drm: rework PCI/platform driver interface.

This abstracts the pci/platform interface out a step further,
we can go further but this is far enough for now to allow USB
to be plugged in.

The drivers now just call the init code directly for their
device type.

Signed-off-by: Dave Airlie <airlied@redhat.com>

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);