Implement direct pineview backlight control.

drivers/gpu/drm/i915/i915_drv.h

 /* i915_drv.h -- Private header for the I915 driver -*- linux-c -*-
  */
 /*
  *
  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ skipping 16 matching lines @@
  *
  */
 
 #ifndef _I915_DRV_H_
 #define _I915_DRV_H_
 
 #include "i915_reg.h"
 #include "intel_bios.h"
 #include <linux/io-mapping.h>
 
+#ifdef CONFIG_DRM_I915_DIRECT_BACKLIGHT
+#include <linux/backlight.h>
+#endif
+
 /* General customization:
  */
 
 #define DRIVER_AUTHOR           "Tungsten Graphics, Inc."
 
 #define DRIVER_NAME             "i915"
 #define DRIVER_DESC             "Intel Graphics"
 #define DRIVER_DATE             "20080730"
 
 enum pipe {
@@ skipping 536 matching lines @@
         bool lvds_downclock_avail;
         /* indicates the reduced downclock for LVDS*/
         int lvds_downclock;
         struct work_struct idle_work;
         struct timer_list idle_timer;
         bool busy;
         u16 orig_clock;
         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 */
 struct drm_i915_gem_object {
         struct drm_gem_object *obj;
 
         /** Current space allocated to this object in the GTT, if any. */
         struct drm_mm_node *gtt_space;
 
         /** This object's place on the active/flushing/inactive lists */
@@ skipping 329 matching lines @@
 extern void ironlake_opregion_gse_intr(struct drm_device *dev);
 extern void opregion_enable_asle(struct drm_device *dev);
 #else
 static inline int intel_opregion_init(struct drm_device *dev, int resume) { return 0; }
 static inline void intel_opregion_free(struct drm_device *dev, int suspend) { return; }
 static inline void opregion_asle_intr(struct drm_device *dev) { return; }
 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);
 extern int intel_modeset_vga_set_state(struct drm_device *dev, bool state);
 extern void i8xx_disable_fbc(struct drm_device *dev);
 extern void g4x_disable_fbc(struct drm_device *dev);
 
 /**
  * Lock test for when it's just for synchronization of ring access.
  *
@@ skipping 111 matching lines @@
 #define DSPARB_HWCONTROL(dev) (IS_G4X(dev) || IS_IRONLAKE(dev))
 
 #define HAS_FW_BLC(dev) (IS_I9XX(dev) || IS_G4X(dev) || IS_IRONLAKE(dev))
 #define HAS_PIPE_CXSR(dev) (INTEL_INFO(dev)->has_pipe_cxsr)
 #define I915_HAS_FBC(dev) (INTEL_INFO(dev)->has_fbc)
 #define I915_HAS_RC6(dev) (INTEL_INFO(dev)->has_rc6)
 
 #define PRIMARY_RINGBUFFER_SIZE         (128*1024)
 
 #endif