1996-10-18 20:22:31 +00:00
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.\" Copyright (c) 1996
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.\" Julian Elischer <julian@freebsd.org>. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1996-12-26 16:16:37 +00:00
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.\"
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1998-10-12 03:27:51 +00:00
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.Dd October 10, 1998
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1995-01-25 09:18:56 +00:00
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.Dt CD 4
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.Os FreeBSD
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.Sh NAME
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.Nm cd
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1996-01-16 21:29:43 +00:00
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.Nd SCSI CD-ROM driver
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1995-01-25 09:18:56 +00:00
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.Sh SYNOPSIS
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1996-01-16 21:29:43 +00:00
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.Cd device cd
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1999-05-08 21:28:18 +00:00
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.Cd device cd1 at scbus0 target 4 unit 0
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1998-10-12 03:27:51 +00:00
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.Cd options "CHANGER_MIN_BUSY_SECONDS=3"
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.Cd options "CHANGER_MAX_BUSY_SECONDS=11"
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1995-01-25 09:18:56 +00:00
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.Sh DESCRIPTION
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The
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1996-01-16 21:29:43 +00:00
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.Nm cd
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1995-01-25 09:18:56 +00:00
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driver provides support for a
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1996-01-16 21:29:43 +00:00
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.Tn SCSI
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.Tn CD-ROM
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(Compact Disc-Read Only Memory) drive.
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In an attempt to look like a regular disk, the
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1995-01-25 09:18:56 +00:00
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.Nm
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1996-01-30 13:52:50 +00:00
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driver synthesizes a partition table, with one partition covering the entire
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1996-01-16 21:29:43 +00:00
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.Tn CD-ROM .
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It is possible to modify this partition table using
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.Xr disklabel 8 ,
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but it will only last until the
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.Tn CD-ROM
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is unmounted.
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1995-01-25 09:18:56 +00:00
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In general the interfaces are similar to those described by
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.Xr wd 4
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1996-01-16 21:29:43 +00:00
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and
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1998-10-12 03:27:51 +00:00
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.Xr da 4 .
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1995-01-25 09:18:56 +00:00
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.Pp
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1996-01-16 21:29:43 +00:00
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As the
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.Tn SCSI
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adapter is probed during boot, the
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.Tn SCSI
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2000-03-01 14:50:24 +00:00
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bus is scanned for devices.
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Any devices found which answer as CDROM
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1998-10-12 03:27:51 +00:00
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(type 5) or WORM (type 4) type devices will be `attached' to the
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1995-01-25 09:18:56 +00:00
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.Nm
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1995-03-01 22:32:38 +00:00
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driver.
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1997-03-21 20:14:15 +00:00
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Prior to
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.Fx 2.1 ,
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the first device found will be attached as
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1996-01-16 21:29:43 +00:00
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.Li cd0
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the next,
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.Li cd1 ,
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1995-01-25 09:18:56 +00:00
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etc.
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1997-03-21 20:14:15 +00:00
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Beginning in
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.Fx 2.1
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it is possible to specify what cd unit a device should
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1995-03-01 22:32:38 +00:00
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come on line as; refer to
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.Xr scsi 4
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for details on kernel configuration.
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1995-01-25 09:18:56 +00:00
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.Pp
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The system utility
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1996-01-16 21:29:43 +00:00
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.Xr disklabel 8
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1995-01-25 09:18:56 +00:00
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may be used to read the synthesized
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1996-01-16 21:29:43 +00:00
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disk label
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structure, which will contain correct figures for the size of the
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.Tn CD-ROM
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1995-01-25 09:18:56 +00:00
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should that information be required.
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.Pp
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.Sh KERNEL CONFIGURATION
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1996-01-16 21:29:43 +00:00
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Any number of
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.Tn CD-ROM
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devices may be attached to the system regardless of system
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1995-01-25 09:18:56 +00:00
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configuration as all resources are dynamically allocated.
