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NAND: Allow to read oob data 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-10-20 15:28:16 +02:00
parent 13d2d38aa2
commit c6f639fafb
2 changed files with 42 additions and 0 deletions
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41
drivers/nand/nand.c
View File

@ -29,6 +29,7 @@
#include <malloc.h>
#include <ioctl.h>
#include <nand.h>
#include <errno.h>
static ssize_t nand_read(struct cdev *cdev, void* buf, size_t count, ulong offset, ulong flags)
{
@ -158,8 +159,41 @@ static struct file_operations nand_ops = {
.erase = nand_erase,
};
static ssize_t nand_read_oob(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
{
struct mtd_info *info = cdev->priv;
struct nand_chip *chip = info->priv;
struct mtd_oob_ops ops;
int ret;
if (count < info->oobsize)
return -EINVAL;
ops.mode = MTD_OOB_RAW;
ops.ooboffs = 0;
ops.ooblen = info->oobsize;
ops.oobbuf = buf;
ops.datbuf = NULL;
ops.len = info->oobsize;
offset /= info->oobsize;
ret = info->read_oob(info, offset << chip->page_shift, &ops);
if (ret)
return ret;
return info->oobsize;
}
static struct file_operations nand_ops_oob = {
.read = nand_read_oob,
.ioctl = nand_ioctl,
.lseek = dev_lseek_default,
};
int add_mtd_device(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
strcpy(mtd->class_dev.name, "nand");
register_device(&mtd->class_dev);
@ -176,6 +210,13 @@ int add_mtd_device(struct mtd_info *mtd)
devfs_create(&mtd->cdev);
mtd->cdev_oob.ops = &nand_ops_oob;
mtd->cdev_oob.size = (mtd->size >> chip->page_shift) * mtd->oobsize;
mtd->cdev_oob.name = asprintf("nand_oob%d", mtd->class_dev.id);
mtd->cdev_oob.priv = mtd;
mtd->cdev_oob.dev = &mtd->class_dev;
devfs_create(&mtd->cdev_oob);
return 0;
}

1
include/linux/mtd/mtd.h
View File

@ -203,6 +203,7 @@ struct mtd_info {
struct device_d class_dev;
struct device_d *dev;
struct cdev cdev;
struct cdev cdev_oob;
struct param_d param_size;
char *size_str;