ALSA: es1688: Allocate resources with device-managed APIs

This patch converts the resource management in ISA es1688 driver with
devres as a clean up.  Each manual resource management is converted
with the corresponding devres helper.  The remove callback became
superfluous and dropped.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/20210715075941.23332-63-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/es1688.h

@@ -18,7 +18,6 @@
 
 struct snd_es1688 {
 	unsigned long port;		/* port of ESS chip */
-	struct resource *res_port;
 	unsigned long mpu_port;		/* MPU-401 port of ESS chip */
 	int irq;			/* IRQ number of ESS chip */
 	int mpu_irq;			/* MPU IRQ */

sound/isa/es1688/es1688.c

@@ -166,36 +166,27 @@ static int snd_es1688_isa_probe(struct device *dev, unsigned int n)
 	struct snd_card *card;
 	int error;
 
-	error = snd_card_new(dev, index[n], id[n], THIS_MODULE,
+	error = snd_devm_card_new(dev, index[n], id[n], THIS_MODULE,
-			     sizeof(struct snd_es1688), &card);
+				  sizeof(struct snd_es1688), &card);
 	if (error < 0)
 		return error;
 
 	error = snd_es1688_legacy_create(card, dev, n);
 	if (error < 0)
-		goto out;
+		return error;
 
 	error = snd_es1688_probe(card, n);
 	if (error < 0)
-		goto out;
+		return error;
 
 	dev_set_drvdata(dev, card);
 
 	return 0;
-out:
-	snd_card_free(card);
-	return error;
-}
-
-static void snd_es1688_isa_remove(struct device *dev, unsigned int n)
-{
-	snd_card_free(dev_get_drvdata(dev));
 }
 
 static struct isa_driver snd_es1688_driver = {
 	.match		= snd_es1688_match,
 	.probe		= snd_es1688_isa_probe,
-	.remove		= snd_es1688_isa_remove,
 #if 0	/* FIXME */
 	.suspend	= snd_es1688_suspend,
 	.resume		= snd_es1688_resume,
@@ -249,22 +240,18 @@ static int snd_es968_pnp_detect(struct pnp_card_link *pcard,
 	if (dev == SNDRV_CARDS)
 		return -ENODEV;
 
-	error = snd_card_new(&pcard->card->dev,
+	error = snd_devm_card_new(&pcard->card->dev,
-			     index[dev], id[dev], THIS_MODULE,
+				  index[dev], id[dev], THIS_MODULE,
-			     sizeof(struct snd_es1688), &card);
+				  sizeof(struct snd_es1688), &card);
 	if (error < 0)
 		return error;
 
 	error = snd_card_es968_pnp(card, dev, pcard, pid);
-	if (error < 0) {
+	if (error < 0)
-		snd_card_free(card);
 		return error;
-	}
 	error = snd_es1688_probe(card, dev);
-	if (error < 0) {
+	if (error < 0)
-		snd_card_free(card);
 		return error;
-	}
 	pnp_set_card_drvdata(pcard, card);
 	snd_es968_pnp_is_probed = 1;
 	return 0;
@@ -272,8 +259,6 @@ static int snd_es968_pnp_detect(struct pnp_card_link *pcard,
 
 static void snd_es968_pnp_remove(struct pnp_card_link *pcard)
 {
-	snd_card_free(pnp_get_card_drvdata(pcard));
-	pnp_set_card_drvdata(pcard, NULL);
 	snd_es968_pnp_is_probed = 0;
 }
 

sound/isa/es1688/es1688_lib.c

@@ -580,13 +580,6 @@ static int snd_es1688_free(struct snd_es1688 *chip)
 {
 	if (chip->hardware != ES1688_HW_UNDEF)
 		snd_es1688_init(chip, 0);
-	release_and_free_resource(chip->res_port);
-	if (chip->irq >= 0)
-		free_irq(chip->irq, (void *) chip);
-	if (chip->dma8 >= 0) {
-		disable_dma(chip->dma8);
-		free_dma(chip->dma8);
-	}
 	return 0;
 }
 
@@ -624,26 +617,25 @@ int snd_es1688_create(struct snd_card *card,
 	chip->dma8 = -1;
 	chip->hardware = ES1688_HW_UNDEF;
 	
-	chip->res_port = request_region(port + 4, 12, "ES1688");
+	if (!devm_request_region(card->dev, port + 4, 12, "ES1688")) {
-	if (chip->res_port == NULL) {
 		snd_printk(KERN_ERR "es1688: can't grab port 0x%lx\n", port + 4);
-		err = -EBUSY;
+		return -EBUSY;
-		goto exit;
 	}
 
-	err = request_irq(irq, snd_es1688_interrupt, 0, "ES1688", (void *) chip);
+	err = devm_request_irq(card->dev, irq, snd_es1688_interrupt, 0,
+			       "ES1688", (void *) chip);
 	if (err < 0) {
 		snd_printk(KERN_ERR "es1688: can't grab IRQ %d\n", irq);
-		goto exit;
+		return err;
 	}
 
 	chip->irq = irq;
 	card->sync_irq = chip->irq;
-	err = request_dma(dma8, "ES1688");
+	err = snd_devm_request_dma(card->dev, dma8, "ES1688");
 
 	if (err < 0) {
 		snd_printk(KERN_ERR "es1688: can't grab DMA8 %d\n", dma8);
-		goto exit;
+		return err;
 	}
 	chip->dma8 = dma8;
 
@@ -659,17 +651,14 @@ int snd_es1688_create(struct snd_card *card,
 
 	err = snd_es1688_probe(chip);
 	if (err < 0)
-		goto exit;
+		return err;
 
 	err = snd_es1688_init(chip, 1);
 	if (err < 0)
-		goto exit;
+		return err;
 
 	/* Register device */
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-exit:
-	if (err)
-		snd_es1688_free(chip);
 	return err;
 }