drivers/gpu/drm/bridge/ti-tfp410.c - linux - Git at Google

 /*
  * Copyright (C) 2016 Texas Instruments
  * Author: Jyri Sarha <jsarha@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/module.h>
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>

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

 struct tfp410 {
 	struct drm_bridge	bridge;
 	struct drm_connector	connector;

 	struct i2c_adapter	*ddc;

 	struct device *dev;
 };

 static inline struct tfp410 *
 drm_bridge_to_tfp410(struct drm_bridge *bridge)
 {
 	return container_of(bridge, struct tfp410, bridge);
 }

 static inline struct tfp410 *
 drm_connector_to_tfp410(struct drm_connector *connector)
 {
 	return container_of(connector, struct tfp410, connector);
 }

 static int tfp410_get_modes(struct drm_connector *connector)
 {
 	struct tfp410 *dvi = drm_connector_to_tfp410(connector);
 	struct edid *edid;
 	int ret;

 	if (!dvi->ddc)
 		goto fallback;

 	edid = drm_get_edid(connector, dvi->ddc);
 	if (!edid) {
 		DRM_INFO("EDID read failed. Fallback to standard modes\n");
 		goto fallback;
 	}

 	drm_mode_connector_update_edid_property(connector, edid);

 	return drm_add_edid_modes(connector, edid);
 fallback:
 	/* No EDID, fallback on the XGA standard modes */
 	ret = drm_add_modes_noedid(connector, 1920, 1200);

 	/* And prefer a mode pretty much anything can handle */
 	drm_set_preferred_mode(connector, 1024, 768);

 	return ret;
 }

 static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
 	.get_modes	= tfp410_get_modes,
 };

 static enum drm_connector_status
 tfp410_connector_detect(struct drm_connector *connector, bool force)
 {
 	struct tfp410 *dvi = drm_connector_to_tfp410(connector);

 	if (dvi->ddc) {
 		if (drm_probe_ddc(dvi->ddc))
 			return connector_status_connected;
 		else
 			return connector_status_disconnected;
 	}

 	return connector_status_unknown;
 }

 static const struct drm_connector_funcs tfp410_con_funcs = {
 	.dpms			= drm_atomic_helper_connector_dpms,
 	.detect			= tfp410_connector_detect,
 	.fill_modes		= drm_helper_probe_single_connector_modes,
 	.destroy		= drm_connector_cleanup,
 	.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 int tfp410_attach(struct drm_bridge *bridge)
 {
 	struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
 	int ret;

 	if (!bridge->encoder) {
 		dev_err(dvi->dev, "Missing encoder\n");
 		return -ENODEV;
 	}

 	drm_connector_helper_add(&dvi->connector,
 				 &tfp410_con_helper_funcs);
 	ret = drm_connector_init(bridge->dev, &dvi->connector,
 				 &tfp410_con_funcs, DRM_MODE_CONNECTOR_HDMIA);
 	if (ret) {
 		dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
 		return ret;
 	}

 	drm_mode_connector_attach_encoder(&dvi->connector,
 					  bridge->encoder);

 	return 0;
 }

 static const struct drm_bridge_funcs tfp410_bridge_funcs = {
 	.attach		= tfp410_attach,
 };

 static int tfp410_get_connector_ddc(struct tfp410 *dvi)
 {
 	struct device_node *ep = NULL, *connector_node = NULL;
 	struct device_node *ddc_phandle = NULL;
 	int ret = 0;

 	/* port@1 is the connector node */
 	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
 	if (!ep)
 		goto fail;

 	connector_node = of_graph_get_remote_port_parent(ep);
 	if (!connector_node)
 		goto fail;

