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Diffstat (limited to 'kernel/Documentation/sound/oss/Opti')
| -rw-r--r-- | kernel/Documentation/sound/oss/Opti | 218 |
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diff --git a/kernel/Documentation/sound/oss/Opti b/kernel/Documentation/sound/oss/Opti new file mode 100644 index 000000000..4cd5d9ab3 --- /dev/null +++ b/kernel/Documentation/sound/oss/Opti @@ -0,0 +1,218 @@ +Support for the OPTi 82C931 chip +-------------------------------- +Note: parts of this README file apply also to other +cards that use the mad16 driver. + +Some items in this README file are based on features +added to the sound driver after Linux-2.1.91 was out. +By the time of writing this I do not know which official +kernel release will include these features. +Please do not report inconsistencies on older Linux +kernels. + +The OPTi 82C931 is supported in its non-PnP mode. +Usually you do not need to set jumpers, etc. The sound driver +will check the card status and if it is required it will +force the card into a mode in which it can be programmed. + +If you have another OS installed on your computer it is recommended +that Linux and the other OS use the same resources. + +Also, it is recommended that resources specified in /etc/modprobe.d/*.conf +and resources specified in /etc/isapnp.conf agree. + +Compiling the sound driver +-------------------------- +I highly recommend that you build a modularized sound driver. +This document does not cover a sound-driver which is built in +the kernel. + +Sound card support should be enabled as a module (chose m). +Answer 'm' for these items: + Generic OPL2/OPL3 FM synthesizer support (CONFIG_SOUND_ADLIB) + Microsoft Sound System support (CONFIG_SOUND_MSS) + Support for OPTi MAD16 and/or Mozart based cards (CONFIG_SOUND_MAD16) + FM synthesizer (YM3812/OPL-3) support (CONFIG_SOUND_YM3812) + +The configuration menu may ask for addresses, IRQ lines or DMA +channels. If the card is used as a module the module loading +options will override these values. + +For the OPTi 931 you can answer 'n' to: + Support MIDI in older MAD16 based cards (requires SB) (CONFIG_SOUND_MAD16_OLDCARD) +If you do need MIDI support in a Mozart or C928 based card you +need to answer 'm' to the above question. In that case you will +also need to answer 'm' to: + '100% Sound Blaster compatibles (SB16/32/64, ESS, Jazz16) support' (CONFIG_SOUND_SB) + +Go on and compile your kernel and modules. Install the modules. Run depmod -a. + +Using isapnptools +----------------- +In most systems with a PnP BIOS you do not need to use isapnp. The +initialization provided by the BIOS is sufficient for the driver +to pick up the card and continue initialization. + +If that fails, or if you have other PnP cards, you need to use isapnp +to initialize the card. +This was tested with isapnptools-1.11 but I recommend that you use +isapnptools-1.13 (or newer). Run pnpdump to dump the information +about your PnP cards. Then edit the resulting file and select +the options of your choice. This file is normally installed as +/etc/isapnp.conf. + +The driver has one limitation with respect to I/O port resources: +IO3 base must be 0x0E0C. Although isapnp allows other ports, this +address is hard-coded into the driver. + +Using kmod and autoloading the sound driver +------------------------------------------- +Config files in '/etc/modprobe.d/' are used as below: + +alias mixer0 mad16 +alias audio0 mad16 +alias midi0 mad16 +alias synth0 opl3 +options sb mad16=1 +options mad16 irq=10 dma=0 dma16=1 io=0x530 joystick=1 cdtype=0 +options opl3 io=0x388 +install mad16 /sbin/modprobe -i mad16 && /sbin/ad1848_mixer_reroute 14 8 15 3 16 6 + +If you have an MPU daughtercard or onboard MPU you will want to add to the +"options mad16" line - eg + +options mad16 irq=5 dma=0 dma16=3 io=0x530 mpu_io=0x330 mpu_irq=9 + +To set the I/O and IRQ of the MPU. + + +Explain: + +alias mixer0 mad16 +alias audio0 mad16 +alias midi0 mad16 +alias synth0 opl3 + +When any sound device is opened the kernel requests auto-loading +of char-major-14. There is a built-in alias that translates this +request to loading the main sound module. + +The