static struct drm_driver driver = {
.driver_features =
DRIVER_USE_AGP | DRIVER_REQUIRE_AGP |
DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM,
.load = i915_driver_load,
.unload = i915_driver_unload,
.open = i915_driver_open,
.lastclose = i915_driver_lastclose,
.preclose = i915_driver_preclose,
.postclose = i915_driver_postclose,
.suspend = i915_suspend,
.resume = i915_resume,
.device_is_agp = i915_driver_device_is_agp,
.enable_vblank = i915_enable_vblank,
.disable_vblank = i915_disable_vblank,
.irq_preinstall = i915_driver_irq_preinstall,
.irq_postinstall = i915_driver_irq_postinstall,
.irq_uninstall = i915_driver_irq_uninstall,
.irq_handler = i915_driver_irq_handler,
.reclaim_buffers = drm_core_reclaim_buffers,
.get_map_ofs = drm_core_get_map_ofs,
.get_reg_ofs = drm_core_get_reg_ofs,
.master_create = i915_master_create,
.master_destroy = i915_master_destroy,
#if defined(CONFIG_DEBUG_FS)
.debugfs_init = i915_gem_debugfs_init,
.debugfs_cleanup = i915_gem_debugfs_cleanup,
#endif
.gem_init_object = i915_gem_init_object,
.gem_free_object = i915_gem_free_object,
.gem_vm_ops = &i915_gem_vm_ops,
.ioctls = i915_ioctls,
.fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
.ioctl = drm_ioctl,
.mmap = drm_gem_mmap,
.poll = drm_poll,
.fasync = drm_fasync,
#ifdef CONFIG_COMPAT
.compat_ioctl = i915_compat_ioctl,
#endif
},
.pci_driver = {
.name = DRIVER_NAME,
.id_table = pciidlist,
.probe = i915_pci_probe,
.remove = i915_pci_remove,
#ifdef CONFIG_PM
.resume = i915_pci_resume,
.suspend = i915_pci_suspend,
#endif
},
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCHLEVEL,
};
在這個結構體裡面，需要關注兩個成員：ioctls，fops。這兩個成員主要是用來給使用者提供操作接口的。
其中，fops是我們通常意義上的file_operations，他作為連接配接使用者程式和底層驅動的統一接口，也就是虛拟
檔案系統。而i915_ioctls，它并不是使用者程式可用的接口。使用者程式使用的操作依然是fops的drm_ioctl，而
drm_ioctl會把使用者的操作分發給具體的i915_ioctls。這裡為什麼要這樣寫屬于DRM子系統的範疇(也許顯示卡
等裝置需要的IOCTL操作是最複雜和重要的，是以才突出來吧)。
2 實作