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snd-aoa-alsa.c

/*
 * Apple Onboard Audio Alsa helpers
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */
#include <linux/module.h>
#include "snd-aoa-alsa.h"

static int index = -1;
module_param(index, int, 0444);
MODULE_PARM_DESC(index, "index for AOA sound card.");

static struct aoa_card *aoa_card;

int aoa_alsa_init(char *name, struct module *mod)
{
      struct snd_card *alsa_card;
      int err;

      if (aoa_card)
            /* cannot be EEXIST due to usage in aoa_fabric_register */
            return -EBUSY;

      alsa_card = snd_card_new(index, name, mod, sizeof(struct aoa_card));
      if (!alsa_card)
            return -ENOMEM;
      aoa_card = alsa_card->private_data;
      aoa_card->alsa_card = alsa_card;
      strlcpy(alsa_card->driver, "AppleOnbdAudio", sizeof(alsa_card->driver));
      strlcpy(alsa_card->shortname, name, sizeof(alsa_card->shortname));
      strlcpy(alsa_card->longname, name, sizeof(alsa_card->longname));
      strlcpy(alsa_card->mixername, name, sizeof(alsa_card->mixername));
      err = snd_card_register(aoa_card->alsa_card);
      if (err < 0) {
            printk(KERN_ERR "snd-aoa: couldn't register alsa card\n");
            snd_card_free(aoa_card->alsa_card);
            aoa_card = NULL;
            return err;
      }
      return 0;
}

struct snd_card *aoa_get_card(void)
{
      if (aoa_card)
            return aoa_card->alsa_card;
      return NULL;
}
EXPORT_SYMBOL_GPL(aoa_get_card);

void aoa_alsa_cleanup(void)
{
      if (aoa_card) {
            snd_card_free(aoa_card->alsa_card);
            aoa_card = NULL;
      }
}

int aoa_snd_device_new(snd_device_type_t type,
        void * device_data, struct snd_device_ops * ops)
{
      struct snd_card *card = aoa_get_card();
      int err;
      
      if (!card) return -ENOMEM;

      err = snd_device_new(card, type, device_data, ops);
      if (err) {
            printk(KERN_ERR "snd-aoa: failed to create snd device (%d)\n", err);
            return err;
      }
      err = snd_device_register(card, device_data);
      if (err) {
            printk(KERN_ERR "snd-aoa: failed to register "
                        "snd device (%d)\n", err);
            printk(KERN_ERR "snd-aoa: have you forgotten the "
                        "dev_register callback?\n");
            snd_device_free(card, device_data);
      }
      return err;
}
EXPORT_SYMBOL_GPL(aoa_snd_device_new);

int aoa_snd_ctl_add(struct snd_kcontrol* control)
{
      int err;

      if (!aoa_card) return -ENODEV;

      err = snd_ctl_add(aoa_card->alsa_card, control);
      if (err)
            printk(KERN_ERR "snd-aoa: failed to add alsa control (%d)\n",
                   err);
      return err;
}
EXPORT_SYMBOL_GPL(aoa_snd_ctl_add);

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