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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Renesas Electronics Corporation
* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <drm/drm_bridge.h>
#include <drm/drm_panel.h>
struct lvds_codec {
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
struct gpio_desc *powerdown_gpio;
u32 connector_type;
};
static inline struct lvds_codec *to_lvds_codec(struct drm_bridge *bridge)
{
return container_of(bridge, struct lvds_codec, bridge);
}
static int lvds_codec_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge,
bridge, flags);
}
static void lvds_codec_enable(struct drm_bridge *bridge)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
if (lvds_codec->powerdown_gpio)
gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
}
static void lvds_codec_disable(struct drm_bridge *bridge)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
if (lvds_codec->powerdown_gpio)
gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
}
static const struct drm_bridge_funcs funcs = {
.attach = lvds_codec_attach,
.enable = lvds_codec_enable,
.disable = lvds_codec_disable,
};
static int lvds_codec_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *panel_node;
struct drm_panel *panel;
struct lvds_codec *lvds_codec;
lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
if (!lvds_codec)
return -ENOMEM;
lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(lvds_codec->powerdown_gpio))
return dev_err_probe(dev, PTR_ERR(lvds_codec->powerdown_gpio),
"powerdown GPIO failure\n");
/* Locate the panel DT node. */
panel_node = of_graph_get_remote_node(dev->of_node, 1, 0);
if (!panel_node) {
dev_dbg(dev, "panel DT node not found\n");
return -ENXIO;
}
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
if (IS_ERR(panel)) {
dev_dbg(dev, "panel not found, deferring probe\n");
return PTR_ERR(panel);
}
lvds_codec->panel_bridge =
devm_drm_panel_bridge_add_typed(dev, panel,
lvds_codec->connector_type);
if (IS_ERR(lvds_codec->panel_bridge))
return PTR_ERR(lvds_codec->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_codec->bridge.of_node = dev->of_node;
lvds_codec->bridge.funcs = &funcs;
drm_bridge_add(&lvds_codec->bridge);
platform_set_drvdata(pdev, lvds_codec);
return 0;
}
static int lvds_codec_remove(struct platform_device *pdev)
{
struct lvds_codec *lvds_codec = platform_get_drvdata(pdev);
drm_bridge_remove(&lvds_codec->bridge);
return 0;
}
static const struct of_device_id lvds_codec_match[] = {
{
.compatible = "lvds-decoder",
.data = (void *)DRM_MODE_CONNECTOR_DPI,
},
{
.compatible = "lvds-encoder",
.data = (void *)DRM_MODE_CONNECTOR_LVDS,
},
{
.compatible = "thine,thc63lvdm83d",
.data = (void *)DRM_MODE_CONNECTOR_LVDS,
},
{},
};
MODULE_DEVICE_TABLE(of, lvds_codec_match);
static struct platform_driver lvds_codec_driver = {
.probe = lvds_codec_probe,
.remove = lvds_codec_remove,
.driver = {
.name = "lvds-codec",
.of_match_table = lvds_codec_match,
},
};
module_platform_driver(lvds_codec_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("LVDS encoders and decoders");
MODULE_LICENSE("GPL");
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