/*
 * Copyright (C) 2008 Maarten Maathuis.
 * 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
 * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 <acpi/button.h>

#include "drmP.h"
#include "drm_edid.h"
#include "drm_crtc_helper.h"

#include "nouveau_reg.h"
#include "nouveau_drv.h"
#include "nouveau_encoder.h"
#include "nouveau_crtc.h"
#include "nouveau_connector.h"
#include "nouveau_hw.h"

static struct nouveau_encoder *
find_encoder_by_type(struct drm_connector *connector, int type)
{
	struct drm_device *dev = connector->dev;
	struct nouveau_encoder *nv_encoder;
	struct drm_mode_object *obj;
	int i, id;

	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
		id = connector->encoder_ids[i];
		if (!id)
			break;

		obj = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
		if (!obj)
			continue;
		nv_encoder = nouveau_encoder(obj_to_encoder(obj));

		if (type == OUTPUT_ANY || nv_encoder->dcb->type == type)
			return nv_encoder;
	}

	return NULL;
}

struct nouveau_connector *
nouveau_encoder_connector_get(struct nouveau_encoder *encoder)
{
	struct drm_device *dev = to_drm_encoder(encoder)->dev;
	struct drm_connector *drm_connector;

	list_for_each_entry(drm_connector, &dev->mode_config.connector_list, head) {
		if (drm_connector->encoder == to_drm_encoder(encoder))
			return nouveau_connector(drm_connector);
	}

	return NULL;
}


static void
nouveau_connector_destroy(struct drm_connector *drm_connector)
{
	struct nouveau_connector *nv_connector =
		nouveau_connector(drm_connector);
	struct drm_device *dev;

	if (!nv_connector)
		return;

	dev = nv_connector->base.dev;
	NV_DEBUG_KMS(dev, "\n");

	kfree(nv_connector->edid);
	drm_sysfs_connector_remove(drm_connector);
	drm_connector_cleanup(drm_connector);
	kfree(drm_connector);
}

static struct nouveau_i2c_chan *
nouveau_connector_ddc_detect(struct drm_connector *connector,
			     struct nouveau_encoder **pnv_encoder)
{
	struct drm_device *dev = connector->dev;
	int i;

	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
		struct nouveau_i2c_chan *i2c = NULL;
		struct nouveau_encoder *nv_encoder;
		struct drm_mode_object *obj;
		int id;

		id = connector->encoder_ids[i];
		if (!id)
			break;

		obj = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
		if (!obj)
			continue;
		nv_encoder = nouveau_encoder(obj_to_encoder(obj));

		if (nv_encoder->dcb->i2c_index < 0xf)
			i2c = nouveau_i2c_find(dev, nv_encoder->dcb->i2c_index);

		if (i2c && nouveau_probe_i2c_addr(i2c, 0x50)) {
			*pnv_encoder = nv_encoder;
			return i2c;
		}
	}

	return NULL;
}

static void
nouveau_connector_set_encoder(struct drm_connector *connector,
			      struct nouveau_encoder *nv_encoder)
{
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct drm_nouveau_private *dev_priv = connector->dev->dev_private;
	struct drm_device *dev = connector->dev;

	if (nv_connector->detected_encoder == nv_encoder)
		return;
	nv_connector->detected_encoder = nv_encoder;

	if (nv_encoder->dcb->type == OUTPUT_LVDS ||
	    nv_encoder->dcb->type == OUTPUT_TMDS) {
		connector->doublescan_allowed = false;
		connector->interlace_allowed = false;
	} else {
		connector->doublescan_allowed = true;
		if (dev_priv->card_type == NV_20 ||
		   (dev_priv->card_type == NV_10 &&
		    (dev->pci_device & 0x0ff0) != 0x0100 &&
		    (dev->pci_device & 0x0ff0) != 0x0150))
			/* HW is broken */
			connector->interlace_allowed = false;
		else
			connector->interlace_allowed = true;
	}

	if (nv_connector->dcb->type == DCB_CONNECTOR_DVI_I) {
		drm_connector_property_set_value(connector,
			dev->mode_config.dvi_i_subconnector_property,
			nv_encoder->dcb->type == OUTPUT_TMDS ?
			DRM_MODE_SUBCONNECTOR_DVID :
			DRM_MODE_SUBCONNECTOR_DVIA);
	}
}

static enum drm_connector_status
nouveau_connector_detect(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_encoder *nv_encoder = NULL;
	struct nouveau_i2c_chan *i2c;
	int type;

