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memory_accessor: new interface for reading/writing persistent memory

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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>
This commit is contained in:
Kevin Hilman 2009-04-02 16:56:56 -07:00 committed by Linus Torvalds
parent bf6aede712
commit 06c421ee0d
1 changed files with 11 additions and 0 deletions
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11
include/linux/memory.h
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@ -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_ */