SNDRV_PCM_IOCTL_PREPARE 590 include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_PREPARE _IO('A', 0x40) SNDRV_PCM_IOCTL_PREPARE 590 tools/include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_PREPARE _IO('A', 0x40)