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.Sh IOCTLS
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The following
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.Xr ioctl 2
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1996-01-16 21:29:43 +00:00
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calls which apply to
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.Tn SCSI
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.Tn CD-ROM
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drives are defined
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1995-01-25 09:18:56 +00:00
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in the header files
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1996-01-16 21:29:43 +00:00
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.Aq Pa sys/cdio.h
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1995-01-25 09:18:56 +00:00
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and
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1996-01-16 21:29:43 +00:00
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.Aq Pa sys/disklabel.h .
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.Pp
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.Bl -tag -width CDIOCREADSUBCHANNEL -compact
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1995-01-25 09:18:56 +00:00
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.It Dv DIOCGDINFO
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.It Dv DIOCSDINFO
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1996-01-16 21:29:43 +00:00
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.Pq Li "struct disklabel"
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Read or write the in-core copy of the disklabel for the
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drive. The disklabel is initialized with information
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read from the scsi inquiry commands, and should be the same as
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the information printed at boot. This structure is defined in
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.Xr disklabel 5 .
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.It Dv CDIOCCAPABILITY
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.Pq Li "struct ioc_capability"
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Retrieve information from the drive on what features it supports. The
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information is returned in the following structure:
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.Bd -literal -offset indent
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struct ioc_capability {
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u_long play_function;
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#define CDDOPLAYTRK 0x00000001
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/* Can play tracks/index */
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#define CDDOPLAYMSF 0x00000002
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/* Can play msf to msf */
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#define CDDOPLAYBLOCKS 0x00000004
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/* Can play range of blocks */
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#define CDDOPAUSE 0x00000100
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/* Output can be paused */
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#define CDDORESUME 0x00000200
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/* Output can be resumed */
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#define CDDORESET 0x00000400
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/* Drive can be completely reset */
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#define CDDOSTART 0x00000800
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/* Audio can be started */
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#define CDDOSTOP 0x00001000
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/* Audio can be stopped */
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#define CDDOPITCH 0x00002000
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/* Audio pitch can be changed */
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u_long routing_function;
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#define CDREADVOLUME 0x00000001
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/* Volume settings can be read */
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#define CDSETVOLUME 0x00000002
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/* Volume settings can be set */
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#define CDSETMONO 0x00000100
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/* Output can be set to mono */
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#define CDSETSTEREO 0x00000200
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/* Output can be set to stereo (def) */
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#define CDSETLEFT 0x00000400
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/* Output can be set to left only */
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#define CDSETRIGHT 0x00000800
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/* Output can be set to right only */
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#define CDSETMUTE 0x00001000
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/* Output can be muted */
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#define CDSETPATCH 0x00008000
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1996-01-30 13:52:50 +00:00
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/* Direct routing control allowed */
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1996-01-16 21:29:43 +00:00
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u_long special_function;
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#define CDDOEJECT 0x00000001
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/* The tray can be opened */
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#define CDDOCLOSE 0x00000002
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/* The tray can be closed */
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#define CDDOLOCK 0x00000004
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/* The tray can be locked */
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#define CDREADHEADER 0x00000100
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/* Can read Table of Contents */
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#define CDREADENTRIES 0x00000200
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/* Can read TOC Entries */
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#define CDREADSUBQ 0x00000200
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/* Can read Subchannel info */
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#define CDREADRW 0x00000400
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/* Can read subcodes R-W */
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#define CDHASDEBUG 0x00004000
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/* The tray has dynamic debugging */
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};
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.Ed
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.It Dv CDIOCPLAYTRACKS
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.Pq Li "struct ioc_play_track"
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Start audio playback given a track address and length. The structure
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is defined as follows:
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.Bd -literal -offset indent
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struct ioc_play_track
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{
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u_char start_track;
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u_char start_index;
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u_char end_track;
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u_char end_index;
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};
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.Ed
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.It Dv CDIOCPLAYBLOCKS
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.Pq Li "struct ioc_play_blocks"
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Start audio playback given a block address and length. The structure
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is defined as follows:
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.Bd -literal -offset indent
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struct ioc_play_blocks
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{
