SoundPro
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- Documentation for the SoundPro CMI8330 extensions in the WSS driver (ad1848.o)
- ------------------------------------------------------------------------------
- ( Be sure to read Documentation/sound/CMI8330 too )
- Ion Badulescu, ionut@cs.columbia.edu
- February 24, 1999
- (derived from the OPL3-SA2 documentation by Scott Murray)
- The SoundPro CMI8330 (ISA) is a chip usually found on some Taiwanese
- motherboards. The official name in the documentation is CMI8330, SoundPro
- is the nickname and the big inscription on the chip itself.
- The chip emulates a WSS as well as a SB16, but it has certain differences
- in the mixer section which require separate support. It also emulates an
- MPU401 and an OPL3 synthesizer, so you probably want to enable support
- for these, too.
- The chip identifies itself as an AD1848, but its mixer is significantly
- more advanced than the original AD1848 one. If your system works with
- either WSS or SB16 and you are having problems with some mixer controls
- (no CD audio, no line-in, etc), you might want to give this driver a try.
- Detection should work, but it hasn't been widely tested, so it might still
- mis-identify the chip. You can still force soundpro=1 in the modprobe
- parameters for ad1848. Please let me know if it happens to you, so I can
- adjust the detection routine.
- The chip is capable of doing full-duplex, but since the driver sees it as an
- AD1848, it cannot take advantage of this. Moreover, the full-duplex mode is
- not achievable through the WSS interface, b/c it needs a dma16 line which is
- assigned only to the SB16 subdevice (with isapnp). Windows documentation
- says the user must use WSS Playback and SB16 Recording for full-duplex, so
- it might be possible to do the same thing under Linux. You can try loading
- up both ad1848 and sb then use one for playback and the other for
- recording. I don't know if this works, b/c I haven't tested it. Anyway, if
- you try it, be very careful: the SB16 mixer *mostly* works, but certain
- settings can have unexpected effects. Use the WSS mixer for best results.
- There is also a PCI SoundPro chip. I have not seen this chip, so I have
- no idea if the driver will work with it. I suspect it won't.
- As with PnP cards, some configuration is required. There are two ways
- of doing this. The most common is to use the isapnptools package to
- initialize the card, and use the kernel module form of the sound
- subsystem and sound drivers. Alternatively, some BIOS's allow manual
- configuration of installed PnP devices in a BIOS menu, which should
- allow using the non-modular sound drivers, i.e. built into the kernel.
- Since in this latter case you cannot use module parameters, you will
- have to enable support for the SoundPro at compile time.
- The IRQ and DMA values can be any that are considered acceptable for a
- WSS. Assuming you've got isapnp all happy, then you should be able to
- do something like the following (which *must* match the isapnp/BIOS
- configuration):
- modprobe ad1848 io=0x530 irq=11 dma=0 soundpro=1
- -and maybe-
- modprobe sb io=0x220 irq=5 dma=1 dma16=5
- -then-
- modprobe mpu401 io=0x330 irq=9
- modprobe opl3 io=0x388
- If all goes well and you see no error messages, you should be able to
- start using the sound capabilities of your system. If you get an
- error message while trying to insert the module(s), then make
- sure that the values of the various arguments match what you specified
- in your isapnp configuration file, and that there is no conflict with
- another device for an I/O port or interrupt. Checking the contents of
- /proc/ioports and /proc/interrupts can be useful to see if you're
- butting heads with another device.
- If you do not see the chipset version message, and none of the other
- messages present in the system log are helpful, try adding 'debug=1'
- to the ad1848 parameters, email me the syslog results and I'll do
- my best to help.
- Lastly, if you're using modules and want to set up automatic module
- loading with kmod, the kernel module loader, here is the section I
- currently use in my conf.modules file:
- # Sound
- post-install sound modprobe -k ad1848; modprobe -k mpu401; modprobe -k opl3
- options ad1848 io=0x530 irq=11 dma=0
- options sb io=0x220 irq=5 dma=1 dma16=5
- options mpu401 io=0x330 irq=9
- options opl3 io=0x388
- The above ensures that ad1848 will be loaded whenever the sound system
- is being used.
- Good luck.
- Ion
- NOT REALLY TESTED:
- - recording
- - recording device selection
- - full-duplex
- TODO:
- - implement mixer support for surround, loud, digital CD switches.
- - come up with a scheme which allows recording volumes for each subdevice.
- This is a major OSS API change.