text: /*
   * HDMI Connector driver
   *
   * Copyright (C) 2013 Texas Instruments
   * Author: Tomi Valkeinen <tomi.valkeinen@ti.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.
   */
  
  #include <linux/gpio/consumer.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/of.h>
  #include <linux/of_gpio.h>
  
  #include <drm/drm_edid.h>
  
  #include <video/omapdss.h>
  #include <video/omap-panel-data.h>
  
  static const struct omap_video_timings hdmic_default_timings = {
  	.x_res		= 640,
  	.y_res		= 480,
  	.pixelclock	= 25175000,
  	.hsw		= 96,
  	.hfp		= 16,
  	.hbp		= 48,
  	.vsw		= 2,
  	.vfp		= 11,
  	.vbp		= 31,
  
  	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
  	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
  
  	.interlace	= false,
  };
  
  struct panel_drv_data {
  	struct omap_dss_device dssdev;
  	struct omap_dss_device *in;
  
  	struct device *dev;
  
  	struct omap_video_timings timings;
  
  	int hpd_gpio;
  };
  
  #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  
  static int hdmic_connect(struct omap_dss_device *dssdev)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  	int r;
  
  	dev_dbg(ddata->dev, "connect\n");
  
  	if (omapdss_device_is_connected(dssdev))
  		return 0;
  
  	r = in->ops.hdmi->connect(in, dssdev);
  	if (r)
  		return r;
  
  	return 0;
  }
  
  static void hdmic_disconnect(struct omap_dss_device *dssdev)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	dev_dbg(ddata->dev, "disconnect\n");
  
  	if (!omapdss_device_is_connected(dssdev))
  		return;
  
  	in->ops.hdmi->disconnect(in, dssdev);
  }
  
  static int hdmic_enable(struct omap_dss_device *dssdev)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  	int r;
  
  	dev_dbg(ddata->dev, "enable\n");
  
  	if (!omapdss_device_is_connected(dssdev))
  		return -ENODEV;
  
  	if (omapdss_device_is_enabled(dssdev))
  		return 0;
  
  	in->ops.hdmi->set_timings(in, &ddata->timings);
  
  	r = in->ops.hdmi->enable(in);
  	if (r)
  		return r;
  
  	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  
  	return r;
  }
  
  static void hdmic_disable(struct omap_dss_device *dssdev)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	dev_dbg(ddata->dev, "disable\n");
  
  	if (!omapdss_device_is_enabled(dssdev))
  		return;
  
  	in->ops.hdmi->disable(in);
  
  	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
  }
  
  static void hdmic_set_timings(struct omap_dss_device *dssdev,
  		struct omap_video_timings *timings)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	ddata->timings = *timings;
  	dssdev->panel.timings = *timings;
  
  	in->ops.hdmi->set_timings(in, timings);
  }
  
  static void hdmic_get_timings(struct omap_dss_device *dssdev,
  		struct omap_video_timings *timings)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  
  	*timings = ddata->timings;
  }
  
  static int hdmic_check_timings(struct omap_dss_device *dssdev,
  		struct omap_video_timings *timings)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	return in->ops.hdmi->check_timings(in, timings);
  }
  
  static int hdmic_read_edid(struct omap_dss_device *dssdev,
  		u8 *edid, int len)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	return in->ops.hdmi->read_edid(in, edid, len);
  }
  
  static bool hdmic_detect(struct omap_dss_device *dssdev)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	if (gpio_is_valid(ddata->hpd_gpio))
  		return gpio_get_value_cansleep(ddata->hpd_gpio);
  	else
  		return in->ops.hdmi->detect(in);
  }
  
  static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
  }
  
  static int hdmic_set_infoframe(struct omap_dss_device *dssdev,
  		const struct hdmi_avi_infoframe *avi)
  {
  	struct panel_drv_data *ddata = to_panel_data(dssdev);
  	struct omap_dss_device *in = ddata->in;
  
  	return in->ops.hdmi->set_infoframe(in, avi);
  }
  
  static struct omap_dss_driver hdmic_driver = {
  	.connect		= hdmic_connect,
  	.disconnect		= hdmic_disconnect,
  
