text: /*
   * AdLib FM card driver.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/isa.h>
  #include <sound/core.h>
  #include <sound/initval.h>
  #include <sound/opl3.h>
  
  #define CRD_NAME "AdLib FM"
  #define DEV_NAME "adlib"
  
  MODULE_DESCRIPTION(CRD_NAME);
  MODULE_AUTHOR("Rene Herman");
  MODULE_LICENSE("GPL");
  
  static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;
  static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
  
  module_param_array(index, int, NULL, 0444);
  MODULE_PARM_DESC(index, "Index value for " CRD_NAME " soundcard.");
  module_param_array(id, charp, NULL, 0444);
  MODULE_PARM_DESC(id, "ID string for " CRD_NAME " soundcard.");
  module_param_array(enable, bool, NULL, 0444);
  MODULE_PARM_DESC(enable, "Enable " CRD_NAME " soundcard.");
  module_param_array(port, long, NULL, 0444);
  MODULE_PARM_DESC(port, "Port # for " CRD_NAME " driver.");
  
  static int snd_adlib_match(struct device *dev, unsigned int n)
  {
  	if (!enable[n])
  		return 0;
  
  	if (port[n] == SNDRV_AUTO_PORT) {
  		dev_err(dev, "please specify port\n");
  		return 0;
  	}
  	return 1;
  }
  
  static void snd_adlib_free(struct snd_card *card)
  {
  	release_and_free_resource(card->private_data);
  }
  
  static int snd_adlib_probe(struct device *dev, unsigned int n)
  {
  	struct snd_card *card;
  	struct snd_opl3 *opl3;
  	int error;
  
  	error = snd_card_create(index[n], id[n], THIS_MODULE, 0, &card);
  	if (error < 0) {
  		dev_err(dev, "could not create card\n");
  		return error;
  	}
  
  	card->private_data = request_region(port[n], 4, CRD_NAME);
  	if (!card->private_data) {
  		dev_err(dev, "could not grab ports\n");
  		error = -EBUSY;
  		goto out;
  	}
  	card->private_free = snd_adlib_free;
  
  	strcpy(card->driver, DEV_NAME);
  	strcpy(card->shortname, CRD_NAME);
  	sprintf(card->longname, CRD_NAME " at %#lx", port[n]);
  
  	error = snd_opl3_create(card, port[n], port[n] + 2, OPL3_HW_AUTO, 1, &opl3);
  	if (error < 0) {
  		dev_err(dev, "could not create OPL\n");
  		goto out;
  	}
  
  	error = snd_opl3_hwdep_new(opl3, 0, 0, NULL);
  	if (error < 0) {
  		dev_err(dev, "could not create FM\n");
  		goto out;
  	}
  
  	snd_card_set_dev(card, dev);
  
  	error = snd_card_register(card);
  	if (error < 0) {
  		dev_err(dev, "could not register card\n");
  		goto out;
  	}
  
  	dev_set_drvdata(dev, card);
  	return 0;
  
  out:	snd_card_free(card);
  	return error;
  }
  
  static int snd_adlib_remove(struct device *dev, unsigned int n)
  {
  	snd_card_free(dev_get_drvdata(dev));
  	return 0;
  }
  
  static struct isa_driver snd_adlib_driver = {
  	.match		= snd_adlib_match,
  	.probe		= snd_adlib_probe,
  	.remove		= snd_adlib_remove,
  
  	.driver		= {
  		.name	= DEV_NAME
  	}
  };
  
  static int __init alsa_card_adlib_init(void)
  {
  	return isa_register_driver(&snd_adlib_driver, SNDRV_CARDS);
  }
  
  static void __exit alsa_card_adlib_exit(void)
  {
  	isa_unregister_driver(&snd_adlib_driver);
  }
  
  module_init(alsa_card_adlib_init);
  module_exit(alsa_card_adlib_exit);
  