SNDRV_PCM_IOCTL_LINK  604 include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_LINK		_IOW('A', 0x60, int)
SNDRV_PCM_IOCTL_LINK  604 tools/include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_LINK		_IOW('A', 0x60, int)