drm/i915: make backlight hooks connector specific

Previously we've relied on having basically one backlight and one
backlight type per platform. This is already a bit quirky with PMIC PWM
support on VLV/CHV platforms with MIPI DSI. In the foreseeable future
we'll have at least DPCD based backlight control on eDP and DCS command
based backlight control on MIPI DSI. Backlight is becoming more and more
connector specific, so reflect this fact by making the backlight control
hooks connector specific.

This enables further work to reuse generic backlight code in
intel_panel.c while adding more specific backlight code accessed via the
hooks.

Cc: Deepak M <m.deepak@intel.com>
Cc: Yetunde Adebisi <yetundex.adebisi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Deepak M <m.deepak@intel.com>
Reviewed-by: Yetunde Adebisi <yetundex.adebisi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index ed66a4f..1eaa9f9 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -182,9 +182,17 @@
 		struct pwm_device *pwm;
 
 		struct backlight_device *device;
-	} backlight;
 
-	void (*backlight_power)(struct intel_connector *, bool enable);
+		/* Connector and platform specific backlight functions */
+		int (*setup)(struct intel_connector *connector, enum pipe pipe);
+		uint32_t (*get)(struct intel_connector *connector);
+		void (*set)(struct intel_connector *connector, uint32_t level);
+		void (*disable)(struct intel_connector *connector);
+		void (*enable)(struct intel_connector *connector);
+		uint32_t (*hz_to_pwm)(struct intel_connector *connector,
+				      uint32_t hz);
+		void (*power)(struct intel_connector *, bool enable);
+	} backlight;
 };
 
 struct intel_connector {
@@ -1333,7 +1341,6 @@
 void intel_panel_enable_backlight(struct intel_connector *connector);
 void intel_panel_disable_backlight(struct intel_connector *connector);
 void intel_panel_destroy_backlight(struct drm_connector *connector);
-void intel_panel_init_backlight_funcs(struct drm_device *dev);
 enum drm_connector_status intel_panel_detect(struct drm_device *dev);
 extern struct drm_display_mode *intel_find_panel_downclock(
 				struct drm_device *dev,