audioio.h

/*
 * include/asm-sparc/audioio.h
 *
 * Sparc Audio Midlayer
 * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
 */

#ifndef _AUDIOIO_H_
#define _AUDIOIO_H_

/*
 *	SunOS/Solaris /dev/audio interface
 */

#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
#include <linux/types.h>
#include <linux/time.h>
#include <linux/ioctl.h>
#endif

/*
 * This structure contains state information for audio device IO streams.
 */
typedef struct audio_prinfo {
	/*
	 * The following values describe the audio data encoding.
	 */
	unsigned int sample_rate;	/* samples per second */
	unsigned int channels;	/* number of interleaved channels */
	unsigned int precision;	/* bit-width of each sample */
	unsigned int encoding;	/* data encoding method */

	/*
	 * The following values control audio device configuration
	 */
	unsigned int gain;		/* gain level: 0 - 255 */
	unsigned int port;		/* selected I/O port (see below) */
	unsigned int avail_ports;	/* available I/O ports (see below) */
	unsigned int _xxx[2];		/* Reserved for future use */

	unsigned int buffer_size;	/* I/O buffer size */

	/*
	 * The following values describe driver state
	 */
	unsigned int samples;		/* number of samples converted */
	unsigned int eof;		/* End Of File counter (play only) */

	unsigned char	pause;		/* non-zero for pause, zero to resume */
	unsigned char	error;		/* non-zero if overflow/underflow */
	unsigned char	waiting;	/* non-zero if a process wants access */
	unsigned char balance;	/* stereo channel balance */

	unsigned short minordev;

	/*
	 * The following values are read-only state flags
	 */
	unsigned char open;		/* non-zero if open access permitted */
	unsigned char active;		/* non-zero if I/O is active */
} audio_prinfo_t;


/*
 * This structure describes the current state of the audio device.
 */
typedef struct audio_info {
	/*
	 * Per-stream information
	 */
	audio_prinfo_t play;	/* output status information */
	audio_prinfo_t record;	/* input status information */

	/*
	 * Per-unit/channel information
	 */
	unsigned int monitor_gain;	/* input to output mix: 0 - 255 */
	unsigned char output_muted;	/* non-zero if output is muted */
	unsigned char _xxx[3];	/* Reserved for future use */
	unsigned int _yyy[3];		/* Reserved for future use */
} audio_info_t;


/*
 * Audio encoding types
 */
#define	AUDIO_ENCODING_NONE	(0)	/* no encoding assigned	  */
#define	AUDIO_ENCODING_ULAW	(1)	/* u-law encoding	  */
#define	AUDIO_ENCODING_ALAW	(2)	/* A-law encoding	  */
#define	AUDIO_ENCODING_LINEAR	(3)	/* Linear PCM encoding	  */
#define AUDIO_ENCODING_FLOAT    (4)     /* IEEE float (-1. <-> +1.) */
#define	AUDIO_ENCODING_DVI	(104)	/* DVI ADPCM		  */
#define	AUDIO_ENCODING_LINEAR8	(105)	/* 8 bit UNSIGNED	  */
#define	AUDIO_ENCODING_LINEARLE	(106)	/* Linear PCM LE encoding */

/*
 * These ranges apply to record, play, and monitor gain values
 */
#define	AUDIO_MIN_GAIN	(0)	/* minimum gain value */
#define	AUDIO_MAX_GAIN	(255)	/* maximum gain value */

/*
 * These values apply to the balance field to adjust channel gain values
 */
#define	AUDIO_LEFT_BALANCE	(0)	/* left channel only	*/
#define	AUDIO_MID_BALANCE	(32)	/* equal left/right channel */
#define	AUDIO_RIGHT_BALANCE	(64)	/* right channel only	*/
#define	AUDIO_BALANCE_SHIFT	(3)

/*
 * Generic minimum/maximum limits for number of channels, both modes
 */
#define	AUDIO_MIN_PLAY_CHANNELS	(1)
#define	AUDIO_MAX_PLAY_CHANNELS	(4)
#define	AUDIO_MIN_REC_CHANNELS	(1)
#define	AUDIO_MAX_REC_CHANNELS	(4)

/*
 * Generic minimum/maximum limits for sample precision
 */
#define	AUDIO_MIN_PLAY_PRECISION	(8)
#define	AUDIO_MAX_PLAY_PRECISION	(32)
#define	AUDIO_MIN_REC_PRECISION		(8)
#define	AUDIO_MAX_REC_PRECISION		(32)

