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firmware loader: introduce cache_firmware and uncache_firmware

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This patches introduce two kernel APIs of cache_firmware and
uncache_firmware, both of which take the firmware file name
as the only parameter.

So any drivers can call cache_firmware to cache the specified
firmware file into kernel memory, and can use the cached firmware
in situations which can't request firmware from user space.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2012-08-04 12:01:22 +08:00 • committed by Greg Kroah-Hartman
commit 2887b3959c
2 changed files with 104 additions and 8 deletions
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12
include/linux/firmware.h
View file

@ -47,6 +47,8 @@ int request_firmware_nowait(
void (*cont)(const struct firmware *fw, void *context));
void release_firmware(const struct firmware *fw);
int cache_firmware(const char *name);
int uncache_firmware(const char *name);
#else
static inline int request_firmware(const struct firmware **fw,
const char *name,
@ -65,6 +67,16 @@ static inline int request_firmware_nowait(
static inline void release_firmware(const struct firmware *fw)
{
}
static inline int cache_firmware(const char *name)
{
return -ENOENT;
}
static inline int uncache_firmware(const char *name)
{
return -EINVAL;
}
#endif
#endif