Commit 06c421ee authored Apr 02, 2009 by Kevin Hilman Committed by Linus Torvalds Apr 02, 2009

memory_accessor: new interface for reading/writing persistent memory



Add 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@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent bf6aede7

include/linux/memory.h

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -99,4 +99,15 @@ enum mem_add_context { BOOT, HOTPLUG };
	#define hotplug_memory_notifier(fn, pri) do { } while (0)		#define hotplug_memory_notifier(fn, pri) do { } while (0)
	#endif		#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_ */		#endif /* _LINUX_MEMORY_H_ */