Implement direct pineview backlight control.

drivers/gpu/drm/i915/i915_drv.h

Index: drivers/gpu/drm/i915/i915_drv.h
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b99b6a841d9506b1782562e825b383ac650aaf9c..6c82752a4935d7ec9e8425cbadcaf6feb3014618 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -34,6 +34,10 @@
 #include "intel_bios.h"
 #include <linux/io-mapping.h>
 
+#ifdef CONFIG_DRM_I915_DIRECT_BACKLIGHT
+#include <linux/backlight.h>
+#endif
+
 /* General customization:
  */
 
@@ -590,6 +594,12 @@ typedef struct drm_i915_private {
 	int child_dev_num;
 	struct child_device_config *child_dev;
 	struct drm_connector *int_lvds_connector;
+
+#ifdef CONFIG_DRM_I915_DIRECT_BACKLIGHT
+	/* direct backlight interface */
+	struct backlight_device *backlight;
+#endif
+
 } drm_i915_private_t;
 
 /** driver private structure attached to each drm_gem_object */
@@ -939,6 +949,15 @@ static inline void ironlake_opregion_gse_intr(struct drm_device *dev) { return;
 static inline void opregion_enable_asle(struct drm_device *dev) { return; }
 #endif
 
+#ifdef CONFIG_DRM_I915_DIRECT_BACKLIGHT
+/* i915_backlight.c */
+extern void i915_backlight_init(struct drm_device *dev);
+extern void i915_backlight_exit(struct drm_device *dev);
+#else
+extern inline void i915_backlight_init(struct drm_device *dev) { return; }
+extern inline void i915_backlight_exit(struct drm_device *dev) { return; }
+#endif
+
 /* modesetting */
 extern void intel_modeset_init(struct drm_device *dev);
 extern void intel_modeset_cleanup(struct drm_device *dev);