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