text: /*
   * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   * Copyright (c) 2007, 2010 Intel Corporation
   *   Jesse Barnes <jesse.barnes@intel.com>
   *
   * 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 without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  #include <linux/slab.h>
  #include <linux/i2c.h>
  #include <linux/fb.h>
  #include <drm/drm_edid.h>
  #include "drmP.h"
  #include "drm_edid.h"
  #include "intel_drv.h"
  #include "i915_drv.h"
  
  /**
   * intel_ddc_probe
   *
   */
  bool intel_ddc_probe(struct intel_encoder *intel_encoder, int ddc_bus)
  {
  	struct drm_i915_private *dev_priv = intel_encoder->base.dev->dev_private;
  	u8 out_buf[] = { 0x0, 0x0};
  	u8 buf[2];
  	struct i2c_msg msgs[] = {
  		{
  			.addr = DDC_ADDR,
  			.flags = 0,
  			.len = 1,
  			.buf = out_buf,
  		},
  		{
  			.addr = DDC_ADDR,
  			.flags = I2C_M_RD,
  			.len = 1,
  			.buf = buf,
  		}
  	};
  
  	return i2c_transfer(&dev_priv->gmbus[ddc_bus].adapter, msgs, 2) == 2;
  }
  
  /**
   * intel_ddc_get_modes - get modelist from monitor
   * @connector: DRM connector device to use
   * @adapter: i2c adapter
   *
   * Fetch the EDID information from @connector using the DDC bus.
   */
  int intel_ddc_get_modes(struct drm_connector *connector,
  			struct i2c_adapter *adapter)
  {
  	struct edid *edid;
  	int ret = 0;
  
  	edid = drm_get_edid(connector, adapter);
  	if (edid) {
  		drm_mode_connector_update_edid_property(connector, edid);
  		ret = drm_add_edid_modes(connector, edid);
  		drm_edid_to_eld(connector, edid);
  		connector->display_info.raw_edid = NULL;
  		kfree(edid);
  	}
  
  	return ret;
  }
  
  static const struct drm_prop_enum_list force_audio_names[] = {
  	{ HDMI_AUDIO_OFF_DVI, "force-dvi" },
  	{ HDMI_AUDIO_OFF, "off" },
  	{ HDMI_AUDIO_AUTO, "auto" },
  	{ HDMI_AUDIO_ON, "on" },
  };
  
  void
  intel_attach_force_audio_property(struct drm_connector *connector)
  {
  	struct drm_device *dev = connector->dev;
  	struct drm_i915_private *dev_priv = dev->dev_private;
  	struct drm_property *prop;
  
  	prop = dev_priv->force_audio_property;
  	if (prop == NULL) {
  		prop = drm_property_create_enum(dev, 0,
  					   "audio",
  					   force_audio_names,
  					   ARRAY_SIZE(force_audio_names));
  		if (prop == NULL)
  			return;
  
  		dev_priv->force_audio_property = prop;
  	}
  	drm_connector_attach_property(connector, prop, 0);
  }
  
  static const struct drm_prop_enum_list broadcast_rgb_names[] = {
  	{ 0, "Full" },
  	{ 1, "Limited 16:235" },
  };
  
  void
  intel_attach_broadcast_rgb_property(struct drm_connector *connector)
  {
  	struct drm_device *dev = connector->dev;
  	struct drm_i915_private *dev_priv = dev->dev_private;
  	struct drm_property *prop;
  
  	prop = dev_priv->broadcast_rgb_property;
  	if (prop == NULL) {
  		prop = drm_property_create_enum(dev, DRM_MODE_PROP_ENUM,
  					   "Broadcast RGB",
  					   broadcast_rgb_names,
  					   ARRAY_SIZE(broadcast_rgb_names));
  		if (prop == NULL)
  			return;
  
  		dev_priv->broadcast_rgb_property = prop;
  	}
  
  	drm_connector_attach_property(connector, prop, 0);
  }
  