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int blk;
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int len;
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};
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.Ed
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.It Dv CDIOCPLAYMSF
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.Pq Li "struct ioc_play_msf"
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Start audio playback given a `minutes-seconds-frames' address and
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length. The structure is defined as follows:
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.Bd -literal -offset indent
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struct ioc_play_msf
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{
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u_char start_m;
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u_char start_s;
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u_char start_f;
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u_char end_m;
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u_char end_s;
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u_char end_f;
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};
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.Ed
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.It Dv CDIOCREADSUBCHANNEL
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.Pq Li "struct ioc_read_subchannel"
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Read information from the subchannel at the location specified by this
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structure:
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.Bd -literal -offset indent
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struct ioc_read_subchannel {
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u_char address_format;
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#define CD_LBA_FORMAT 1
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#define CD_MSF_FORMAT 2
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u_char data_format;
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#define CD_SUBQ_DATA 0
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#define CD_CURRENT_POSITION 1
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#define CD_MEDIA_CATALOG 2
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#define CD_TRACK_INFO 3
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u_char track;
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int data_len;
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struct cd_sub_channel_info *data;
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};
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.Ed
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.It Dv CDIOREADTOCHEADER
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.Pq Li "struct ioc_toc_header"
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Return summary information about the table of contents for the mounted
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.Tn CD-ROM .
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The information is returned into the following structure:
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.Bd -literal -offset indent
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struct ioc_toc_header {
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u_short len;
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u_char starting_track;
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u_char ending_track;
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};
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.Ed
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.It Dv CDIOREADTOCENTRYS
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.Pq Li "struct ioc_read_toc_entry"
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Return information from the table of contents entries mentioned. (Yes, this
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command name is misspelled.) The argument structure is defined as follows:
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.Bd -literal -offset indent
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struct ioc_read_toc_entry {
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u_char address_format;
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u_char starting_track;
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u_short data_len;
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struct cd_toc_entry *data;
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};
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.Ed
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The requested data is written into an area of size
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.Li data_len
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and pointed to by
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.Li data .
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.It Dv CDIOCSETPATCH
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.Pq Li "struct ioc_patch"
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Attach various audio channels to various output channels. The
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argument structure is defined thusly:
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.Bd -literal -offset indent
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struct ioc_patch {
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u_char patch[4];
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/* one for each channel */
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};
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.Ed
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.It Dv CDIOCGETVOL
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.It Dv CDIOCSETVOL
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.Pq Li "struct ioc_vol"
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Get (set) information about the volume settings of the output channels. The
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argument structure is as follows:
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.Bd -literal -offset indent
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struct ioc_vol
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{
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u_char vol[4];
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/* one for each channel */
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};
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.Ed
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.It Dv CDIOCSETMONO
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Patch all output channels to all source channels.
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.It Dv CDIOCSETSTEREO
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1995-01-25 09:18:56 +00:00
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Patch left source channel to the left output channel and the right
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source channel to the right output channel.
|
1996-01-16 21:29:43 +00:00
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.It Dv CDIOCSETMUTE
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1995-01-25 09:18:56 +00:00
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Mute output without changing the volume settings.
|
1996-01-16 21:29:43 +00:00
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.It Dv CDIOCSETLEFT
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.It Dv CDIOCSETRIGHT
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Attach both output channels to the left (right) source channel.
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.It Dv CDIOCSETDEBUG
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.It Dv CDIOCCLRDEBUG
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Turn on (off) debugging for the appropriate device.
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.It Dv CDIOCPAUSE
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.It Dv CDIOCRESUME
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Pause (resume) audio play, without resetting the location of the read-head.
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.It Dv CDIOCRESET
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1995-01-25 09:18:56 +00:00
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Reset the drive.
|
1996-01-16 21:29:43 +00:00
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.It Dv CDIOCSTART
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.It Dv CDIOCSTOP
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Tell the drive to spin-up (-down) the
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.Tn CD-ROM .
