1 files changed, 72 insertions, 3 deletions

diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index 92d1d0fb7b75..7223f06d8e58 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -109,8 +109,60 @@ err_g1:
 }
 EXPORT_SYMBOL(drm_get_platform_dev);
 
+static int drm_platform_get_irq(struct drm_device *dev)
+{
+        return platform_get_irq(dev->platformdev, 0);
+}
+
+static const char *drm_platform_get_name(struct drm_device *dev)
+{
+        return dev->platformdev->name;
+}
+
+static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
+{
+        int len, ret;
+
+        master->unique_len = 10 + strlen(dev->platformdev->name);
+        master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
+
+        if (master->unique == NULL)
+                return -ENOMEM;
+
+        len = snprintf(master->unique, master->unique_len,
+                       "platform:%s", dev->platformdev->name);
+
+        if (len > master->unique_len) {
+                DRM_ERROR("Unique buffer overflowed\n");
+                ret = -EINVAL;
+                goto err;
+        }
+
+        dev->devname =
+                kmalloc(strlen(dev->platformdev->name) +
+                        master->unique_len + 2, GFP_KERNEL);
+
+        if (dev->devname == NULL) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        sprintf(dev->devname, "%s@%s", dev->platformdev->name,
+                master->unique);
+        return 0;
+err:
+        return ret;
+}
+
+static struct drm_bus drm_platform_bus = {
+        .bus_type = DRIVER_BUS_PLATFORM,
+        .get_irq = drm_platform_get_irq,
+        .get_name = drm_platform_get_name,
+        .set_busid = drm_platform_set_busid,
+};
+
 /**
- * Platform device initialization. Called via drm_init at module load time,
+ * Platform device initialization. Called direct from modules.
  *
  * \return zero on success or a negative number on failure.
  *
@@ -121,7 +173,24 @@ EXPORT_SYMBOL(drm_get_platform_dev);
  * after the initialization for driver customization.
  */
 
-int drm_platform_init(struct drm_driver *driver)
+int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
 {
-        return drm_get_platform_dev(driver->platform_device, driver);
+        DRM_DEBUG("\n");
+
+        driver->kdriver.platform_device = platform_device;
+        driver->bus = &drm_platform_bus;
+        INIT_LIST_HEAD(&driver->device_list);
+        return drm_get_platform_dev(platform_device, driver);
+}
+EXPORT_SYMBOL(drm_platform_init);
+
+void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
+{
+        struct drm_device *dev, *tmp;
+        DRM_DEBUG("\n");
+
+        list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
+                drm_put_dev(dev);
+        DRM_INFO("Module unloaded\n");
 }
+EXPORT_SYMBOL(drm_platform_exit);