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-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 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
-