snd_usb_playback_dev_ops 1820 sound/usb/pcm.c static const struct snd_pcm_ops snd_usb_playback_dev_ops = { snd_usb_playback_dev_ops 1853 sound/usb/pcm.c &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;