[ALSA] ad1848 - Use platform_device, add PM

Modules: AD1848 driver

Rewrite the probe/remove with platform_device.
Add the PM support, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/ad1848/ad1848.c

@@ -23,6 +23,8 @@
 
 #include <sound/driver.h>
 #include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
 #include <linux/time.h>
 #include <linux/wait.h>
 #include <linux/moduleparam.h>
@@ -60,11 +62,10 @@ MODULE_PARM_DESC(dma1, "DMA1 # for AD1848 driver.");
 module_param_array(thinkpad, bool, NULL, 0444);
 MODULE_PARM_DESC(thinkpad, "Enable only for the onboard CS4248 of IBM Thinkpad 360/750/755 series.");
 
-static struct snd_card *snd_ad1848_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 
-
-static int __init snd_card_ad1848_probe(int dev)
+static int __init snd_ad1848_probe(struct platform_device *pdev)
 {
+	int dev = pdev->id;
 	struct snd_card *card;
 	struct snd_ad1848 *chip;
 	struct snd_pcm *pcm;
@@ -93,6 +94,7 @@ static int __init snd_card_ad1848_probe(int dev)
 				     thinkpad[dev] ? AD1848_HW_THINKPAD : AD1848_HW_DETECT,
 				     &chip)) < 0)
 		goto _err;
+	card->private_data = chip;
 
 	if ((err = snd_ad1848_pcm(chip, 0, &pcm)) < 0)
 		goto _err;
@@ -109,43 +111,98 @@ static int __init snd_card_ad1848_probe(int dev)
 	if (thinkpad[dev])
 		strcat(card->longname, " [Thinkpad]");
 
-	if ((err = snd_card_set_generic_dev(card)) < 0)
-		goto _err;
+	snd_card_set_dev(card, &pdev->dev);
 
 	if ((err = snd_card_register(card)) < 0)
 		goto _err;
 
-	snd_ad1848_cards[dev] = card;
+	platform_set_drvdata(pdev, card);
 	return 0;
 
  _err:
 	snd_card_free(card);
 	return err;
 }
 
-static int __init alsa_card_ad1848_init(void)
+static int __devexit snd_ad1848_remove(struct platform_device *devptr)
+{
+	snd_card_free(platform_get_drvdata(devptr));
+	platform_set_drvdata(devptr, NULL);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int snd_ad1848_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct snd_card *card = platform_get_drvdata(pdev);
+	struct snd_ad1848 *chip = card->private_data;
+
+	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+	chip->suspend(chip);
+	return 0;
+}
+
+static int snd_ad1848_resume(struct platform_device *pdev)
 {
-	int dev, cards;
+	struct snd_card *card = platform_get_drvdata(pdev);
+	struct snd_ad1848 *chip = card->private_data;
 
-	for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++)
-		if (snd_card_ad1848_probe(dev) >= 0)
-			cards++;
+	chip->resume(chip);
+	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+	return 0;
+}
+#endif
+
+#define SND_AD1848_DRIVER	"snd_ad1848"
+
+static struct platform_driver snd_ad1848_driver = {
+	.probe		= snd_ad1848_probe,
+	.remove		= __devexit_p(snd_ad1848_remove),
+#ifdef CONFIG_PM
+	.suspend	= snd_ad1848_suspend,
+	.resume		= snd_ad1848_resume,
+#endif
+	.driver		= {
+		.name	= SND_AD1848_DRIVER
+	},
+};
 
+static int __init alsa_card_ad1848_init(void)
+{
+	int i, cards, err;
+
+	err = platform_driver_register(&snd_ad1848_driver);
+	if (err < 0)
+		return err;
+
+	cards = 0;
+	for (i = 0; i < SNDRV_CARDS && enable[i]; i++) {
+		struct platform_device *device;
+		device = platform_device_register_simple(SND_AD1848_DRIVER,
+							 i, NULL, 0);
+		if (IS_ERR(device)) {
+			err = PTR_ERR(device);
+			goto errout;
+		}
+		cards++;
+	}
 	if (!cards) {
 #ifdef MODULE
 		printk(KERN_ERR "AD1848 soundcard not found or device busy\n");
 #endif
-		return -ENODEV;
+		err = -ENODEV;
+		goto errout;
 	}
 	return 0;
+
+ errout:
+	platform_driver_unregister(&snd_ad1848_driver);
+	return err;
 }
 
 static void __exit alsa_card_ad1848_exit(void)
 {
-	int idx;
-
-	for (idx = 0; idx < SNDRV_CARDS; idx++)
-		snd_card_free(snd_ad1848_cards[idx]);
+	platform_driver_unregister(&snd_ad1848_driver);
 }
 
 module_init(alsa_card_ad1848_init)