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_drv.h>
   9 #include <drm/drm_client_setup.h>
  10 #include <drm/drm_fbdev_shmem.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_modeset_helper.h>
  15 #include <drm/drm_ioctl.h>
  16 #include <drm/drm_probe_helper.h>
  17 #include <drm/drm_print.h>
  18
  19 #include "udl_drv.h"
  20
  21 static int udl_usb_suspend(struct usb_interface *interface,
  22                            pm_message_t message)
  23 {
  24         struct drm_device *dev = usb_get_intfdata(interface);
  25         int ret;
  26
  27         ret = drm_mode_config_helper_suspend(dev);
  28         if (ret)
  29                 return ret;
  30
  31         udl_sync_pending_urbs(dev);
  32         return 0;
  33 }
  34
  35 static int udl_usb_resume(struct usb_interface *interface)
  36 {
  37         struct drm_device *dev = usb_get_intfdata(interface);
  38
  39         return drm_mode_config_helper_resume(dev);
  40 }
  41
  42 static int udl_usb_reset_resume(struct usb_interface *interface)
  43 {
  44         struct drm_device *dev = usb_get_intfdata(interface);
  45         struct udl_device *udl = to_udl(dev);
  46
  47         udl_select_std_channel(udl);
  48
  49         return drm_mode_config_helper_resume(dev);
  50 }
  51
  52 /*
  53  * FIXME: Dma-buf sharing requires DMA support by the importing device.
  54  *        This function is a workaround to make USB devices work as well.
  55  *        See todo.rst for how to fix the issue in the dma-buf framework.
  56  */
  57 static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
  58                                                           struct dma_buf *dma_buf)
  59 {
  60         struct udl_device *udl = to_udl(dev);
  61
  62         if (!udl->dmadev)
  63                 return ERR_PTR(-ENODEV);
  64
  65         return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
  66 }
  67
  68 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
  69
  70 static const struct drm_driver driver = {
  71         .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
  72
  73         /* GEM hooks */
  74         .fops = &udl_driver_fops,
  75         DRM_GEM_SHMEM_DRIVER_OPS,
  76         .gem_prime_import = udl_driver_gem_prime_import,
  77         DRM_FBDEV_SHMEM_DRIVER_OPS,
  78
  79         .name = DRIVER_NAME,
  80         .desc = DRIVER_DESC,
  81         .date = DRIVER_DATE,
  82         .major = DRIVER_MAJOR,
  83         .minor = DRIVER_MINOR,
  84         .patchlevel = DRIVER_PATCHLEVEL,
  85 };
  86
  87 static struct udl_device *udl_driver_create(struct usb_interface *interface)
  88 {
  89         struct udl_device *udl;
  90         int r;
  91
  92         udl = devm_drm_dev_alloc(&interface->dev, &driver,
  93                                  struct udl_device, drm);
  94         if (IS_ERR(udl))
  95                 return udl;
  96
  97         r = udl_init(udl);
  98         if (r)
  99                 return ERR_PTR(r);
 100
 101         usb_set_intfdata(interface, udl);
 102
 103         return udl;
 104 }
 105
 106 static int udl_usb_probe(struct usb_interface *interface,
 107                          const struct usb_device_id *id)
 108 {
 109         int r;
 110         struct udl_device *udl;
 111
 112         udl = udl_driver_create(interface);
 113         if (IS_ERR(udl))
 114                 return PTR_ERR(udl);
 115
 116         r = drm_dev_register(&udl->drm, 0);
 117         if (r)
 118                 return r;
 119
 120         DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
 121
 122         drm_client_setup(&udl->drm, NULL);
 123
 124         return 0;
 125 }
 126
 127 static void udl_usb_disconnect(struct usb_interface *interface)
 128 {
 129         struct drm_device *dev = usb_get_intfdata(interface);
 130
 131         drm_kms_helper_poll_fini(dev);
 132         udl_drop_usb(dev);
 133         drm_dev_unplug(dev);
 134 }
 135
 136 /*
 137  * There are many DisplayLink-based graphics products, all with unique PIDs.
 138  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 139  * We also require a match on SubClass (0x00) and Protocol (0x00),
 140  * which is compatible with all known USB 2.0 era graphics chips and firmware,
 141  * but allows DisplayLink to increment those for any future incompatible chips
 142  */
 143 static const struct usb_device_id id_table[] = {
 144         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 145          .bInterfaceSubClass = 0x00,
 146          .bInterfaceProtocol = 0x00,
 147          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 148                         USB_DEVICE_ID_MATCH_INT_CLASS |
 149                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 150                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 151         {},
 152 };
 153 MODULE_DEVICE_TABLE(usb, id_table);
 154
 155 static struct usb_driver udl_driver = {
 156         .name = "udl",
 157         .probe = udl_usb_probe,
 158         .disconnect = udl_usb_disconnect,
 159         .suspend = udl_usb_suspend,
 160         .resume = udl_usb_resume,
 161         .reset_resume = udl_usb_reset_resume,
 162         .id_table = id_table,
 163 };
 164 module_usb_driver(udl_driver);
 165 MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");
 166 MODULE_LICENSE("GPL");