text: /*
   * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 and
   * only 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.
   */
  
  #include "dsi.h"
  
  struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi)
  {
  	if (!msm_dsi || !msm_dsi_device_connected(msm_dsi))
  		return NULL;
  
  	return msm_dsi->encoder;
  }
  
  static int dsi_get_phy(struct msm_dsi *msm_dsi)
  {
  	struct platform_device *pdev = msm_dsi->pdev;
  	struct platform_device *phy_pdev;
  	struct device_node *phy_node;
  
  	phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
  	if (!phy_node) {
  		dev_err(&pdev->dev, "cannot find phy device\n");
  		return -ENXIO;
  	}
  
  	phy_pdev = of_find_device_by_node(phy_node);
  	if (phy_pdev)
  		msm_dsi->phy = platform_get_drvdata(phy_pdev);
  
  	of_node_put(phy_node);
  
  	if (!phy_pdev || !msm_dsi->phy) {
  		dev_err(&pdev->dev, "%s: phy driver is not ready\n", __func__);
  		return -EPROBE_DEFER;
  	}
  
  	msm_dsi->phy_dev = get_device(&phy_pdev->dev);
  
  	return 0;
  }
  
  static void dsi_destroy(struct msm_dsi *msm_dsi)
  {
  	if (!msm_dsi)
  		return;
  
  	msm_dsi_manager_unregister(msm_dsi);
  
  	if (msm_dsi->phy_dev) {
  		put_device(msm_dsi->phy_dev);
  		msm_dsi->phy = NULL;
  		msm_dsi->phy_dev = NULL;
  	}
  
  	if (msm_dsi->host) {
  		msm_dsi_host_destroy(msm_dsi->host);
  		msm_dsi->host = NULL;
  	}
  
  	platform_set_drvdata(msm_dsi->pdev, NULL);
  }
  
  static struct msm_dsi *dsi_init(struct platform_device *pdev)
  {
  	struct msm_dsi *msm_dsi;
  	int ret;
  
  	if (!pdev)
  		return ERR_PTR(-ENXIO);
  
  	msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
  	if (!msm_dsi)
  		return ERR_PTR(-ENOMEM);
  	DBG("dsi probed=%p", msm_dsi);
  
  	msm_dsi->pdev = pdev;
  	platform_set_drvdata(pdev, msm_dsi);
  
  	/* Init dsi host */
  	ret = msm_dsi_host_init(msm_dsi);
  	if (ret)
  		goto destroy_dsi;
  
  	/* GET dsi PHY */
  	ret = dsi_get_phy(msm_dsi);
  	if (ret)
  		goto destroy_dsi;
  
  	/* Register to dsi manager */
  	ret = msm_dsi_manager_register(msm_dsi);
  	if (ret)
  		goto destroy_dsi;
  
  	return msm_dsi;
  
  destroy_dsi:
  	dsi_destroy(msm_dsi);
  	return ERR_PTR(ret);
  }
  
  static int dsi_bind(struct device *dev, struct device *master, void *data)
  {
  	struct drm_device *drm = dev_get_drvdata(master);
  	struct msm_drm_private *priv = drm->dev_private;
  	struct platform_device *pdev = to_platform_device(dev);
  	struct msm_dsi *msm_dsi;
  
  	DBG("");
  	msm_dsi = dsi_init(pdev);
  	if (IS_ERR(msm_dsi))
  		return PTR_ERR(msm_dsi);
  
  	priv->dsi[msm_dsi->id] = msm_dsi;
  
  	return 0;
  }
  
  static void dsi_unbind(struct device *dev, struct device *master,
  		void *data)
  {
  	struct drm_device *drm = dev_get_drvdata(master);
  	struct msm_drm_private *priv = drm->dev_private;
  	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
  	int id = msm_dsi->id;
  
  	if (priv->dsi[id]) {
  		dsi_destroy(msm_dsi);
  		priv->dsi[id] = NULL;
  	}
  }
  
  static const struct component_ops dsi_ops = {
  	.bind   = dsi_bind,
  	.unbind = dsi_unbind,
  };
  
  static int dsi_dev_probe(struct platform_device *pdev)
  {
  	return component_add(&pdev->dev, &dsi_ops);
  }
  
  static int dsi_dev_remove(struct platform_device *pdev)
  {
  	DBG("");
  	component_del(&pdev->dev, &dsi_ops);
  	return 0;
  }
  
  static const struct of_device_id dt_match[] = {
  	{ .compatible = "qcom,mdss-dsi-ctrl" },
  	{}
  };
  
  static const struct dev_pm_ops dsi_pm_ops = {
  	SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
  };
  
  static struct platform_driver dsi_driver = {
  	.probe = dsi_dev_probe,
  	.remove = dsi_dev_remove,
  	.driver = {
  		.name = "msm_dsi",
  		.of_match_table = dt_match,
  		.pm = &dsi_pm_ops,
  	},
  };
  
  void __init msm_dsi_register(void)
  {
  	DBG("");
  	msm_dsi_phy_driver_register();
  	platform_driver_register(&dsi_driver);
  }
  
  void __exit msm_dsi_unregister(void)
  {
  	DBG("");
  	msm_dsi_phy_driver_unregister();
  	platform_driver_unregister(&dsi_driver);
  }
  
  int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
  			 struct drm_encoder *encoder)
  {
  	struct msm_drm_private *priv;
  	struct drm_bridge *ext_bridge;
  	int ret;
  
  	if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
  		return -EINVAL;
  
  	priv = dev->dev_private;
  	msm_dsi->dev = dev;
  
  	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
  	if (ret) {
  		dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
  		goto fail;
  	}
  
  	msm_dsi->encoder = encoder;
  
  	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
  	if (IS_ERR(msm_dsi->bridge)) {
  		ret = PTR_ERR(msm_dsi->bridge);
  		dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
  		msm_dsi->bridge = NULL;
  		goto fail;
  	}
  
  	/*
  	 * check if the dsi encoder output is connected to a panel or an
  	 * external bridge. We create a connector only if we're connected to a
  	 * drm_panel device. When we're connected to an external bridge, we
  	 * assume that the drm_bridge driver will create the connector itself.
  	 */
  	ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
  
  	if (ext_bridge)
  		msm_dsi->connector =
  			msm_dsi_manager_ext_bridge_init(msm_dsi->id);
  	else
  		msm_dsi->connector =
  			msm_dsi_manager_connector_init(msm_dsi->id);
  
  	if (IS_ERR(msm_dsi->connector)) {
  		ret = PTR_ERR(msm_dsi->connector);
  		dev_err(dev->dev,
  			"failed to create dsi connector: %d\n", ret);
  		msm_dsi->connector = NULL;
  		goto fail;
  	}
  
  	priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
  	priv->connectors[priv->num_connectors++] = msm_dsi->connector;
  
  	return 0;
  fail:
  	/* bridge/connector are normally destroyed by drm: */
  	if (msm_dsi->bridge) {
  		msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
  		msm_dsi->bridge = NULL;
  	}
  
  	/* don't destroy connector if we didn't make it */
  	if (msm_dsi->connector && !msm_dsi->external_bridge)
  		msm_dsi->connector->funcs->destroy(msm_dsi->connector);
  
  	msm_dsi->connector = NULL;
  
  	return ret;
  }
  
  