// SPDX-License-Identifier: GPL-2.0+ /* * Generic LVDS panel driver * * Copyright (C) 2016 Laurent Pinchart * Copyright (C) 2016 Renesas Electronics Corporation * * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) */ #include <linux/gpio/consumer.h> #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <video/display_timing.h> #include <video/of_display_timing.h> #include <video/videomode.h> #include <drm/drm_crtc.h> #include <drm/drm_of.h> #include <drm/drm_panel.h> struct panel_lvds { struct drm_panel panel; struct device *dev; const char *label; unsigned int width; unsigned int height; struct drm_display_mode dmode; u32 bus_flags; unsigned int bus_format; struct regulator *supply; struct gpio_desc *enable_gpio; struct gpio_desc *reset_gpio; enum drm_panel_orientation orientation; }; static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel) { return container_of(panel, struct panel_lvds, panel); } static int panel_lvds_unprepare(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); if (lvds->enable_gpio) gpiod_set_value_cansleep(lvds->enable_gpio, 0); if (lvds->supply) regulator_disable(lvds->supply); return 0; } static int panel_lvds_prepare(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); if (lvds->supply) { int err; err = regulator_enable(lvds->supply); if (err < 0) { dev_err(lvds->dev, "failed to enable supply: %d\n", err); return err; } } if (lvds->enable_gpio) gpiod_set_value_cansleep(lvds->enable_gpio, 1); return 0; } static int panel_lvds_get_modes(struct drm_panel *panel, struct drm_connector *connector) { struct panel_lvds *lvds = to_panel_lvds(panel); struct drm_display_mode *mode; mode = drm_mode_duplicate(connector->dev, &lvds->dmode); if (!mode) return 0; mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; drm_mode_probed_add(connector, mode); connector->display_info.width_mm = lvds->dmode.width_mm; connector->display_info.height_mm = lvds->dmode.height_mm; drm_display_info_set_bus_formats(&connector->display_info, &lvds->bus_format, 1); connector->display_info.bus_flags = lvds->bus_flags; /* * TODO: Remove once all drm drivers call * drm_connector_set_orientation_from_panel() */ drm_connector_set_panel_orientation(connector, lvds->orientation); return 1; } static enum drm_panel_orientation panel_lvds_get_orientation(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); return lvds->orientation; } static const struct drm_panel_funcs panel_lvds_funcs = { .unprepare = panel_lvds_unprepare, .prepare = panel_lvds_prepare, .get_modes = panel_lvds_get_modes, .get_orientation = panel_lvds_get_orientation, }; static int panel_lvds_parse_dt(struct panel_lvds *lvds) { struct device_node *np = lvds->dev->of_node; int ret; ret = of_drm_get_panel_orientation(np, &lvds->orientation); if (ret < 0) { dev_err(lvds->dev, "%pOF: failed to get orientation %d\n", np, ret); return ret; } ret = of_get_drm_panel_display_mode(np, &lvds->dmode, &lvds->bus_flags); if (ret < 0) { dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n", np, ret); return ret; } of_property_read_string(np, "label", &lvds->label); ret = drm_of_lvds_get_data_mapping(np); if (ret < 0) { dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", np, "data-mapping"); return ret; } lvds->bus_format = ret; lvds->bus_flags |= of_property_read_bool(np, "data-mirror") ? DRM_BUS_FLAG_DATA_LSB_TO_MSB : DRM_BUS_FLAG_DATA_MSB_TO_LSB; return 0; } static int panel_lvds_probe(struct platform_device *pdev) { struct panel_lvds *lvds; int ret; lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL); if (!lvds) return -ENOMEM; lvds->dev = &pdev->dev; ret = panel_lvds_parse_dt(lvds); if (ret < 0) return ret; lvds->supply = devm_regulator_get_optional(lvds->dev, "power"); if (IS_ERR(lvds->supply)) { ret = PTR_ERR(lvds->supply); if (ret != -ENODEV) { if (ret != -EPROBE_DEFER) dev_err(lvds->dev, "failed to request regulator: %d\n", ret); return ret; } lvds->supply = NULL; } /* Get GPIOs and backlight controller. */ lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable", GPIOD_OUT_LOW); if (IS_ERR(lvds->enable_gpio)) { ret = PTR_ERR(lvds->enable_gpio); dev_err(lvds->dev, "failed to request %s GPIO: %d\n", "enable", ret); return ret; } lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(lvds->reset_gpio)) { ret = PTR_ERR(lvds->reset_gpio); dev_err(lvds->dev, "failed to request %s GPIO: %d\n", "reset", ret); return ret; } /* * TODO: Handle all power supplies specified in the DT node in a generic * way for panels that don't care about power supply ordering. LVDS * panels that require a specific power sequence will need a dedicated * driver. */ /* Register the panel. */ drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs, DRM_MODE_CONNECTOR_LVDS); ret = drm_panel_of_backlight(&lvds->panel); if (ret) return ret; drm_panel_add(&lvds->panel); dev_set_drvdata(lvds->dev, lvds); return 0; } static int panel_lvds_remove(struct platform_device *pdev) { struct panel_lvds *lvds = platform_get_drvdata(pdev); drm_panel_remove(&lvds->panel); drm_panel_disable(&lvds->panel); return 0; } static const struct of_device_id panel_lvds_of_table[] = { { .compatible = "panel-lvds", }, { /* Sentinel */ }, }; MODULE_DEVICE_TABLE(of, panel_lvds_of_table); static struct platform_driver panel_lvds_driver = { .probe = panel_lvds_probe, .remove = panel_lvds_remove, .driver = { .name = "panel-lvds", .of_match_table = panel_lvds_of_table, }, }; module_platform_driver(panel_lvds_driver); MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); MODULE_DESCRIPTION("LVDS Panel Driver"); MODULE_LICENSE("GPL");