[PATCH 09/10] mtd: nand: Add bbt parameter

[Sascha Hauer]

The information which kind of bbt (if any) is used is hidden somewhere
in the NAND layer. Expose it to a device parameter to make it detectable
and visible during runtime.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/mtd/nand/nand_base.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index ac223ca..7675695 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1688,6 +1688,23 @@ static int mtd_set_erasebad(struct device_d *dev, struct param_d *param,
 	return 0;
 }
 
+static const char *mtd_get_bbt_type(struct device_d *dev, struct param_d *p)
+{
+	struct mtd_info *mtd = container_of(dev, struct mtd_info, class_dev);
+	struct nand_chip *chip = mtd->priv;
+	char *str;
+
+	if (!chip->bbt)
+		str = "none";
+	else if ((chip->bbt_td && chip->bbt_td->pages[0] != -1) ||
+				(chip->bbt_md && chip->bbt_md->pages[0] != -1))
+		str = "flashbased";
+	else
+		str = "memorybased";
+
+	return str;
+}
+
 int add_mtd_nand_device(struct mtd_info *mtd, char *devname)
 {
 	int ret;
@@ -1700,6 +1717,8 @@ int add_mtd_nand_device(struct mtd_info *mtd, char *devname)
 		dev_add_param(&mtd->class_dev, "erasebad", mtd_set_erasebad,
 				NULL, 0);
 
+	dev_add_param(&mtd->class_dev, "bbt", NULL, mtd_get_bbt_type, 0);
+
 	return ret;
 }
 
-- 
1.7.10.4