ALSA: cs5535audio: Allocate resources with device-managed APIs

This patch converts the resource management in PCI cs5535audio 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. A slight uncertain change is the call of
olpc_quirks_cleanup() at removal: formerly this was called
unconditionally at remove, but this should be a conditionally call,
hence the machine_is_olpc() check is added here as well.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/pci/cs5535audio/cs5535audio.c

···
 	return IRQ_HANDLED;
 }
 
-static int snd_cs5535audio_free(struct cs5535audio *cs5535au)
+static void snd_cs5535audio_free(struct snd_card *card)
 {
-	pci_set_power_state(cs5535au->pci, PCI_D3hot);
-
-	if (cs5535au->irq >= 0)
-		free_irq(cs5535au->irq, cs5535au);
-
-	pci_release_regions(cs5535au->pci);
-	pci_disable_device(cs5535au->pci);
-	kfree(cs5535au);
-	return 0;
-}
-
-static int snd_cs5535audio_dev_free(struct snd_device *device)
-{
-	struct cs5535audio *cs5535au = device->device_data;
-	return snd_cs5535audio_free(cs5535au);
+	olpc_quirks_cleanup();
 }
 
 static int snd_cs5535audio_create(struct snd_card *card,
-				  struct pci_dev *pci,
-				  struct cs5535audio **rcs5535au)
+				  struct pci_dev *pci)
 {
-	struct cs5535audio *cs5535au;
-
+	struct cs5535audio *cs5535au = card->private_data;
 	int err;
-	static const struct snd_device_ops ops = {
-		.dev_free =	snd_cs5535audio_dev_free,
-	};
 
-	*rcs5535au = NULL;
-	err = pci_enable_device(pci);
+	err = pcim_enable_device(pci);
 	if (err < 0)
 		return err;
 
 	if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(32))) {
 		dev_warn(card->dev, "unable to get 32bit dma\n");
-		err = -ENXIO;
-		goto pcifail;
-	}
-
-	cs5535au = kzalloc(sizeof(*cs5535au), GFP_KERNEL);
-	if (cs5535au == NULL) {
-		err = -ENOMEM;
-		goto pcifail;
+		return -ENXIO;
 	}
 
 	spin_lock_init(&cs5535au->reg_lock);
···
 	cs5535au->irq = -1;
 
 	err = pci_request_regions(pci, "CS5535 Audio");
-	if (err < 0) {
-		kfree(cs5535au);
-		goto pcifail;
-	}
+	if (err < 0)
+		return err;
 
 	cs5535au->port = pci_resource_start(pci, 0);
 
-	if (request_irq(pci->irq, snd_cs5535audio_interrupt,
-			IRQF_SHARED, KBUILD_MODNAME, cs5535au)) {
+	if (devm_request_irq(&pci->dev, pci->irq, snd_cs5535audio_interrupt,
+			     IRQF_SHARED, KBUILD_MODNAME, cs5535au)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		err = -EBUSY;
-		goto sndfail;
+		return -EBUSY;
 	}
 
 	cs5535au->irq = pci->irq;
 	card->sync_irq = cs5535au->irq;
 	pci_set_master(pci);
 
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, cs5535au, &ops);
-	if (err < 0)
-		goto sndfail;
-
-	*rcs5535au = cs5535au;
 	return 0;
-
-sndfail: /* leave the device alive, just kill the snd */
-	snd_cs5535audio_free(cs5535au);
-	return err;
-
-pcifail:
-	pci_disable_device(pci);
-	return err;
 }
 
 static int snd_cs5535audio_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(*cs5535au), &card);
+	if (err < 0)
+		return err;
+	cs5535au = card->private_data;
+	card->private_free = snd_cs5535audio_free;
+
+	err = snd_cs5535audio_create(card, pci);
 	if (err < 0)
 		return err;
 
-	err = snd_cs5535audio_create(card, pci, &cs5535au);
-	if (err < 0)
-		goto probefail_out;
-
-	card->private_data = cs5535au;
-
 	err = snd_cs5535audio_mixer(cs5535au);
 	if (err < 0)
-		goto probefail_out;
+		return err;
 
 	err = snd_cs5535audio_pcm(cs5535au);
 	if (err < 0)
-		goto probefail_out;
+		return err;
 
 	strcpy(card->driver, DRIVER_NAME);
 
···
 
 	err = snd_card_register(card);
 	if (err < 0)
-		goto probefail_out;
+		return err;
 
 	pci_set_drvdata(pci, card);
 	dev++;
 	return 0;
-
-probefail_out:
-	snd_card_free(card);
-	return err;
-}
-
-static void snd_cs5535audio_remove(struct pci_dev *pci)
-{
-	olpc_quirks_cleanup();
-	snd_card_free(pci_get_drvdata(pci));
 }
 
 static struct pci_driver cs5535audio_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_cs5535audio_ids,
 	.probe = snd_cs5535audio_probe,
-	.remove = snd_cs5535audio_remove,
 #ifdef CONFIG_PM_SLEEP
 	.driver = {
 		.pm = &snd_cs5535audio_pm,

sound/pci/cs5535audio/cs5535audio_olpc.c

···
 	for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
 		err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
 				ac97->private_data));
-		if (err < 0) {
-			gpio_free(OLPC_GPIO_MIC_AC);
+		if (err < 0)
 			return err;
-		}
 	}
 
 	/* turn off the mic by default */
···
 
 void olpc_quirks_cleanup(void)
 {
-	gpio_free(OLPC_GPIO_MIC_AC);
+	if (machine_is_olpc())
+		gpio_free(OLPC_GPIO_MIC_AC);
 }