 	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
 	if (!ddc_phandle)
 		goto fail;

 	dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
 	if (dvi->ddc)
 		dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
 	else
 		ret = -EPROBE_DEFER;

 fail:
 	of_node_put(ep);
 	of_node_put(connector_node);
 	of_node_put(ddc_phandle);
 	return ret;
 }

 static int tfp410_init(struct device *dev)
 {
 	struct tfp410 *dvi;
 	int ret;

 	if (!dev->of_node) {
 		dev_err(dev, "device-tree data is missing\n");
 		return -ENXIO;
 	}

 	dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
 	if (!dvi)
 		return -ENOMEM;
 	dev_set_drvdata(dev, dvi);

 	dvi->bridge.funcs = &tfp410_bridge_funcs;
 	dvi->bridge.of_node = dev->of_node;
 	dvi->dev = dev;

 	ret = tfp410_get_connector_ddc(dvi);
 	if (ret)
 		goto fail;

 	ret = drm_bridge_add(&dvi->bridge);
 	if (ret) {
 		dev_err(dev, "drm_bridge_add() failed: %d\n", ret);
 		goto fail;
 	}

 	return 0;
 fail:
 	i2c_put_adapter(dvi->ddc);
 	return ret;
 }

 static int tfp410_fini(struct device *dev)
 {
 	struct tfp410 *dvi = dev_get_drvdata(dev);

 	drm_bridge_remove(&dvi->bridge);

 	if (dvi->ddc)
 		i2c_put_adapter(dvi->ddc);

 	return 0;
 }

 static int tfp410_probe(struct platform_device *pdev)
 {
 	return tfp410_init(&pdev->dev);
 }

 static int tfp410_remove(struct platform_device *pdev)
 {
 	return tfp410_fini(&pdev->dev);
 }

 static const struct of_device_id tfp410_match[] = {
 	{ .compatible = "ti,tfp410" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, tfp410_match);

 struct platform_driver tfp410_platform_driver = {
 	.probe	= tfp410_probe,
 	.remove	= tfp410_remove,
 	.driver	= {
 		.name		= "tfp410-bridge",
 		.of_match_table	= tfp410_match,
 	},
 };

 #if IS_ENABLED(CONFIG_I2C)
 /* There is currently no i2c functionality. */
 static int tfp410_i2c_probe(struct i2c_client *client,
 			    const struct i2c_device_id *id)
 {
 	int reg;

 	if (!client->dev.of_node ||
 	    of_property_read_u32(client->dev.of_node, "reg", &reg)) {
 		dev_err(&client->dev,
 			"Can't get i2c reg property from device-tree\n");
 		return -ENXIO;
 	}

 	return tfp410_init(&client->dev);
 }

 static int tfp410_i2c_remove(struct i2c_client *client)
 {
 	return tfp410_fini(&client->dev);
 }

 static const struct i2c_device_id tfp410_i2c_ids[] = {
 	{ "tfp410", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);

 static struct i2c_driver tfp410_i2c_driver = {
 	.driver = {
 		.name	= "tfp410",
 		.of_match_table = of_match_ptr(tfp410_match),
 	},
 	.id_table	= tfp410_i2c_ids,
 	.probe		= tfp410_i2c_probe,
 	.remove		= tfp410_i2c_remove,
 };
 #endif /* IS_ENABLED(CONFIG_I2C) */

 static struct {
 	uint i2c:1;
 	uint platform:1;
 }  tfp410_registered_driver;

 static int __init tfp410_module_init(void)
 {
 	int ret;

 #if IS_ENABLED(CONFIG_I2C)
 	ret = i2c_add_driver(&tfp410_i2c_driver);
 	if (ret)
 		pr_err("%s: registering i2c driver failed: %d",
 		       __func__, ret);
 	else
 		tfp410_registered_driver.i2c = 1;
 #endif

 	ret = platform_driver_register(&tfp410_platform_driver);
 	if (ret)
 		pr_err("%s: registering platform driver failed: %d",
 		       __func__, ret);
 	else
 		tfp410_registered_driver.platform = 1;

 	if (tfp410_registered_driver.i2c ||
 	    tfp410_registered_driver.platform)
 		return 0;

 	return ret;
 }
 module_init(tfp410_module_init);

 static void __exit tfp410_module_exit(void)
 {
 #if IS_ENABLED(CONFIG_I2C)
 	if (tfp410_registered_driver.i2c)
 		i2c_del_driver(&tfp410_i2c_driver);
 #endif
 	if (tfp410_registered_driver.platform)
 		platform_driver_unregister(&tfp410_platform_driver);
 }
 module_exit(tfp410_module_exit);

