snd_hwdep_info    132 include/uapi/sound/asound.h #define SNDRV_HWDEP_IOCTL_INFO		_IOR ('H', 0x01, struct snd_hwdep_info)
snd_hwdep_info    930 include/uapi/sound/asound.h #define SNDRV_CTL_IOCTL_HWDEP_INFO	_IOR('U', 0x21, struct snd_hwdep_info)