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.It Dv CDIOCALLOW
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.It Dv CDIOCPREVENT
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Tell the drive to allow (prevent) manual ejection of the
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.Tn CD-ROM
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disc. Not all drives support this feature.
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.It Dv CDIOCEJECT
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Eject the
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.Tn CD-ROM .
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.It Dv CDIOCCLOSE
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Tell the drive to close its door and load the media. Not all drives
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support this feature.
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.It Dv CDIOCPITCH
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.Pq Li "struct ioc_pitch"
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For drives that support it, this command instructs the drive to play
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the audio at a faster or slower rate than normal. Values of
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.Li speed
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|
|
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
|
1995-01-25 09:18:56 +00:00
|
|
|
.El
|
|
|
|
.Sh NOTES
|
1996-01-16 21:29:43 +00:00
|
|
|
When a
|
|
|
|
.Tn CD-ROM
|
|
|
|
is changed in a drive controlled by the
|
1995-01-25 09:18:56 +00:00
|
|
|
.Nm
|
1996-01-16 21:29:43 +00:00
|
|
|
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
|
1995-01-25 09:18:56 +00:00
|
|
|
reference the device, the first next open will load a new set of
|
1996-01-16 21:29:43 +00:00
|
|
|
parameters (including disklabel) for the drive.
|
|
|
|
.Pp
|
|
|
|
The audio code in the
|
1995-01-25 09:18:56 +00:00
|
|
|
.Nm
|
1996-01-16 21:29:43 +00:00
|
|
|
driver only support
|
|
|
|
.Tn SCSI-2
|
2000-03-01 14:50:24 +00:00
|
|
|
standard audio commands.
|
|
|
|
Because many
|
1996-01-16 21:29:43 +00:00
|
|
|
.Tn CD-ROM
|
|
|
|
manufacturers have not followed the standard, there are many
|
|
|
|
.Tn CD-ROM
|
2000-03-01 14:50:24 +00:00
|
|
|
drives for which audio will not work.
|
|
|
|
Some work is planned to support
|
1996-01-16 21:29:43 +00:00
|
|
|
some of the more common `broken'
|
|
|
|
.Tn CD-ROM
|
|
|
|
drives; however, this is not yet under way.
|
1998-10-12 03:27:51 +00:00
|
|
|
.Sh CHANGER OPERATION
|
|
|
|
This driver has built-in support for LUN-based CD changers. A LUN-based CD
|
|
|
|
changer is a drive that can hold two or more CDs, but only has one CD
|
|
|
|
player mechanism. Each CD in the drive shows up as a seperate logical unit
|
|
|
|
on the
|
|
|
|
.Tn SCSI
|
|
|
|
bus. The
|
|
|
|
.Nm cd
|
|
|
|
driver automatically recognizes LUN-based changers, and routes commands for
|
|
|
|
changers through an internal scheduler. The scheduler prevents changer
|
|
|
|
"thrashing", which is caused by sending commands to different LUNs in the
|
|
|
|
changer at the same time.
|
|
|
|
.Pp
|
|
|
|
The scheduler honors minimum and maximum time
|
|
|
|
quanta that the driver will spend on a particular LUN. The minimum time
|
|
|
|
is the guaranteed minimum amount of time that the driver will spend on a
|
|
|
|
given LUN, even if there is no oustanding I/O for that LUN. The maximum
|
|
|
|
time is the maximum amount of time the changer will spend on a LUN if there
|
|
|
|
is oustdanding I/O for another LUN. If there is no outstanding I/O for
|
|
|
|
another LUN, the driver will allow indefinite access to a given LUN.
