adlib.c

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/*
 * 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 __devinit 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 __devinit 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 __devexit snd_adlib_remove(struct device *dev, unsigned int n)
{
    snd_card_free(dev_get_drvdata(dev));
    dev_set_drvdata(dev, NULL);
    return 0;
}

static struct isa_driver snd_adlib_driver = {
    .match      = snd_adlib_match,
    .probe      = snd_adlib_probe,
    .remove     = __devexit_p(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);