ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

firmware_loader: formalize built-in firmware API

Browse Source 
Formalize the built-in firmware with a proper API. This can later
be used by other callers where all they need is built-in firmware.

We export the firmware_request_builtin() call for now only
under the TEST_FIRMWARE symbol namespace as there are no
direct modular users for it. If they pop up they are free
to export it generally. Built-in code always gets access to
the callers and we'll demonstrate a hidden user which has been
lurking in the kernel for a while and the reason why using a
proper API was better long term.

Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20211021155843.1969401-2-mcgrof@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luis Chamberlain
2021-10-21 08:58:34 -07:00
committed by Greg Kroah-Hartman
parent c87761db21
commit 48d09e9787
5 changed files with 137 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/firmware.h
View File

@@ -20,12 +20,19 @@ struct firmware {
struct module;
struct device;
/*
* Built-in firmware functionality is only available if FW_LOADER=y, but not
* FW_LOADER=m
*/
#ifdef CONFIG_FW_LOADER
struct builtin_fw {
char *name;
void *data;
unsigned long size;
};
bool firmware_request_builtin(struct firmware *fw, const char *name);
/* We have to play tricks here much like stringify() to get the
__COUNTER__ macro to be expanded as we want it */
#define __fw_concat1(x, y) x##y
@@ -38,6 +45,14 @@ struct builtin_fw {
static const struct builtin_fw __fw_concat(__builtin_fw,__COUNTER__) \
__used __section(".builtin_fw") = { name, blob, size }
#else
static inline bool firmware_request_builtin(struct firmware *fw,
const char *name)
{
return false;
}
#endif
#if defined(CONFIG_FW_LOADER) || (defined(CONFIG_FW_LOADER_MODULE) && defined(MODULE))
int request_firmware(const struct firmware **fw, const char *name,
struct device *device);