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authorKevin Hilman <khilman@deeprootsystems.com>2009-04-03 03:56:56 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-03 06:04:50 +0400
commit06c421ee0d5af95c8c6749ca0ba620cd5010707f (patch)
treee4b2cd412d7dd3081f8aaee88d77b1ab72b33b15 /include
parentbf6aede712334d7338d5c47a5ee5ba3883c82a61 (diff)
downloadlinux-06c421ee0d5af95c8c6749ca0ba620cd5010707f.tar.xz
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/memory.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 3fdc10806d31..42767d1a62e7 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_ */