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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2011-12-11 13:10:44 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-12-15 19:55:11 +0100 |
| commit | 597ce4cc1c3de2a58296452c1dffbfd897217f40 (patch) | |
| tree | a5e1da7636fe7a216576da6dd54f1678550c8b82 /drivers/mtd | |
| parent | 4ecd0003ac16317b9d88fdc2ebf9574f53d4160b (diff) | |
| download | barebox-597ce4cc1c3de2a58296452c1dffbfd897217f40.tar.gz barebox-597ce4cc1c3de2a58296452c1dffbfd897217f40.tar.xz | |
nand-bb: implement lseek in readonly mode
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Robert Jarzmik <robert.jarzmik@free.fr>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/nand-bb.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand-bb.c b/drivers/mtd/nand/nand-bb.c index ae84ce1e2d..73ccab38dd 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 +213,43 @@ 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; + } else { + raw_pos += bb->info.erasesize; + } + + 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, |