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         .fops = &udl_driver_fops,
  42         DRM_GEM_SHMEM_DRIVER_OPS,
  43
  44         .name = DRIVER_NAME,
  45         .desc = DRIVER_DESC,
  46         .date = DRIVER_DATE,
  47         .major = DRIVER_MAJOR,
  48         .minor = DRIVER_MINOR,
  49         .patchlevel = DRIVER_PATCHLEVEL,
  50 };
  51
  52 static struct udl_device *udl_driver_create(struct usb_interface *interface)
  53 {
  54         struct udl_device *udl;
  55         int r;
  56
  57         udl = devm_drm_dev_alloc(&interface->dev, &driver,
  58                                  struct udl_device, drm);
  59         if (IS_ERR(udl))
  60                 return udl;
  61
  62         r = udl_init(udl);
  63         if (r)
  64                 return ERR_PTR(r);
  65
  66         usb_set_intfdata(interface, udl);
  67
  68         return udl;
  69 }
  70
  71 static int udl_usb_probe(struct usb_interface *interface,
  72                          const struct usb_device_id *id)
  73 {
  74         int r;
  75         struct udl_device *udl;
  76
  77         udl = udl_driver_create(interface);
  78         if (IS_ERR(udl))
  79                 return PTR_ERR(udl);
  80
  81         r = drm_dev_register(&udl->drm, 0);
  82         if (r)
  83                 return r;
  84
  85         DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
  86
  87         drm_fbdev_generic_setup(&udl->drm, 0);
  88
  89         return 0;
  90 }
  91
  92 static void udl_usb_disconnect(struct usb_interface *interface)
  93 {
  94         struct drm_device *dev = usb_get_intfdata(interface);
  95
  96         drm_kms_helper_poll_fini(dev);
  97         udl_drop_usb(dev);
  98         drm_dev_unplug(dev);
  99 }
 100
 101 /*
 102  * There are many DisplayLink-based graphics products, all with unique PIDs.
 103  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 104  * We also require a match on SubClass (0x00) and Protocol (0x00),
 105  * which is compatible with all known USB 2.0 era graphics chips and firmware,
 106  * but allows DisplayLink to increment those for any future incompatible chips
 107  */
 108 static const struct usb_device_id id_table[] = {
 109         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 110          .bInterfaceSubClass = 0x00,
 111          .bInterfaceProtocol = 0x00,
 112          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 113                         USB_DEVICE_ID_MATCH_INT_CLASS |
 114                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 115                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 116         {},
 117 };
 118 MODULE_DEVICE_TABLE(usb, id_table);
 119
 120 static struct usb_driver udl_driver = {
 121         .name = "udl",
 122         .probe = udl_usb_probe,
 123         .disconnect = udl_usb_disconnect,
 124         .suspend = udl_usb_suspend,
 125         .resume = udl_usb_resume,
 126         .id_table = id_table,
 127 };
 128 module_usb_driver(udl_driver);
 129 MODULE_LICENSE("GPL");