/* * Generic LVDS panel driver * * Copyright (C) 2016 Laurent Pinchart * Copyright (C) 2016 Renesas Electronics Corporation * * Contact: 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 <linux/backlight.h> #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 <drm/drmP.h> #include <drm/drm_crtc.h> #include <drm/drm_panel.h> #include <video/display_timing.h> #include <video/of_display_timing.h> #include <video/videomode.h> struct panel_lvds { struct drm_panel panel; struct device *dev; const char *label; unsigned int width; unsigned int height; struct videomode video_mode; unsigned int bus_format; bool data_mirror; struct backlight_device *backlight; struct regulator *supply; struct gpio_desc *enable_gpio; struct gpio_desc *reset_gpio; }; static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel) { return container_of(panel, struct panel_lvds, panel); } static int panel_lvds_disable(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); if (lvds->backlight) { lvds->backlight->props.power = FB_BLANK_POWERDOWN; lvds->backlight->props.state |= BL_CORE_FBBLANK; backlight_update_status(lvds->backlight); } return 0; } 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_enable(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); if (lvds->backlight) { lvds->backlight->props.state &= ~BL_CORE_FBBLANK; lvds->backlight->props.power = FB_BLANK_UNBLANK; backlight_update_status(lvds->backlight); } return 0; } static int panel_lvds_get_modes(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); struct drm_connector *connector = lvds->panel.connector; struct drm_display_mode *mode; mode = drm_mode_create(lvds->panel.drm); if (!mode) return 0; drm_display_mode_from_videomode(&lvds->video_mode, mode); mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; drm_mode_probed_add(connector, mode); connector->display_info.width_mm = lvds->width; connector->display_info.height_mm = lvds->height; drm_display_info_set_bus_formats(&connector->display_info, &lvds->bus_format, 1); connector->display_info.bus_flags = lvds->data_mirror ? DRM_BUS_FLAG_DATA_LSB_TO_MSB : DRM_BUS_FLAG_DATA_MSB_TO_LSB; return 1; } static const struct drm_panel_funcs panel_lvds_funcs = { .disable = panel_lvds_disable, .unprepare = panel_lvds_unprepare, .prepare = panel_lvds_prepare, .enable = panel_lvds_enable, .get_modes = panel_lvds_get_modes, }; static int panel_lvds_parse_dt(struct panel_lvds *lvds) { struct device_node *np = lvds->dev->of_node; struct display_timing timing; const char *mapping; int ret; ret = of_get_display_timing(np, "panel-timing", &timing); if (ret < 0) return ret; videomode_from_timing(&timing, &lvds->video_mode); ret = of_property_read_u32(np, "width-mm", &lvds->width); if (ret < 0) { dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", np, "width-mm"); return -ENODEV; } ret = of_property_read_u32(np, "height-mm", &lvds->height); if (ret < 0) { dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", np, "height-mm"); return -ENODEV; } of_property_read_string(np, "label", &lvds->label); ret = of_property_read_string(np, "data-mapping", &mapping); if (ret < 0) { dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", np, "data-mapping"); return -ENODEV; } if (!strcmp(mapping, "jeida-18")) { lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG; } else if (!strcmp(mapping, "jeida-24")) { lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA; } else if (!strcmp(mapping, "vesa-24")) { lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG; } else { dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", np, "data-mapping"); return -EINVAL; } lvds->data_mirror = of_property_read_bool(np, "data-mirror"); return 0; } static int panel_lvds_probe(struct platform_device *pdev) { struct panel_lvds *lvds; struct device_node *np; 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; } np = of_parse_phandle(lvds->dev->of_node, "backlight", 0); if (np) { lvds->backlight = of_find_backlight_by_node(np); of_node_put(np); if (!lvds->backlight) return -EPROBE_DEFER; } /* * 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->panel.dev = lvds->dev; lvds->panel.funcs = &panel_lvds_funcs; ret = drm_panel_add(&lvds->panel); if (ret < 0) goto error; dev_set_drvdata(lvds->dev, lvds); return 0; error: put_device(&lvds->backlight->dev); return ret; } static int panel_lvds_remove(struct platform_device *pdev) { struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev); drm_panel_detach(&lvds->panel); drm_panel_remove(&lvds->panel); panel_lvds_disable(&lvds->panel); if (lvds->backlight) put_device(&lvds->backlight->dev); 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");