 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2016 Texas Instruments
	* Author: Jyri Sarha <jsarha@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/module.h>
	#include <linux/of_graph.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>

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

	struct tfp410 {
	struct drm_bridge bridge;
	struct drm_connector connector;

	struct i2c_adapter *ddc;

	struct device *dev;
	};

	static inline struct tfp410 *
	drm_bridge_to_tfp410(struct drm_bridge *bridge)
	{
	return container_of(bridge, struct tfp410, bridge);
	}

	static inline struct tfp410 *
	drm_connector_to_tfp410(struct drm_connector *connector)
	{
	return container_of(connector, struct tfp410, connector);
	}

	static int tfp410_get_modes(struct drm_connector *connector)
	{
	struct tfp410 *dvi = drm_connector_to_tfp410(connector);
	struct edid *edid;
	int ret;

	if (!dvi->ddc)
	goto fallback;

	edid = drm_get_edid(connector, dvi->ddc);
	if (!edid) {
	DRM_INFO("EDID read failed. Fallback to standard modes\n");
	goto fallback;
	}

	drm_mode_connector_update_edid_property(connector, edid);

	return drm_add_edid_modes(connector, edid);
	fallback:
	/* No EDID, fallback on the XGA standard modes */
	ret = drm_add_modes_noedid(connector, 1920, 1200);

	/* And prefer a mode pretty much anything can handle */
	drm_set_preferred_mode(connector, 1024, 768);

	return ret;
	}

	static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
	.get_modes = tfp410_get_modes,
	};

	static enum drm_connector_status
	tfp410_connector_detect(struct drm_connector *connector, bool force)
	{
	struct tfp410 *dvi = drm_connector_to_tfp410(connector);

	if (dvi->ddc) {
	if (drm_probe_ddc(dvi->ddc))
	return connector_status_connected;
	else
	return connector_status_disconnected;
	}

	return connector_status_unknown;
	}

	static const struct drm_connector_funcs tfp410_con_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.detect = tfp410_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = drm_connector_cleanup,
	.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 int tfp410_attach(struct drm_bridge *bridge)
	{
	struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
	int ret;

	if (!bridge->encoder) {
	dev_err(dvi->dev, "Missing encoder\n");
	return -ENODEV;
	}

	drm_connector_helper_add(&dvi->connector,
	&tfp410_con_helper_funcs);
	ret = drm_connector_init(bridge->dev, &dvi->connector,
	&tfp410_con_funcs, DRM_MODE_CONNECTOR_HDMIA);
	if (ret) {
	dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
	return ret;
	}

	drm_mode_connector_attach_encoder(&dvi->connector,
	bridge->encoder);

	return 0;
	}

	static const struct drm_bridge_funcs tfp410_bridge_funcs = {
	.attach = tfp410_attach,
	};

	static int tfp410_get_connector_ddc(struct tfp410 *dvi)
	{
	struct device_node ep = NULL, connector_node = NULL;
	struct device_node *ddc_phandle = NULL;
	int ret = 0;

	/* port@1 is the connector node */
	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
	if (!ep)
	goto fail;

	connector_node = of_graph_get_remote_port_parent(ep);
	if (!connector_node)
	goto fail;

