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core.c

/*
 * soundbus
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */

#include <linux/module.h>
#include "soundbus.h"

MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Apple Soundbus");

struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
{
      struct device *tmp;

      if (!dev)
            return NULL;
      tmp = get_device(&dev->ofdev.dev);
      if (tmp)
            return to_soundbus_device(tmp);
      else
            return NULL;
}
EXPORT_SYMBOL_GPL(soundbus_dev_get);

void soundbus_dev_put(struct soundbus_dev *dev)
{
      if (dev)
            put_device(&dev->ofdev.dev);
}
EXPORT_SYMBOL_GPL(soundbus_dev_put);

static int soundbus_probe(struct device *dev)
{
      int error = -ENODEV;
      struct soundbus_driver *drv;
      struct soundbus_dev *soundbus_dev;

      drv = to_soundbus_driver(dev->driver);
      soundbus_dev = to_soundbus_device(dev);

      if (!drv->probe)
            return error;

      soundbus_dev_get(soundbus_dev);

      error = drv->probe(soundbus_dev);
      if (error)
            soundbus_dev_put(soundbus_dev);

      return error;
}


static int soundbus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
      struct soundbus_dev * soundbus_dev;
      struct platform_device * of;
      const char *compat;
      int retval = 0;
      int cplen, seen = 0;

      if (!dev)
            return -ENODEV;

      soundbus_dev = to_soundbus_device(dev);
      if (!soundbus_dev)
            return -ENODEV;

      of = &soundbus_dev->ofdev;

      /* stuff we want to pass to /sbin/hotplug */
      retval = add_uevent_var(env, "OF_NAME=%s", of->dev.of_node->name);
      if (retval)
            return retval;

      retval = add_uevent_var(env, "OF_TYPE=%s", of->dev.of_node->type);
      if (retval)
            return retval;

      /* Since the compatible field can contain pretty much anything
       * it's not really legal to split it out with commas. We split it
       * up using a number of environment variables instead. */

      compat = of_get_property(of->dev.of_node, "compatible", &cplen);
      while (compat && cplen > 0) {
            int tmp = env->buflen;
            retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
            if (retval)
                  return retval;
            compat += env->buflen - tmp;
            cplen -= env->buflen - tmp;
            seen += 1;
      }

      retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
      if (retval)
            return retval;
      retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);

      return retval;
}

static int soundbus_device_remove(struct device *dev)
{
      struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
      struct soundbus_driver * drv = to_soundbus_driver(dev->driver);

      if (dev->driver && drv->remove)
            drv->remove(soundbus_dev);
      soundbus_dev_put(soundbus_dev);

      return 0;
}

static void soundbus_device_shutdown(struct device *dev)
{
      struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
      struct soundbus_driver * drv = to_soundbus_driver(dev->driver);

      if (dev->driver && drv->shutdown)
            drv->shutdown(soundbus_dev);
}

#ifdef CONFIG_PM

static int soundbus_device_suspend(struct device *dev, pm_message_t state)
{
      struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
      struct soundbus_driver * drv = to_soundbus_driver(dev->driver);

      if (dev->driver && drv->suspend)
            return drv->suspend(soundbus_dev, state);
      return 0;
}

static int soundbus_device_resume(struct device * dev)
{
      struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
      struct soundbus_driver * drv = to_soundbus_driver(dev->driver);

      if (dev->driver && drv->resume)
            return drv->resume(soundbus_dev);
      return 0;
}

#endif /* CONFIG_PM */

static struct bus_type soundbus_bus_type = {
      .name       = "aoa-soundbus",
      .probe            = soundbus_probe,
      .uevent           = soundbus_uevent,
      .remove           = soundbus_device_remove,
      .shutdown   = soundbus_device_shutdown,
#ifdef CONFIG_PM
      .suspend    = soundbus_device_suspend,
      .resume           = soundbus_device_resume,
#endif
      .dev_attrs  = soundbus_dev_attrs,
};

int soundbus_add_one(struct soundbus_dev *dev)
{
      static int devcount;

      /* sanity checks */
      if (!dev->attach_codec ||
          !dev->ofdev.dev.of_node ||
          dev->pcmname ||
          dev->pcmid != -1) {
            printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
            return -EINVAL;
      }

      dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount);
      dev->ofdev.dev.bus = &soundbus_bus_type;
      return of_device_register(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_add_one);

void soundbus_remove_one(struct soundbus_dev *dev)
{
      of_device_unregister(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_remove_one);

int soundbus_register_driver(struct soundbus_driver *drv)
{
      /* initialize common driver fields */
      drv->driver.name = drv->name;
      drv->driver.bus = &soundbus_bus_type;

      /* register with core */
      return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_register_driver);

void soundbus_unregister_driver(struct soundbus_driver *drv)
{
      driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_unregister_driver);

static int __init soundbus_init(void)
{
      return bus_register(&soundbus_bus_type);
}

static void __exit soundbus_exit(void)
{
      bus_unregister(&soundbus_bus_type);
}

subsys_initcall(soundbus_init);
module_exit(soundbus_exit);

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