sound module in its turn will request loading of a sub-driver +for mixer, audio, midi or synthesizer device. The first 3 are +supported by the mad16 driver. The synth device is supported +by the opl3 driver. + +There is currently no way to autoload the sound device driver +if more than one card is installed. + +options sb mad16=1 + +This is left for historical reasons. If you enable the +config option 'Support MIDI in older MAD16 based cards (requires SB)' +or if you use an older mad16 driver it will force loading of the +SoundBlaster driver. This option tells the SB driver not to look +for a SB card but to wait for the mad16 driver. + +options mad16 irq=10 dma=0 dma16=1 io=0x530 joystick=1 cdtype=0 +options opl3 io=0x388 + +post-install mad16 /sbin/ad1848_mixer_reroute 14 8 15 3 16 6 + +This sets resources and options for the mad16 and opl3 drivers. +I use two DMA channels (only one is required) to enable full duplex. +joystick=1 enables the joystick port. cdtype=0 disables the cd port. +You can also set mpu_io and mpu_irq in the mad16 options for the +uart401 driver. + +This tells modprobe to run /sbin/ad1848_mixer_reroute after +mad16 is successfully loaded and initialized. The source +for ad1848_mixer_reroute is appended to the end of this readme +file. It is impossible for the sound driver to know the actual +connections to the mixer. The 3 inputs intended for cd, synth +and line-in are mapped to the generic inputs line1, line2 and +line3. This program reroutes these mixer channels to their +right names (note the right mapping depends on the actual sound +card that you use). +The numeric parameters mean: + 14=line1 8=cd - reroute line1 to the CD input. + 15=line2 3=synth - reroute line2 to the synthesizer input. + 16=line3 6=line - reroute line3 to the line input. +For reference on other input names look at the file +/usr/include/linux/soundcard.h. + +Using a joystick +----------------- +You must enable a joystick in the mad16 options. (also +in /etc/isapnp.conf if you use it). +Tested with regular analog joysticks. + +A CDROM drive connected to the sound card +----------------------------------------- +The 82C931 chip has support only for secondary ATAPI cdrom. +(cdtype=8). Loading the mad16 driver resets the C931 chip +and if a cdrom was already mounted it may cause a complete +system hang. Do not use the sound card if you have an alternative. +If you do use the sound card it is important that you load +the mad16 driver (use "modprobe mad16" to prevent auto-unloading) +before the cdrom is accessed the first time. + +Using the sound driver built-in to the kernel may help here, but... +Most new systems have a PnP BIOS and also two IDE controllers. +The IDE controller on the sound card may be needed only on older +systems (which have only one IDE controller) but these systems +also do not have a PnP BIOS - requiring isapnptools and a modularized +driver. + +Known problems +-------------- +1. See the section on "A CDROM drive connected to the sound card". + +2. On my system the codec cannot capture companded sound samples. + (eg., recording from /dev/audio). When any companded capture is + requested I get stereo-16 bit samples instead. Playback of + companded samples works well. Apparently this problem is not common + to all C931 based cards. I do not know how to identify cards that + have this problem. + +Source for ad1848_mixer_reroute.c +--------------------------------- +#include <stdio.h> +#include <fcntl.h> +#include <linux/soundcard.h> + +static char *mixer_names[SOUND_MIXER_NRDEVICES] = + SOUND_DEVICE_LABELS; + +int +main(int argc, char **argv) { + int val, from, to; + int i, fd; + + fd = open("/dev/mixer", O_RDWR); + if(fd < 0) { + perror("/dev/mixer"); + return 1; + } + + for(i = 2; i < argc; i += 2) { + from = atoi(argv[i-1]); + to = atoi(argv[i]); + + if(to == SOUND_MIXER_NONE) + fprintf(stderr, "%s: turning off mixer %s\n", + argv[0], mixer_names[to]); + else + fprintf(stderr, "%s: rerouting mixer %s to %s\n", + argv[0], mixer_names[from], mixer_names[to]); + + val = from << 8 | to; + + if(ioctl(fd, SOUND_MIXER_PRIVATE2, &val)) { + perror("AD1848 mixer reroute"); + return 1; + } + } + + return 0; +} + |