[U-Boot] [PATCH] usb: ums - expose selected partition/s v2
Lukasz Majewski
l.majewski at samsung.com
Wed Apr 13 16:59:13 CEST 2016
Hi John,
> By applying this patch, it will give us some flexibility to expose
> a selected partition/s.
>
> e.g:
> 1. To expose several partitions
> ums 0 mmc 0:1,0:6
>
> 2. To expose the all partitions
> ums 0 mmc 0:0
During testing, I've found one issue with this code:
Traditionally the ums command was invoked as:
'ums 0 0'
or
'ums 0 mmc 0'
which exposed all SD|eMMC partitions.
Now, when I run 'ums 0 mmc 0' I can only see the first partition.
Could you add some code to preserve the legacy behavior?
I mean all partitions should be exposed when one types:
'ums 0 0' or 'ums 0 mmc 0' or 'ums 0 mmc 0.0'
>
> 3. To expose multiple partititions on several devices
> ums 0 mmc 0:1,1:6
>
> Signed-off-by: John Tobias <john.tobias.ph at gmail.com>
> ---
> cmd/usb_mass_storage.c | 32 ++++++++++++++++++++++----------
> 1 file changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/cmd/usb_mass_storage.c b/cmd/usb_mass_storage.c
> index 14eed98..0b49e87 100644
> --- a/cmd/usb_mass_storage.c
> +++ b/cmd/usb_mass_storage.c
> @@ -50,14 +50,16 @@ static void ums_fini(void)
>
> #define UMS_NAME_LEN 16
>
> -static int ums_init(const char *devtype, const char *devnums)
> +static int ums_init(const char *devtype, const char
> *devnums_part_str) {
> - char *s, *t, *devnum, *name;
> + char *s, *t, *devnum_part_str, *name;
> struct blk_desc *block_dev;
> + disk_partition_t info;
> + int partnum;
> int ret;
> struct ums *ums_new;
>
> - s = strdup(devnums);
> + s = strdup(devnums_part_str);
> if (!s)
> return -1;
>
> @@ -65,12 +67,14 @@ static int ums_init(const char *devtype, const
> char *devnums) ums_count = 0;
>
> for (;;) {
> - devnum = strsep(&t, ",");
> - if (!devnum)
> + devnum_part_str = strsep(&t, ",");
> + if (!devnum_part_str)
> break;
>
> - ret = blk_get_device_by_str(devtype, devnum,
> &block_dev);
> - if (ret < 0)
> + partnum = blk_get_device_part_str(devtype,
> devnum_part_str,
> + &block_dev, &info, 1);
> +
> + if (partnum < 0)
> goto cleanup;
>
> /* f_mass_storage.c assumes SECTOR_SIZE sectors */
> @@ -86,10 +90,18 @@ static int ums_init(const char *devtype, const
> char *devnums) }
> ums = ums_new;
>
> + /* if partnum = 0, expose the whole device */
> + if (partnum == 0) {
> + ums[ums_count].start_sector = 0;
> + ums[ums_count].num_sectors = block_dev->lba;
> + } else {
> + ums[ums_count].start_sector = info.start;
> + ums[ums_count].num_sectors = info.size;
> + }
> +
> ums[ums_count].read_sector = ums_read_sector;
> ums[ums_count].write_sector = ums_write_sector;
> - ums[ums_count].start_sector = 0;
> - ums[ums_count].num_sectors = block_dev->lba;
> +
> name = malloc(UMS_NAME_LEN);
> if (!name) {
> ret = -1;
> @@ -230,6 +242,6 @@ cleanup_ums_init:
>
> U_BOOT_CMD(ums, 4, 1, do_usb_mass_storage,
> "Use the UMS [USB Mass Storage]",
> - "<USB_controller> [<devtype>] <devnum> e.g. ums 0 mmc 0\n"
> + "<USB_controller> [<devtype>] <dev:part> e.g. ums 0 mmc
> 0:0\n" " devtype defaults to mmc"
> );
--
Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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