From 730148bc94411f13a0171204e872b0760fbde185 Mon Sep 17 00:00:00 2001 From: Brandon Maier Date: Mon, 12 Dec 2022 12:01:58 -0600 Subject: mtd-utils: Add new syntax to get devices by name This introduces a new feature to the MTD command line utilities that allows MTD devices to be referenced by name instead of device node. For example this looks like: > # Display info for the MTD device with name "data" > mtdinfo mtd:data > # Copy file to MTD device with name "data" > flashcp /my/file mtd:data This follows the syntax supported by the kernel which allows MTD device's to be mounted by name[1]. Add the function mtd_find_dev_node() that accepts an MTD "identifier" and returns the MTD's device node. The function accepts a string starting with "mtd:" which it treats as the MTD's name. It then attempts to search for the MTD, and if found maps it back to the /dev/mtdX device node. If the string does not start with "mtd:", then assume it's the old style and refers directly to a MTD device node. The function is then hooked into existing tools like flashcp, mtdinfo, flash_unlock, etc. To load in the new MTD parsing code in a consistent way across programs. [1] http://www.linux-mtd.infradead.org/faq/jffs2.html#L_mtdblock Signed-off-by: Brandon Maier Signed-off-by: David Oberhollenzer --- misc-utils/flash_unlock.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'misc-utils/flash_unlock.c') diff --git a/misc-utils/flash_unlock.c b/misc-utils/flash_unlock.c index fbbfa51..fa5decb 100644 --- a/misc-utils/flash_unlock.c +++ b/misc-utils/flash_unlock.c @@ -51,6 +51,8 @@ static NORETURN void usage(int status) " -l --lock Lock a region of flash\n" " -u --unlock Unlock a region of flash\n" "\n" + " MTD device node or 'mtd:'\n" + "\n" "If offset is not specified, it defaults to 0.\n" "If block count is not specified, it defaults to all blocks.\n" "A block count of -1 means all blocks.\n", @@ -125,7 +127,12 @@ static void process_args(int argc, char *argv[]) } /* First non-option argument */ - dev = argv[arg_idx++]; + dev = mtd_find_dev_node(argv[arg_idx]); + if (!dev) { + errmsg("MTD device not found %s", argv[arg_idx]); + usage(EXIT_FAILURE); + } + arg_idx++; /* Second non-option argument */ if (arg_idx < argc) -- cgit v1.2.3