	/* Cleanup the previous EDID block. */
	if (nv_connector->edid) {
		drm_mode_connector_update_edid_property(connector, NULL);
		kfree(nv_connector->edid);
		nv_connector->edid = NULL;
	}

	i2c = nouveau_connector_ddc_detect(connector, &nv_encoder);
	if (i2c) {
		nv_connector->edid = drm_get_edid(connector, &i2c->adapter);
		drm_mode_connector_update_edid_property(connector,
							nv_connector->edid);
		if (!nv_connector->edid) {
			NV_ERROR(dev, "DDC responded, but no EDID for %s\n",
				 drm_get_connector_name(connector));
			goto detect_analog;
		}

		if (nv_encoder->dcb->type == OUTPUT_DP &&
		    !nouveau_dp_detect(to_drm_encoder(nv_encoder))) {
			NV_ERROR(dev, "Detected %s, but failed init\n",
				 drm_get_connector_name(connector));
			return connector_status_disconnected;
		}

		/* Override encoder type for DVI-I based on whether EDID
		 * says the display is digital or analog, both use the
		 * same i2c channel so the value returned from ddc_detect
		 * isn't necessarily correct.
		 */
		if (nv_connector->dcb->type == DCB_CONNECTOR_DVI_I) {
			if (nv_connector->edid->input & DRM_EDID_INPUT_DIGITAL)
				type = OUTPUT_TMDS;
			else
				type = OUTPUT_ANALOG;

			nv_encoder = find_encoder_by_type(connector, type);
			if (!nv_encoder) {
				NV_ERROR(dev, "Detected %d encoder on %s, "
					      "but no object!\n", type,
					 drm_get_connector_name(connector));
				return connector_status_disconnected;
			}
		}

		nouveau_connector_set_encoder(connector, nv_encoder);
		return connector_status_connected;
	}

detect_analog:
	nv_encoder = find_encoder_by_type(connector, OUTPUT_ANALOG);
	if (!nv_encoder && !nouveau_tv_disable)
		nv_encoder = find_encoder_by_type(connector, OUTPUT_TV);
	if (nv_encoder) {
		struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
		struct drm_encoder_helper_funcs *helper =
						encoder->helper_private;

		if (helper->detect(encoder, connector) ==
						connector_status_connected) {
			nouveau_connector_set_encoder(connector, nv_encoder);
			return connector_status_connected;
		}

	}

	return connector_status_disconnected;
}

static enum drm_connector_status
nouveau_connector_detect_lvds(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_encoder *nv_encoder = NULL;
	enum drm_connector_status status = connector_status_disconnected;

	/* Cleanup the previous EDID block. */
	if (nv_connector->edid) {
		drm_mode_connector_update_edid_property(connector, NULL);
		kfree(nv_connector->edid);
		nv_connector->edid = NULL;
	}

	nv_encoder = find_encoder_by_type(connector, OUTPUT_LVDS);
	if (!nv_encoder)
		return connector_status_disconnected;

	/* Try retrieving EDID via DDC */
	if (!dev_priv->vbios.fp_no_ddc) {
		status = nouveau_connector_detect(connector);
		if (status == connector_status_connected)
			goto out;
	}

	/* On some laptops (Sony, i'm looking at you) there appears to
	 * be no direct way of accessing the panel's EDID.  The only
	 * option available to us appears to be to ask ACPI for help..
	 *
	 * It's important this check's before trying straps, one of the
	 * said manufacturer's laptops are configured in such a way
	 * the nouveau decides an entry in the VBIOS FP mode table is
	 * valid - it's not (rh#613284)
	 */
	if (nv_encoder->dcb->lvdsconf.use_acpi_for_edid) {
		if (!nouveau_acpi_edid(dev, connector)) {
			status = connector_status_connected;
			goto out;
		}
	}

	/* If no EDID found above, and the VBIOS indicates a hardcoded
	 * modeline is avalilable for the panel, set it as the panel's
	 * native mode and exit.
	 */
	if (nouveau_bios_fp_mode(dev, NULL) && (dev_priv->vbios.fp_no_ddc ||
	    nv_encoder->dcb->lvdsconf.use_straps_for_mode)) {
		status = connector_status_connected;
		goto out;
	}

