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/*
* MTD oob device
*
* Copyright (C) 2011 Sascha Hauer
*
* 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.
*
* Adds a character devices :
* - mtdoob<N>
*/
#include <common.h>
#include <init.h>
#include <malloc.h>
#include <ioctl.h>
#include <errno.h>
#include <linux/mtd/mtd.h>
#include "mtd.h"
struct mtdoob {
struct cdev cdev;
struct mtd_info *mtd;
};
static struct mtd_info *to_mtd(struct cdev *cdev)
{
struct mtdoob *mtdoob = cdev->priv;
return mtdoob->mtd;
}
static ssize_t mtd_op_read_oob(struct cdev *cdev, void *buf, size_t count,
loff_t _offset, ulong flags)
{
struct mtd_info *mtd = to_mtd(cdev);
struct mtd_oob_ops ops;
int ret;
unsigned long offset = _offset;
if (count < mtd->oobsize)
return -EINVAL;
ops.mode = MTD_OPS_RAW;
ops.ooboffs = 0;
ops.ooblen = mtd->oobsize;
ops.oobbuf = buf;
ops.datbuf = NULL;
ops.len = mtd->oobsize;
offset /= mtd->oobsize;
ret = mtd_read_oob(mtd, offset * mtd->writesize, &ops);
if (ret)
return ret;
return mtd->oobsize;
}
static struct cdev_operations mtd_ops_oob = {
.read = mtd_op_read_oob,
.ioctl = mtd_ioctl,
.lseek = dev_lseek_default,
};
static int add_mtdoob_device(struct mtd_info *mtd, const char *devname, void **priv)
{
struct mtdoob *mtdoob;
if (mtd->master || mtd->oobsize == 0)
return 0;
mtdoob = xzalloc(sizeof(*mtdoob));
mtdoob->cdev.ops = &mtd_ops_oob;
mtdoob->cdev.size = mtd_div_by_wb(mtd->size, mtd) * mtd->oobsize;
mtdoob->cdev.name = basprintf("%s.oob", mtd->cdev.name);
mtdoob->cdev.priv = mtdoob;
mtdoob->cdev.dev = &mtd->class_dev;
mtdoob->mtd = mtd;
*priv = mtdoob;
devfs_create(&mtdoob->cdev);
return 0;
}
static int del_mtdoob_device(struct mtd_info *mtd, void **priv)
{
struct mtdoob *mtdoob;
if (mtd->master || mtd->oobsize == 0)
return 0;
mtdoob = *priv;
devfs_remove(&mtdoob->cdev);
free(mtdoob);
return 0;
}
static struct mtddev_hook mtdoob_hook = {
.add_mtd_device = add_mtdoob_device,
.del_mtd_device = del_mtdoob_device,
};
static int __init register_mtdoob(void)
{
mtdcore_add_hook(&mtdoob_hook);
return 0;
}
coredevice_initcall(register_mtdoob);
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