Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/mtd/nand/nand-bb.c | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/nand/nand-bb.c b/drivers/mtd/nand/nand-bb.c
index ae84ce1..1482374 100644
--- a/drivers/mtd/nand/nand-bb.c
+++ b/drivers/mtd/nand/nand-bb.c
@@ -45,6 +45,7 @@ struct nand_bb {
size_t raw_size;
size_t size;
off_t offset;
+ unsigned long flags;
void *writebuf;
struct cdev cdev;
@@ -171,6 +172,7 @@ static int nand_bb_open(struct cdev *cdev, unsigned long flags)
if (bb->open)
return -EBUSY;
+ bb->flags = flags;
bb->open = 1;
bb->offset = 0;
bb->needs_write = 0;
@@ -211,10 +213,40 @@ static int nand_bb_calc_size(struct nand_bb *bb)
return 0;
}
+static off_t nand_bb_lseek(struct cdev *cdev, off_t __offset)
+{
+ struct nand_bb *bb = cdev->priv;
+ unsigned long raw_pos = 0;
+ uint32_t offset = __offset;
+ int ret;
+
+ /* lseek only in readonly mode */
+ if (bb->flags & O_ACCMODE)
+ return -ENOSYS;
+
+ while (raw_pos < bb->raw_size) {
+ off_t now = min(offset, bb->info.erasesize);
+
+ ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)raw_pos);
+ if (ret < 0)
+ return ret;
+ if (!ret)
+ offset -= now;
+ raw_pos += now;
+ if (!offset) {
+ bb->offset = raw_pos;
+ return __offset;
+ }
+ }
+
+ return -EINVAL;
+}
+
static struct file_operations nand_bb_ops = {
.open = nand_bb_open,
.close = nand_bb_close,
.read = nand_bb_read,
+ .lseek = nand_bb_lseek,
#ifdef CONFIG_NAND_WRITE
.write = nand_bb_write,
.erase = nand_bb_erase,
--
1.7.7.3
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