alsa.c

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/*
 * Apple Onboard Audio Alsa helpers
 *
 * Copyright 2006 Johannes Berg <[email protected]>
 *
 * GPL v2, can be found in COPYING.
 */
#include <linux/module.h>
#include "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 device *dev)
{
    struct snd_card *alsa_card;
    int err;

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

    err = snd_card_create(index, name, mod, sizeof(struct aoa_card),
                  &alsa_card);
    if (err < 0)
        return err;
    aoa_card = alsa_card->private_data;
    aoa_card->alsa_card = alsa_card;
    alsa_card->dev = dev;
    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);