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Diffstat (limited to 'Documentation/sound/oss/Maestro3')
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diff --git a/Documentation/sound/oss/Maestro3 b/Documentation/sound/oss/Maestro3 deleted file mode 100644 index a113718..0000000 --- a/Documentation/sound/oss/Maestro3 +++ /dev/null @@ -1,92 +0,0 @@ - An OSS/Lite Driver for the ESS Maestro3 family of sound chips - - Zach Brown, January 2001 - -Driver Status and Availability ------------------------------- - -The most recent version of this driver will hopefully always be available at - http://www.zabbo.net/maestro3/ - -I will try and maintain the most recent stable version of the driver -in both the stable and development kernel lines. - -Historically I've sucked pretty hard at actually doing that, however. - -ESS Maestro3 Chip Family ------------------------ - -The 'Maestro3' is much like the Maestro2 chip. The noted improvement -is the removal of the silicon in the '2' that did PCM mixing. All that -work is now done through a custom DSP called the ASSP, the Asynchronus -Specific Signal Processor. - -The 'Allegro' is a baby version of the Maestro3. I'm not entirely clear -on the extent of the differences, but the driver supports them both :) - -The 'Allegro' shows up as PCI ID 0x1988 and the Maestro3 as 0x1998, -both under ESS's vendor ID of 0x125D. The Maestro3 can also show up as -0x199a when hardware strapping is used. - -The chip can also act as a multi function device. The modem IDs follow -the audio multimedia device IDs. (so the modem part of an Allegro shows -up as 0x1989) - -Driver OSS Behavior --------------------- - -This OSS driver exports /dev/mixer and /dev/dsp to applications, which -mostly adhere to the OSS spec. This driver doesn't register itself -with /dev/sndstat, so don't expect information to appear there. - -The /dev/dsp device exported behaves as expected. Playback is -supported in all the various lovely formats. 8/16bit stereo/mono from -8khz to 48khz, with both read()/write(), and mmap(). - -/dev/mixer is an interface to the AC'97 codec on the Maestro3. It is -worth noting that there are a variety of AC'97s that can be wired to -the Maestro3. Which is used is entirely up to the hardware implementor. -This should only be visible to the user by the presence, or lack, of -'Bass' and 'Treble' sliders in the mixer. Not all AC'97s have them. -The Allegro has an onchip AC'97. - -The driver doesn't support MIDI or FM playback at the moment. - -Compiling and Installing ------------------------- - -With the drivers inclusion into the kernel, compiling and installing -is the same as most OSS/Lite modular sound drivers. Compilation -of the driver is enabled through the CONFIG_SOUND_MAESTRO3 variable -in the config system. - -It may be modular or statically linked. If it is modular it should be -installed with the rest of the modules for the kernel on the system. -Typically this will be in /lib/modules/ somewhere. 'alias sound-slot-0 -maestro3' should also be added to your module configs (typically -/etc/modprobe.conf) if you're using modular OSS/Lite sound and want to -default to using a maestro3 chip. - -There are very few options to the driver. One is 'debug' which will -tell the driver to print minimal debugging information as it runs. This -can be collected with 'dmesg' or through the klogd daemon. - -One is 'external_amp', which tells the driver to attempt to enable -an external amplifier. This defaults to '1', you can tell the driver -not to bother enabling such an amplifier by setting it to '0'. - -And the last is 'gpio_pin', which tells the driver which GPIO pin number -the external amp uses (0-15), The Allegro uses 8 by default, all others 1. -If everything loads correctly and seems to be working but you get no sound, -try tweaking this value. - -Systems known to need a different value - Panasonic ToughBook CF-72: gpio_pin=13 - -Power Management ----------------- - -This driver has a minimal understanding of PCI Power Management. It will -try and power down the chip when the system is suspended, and power -it up with it is resumed. It will also try and power down the chip -when the machine is shut down. |