ALSA: bt87x: Allocate resources with device-managed APIs

This patch converts the resource management in PCI bt87x driver with
devres as a clean up.  Each manual resource management is converted
with the corresponding devres helper, and the card object release is
managed now via card->private_free instead of a lowlevel snd_device.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/20210715075941.23332-13-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/bt87x.c

@@ -656,23 +656,11 @@ static const struct snd_kcontrol_new snd_bt87x_capture_source = {
 	.put = snd_bt87x_capture_source_put,
 };
 
-static int snd_bt87x_free(struct snd_bt87x *chip)
+static void snd_bt87x_free(struct snd_card *card)
 {
-	if (chip->mmio)
-		snd_bt87x_stop(chip);
-	if (chip->irq >= 0)
-		free_irq(chip->irq, chip);
-	iounmap(chip->mmio);
-	pci_release_regions(chip->pci);
-	pci_disable_device(chip->pci);
-	kfree(chip);
-	return 0;
-}
+	struct snd_bt87x *chip = card->private_data;
 
-static int snd_bt87x_dev_free(struct snd_device *device)
-{
-	struct snd_bt87x *chip = device->device_data;
-	return snd_bt87x_free(chip);
+	snd_bt87x_stop(chip);
 }
 
 static int snd_bt87x_pcm(struct snd_bt87x *chip, int device, char *name)
@@ -694,43 +682,24 @@ static int snd_bt87x_pcm(struct snd_bt87x *chip, int device, char *name)
 }
 
 static int snd_bt87x_create(struct snd_card *card,
-			    struct pci_dev *pci,
-			    struct snd_bt87x **rchip)
+			    struct pci_dev *pci)
 {
-	struct snd_bt87x *chip;
+	struct snd_bt87x *chip = card->private_data;
 	int err;
-	static const struct snd_device_ops ops = {
-		.dev_free = snd_bt87x_dev_free
-	};
 
-	*rchip = NULL;
-
-	err = pci_enable_device(pci);
+	err = pcim_enable_device(pci);
 	if (err < 0)
 		return err;
 
-	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-	if (!chip) {
-		pci_disable_device(pci);
-		return -ENOMEM;
-	}
 	chip->card = card;
 	chip->pci = pci;
 	chip->irq = -1;
 	spin_lock_init(&chip->reg_lock);
 
-	err = pci_request_regions(pci, "Bt87x audio");
-	if (err < 0) {
-		kfree(chip);
-		pci_disable_device(pci);
+	err = pcim_iomap_regions(pci, 1 << 0, "Bt87x audio");
+	if (err < 0)
 		return err;
-	}
-	chip->mmio = pci_ioremap_bar(pci, 0);
-	if (!chip->mmio) {
-		dev_err(card->dev, "cannot remap io memory\n");
-		err = -ENOMEM;
-		goto fail;
-	}
+	chip->mmio = pcim_iomap_table(pci)[0];
 
 	chip->reg_control = CTL_A_PWRDN | CTL_DA_ES2 |
 			    CTL_PKTP_16 | (15 << CTL_DA_SDR_SHIFT);
@@ -739,26 +708,18 @@ static int snd_bt87x_create(struct snd_card *card,
 	snd_bt87x_writel(chip, REG_INT_MASK, 0);
 	snd_bt87x_writel(chip, REG_INT_STAT, MY_INTERRUPTS);
 
-	err = request_irq(pci->irq, snd_bt87x_interrupt, IRQF_SHARED,
-			  KBUILD_MODNAME, chip);
+	err = devm_request_irq(&pci->dev, pci->irq, snd_bt87x_interrupt,
+			       IRQF_SHARED, KBUILD_MODNAME, chip);
 	if (err < 0) {
 		dev_err(card->dev, "cannot grab irq %d\n", pci->irq);
-		goto fail;
+		return err;
 	}
 	chip->irq = pci->irq;
 	card->sync_irq = chip->irq;
+	card->private_free = snd_bt87x_free;
 	pci_set_master(pci);
 
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0)
-		goto fail;
-
-	*rchip = chip;
 	return 0;
-
-fail:
-	snd_bt87x_free(chip);
-	return err;
 }
 
 #define BT_DEVICE(chip, subvend, subdev, id) \
@@ -868,14 +829,15 @@ static int snd_bt87x_probe(struct pci_dev *pci,
 		return -ENOENT;
 	}
 
-	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
-			   0, &card);
+	err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
+				sizeof(*chip), &card);
 	if (err < 0)
 		return err;
+	chip = card->private_data;
 
-	err = snd_bt87x_create(card, pci, &chip);
+	err = snd_bt87x_create(card, pci);
 	if (err < 0)
-		goto _error;
+		return err;
 
 	memcpy(&chip->board, &snd_bt87x_boards[boardid], sizeof(chip->board));
 
@@ -887,24 +849,24 @@ static int snd_bt87x_probe(struct pci_dev *pci,
 
 		err = snd_bt87x_pcm(chip, DEVICE_DIGITAL, "Bt87x Digital");
 		if (err < 0)
-			goto _error;
+			return err;
 	}
 	if (!chip->board.no_analog) {
 		err = snd_bt87x_pcm(chip, DEVICE_ANALOG, "Bt87x Analog");
 		if (err < 0)
-			goto _error;
+			return err;
 		err = snd_ctl_add(card, snd_ctl_new1(
 				  &snd_bt87x_capture_volume, chip));
 		if (err < 0)
-			goto _error;
+			return err;
 		err = snd_ctl_add(card, snd_ctl_new1(
 				  &snd_bt87x_capture_boost, chip));
 		if (err < 0)
-			goto _error;
+			return err;
 		err = snd_ctl_add(card, snd_ctl_new1(
 				  &snd_bt87x_capture_source, chip));
 		if (err < 0)
-			goto _error;
+			return err;
 	}
 	dev_info(card->dev, "bt87x%d: Using board %d, %sanalog, %sdigital "
 		   "(rate %d Hz)\n", dev, boardid,
@@ -920,20 +882,11 @@ static int snd_bt87x_probe(struct pci_dev *pci,
 
 	err = snd_card_register(card);
 	if (err < 0)
-		goto _error;
+		return err;
 
 	pci_set_drvdata(pci, card);
 	++dev;
 	return 0;
-
-_error:
-	snd_card_free(card);
-	return err;
-}
-
-static void snd_bt87x_remove(struct pci_dev *pci)
-{
-	snd_card_free(pci_get_drvdata(pci));
 }
 
 /* default entries for all Bt87x cards - it's not exported */
@@ -948,7 +901,6 @@ static struct pci_driver driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_bt87x_ids,
 	.probe = snd_bt87x_probe,
-	.remove = snd_bt87x_remove,
 };
 
 static int __init alsa_card_bt87x_init(void)