backlight: Allow properties to be passed at registration

Values such as max_brightness should be set before backlights are
registered, but the current API doesn't allow that. Add a parameter to
backlight_device_register and update drivers to ensure that they
set this correctly.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index 20564f8cb0e..406228f4a2a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -89,19 +89,21 @@ static struct backlight_ops nv50_bl_ops = {
 
 static int nouveau_nv40_backlight_init(struct drm_device *dev)
 {
+        struct backlight_properties props;
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct backlight_device *bd;
 
         if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
                 return 0;
 
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 31;
         bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
-                                       &nv40_bl_ops);
+                                       &nv40_bl_ops, &props);
         if (IS_ERR(bd))
                 return PTR_ERR(bd);
 
         dev_priv->backlight = bd;
-        bd->props.max_brightness = 31;
         bd->props.brightness = nv40_get_intensity(bd);
         backlight_update_status(bd);
 
@@ -110,19 +112,21 @@ static int nouveau_nv40_backlight_init(struct drm_device *dev)
 
 static int nouveau_nv50_backlight_init(struct drm_device *dev)
 {
+        struct backlight_properties props;
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct backlight_device *bd;
 
         if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
                 return 0;
 
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 1025;
         bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
-                                       &nv50_bl_ops);
+                                       &nv50_bl_ops, &props);
         if (IS_ERR(bd))
                 return PTR_ERR(bd);
 
         dev_priv->backlight = bd;
-        bd->props.max_brightness = 1025;
         bd->props.brightness = nv50_get_intensity(bd);
         backlight_update_status(bd);
         return 0;