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Diffstat (limited to 'Documentation/sound/alsa/README.maya44')
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diff --git a/Documentation/sound/alsa/README.maya44 b/Documentation/sound/alsa/README.maya44 deleted file mode 100644 index 67b2ea1cc31d..000000000000 --- a/Documentation/sound/alsa/README.maya44 +++ /dev/null @@ -1,163 +0,0 @@ -NOTE: The following is the original document of Rainer's patch that the -current maya44 code based on. Some contents might be obsoleted, but I -keep here as reference -- tiwai - ----------------------------------------------------------------- - -STATE OF DEVELOPMENT: - -This driver is being developed on the initiative of Piotr Makowski (oponek@gmail.com) and financed by Lars Bergmann. -Development is carried out by Rainer Zimmermann (mail@lightshed.de). - -ESI provided a sample Maya44 card for the development work. - -However, unfortunately it has turned out difficult to get detailed programming information, so I (Rainer Zimmermann) had to find out some card-specific information by experiment and conjecture. Some information (in particular, several GPIO bits) is still missing. - -This is the first testing version of the Maya44 driver released to the alsa-devel mailing list (Feb 5, 2008). - - -The following functions work, as tested by Rainer Zimmermann and Piotr Makowski: - -- playback and capture at all sampling rates -- input/output level -- crossmixing -- line/mic switch -- phantom power switch -- analogue monitor a.k.a bypass - - -The following functions *should* work, but are not fully tested: - -- Channel 3+4 analogue - S/PDIF input switching -- S/PDIF output -- all inputs/outputs on the M/IO/DIO extension card -- internal/external clock selection - - -*In particular, we would appreciate testing of these functions by anyone who has access to an M/IO/DIO extension card.* - - -Things that do not seem to work: - -- The level meters ("multi track") in 'alsamixer' do not seem to react to signals in (if this is a bug, it would probably be in the existing ICE1724 code). - -- Ardour 2.1 seems to work only via JACK, not using ALSA directly or via OSS. This still needs to be tracked down. - - -DRIVER DETAILS: - -the following files were added: - -pci/ice1724/maya44.c - Maya44 specific code -pci/ice1724/maya44.h -pci/ice1724/ice1724.patch -pci/ice1724/ice1724.h.patch - PROPOSED patch to ice1724.h (see SAMPLING RATES) -i2c/other/wm8776.c - low-level access routines for Wolfson WM8776 codecs -include/wm8776.h - - -Note that the wm8776.c code is meant to be card-independent and does not actually register the codec with the ALSA infrastructure. -This is done in maya44.c, mainly because some of the WM8776 controls are used in Maya44-specific ways, and should be named appropriately. - - -the following files were created in pci/ice1724, simply #including the corresponding file from the alsa-kernel tree: - -wtm.h -vt1720_mobo.h -revo.h -prodigy192.h -pontis.h -phase.h -maya44.h -juli.h -aureon.h -amp.h -envy24ht.h -se.h -prodigy_hifi.h - - -*I hope this is the correct way to do things.* - - -SAMPLING RATES: - -The Maya44 card (or more exactly, the Wolfson WM8776 codecs) allow a maximum sampling rate of 192 kHz for playback and 92 kHz for capture. - -As the ICE1724 chip only allows one global sampling rate, this is handled as follows: - -* setting the sampling rate on any open PCM device on the maya44 card will always set the *global* sampling rate for all playback and capture channels. - -* In the current state of the driver, setting rates of up to 192 kHz is permitted even for capture devices. - -*AVOID CAPTURING AT RATES ABOVE 96kHz*, even though it may appear to work. The codec cannot actually capture at such rates, meaning poor quality. - - -I propose some additional code for limiting the sampling rate when setting on a capture pcm device. However because of the global sampling rate, this logic would be somewhat problematic. - -The proposed code (currently deactivated) is in ice1712.h.patch, ice1724.c and maya44.c (in pci/ice1712). - - -SOUND DEVICES: - -PCM devices correspond to inputs/outputs as follows (assuming Maya44 is card #0): - -hw:0,0 input - stereo, analog input 1+2 -hw:0,0 output - stereo, analog output 1+2 -hw:0,1 input - stereo, analog input 3+4 OR S/PDIF input -hw:0,1 output - stereo, analog output 3+4 (and SPDIF out) - - -NAMING OF MIXER CONTROLS: - -(for more information about the signal flow, please refer to the block diagram on p.24 of the ESI Maya44 manual, or in the ESI windows software). - - -PCM: (digital) output level for channel 1+2 -PCM 1: same for channel 3+4 - -Mic Phantom+48V: switch for +48V phantom power for electrostatic microphones on input 1/2. - Make sure this is not turned on while any other source is connected to input 1/2. - It might damage the source and/or the maya44 card. - -Mic/Line input: if switch is on, input jack 1/2 is microphone input (mono), otherwise line input (stereo). - -Bypass: analogue bypass from ADC input to output for channel 1+2. Same as "Monitor" in the windows driver. -Bypass 1: same for channel 3+4. - -Crossmix: cross-mixer from channels 1+2 to channels 3+4 -Crossmix 1: cross-mixer from channels 3+4 to channels 1+2 - -IEC958 Output: switch for S/PDIF output. - This is not supported by the ESI windows driver. - S/PDIF should output the same signal as channel 3+4. [untested!] - - -Digitial output selectors: - - These switches allow a direct digital routing from the ADCs to the DACs. - Each switch determines where the digital input data to one of the DACs comes from. - They are not supported by the ESI windows driver. - For normal operation, they should all be set to "PCM out". - -H/W: Output source channel 1 -H/W 1: Output source channel 2 -H/W 2: Output source channel 3 -H/W 3: Output source channel 4 - -H/W 4 ... H/W 9: unknown function, left in to enable testing. - Possibly some of these control S/PDIF output(s). - If these turn out to be unused, they will go away in later driver versions. - -Selectable values for each of the digital output selectors are: - "PCM out" -> DAC output of the corresponding channel (default setting) - "Input 1"... - "Input 4" -> direct routing from ADC output of the selected input channel - - --------- - -Feb 14, 2008 -Rainer Zimmermann -mail@lightshed.de - |