[ALSA] cmipci: fix handling of FM/MIDI port addresses

Make sure that the MPU-401 MIDI and OPL-3 FM devices are used only on
those chips where they are supported, and that the correct port
addresses are used.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

2 files changed, 14 insertions, 8 deletions

diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 3df33ea8bae6..85b40057716d 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -365,13 +365,15 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
   Module snd-cmipci
   -----------------
 
-    Module for C-Media CMI8338 and 8738 PCI sound cards.
+    Module for C-Media CMI8338/8738/8768/8770 PCI sound cards.
 
-    mpu_port    - 0x300,0x310,0x320,0x330 = legacy port,
-                  1 = integrated PCI port,
+    mpu_port    - port address of MIDI interface:
+                  0x300,0x310,0x320,0x330 = legacy port,
+                  1 = integrated PCI port (8738 or later),
                   0 = disable (default)
-    fm_port     - 0x388 = legacy port,
-                  1 = integrated PCI port (default),
+    fm_port     - port address of OPL-3 FM synthesizer (8x38 only):
+                  0x388 = legacy port,
+                  1 = integrated PCI port (default on 8738),
                   0 = disable
     soft_ac3    - Software-conversion of raw SPDIF packets (model 033 only)
                   (default = 1)
diff --git a/Documentation/sound/alsa/CMIPCI.txt b/Documentation/sound/alsa/CMIPCI.txt
index 4b2b15387056..664be46566b8 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>
 
@@ -212,7 +212,9 @@ 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.
+Choose the value which doesn't conflict with other cards.  With
+CMI8738 and newer chips, you can use "mpu_port=1" to use a PCI port
+address that does not conflict with any other card.
 
 There is _no_ hardware wavetable function on this chip (except for
 OPL3 synth below).
@@ -230,6 +232,8 @@ 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
 ------------------