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| author | Kevin Hilman <khilman@deeprootsystems.com> | 2009-04-02 16:56:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-02 19:04:50 -0700 |
| commit | 06c421ee0d5af95c8c6749ca0ba620cd5010707f (patch) | |
| tree | e4b2cd412d7dd3081f8aaee88d77b1ab72b33b15 | |
| parent | bf6aede712334d7338d5c47a5ee5ba3883c82a61 (diff) | |
| download | linux-06c421ee0d5af95c8c6749ca0ba620cd5010707f.tar.gz | |
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>
| -rw-r--r-- | 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 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_ */ |