diff options
Diffstat (limited to 'drivers/gpu/drm/panel/panel-lvds.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-lvds.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c new file mode 100644 index 0000000000..1b8e315691 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-lvds.c @@ -0,0 +1,260 @@ +// 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.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 void 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); +} + +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_new = 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"); |