[PATCH] mmc: Add in support to expose PRV for v4 MMCs

[Bernie Thompson <bhthompson@chromium.org>]

The JEDEC MMC v4 spec defines a new PRV value in place of the original
fwrev and hwrev specified in v1. We can expose this in the kernel to enable
user space to more easily determine the product revision of a given MMC.

Signed-off-by: Bernie Thompson <bhthompson@chromium.org>
---
 Documentation/mmc/mmc-dev-attrs.txt | 1 +
 drivers/mmc/core/mmc.c              | 3 +++
 include/linux/mmc/card.h            | 1 +
 3 files changed, 5 insertions(+)

diff --git a/Documentation/mmc/mmc-dev-attrs.txt b/Documentation/mmc/mmc-dev-attrs.txt
index 0d98fac..189bab0 100644
--- a/Documentation/mmc/mmc-dev-attrs.txt
+++ b/Documentation/mmc/mmc-dev-attrs.txt
@@ -22,6 +22,7 @@ All attributes are read-only.
 	manfid			Manufacturer ID (from CID Register)
 	name			Product Name (from CID Register)
 	oemid			OEM/Application ID (from CID Register)
+	prv			Product Revision (from CID Register) (SD and MMCv4 only)
 	serial			Product Serial Number (from CID Register)
 	erase_size		Erase group size
 	preferred_erase_size	Preferred erase size
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index c8f3d6e..d584f7c 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -96,6 +96,7 @@ static int mmc_decode_cid(struct mmc_card *card)
 		card->cid.prod_name[3]	= UNSTUFF_BITS(resp, 72, 8);
 		card->cid.prod_name[4]	= UNSTUFF_BITS(resp, 64, 8);
 		card->cid.prod_name[5]	= UNSTUFF_BITS(resp, 56, 8);
+		card->cid.prv		= UNSTUFF_BITS(resp, 48, 8);
 		card->cid.serial	= UNSTUFF_BITS(resp, 16, 32);
 		card->cid.month		= UNSTUFF_BITS(resp, 12, 4);
 		card->cid.year		= UNSTUFF_BITS(resp, 8, 4) + 1997;
@@ -627,6 +628,7 @@ MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
+MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 		card->ext_csd.enhanced_area_offset);
@@ -645,6 +647,7 @@ static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_manfid.attr,
 	&dev_attr_name.attr,
 	&dev_attr_oemid.attr,
+	&dev_attr_prv.attr,
 	&dev_attr_serial.attr,
 	&dev_attr_enhanced_area_offset.attr,
 	&dev_attr_enhanced_area_size.attr,
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 61b2c30..f31725b 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -17,6 +17,7 @@
 struct mmc_cid {
 	unsigned int		manfid;
 	char			prod_name[8];
+	unsigned char		prv;
 	unsigned int		serial;
 	unsigned short		oemid;
 	unsigned short		year;
-- 
1.8.1.3