diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/lvds-encoder.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/lvds-encoder.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c new file mode 100644 index 000000000..f56c92f7a --- /dev/null +++ b/drivers/gpu/drm/bridge/lvds-encoder.c @@ -0,0 +1,123 @@ +/* + * 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 (IS_ERR(panel)) { + dev_dbg(&pdev->dev, "panel not found, deferring probe\n"); + return PTR_ERR(panel); + } + + 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"); |