[U-Boot] [PATCH] usb: ums - expose selected partition/s v2

[Lukasz Majewski <l.majewski@samsung.com>]

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@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