164 строки
5.7 KiB
Plaintext
164 строки
5.7 KiB
Plaintext
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
|
|
|