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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Generic LVDS panel driver4 *5 * Copyright (C) 2016 Laurent Pinchart6 * Copyright (C) 2016 Renesas Electronics Corporation7 *8 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)9 */10 11#include <linux/gpio/consumer.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/platform_device.h>15#include <linux/regulator/consumer.h>16#include <linux/slab.h>17 18#include <video/display_timing.h>19#include <video/of_display_timing.h>20#include <video/videomode.h>21 22#include <drm/drm_crtc.h>23#include <drm/drm_of.h>24#include <drm/drm_panel.h>25 26struct panel_lvds {27 struct drm_panel panel;28 struct device *dev;29 30 const char *label;31 unsigned int width;32 unsigned int height;33 struct drm_display_mode dmode;34 u32 bus_flags;35 unsigned int bus_format;36 37 struct regulator *supply;38 39 struct gpio_desc *enable_gpio;40 struct gpio_desc *reset_gpio;41 42 enum drm_panel_orientation orientation;43};44 45static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)46{47 return container_of(panel, struct panel_lvds, panel);48}49 50static int panel_lvds_unprepare(struct drm_panel *panel)51{52 struct panel_lvds *lvds = to_panel_lvds(panel);53 54 if (lvds->enable_gpio)55 gpiod_set_value_cansleep(lvds->enable_gpio, 0);56 57 if (lvds->supply)58 regulator_disable(lvds->supply);59 60 return 0;61}62 63static int panel_lvds_prepare(struct drm_panel *panel)64{65 struct panel_lvds *lvds = to_panel_lvds(panel);66 67 if (lvds->supply) {68 int err;69 70 err = regulator_enable(lvds->supply);71 if (err < 0) {72 dev_err(lvds->dev, "failed to enable supply: %d\n",73 err);74 return err;75 }76 }77 78 if (lvds->enable_gpio)79 gpiod_set_value_cansleep(lvds->enable_gpio, 1);80 81 return 0;82}83 84static int panel_lvds_get_modes(struct drm_panel *panel,85 struct drm_connector *connector)86{87 struct panel_lvds *lvds = to_panel_lvds(panel);88 struct drm_display_mode *mode;89 90 mode = drm_mode_duplicate(connector->dev, &lvds->dmode);91 if (!mode)92 return 0;93 94 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;95 drm_mode_probed_add(connector, mode);96 97 connector->display_info.width_mm = lvds->dmode.width_mm;98 connector->display_info.height_mm = lvds->dmode.height_mm;99 drm_display_info_set_bus_formats(&connector->display_info,100 &lvds->bus_format, 1);101 connector->display_info.bus_flags = lvds->bus_flags;102 103 /*104 * TODO: Remove once all drm drivers call105 * drm_connector_set_orientation_from_panel()106 */107 drm_connector_set_panel_orientation(connector, lvds->orientation);108 109 return 1;110}111 112static enum drm_panel_orientation panel_lvds_get_orientation(struct drm_panel *panel)113{114 struct panel_lvds *lvds = to_panel_lvds(panel);115 116 return lvds->orientation;117}118 119static const struct drm_panel_funcs panel_lvds_funcs = {120 .unprepare = panel_lvds_unprepare,121 .prepare = panel_lvds_prepare,122 .get_modes = panel_lvds_get_modes,123 .get_orientation = panel_lvds_get_orientation,124};125 126static int panel_lvds_parse_dt(struct panel_lvds *lvds)127{128 struct device_node *np = lvds->dev->of_node;129 int ret;130 131 ret = of_drm_get_panel_orientation(np, &lvds->orientation);132 if (ret < 0) {133 dev_err(lvds->dev, "%pOF: failed to get orientation %d\n", np, ret);134 return ret;135 }136 137 ret = of_get_drm_panel_display_mode(np, &lvds->dmode, &lvds->bus_flags);138 if (ret < 0) {139 dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",140 np, ret);141 return ret;142 }143 144 of_property_read_string(np, "label", &lvds->label);145 146 ret = drm_of_lvds_get_data_mapping(np);147 if (ret < 0) {148 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",149 np, "data-mapping");150 return ret;151 }152 153 lvds->bus_format = ret;154 155 lvds->bus_flags |= of_property_read_bool(np, "data-mirror") ?156 DRM_BUS_FLAG_DATA_LSB_TO_MSB :157 DRM_BUS_FLAG_DATA_MSB_TO_LSB;158 159 return 0;160}161 162static int panel_lvds_probe(struct platform_device *pdev)163{164 struct panel_lvds *lvds;165 int ret;166 167 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);168 if (!lvds)169 return -ENOMEM;170 171 lvds->dev = &pdev->dev;172 173 ret = panel_lvds_parse_dt(lvds);174 if (ret < 0)175 return ret;176 177 lvds->supply = devm_regulator_get_optional(lvds->dev, "power");178 if (IS_ERR(lvds->supply)) {179 ret = PTR_ERR(lvds->supply);180 181 if (ret != -ENODEV) {182 if (ret != -EPROBE_DEFER)183 dev_err(lvds->dev, "failed to request regulator: %d\n",184 ret);185 return ret;186 }187 188 lvds->supply = NULL;189 }190 191 /* Get GPIOs and backlight controller. */192 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",193 GPIOD_OUT_LOW);194 if (IS_ERR(lvds->enable_gpio)) {195 ret = PTR_ERR(lvds->enable_gpio);196 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",197 "enable", ret);198 return ret;199 }200 201 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",202 GPIOD_OUT_HIGH);203 if (IS_ERR(lvds->reset_gpio)) {204 ret = PTR_ERR(lvds->reset_gpio);205 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",206 "reset", ret);207 return ret;208 }209 210 /*211 * TODO: Handle all power supplies specified in the DT node in a generic212 * way for panels that don't care about power supply ordering. LVDS213 * panels that require a specific power sequence will need a dedicated214 * driver.215 */216 217 /* Register the panel. */218 drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,219 DRM_MODE_CONNECTOR_LVDS);220 221 ret = drm_panel_of_backlight(&lvds->panel);222 if (ret)223 return ret;224 225 drm_panel_add(&lvds->panel);226 227 dev_set_drvdata(lvds->dev, lvds);228 return 0;229}230 231static void panel_lvds_remove(struct platform_device *pdev)232{233 struct panel_lvds *lvds = platform_get_drvdata(pdev);234 235 drm_panel_remove(&lvds->panel);236 237 drm_panel_disable(&lvds->panel);238}239 240static const struct of_device_id panel_lvds_of_table[] = {241 { .compatible = "panel-lvds", },242 { /* Sentinel */ },243};244 245MODULE_DEVICE_TABLE(of, panel_lvds_of_table);246 247static struct platform_driver panel_lvds_driver = {248 .probe = panel_lvds_probe,249 .remove_new = panel_lvds_remove,250 .driver = {251 .name = "panel-lvds",252 .of_match_table = panel_lvds_of_table,253 },254};255 256module_platform_driver(panel_lvds_driver);257 258MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");259MODULE_DESCRIPTION("LVDS Panel Driver");260MODULE_LICENSE("GPL");261