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/clients/drm_client_setup.h>
   9 #include <drm/drm_drv.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         .major = DRIVER_MAJOR,
  82         .minor = DRIVER_MINOR,
  83         .patchlevel = DRIVER_PATCHLEVEL,
  84 };
  85
  86 static struct udl_device *udl_driver_create(struct usb_interface *interface)
  87 {
  88         struct udl_device *udl;
  89         int r;
  90
  91         udl = devm_drm_dev_alloc(&interface->dev, &driver,
  92                                  struct udl_device, drm);
  93         if (IS_ERR(udl))
  94                 return udl;
  95
  96         r = udl_init(udl);
  97         if (r)
  98                 return ERR_PTR(r);
  99
 100         usb_set_intfdata(interface, udl);
 101
 102         return udl;
 103 }
 104
 105 static int udl_usb_probe(struct usb_interface *interface,
 106                          const struct usb_device_id *id)
 107 {
 108         int r;
 109         struct udl_device *udl;
 110
 111         udl = udl_driver_create(interface);
 112         if (IS_ERR(udl))
 113                 return PTR_ERR(udl);
 114
 115         r = drm_dev_register(&udl->drm, 0);
 116         if (r)
 117                 return r;
 118
 119         DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
 120
 121         drm_client_setup(&udl->drm, NULL);
 122
 123         return 0;
 124 }
 125
 126 static void udl_usb_disconnect(struct usb_interface *interface)
 127 {
 128         struct drm_device *dev = usb_get_intfdata(interface);
 129
 130         drm_kms_helper_poll_fini(dev);
 131         udl_drop_usb(dev);
 132         drm_dev_unplug(dev);
 133 }
 134
 135 /*
 136  * There are many DisplayLink-based graphics products, all with unique PIDs.
 137  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 138  * We also require a match on SubClass (0x00) and Protocol (0x00),
 139  * which is compatible with all known USB 2.0 era graphics chips and firmware,
 140  * but allows DisplayLink to increment those for any future incompatible chips
 141  */
 142 static const struct usb_device_id id_table[] = {
 143         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 144          .bInterfaceSubClass = 0x00,
 145          .bInterfaceProtocol = 0x00,
 146          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 147                         USB_DEVICE_ID_MATCH_INT_CLASS |
 148                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 149                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 150         {},
 151 };
 152 MODULE_DEVICE_TABLE(usb, id_table);
 153
 154 static struct usb_driver udl_driver = {
 155         .name = "udl",
 156         .probe = udl_usb_probe,
 157         .disconnect = udl_usb_disconnect,
 158         .suspend = udl_usb_suspend,
 159         .resume = udl_usb_resume,
 160         .reset_resume = udl_usb_reset_resume,
 161         .id_table = id_table,
 162 };
 163 module_usb_driver(udl_driver);
 164 MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");
 165 MODULE_LICENSE("GPL");