linux-kernel - [PATCH v3 1/3] memory_accessor: new interface for reading/writing persistent memory

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Date:	Mon, 16 Mar 2009 14:36:17 -0700
From:	Kevin Hilman <khilman@...prootsystems.com>
To:	linux-kernel@...r.kernel.org
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Kevin Hilman <khilman@...prootsystems.com>
Subject: [PATCH v3 1/3] memory_accessor: new interface for reading/writing persistent memory

This patch adds an interface by which other kernel code can read/write
persistent memory such as I2C or SPI EEPROMs, or devices which provide
NVRAM.  Use cases include storage of board-specific configuration data
like Ethernet addresses and sensor calibrations.

Original idea, review and improvement suggestions by David Brownell.

Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@...prootsystems.com>
---
 include/linux/memory.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/linux/memory.h b/include/linux/memory.h
index 3fdc108..42767d1 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -99,4 +99,15 @@ enum mem_add_context { BOOT, HOTPLUG };
 #define hotplug_memory_notifier(fn, pri) do { } while (0)
 #endif
 
+/*
+ * 'struct memory_accessor' is a generic interface to provide
+ * in-kernel access to persistent memory such as i2c or SPI EEPROMs
+ */
+struct memory_accessor {
+	ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
+			size_t count);
+	ssize_t (*write)(struct memory_accessor *, const char *buf,
+			 off_t offset, size_t count);
+};
+
 #endif /* _LINUX_MEMORY_H_ */
-- 
1.6.1.3

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