ALSA: aw2: Allocate resources with device-managed APIs

This patch converts the resource management in PCI aw2 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/20210715075941.23332-29-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/aw2/aw2-alsa.c

@@ -99,12 +99,9 @@ struct aw2 {
 /*********************************
  * FUNCTION DECLARATIONS
  ********************************/
-static int snd_aw2_dev_free(struct snd_device *device);
+static int snd_aw2_create(struct snd_card *card, struct pci_dev *pci);
-static int snd_aw2_create(struct snd_card *card,
-			  struct pci_dev *pci, struct aw2 **rchip);
 static int snd_aw2_probe(struct pci_dev *pci,
 			 const struct pci_device_id *pci_id);
-static void snd_aw2_remove(struct pci_dev *pci);
 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
@@ -157,7 +154,6 @@ static struct pci_driver aw2_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_aw2_ids,
 	.probe = snd_aw2_probe,
-	.remove = snd_aw2_remove,
 };
 
 module_pci_driver(aw2_driver);
@@ -196,41 +192,23 @@ static const struct snd_kcontrol_new aw2_control = {
  ********************************/
 
 /* component-destructor */
-static int snd_aw2_dev_free(struct snd_device *device)
+static void snd_aw2_free(struct snd_card *card)
 {
-	struct aw2 *chip = device->device_data;
+	struct aw2 *chip = card->private_data;
 
 	/* Free hardware */
 	snd_aw2_saa7146_free(&chip->saa7146);
-
-	/* release the irq */
-	if (chip->irq >= 0)
-		free_irq(chip->irq, (void *)chip);
-	/* release the i/o ports & memory */
-	iounmap(chip->iobase_virt);
-	pci_release_regions(chip->pci);
-	/* disable the PCI entry */
-	pci_disable_device(chip->pci);
-	/* release the data */
-	kfree(chip);
-
-	return 0;
 }
 
 /* chip-specific constructor */
 static int snd_aw2_create(struct snd_card *card,
-			  struct pci_dev *pci, struct aw2 **rchip)
+			  struct pci_dev *pci)
 {
-	struct aw2 *chip;
+	struct aw2 *chip = card->private_data;
 	int err;
-	static const struct snd_device_ops ops = {
-		.dev_free = snd_aw2_dev_free,
-	};
-
-	*rchip = NULL;
 
 	/* initialize the PCI entry */
-	err = pci_enable_device(pci);
+	err = pcim_enable_device(pci);
 	if (err < 0)
 		return err;
 	pci_set_master(pci);
@@ -238,14 +216,8 @@ static int snd_aw2_create(struct snd_card *card,
 	/* check PCI availability (32bit DMA) */
 	if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(32))) {
 		dev_err(card->dev, "Impossible to set 32bit mask DMA\n");
-		pci_disable_device(pci);
 		return -ENXIO;
 	}
-	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-	if (chip == NULL) {
-		pci_disable_device(pci);
-		return -ENOMEM;
-	}
 
 	/* initialize the stuff */
 	chip->card = card;
@@ -253,52 +225,23 @@ static int snd_aw2_create(struct snd_card *card,
 	chip->irq = -1;
 
 	/* (1) PCI resource allocation */
-	err = pci_request_regions(pci, "Audiowerk2");
+	err = pcim_iomap_regions(pci, 1 << 0, "Audiowerk2");
-	if (err < 0) {
+	if (err < 0)
-		pci_disable_device(pci);
-		kfree(chip);
 		return err;
-	}
 	chip->iobase_phys = pci_resource_start(pci, 0);
-	chip->iobase_virt =
+	chip->iobase_virt = pcim_iomap_table(pci)[0];
-		ioremap(chip->iobase_phys,
-				pci_resource_len(pci, 0));
-
-	if (chip->iobase_virt == NULL) {
-		dev_err(card->dev, "unable to remap memory region");
-		pci_release_regions(pci);
-		pci_disable_device(pci);
-		kfree(chip);
-		return -ENOMEM;
-	}
 
 	/* (2) initialization of the chip hardware */
 	snd_aw2_saa7146_setup(&chip->saa7146, chip->iobase_virt);
 
-	if (request_irq(pci->irq, snd_aw2_saa7146_interrupt,
+	if (devm_request_irq(&pci->dev, pci->irq, snd_aw2_saa7146_interrupt,
-			IRQF_SHARED, KBUILD_MODNAME, chip)) {
+			     IRQF_SHARED, KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "Cannot grab irq %d\n", pci->irq);
-
-		iounmap(chip->iobase_virt);
-		pci_release_regions(chip->pci);
-		pci_disable_device(chip->pci);
-		kfree(chip);
 		return -EBUSY;
 	}
 	chip->irq = pci->irq;
 	card->sync_irq = chip->irq;
-
+	card->private_free = snd_aw2_free;
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		free_irq(chip->irq, (void *)chip);
-		iounmap(chip->iobase_virt);
-		pci_release_regions(chip->pci);
-		pci_disable_device(chip->pci);
-		kfree(chip);
-		return err;
-	}
-
-	*rchip = chip;
 
 	dev_info(card->dev,
 		 "Audiowerk 2 sound card (saa7146 chipset) detected and managed\n");
@@ -323,17 +266,16 @@ static int snd_aw2_probe(struct pci_dev *pci,
 	}
 
 	/* (2) Create card instance */
-	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
+	err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
-			   0, &card);
+				sizeof(*chip), &card);
 	if (err < 0)
 		return err;
+	chip = card->private_data;
 
 	/* (3) Create main component */
-	err = snd_aw2_create(card, pci, &chip);
+	err = snd_aw2_create(card, pci);
-	if (err < 0) {
+	if (err < 0)
-		snd_card_free(card);
 		return err;
-	}
 
 	/* initialize mutex */
 	mutex_init(&chip->mtx);
@@ -351,10 +293,8 @@ static int snd_aw2_probe(struct pci_dev *pci,
 
 	/* (6) Register card instance */
 	err = snd_card_register(card);
-	if (err < 0) {
+	if (err < 0)
-		snd_card_free(card);
 		return err;
-	}
 
 	/* (7) Set PCI driver data */
 	pci_set_drvdata(pci, card);
@@ -363,12 +303,6 @@ static int snd_aw2_probe(struct pci_dev *pci,
 	return 0;
 }
 
-/* destructor */
-static void snd_aw2_remove(struct pci_dev *pci)
-{
-	snd_card_free(pci_get_drvdata(pci));
-}
-
 /* open callback */
 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
 {