[PATCH v2 5/8] mmc: block: Add mmc_bdev_to_area_type() helper

[Dmitry Osipenko <digetx@gmail.com>]

NVIDIA Tegra Partition Table parser needs to know eMMC partition type
in order to validate and parse partition table properly. This patch adds
new mmc_bdev_to_area_type() helper which takes block device for the input
and returns a corresponding MMC card partition type.

This allows tegra-partition parser to distinguish boot eMMC partition from
the main eMMC partition.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/mmc/core/block.c   | 16 ++++++++++++++++
 include/linux/mmc/blkdev.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 2cee57c7388d..ec69b613ee92 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -337,6 +337,22 @@ int mmc_bdev_to_part_type(struct block_device *bdev)
 	return md->part_type;
 }
 
+int mmc_bdev_to_area_type(struct block_device *bdev)
+{
+	struct mmc_blk_data *md;
+	struct mmc_card *card;
+
+	card = mmc_bdev_to_card(bdev);
+	if (!card)
+		return -EINVAL;
+
+	md = mmc_blk_get(bdev->bd_disk);
+	if (!md)
+		return -EINVAL;
+
+	return md->area_type;
+}
+
 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 {
 	struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
diff --git a/include/linux/mmc/blkdev.h b/include/linux/mmc/blkdev.h
index 24e73ac02b4b..5fa5ef35ac25 100644
--- a/include/linux/mmc/blkdev.h
+++ b/include/linux/mmc/blkdev.h
@@ -10,5 +10,6 @@ struct mmc_card;
 
 struct mmc_card *mmc_bdev_to_card(struct block_device *bdev);
 int mmc_bdev_to_part_type(struct block_device *bdev);
+int mmc_bdev_to_area_type(struct block_device *bdev);
 
 #endif /* LINUX_MMC_BLOCK_DEVICE_H */
-- 
2.25.1