1. 根目录:
2. include
3. drm
4. drm_sysfs.h

#ifndef _DRM_SYSFS_H_
#define _DRM_SYSFS_H_

/**
 * This minimalistic include file is intended for users (read TTM) that
 * don't want to include the full drmP.h file.
 */

extern int drm_class_device_register(struct device *dev);
extern void drm_class_device_unregister(struct device *dev);

#endif