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-rw-r--r--Documentation/sound/alsa/CMIPCI.txt17
1 files changed, 11 insertions, 6 deletions
diff --git a/Documentation/sound/alsa/CMIPCI.txt b/Documentation/sound/alsa/CMIPCI.txt
index 4b2b15387056..16935c8561f7 100644
--- a/Documentation/sound/alsa/CMIPCI.txt
+++ b/Documentation/sound/alsa/CMIPCI.txt
@@ -1,5 +1,5 @@
- Brief Notes on C-Media 8738/8338 Driver
- =======================================
+ Brief Notes on C-Media 8338/8738/8768/8770 Driver
+ =================================================
Takashi Iwai <tiwai@suse.de>
@@ -209,10 +209,13 @@ In addition to the standard SB mixer, CM8x38 provides more functions.
MIDI CONTROLLER
---------------
-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.
+With CMI8338 chips, the MPU401-UART interface is disabled as default.
+You need to set the module option "mpu_port" to a valid I/O port address
+to enable MIDI support. Valid I/O ports are 0x300, 0x310, 0x320 and
+0x330. Choose a value that doesn't conflict with other cards.
+
+With CMI8738 and newer chips, the MIDI interface is enabled by default
+and the driver automatically chooses a port address.
There is _no_ hardware wavetable function on this chip (except for
OPL3 synth below).
@@ -230,6 +233,8 @@ Set "fm_port" module option for more cards.
The output quality of FM OPL/3 is, however, very weird.
I don't know why..
+CMI8768 and newer chips do not have the FM synth.
+
Joystick and Modem
------------------