	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
	if (!ddc_phandle)
	goto fail;

	dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
	if (dvi->ddc)
	dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
	else
	ret = -EPROBE_DEFER;

	fail:
	of_node_put(ep);
	of_node_put(connector_node);
	of_node_put(ddc_phandle);
	return ret;
	}

	static int tfp410_init(struct device *dev)
	{
	struct tfp410 *dvi;
	int ret;

	if (!dev->of_node) {
	dev_err(dev, "device-tree data is missing\n");
	return -ENXIO;
	}

	dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
	if (!dvi)
	return -ENOMEM;
	dev_set_drvdata(dev, dvi);

	dvi->bridge.funcs = &tfp410_bridge_funcs;
	dvi->bridge.of_node = dev->of_node;
	dvi->dev = dev;

	ret = tfp410_get_connector_ddc(dvi);
	if (ret)
	goto fail;

	ret = drm_bridge_add(&dvi->bridge);
	if (ret) {
	dev_err(dev, "drm_bridge_add() failed: %d\n", ret);
	goto fail;
	}

	return 0;
	fail:
	i2c_put_adapter(dvi->ddc);
	return ret;
	}

	static int tfp410_fini(struct device *dev)
	{
	struct tfp410 *dvi = dev_get_drvdata(dev);

	drm_bridge_remove(&dvi->bridge);

	if (dvi->ddc)
	i2c_put_adapter(dvi->ddc);

	return 0;
	}

	static int tfp410_probe(struct platform_device *pdev)
	{
	return tfp410_init(&pdev->dev);
	}

	static int tfp410_remove(struct platform_device *pdev)
	{
	return tfp410_fini(&pdev->dev);
	}

	static const struct of_device_id tfp410_match[] = {
	{ .compatible = "ti,tfp410" },
	{},
	};
	MODULE_DEVICE_TABLE(of, tfp410_match);

	struct platform_driver tfp410_platform_driver = {
	.probe = tfp410_probe,
	.remove = tfp410_remove,
	.driver = {
	.name = "tfp410-bridge",
	.of_match_table = tfp410_match,
	},
	};

	#if IS_ENABLED(CONFIG_I2C)
	/* There is currently no i2c functionality. */
	static int tfp410_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int reg;

	if (!client->dev.of_node \|\|
	of_property_read_u32(client->dev.of_node, "reg", &reg)) {
	dev_err(&client->dev,
	"Can't get i2c reg property from device-tree\n");
	return -ENXIO;
	}

	return tfp410_init(&client->dev);
	}

	static int tfp410_i2c_remove(struct i2c_client *client)
	{
	return tfp410_fini(&client->dev);
	}

	static const struct i2c_device_id tfp410_i2c_ids[] = {
	{ "tfp410", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);

	static struct i2c_driver tfp410_i2c_driver = {
	.driver = {
	.name = "tfp410",
	.of_match_table = of_match_ptr(tfp410_match),
	},
	.id_table = tfp410_i2c_ids,
	.probe = tfp410_i2c_probe,
	.remove = tfp410_i2c_remove,
	};
	#endif /* IS_ENABLED(CONFIG_I2C) */

	static struct {
	uint i2c:1;
	uint platform:1;
	} tfp410_registered_driver;

	static int __init tfp410_module_init(void)
	{
	int ret;

	#if IS_ENABLED(CONFIG_I2C)
	ret = i2c_add_driver(&tfp410_i2c_driver);
	if (ret)
	pr_err("%s: registering i2c driver failed: %d",
	__func__, ret);
	else
	tfp410_registered_driver.i2c = 1;
	#endif

	ret = platform_driver_register(&tfp410_platform_driver);
	if (ret)
	pr_err("%s: registering platform driver failed: %d",
	__func__, ret);
	else
	tfp410_registered_driver.platform = 1;

	if (tfp410_registered_driver.i2c \|\|
	tfp410_registered_driver.platform)
	return 0;

	return ret;
	}
	module_init(tfp410_module_init);

	static void __exit tfp410_module_exit(void)
	{
	#if IS_ENABLED(CONFIG_I2C)
	if (tfp410_registered_driver.i2c)
	i2c_del_driver(&tfp410_i2c_driver);
	#endif
	if (tfp410_registered_driver.platform)
	platform_driver_unregister(&tfp410_platform_driver);
	}
	module_exit(tfp410_module_exit);

	MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
	MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
	MODULE_LICENSE("GPL");