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adlib.c

/*
 * AdLib FM card driver.
 */

#include <sound/driver.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/opl3.h>

#define CRD_NAME "AdLib FM"
#define DRV_NAME "snd_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 int 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 struct platform_device *devices[SNDRV_CARDS];

static void snd_adlib_free(struct snd_card *card)
{
      release_and_free_resource(card->private_data);
}

static int __devinit snd_adlib_probe(struct platform_device *device)
{
      struct snd_card *card;
      struct snd_opl3 *opl3;

      int error, i = device->id;

      if (port[i] == SNDRV_AUTO_PORT) {
            snd_printk(KERN_ERR DRV_NAME ": please specify port\n");
            error = -EINVAL;
            goto out0;
      }

      card = snd_card_new(index[i], id[i], THIS_MODULE, 0);
      if (!card) {
            snd_printk(KERN_ERR DRV_NAME ": could not create card\n");
            error = -EINVAL;
            goto out0;
      }

      card->private_data = request_region(port[i], 4, CRD_NAME);
      if (!card->private_data) {
            snd_printk(KERN_ERR DRV_NAME ": could not grab ports\n");
            error = -EBUSY;
            goto out1;
      }
      card->private_free = snd_adlib_free;

      error = snd_opl3_create(card, port[i], port[i] + 2, OPL3_HW_AUTO, 1, &opl3);
      if (error < 0) {
            snd_printk(KERN_ERR DRV_NAME ": could not create OPL\n");
            goto out1;
      }

      error = snd_opl3_hwdep_new(opl3, 0, 0, NULL);
      if (error < 0) {
            snd_printk(KERN_ERR DRV_NAME ": could not create FM\n");
            goto out1;
      }

      strcpy(card->driver, DRV_NAME);
      strcpy(card->shortname, CRD_NAME);
      sprintf(card->longname, CRD_NAME " at %#lx", port[i]);

      snd_card_set_dev(card, &device->dev);

      error = snd_card_register(card);
      if (error < 0) {
            snd_printk(KERN_ERR DRV_NAME ": could not register card\n");
            goto out1;
      }

      platform_set_drvdata(device, card);
      return 0;

out1: snd_card_free(card);
out0: return error;
}

static int __devexit snd_adlib_remove(struct platform_device *device)
{
      snd_card_free(platform_get_drvdata(device));
      platform_set_drvdata(device, NULL);
      return 0;
}

static struct platform_driver snd_adlib_driver = {
      .probe            = snd_adlib_probe,
      .remove           = __devexit_p(snd_adlib_remove),

      .driver           = {
            .name = DRV_NAME
      }
};

static int __init alsa_card_adlib_init(void)
{
      int i, cards;

      if (platform_driver_register(&snd_adlib_driver) < 0) {
            snd_printk(KERN_ERR DRV_NAME ": could not register driver\n");
            return -ENODEV;
      }

      for (cards = 0, i = 0; i < SNDRV_CARDS; i++) {
            struct platform_device *device;

            if (!enable[i])
                  continue;

            device = platform_device_register_simple(DRV_NAME, i, NULL, 0);
            if (IS_ERR(device))
                  continue;

            if (!platform_get_drvdata(device)) {
                  platform_device_unregister(device);
                  continue;
            }

            devices[i] = device;
            cards++;
      }

      if (!cards) {
#ifdef MODULE
            printk(KERN_ERR CRD_NAME " soundcard not found or device busy\n");
#endif
            platform_driver_unregister(&snd_adlib_driver);
            return -ENODEV;
      }
      return 0;
}

static void __exit alsa_card_adlib_exit(void)
{
      int i;

      for (i = 0; i < SNDRV_CARDS; i++)
            platform_device_unregister(devices[i]);
      platform_driver_unregister(&snd_adlib_driver);
}

module_init(alsa_card_adlib_init);
module_exit(alsa_card_adlib_exit);

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