cdrom.h

基于组件方式开发操作系统的OSKIT源代码

/*
 * -- <linux/cdrom.h>
 * General header file for linux CD-ROM drivers 
 * Copyright (C) 1992         David Giller, [e-mail]
 *               1994, 1995   Eberhard Moenkeberg, [e-mail]
 *               1996         David van Leeuwen, [e-mail]
 *               1997, 1998   Erik Andersen, [e-mail]
 *               1998, 1999   Jens Axboe, [e-mail]
 */
 
#ifndef	_LINUX_CDROM_H
#define	_LINUX_CDROM_H

/*******************************************************
 * As of Linux 2.1.x, all Linux CD-ROM application programs will use this 
 * (and only this) include file.  It is my hope to provide Linux with
 * a uniform interface between software accessing CD-ROMs and the various 
 * device drivers that actually talk to the drives.  There may still be
 * 23 different kinds of strange CD-ROM drives, but at least there will 
 * now be one, and only one, Linux CD-ROM interface.
 *
 * Additionally, as of Linux 2.1.x, all Linux application programs 
 * should use the O_NONBLOCK option when opening a CD-ROM device 
 * for subsequent ioctl commands.  This allows for neat system errors 
 * like "No medium found" or "Wrong medium type" upon attempting to 
 * mount or play an empty slot, mount an audio disc, or play a data disc.
 * Generally, changing an application program to support O_NONBLOCK
 * is as easy as the following:
 *       -    drive = open("/dev/cdrom", O_RDONLY);
 *       +    drive = open("/dev/cdrom", O_RDONLY | O_NONBLOCK);
 * It is worth the small change.
 *
 *  Patches for many common CD programs (provided by David A. van Leeuwen)
 *  can be found at:  ftp://ftp.gwdg.de/pub/linux/cdrom/drivers/cm206/
 * 
 *******************************************************/

/* When a driver supports a certain function, but the cdrom drive we are 
 * using doesn't, we will return the error EDRIVE_CANT_DO_THIS.  We will 
 * borrow the "Operation not supported" error from the network folks to 
 * accomplish this.  Maybe someday we will get a more targeted error code, 
 * but this will do for now... */
#define EDRIVE_CANT_DO_THIS  EOPNOTSUPP

/*******************************************************
 * The CD-ROM IOCTL commands  -- these should be supported by 
 * all the various cdrom drivers.  For the CD-ROM ioctls, we 
 * will commandeer byte 0x53, or 'S'.
 *******************************************************/
#define CDROMPAUSE		0x5301 /* Pause Audio Operation */ 
#define CDROMRESUME		0x5302 /* Resume paused Audio Operation */
#define CDROMPLAYMSF		0x5303 /* Play Audio MSF (struct cdrom_msf) */
#define CDROMPLAYTRKIND		0x5304 /* Play Audio Track/index 
                                           (struct cdrom_ti) */
#define CDROMREADTOCHDR		0x5305 /* Read TOC header 
                                           (struct cdrom_tochdr) */
#define CDROMREADTOCENTRY	0x5306 /* Read TOC entry 
                                           (struct cdrom_tocentry) */
#define CDROMSTOP		0x5307 /* Stop the cdrom drive */
#define CDROMSTART		0x5308 /* Start the cdrom drive */
#define CDROMEJECT		0x5309 /* Ejects the cdrom media */
#define CDROMVOLCTRL		0x530a /* Control output volume 
                                           (struct cdrom_volctrl) */
#define CDROMSUBCHNL		0x530b /* Read subchannel data 
                                           (struct cdrom_subchnl) */
#define CDROMREADMODE2		0x530c /* Read CDROM mode 2 data (2336 Bytes) 
                                           (struct cdrom_read) */
#define CDROMREADMODE1		0x530d /* Read CDROM mode 1 data (2048 Bytes)
                                           (struct cdrom_read) */
#define CDROMREADAUDIO		0x530e /* (struct cdrom_read_audio) */
#define CDROMEJECT_SW		0x530f /* enable(1)/disable(0) auto-ejecting */
#define CDROMMULTISESSION	0x5310 /* Obtain the start-of-last-session 
                                           address of multi session disks 
                                           (struct cdrom_multisession) */
#define CDROM_GET_MCN		0x5311 /* Obtain the "Universal Product Code" 
                                           if available (struct cdrom_mcn) */
#define CDROM_GET_UPC		CDROM_GET_MCN  /* This one is depricated, 
                                          but here anyway for compatability */
#define CDROMRESET		0x5312 /* hard-reset the drive */
#define CDROMVOLREAD		0x5313 /* Get the drive's volume setting 
                                          (struct cdrom_volctrl) */
#define CDROMREADRAW		0x5314	/* read data in raw mode (2352 Bytes)
                                           (struct cdrom_read) */
/* 
 * These ioctls are used only used in aztcd.c and optcd.c
 */
#define CDROMREADCOOKED		0x5315	/* read data in cooked mode */
#define CDROMSEEK		0x5316  /* seek msf address */
  
