ALSA: ymfpci: Add error messages for abritrary IO ports on older chips

As an end user, it can be confusing to request an arbitrary IO port be
used only to find out that it doesn't work without an obvious reason,
especially since /sys/module/snd_ymfpci/parameters/{fm,joystick,mpu}_port
indicate 0 after the module has been loaded.

In my case, I was unaware that the YMF724 did not support such usage, and
thus ended up spending time attempting to debug the issue.

Now, when a user attempts to request an IO port that isn't supported by
the hardware, the following message is printed:

[   25.549530] snd_ymfpci 0000:06:05.0: The Yamaha DS-1 (YMF724F) does not support arbitrary IO ports for FM (requested 0x1234)

Signed-off-by: Tasos Sahanidis <tasos@tasossah.com>
Link: https://lore.kernel.org/r/20230329034204.171901-1-tasos@tasossah.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 25 insertions, 10 deletions

diff --git a/sound/pci/ymfpci/ymfpci.c b/sound/pci/ymfpci/ymfpci.c
index 1e198e4d57b8..de5dc5337c40 100644
--- a/sound/pci/ymfpci/ymfpci.c
+++ b/sound/pci/ymfpci/ymfpci.c
@@ -98,8 +98,10 @@ static int snd_ymfpci_create_gameport(struct snd_ymfpci *chip, int dev,
 		case 0x204: legacy_ctrl2 |= 2 << 6; break;
 		case 0x205: legacy_ctrl2 |= 3 << 6; break;
 		default:
-			dev_err(chip->card->dev,
-				"invalid joystick port %#x", io_port);
+			if (io_port > 0)
+				dev_err(chip->card->dev,
+					"The %s does not support arbitrary IO ports for the game port (requested 0x%x)\n",
+					chip->card->shortname, (unsigned int)io_port);
 			return -EINVAL;
 		}
 	}
@@ -186,6 +188,13 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
 	default: model = str = "???"; break;
 	}
 
+	strcpy(card->driver, str);
+	sprintf(card->shortname, "Yamaha %s (%s)", model, str);
+	sprintf(card->longname, "%s at 0x%lx, irq %i",
+		card->shortname,
+		chip->reg_area_phys,
+		chip->irq);
+
 	legacy_ctrl = 0;
 	legacy_ctrl2 = 0x0800;	/* SBEN = 0, SMOD = 01, LAD = 0 */
 
@@ -218,7 +227,13 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
 		case 0x398: legacy_ctrl2 |= 1; break;
 		case 0x3a0: legacy_ctrl2 |= 2; break;
 		case 0x3a8: legacy_ctrl2 |= 3; break;
-		default: fm_port[dev] = 0; break;
+		default:
+			if (fm_port[dev] > 0)
+				dev_err(card->dev,
+					"The %s does not support arbitrary IO ports for FM (requested 0x%x)\n",
+					card->shortname, (unsigned int)fm_port[dev]);
+			fm_port[dev] = 0;
+			break;
 		}
 		if (fm_port[dev] > 0)
 			fm_res = devm_request_region(&pci->dev, fm_port[dev],
@@ -234,7 +249,13 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
 		case 0x300: legacy_ctrl2 |= 1 << 4; break;
 		case 0x332: legacy_ctrl2 |= 2 << 4; break;
 		case 0x334: legacy_ctrl2 |= 3 << 4; break;
-		default: mpu_port[dev] = 0; break;
+		default:
+			if (mpu_port[dev] > 0)
+				dev_err(card->dev,
+					"The %s does not support arbitrary IO ports for MPU-401 (requested 0x%x)\n",
+					card->shortname, (unsigned int)mpu_port[dev]);
+			mpu_port[dev] = 0;
+			break;
 		}
 		if (mpu_port[dev] > 0)
 			mpu_res = devm_request_region(&pci->dev, mpu_port[dev],
@@ -257,12 +278,6 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
 	if (err  < 0)
 		return err;
 
-	strcpy(card->driver, str);
-	sprintf(card->shortname, "Yamaha %s (%s)", model, str);
-	sprintf(card->longname, "%s at 0x%lx, irq %i",
-		card->shortname,
-		chip->reg_area_phys,
-		chip->irq);
 	err = snd_ymfpci_pcm(chip, 0);
 	if (err < 0)
 		return err;