faac9650a5
changes:
o rip the old select from his distribution to prevent extra pollution
o the code now uses audio dma, helps reduce clicks
o improved card support, should work in full duplex on sb16 cards
o add better voxware ioctl support pointed out by Joao Carlos Mendes
Luis <jonny@coppe.ufrj.br>
o remove an unused file that I included for more complete history
o and MANY other changes
I have personally tested this code with a CS4237 based card and an AWE32
(non-PnP). Both cards worked fine in 8bit and 16bit mode.
127 lines
4.7 KiB
Plaintext
127 lines
4.7 KiB
Plaintext
--- A new FreeBSD audio driver ---
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by Luigi Rizzo (luigi@iet.unipi.it)
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This is an experimental version of the audio driver for FreeBSD.
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I have almost completely rewritten the main parts of the code,
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starting from the Voxware 3.5-alpha release with patches from
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Amancio Hasty. The only file which is largely similar to the original
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ones is "soundcard.h" (for compatibility reasons, since it contains
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the definition of all the ioctls).
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Visit http://www.iet.unipi.it/~luigi/FreeBSD.html for the latest
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information on the drivers. There you can obtain the latest source
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package that includes documentation on the design of the driver.
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CARD SUPPORT INFORMATION:
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For PnP cards, I also include the vendor_id and serial numbers of
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cards I have encountered.
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CS4236: PnP id 0x3642630e
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CS4237: PnP id 0x3742630e
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works like a charm. All modes, including full duplex, supported in
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MSS mode.
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CS4232: PnP id 0x3242630e
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this chip is reported as broken in the OSS documentation. As a
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matter of fact, on my Intel Zappa motherboard, I have problems in
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make it use the secondary DMA channel. I have it working in
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half duplex (both capture and playback) in SB3.2 emulation,
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and working in playback mode in MSS emulation.
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OPTi931: PnP id 0x3109143e
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The data sheets of this chip are very cryptic and do not match
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what the cards I have seem to do. I have it working
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in WSS emulation, in full duplex and all modes.
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In SB emulation mode the driver does not work yet (maybe I do
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not initialize it the right way). It is not a major concern
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anyways.
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I am strongly convinced of a couple of bugs in the chip. I have
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sent email to OPTI but got no reply so far. The bugs are:
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- you cannot set both playback and capture format to use
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a companded mode (ULAW, ALAW). If you do, the card will screw
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up on the capture section.
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The driver has a partial fix in software: when using ULAW, it
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programs ULAW on the playback section, U8 on the capture, and
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does a conversion in software (much like the SBPro). Of course
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you lose 4-5 bits of dynamic range in the process.
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- in full duplex (and single DMA mode), the card occasionally
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misses interrupts, or generates spurious ones. Spurious ints are
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not problematic since they can be ignored, but missed ones are
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as you can imagine... This is fixed by auto-dma mode.
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SB16 PnP: PnP id 0xXX008c0e
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There are many such cards (plain SB16 PnP, AWE32, AWE64, Vibra16,
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etc.) all differing in the PnP id. They have different synthesis
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devices, which we do not support, so we are not affected by these
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differences. Don't worry if the driver identifies the card as a
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different SB16 than the one you have.
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Full duplex support of this card is tricky since one channel can
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work in 16-bit and the other in 8-bit mode. You will need to use
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the new set of ioctl to use separate data formats on the two
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channels (the vat driver does this). Of course, quality in 8-bit
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is much lower than in 16-bit.
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Full duplex operation is unsupported by Creative. It seems to
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work, although on my Vibra16 the command to stop DMA transfer
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seems to erroneously affect both channels instead of the one
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they are issued for. The driver has a workaround, but I cannot
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guarantee that it works for everybody. I have had several
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positive reports.
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Yamaha SA2
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this card emulates a WSS or SB. Have reports that it works, although
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it has mixer problems (maybe the driver has the wrong set of
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parameters).
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Ensoniq Soundscape VIVO
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this card emulates a WSS or SB. Have reports that it works.
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GusPnP: PnP id 0x0100561e
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I have code to recognize the board as MSS, but some initializations
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of the IW chip is still missing, so the card is not supported yet.
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I am working on this problem...
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OPTI924: PnP
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I have this card but it is still unsupported.
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OPTI925: PnP id 0x2509143e
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there is code to recognize it as a SB clone. I have reports that
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it probes ok, but not sure if it works.
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OPTI930:
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should work as an MSS clone, but support for it is not implemented
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yet.
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ESS1868
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this card is not supported yet. It might work in SB emulation but
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am not sure.
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ESS688
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this card is used on many notebook. I don't have docs on this card
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so I cannot support it. Pointers to the data sheets are welcome.
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PCI cards:
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some vendors have PCI cards. This code _cannot_ work on these
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cards as it is now, since they cannot obviously use the ISA DMA
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controller. As there are no data sheets available for these PCI
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cards, none of them is supported at the moment, although support
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should be easy as soon as I can put my hands on the data sheets
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and cards.
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