.Dd January 16, 1996 .Dt CD 4 .Os FreeBSD .Sh NAME .Nm cd .Nd SCSI CD-ROM driver .Sh SYNOPSIS .Cd device cd .Cd device cd1 at scbus0 target 4 lun 0 .Sh DESCRIPTION The .Nm cd driver provides support for a .Tn SCSI .Tn CD-ROM (Compact Disc-Read Only Memory) drive. In an attempt to look like a regular disk, the .Nm driver synthesizes a partition table, with one partition covering the entire .Tn CD-ROM . It is possible to modify this partition table using .Xr disklabel 8 , but it will only last until the .Tn CD-ROM is unmounted. In general the interfaces are similar to those described by .Xr wd 4 and .Xr sd 4 . .Pp As the .Tn SCSI adapter is probed during boot, the .Tn SCSI bus is scanned for devices. Any devices found which answer as `Read-only' type devices will be `attached' to the .Nm driver. In FreeBSD releases prior to 2.1, the first found will be attached as .Li cd0 the next, .Li cd1 , etc. Beginning in 2.1 it is possible to specify what cd unit a device should come on line as; refer to .Xr scsi 4 for details on kernel configuration. .Pp The system utility .Xr disklabel 8 may be used to read the synthesized disk label structure, which will contain correct figures for the size of the .Tn CD-ROM should that information be required. .Pp .Sh KERNEL CONFIGURATION Any number of .Tn CD-ROM devices may be attached to the system regardless of system configuration as all resources are dynamically allocated. .Sh IOCTLS The following .Xr ioctl 2 calls which apply to .Tn SCSI .Tn CD-ROM drives are defined in the header files .Aq Pa sys/cdio.h and .Aq Pa sys/disklabel.h . .Pp .Bl -tag -width CDIOCREADSUBCHANNEL -compact .It Dv DIOCGDINFO .It Dv DIOCSDINFO .Pq Li "struct disklabel" Read or write the in-core copy of the disklabel for the drive. The disklabel is initialized with information read from the scsi inquiry commands, and should be the same as the information printed at boot. This structure is defined in .Xr disklabel 5 . .It Dv CDIOCCAPABILITY .Pq Li "struct ioc_capability" Retrieve information from the drive on what features it supports. The information is returned in the following structure: .Bd -literal -offset indent struct ioc_capability { u_long play_function; #define CDDOPLAYTRK 0x00000001 /* Can play tracks/index */ #define CDDOPLAYMSF 0x00000002 /* Can play msf to msf */ #define CDDOPLAYBLOCKS 0x00000004 /* Can play range of blocks */ #define CDDOPAUSE 0x00000100 /* Output can be paused */ #define CDDORESUME 0x00000200 /* Output can be resumed */ #define CDDORESET 0x00000400 /* Drive can be completely reset */ #define CDDOSTART 0x00000800 /* Audio can be started */ #define CDDOSTOP 0x00001000 /* Audio can be stopped */ #define CDDOPITCH 0x00002000 /* Audio pitch can be changed */ u_long routing_function; #define CDREADVOLUME 0x00000001 /* Volume settings can be read */ #define CDSETVOLUME 0x00000002 /* Volume settings can be set */ #define CDSETMONO 0x00000100 /* Output can be set to mono */ #define CDSETSTEREO 0x00000200 /* Output can be set to stereo (def) */ #define CDSETLEFT 0x00000400 /* Output can be set to left only */ #define CDSETRIGHT 0x00000800 /* Output can be set to right only */ #define CDSETMUTE 0x00001000 /* Output can be muted */ #define CDSETPATCH 0x00008000 /* Direct routing control allowed */ u_long special_function; #define CDDOEJECT 0x00000001 /* The tray can be opened */ #define CDDOCLOSE 0x00000002 /* The tray can be closed */ #define CDDOLOCK 0x00000004 /* The tray can be locked */ #define CDREADHEADER 0x00000100 /* Can read Table of Contents */ #define CDREADENTRIES 0x00000200 /* Can read TOC Entries */ #define CDREADSUBQ 0x00000200 /* Can read Subchannel info */ #define CDREADRW 0x00000400 /* Can read subcodes R-W */ #define CDHASDEBUG 0x00004000 /* The tray has dynamic debugging */ }; .Ed .It Dv CDIOCPLAYTRACKS .Pq Li "struct ioc_play_track" Start audio playback given a track address and length. The structure is defined as follows: .Bd -literal -offset indent struct ioc_play_track { u_char start_track; u_char start_index; u_char end_track; u_char end_index; }; .Ed .It Dv CDIOCPLAYBLOCKS .Pq Li "struct ioc_play_blocks" Start audio playback given a block address and length. The structure is defined as follows: .Bd -literal -offset indent struct ioc_play_blocks { int blk; int len; }; .Ed .It Dv CDIOCPLAYMSF .Pq Li "struct ioc_play_msf" Start audio playback given a `minutes-seconds-frames' address and length. The structure is defined as follows: .Bd -literal -offset indent struct ioc_play_msf { u_char start_m; u_char start_s; u_char start_f; u_char end_m; u_char end_s; u_char end_f; }; .Ed .It Dv CDIOCREADSUBCHANNEL .Pq Li "struct ioc_read_subchannel" Read information from