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