linux-kernel - [PATCH] MMC: Add Extended CSD as a device attribute

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Date:	Wed, 14 Jan 2009 18:23:35 +0200
From:	Adrian Hunter <ext-adrian.hunter@...ia.com>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] MMC: Add Extended CSD as a device attribute


Signed-off-by: Adrian Hunter <ext-adrian.hunter@...ia.com>
---
 drivers/mmc/core/mmc.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 3f5b089..29291de 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -259,6 +259,34 @@ MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 
+static ssize_t mmc_ext_csd_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct mmc_card *card = container_of(dev, struct mmc_card, dev);
+	ssize_t n = 0;
+	u8 *ext_csd;
+	int err, i;
+
+	ext_csd = kmalloc(512, GFP_KERNEL);
+	if (!ext_csd)
+		return 0;
+
+	mmc_claim_host(card->host);
+	err = mmc_send_ext_csd(card, ext_csd);
+	mmc_release_host(card->host);
+
+	if (!err) {
+		for (i = 511; i >= 0; i--)
+			n += sprintf(buf + n, "%02x", (unsigned)ext_csd[i]);
+		n += sprintf(buf + n, "\n");
+	}
+
+	kfree(ext_csd);
+
+	return n;
+}
+
+static DEVICE_ATTR(ext_csd, S_IRUGO, mmc_ext_csd_show, NULL);
+
 static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_cid.attr,
 	&dev_attr_csd.attr,
@@ -269,6 +297,7 @@ static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_name.attr,
 	&dev_attr_oemid.attr,
 	&dev_attr_serial.attr,
+	&dev_attr_ext_csd.attr,
 	NULL,
 };
 
-- 
1.5.4.3
--
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