text: /*
   * Copyright (C) 2014 Red Hat
   * Author: Rob Clark <robdclark@gmail.com>
   * Author: Vinay Simha <vinaysimha@inforcecomputing.com>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/gpio.h>
  
  #include "mdp4_kms.h"
  
  struct mdp4_lvds_connector {
  	struct drm_connector base;
  	struct drm_encoder *encoder;
  	struct device_node *panel_node;
  	struct drm_panel *panel;
  };
  #define to_mdp4_lvds_connector(x) container_of(x, struct mdp4_lvds_connector, base)
  
  static enum drm_connector_status mdp4_lvds_connector_detect(
  		struct drm_connector *connector, bool force)
  {
  	struct mdp4_lvds_connector *mdp4_lvds_connector =
  			to_mdp4_lvds_connector(connector);
  
  	if (!mdp4_lvds_connector->panel)
  		mdp4_lvds_connector->panel =
  			of_drm_find_panel(mdp4_lvds_connector->panel_node);
  
  	return mdp4_lvds_connector->panel ?
  			connector_status_connected :
  			connector_status_disconnected;
  }
  
  static void mdp4_lvds_connector_destroy(struct drm_connector *connector)
  {
  	struct mdp4_lvds_connector *mdp4_lvds_connector =
  			to_mdp4_lvds_connector(connector);
  
  	drm_connector_cleanup(connector);
  
  	kfree(mdp4_lvds_connector);
  }
  
  static int mdp4_lvds_connector_get_modes(struct drm_connector *connector)
  {
  	struct mdp4_lvds_connector *mdp4_lvds_connector =
  			to_mdp4_lvds_connector(connector);
  	struct drm_panel *panel = mdp4_lvds_connector->panel;
  	int ret = 0;
  
  	if (panel) {
  		drm_panel_attach(panel, connector);
  
  		ret = panel->funcs->get_modes(panel);
  
  		drm_panel_detach(panel);
  	}
  
  	return ret;
  }
  
  static int mdp4_lvds_connector_mode_valid(struct drm_connector *connector,
  				 struct drm_display_mode *mode)
  {
  	struct mdp4_lvds_connector *mdp4_lvds_connector =
  			to_mdp4_lvds_connector(connector);
  	struct drm_encoder *encoder = mdp4_lvds_connector->encoder;
  	long actual, requested;
  
  	requested = 1000 * mode->clock;
  	actual = mdp4_lcdc_round_pixclk(encoder, requested);
  
  	DBG("requested=%ld, actual=%ld", requested, actual);
  
  	if (actual != requested)
  		return MODE_CLOCK_RANGE;
  
  	return MODE_OK;
  }
  
  static const struct drm_connector_funcs mdp4_lvds_connector_funcs = {
  	.dpms = drm_atomic_helper_connector_dpms,
  	.detect = mdp4_lvds_connector_detect,
  	.fill_modes = drm_helper_probe_single_connector_modes,
  	.destroy = mdp4_lvds_connector_destroy,
  	.reset = drm_atomic_helper_connector_reset,
  	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  };
  
  static const struct drm_connector_helper_funcs mdp4_lvds_connector_helper_funcs = {
  	.get_modes = mdp4_lvds_connector_get_modes,
  	.mode_valid = mdp4_lvds_connector_mode_valid,
  };
  
  /* initialize connector */
  struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
  		struct device_node *panel_node, struct drm_encoder *encoder)
  {
  	struct drm_connector *connector = NULL;
  	struct mdp4_lvds_connector *mdp4_lvds_connector;
  
  	mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
  	if (!mdp4_lvds_connector)
  		return ERR_PTR(-ENOMEM);
  
  	mdp4_lvds_connector->encoder = encoder;
  	mdp4_lvds_connector->panel_node = panel_node;
  
  	connector = &mdp4_lvds_connector->base;
  
  	drm_connector_init(dev, connector, &mdp4_lvds_connector_funcs,
  			DRM_MODE_CONNECTOR_LVDS);
  	drm_connector_helper_add(connector, &mdp4_lvds_connector_helper_funcs);
  
  	connector->polled = 0;
  
  	connector->interlace_allowed = 0;
  	connector->doublescan_allowed = 0;
  
  	drm_mode_connector_attach_encoder(connector, encoder);
  
  	return connector;
  }
  