guspnp(4) [netbsd man page]
GUSPNP(4) BSD Kernel Interfaces Manual GUSPNP(4) NAME
guspnp -- Am78C201 audio device driver SYNOPSIS
guspnp* at isapnp? audio* at audiobus? There should be no limit caused by the driver on the number of drivers or cards active in the system. DESCRIPTION
The guspnp driver provides support for audio subsystems using the Interwave (Am78C20x) family of ICs, usually the Gravis Ultrasound Plug and Play. Unlike the gus driver guspnp driver does not require any local memory for the IC, but uses the codec for both playback and recording. The guspnp driver can simultaneously playback and record 8- and 16-bit samples at frequencies from 5.51kHz to 48kHz. The guspnp driver relies on isapnp to allocate suitable resources for it. This version of the driver only uses the first logical device of the five the Interwave IC has. The four unused logical devices are the ATAPI CD-ROM device, PnP Joystick device, legacy soundcard emulation device (SoundBlaster) and MIDI serial device. Support for at least ATAPI CD-ROM and Joystick is being worked on. This version of the driver will use 1 IRQ and 2 DRQs. HARDWARE
Cards supported by the guspnp driver include: Gravis Ultrasound PNP, and compatibles SEE ALSO
audio(4), gus(4), isapnp(4) REFERENCES
Interwave(tm) IC Am78C201/202 Programmer's Guide Rev. 2. 1996. Advanced Micro Devices. HISTORY
The guspnp driver appeared in NetBSD 1.3. AUTHORS
Kari Mettinen <Kari.Mettinen@helsinki.fi>, University of Helsinki. BUGS
Sometimes you can cause a hiss on either left or right channel, or both. You can usually make it disappear by playing random data, however this might not be a very nice thing to your audio equipment, but it is the only way I have found out to be effective. Only the Codec is used in this version of the driver, therefore only 2 channels are supported (left and right). Also sound quality is proba- bly worse at lower kHz compared to playing through the synthesizer which does interpolation. If the implementation has a 'bad' oscillator, using frequencies 44.8kHz and 38.4kHz will result in incorrect playback frequency. The author has a GUS PnP Pro which displays this behavior. Other members of the Interwave family have not been tested and don't have the glue needed to make them work. Should someone need to implement it, not many changes in the existing code are needed. Output voltage control in register CFIG2 [7] should be set differently for some other members of the family. Other architectures than i386 haven't been tested. The bus_space abstraction has been used from the beginning, so it should work. BSD
June 22, 2005 BSD
Check Out this Related Man Page
CMPCI(4) BSD Kernel Interfaces Manual CMPCI(4) NAME
cmpci -- C-Media CMI8x38 audio device driver SYNOPSIS
cmpci* at pci? dev ? function ? audio* at audiobus? mpu* at cmpci? opl* at cmpci? flags 1 DESCRIPTION
The cmpci device driver supports C-Media CMI8x38 based sound cards. The device has SPDIF input/output interfaces, 16bit CODEC with analog mixer, OPL3 FM Synthesizer, and MPU401 compatible MIDI I/O port inter- face. MIXER DEVICE
The mixer device of cmpci driver can be accessed via mixerctl(1) command. The complex structure is analyzed as follows. SPDIF in ---------------------- #1(coax)->|spdin1 | R ----------------------- #2(opt)-->|spdin2 spdif.input |--*->--|spdin spdif.output |--> SPDIF -->|spdout | | -->|playback | output | ---------------------- | | ----------------------- --------------------<------+-* ---------<-------------------+-+---------------------------------- | ------------------------ | | ----------------------- | -->|legacy spdif.output. |--+-*-->|spdout | | -->|wave playback | ----->|spdin spdif.monitor |---- | | ------------------------ NC-|off | | | ---------<-- spdif ----------------------- | | -------+------- dac ------------ ----------------- v | wave -->|playback.mode|---->|inputs.dac|-*->|inputs.dac.mute|->----- | playback --------------- ------------ R ----------------- | + | | ----------------- --------------------- |mix| | FM synthesizer -->|inputs.fmsynth |--*->|inputs.fmsynth.mute|-->----- | ----------------- R --------------------- *->-- CD ---------------------- --------------------------- v LINE-IN ->|inputs.{cd,line,aux}|-*>|inputs.{cd,line,aux}.mute|->----- AUX ---------------------- R --------------------------- | | ------------------ | | PC-SPK -->| inputs.speaker |----------------------------------->| + | ------------------ | | ------------------- ------------ ----------------- |mix| MIC --*-->|inputs.mic.preamp|->|inputs.mic|->|inputs.mic.mute|->| | | ------------------- ------------ ----------------- ----- | ------------ ----------------- | --->|record.mic|-->| | v ------------ | record.source |-->to ----------- *R-->| (select, mix) | recording |outputs.*|--> ----------------- ----------- SPK (front) Note the 2nd SPDIF input exists only on CMI8738/PCI-6ch versions. MIXER EXAMPLES
Here are examples about wave playback and SPDIF input/output ports. Playback to speaker, SPDIF input to SPDIF output mixerctl -w playback.mode=dac spdif.output=spdin spdif.monitor=off Playback to SPDIF output, SPDIF input to speaker mixerctl -w playback.mode=spdif spdif.output=playback spdif.output.playback=wave spdif.monitor=spdin SPDIF input to both SPDIF output and speaker mixerctl -w spdif.output=spdin spdif.monitor=spdin Playback to both SPDIF output and speaker mixerctl -w playback.mode=spdif spdif.output=playback spdif.output.playback=wave spdif.monitor=spdout Mix playback and SPDIF input to speaker mixerctl -w playback.mode=dac spdif.monitor=spdin SEE ALSO
mixerctl(1), audio(4), midi(4), mpu(4), opl(4), pci(4) HISTORY
The cmpci device driver appeared in NetBSD 1.5. BUGS
4ch/6ch playback is not yet available. Joystick port is not supported. spdif.output.playback=legacy does not seem to work properly. BSD
June 22, 2005 BSD