linux-kernel - [PATCH 11/23] mtd: add mtd_eccpos(), mtd_oobfree() and mtd

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Date:	Mon,  7 Dec 2015 23:26:06 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org
Cc:	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	Josh Wu <josh.wu@...el.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Stefan Agner <stefan@...er.ch>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	punnaiah choudary kalluri <punnaia@...inx.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH 11/23] mtd: add mtd_eccpos(), mtd_oobfree() and mtd_eccbytes() helper functions

In order to make the ecclayout definition completely dynamic we need to
rework the way these different ECC layouts are defined and iterated.

Create the mtd_eccpos(), mtd_oobfree() and mtd_eccbytes() helpers to hide
ecclayout definition internals to their users.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
 include/linux/mtd/mtd.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 9cf13c4..25e3d0f 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -253,6 +253,38 @@ struct mtd_info {
 	int usecount;
 };
 
+static inline int mtd_eccpos(struct mtd_info *mtd, int eccbyte)
+{
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	if (eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	return mtd->ecclayout->eccpos[eccbyte];
+}
+
+static inline int mtd_oobfree(struct mtd_info *mtd, int section,
+			      struct nand_oobfree *oobfree)
+{
+	memset(oobfree, 0, sizeof(*oobfree));
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
+		return -ERANGE;
+
+	*oobfree = mtd->ecclayout->oobfree[section];
+
+	return 0;
+}
+
+static inline int mtd_eccbytes(struct mtd_info *mtd)
+{
+	return mtd->ecclayout ? mtd->ecclayout->eccbytes : 0;
+}
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.1.4

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