snd_ctl_tlv 843 include/sound/asound.h struct snd_ctl_tlv { snd_ctl_tlv 862 include/sound/asound.h SNDRV_CTL_IOCTL_TLV_READ = _IOWR('U', 0x1a, struct snd_ctl_tlv), snd_ctl_tlv 863 include/sound/asound.h SNDRV_CTL_IOCTL_TLV_WRITE = _IOWR('U', 0x1b, struct snd_ctl_tlv), snd_ctl_tlv 864 include/sound/asound.h SNDRV_CTL_IOCTL_TLV_COMMAND = _IOWR('U', 0x1c, struct snd_ctl_tlv),