text: /*
   * Copyright (C) 2012 Red Hat
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License v2. See the file COPYING in the main directory of this archive for
   * more details.
   */
  
  #include <linux/module.h>
  #include <drm/drmP.h>
  #include <drm/drm_crtc_helper.h>
  #include "udl_drv.h"
  
  static int udl_driver_set_busid(struct drm_device *d, struct drm_master *m)
  {
  	return 0;
  }
  
  static int udl_usb_suspend(struct usb_interface *interface,
  			   pm_message_t message)
  {
  	return 0;
  }
  
  static int udl_usb_resume(struct usb_interface *interface)
  {
  	struct drm_device *dev = usb_get_intfdata(interface);
  
  	udl_modeset_restore(dev);
  	return 0;
  }
  
  static const struct vm_operations_struct udl_gem_vm_ops = {
  	.fault = udl_gem_fault,
  	.open = drm_gem_vm_open,
  	.close = drm_gem_vm_close,
  };
  
  static const struct file_operations udl_driver_fops = {
  	.owner = THIS_MODULE,
  	.open = drm_open,
  	.mmap = udl_drm_gem_mmap,
  	.poll = drm_poll,
  	.read = drm_read,
  	.unlocked_ioctl	= drm_ioctl,
  	.release = drm_release,
  	.compat_ioctl = drm_compat_ioctl,
  	.llseek = noop_llseek,
  };
  
  static struct drm_driver driver = {
  	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
  	.load = udl_driver_load,
  	.unload = udl_driver_unload,
  	.set_busid = udl_driver_set_busid,
  
  	/* gem hooks */
  	.gem_free_object = udl_gem_free_object,
  	.gem_vm_ops = &udl_gem_vm_ops,
  
  	.dumb_create = udl_dumb_create,
  	.dumb_map_offset = udl_gem_mmap,
  	.dumb_destroy = drm_gem_dumb_destroy,
  	.fops = &udl_driver_fops,
  
  	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  	.gem_prime_export = udl_gem_prime_export,
  	.gem_prime_import = udl_gem_prime_import,
  
  	.name = DRIVER_NAME,
  	.desc = DRIVER_DESC,
  	.date = DRIVER_DATE,
  	.major = DRIVER_MAJOR,
  	.minor = DRIVER_MINOR,
  	.patchlevel = DRIVER_PATCHLEVEL,
  };
  
  static int udl_usb_probe(struct usb_interface *interface,
  			 const struct usb_device_id *id)
  {
  	struct usb_device *udev = interface_to_usbdev(interface);
  	struct drm_device *dev;
  	int r;
  
  	dev = drm_dev_alloc(&driver, &interface->dev);
  	if (IS_ERR(dev))
  		return PTR_ERR(dev);
  
  	r = drm_dev_register(dev, (unsigned long)udev);
  	if (r)
  		goto err_free;
  
  	usb_set_intfdata(interface, dev);
  	DRM_INFO("Initialized udl on minor %d\n", dev->primary->index);
  
  	return 0;
  
  err_free:
  	drm_dev_unref(dev);
  	return r;
  }
  
  static void udl_usb_disconnect(struct usb_interface *interface)
  {
  	struct drm_device *dev = usb_get_intfdata(interface);
  
  	drm_kms_helper_poll_disable(dev);
  	udl_fbdev_unplug(dev);
  	udl_drop_usb(dev);
  	drm_unplug_dev(dev);
  }
  
  /*
   * There are many DisplayLink-based graphics products, all with unique PIDs.
   * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
   * We also require a match on SubClass (0x00) and Protocol (0x00),
   * which is compatible with all known USB 2.0 era graphics chips and firmware,
   * but allows DisplayLink to increment those for any future incompatible chips
   */
  static struct usb_device_id id_table[] = {
  	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
  	 .bInterfaceSubClass = 0x00,
  	 .bInterfaceProtocol = 0x00,
  	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
  			USB_DEVICE_ID_MATCH_INT_CLASS |
  			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
  			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
  	{},
  };
  MODULE_DEVICE_TABLE(usb, id_table);
  
  static struct usb_driver udl_driver = {
  	.name = "udl",
  	.probe = udl_usb_probe,
  	.disconnect = udl_usb_disconnect,
  	.suspend = udl_usb_suspend,
  	.resume = udl_usb_resume,
  	.id_table = id_table,
  };
  module_usb_driver(udl_driver);
  MODULE_LICENSE("GPL");
  