/*
 * rcar_du_lvds.c  --  R-Car Display Unit LVDS Encoder and Connector
 *
 * Copyright (C) 2013 Renesas Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>

#include "rcar_du_drv.h"
#include "rcar_du_kms.h"
#include "rcar_du_lvds.h"

struct rcar_du_lvds_connector {
	struct rcar_du_connector connector;

	const struct rcar_du_panel_data *panel;
};

#define to_rcar_lvds_connector(c) \
	container_of(c, struct rcar_du_lvds_connector, connector.connector)

/* -----------------------------------------------------------------------------
 * Connector
 */

static int rcar_du_lvds_connector_get_modes(struct drm_connector *connector)
{
	struct rcar_du_lvds_connector *lvdscon = to_rcar_lvds_connector(connector);
	struct drm_display_mode *mode;

	mode = drm_mode_create(connector->dev);
	if (mode == NULL)
		return 0;

	mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
	mode->clock = lvdscon->panel->mode.clock;
	mode->hdisplay = lvdscon->panel->mode.hdisplay;
	mode->hsync_start = lvdscon->panel->mode.hsync_start;
	mode->hsync_end = lvdscon->panel->mode.hsync_end;
	mode->htotal = lvdscon->panel->mode.htotal;
	mode->vdisplay = lvdscon->panel->mode.vdisplay;
	mode->vsync_start = lvdscon->panel->mode.vsync_start;
	mode->vsync_end = lvdscon->panel->mode.vsync_end;
	mode->vtotal = lvdscon->panel->mode.vtotal;
	mode->flags = lvdscon->panel->mode.flags;

	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);

	return 1;
}

static int rcar_du_lvds_connector_mode_valid(struct drm_connector *connector,
					    struct drm_display_mode *mode)
{
	return MODE_OK;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
	.get_modes = rcar_du_lvds_connector_get_modes,
	.mode_valid = rcar_du_lvds_connector_mode_valid,
	.best_encoder = rcar_du_connector_best_encoder,
};

static void rcar_du_lvds_connector_destroy(struct drm_connector *connector)
{
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
}

static enum drm_connector_status
rcar_du_lvds_connector_detect(struct drm_connector *connector, bool force)
{
	return connector_status_connected;
}

static const struct drm_connector_funcs connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = rcar_du_lvds_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = rcar_du_lvds_connector_destroy,
};

static int rcar_du_lvds_connector_init(struct rcar_du_device *rcdu,
				       struct rcar_du_encoder *renc,
				       const struct rcar_du_panel_data *panel)
{
	struct rcar_du_lvds_connector *lvdscon;
	struct drm_connector *connector;
	int ret;

	lvdscon = devm_kzalloc(rcdu->dev, sizeof(*lvdscon), GFP_KERNEL);
	if (lvdscon == NULL)
		return -ENOMEM;

	lvdscon->panel = panel;

	connector = &lvdscon->connector.connector;
	connector->display_info.width_mm = panel->width_mm;
	connector->display_info.height_mm = panel->height_mm;

	ret = drm_connector_init(rcdu->ddev, connector, &connector_funcs,
				 DRM_MODE_CONNECTOR_LVDS);
	if (ret < 0)
		return ret;

	drm_connector_helper_add(connector, &connector_helper_funcs);
	ret = drm_sysfs_connector_add(connector);
	if (ret < 0)
		return ret;

	drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
	drm_object_property_set_value(&connector->base,
		rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);

	ret = drm_mode_connector_attach_encoder(connector, &renc->encoder);
	if (ret < 0)
		return ret;

	connector->encoder = &renc->encoder;
	lvdscon->connector.encoder = renc;

	return 0;
}

/* -----------------------------------------------------------------------------
 * Encoder
 */

static void rcar_du_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
{
}

static bool rcar_du_lvds_encoder_mode_fixup(struct drm_encoder *encoder,
					   const struct drm_display_mode *mode,
					   struct drm_display_mode *adjusted_mode)
{
	const struct drm_display_mode *panel_mode;
	struct drm_device *dev = encoder->dev;
	struct drm_connector *connector;
	bool found = false;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		if (connector->encoder == encoder) {
			found = true;
			break;
		}
	}

	if (!found) {
		dev_dbg(dev->dev, "mode_fixup: no connector found\n");
		return false;
	}

	if (list_empty(&connector->modes)) {
		dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
		return false;
	}

	panel_mode = list_first_entry(&connector->modes,
				      struct drm_display_mode, head);

	/* We're not allowed to modify the resolution. */
	if (mode->hdisplay != panel_mode->hdisplay ||
	    mode->vdisplay != panel_mode->vdisplay)
		return false;

	/* The flat panel mode is fixed, just copy it to the adjusted mode. */
	drm_mode_copy(adjusted_mode, panel_mode);

	return true;
}

static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	.dpms = rcar_du_lvds_encoder_dpms,
	.mode_fixup = rcar_du_lvds_encoder_mode_fixup,
	.prepare = rcar_du_encoder_mode_prepare,
	.commit = rcar_du_encoder_mode_commit,
	.mode_set = rcar_du_encoder_mode_set,
};

static const struct drm_encoder_funcs encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

int rcar_du_lvds_init(struct rcar_du_device *rcdu,
		      const struct rcar_du_encoder_lvds_data *data,
		      unsigned int output)
{
	struct rcar_du_encoder *renc;
	int ret;

	renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
	if (renc == NULL)
		return -ENOMEM;

	renc->output = output;

	ret = drm_encoder_init(rcdu->ddev, &renc->encoder, &encoder_funcs,
			       DRM_MODE_ENCODER_LVDS);
	if (ret < 0)
		return ret;

	drm_encoder_helper_add(&renc->encoder, &encoder_helper_funcs);

	return rcar_du_lvds_connector_init(rcdu, renc, &data->panel);
}