	/* Still nothing, some VBIOS images have a hardcoded EDID block
	 * stored for the panel stored in them.
	 */
	if (!dev_priv->vbios.fp_no_ddc) {
		struct edid *edid =
			(struct edid *)nouveau_bios_embedded_edid(dev);
		if (edid) {
			nv_connector->edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
			*(nv_connector->edid) = *edid;
			status = connector_status_connected;
		}
	}

out:
#if defined(CONFIG_ACPI_BUTTON) || \
	(defined(CONFIG_ACPI_BUTTON_MODULE) && defined(MODULE))
	if (status == connector_status_connected &&
	    !nouveau_ignorelid && !acpi_lid_open())
		status = connector_status_unknown;
#endif

	drm_mode_connector_update_edid_property(connector, nv_connector->edid);
	nouveau_connector_set_encoder(connector, nv_encoder);
	return status;
}

static void
nouveau_connector_force(struct drm_connector *connector)
{
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_encoder *nv_encoder;
	int type;

	if (nv_connector->dcb->type == DCB_CONNECTOR_DVI_I) {
		if (connector->force == DRM_FORCE_ON_DIGITAL)
			type = OUTPUT_TMDS;
		else
			type = OUTPUT_ANALOG;
	} else
		type = OUTPUT_ANY;

	nv_encoder = find_encoder_by_type(connector, type);
	if (!nv_encoder) {
		NV_ERROR(connector->dev, "can't find encoder to force %s on!\n",
			 drm_get_connector_name(connector));
		connector->status = connector_status_disconnected;
		return;
	}

	nouveau_connector_set_encoder(connector, nv_encoder);
}

static int
nouveau_connector_set_property(struct drm_connector *connector,
			       struct drm_property *property, uint64_t value)
{
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
	struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
	struct drm_device *dev = connector->dev;
	int ret;

	/* Scaling mode */
	if (property == dev->mode_config.scaling_mode_property) {
		struct nouveau_crtc *nv_crtc = NULL;
		bool modeset = false;

		switch (value) {
		case DRM_MODE_SCALE_NONE:
		case DRM_MODE_SCALE_FULLSCREEN:
		case DRM_MODE_SCALE_CENTER:
		case DRM_MODE_SCALE_ASPECT:
			break;
		default:
			return -EINVAL;
		}

		/* LVDS always needs gpu scaling */
		if (nv_connector->dcb->type == DCB_CONNECTOR_LVDS &&
		    value == DRM_MODE_SCALE_NONE)
			return -EINVAL;

		/* Changing between GPU and panel scaling requires a full
		 * modeset
		 */
		if ((nv_connector->scaling_mode == DRM_MODE_SCALE_NONE) ||
		    (value == DRM_MODE_SCALE_NONE))
			modeset = true;
		nv_connector->scaling_mode = value;

		if (connector->encoder && connector->encoder->crtc)
			nv_crtc = nouveau_crtc(connector->encoder->crtc);
		if (!nv_crtc)
			return 0;

		if (modeset || !nv_crtc->set_scale) {
			ret = drm_crtc_helper_set_mode(&nv_crtc->base,
							&nv_crtc->base.mode,
							nv_crtc->base.x,
							nv_crtc->base.y, NULL);
			if (!ret)
				return -EINVAL;
		} else {
			ret = nv_crtc->set_scale(nv_crtc, value, true);
			if (ret)
				return ret;
		}

		return 0;
	}

	/* Dithering */
	if (property == dev->mode_config.dithering_mode_property) {
		struct nouveau_crtc *nv_crtc = NULL;

		if (value == DRM_MODE_DITHERING_ON)
			nv_connector->use_dithering = true;
		else
			nv_connector->use_dithering = false;

		if (connector->encoder && connector->encoder->crtc)
			nv_crtc = nouveau_crtc(connector->encoder->crtc);

		if (!nv_crtc || !nv_crtc->set_dither)
			return 0;

		return nv_crtc->set_dither(nv_crtc, nv_connector->use_dithering,
					   true);
	}

	if (nv_encoder && nv_encoder->dcb->type == OUTPUT_TV)
		return get_slave_funcs(encoder)->set_property(
			encoder, connector, property, value);

	return -EINVAL;
}

static struct drm_display_mode *
nouveau_connector_native_mode(struct drm_connector *connector)
{
	struct drm_connector_helper_funcs *helper = connector->helper_private;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct drm_device *dev = connector->dev;
	struct drm_display_mode *mode, *largest = NULL;
	int high_w = 0, high_h = 0, high_v = 0;

	list_for_each_entry(mode, &nv_connector->base.probed_modes, head) {
		if (helper->mode_valid(connector, mode) != MODE_OK ||
		    (mode->flags & DRM_MODE_FLAG_INTERLACE))
			continue;

