text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (C) 2012 Red Hat
   */
  
  #include <linux/module.h>
  
  #include <drm/drm_crtc_helper.h>
  #include <drm/drm_drv.h>
  #include <drm/drm_fb_helper.h>
  #include <drm/drm_file.h>
  #include <drm/drm_gem_shmem_helper.h>
  #include <drm/drm_managed.h>
  #include <drm/drm_ioctl.h>
  #include <drm/drm_probe_helper.h>
  #include <drm/drm_print.h>
  
  #include "udl_drv.h"
  
  static int udl_usb_suspend(struct usb_interface *interface,
  			   pm_message_t message)
  {
  	struct drm_device *dev = usb_get_intfdata(interface);
  
  	return drm_mode_config_helper_suspend(dev);
  }
  
  static int udl_usb_resume(struct usb_interface *interface)
  {
  	struct drm_device *dev = usb_get_intfdata(interface);
  
  	return drm_mode_config_helper_resume(dev);
  }
  
  DEFINE_DRM_GEM_FOPS(udl_driver_fops);
  
  static struct drm_driver driver = {
  	.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
  
  	/* gem hooks */
  	.gem_create_object = udl_driver_gem_create_object,
  
  	.fops = &udl_driver_fops,
  	DRM_GEM_SHMEM_DRIVER_OPS,
  
  	.name = DRIVER_NAME,
  	.desc = DRIVER_DESC,
  	.date = DRIVER_DATE,
  	.major = DRIVER_MAJOR,
  	.minor = DRIVER_MINOR,
  	.patchlevel = DRIVER_PATCHLEVEL,
  };
  
  static struct udl_device *udl_driver_create(struct usb_interface *interface)
  {
  	struct usb_device *udev = interface_to_usbdev(interface);
  	struct udl_device *udl;
  	int r;
  
  	udl = devm_drm_dev_alloc(&interface->dev, &driver,
  				 struct udl_device, drm);
  	if (IS_ERR(udl))
  		return udl;
  
  	udl->udev = udev;
  
  	r = udl_init(udl);
  	if (r)
  		return ERR_PTR(r);
  
  	usb_set_intfdata(interface, udl);
  
  	return udl;
  }
  
  static int udl_usb_probe(struct usb_interface *interface,
  			 const struct usb_device_id *id)
  {
  	int r;
  	struct udl_device *udl;
  
  	udl = udl_driver_create(interface);
  	if (IS_ERR(udl))
  		return PTR_ERR(udl);
  
  	r = drm_dev_register(&udl->drm, 0);
  	if (r)
  		return r;
  
  	DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
  
  	drm_fbdev_generic_setup(&udl->drm, 0);
  
  	return 0;
  }
  
  static void udl_usb_disconnect(struct usb_interface *interface)
  {
  	struct drm_device *dev = usb_get_intfdata(interface);
  
  	drm_kms_helper_poll_fini(dev);
  	udl_drop_usb(dev);
  	drm_dev_unplug(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 const 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");
  