ALSA: cs4281: Allocate resources with device-managed APIs

This patch converts the resource management in PCI cs4281 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/20210715075941.23332-15-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/cs4281.c

@@ -1268,8 +1268,10 @@ static inline int snd_cs4281_create_gameport(struct cs4281 *chip) { return -ENOS
 static inline void snd_cs4281_free_gameport(struct cs4281 *chip) { }
 #endif /* IS_REACHABLE(CONFIG_GAMEPORT) */
 
-static int snd_cs4281_free(struct cs4281 *chip)
+static void snd_cs4281_free(struct snd_card *card)
 {
+	struct cs4281 *chip = card->private_data;
+
 	snd_cs4281_free_gameport(chip);
 
 	/* Mask interrupts */
@@ -1278,49 +1280,20 @@ static int snd_cs4281_free(struct cs4281 *chip)
 	snd_cs4281_pokeBA0(chip, BA0_CLKCR1, 0);
 	/* Sound System Power Management - Turn Everything OFF */
 	snd_cs4281_pokeBA0(chip, BA0_SSPM, 0);
-	/* PCI interface - D3 state */
-	pci_set_power_state(chip->pci, PCI_D3hot);
-
-	if (chip->irq >= 0)
-		free_irq(chip->irq, chip);
-	iounmap(chip->ba0);
-	iounmap(chip->ba1);
-	pci_release_regions(chip->pci);
-	pci_disable_device(chip->pci);
-
-	kfree(chip);
-	return 0;
-}
-
-static int snd_cs4281_dev_free(struct snd_device *device)
-{
-	struct cs4281 *chip = device->device_data;
-	return snd_cs4281_free(chip);
 }
 
 static int snd_cs4281_chip_init(struct cs4281 *chip); /* defined below */
 
 static int snd_cs4281_create(struct snd_card *card,
 			     struct pci_dev *pci,
-			     struct cs4281 **rchip,
 			     int dual_codec)
 {
 	struct cs4281 *chip;
-	unsigned int tmp;
 	int err;
-	static const struct snd_device_ops ops = {
-		.dev_free =	snd_cs4281_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 == NULL) {
-		pci_disable_device(pci);
-		return -ENOMEM;
-	}
 	spin_lock_init(&chip->reg_lock);
 	chip->card = card;
 	chip->pci = pci;
@@ -1332,46 +1305,29 @@ static int snd_cs4281_create(struct snd_card *card,
 	}
 	chip->dual_codec = dual_codec;
 
-	err = pci_request_regions(pci, "CS4281");
-	if (err < 0) {
-		kfree(chip);
-		pci_disable_device(pci);
+	err = pcim_iomap_regions(pci, 0x03, "CS4281"); /* 2 BARs */
+	if (err < 0)
 		return err;
-	}
 	chip->ba0_addr = pci_resource_start(pci, 0);
 	chip->ba1_addr = pci_resource_start(pci, 1);
 
-	chip->ba0 = pci_ioremap_bar(pci, 0);
-	chip->ba1 = pci_ioremap_bar(pci, 1);
-	if (!chip->ba0 || !chip->ba1) {
-		snd_cs4281_free(chip);
-		return -ENOMEM;
-	}
+	chip->ba0 = pcim_iomap_table(pci)[0];
+	chip->ba1 = pcim_iomap_table(pci)[1];
 	
-	if (request_irq(pci->irq, snd_cs4281_interrupt, IRQF_SHARED,
-			KBUILD_MODNAME, chip)) {
+	if (devm_request_irq(&pci->dev, pci->irq, snd_cs4281_interrupt,
+			     IRQF_SHARED, KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		snd_cs4281_free(chip);
 		return -ENOMEM;
 	}
 	chip->irq = pci->irq;
 	card->sync_irq = chip->irq;
+	card->private_free = snd_cs4281_free;
 
-	tmp = snd_cs4281_chip_init(chip);
-	if (tmp) {
-		snd_cs4281_free(chip);
-		return tmp;
-	}
-
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_cs4281_free(chip);
+	err = snd_cs4281_chip_init(chip);
+	if (err)
 		return err;
-	}
 
 	snd_cs4281_proc_init(chip);
-
-	*rchip = chip;
 	return 0;
 }
 
@@ -1887,46 +1843,34 @@ static int snd_cs4281_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_cs4281_create(card, pci, &chip, dual_codec[dev]);
-	if (err < 0) {
-		snd_card_free(card);
+	err = snd_cs4281_create(card, pci, dual_codec[dev]);
+	if (err < 0)
 		return err;
-	}
-	card->private_data = chip;
 
 	err = snd_cs4281_mixer(chip);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
 	err = snd_cs4281_pcm(chip, 0);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
 	err = snd_cs4281_midi(chip, 0);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
 	err = snd_opl3_new(card, OPL3_HW_OPL3_CS4281, &opl3);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
 	opl3->private_data = chip;
 	opl3->command = snd_cs4281_opl3_command;
 	snd_opl3_init(opl3);
 	err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
 	snd_cs4281_create_gameport(chip);
 	strcpy(card->driver, "CS4281");
 	strcpy(card->shortname, "Cirrus Logic CS4281");
@@ -1936,21 +1880,14 @@ static int snd_cs4281_probe(struct pci_dev *pci,
 		chip->irq);
 
 	err = snd_card_register(card);
-	if (err < 0) {
-		snd_card_free(card);
+	if (err < 0)
 		return err;
-	}
 
 	pci_set_drvdata(pci, card);
 	dev++;
 	return 0;
 }
 
-static void snd_cs4281_remove(struct pci_dev *pci)
-{
-	snd_card_free(pci_get_drvdata(pci));
-}
-
 /*
  * Power Management
  */
@@ -2054,7 +1991,6 @@ static struct pci_driver cs4281_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_cs4281_ids,
 	.probe = snd_cs4281_probe,
-	.remove = snd_cs4281_remove,
 	.driver = {
 		.pm = CS4281_PM_OPS,
 	},