All,
EXT_CSD is 512byte information (read using CMD8) for the MMC (eMMC) device.
And for the latest and upcoming specification, ext_csd are much relevant then past.
So please let me know your idea to add and get the same ext_csd as MMC device attribute. This is the same way currently available for csd, cid, src, etc.
(# cat /sys/class/mmc_host/mmc1/mmc1\:0001/ext_csd)
Regards,
Sukumar Ghorai
From: Sukumar Ghorai <s-ghorai@xxxxxx>
Date: Mon, 26 Jul 2010 10:47:12 +0530
Subject: [PATCH] mmc: add device class attribute for ext_csd
ext_csd is getting more informative form eMMC 4.4 onwards and better to
have this in device information as currently available for csd, cid, src.
Signed-off-by: Sukumar Ghorai <s-ghorai@xxxxxx>
---
drivers/mmc/core/bus.c | 1 +
drivers/mmc/core/mmc.c | 23 +++++++++++++++++------
include/linux/mmc/card.h | 1 +
3 files changed, 19 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 49d9dca..57d035e 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -191,6 +191,7 @@ static void mmc_release_card(struct device *dev)
if (card->info)
kfree(card->info);
+ kfree(card->raw_ext_csd);
kfree(card);
}
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 89f7a25..23b1813 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -167,10 +167,6 @@ static int mmc_read_ext_csd(struct mmc_card *card)
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
return 0;
- /*
- * As the ext_csd is so large and mostly unused, we don't store the
- * raw block in mmc_card.
- */
ext_csd = kmalloc(512, GFP_KERNEL);
if (!ext_csd) {
printk(KERN_ERR "%s: could not allocate a buffer to "
@@ -250,11 +246,25 @@ static int mmc_read_ext_csd(struct mmc_card *card)
}
out:
- kfree(ext_csd);
-
+ card->raw_ext_csd = ext_csd;
return err;
}
+static ssize_t mmc_ext_csd_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+int i;
+struct mmc_card *card = container_of(dev, struct mmc_card, dev);
+
+ for (i = 0; i < 512; i++)
+ buf += sprintf(buf, "%02x", card->raw_ext_csd[i]);
+
+ buf -= 512;
+ return 512;
+}
+
+static DEVICE_ATTR(ext_csd, S_IRUGO, mmc_ext_csd_show, NULL);
+
MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
card->raw_cid[2], card->raw_cid[3]);
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
@@ -270,6 +280,7 @@ MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
static struct attribute *mmc_std_attrs[] = {
&dev_attr_cid.attr,
&dev_attr_csd.attr,
+ &dev_attr_ext_csd.attr,
&dev_attr_date.attr,
&dev_attr_fwrev.attr,
&dev_attr_hwrev.attr,
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index d02d2c6..00332ca 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -105,6 +105,7 @@ struct mmc_card {
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
u32 raw_scr[2]; /* raw card SCR */
+ u8 *raw_ext_csd; /* raw card EXT CSD for MMC */
struct mmc_cid cid; /* card identification */
struct mmc_csd csd; /* card specific */
struct mmc_ext_csd ext_csd; /* mmc v4 extended card specific */
Attachment:
emmc-dev-attr-ext-esd.patch
Description: emmc-dev-attr-ext-esd.patch