		/* Use preferred mode if there is one.. */
		if (mode->type & DRM_MODE_TYPE_PREFERRED) {
			NV_DEBUG_KMS(dev, "native mode from preferred\n");
			return drm_mode_duplicate(dev, mode);
		}

		/* Otherwise, take the resolution with the largest width, then
		 * height, then vertical refresh
		 */
		if (mode->hdisplay < high_w)
			continue;

		if (mode->hdisplay == high_w && mode->vdisplay < high_h)
			continue;

		if (mode->hdisplay == high_w && mode->vdisplay == high_h &&
		    mode->vrefresh < high_v)
			continue;

		high_w = mode->hdisplay;
		high_h = mode->vdisplay;
		high_v = mode->vrefresh;
		largest = mode;
	}

	NV_DEBUG_KMS(dev, "native mode from largest: %dx%d@%d\n",
		      high_w, high_h, high_v);
	return largest ? drm_mode_duplicate(dev, largest) : NULL;
}

struct moderec {
	int hdisplay;
	int vdisplay;
};

static struct moderec scaler_modes[] = {
	{ 1920, 1200 },
	{ 1920, 1080 },
	{ 1680, 1050 },
	{ 1600, 1200 },
	{ 1400, 1050 },
	{ 1280, 1024 },
	{ 1280, 960 },
	{ 1152, 864 },
	{ 1024, 768 },
	{ 800, 600 },
	{ 720, 400 },
	{ 640, 480 },
	{ 640, 400 },
	{ 640, 350 },
	{}
};

static int
nouveau_connector_scaler_modes_add(struct drm_connector *connector)
{
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct drm_display_mode *native = nv_connector->native_mode, *m;
	struct drm_device *dev = connector->dev;
	struct moderec *mode = &scaler_modes[0];
	int modes = 0;

	if (!native)
		return 0;

	while (mode->hdisplay) {
		if (mode->hdisplay <= native->hdisplay &&
		    mode->vdisplay <= native->vdisplay) {
			m = drm_cvt_mode(dev, mode->hdisplay, mode->vdisplay,
					 drm_mode_vrefresh(native), false,
					 false, false);
			if (!m)
				continue;

			m->type |= DRM_MODE_TYPE_DRIVER;

			drm_mode_probed_add(connector, m);
			modes++;
		}

		mode++;
	}

	return modes;
}

static int
nouveau_connector_get_modes(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
	struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
	int ret = 0;

	/* destroy the native mode, the attached monitor could have changed.
	 */
	if (nv_connector->native_mode) {
		drm_mode_destroy(dev, nv_connector->native_mode);
		nv_connector->native_mode = NULL;
	}

	if (nv_connector->edid)
		ret = drm_add_edid_modes(connector, nv_connector->edid);
	else
	if (nv_encoder->dcb->type == OUTPUT_LVDS &&
	    (nv_encoder->dcb->lvdsconf.use_straps_for_mode ||
	     dev_priv->vbios.fp_no_ddc) && nouveau_bios_fp_mode(dev, NULL)) {
		nv_connector->native_mode = drm_mode_create(dev);
		nouveau_bios_fp_mode(dev, nv_connector->native_mode);
	}

	/* Find the native mode if this is a digital panel, if we didn't
	 * find any modes through DDC previously add the native mode to
	 * the list of modes.
	 */
	if (!nv_connector->native_mode)
		nv_connector->native_mode =
			nouveau_connector_native_mode(connector);
	if (ret == 0 && nv_connector->native_mode) {
		struct drm_display_mode *mode;

		mode = drm_mode_duplicate(dev, nv_connector->native_mode);
		drm_mode_probed_add(connector, mode);
		ret = 1;
	}

	if (nv_encoder->dcb->type == OUTPUT_TV)
		ret = get_slave_funcs(encoder)->get_modes(encoder, connector);

	if (nv_connector->dcb->type == DCB_CONNECTOR_LVDS ||
	    nv_connector->dcb->type == DCB_CONNECTOR_eDP)
		ret += nouveau_connector_scaler_modes_add(connector);

