[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>

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)

Documentation/sound/alsa/CMIPCI.txt

-              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
 ------------------

sound/pci/Kconfig

@@ -170,14 +170,14 @@ config SND_CA0106
 	  will be called snd-ca0106.
 
 config SND_CMIPCI
-	tristate "C-Media 8738, 8338"
+	tristate "C-Media 8338, 8738, 8768, 8770"
 	depends on SND
 	select SND_OPL3_LIB
 	select SND_MPU401_UART
 	select SND_PCM
 	help
-	  If you want to use soundcards based on C-Media CMI8338 or CMI8738
-	  chips, say Y here and read
+	  If you want to use soundcards based on C-Media CMI8338, CMI8738,
+	  CMI8768 or CMI8770 chips, say Y here and read
 	  <file:Documentation/sound/alsa/CMIPCI.txt>.
 
 	  To compile this driver as a module, choose M here: the module

sound/pci/cmipci.c

@@ -2774,10 +2774,14 @@ static int __devinit snd_cmipci_create_fm(struct cmipci *cm, long fm_port)
 	if (!fm_port)
 		goto disable_fm;
 
-	/* first try FM regs in PCI port range */
-	iosynth = cm->iobase + CM_REG_FM_PCI;
-	err = snd_opl3_create(cm->card, iosynth, iosynth + 2,
-			      OPL3_HW_OPL3, 1, &opl3);
+	if (cm->chip_version > 33) {
+		/* first try FM regs in PCI port range */
+		iosynth = cm->iobase + CM_REG_FM_PCI;
+		err = snd_opl3_create(cm->card, iosynth, iosynth + 2,
+				      OPL3_HW_OPL3, 1, &opl3);
+	} else {
+		err = -EIO;
+	}
 	if (err < 0) {
 		/* then try legacy ports */
 		val = snd_cmipci_read(cm, CM_REG_LEGACY_CTRL) & ~CM_FMSEL_MASK;
@@ -2935,7 +2939,8 @@ static int __devinit snd_cmipci_create(struct snd_card *card, struct pci_dev *pc
 		return err;
 	}
 
-	integrated_midi = snd_cmipci_read_b(cm, CM_REG_MPU_PCI) != 0xff;
+	integrated_midi = cm->chip_version > 33 &&
+		snd_cmipci_read_b(cm, CM_REG_MPU_PCI + 1) != 0xff;
 	if (integrated_midi && mpu_port[dev] == 1)
 		iomidi = cm->iobase + CM_REG_MPU_PCI;
 	else {
@@ -2955,8 +2960,11 @@ static int __devinit snd_cmipci_create(struct snd_card *card, struct pci_dev *pc
 		}
 	}
 
-	if ((err = snd_cmipci_create_fm(cm, fm_port[dev])) < 0)
-		return err;
+	if (cm->chip_version < 68) {
+		err = snd_cmipci_create_fm(cm, fm_port[dev]);
+		if (err < 0)
+			return err;
+	}
 
 	/* reset mixer */
 	snd_cmipci_mixer_write(cm, 0, 0);