1.\" 2.\" Copyright (c) 1998, Luigi Rizzo 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd June 3, 1998 29.Dt PCM 4 30.Os FreeBSD 31.Sh NAME 32.Nm pcm 33.Nd FreeBSD PCM audio device driver 34.Sh SYNOPSIS 35For a card with bridge driver support, and a PnP card: 36.Cd "device pcm" 37.Pp 38For a card without bridge driver support, and a non-PnP card: 39.Cd "device pcm0 at isa? port? irq 5 drq 1 flags 0x15" 40.Sh DESCRIPTION 41The 42.Nm 43driver provides support for PCM audio play and capture. This driver 44also supports various PCI and WSS/MSS compatible ISA sound cards, and 45AC97 mixer. True full duplex operation is available on most cards. 46.Pp 47If your sound card is supported by a bridge driver, 48.Nm 49driver works 50in conjunction with the bridge driver. 51.Pp 52Apart from the usual parameters, the flags field is used to specify 53the secondary DMA channel (generally used for capture in full duplex 54cards). Flags are set to 0 for cards not using a secondary DMA 55channel, or to 0x10 + C to specify channel C. 56.Pp 57The driver works best with WSS/MSS cards, which have a very clean 58architecture and an orthogonal set of features. They also happen to be 59among the cheapest audio cards on the market. 60.Pp 61The driver does its best to recognize the installed harware and drive 62it correctly, so that you don't have to give too many details in the 63kernel config files. For PCI and ISA PnP cards this is actually easy 64since they identify themselves. For legacy ISA cards, the driver looks 65for MSS cards at addresses 0x530 and 0x604 (obviously, unless overridden 66in the kernel config file by specifying an address). 67 68.Sh IOCTL 69The driver supports most of the Voxware ioctls(), and most 70applications work unmodified (including popular mpeg players and linux 71binaries). A few 72differences exist (the most important one is the ability to use 73memory-mapped access to the audio buffers). As a consequence, some 74applications may need to be recompiled with a slightly modified 75audio module. See /usr/include/sys/soundcard.h for a complete 76list of the supported ioctls. 77 78.Sh SUPPORTED CARDS 79.Pp 80Below we include a list of supported codecs/cards. If your sound card 81is not listed here, it may be supported by a bridge driver. 82 83.Bl -tag -width 2m % begin list 84.It CS4237, CS4236, CS4232, CS4231 (ISA) 85.Pp 86All these cards work perfectly in full duplex using the MSS mode. 87This chipset is used, among others, on the A/Open AW35 and AW32, on 88some Intel motherboards, and (the CS4231) on some non-PnP cards. 89.Pp 90The CS4232 is reported as buggy in the Voxware documentation but 91I am not sure if this is true. On one of my Intel motherboards, 92capture does not work simply because the capture DMA channel is 93not wired to the ISA DMA controller. 94 95.It Yamaha OPL-SAx (ISA) 96.Pp 97Works perfectly in all modes. This chip is used in several PnP cards, 98but also (in non-PnP mode) on motherboards and laptops (e.g. the 99Toshiba Libretto). 100 101.It OPTi931 (ISA) 102.Pp 103The chip is buggy, but the driver has many workarounds to make it work 104in full duplex because for some time these were the only full duplex 105cards I could find. u-law formats uses U8 format internally because of 106a bug in the chip. 107 108.It Trident 4DWave DX/NX (PCI) 109.Pp 110.It ENSONIQ AudioPCI ES1370/1371 (PCI) 111.Pp 112Creative Labs SoundBlaster PCI is supported as well. 113 114.It NeoMagic 256AV/ZX (PCI) 115.Pp 116.El 117.Pp 118.Sh DIAGNOSTICS AND TROUBLESHOOTING 119.Bl -tag -width 2m 120.It ac97: dac not ready 121AC97 codec is not likely to be accompanied with the sound card. 122 123.It unsupported subdevice XX 124A device node is not created properly. 125 126.El 127.Sh BUGS 128Some features of your cards (e.g. global volume control) might not 129be supported on all devices. 130.Sh HISTORY 131The 132.Nm 133device driver first appeared in 134.Fx 2.2.6 , 135rewritten in 136.Fx 4.0 . 137.Sh SEE ALSO 138.Xr sbc 4 139.Xr gusc 4 140.Xr csa 4 141.Sh AUTHORS 142.An Luigi Rizzo Aq luigi@iet.unipi.it 143initially wrote the .Nm device driver and this manual page. 144.An Cameron Grant Aq gandalf@vilnya.demon.co.uk 145totally revised the device driver. 146.An Seigo Tanimura Aq tanimura@r.dl.itc.u-tokyo.ac.jp 147revised this manual page. 148