|
|
|
|
.Pp
|
|
|
|
The minimum and maximum time quanta are configurable via kernel options and
|
|
|
|
also via sysctl variables. The kernel options are:
|
|
|
|
|
|
|
|
.Bl -tag -width 1234 -compact
|
|
|
|
.It Cd options "CHANGER_MIN_BUSY_SECONDS=3"
|
|
|
|
.It Cd options "CHANGER_MAX_BUSY_SECONDS=11"
|
|
|
|
.El
|
|
|
|
.Pp
|
|
|
|
The sysctl variables are:
|
|
|
|
.Pp
|
|
|
|
.Bl -tag -width 1234 -compact
|
|
|
|
.It Cd kern.cam.cd.changer.min_busy_seconds
|
|
|
|
.It Cd kern.cam.cd.changer.max_busy_seconds
|
|
|
|
.El
|
|
|
|
.Pp
|
|
|
|
It is suggested that the user try experimenting with the minimum and
|
|
|
|
maximum timeouts via the sysctl variables to arrive at the proper values
|
|
|
|
for your changer. Once you have settled on the proper timeouts for your
|
|
|
|
changer, you can then put them in your kernel config file.
|
|
|
|
.Pp
|
|
|
|
If your system does have a LUN-based changer, you may notice that the
|
|
|
|
probe messages for the various LUNs of the changer will continue to appear
|
|
|
|
while the boot process is going on. This is normal, and is caused by the
|
|
|
|
changer scheduling code.
|
1995-01-25 09:18:56 +00:00
|
|
|
.Sh FILES
|
|
|
|
.Bl -tag -width /dev/rcd[0-9][a-h] -compact
|
|
|
|
.It Pa /dev/cd[0-9][a-h]
|
1996-01-16 21:29:43 +00:00
|
|
|
block mode
|
|
|
|
.Tn CD-ROM
|
|
|
|
devices
|
1995-01-25 09:18:56 +00:00
|
|
|
.It Pa /dev/rcd[0-9][a-h]
|
1996-01-16 21:29:43 +00:00
|
|
|
raw mode
|
|
|
|
.Tn CD-ROM
|
|
|
|
devices
|
1995-01-25 09:18:56 +00:00
|
|
|
.El
|
|
|
|
.Sh DIAGNOSTICS
|
|
|
|
None.
|
|
|
|
.Sh SEE ALSO
|
1998-10-12 03:27:51 +00:00
|
|
|
.Xr da 4 ,
|
1999-08-15 10:48:36 +00:00
|
|
|
.Xr scsi 4 ,
|
1996-02-11 22:38:05 +00:00
|
|
|
.Xr disklabel 5 ,
|
1997-02-20 15:14:59 +00:00
|
|
|
.Xr disklabel 8 ,
|
|
|
|
.Xr cd 9
|
1996-01-16 21:29:43 +00:00
|
|
|
.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.
|
1998-10-12 03:27:51 +00:00
|
|
|
.Pp
|
|
|
|
There is no mechanism currently to set different minimum and maximum
|
|
|
|
timeouts for different CD changers; the timeout values set by the kernel
|
|
|
|
options or the sysctl variables apply to all LUN-based CD changers in the
|
|
|
|
system. It is possible to implement such support, but the sysctl
|
|
|
|
impelmentation at least would be rather inelegant, because of the current
|
|
|
|
inability of the sysctl code to handle the addition of nodes after compile
|
|
|
|
time. Thus, it would take one dynamically sized sysctl variable and a
|
|
|
|
userland utility to get/set the timeout values. Implementation of separate
|
|
|
|
timeouts for different CD devices in the kernel config file would likely
|
|
|
|
require modification of
|
|
|
|
.Xr config 8
|
|
|
|
to support the two timeouts when hardwiring
|
|
|
|
.Nm cd
|
|
|
|
devices.
|
1995-01-25 09:18:56 +00:00
|
|
|
.Sh HISTORY
|
|
|
|
This
|
1998-10-12 03:27:51 +00:00
|
|
|
.Nm cd
|
|
|
|
driver is based upon the
|
|
|
|
.Nm cd
|
1999-02-27 07:56:08 +00:00
|
|
|
driver written by Julian Elischer, which appeared in 386BSD 0.1. The
|
1998-10-12 03:27:51 +00:00
|
|
|
CAM version of the
|
|
|
|
.Nm cd
|
|
|
|
driver was written by Kenneth Merry and first appeared in
|
|
|
|
.Fx 3.0 .
|