the subchannel at the location specified by this structure: .Bd -literal -offset indent struct ioc_read_subchannel { u_char address_format; #define CD_LBA_FORMAT 1 #define CD_MSF_FORMAT 2 u_char data_format; #define CD_SUBQ_DATA 0 #define CD_CURRENT_POSITION 1 #define CD_MEDIA_CATALOG 2 #define CD_TRACK_INFO 3 u_char track; int data_len; struct cd_sub_channel_info *data; }; .Ed .It Dv CDIOREADTOCHEADER .Pq Li "struct ioc_toc_header" Return summary information about the table of contents for the mounted .Tn CD-ROM . The information is returned into the following structure: .Bd -literal -offset indent struct ioc_toc_header { u_short len; u_char starting_track; u_char ending_track; }; .Ed .It Dv CDIOREADTOCENTRYS .Pq Li "struct ioc_read_toc_entry" Return information from the table of contents entries mentioned. (Yes, this command name is misspelled.) The argument structure is defined as follows: .Bd -literal -offset indent struct ioc_read_toc_entry { u_char address_format; u_char starting_track; u_short data_len; struct cd_toc_entry *data; }; .Ed The requested data is written into an area of size .Li data_len and pointed to by .Li data . .It Dv CDIOCSETPATCH .Pq Li "struct ioc_patch" Attach various audio channels to various output channels. The argument structure is defined thusly: .Bd -literal -offset indent struct ioc_patch { u_char patch[4]; /* one for each channel */ }; .Ed .It Dv CDIOCGETVOL .It Dv CDIOCSETVOL .Pq Li "struct ioc_vol" Get (set) information about the volume settings of the output channels. The argument structure is as follows: .Bd -literal -offset indent struct ioc_vol { u_char vol[4]; /* one for each channel */ }; .Ed .It Dv CDIOCSETMONO Patch all output channels to all source channels. .It Dv CDIOCSETSTEREO Patch left source channel to the left output channel and the right source channel to the right output channel. .It Dv CDIOCSETMUTE Mute output without changing the volume settings. .It Dv CDIOCSETLEFT .It Dv CDIOCSETRIGHT Attach both output channels to the left (right) source channel. .It Dv CDIOCSETDEBUG .It Dv CDIOCCLRDEBUG Turn on (off) debugging for the appropriate device. .It Dv CDIOCPAUSE .It Dv CDIOCRESUME Pause (resume) audio play, without resetting the location of the read-head. .It Dv CDIOCRESET Reset the drive. .It Dv CDIOCSTART .It Dv CDIOCSTOP Tell the drive to spin-up (-down) the .Tn CD-ROM . .It Dv CDIOCALLOW .It Dv CDIOCPREVENT Tell the drive to allow (prevent) manual ejection of the .Tn CD-ROM disc. Not all drives support this feature. .It Dv CDIOCEJECT Eject the .Tn CD-ROM . .It Dv CDIOCCLOSE Tell the drive to close its door and load the media. Not all drives support this feature. .It Dv CDIOCPITCH .Pq Li "struct ioc_pitch" For drives that support it, this command instructs the drive to play the audio at a faster or slower rate than normal. Values of .Li speed between -32767 and -1 result in slower playback; a zero value indicates normal speed; and values from 1 to 32767 give faster playback. Drives with less than 16 bits of resolution will silently ignore less-significant bits. The structure is defined thusly: .Bd -literal -offset indent struct ioc_pitch { short speed; }; .Ed .El .Pp In addition the general .Xr scsi 4 ioctls may be used with the .Nm driver, if used against the `whole disk' partition (i.e. .Pa /dev/rcd0c ) . .Sh NOTES When a .Tn CD-ROM is changed in a drive controlled by the .Nm driver, then the act of changing the media will invalidate the disklabel and information held within the kernel. To stop corruption, all accesses to the device will be discarded until there are no more open file descriptors referencing the device. During this period, all new open attempts will be rejected. When no more open file descriptors reference the device, the first next open will load a new set of parameters (including disklabel) for the drive. .Pp The audio code in the .Nm driver only support .Tn SCSI-2 standard audio commands. Because many .Tn CD-ROM manufacturers have not followed the standard, there are many .Tn CD-ROM drives for which audio will not work. Some work is planned to support some of the more common `broken' .Tn CD-ROM drives; however, this is not yet under way. .Sh FILES .Bl -tag -width /dev/rcd[0-9][a-h] -compact .It Pa /dev/cd[0-9][a-h] block mode .Tn CD-ROM devices .It Pa /dev/rcd[0-9][a-h] raw mode .Tn CD-ROM devices .El .Sh DIAGNOSTICS None. .Sh SEE ALSO .Xr disklabel 1 , .Xr scsi 4 , .Xr sd 4 , .Xr disklabel 5 .Sh BUGS The names of the structures used for the third argument to .Fn ioctl were poorly chosen, and a number of spelling errors have survived in the names of the .Fn ioctl commands. .Sh HISTORY This .Nm driver appeared in 386BSD 0.1.