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toonie.c

/*
 * Apple Onboard Audio driver for Toonie codec
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 *
 *
 * This is a driver for the toonie codec chip. This chip is present
 * on the Mac Mini and is nothing but a DAC.
 */
#include <linux/delay.h>
#include <linux/module.h>
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("toonie codec driver for snd-aoa");

#include "../aoa.h"
#include "../soundbus/soundbus.h"


#define PFX "snd-aoa-codec-toonie: "

struct toonie {
      struct aoa_codec  codec;
};
#define codec_to_toonie(c) container_of(c, struct toonie, codec)

static int toonie_dev_register(struct snd_device *dev)
{
      return 0;
}

static struct snd_device_ops ops = {
      .dev_register = toonie_dev_register,
};

static struct transfer_info toonie_transfers[] = {
      /* This thing *only* has analog output,
       * the rates are taken from Info.plist
       * from Darwin. */
      {
            .formats = SNDRV_PCM_FMTBIT_S16_BE |
                     SNDRV_PCM_FMTBIT_S24_BE,
            .rates = SNDRV_PCM_RATE_32000 |
                   SNDRV_PCM_RATE_44100 |
                   SNDRV_PCM_RATE_48000 |
                   SNDRV_PCM_RATE_88200 |
                   SNDRV_PCM_RATE_96000,
      },
      {}
};

static int toonie_usable(struct codec_info_item *cii,
                   struct transfer_info *ti,
                   struct transfer_info *out)
{
      return 1;
}

#ifdef CONFIG_PM
static int toonie_suspend(struct codec_info_item *cii, pm_message_t state)
{
      /* can we turn it off somehow? */
      return 0;
}

static int toonie_resume(struct codec_info_item *cii)
{
      return 0;
}
#endif /* CONFIG_PM */

static struct codec_info toonie_codec_info = {
      .transfers = toonie_transfers,
      .sysclock_factor = 256,
      .bus_factor = 64,
      .owner = THIS_MODULE,
      .usable = toonie_usable,
#ifdef CONFIG_PM
      .suspend = toonie_suspend,
      .resume = toonie_resume,
#endif
};

static int toonie_init_codec(struct aoa_codec *codec)
{
      struct toonie *toonie = codec_to_toonie(codec);

      /* nothing connected? what a joke! */
      if (toonie->codec.connected != 1)
            return -ENOTCONN;

      if (aoa_snd_device_new(SNDRV_DEV_LOWLEVEL, toonie, &ops)) {
            printk(KERN_ERR PFX "failed to create toonie snd device!\n");
            return -ENODEV;
      }

      if (toonie->codec.soundbus_dev->attach_codec(toonie->codec.soundbus_dev,
                                         aoa_get_card(),
                                         &toonie_codec_info, toonie)) {
            printk(KERN_ERR PFX "error creating toonie pcm\n");
            snd_device_free(aoa_get_card(), toonie);
            return -ENODEV;
      }

      return 0;
}

static void toonie_exit_codec(struct aoa_codec *codec)
{
      struct toonie *toonie = codec_to_toonie(codec);

      if (!toonie->codec.soundbus_dev) {
            printk(KERN_ERR PFX "toonie_exit_codec called without soundbus_dev!\n");
            return;
      }
      toonie->codec.soundbus_dev->detach_codec(toonie->codec.soundbus_dev, toonie);
}

static struct toonie *toonie;

static int __init toonie_init(void)
{
      toonie = kzalloc(sizeof(struct toonie), GFP_KERNEL);

      if (!toonie)
            return -ENOMEM;

      strlcpy(toonie->codec.name, "toonie", sizeof(toonie->codec.name));
      toonie->codec.owner = THIS_MODULE;
      toonie->codec.init = toonie_init_codec;
      toonie->codec.exit = toonie_exit_codec;

      if (aoa_codec_register(&toonie->codec)) {
            kfree(toonie);
            return -EINVAL;
      }

      return 0;
}

static void __exit toonie_exit(void)
{
      aoa_codec_unregister(&toonie->codec);
      kfree(toonie);
}

module_init(toonie_init);
module_exit(toonie_exit);

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