53ed8cf625
Current implementation of driver has several similar helper functions for packet format detection in protocol version 2. This commit merges them as code refactoring. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210623075941.72562-6-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>