Release 4.12 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_atomic_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_encoder.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_panel.h>
#include <linux/of_graph.h>
struct lvds_encoder {
struct device *dev;
struct drm_bridge bridge;
struct drm_connector connector;
struct drm_panel *panel;
};
static inline struct lvds_encoder *
drm_bridge_to_lvds_encoder(struct drm_bridge *bridge)
{
return container_of(bridge, struct lvds_encoder, bridge);
}
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static inline struct lvds_encoder *
drm_connector_to_lvds_encoder(struct drm_connector *connector)
{
return container_of(connector, struct lvds_encoder, connector);
}
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static int lvds_connector_get_modes(struct drm_connector *connector)
{
struct lvds_encoder *lvds = drm_connector_to_lvds_encoder(connector);
return drm_panel_get_modes(lvds->panel);
}
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static const struct drm_connector_helper_funcs lvds_connector_helper_funcs = {
.get_modes = lvds_connector_get_modes,
};
static const struct drm_connector_funcs lvds_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int lvds_encoder_attach(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds = drm_bridge_to_lvds_encoder(bridge);
struct drm_connector *connector = &lvds->connector;
int ret;
if (!bridge->encoder) {
DRM_ERROR("Missing encoder\n");
return -ENODEV;
}
drm_connector_helper_add(connector, &lvds_connector_helper_funcs);
ret = drm_connector_init(bridge->dev, connector, &lvds_connector_funcs,
DRM_MODE_CONNECTOR_LVDS);
if (ret) {
DRM_ERROR("Failed to initialize connector\n");
return ret;
}
drm_mode_connector_attach_encoder(&lvds->connector, bridge->encoder);
ret = drm_panel_attach(lvds->panel, &lvds->connector);
if (ret < 0)
return ret;
return 0;
}
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static void lvds_encoder_detach(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds = drm_bridge_to_lvds_encoder(bridge);
drm_panel_detach(lvds->panel);
}
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static void lvds_encoder_pre_enable(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds = drm_bridge_to_lvds_encoder(bridge);
drm_panel_prepare(lvds->panel);
}
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static void lvds_encoder_enable(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds = drm_bridge_to_lvds_encoder(bridge);
drm_panel_enable(lvds->panel);
}
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static void lvds_encoder_disable(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds = drm_bridge_to_lvds_encoder(bridge);
drm_panel_disable(lvds->panel);
}
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static void lvds_encoder_post_disable(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds = drm_bridge_to_lvds_encoder(bridge);
drm_panel_unprepare(lvds->panel);
}
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static const struct drm_bridge_funcs lvds_encoder_bridge_funcs = {
.attach = lvds_encoder_attach,
.detach = lvds_encoder_detach,
.pre_enable = lvds_encoder_pre_enable,
.enable = lvds_encoder_enable,
.disable = lvds_encoder_disable,
.post_disable = lvds_encoder_post_disable,
};
static int lvds_encoder_probe(struct platform_device *pdev)
{
struct lvds_encoder *lvds;
struct device_node *port;
struct device_node *endpoint;
struct device_node *panel;
lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
if (!lvds)
return -ENOMEM;
lvds->dev = &pdev->dev;
platform_set_drvdata(pdev, lvds);
lvds->bridge.funcs = &lvds_encoder_bridge_funcs;
lvds->bridge.of_node = pdev->dev.of_node;
/* 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 = of_graph_get_remote_port_parent(endpoint);
of_node_put(endpoint);
if (!panel) {
dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
return -ENXIO;
}
lvds->panel = of_drm_find_panel(panel);
of_node_put(panel);
if (!lvds->panel) {
dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
return -EPROBE_DEFER;
}
/* Register the bridge. */
return drm_bridge_add(&lvds->bridge);
}
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static int lvds_encoder_remove(struct platform_device *pdev)
{
struct lvds_encoder *encoder = platform_get_drvdata(pdev);
drm_bridge_remove(&encoder->bridge);
return 0;
}
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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");
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