diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/bridge/lvds-codec.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/lvds-codec.c b/drivers/gpu/drm/bridge/lvds-codec.c new file mode 100644 index 000000000000..5f04cc11227e --- /dev/null +++ b/drivers/gpu/drm/bridge/lvds-codec.c @@ -0,0 +1,151 @@ +// 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 int lvds_codec_attach(struct drm_bridge *bridge) +{ + struct lvds_codec *lvds_codec = container_of(bridge, + struct lvds_codec, bridge); + + return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge, + bridge); +} + +static void lvds_codec_enable(struct drm_bridge *bridge) +{ + struct lvds_codec *lvds_codec = container_of(bridge, + struct 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 = container_of(bridge, + struct lvds_codec, bridge); + + if (lvds_codec->powerdown_gpio) + gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1); +} + +static 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)) { + int err = PTR_ERR(lvds_codec->powerdown_gpio); + + if (err != -EPROBE_DEFER) + dev_err(dev, "powerdown GPIO failure: %d\n", err); + return err; + } + + /* 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"); |