platform_device_compat.h

#ifndef __PLATFORM_DEVICE_COMPAT_H
#define __PLATFORM_DEVICE_COMPAT_H

#include <linux/device.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)

struct platform_device {
      struct device dev;
      const char *name;
      int id;
      struct list_head list;
};

#define to_platform_device(dev)     ((struct platform_device *)(dev))

extern struct bus_type snd_platform_bus_type;
#define platform_device_register_simple   snd_platform_device_register_simple
#define platform_device_unregister snd_platform_device_unregister
#define platform_bus_type     snd_platform_bus_type

struct platform_device *snd_platform_device_register_simple(const char *name, int id,
                                              struct resource *res, int nres);

static inline void snd_platform_device_unregister(struct platform_device *pdev)
{
      /* pdev gets freed in snd_compat_driver_unregister() */
}

#endif /* < 2.6.0 */

struct platform_driver {
      struct device_driver driver;
      int (*probe)(struct platform_device *);
      int (*remove)(struct platform_device *);
      void (*shutdown)(struct platform_device *);
      int (*suspend)(struct platform_device *, pm_message_t state);
      int (*resume)(struct platform_device *);
};

static int snd_platform_driver_probe(struct device *dev)
{
      struct platform_driver *drv;
      drv = (struct platform_driver *)dev->driver;
      return drv->probe(to_platform_device(dev));
}

static int snd_platform_driver_remove(struct device *dev)
{
      struct platform_driver *drv;
      drv = (struct platform_driver *)dev->driver;
      return drv->remove(to_platform_device(dev));
}

static int snd_platform_driver_suspend(struct device *dev, pm_message_t state
#ifdef CONFIG_SND_OLD_DRIVER_SUSPEND
                               , u32 level
#endif
                               )
{
      struct platform_driver *drv;
#ifdef CONFIG_SND_OLD_DRIVER_SUSPEND
      if (level != SUSPEND_DISABLE)
            return 0;
#endif
      drv = (struct platform_driver *)dev->driver;
      return drv->suspend(to_platform_device(dev), state);
}

static int snd_platform_driver_resume(struct device *dev
#ifdef CONFIG_SND_OLD_DRIVER_SUSPEND
                              , u32 level
#endif
                              )
{
      struct platform_driver *drv;
#ifdef CONFIG_SND_OLD_DRIVER_SUSPEND
      if (level != RESUME_ENABLE)
            return 0;
#endif
      drv = (struct platform_driver *)dev->driver;
      return drv->resume(to_platform_device(dev));
}

static inline int platform_driver_register(struct platform_driver *drv)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
      drv->driver.bus = &platform_bus_type;
#endif
      if (drv->probe)
            drv->driver.probe = snd_platform_driver_probe;
      if (drv->remove)
            drv->driver.remove = snd_platform_driver_remove;
      if (drv->suspend)
            drv->driver.suspend = snd_platform_driver_suspend;
      if (drv->resume)
            drv->driver.resume = snd_platform_driver_resume;
      return driver_register(&drv->driver);
}

static inline void platform_driver_unregister(struct platform_driver *drv)
{
      driver_unregister(&drv->driver);
}

#define platform_get_drvdata(_dev)  dev_get_drvdata(&(_dev)->dev)
#define platform_set_drvdata(_dev,data)   dev_set_drvdata(&(_dev)->dev, (data))

#endif