u_audio_playback  317 drivers/usb/gadget/function/f_uac1_legacy.c 	u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
u_audio_playback   75 drivers/usb/gadget/function/u_uac1_legacy.h size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);