/*
 * Define some convenient names for typical audio ports
 */
/*
 * output ports (several may be enabled simultaneously)
 */
#define	AUDIO_SPEAKER		0x01	/* output to built-in speaker */
#define	AUDIO_HEADPHONE		0x02	/* output to headphone jack */
#define	AUDIO_LINE_OUT		0x04	/* output to line out	 */

/*
 * input ports (usually only one at a time)
 */
#define	AUDIO_MICROPHONE	0x01	/* input from microphone */
#define	AUDIO_LINE_IN		0x02	/* input from line in	 */
#define	AUDIO_CD		0x04	/* input from on-board CD inputs */
#define	AUDIO_INTERNAL_CD_IN	AUDIO_CD	/* input from internal CDROM */
#define AUDIO_ANALOG_LOOPBACK   0x40    /* input from output */


/*
 * This macro initializes an audio_info structure to 'harmless' values.
 * Note that (~0) might not be a harmless value for a flag that was
 * a signed int.
 */
#define	AUDIO_INITINFO(i)	{					\
	unsigned int	*__x__;						\
	for (__x__ = (unsigned int *)(i);				\
	    (char *) __x__ < (((char *)(i)) + sizeof (audio_info_t));	\
	    *__x__++ = ~0);						\
}

/*
 * These allow testing for what the user wants to set 
 */
#define AUD_INITVALUE   (~0)
#define Modify(X)       ((unsigned int)(X) != AUD_INITVALUE)
#define Modifys(X)      ((X) != (unsigned short)AUD_INITVALUE)
#define Modifyc(X)      ((X) != (unsigned char)AUD_INITVALUE)

/*
 * Parameter for the AUDIO_GETDEV ioctl to determine current
 * audio devices.
 */
#define	MAX_AUDIO_DEV_LEN	(16)
typedef struct audio_device {
	char name[MAX_AUDIO_DEV_LEN];
	char version[MAX_AUDIO_DEV_LEN];
	char config[MAX_AUDIO_DEV_LEN];
} audio_device_t;


/*
 * Ioctl calls for the audio device.
 */

/*
 * AUDIO_GETINFO retrieves the current state of the audio device.
 *
 * AUDIO_SETINFO copies all fields of the audio_info structure whose
 * values are not set to the initialized value (-1) to the device state.
 * It performs an implicit AUDIO_GETINFO to return the new state of the
 * device.  Note that the record.samples and play.samples fields are set
 * to the last value before the AUDIO_SETINFO took effect.  This allows
 * an application to reset the counters while atomically retrieving the
 * last value.
 *
 * AUDIO_DRAIN suspends the calling process until the write buffers are
 * empty.
 *
 * AUDIO_GETDEV returns a structure of type audio_device_t which contains
 * three strings.  The string "name" is a short identifying string (for
 * example, the SBus Fcode name string), the string "version" identifies
 * the current version of the device, and the "config" string identifies
 * the specific configuration of the audio stream.  All fields are
 * device-dependent -- see the device specific manual pages for details.
 *
 * AUDIO_GETDEV_SUNOS returns a number which is an audio device defined 
 * herein (making it not too portable)
 *
 * AUDIO_FLUSH stops all playback and recording, clears all queued buffers, 
 * resets error counters, and restarts recording and playback as appropriate
 * for the current sampling mode.
 */
#define	AUDIO_GETINFO	_IOR('A', 1, audio_info_t)
#define	AUDIO_SETINFO	_IOWR('A', 2, audio_info_t)
#define	AUDIO_DRAIN	_IO('A', 3)
#define	AUDIO_GETDEV	_IOR('A', 4, audio_device_t)
#define	AUDIO_GETDEV_SUNOS	_IOR('A', 4, int)
#define AUDIO_FLUSH     _IO('A', 5)

/* Define possible audio hardware configurations for 
 * old SunOS-style AUDIO_GETDEV ioctl */
#define AUDIO_DEV_UNKNOWN       (0)     /* not defined */
#define AUDIO_DEV_AMD           (1)     /* audioamd device */
#define AUDIO_DEV_SPEAKERBOX    (2)     /* dbri device with speakerbox */
#define AUDIO_DEV_CODEC         (3)     /* dbri device (internal speaker) */
#define AUDIO_DEV_CS4231        (5)     /* cs4231 device */

/*
 * The following ioctl sets the audio device into an internal loopback mode,
 * if the hardware supports this.  The argument is TRUE to set loopback,
 * FALSE to reset to normal operation.  If the hardware does not support
 * internal loopback, the ioctl should fail with EINVAL.
 * Causes ADC data to be digitally mixed in and sent to the DAC.
 */
#define	AUDIO_DIAG_LOOPBACK	_IOW('A', 101, int)

#endif /* _AUDIOIO_H_ */