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 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
  36
  37 static struct drm_driver driver = {
  38         .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
  39
  40         /* gem hooks */
  41         .gem_create_object = udl_driver_gem_create_object,
  42
  43         .fops = &udl_driver_fops,
  44         DRM_GEM_SHMEM_DRIVER_OPS,
  45
  46         .name = DRIVER_NAME,
  47         .desc = DRIVER_DESC,
  48         .date = DRIVER_DATE,
  49         .major = DRIVER_MAJOR,
  50         .minor = DRIVER_MINOR,
  51         .patchlevel = DRIVER_PATCHLEVEL,
  52 };
  53
  54 static struct udl_device *udl_driver_create(struct usb_interface *interface)
  55 {
  56         struct usb_device *udev = interface_to_usbdev(interface);
  57         struct udl_device *udl;
  58         int r;
  59
  60         udl = kzalloc(sizeof(*udl), GFP_KERNEL);
  61         if (!udl)
  62                 return ERR_PTR(-ENOMEM);
  63
  64         r = drm_dev_init(&udl->drm, &driver, &interface->dev);
  65         if (r) {
  66                 kfree(udl);
  67                 return ERR_PTR(r);
  68         }
  69
  70         udl->udev = udev;
  71         udl->drm.dev_private = udl;
  72         drmm_add_final_kfree(&udl->drm, udl);
  73
  74         r = udl_init(udl);
  75         if (r) {
  76                 drm_dev_put(&udl->drm);
  77                 return ERR_PTR(r);
  78         }
  79
  80         usb_set_intfdata(interface, udl);
  81         return udl;
  82 }
  83
  84 static int udl_usb_probe(struct usb_interface *interface,
  85                          const struct usb_device_id *id)
  86 {
  87         int r;
  88         struct udl_device *udl;
  89
  90         udl = udl_driver_create(interface);
  91         if (IS_ERR(udl))
  92                 return PTR_ERR(udl);
  93
  94         r = drm_dev_register(&udl->drm, 0);
  95         if (r)
  96                 goto err_free;
  97
  98         DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
  99
 100         drm_fbdev_generic_setup(&udl->drm, 0);
 101
 102         return 0;
 103
 104 err_free:
 105         drm_dev_put(&udl->drm);
 106         return r;
 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         drm_dev_put(dev);
 117 }
 118
 119 /*
 120  * There are many DisplayLink-based graphics products, all with unique PIDs.
 121  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 122  * We also require a match on SubClass (0x00) and Protocol (0x00),
 123  * which is compatible with all known USB 2.0 era graphics chips and firmware,
 124  * but allows DisplayLink to increment those for any future incompatible chips
 125  */
 126 static const struct usb_device_id id_table[] = {
 127         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 128          .bInterfaceSubClass = 0x00,
 129          .bInterfaceProtocol = 0x00,
 130          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 131                         USB_DEVICE_ID_MATCH_INT_CLASS |
 132                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 133                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 134         {},
 135 };
 136 MODULE_DEVICE_TABLE(usb, id_table);
 137
 138 static struct usb_driver udl_driver = {
 139         .name = "udl",
 140         .probe = udl_usb_probe,
 141         .disconnect = udl_usb_disconnect,
 142         .suspend = udl_usb_suspend,
 143         .resume = udl_usb_resume,
 144         .id_table = id_table,
 145 };
 146 module_usb_driver(udl_driver);
 147 MODULE_LICENSE("GPL");