sound/alsa/CMIPCI.txt

1          Brief Notes on C-Media 8338/8738/8768/8770 Driver
7 Front/Rear Multi-channel Playback
8 ---------------------------------
12 DACs, both streams are handled independently unlike the 4/6ch multi-
21 - The first DAC supports U8 and S16LE formats, while the second DAC
23 - The second DAC supports only two channel stereo.
49 control switch in the driver "Line-In As Rear", which you can change
50 via alsamixer or somewhat else.  When this switch is on, line-in jack
58 4/6 Multi-Channel Playback
59 --------------------------
61 The recent CM8738 chips support for the 4/6 multi-channel playback
64 When the multi-channel is supported, the driver name has a suffix
65 "-MC" such like "CMI8738-MC6".  You can check this name from
68 When the 4/6-ch output is enabled, the second DAC accepts up to 6 (or
70 formats, the 4/6-ch playback supports only the same condition for all
71 channels.  Since the multi-channel playback mode uses both DACs, you
72 cannot operate with full-duplex.
75 in alsa-lib.  For example, you can play a WAV file with 6 channels like
77 	% aplay -Dsurround51 sixchannels.wav
92 "Line-In Mode"	- an enum control to change the behavior of line-in
93 	jack.  Either "Line-In", "Rear Output" or "Bass Output" can
97 	are output to line-in jack.
98 "Mic-In Mode"	- an enum control to change the behavior of mic-in
99 	jack.  Either "Mic-In" or "Center/LFE Output" can be
102 	channels (channels 5 and 6) are output to mic-in jack.
105 -----------
115 	% aplay -Dhw:0,2 foo.wav
119 	% aplay -Dspdif foo.wav
129 so-called S/PDIF).  Then you'll see the red light on from the card so
132 from line-out with "IEC958 In Monitor" switch at any time (see
143 "IEC958 Mix Analog" - Mix analog PCM playback and FM-OPL/3 streams and
150 "IEC958 In Select"  - Select SPDIF input, the internal CD-in (false)
153 "IEC958 Loop"       - SPDIF input data is loop back into SPDIF
156 "IEC958 Copyright"  - Set the copyright bit.
158 "IEC958 5V"         - Select 0.5V (coax) or 5V (optical) interface.
160 	configuration with hardware dip-switch.
162 "IEC958 In Monitor" - SPDIF input is routed to DAC.
164 "IEC958 In Phase Inverse" - Set SPDIF input format as inverse.
167 "IEC958 In Valid"   - Set input validity flag detection.
170 stream through analog line-out.
174 ----------------------------
178 access it via alsa-lib.  See alsa-lib documents for more details.
181 turned off so that non-audio data is heard from the analog line-out.
187 the alsa-lib.  If you need to bypass the software conversion of IEC958
193 ----------------------
196 There are Master, PCM, Synth, CD, Line, Mic and PC Speaker playback
197 volumes.  Synth, CD, Line and Mic have playback and capture switches,
201 - PCM playback switch
202 - PCM capture switch (to capture the data sent to DAC)
203 - Mic Boost switch
204 - Mic capture volume
205 - Aux playback volume/switch and capture switch
206 - 3D control switch
210 ---------------
212 With CMI8338 chips, the MPU401-UART interface is disabled as default.
228 --------------
240 ------------------
243 joystick_port=1 module option.  The value 1 means the auto-detection.
244 If the auto-detection fails, try to pass the exact I/O address.
250 ---------------------