1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_usb.c b/drivers/gpu/drm/drm_usb.c
new file mode 100644
index 00000000000..f2fe94aab90
--- /dev/null
+++ b/drivers/gpu/drm/drm_usb.c
@@ -0,0 +1,88 @@
+#include <drm/drmP.h>
+#include <drm/drm_usb.h>
+#include <linux/usb.h>
+#include <linux/module.h>
+
+int drm_get_usb_dev(struct usb_interface *interface,
+		    const struct usb_device_id *id,
+		    struct drm_driver *driver)
+{
+	struct drm_device *dev;
+	int ret;
+
+	DRM_DEBUG("\n");
+
+	dev = drm_dev_alloc(driver, &interface->dev);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->usbdev = interface_to_usbdev(interface);
+	usb_set_intfdata(interface, dev);
+
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		goto err_free;
+
+	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
+		 driver->name, driver->major, driver->minor, driver->patchlevel,
+		 driver->date, dev->primary->index);
+
+	return 0;
+
+err_free:
+	drm_dev_unref(dev);
+	return ret;
+
+}
+EXPORT_SYMBOL(drm_get_usb_dev);
+
+static int drm_usb_set_busid(struct drm_device *dev,
+			       struct drm_master *master)
+{
+	return 0;
+}
+
+static struct drm_bus drm_usb_bus = {
+	.set_busid = drm_usb_set_busid,
+};
+
+/**
+ * drm_usb_init - Register matching USB devices with the DRM subsystem
+ * @driver: DRM device driver
+ * @udriver: USB device driver
+ *
+ * Registers one or more devices matched by a USB driver with the DRM
+ * subsystem.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
+{
+	int res;
+	DRM_DEBUG("\n");
+
+	driver->bus = &drm_usb_bus;
+
+	res = usb_register(udriver);
+	return res;
+}
+EXPORT_SYMBOL(drm_usb_init);
+
+/**
+ * drm_usb_exit - Unregister matching USB devices from the DRM subsystem
+ * @driver: DRM device driver
+ * @udriver: USB device driver
+ *
+ * Unregisters one or more devices matched by a USB driver from the DRM
+ * subsystem.
+ */
+void drm_usb_exit(struct drm_driver *driver,
+		  struct usb_driver *udriver)
+{
+	usb_deregister(udriver);
+}
+EXPORT_SYMBOL(drm_usb_exit);
+
+MODULE_AUTHOR("David Airlie");
+MODULE_DESCRIPTION("USB DRM support");
+MODULE_LICENSE("GPL and additional rights");