional mtd devices
* @add_mtd_device: called when a MTD driver calls add_mtd_device()
* @del_mtd_device: called when a MTD driver calls del_mtd_device()
*
* Provide a hook to be called whenether a add_mtd_device() is called.
* Additionnal devices like mtdoob and mtdraw subscribe to the service.
*/
struct mtddev_hook {
struct list_head hook;
int (*add_mtd_device)(struct mtd_info *mtd, char *devname);
int (*del_mtd_device)(struct mtd_info *mtd);
};
/**
* mtdcore_add_hook - add a hook to MTD registration/unregistration
* @hook: the hook
*
* Normally called in a coredevice_initcall() to add another MTD layout (such as
* mtdraw, ...)
*/
void mtdcore_add_hook(struct mtddev_hook *hook);