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-rw-r--r--Documentation/sound/alsa/CMIPCI.txt41
1 files changed, 24 insertions, 17 deletions
diff --git a/Documentation/sound/alsa/CMIPCI.txt b/Documentation/sound/alsa/CMIPCI.txt
index 4a7df771b80..1872e24442a 100644
--- a/Documentation/sound/alsa/CMIPCI.txt
+++ b/Documentation/sound/alsa/CMIPCI.txt
@@ -89,19 +89,22 @@ and use the interleaved 4 channel data.
There are some control switchs affecting to the speaker connections:
-"Line-In As Rear" - As mentioned above, the line-in jack is used
- for the rear (3th and 4th channels) output.
-"Line-In As Bass" - The line-in jack is used for the bass (5th
- and 6th channels) output.
-"Mic As Center/LFE" - The mic jack is used for the bass output.
- If this switch is on, you cannot use a microphone as a capture
- source, of course.
-
+"Line-In Mode" - an enum control to change the behavior of line-in
+ jack. Either "Line-In", "Rear Output" or "Bass Output" can
+ be selected. The last item is available only with model 039
+ or newer.
+ When "Rear Output" is chosen, the surround channels 3 and 4
+ are output to line-in jack.
+"Mic-In Mode" - an enum control to change the behavior of mic-in
+ jack. Either "Mic-In" or "Center/LFE Output" can be
+ selected.
+ When "Center/LFE Output" is chosen, the center and bass
+ channels (channels 5 and 6) are output to mic-in jack.
Digital I/O
-----------
-The CM8x38 provides the excellent SPDIF capability with very chip
+The CM8x38 provides the excellent SPDIF capability with very cheap
price (yes, that's the reason I bought the card :)
The SPDIF playback and capture are done via the third PCM device
@@ -122,8 +125,9 @@ respectively, so you cannot playback both analog and digital streams
simultaneously.
To enable SPDIF output, you need to turn on "IEC958 Output Switch"
-control via mixer or alsactl. Then you'll see the red light on from
-the card so you know that's working obviously :)
+control via mixer or alsactl ("IEC958" is the official name of
+so-called S/PDIF). Then you'll see the red light on from the card so
+you know that's working obviously :)
The SPDIF input is always enabled, so you can hear SPDIF input data
from line-out with "IEC958 In Monitor" switch at any time (see
below).
@@ -205,9 +209,10 @@ In addition to the standard SB mixer, CM8x38 provides more functions.
MIDI CONTROLLER
---------------
-The MPU401-UART interface is enabled as default only for the first
-(CMIPCI) card. You need to set module option "midi_port" properly
-for the 2nd (CMIPCI) card.
+The MPU401-UART interface is disabled as default. You need to set
+module option "mpu_port" with a valid I/O port address to enable the
+MIDI support. The valid I/O ports are 0x300, 0x310, 0x320 and 0x330.
+Choose the value which doesn't conflict with other cards.
There is _no_ hardware wavetable function on this chip (except for
OPL3 synth below).
@@ -229,9 +234,11 @@ I don't know why..
Joystick and Modem
------------------
-The joystick and modem should be available by enabling the control
-switch "Joystick" and "Modem" respectively. But I myself have never
-tested them yet.
+The legacy joystick is supported. To enable the joystick support, pass
+joystick_port=1 module option. The value 1 means the auto-detection.
+If the auto-detection fails, try to pass the exact I/O address.
+
+The modem is enabled dynamically via a card control switch "Modem".
Debugging Information