/*
 * This ioctl is only used by the scsi-cd driver.  
   It is for playing audio in logical block addressing mode.
 */
#define CDROMPLAYBLK		0x5317	/* (struct cdrom_blk) */

/* 
 * These ioctls are used only used in optcd.c
 */
#define CDROMREADALL		0x5318	/* read all 2646 bytes */
#define CDROMCLOSETRAY		0x5319	/* pendant of CDROMEJECT */

/* 
 * These ioctls are implemented through the uniform CD-ROM driver
 * They _will_ be adopted by all CD-ROM drivers, when all the CD-ROM
 * drivers are eventually ported to the uniform CD-ROM driver interface.
 */
#define CDROM_SET_OPTIONS	0x5320  /* Set behavior options */
#define CDROM_CLEAR_OPTIONS	0x5321  /* Clear behavior options */
#define CDROM_SELECT_SPEED	0x5322  /* Set the CD-ROM speed */
#define CDROM_SELECT_DISC	0x5323  /* Select disc (for juke-boxes) */
#define CDROM_MEDIA_CHANGED	0x5325  /* Check is media changed  */
#define CDROM_DRIVE_STATUS	0x5326  /* Get tray position, etc. */
#define CDROM_DISC_STATUS	0x5327  /* Get disc type, etc. */
#define CDROM_CHANGER_NSLOTS    0x5328  /* Get number of slots */
#define CDROM_LOCKDOOR		0x5329  /* lock or unlock door */
#define CDROM_DEBUG		0x5330	/* Turn debug messages on/off */
#define CDROM_GET_CAPABILITY	0x5331	/* get capabilities */

/* This ioctl is only used by sbpcd at the moment */
#define CDROMAUDIOBUFSIZ        0x5382	/* set the audio buffer size */

/*******************************************************
 * CDROM IOCTL structures
 *******************************************************/

/* Address in MSF format */
struct cdrom_msf0		
{
	u_char	minute;
	u_char	second;
	u_char	frame;
};

/* Address in either MSF or logical format */
union cdrom_addr		
{
	struct cdrom_msf0	msf;
	int			lba;
};

/* This struct is used by the CDROMPLAYMSF ioctl */ 
struct cdrom_msf 
{
	u_char	cdmsf_min0;	/* start minute */
	u_char	cdmsf_sec0;	/* start second */
	u_char	cdmsf_frame0;	/* start frame */
	u_char	cdmsf_min1;	/* end minute */
	u_char	cdmsf_sec1;	/* end second */
	u_char	cdmsf_frame1;	/* end frame */
};

/* This struct is used by the CDROMPLAYTRKIND ioctl */
struct cdrom_ti 
{
	u_char	cdti_trk0;	/* start track */
	u_char	cdti_ind0;	/* start index */
	u_char	cdti_trk1;	/* end track */
	u_char	cdti_ind1;	/* end index */
};

/* This struct is used by the CDROMREADTOCHDR ioctl */
struct cdrom_tochdr 	
{
	u_char	cdth_trk0;	/* start track */
	u_char	cdth_trk1;	/* end track */
};

/* This struct is used by the CDROMVOLCTRL and CDROMVOLREAD ioctls */
struct cdrom_volctrl
{
	u_char	channel0;
	u_char	channel1;
	u_char	channel2;
	u_char	channel3;
};

/* This struct is used by the CDROMSUBCHNL ioctl */
struct cdrom_subchnl 
{
	u_char	cdsc_format;
	u_char	cdsc_audiostatus;
	u_char	cdsc_adr:	4;
	u_char	cdsc_ctrl:	4;
	u_char	cdsc_trk;
	u_char	cdsc_ind;
	union cdrom_addr cdsc_absaddr;
	union cdrom_addr cdsc_reladdr;
};


/* This struct is used by the CDROMREADTOCENTRY ioctl */
struct cdrom_tocentry 
{
	u_char	cdte_track;
	u_char	cdte_adr	:4;
	u_char	cdte_ctrl	:4;
	u_char	cdte_format;
	union cdrom_addr cdte_addr;
	u_char	cdte_datamode;
};

/* This struct is used by the CDROMREADMODE1, and CDROMREADMODE2 ioctls */
struct cdrom_read      
{
	int	cdread_lba;
	caddr_t	cdread_bufaddr;
	int	cdread_buflen;
};

/* This struct is used by the CDROMREADAUDIO ioctl */
struct cdrom_read_audio
{
	union cdrom_addr addr; /* frame address */
	u_char addr_format;    /* CDROM_LBA or CDROM_MSF */
	int nframes;           /* number of 2352-byte-frames to read at once */
	u_char *buf;           /* frame buffer (size: nframes*2352 bytes) */
};