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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 <linux/regulator/consumer.h>
- #include <drm/drm_bridge.h>
- #include <drm/drm_panel.h>
- struct lvds_codec {
- struct device *dev;
- struct drm_bridge bridge;
- struct drm_bridge *panel_bridge;
- struct regulator *vcc;
- 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);
- int ret;
- ret = regulator_enable(lvds_codec->vcc);
- if (ret) {
- dev_err(lvds_codec->dev,
- "Failed to enable regulator \"vcc\": %d\n", ret);
- return;
- }
- 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);
- int ret;
- if (lvds_codec->powerdown_gpio)
- gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
- ret = regulator_disable(lvds_codec->vcc);
- if (ret)
- dev_err(lvds_codec->dev,
- "Failed to disable regulator \"vcc\": %d\n", ret);
- }
- 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;
- int ret;
- lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
- if (!lvds_codec)
- return -ENOMEM;
- lvds_codec->dev = &pdev->dev;
- lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
- lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "power");
- if (IS_ERR(lvds_codec->vcc)) {
- ret = PTR_ERR(lvds_codec->vcc);
- if (ret != -EPROBE_DEFER)
- dev_err(lvds_codec->dev,
- "Unable to get \"vcc\" supply: %d\n", ret);
- return ret;
- }
- 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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