	return ret;
}

static int
nouveau_connector_mode_valid(struct drm_connector *connector,
			     struct drm_display_mode *mode)
{
	struct drm_nouveau_private *dev_priv = connector->dev->dev_private;
	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
	struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
	unsigned min_clock = 25000, max_clock = min_clock;
	unsigned clock = mode->clock;

	switch (nv_encoder->dcb->type) {
	case OUTPUT_LVDS:
		if (nv_connector->native_mode &&
		    (mode->hdisplay > nv_connector->native_mode->hdisplay ||
		     mode->vdisplay > nv_connector->native_mode->vdisplay))
			return MODE_PANEL;

		min_clock = 0;
		max_clock = 400000;
		break;
	case OUTPUT_TMDS:
		if ((dev_priv->card_type >= NV_50 && !nouveau_duallink) ||
		    !nv_encoder->dcb->duallink_possible)
			max_clock = 165000;
		else
			max_clock = 330000;
		break;
	case OUTPUT_ANALOG:
		max_clock = nv_encoder->dcb->crtconf.maxfreq;
		if (!max_clock)
			max_clock = 350000;
		break;
	case OUTPUT_TV:
		return get_slave_funcs(encoder)->mode_valid(encoder, mode);
	case OUTPUT_DP:
		if (nv_encoder->dp.link_bw == DP_LINK_BW_2_7)
			max_clock = nv_encoder->dp.link_nr * 270000;
		else
			max_clock = nv_encoder->dp.link_nr * 162000;

		clock *= 3;
		break;
	default:
		BUG_ON(1);
		return MODE_BAD;
	}

	if (clock < min_clock)
		return MODE_CLOCK_LOW;

	if (clock > max_clock)
		return MODE_CLOCK_HIGH;

	return MODE_OK;
}

static struct drm_encoder *
nouveau_connector_best_encoder(struct drm_connector *connector)
{
	struct nouveau_connector *nv_connector = nouveau_connector(connector);

	if (nv_connector->detected_encoder)
		return to_drm_encoder(nv_connector->detected_encoder);

	return NULL;
}

void
nouveau_connector_set_polling(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc;
	bool spare_crtc = false;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
		spare_crtc |= !crtc->enabled;

	connector->polled = 0;

	switch (connector->connector_type) {
	case DRM_MODE_CONNECTOR_VGA:
	case DRM_MODE_CONNECTOR_TV:
		if (dev_priv->card_type >= NV_50 ||
		    (nv_gf4_disp_arch(dev) && spare_crtc))
			connector->polled = DRM_CONNECTOR_POLL_CONNECT;
		break;

	case DRM_MODE_CONNECTOR_DVII:
	case DRM_MODE_CONNECTOR_DVID:
	case DRM_MODE_CONNECTOR_HDMIA:
	case DRM_MODE_CONNECTOR_DisplayPort:
	case DRM_MODE_CONNECTOR_eDP:
		if (dev_priv->card_type >= NV_50)
			connector->polled = DRM_CONNECTOR_POLL_HPD;
		else if (connector->connector_type == DRM_MODE_CONNECTOR_DVID ||
			 spare_crtc)
			connector->polled = DRM_CONNECTOR_POLL_CONNECT;
		break;

	default:
		break;
	}
}

static const struct drm_connector_helper_funcs
nouveau_connector_helper_funcs = {
	.get_modes = nouveau_connector_get_modes,
	.mode_valid = nouveau_connector_mode_valid,
	.best_encoder = nouveau_connector_best_encoder,
};

static const struct drm_connector_funcs
nouveau_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.save = NULL,
	.restore = NULL,
	.detect = nouveau_connector_detect,
	.destroy = nouveau_connector_destroy,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.set_property = nouveau_connector_set_property,
	.force = nouveau_connector_force
};

static const struct drm_connector_funcs
nouveau_connector_funcs_lvds = {
	.dpms = drm_helper_connector_dpms,
	.save = NULL,
	.restore = NULL,
	.detect = nouveau_connector_detect_lvds,
	.destroy = nouveau_connector_destroy,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.set_property = nouveau_connector_set_property,
	.force = nouveau_connector_force
};

struct drm_connector *
nouveau_connector_create(struct drm_device *dev, int index)
{
	const struct drm_connector_funcs *funcs = &nouveau_connector_funcs;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_connector *nv_connector = NULL;
	struct dcb_connector_table_entry *dcb = NULL;
	struct drm_connector *connector;
	int type, ret = 0;

