original-kernel-headers/sound/voice_params.h

#ifndef __VOICE_PARAMS_H__
#define __VOICE_PARAMS_H__

#include <linux/types.h>
#include <sound/asound.h>

enum voice_lch_mode {
	VOICE_LCH_START = 1,
	VOICE_LCH_STOP
};

#define SNDRV_VOICE_IOCTL_LCH _IOW('U', 0x00, enum voice_lch_mode)

#endif