ALSA: pcsp: Allocate resources with device-managed APIs

Use the new snd_devm_card_new() for the card object allocation and the
devres version for the input device, and clean up the superfluous
remove callback.

Link: https://lore.kernel.org/r/20210715075941.23332-80-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: tiwai

sound/drivers/pcsp/pcsp.c

@@ -42,9 +42,8 @@ struct snd_pcsp pcsp_chip;
 
 static int snd_pcsp_create(struct snd_card *card)
 {
-	static const struct snd_device_ops ops = { };
 	unsigned int resolution = hrtimer_resolution;
-	int err, div, min_div, order;
+	int div, min_div, order;
 
 	if (!nopcm) {
 		if (resolution > PCSP_MAX_PERIOD_NS) {
@@ -83,15 +82,18 @@ static int snd_pcsp_create(struct snd_card *card)
 	pcsp_chip.port = 0x61;
 	pcsp_chip.irq = -1;
 	pcsp_chip.dma = -1;
-
-	/* Register device */
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
-	if (err < 0)
-		return err;
+	card->private_data = &pcsp_chip;
 
 	return 0;
 }
 
+static void pcsp_stop_beep(struct snd_pcsp *chip);
+
+static void alsa_card_pcsp_free(struct snd_card *card)
+{
+	pcsp_stop_beep(card->private_data);
+}
+
 static int snd_card_pcsp_probe(int devnum, struct device *dev)
 {
 	struct snd_card *card;
@@ -103,22 +105,22 @@ static int snd_card_pcsp_probe(int devnum, struct device *dev)
 	hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	pcsp_chip.timer.function = pcsp_do_timer;
 
-	err = snd_card_new(dev, index, id, THIS_MODULE, 0, &card);
+	err = snd_devm_card_new(dev, index, id, THIS_MODULE, 0, &card);
 	if (err < 0)
 		return err;
 
 	err = snd_pcsp_create(card);
 	if (err < 0)
-		goto free_card;
+		return err;
 
 	if (!nopcm) {
 		err = snd_pcsp_new_pcm(&pcsp_chip);
 		if (err < 0)
-			goto free_card;
+			return err;
 	}
 	err = snd_pcsp_new_mixer(&pcsp_chip, nopcm);
 	if (err < 0)
-		goto free_card;
+		return err;
 
 	strcpy(card->driver, "PC-Speaker");
 	strcpy(card->shortname, "pcsp");
@@ -127,13 +129,10 @@ static int snd_card_pcsp_probe(int devnum, struct device *dev)
 
 	err = snd_card_register(card);
 	if (err < 0)
-		goto free_card;
+		return err;
+	card->private_free = alsa_card_pcsp_free;
 
 	return 0;
-
-free_card:
-	snd_card_free(card);
-	return err;
 }
 
 static int alsa_card_pcsp_init(struct device *dev)
@@ -155,11 +154,6 @@ static int alsa_card_pcsp_init(struct device *dev)
 	return 0;
 }
 
-static void alsa_card_pcsp_exit(struct snd_pcsp *chip)
-{
-	snd_card_free(chip->card);
-}
-
 static int pcsp_probe(struct platform_device *dev)
 {
 	int err;
@@ -169,23 +163,13 @@ static int pcsp_probe(struct platform_device *dev)
 		return err;
 
 	err = alsa_card_pcsp_init(&dev->dev);
-	if (err < 0) {
-		pcspkr_input_remove(pcsp_chip.input_dev);
+	if (err < 0)
 		return err;
-	}
 
 	platform_set_drvdata(dev, &pcsp_chip);
 	return 0;
 }
 
-static int pcsp_remove(struct platform_device *dev)
-{
-	struct snd_pcsp *chip = platform_get_drvdata(dev);
-	pcspkr_input_remove(chip->input_dev);
-	alsa_card_pcsp_exit(chip);
-	return 0;
-}
-
 static void pcsp_stop_beep(struct snd_pcsp *chip)
 {
 	pcsp_sync_stop(chip);
@@ -218,7 +202,6 @@ static struct platform_driver pcsp_platform_driver = {
 		.pm	= PCSP_PM_OPS,
 	},
 	.probe		= pcsp_probe,
-	.remove		= pcsp_remove,
 	.shutdown	= pcsp_shutdown,
 };
 

sound/drivers/pcsp/pcsp_input.c

@@ -78,7 +78,7 @@ int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
 {
 	int err;
 
-	struct input_dev *input_dev = input_allocate_device();
+	struct input_dev *input_dev = devm_input_allocate_device(dev);
 	if (!input_dev)
 		return -ENOMEM;
 
@@ -95,19 +95,9 @@ int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
 	input_dev->event = pcspkr_input_event;
 
 	err = input_register_device(input_dev);
-	if (err) {
-		input_free_device(input_dev);
+	if (err)
 		return err;
-	}
 
 	*rdev = input_dev;
 	return 0;
 }
-
-int pcspkr_input_remove(struct input_dev *dev)
-{
-	pcspkr_stop_sound();
-	input_unregister_device(dev);	/* this also does kfree() */
-
-	return 0;
-}

sound/drivers/pcsp/pcsp_input.h

@@ -9,7 +9,6 @@
 #define __PCSP_INPUT_H__
 
 int pcspkr_input_init(struct input_dev **rdev, struct device *dev);
-int pcspkr_input_remove(struct input_dev *dev);
 void pcspkr_stop_sound(void);
 
 #endif