From: Sascha Hauer <s.hauer@pengutronix.de>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH v3 2/2] mci: implement command to switch a mmc device to enhanced mode
Date: Wed, 10 Oct 2018 08:44:29 +0200 [thread overview]
Message-ID: <20181010064429.dbslv4umft4fetdk@pengutronix.de> (raw)
In-Reply-To: <20181008082921.26922-2-u.kleine-koenig@pengutronix.de>
On Mon, Oct 08, 2018 at 10:29:21AM +0200, Uwe Kleine-König wrote:
> The command structure allows adding more subcommands and is designed to
> match the Linux program mmc from the mmc-utils. So later more commands
> can easily be added if need be.
>
> Compared to mmc-utils'
>
> mmc enh_area set <-y|-n|-c> <start KiB> <length KiB> <device>
>
> the command that is implemented here (
>
> mmc enh_area setmax [-c] <device>
>
> ) is easier to use (because you don't have to check the maximal allowed
> size by reading some registers and calculate the available size from
> them (which then must be calculated back to register values by the mmc
> command)) but less flexible as it doesn't allow all the crazy
> possibilities specified in the eMMC standard but just creates an
> enhanced area with maximal size.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> +static u8 *mci_get_ext_csd(struct mci *mci)
> +{
> + u8 *ext_csd;
> + int ret;
> +
> + ext_csd = xmalloc(512);
> +
> + ret = mci_send_ext_csd(mci, ext_csd);
> + if (ret) {
> + printf("Failure to read EXT_CSD register\n");
> + return ERR_PTR(-EIO);
Please free malloced memory.
> + }
> +
> + return ext_csd;
> +}
> +
> +/* enh_area setmax [-c] /dev/mmcX */
> +static int do_mmc_enh_area(int argc, char *argv[])
> +{
> + char *devpath;
> + struct mci *mci;
> + u8 *ext_csd;
> + int set_completed = 0;
> + int ret;
> +
> + if (argc < 2 || strcmp(argv[1], "setmax") != 0)
> + goto usage;
> +
> + if (argc == 3) {
> + /* enh_area setmax /dev/mmcX */
> + devpath = argv[2];
> + set_completed = false;
> + } else if (argc == 4 || strcmp(argv[2], "-c") == 0) {
> + /* enh_area setmax -c /dev/mmcX */
> + devpath = argv[3];
> + set_completed = true;
> + } else {
This option parsing already is quite hard to read and will be harder if
it is extended in the future. Can't we use getopt() here?
Usage:
enh_area [options] <mmcdev>
-m Use maximum available space
-c complete partitioning
Sascha
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next prev parent reply other threads:[~2018-10-10 6:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-19 13:28 [PATCH v2 1/2] mci: drop unused parameter from mci_switch() Uwe Kleine-König
2018-01-19 13:28 ` [PATCH v2 2/2] mci: implement command to switch a mmc device to enhanced mode Uwe Kleine-König
2018-01-22 8:12 ` Sascha Hauer
2018-10-02 8:33 ` Uwe Kleine-König
2018-10-08 7:49 ` Sascha Hauer
2018-10-08 8:29 ` [PATCH v3 1/2] mci: provide wrapper for mci_get_device_by_name ∘ devpath_to_name Uwe Kleine-König
2018-10-08 8:29 ` [PATCH v3 2/2] mci: implement command to switch a mmc device to enhanced mode Uwe Kleine-König
2018-10-10 6:44 ` Sascha Hauer [this message]
2018-10-02 9:03 ` [PATCH v2] " Uwe Kleine-König
2018-01-22 8:48 ` [PATCH v2 1/2] mci: drop unused parameter from mci_switch() Sascha Hauer
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