	NV_DEBUG_KMS(dev, "\n");

	if (index >= dev_priv->vbios.dcb.connector.entries)
		return ERR_PTR(-EINVAL);

	dcb = &dev_priv->vbios.dcb.connector.entry[index];
	if (dcb->drm)
		return dcb->drm;

	switch (dcb->type) {
	case DCB_CONNECTOR_VGA:
		type = DRM_MODE_CONNECTOR_VGA;
		break;
	case DCB_CONNECTOR_TV_0:
	case DCB_CONNECTOR_TV_1:
	case DCB_CONNECTOR_TV_3:
		type = DRM_MODE_CONNECTOR_TV;
		break;
	case DCB_CONNECTOR_DVI_I:
		type = DRM_MODE_CONNECTOR_DVII;
		break;
	case DCB_CONNECTOR_DVI_D:
		type = DRM_MODE_CONNECTOR_DVID;
		break;
	case DCB_CONNECTOR_HDMI_0:
	case DCB_CONNECTOR_HDMI_1:
		type = DRM_MODE_CONNECTOR_HDMIA;
		break;
	case DCB_CONNECTOR_LVDS:
		type = DRM_MODE_CONNECTOR_LVDS;
		funcs = &nouveau_connector_funcs_lvds;
		break;
	case DCB_CONNECTOR_DP:
		type = DRM_MODE_CONNECTOR_DisplayPort;
		break;
	case DCB_CONNECTOR_eDP:
		type = DRM_MODE_CONNECTOR_eDP;
		break;
	default:
		NV_ERROR(dev, "unknown connector type: 0x%02x!!\n", dcb->type);
		return ERR_PTR(-EINVAL);
	}

	nv_connector = kzalloc(sizeof(*nv_connector), GFP_KERNEL);
	if (!nv_connector)
		return ERR_PTR(-ENOMEM);
	nv_connector->dcb = dcb;
	connector = &nv_connector->base;

	/* defaults, will get overridden in detect() */
	connector->interlace_allowed = false;
	connector->doublescan_allowed = false;

	drm_connector_init(dev, connector, funcs, type);
	drm_connector_helper_add(connector, &nouveau_connector_helper_funcs);

	/* Check if we need dithering enabled */
	if (dcb->type == DCB_CONNECTOR_LVDS) {
		bool dummy, is_24bit = false;

		ret = nouveau_bios_parse_lvds_table(dev, 0, &dummy, &is_24bit);
		if (ret) {
			NV_ERROR(dev, "Error parsing LVDS table, disabling "
				 "LVDS\n");
			goto fail;
		}

		nv_connector->use_dithering = !is_24bit;
	}

	/* Init DVI-I specific properties */
	if (dcb->type == DCB_CONNECTOR_DVI_I) {
		drm_mode_create_dvi_i_properties(dev);
		drm_connector_attach_property(connector, dev->mode_config.dvi_i_subconnector_property, 0);
		drm_connector_attach_property(connector, dev->mode_config.dvi_i_select_subconnector_property, 0);
	}

	switch (dcb->type) {
	case DCB_CONNECTOR_VGA:
		if (dev_priv->card_type >= NV_50) {
			drm_connector_attach_property(connector,
					dev->mode_config.scaling_mode_property,
					nv_connector->scaling_mode);
		}
		/* fall-through */
	case DCB_CONNECTOR_TV_0:
	case DCB_CONNECTOR_TV_1:
	case DCB_CONNECTOR_TV_3:
		nv_connector->scaling_mode = DRM_MODE_SCALE_NONE;
		break;
	default:
		nv_connector->scaling_mode = DRM_MODE_SCALE_FULLSCREEN;

		drm_connector_attach_property(connector,
				dev->mode_config.scaling_mode_property,
				nv_connector->scaling_mode);
		drm_connector_attach_property(connector,
				dev->mode_config.dithering_mode_property,
				nv_connector->use_dithering ?
				DRM_MODE_DITHERING_ON : DRM_MODE_DITHERING_OFF);
		break;
	}

	nouveau_connector_set_polling(connector);

	drm_sysfs_connector_add(connector);
	dcb->drm = connector;
	return dcb->drm;

fail:
	drm_connector_cleanup(connector);
	kfree(connector);
	return ERR_PTR(ret);

}