  	.enable			= hdmic_enable,
  	.disable		= hdmic_disable,
  
  	.set_timings		= hdmic_set_timings,
  	.get_timings		= hdmic_get_timings,
  	.check_timings		= hdmic_check_timings,
  
  	.get_resolution		= omapdss_default_get_resolution,
  
  	.read_edid		= hdmic_read_edid,
  	.detect			= hdmic_detect,
  	.set_hdmi_mode		= hdmic_set_hdmi_mode,
  	.set_hdmi_infoframe	= hdmic_set_infoframe,
  };
  
  static int hdmic_probe_of(struct platform_device *pdev)
  {
  	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
  	struct device_node *node = pdev->dev.of_node;
  	struct omap_dss_device *in;
  	int gpio;
  
  	/* HPD GPIO */
  	gpio = of_get_named_gpio(node, "hpd-gpios", 0);
  	if (gpio_is_valid(gpio))
  		ddata->hpd_gpio = gpio;
  	else
  		ddata->hpd_gpio = -ENODEV;
  
  	in = omapdss_of_find_source_for_first_ep(node);
  	if (IS_ERR(in)) {
  		dev_err(&pdev->dev, "failed to find video source\n");
  		return PTR_ERR(in);
  	}
  
  	ddata->in = in;
  
  	return 0;
  }
  
  static int hdmic_probe(struct platform_device *pdev)
  {
  	struct panel_drv_data *ddata;
  	struct omap_dss_device *dssdev;
  	int r;
  
  	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
  	if (!ddata)
  		return -ENOMEM;
  
  	platform_set_drvdata(pdev, ddata);
  	ddata->dev = &pdev->dev;
  
  	if (!pdev->dev.of_node)
  		return -ENODEV;
  
  	r = hdmic_probe_of(pdev);
  	if (r)
  		return r;
  
  	if (gpio_is_valid(ddata->hpd_gpio)) {
  		r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
  				GPIOF_DIR_IN, "hdmi_hpd");
  		if (r)
  			goto err_reg;
  	}
  
  	ddata->timings = hdmic_default_timings;
  
  	dssdev = &ddata->dssdev;
  	dssdev->driver = &hdmic_driver;
  	dssdev->dev = &pdev->dev;
  	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
  	dssdev->owner = THIS_MODULE;
  	dssdev->panel.timings = hdmic_default_timings;
  
  	r = omapdss_register_display(dssdev);
  	if (r) {
  		dev_err(&pdev->dev, "Failed to register panel\n");
  		goto err_reg;
  	}
  
  	return 0;
  err_reg:
  	omap_dss_put_device(ddata->in);
  	return r;
  }
  
  static int __exit hdmic_remove(struct platform_device *pdev)
  {
  	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
  	struct omap_dss_device *dssdev = &ddata->dssdev;
  	struct omap_dss_device *in = ddata->in;
  
  	omapdss_unregister_display(&ddata->dssdev);
  
  	hdmic_disable(dssdev);
  	hdmic_disconnect(dssdev);
  
  	omap_dss_put_device(in);
  
  	return 0;
  }
  
  static const struct of_device_id hdmic_of_match[] = {
  	{ .compatible = "omapdss,hdmi-connector", },
  	{},
  };
  
  MODULE_DEVICE_TABLE(of, hdmic_of_match);
  
  static struct platform_driver hdmi_connector_driver = {
  	.probe	= hdmic_probe,
  	.remove	= __exit_p(hdmic_remove),
  	.driver	= {
  		.name	= "connector-hdmi",
  		.of_match_table = hdmic_of_match,
  		.suppress_bind_attrs = true,
  	},
  };
  
  module_platform_driver(hdmi_connector_driver);
  
  MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
  MODULE_DESCRIPTION("HDMI Connector driver");
  MODULE_LICENSE("GPL");
  