[linux-2.6-block.git] / drivers / gpu / drm / bridge / lvds-encoder.c

/*
 * Copyright (C) 2016 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_bridge.h>
#include <drm/drm_panel.h>

#include <linux/of_graph.h>

struct lvds_encoder {
	struct drm_bridge bridge;
	struct drm_bridge *panel_bridge;
};

static int lvds_encoder_attach(struct drm_bridge *bridge)
{
	struct lvds_encoder *lvds_encoder = container_of(bridge,
							 struct lvds_encoder,
							 bridge);

	return drm_bridge_attach(bridge->encoder, lvds_encoder->panel_bridge,
				 bridge);
}

static struct drm_bridge_funcs funcs = {
	.attach = lvds_encoder_attach,
};

static int lvds_encoder_probe(struct platform_device *pdev)
{
	struct device_node *port;
	struct device_node *endpoint;
	struct device_node *panel_node;
	struct drm_panel *panel;
	struct lvds_encoder *lvds_encoder;

	lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
				    GFP_KERNEL);
	if (!lvds_encoder)
		return -ENOMEM;

	/* Locate the panel DT node. */
	port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
	if (!port) {
		dev_dbg(&pdev->dev, "port 1 not found\n");
		return -ENXIO;
	}

	endpoint = of_get_child_by_name(port, "endpoint");
	of_node_put(port);
	if (!endpoint) {
		dev_dbg(&pdev->dev, "no endpoint for port 1\n");
		return -ENXIO;
	}

	panel_node = of_graph_get_remote_port_parent(endpoint);
	of_node_put(endpoint);
	if (!panel_node) {
		dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
		return -ENXIO;
	}

	panel = of_drm_find_panel(panel_node);
	of_node_put(panel_node);
	if (!panel) {
		dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
		return -EPROBE_DEFER;
	}

	lvds_encoder->panel_bridge =
		devm_drm_panel_bridge_add(&pdev->dev,
					  panel, DRM_MODE_CONNECTOR_LVDS);
	if (IS_ERR(lvds_encoder->panel_bridge))
		return PTR_ERR(lvds_encoder->panel_bridge);

	/* The panel_bridge bridge is attached to the panel's of_node,
	 * but we need a bridge attached to our of_node for our user
	 * to look up.
	 */
	lvds_encoder->bridge.of_node = pdev->dev.of_node;
	lvds_encoder->bridge.funcs = &funcs;
	drm_bridge_add(&lvds_encoder->bridge);

	platform_set_drvdata(pdev, lvds_encoder);

	return 0;
}

static int lvds_encoder_remove(struct platform_device *pdev)
{
	struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);

	drm_bridge_remove(&lvds_encoder->bridge);

	return 0;
}

static const struct of_device_id lvds_encoder_match[] = {
	{ .compatible = "lvds-encoder" },
	{ .compatible = "thine,thc63lvdm83d" },
	{},
};
MODULE_DEVICE_TABLE(of, lvds_encoder_match);

static struct platform_driver lvds_encoder_driver = {
	.probe	= lvds_encoder_probe,
	.remove	= lvds_encoder_remove,
	.driver		= {
		.name		= "lvds-encoder",
		.of_match_table	= lvds_encoder_match,
	},
};
module_platform_driver(lvds_encoder_driver);

MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Transparent parallel to LVDS encoder");
MODULE_LICENSE("GPL");
Commit	Line	Data
67cc3e22 LP	1	/*
	2	* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation; either version 2 of
	7	* the License, or (at your option) any later version.
	8	*/
	9
	10	#include <drm/drmP.h>
13dfc054	11	#include <drm/drm_bridge.h>
67cc3e22 LP	12	#include <drm/drm_panel.h>
	13
	14	#include <linux/of_graph.h>
	15
dbb58bfd EA	16	struct lvds_encoder {
	17	struct drm_bridge bridge;
	18	struct drm_bridge *panel_bridge;
	19	};
	20
	21	static int lvds_encoder_attach(struct drm_bridge *bridge)
	22	{
	23	struct lvds_encoder *lvds_encoder = container_of(bridge,
	24	struct lvds_encoder,
	25	bridge);
	26
	27	return drm_bridge_attach(bridge->encoder, lvds_encoder->panel_bridge,
	28	bridge);
	29	}
	30
	31	static struct drm_bridge_funcs funcs = {
	32	.attach = lvds_encoder_attach,
	33	};
	34
67cc3e22 LP	35	static int lvds_encoder_probe(struct platform_device *pdev)
67cc3e22 LP	36	{
67cc3e22 LP	37	struct device_node *port;
67cc3e22 LP	38	struct device_node *endpoint;
13dfc054 EA	39	struct device_node *panel_node;
13dfc054 EA	40	struct drm_panel *panel;
dbb58bfd EA	41	struct lvds_encoder *lvds_encoder;
	42
	43	lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
	44	GFP_KERNEL);
	45	if (!lvds_encoder)
	46	return -ENOMEM;
67cc3e22 LP	47
	48	/* Locate the panel DT node. */
	49	port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
	50	if (!port) {
	51	dev_dbg(&pdev->dev, "port 1 not found\n");
	52	return -ENXIO;
	53	}
	54
	55	endpoint = of_get_child_by_name(port, "endpoint");
	56	of_node_put(port);
	57	if (!endpoint) {
	58	dev_dbg(&pdev->dev, "no endpoint for port 1\n");
	59	return -ENXIO;
	60	}
	61
13dfc054	62	panel_node = of_graph_get_remote_port_parent(endpoint);
67cc3e22	63	of_node_put(endpoint);
13dfc054	64	if (!panel_node) {
67cc3e22 LP	65	dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
	66	return -ENXIO;
	67	}
	68
13dfc054 EA	69	panel = of_drm_find_panel(panel_node);
	70	of_node_put(panel_node);
	71	if (!panel) {
67cc3e22 LP	72	dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
	73	return -EPROBE_DEFER;
	74	}
	75
dbb58bfd EA	76	lvds_encoder->panel_bridge =
	77	devm_drm_panel_bridge_add(&pdev->dev,
	78	panel, DRM_MODE_CONNECTOR_LVDS);
	79	if (IS_ERR(lvds_encoder->panel_bridge))
	80	return PTR_ERR(lvds_encoder->panel_bridge);
	81
	82	/* The panel_bridge bridge is attached to the panel's of_node,
	83	* but we need a bridge attached to our of_node for our user
	84	* to look up.
	85	*/
	86	lvds_encoder->bridge.of_node = pdev->dev.of_node;
	87	lvds_encoder->bridge.funcs = &funcs;
	88	drm_bridge_add(&lvds_encoder->bridge);
13dfc054	89
dbb58bfd	90	platform_set_drvdata(pdev, lvds_encoder);
13dfc054 EA	91
13dfc054 EA	92	return 0;
67cc3e22 LP	93	}
	94
	95	static int lvds_encoder_remove(struct platform_device *pdev)
	96	{
dbb58bfd	97	struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);
67cc3e22	98
dbb58bfd	99	drm_bridge_remove(&lvds_encoder->bridge);
67cc3e22 LP	100
	101	return 0;
	102	}
	103
	104	static const struct of_device_id lvds_encoder_match[] = {
	105	{ .compatible = "lvds-encoder" },
7160d57b	106	{ .compatible = "thine,thc63lvdm83d" },
67cc3e22 LP	107	{},
	108	};
	109	MODULE_DEVICE_TABLE(of, lvds_encoder_match);
	110
	111	static struct platform_driver lvds_encoder_driver = {
	112	.probe = lvds_encoder_probe,
	113	.remove = lvds_encoder_remove,
	114	.driver = {
	115	.name = "lvds-encoder",
	116	.of_match_table = lvds_encoder_match,
	117	},
	118	};
	119	module_platform_driver(lvds_encoder_driver);
	120
	121	MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
	122	MODULE_DESCRIPTION("Transparent parallel to LVDS encoder");
	123	MODULE_LICENSE("GPL");