drivers/gpu/drm/udl/udl_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Red Hat
   4  */
   5
   6 #include <linux/module.h>
   7
   8 #include <drm/drm_crtc_helper.h>
   9 #include <drm/drm_drv.h>
  10 #include <drm/drm_fb_helper.h>
  11 #include <drm/drm_file.h>
  12 #include <drm/drm_gem_shmem_helper.h>
  13 #include <drm/drm_managed.h>
  14 #include <drm/drm_ioctl.h>
  15 #include <drm/drm_probe_helper.h>
  16 #include <drm/drm_print.h>
  17
  18 #include "udl_drv.h"
  19
  20 static int udl_usb_suspend(struct usb_interface *interface,
  21                            pm_message_t message)
  22 {
  23         struct drm_device *dev = usb_get_intfdata(interface);
  24
  25         return drm_mode_config_helper_suspend(dev);
  26 }
  27
  28 static int udl_usb_resume(struct usb_interface *interface)
  29 {
  30         struct drm_device *dev = usb_get_intfdata(interface);
  31
  32         return drm_mode_config_helper_resume(dev);
  33 }
  34
  35 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
  36
  37 static const struct drm_driver driver = {
  38         .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
  39
  40         /* GEM hooks */
  41         .gem_create_object = drm_gem_shmem_create_object_cached,
  42
  43         .fops = &udl_driver_fops,
  44         DRM_GEM_SHMEM_DRIVER_OPS,
  45
  46         .name = DRIVER_NAME,
  47         .desc = DRIVER_DESC,
  48         .date = DRIVER_DATE,
  49         .major = DRIVER_MAJOR,
  50         .minor = DRIVER_MINOR,
  51         .patchlevel = DRIVER_PATCHLEVEL,
  52 };
  53
  54 static struct udl_device *udl_driver_create(struct usb_interface *interface)
  55 {
  56         struct udl_device *udl;
  57         int r;
  58
  59         udl = devm_drm_dev_alloc(&interface->dev, &driver,
  60                                  struct udl_device, drm);
  61         if (IS_ERR(udl))
  62                 return udl;
  63
  64         r = udl_init(udl);
  65         if (r)
  66                 return ERR_PTR(r);
  67
  68         usb_set_intfdata(interface, udl);
  69
  70         return udl;
  71 }
  72
  73 static int udl_usb_probe(struct usb_interface *interface,
  74                          const struct usb_device_id *id)
  75 {
  76         int r;
  77         struct udl_device *udl;
  78
  79         udl = udl_driver_create(interface);
  80         if (IS_ERR(udl))
  81                 return PTR_ERR(udl);
  82
  83         r = drm_dev_register(&udl->drm, 0);
  84         if (r)
  85                 return r;
  86
  87         DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
  88
  89         drm_fbdev_generic_setup(&udl->drm, 0);
  90
  91         return 0;
  92 }
  93
  94 static void udl_usb_disconnect(struct usb_interface *interface)
  95 {
  96         struct drm_device *dev = usb_get_intfdata(interface);
  97
  98         drm_kms_helper_poll_fini(dev);
  99         udl_drop_usb(dev);
 100         drm_dev_unplug(dev);
 101 }
 102
 103 /*
 104  * There are many DisplayLink-based graphics products, all with unique PIDs.
 105  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 106  * We also require a match on SubClass (0x00) and Protocol (0x00),
 107  * which is compatible with all known USB 2.0 era graphics chips and firmware,
 108  * but allows DisplayLink to increment those for any future incompatible chips
 109  */
 110 static const struct usb_device_id id_table[] = {
 111         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 112          .bInterfaceSubClass = 0x00,
 113          .bInterfaceProtocol = 0x00,
 114          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 115                         USB_DEVICE_ID_MATCH_INT_CLASS |
 116                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 117                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 118         {},
 119 };
 120 MODULE_DEVICE_TABLE(usb, id_table);
 121
 122 static struct usb_driver udl_driver = {
 123         .name = "udl",
 124         .probe = udl_usb_probe,
 125         .disconnect = udl_usb_disconnect,
 126         .suspend = udl_usb_suspend,
 127         .resume = udl_usb_resume,
 128         .id_table = id_table,
 129 };
 130 module_usb_driver(udl_driver);
 131 MODULE_LICENSE("GPL");