[ALSA] cmipci - Allow to disable integrated FM port

The driver didn't allow to disable the integrated FM port (if available),
and this annoyed people who don't want FM port.  Now fm_port=0 disables
the FM port unconditionally.  fm_port=1 is used for enabling the integrated
FM port (as default).
Also fixed the documentation about this option.
Fix ALSA bug#2491.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -370,7 +370,9 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     mpu_port	- 0x300,0x310,0x320,0x330 = legacy port,
 		  1 = integrated PCI port,
 		  0 = disable (default)
-    fm_port     - 0x388 (default), 0 = disable (default)
+    fm_port     - 0x388 = legacy port,
+		  1 = integrated PCI port (default),
+		  0 = disable
     soft_ac3    - Software-conversion of raw SPDIF packets (model 033 only)
                   (default = 1)
     joystick_port - Joystick port address (0 = disable, 1 = auto-detect)

sound/pci/cmipci.c

@@ -57,7 +57,7 @@ static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable switches */
 static long mpu_port[SNDRV_CARDS];
-static long fm_port[SNDRV_CARDS];
+static long fm_port[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)]=1};
 static int soft_ac3[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)]=1};
 #ifdef SUPPORT_JOYSTICK
 static int joystick_port[SNDRV_CARDS];
@@ -2779,6 +2779,9 @@ static int __devinit snd_cmipci_create_fm(struct cmipci *cm, long fm_port)
 	struct snd_opl3 *opl3;
 	int err;
 
+	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,
@@ -2793,7 +2796,7 @@ static int __devinit snd_cmipci_create_fm(struct cmipci *cm, long fm_port)
 		case 0x3C8: val |= CM_FMSEL_3C8; break;
 		case 0x388: val |= CM_FMSEL_388; break;
 		default:
-			    return 0;
+			goto disable_fm;
 		}
 		snd_cmipci_write(cm, CM_REG_LEGACY_CTRL, val);
 		/* enable FM */
@@ -2803,11 +2806,7 @@ static int __devinit snd_cmipci_create_fm(struct cmipci *cm, long fm_port)
 				    OPL3_HW_OPL3, 0, &opl3) < 0) {
 			printk(KERN_ERR "cmipci: no OPL device at %#lx, "
 			       "skipping...\n", iosynth);
-			/* disable FM */
-			snd_cmipci_write(cm, CM_REG_LEGACY_CTRL,
-					 val & ~CM_FMSEL_MASK);
-			snd_cmipci_clear_bit(cm, CM_REG_MISC_CTRL, CM_FM_EN);
-			return 0;
+			goto disable_fm;
 		}
 	}
 	if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
@@ -2815,6 +2814,11 @@ static int __devinit snd_cmipci_create_fm(struct cmipci *cm, long fm_port)
 		return err;
 	}
 	return 0;
+
+ disable_fm:
+	snd_cmipci_clear_bit(cm, CM_REG_LEGACY_CTRL, CM_FMSEL_MASK);
+	snd_cmipci_clear_bit(cm, CM_REG_MISC_CTRL, CM_FM_EN);
+	return 0;
 }
 
 static int __devinit snd_cmipci_create(struct snd_card *card, struct pci_dev *pci,