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 const struct drm_driver driver = {
  54         .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
  55
  56         /* GEM hooks */
  57         .fops = &udl_driver_fops,
  58         DRM_GEM_SHMEM_DRIVER_OPS,
  59         .gem_prime_import = udl_driver_gem_prime_import,
  60
  61         .name = DRIVER_NAME,
  62         .desc = DRIVER_DESC,
  63         .date = DRIVER_DATE,
  64         .major = DRIVER_MAJOR,
  65         .minor = DRIVER_MINOR,
  66         .patchlevel = DRIVER_PATCHLEVEL,
  67 };
  68
  69 static struct udl_device *udl_driver_create(struct usb_interface *interface)
  70 {
  71         struct udl_device *udl;
  72         int r;
  73
  74         udl = devm_drm_dev_alloc(&interface->dev, &driver,
  75                                  struct udl_device, drm);
  76         if (IS_ERR(udl))
  77                 return udl;
  78
  79         r = udl_init(udl);
  80         if (r)
  81                 return ERR_PTR(r);
  82
  83         usb_set_intfdata(interface, udl);
  84
  85         return udl;
  86 }
  87
  88 static int udl_usb_probe(struct usb_interface *interface,
  89                          const struct usb_device_id *id)
  90 {
  91         int r;
  92         struct udl_device *udl;
  93
  94         udl = udl_driver_create(interface);
  95         if (IS_ERR(udl))
  96                 return PTR_ERR(udl);
  97
  98         r = drm_dev_register(&udl->drm, 0);
  99         if (r)
 100                 return r;
 101
 102         DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
 103
 104         drm_fbdev_generic_setup(&udl->drm, 0);
 105
 106         return 0;
 107 }
 108
 109 static void udl_usb_disconnect(struct usb_interface *interface)
 110 {
 111         struct drm_device *dev = usb_get_intfdata(interface);
 112
 113         drm_kms_helper_poll_fini(dev);
 114         udl_drop_usb(dev);
 115         drm_dev_unplug(dev);
 116 }
 117
 118 /*
 119  * There are many DisplayLink-based graphics products, all with unique PIDs.
 120  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 121  * We also require a match on SubClass (0x00) and Protocol (0x00),
 122  * which is compatible with all known USB 2.0 era graphics chips and firmware,
 123  * but allows DisplayLink to increment those for any future incompatible chips
 124  */
 125 static const struct usb_device_id id_table[] = {
 126         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 127          .bInterfaceSubClass = 0x00,
 128          .bInterfaceProtocol = 0x00,
 129          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 130                         USB_DEVICE_ID_MATCH_INT_CLASS |
 131                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 132                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 133         {},
 134 };
 135 MODULE_DEVICE_TABLE(usb, id_table);
 136
 137 static struct usb_driver udl_driver = {
 138         .name = "udl",
 139         .probe = udl_usb_probe,
 140         .disconnect = udl_usb_disconnect,
 141         .suspend = udl_usb_suspend,
 142         .resume = udl_usb_resume,
 143         .id_table = id_table,
 144 };
 145 module_usb_driver(udl_driver);
 146 MODULE_LICENSE("GPL");