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mtd: implement mtd_lock and mtd_unlock 

Needed for NOR flashes.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2012-04-19 20:12:56 +02:00
parent bdd58b17eb
commit 1bd90ff5a1
2 changed files with 39 additions and 0 deletions
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37
drivers/mtd/core.c
View File

@ -95,6 +95,20 @@ static int mtd_op_erase(struct cdev *cdev, size_t count, loff_t offset)
return 0;
}
static ssize_t mtd_op_protect(struct cdev *cdev, size_t count, loff_t offset, int prot)
{
struct mtd_info *mtd = cdev->priv;
if (!mtd->unlock || !mtd->lock)
return -ENOSYS;
if (prot)
return mtd_lock(mtd, offset, count);
else
return mtd_unlock(mtd, offset, count);
}
#endif /* CONFIG_MTD_WRITE */
int mtd_ioctl(struct cdev *cdev, int request, void *buf)
@ -161,6 +175,28 @@ int mtd_ioctl(struct cdev *cdev, int request, void *buf)
return ret;
}
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
if (!mtd->lock)
return -EOPNOTSUPP;
if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
return -EINVAL;
if (!len)
return 0;
return mtd->lock(mtd, ofs, len);
}
int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
if (!mtd->unlock)
return -EOPNOTSUPP;
if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
return -EINVAL;
if (!len)
return 0;
return mtd->unlock(mtd, ofs, len);
}
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
if (!mtd->block_isbad)
@ -206,6 +242,7 @@ static struct file_operations mtd_ops = {
#ifdef CONFIG_MTD_WRITE
.write = mtd_op_write,
.erase = mtd_op_erase,
.protect = mtd_op_protect,
#endif
.ioctl = mtd_ioctl,
.lseek = dev_lseek_default,

2
include/linux/mtd/mtd.h
View File

@ -257,6 +257,8 @@ static inline void mtd_erase_callback(struct erase_info *instr)
}
#endif
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);