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mtd: uboot: search for an equivalent MTD name with the mtdids

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Using an MTD device (resp. partition) name in mtdparts is simple and
straightforward. However, for a long time already, another name was
given in mtdparts to indicate a device (resp. partition) so the
"mtdids" environment variable was created to do the match.

Let's create a function that, from an MTD device (resp. partition)
name, search for the equivalent name in the "mtdparts" environment
variable thanks to the "mtdids" string.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Miquel Raynal 2018-09-29 12:58:26 +02:00 committed by Jagan Teki
parent 21cc1fb5af
commit ff4afa8a98
2 changed files with 69 additions and 1 deletions
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65
drivers/mtd/mtd_uboot.c
View file

@ -5,7 +5,70 @@
*/
#include <common.h>
#include <linux/mtd/mtd.h>
#include <jffs2/jffs2.h>
#include <jffs2/jffs2.h> /* Legacy */
/**
* mtd_search_alternate_name - Search an alternate name for @mtdname thanks to
* the mtdids legacy environment variable.
*
* The mtdids string is a list of comma-separated 'dev_id=mtd_id' tupples.
* Check if one of the mtd_id matches mtdname, in this case save dev_id in
* altname.
*
* @mtdname: Current MTD device name
* @altname: Alternate name to return
* @max_len: Length of the alternate name buffer
*
* @return 0 on success, an error otherwise.
*/
int mtd_search_alternate_name(const char *mtdname, char *altname,
unsigned int max_len)
{
const char *mtdids, *equal, *comma, *dev_id, *mtd_id;
int dev_id_len, mtd_id_len;
mtdids = env_get("mtdids");
if (!mtdids)
return -EINVAL;
do {
/* Find the '=' sign */
dev_id = mtdids;
equal = strchr(dev_id, '=');
if (!equal)
break;
dev_id_len = equal - mtdids;
mtd_id = equal + 1;
/* Find the end of the tupple */
comma = strchr(mtdids, ',');
if (comma)
mtd_id_len = comma - mtd_id;
else
mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1;
if (!dev_id_len || !mtd_id_len)
return -EINVAL;
if (dev_id_len + 1 > max_len)
continue;
/* Compare the name we search with the current mtd_id */
if (!strncmp(mtdname, mtd_id, mtd_id_len)) {
strncpy(altname, dev_id, dev_id_len);
altname[dev_id_len] = 0;
return 0;
}
/* Go to the next tupple */
mtdids = comma + 1;
} while (comma);
return -EINVAL;
}
/* Legacy */
static int get_part(const char *partname, int *idx, loff_t *off, loff_t *size,
loff_t *maxsize, int devtype)

5
include/linux/mtd/mtd.h
View file

@ -549,5 +549,10 @@ int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
const uint64_t length, uint64_t *len_incl_bad,
int *truncated);
/* drivers/mtd/mtd_uboot.c */
int mtd_search_alternate_name(const char *mtdname, char *altname,
unsigned int max_len);
#endif
#endif /* __MTD_MTD_H__ */