linux-kernel - Re: [PATCH v2 2/2] mmc: core: Export device/vendor ids from Common CIS for SDIO cards

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Date:   Thu, 28 May 2020 12:14:51 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Behún <marek.behun@....cz>
Subject: Re: [PATCH v2 2/2] mmc: core: Export device/vendor ids from Common
 CIS for SDIO cards

On Wed, 27 May 2020 at 13:09, Pali Rohár <pali@...nel.org> wrote:
>
> Device/vendor ids from Common CIS (Card Information Structure) may be
> different as device/vendor ids from CIS on particular SDIO function.
>
> Kernel currently exports only device/vendor ids from SDIO functions and not
> "main" device/vendor ids from Common CIS.
>
> This patch exports "main" device/vendor ids for SDIO and SD combo cards at
> top level mmc device in sysfs hierarchy.
>
> Userspace can use e.g. udev rules to correctly match whole SDIO card based
> on Common CIS device/vendor id and not only one particular SDIO function.
> Having this information in userspace also helps developers to debug whole
> SDIO card as e.g. kernel mmc quirks use device/vendor ids from Common CIS
> and not from particular SDIO function. Also it allows to write userspace
> applications which list all connected SDIO cards based on CIS ids.
>
> Signed-off-by: Pali Rohár <pali@...nel.org>
> Reviewed-by: Marek Behún <marek.behun@....cz>

Applied for next, thanks!

Kind regards
Uffe


>
> ---
> Changes in V2:
> * Make sd_std_group static
> * Put more information into commit message
> ---
>  drivers/mmc/core/bus.c  |  7 +++++++
>  drivers/mmc/core/sd.c   | 26 +++++++++++++++++++++++++-
>  drivers/mmc/core/sdio.c | 20 +++++++++++++++++++-
>  3 files changed, 51 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
> index b1cb447da..70207f11a 100644
> --- a/drivers/mmc/core/bus.c
> +++ b/drivers/mmc/core/bus.c
> @@ -93,6 +93,13 @@ mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
>                         return retval;
>         }
>
> +       if (card->type == MMC_TYPE_SDIO || card->type == MMC_TYPE_SD_COMBO) {
> +               retval = add_uevent_var(env, "SDIO_ID=%04X:%04X",
> +                                       card->cis.vendor, card->cis.device);
> +               if (retval)
> +                       return retval;
> +       }
> +
>         /*
>          * SDIO (non-combo) cards are not handled by mmc_block driver and do not
>          * have accessible CID register which used by mmc_card_name() function.
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index 76c7add36..ee1a51ff6 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -707,7 +707,12 @@ static ssize_t mmc_dsr_show(struct device *dev,
>
>  static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
>
> +MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
> +MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
> +
>  static struct attribute *sd_std_attrs[] = {
> +       &dev_attr_vendor.attr,
> +       &dev_attr_device.attr,
>         &dev_attr_cid.attr,
>         &dev_attr_csd.attr,
>         &dev_attr_scr.attr,
> @@ -726,7 +731,26 @@ static struct attribute *sd_std_attrs[] = {
>         &dev_attr_dsr.attr,
>         NULL,
>  };
> -ATTRIBUTE_GROUPS(sd_std);
> +
> +static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
> +                                int index)
> +{
> +       struct device *dev = container_of(kobj, struct device, kobj);
> +       struct mmc_card *card = mmc_dev_to_card(dev);
> +
> +       /* CIS vendor and device ids are available only for Combo cards */
> +       if ((attr == &dev_attr_vendor.attr || attr == &dev_attr_device.attr) &&
> +           card->type != MMC_TYPE_SD_COMBO)
> +               return 0;
> +
> +       return attr->mode;
> +}
> +
> +static const struct attribute_group sd_std_group = {
> +       .attrs = sd_std_attrs,
> +       .is_visible = sd_std_is_visible,
> +};
> +__ATTRIBUTE_GROUPS(sd_std);
>
>  struct device_type sd_type = {
>         .groups = sd_std_groups,
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index ebb387aa5..2d86a9db5 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -27,6 +27,24 @@
>  #include "sdio_ops.h"
>  #include "sdio_cis.h"
>
> +MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
> +MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
> +MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
> +MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
> +
> +static struct attribute *sdio_std_attrs[] = {
> +       &dev_attr_vendor.attr,
> +       &dev_attr_device.attr,
> +       &dev_attr_ocr.attr,
> +       &dev_attr_rca.attr,
> +       NULL,
> +};
> +ATTRIBUTE_GROUPS(sdio_std);
> +
> +static struct device_type sdio_type = {
> +       .groups = sdio_std_groups,
> +};
> +
>  static int sdio_read_fbr(struct sdio_func *func)
>  {
>         int ret;
> @@ -598,7 +616,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
>         /*
>          * Allocate card structure.
>          */
> -       card = mmc_alloc_card(host, NULL);
> +       card = mmc_alloc_card(host, &sdio_type);
>         if (IS_ERR(card)) {
>                 err = PTR_ERR(card);
>                 goto err;
> --
> 2.20.1
>