drivers/gpu/drm/drm_usb.c

   1 #include <drm/drmP.h>
   2 #include <drm/drm_usb.h>
   3 #include <linux/usb.h>
   4 #include <linux/module.h>
   5
   6 int drm_get_usb_dev(struct usb_interface *interface,
   7                     const struct usb_device_id *id,
   8                     struct drm_driver *driver)
   9 {
  10         struct drm_device *dev;
  11         int ret;
  12
  13         DRM_DEBUG("\n");
  14
  15         dev = drm_dev_alloc(driver, &interface->dev);
  16         if (!dev)
  17                 return -ENOMEM;
  18
  19         dev->usbdev = interface_to_usbdev(interface);
  20         usb_set_intfdata(interface, dev);
  21
  22         ret = drm_dev_register(dev, 0);
  23         if (ret)
  24                 goto err_free;
  25
  26         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
  27                  driver->name, driver->major, driver->minor, driver->patchlevel,
  28                  driver->date, dev->primary->index);
  29
  30         return 0;
  31
  32 err_free:
  33         drm_dev_unref(dev);
  34         return ret;
  35
  36 }
  37 EXPORT_SYMBOL(drm_get_usb_dev);
  38
  39 static int drm_usb_set_busid(struct drm_device *dev,
  40                                struct drm_master *master)
  41 {
  42         return 0;
  43 }
  44
  45 static struct drm_bus drm_usb_bus = {
  46         .set_busid = drm_usb_set_busid,
  47 };
  48
  49 /**
  50  * drm_usb_init - Register matching USB devices with the DRM subsystem
  51  * @driver: DRM device driver
  52  * @udriver: USB device driver
  53  *
  54  * Registers one or more devices matched by a USB driver with the DRM
  55  * subsystem.
  56  *
  57  * Return: 0 on success or a negative error code on failure.
  58  */
  59 int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
  60 {
  61         int res;
  62         DRM_DEBUG("\n");
  63
  64         driver->bus = &drm_usb_bus;
  65
  66         res = usb_register(udriver);
  67         return res;
  68 }
  69 EXPORT_SYMBOL(drm_usb_init);
  70
  71 /**
  72  * drm_usb_exit - Unregister matching USB devices from the DRM subsystem
  73  * @driver: DRM device driver
  74  * @udriver: USB device driver
  75  *
  76  * Unregisters one or more devices matched by a USB driver from the DRM
  77  * subsystem.
  78  */
  79 void drm_usb_exit(struct drm_driver *driver,
  80                   struct usb_driver *udriver)
  81 {
  82         usb_deregister(udriver);
  83 }
  84 EXPORT_SYMBOL(drm_usb_exit);
  85
  86 MODULE_AUTHOR("David Airlie");
  87 MODULE_DESCRIPTION("USB DRM support");
  88 MODULE_LICENSE("GPL and additional rights");