SNDRV_PCM_IOCTL_USER_PVERSION 579 include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_USER_PVERSION _IOW('A', 0x04, int) SNDRV_PCM_IOCTL_USER_PVERSION 579 tools/include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_USER_PVERSION _IOW('A', 0x04, int)