| // 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/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 <video/display_timing.h> |
| #include <video/of_display_timing.h> |
| #include <video/videomode.h> |
| |
| #include <drm/drm_crtc.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 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) { |
| dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n", |
| np, ret); |
| 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; |
| 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; |
| } |
| |
| lvds->backlight = devm_of_find_backlight(lvds->dev); |
| if (IS_ERR(lvds->backlight)) |
| return PTR_ERR(lvds->backlight); |
| |
| /* |
| * 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) |
| return ret; |
| |
| dev_set_drvdata(lvds->dev, lvds); |
| return 0; |
| } |
| |
| static int panel_lvds_remove(struct platform_device *pdev) |
| { |
| struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev); |
| |
| drm_panel_remove(&lvds->panel); |
| |
| panel_lvds_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"); |