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1// SPDX-License-Identifier: GPL-2.02/*3 * Sharp LS037V7DW01 LCD Panel Driver4 *5 * Copyright (C) 2019 Texas Instruments Incorporated6 *7 * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver8 *9 * Copyright (C) 2013 Texas Instruments Incorporated10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>11 */12 13#include <linux/delay.h>14#include <linux/gpio/consumer.h>15#include <linux/module.h>16#include <linux/of.h>17#include <linux/platform_device.h>18#include <linux/regulator/consumer.h>19 20#include <drm/drm_connector.h>21#include <drm/drm_modes.h>22#include <drm/drm_panel.h>23 24struct ls037v7dw01_panel {25 struct drm_panel panel;26 struct platform_device *pdev;27 28 struct regulator *vdd;29 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */30 struct gpio_desc *ini_gpio; /* high = power on */31 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */32 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */33 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */34};35 36#define to_ls037v7dw01_device(p) \37 container_of(p, struct ls037v7dw01_panel, panel)38 39static int ls037v7dw01_disable(struct drm_panel *panel)40{41 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);42 43 gpiod_set_value_cansleep(lcd->ini_gpio, 0);44 gpiod_set_value_cansleep(lcd->resb_gpio, 0);45 46 /* Wait at least 5 vsyncs after disabling the LCD. */47 msleep(100);48 49 return 0;50}51 52static int ls037v7dw01_unprepare(struct drm_panel *panel)53{54 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);55 56 regulator_disable(lcd->vdd);57 return 0;58}59 60static int ls037v7dw01_prepare(struct drm_panel *panel)61{62 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);63 int ret;64 65 ret = regulator_enable(lcd->vdd);66 if (ret < 0)67 dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",68 __func__);69 70 return ret;71}72 73static int ls037v7dw01_enable(struct drm_panel *panel)74{75 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);76 77 /* Wait couple of vsyncs before enabling the LCD. */78 msleep(50);79 80 gpiod_set_value_cansleep(lcd->resb_gpio, 1);81 gpiod_set_value_cansleep(lcd->ini_gpio, 1);82 83 return 0;84}85 86static const struct drm_display_mode ls037v7dw01_mode = {87 .clock = 19200,88 .hdisplay = 480,89 .hsync_start = 480 + 1,90 .hsync_end = 480 + 1 + 2,91 .htotal = 480 + 1 + 2 + 28,92 .vdisplay = 640,93 .vsync_start = 640 + 1,94 .vsync_end = 640 + 1 + 1,95 .vtotal = 640 + 1 + 1 + 1,96 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,97 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,98 .width_mm = 56,99 .height_mm = 75,100};101 102static int ls037v7dw01_get_modes(struct drm_panel *panel,103 struct drm_connector *connector)104{105 struct drm_display_mode *mode;106 107 mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);108 if (!mode)109 return -ENOMEM;110 111 drm_mode_set_name(mode);112 drm_mode_probed_add(connector, mode);113 114 connector->display_info.width_mm = ls037v7dw01_mode.width_mm;115 connector->display_info.height_mm = ls037v7dw01_mode.height_mm;116 /*117 * FIXME: According to the datasheet pixel data is sampled on the118 * rising edge of the clock, but the code running on the SDP3430119 * indicates sampling on the negative edge. This should be tested on a120 * real device.121 */122 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH123 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE124 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;125 126 return 1;127}128 129static const struct drm_panel_funcs ls037v7dw01_funcs = {130 .disable = ls037v7dw01_disable,131 .unprepare = ls037v7dw01_unprepare,132 .prepare = ls037v7dw01_prepare,133 .enable = ls037v7dw01_enable,134 .get_modes = ls037v7dw01_get_modes,135};136 137static int ls037v7dw01_probe(struct platform_device *pdev)138{139 struct ls037v7dw01_panel *lcd;140 141 lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);142 if (!lcd)143 return -ENOMEM;144 145 platform_set_drvdata(pdev, lcd);146 lcd->pdev = pdev;147 148 lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");149 if (IS_ERR(lcd->vdd))150 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->vdd),151 "failed to get regulator\n");152 153 lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);154 if (IS_ERR(lcd->ini_gpio))155 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->ini_gpio),156 "failed to get enable gpio\n");157 158 lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);159 if (IS_ERR(lcd->resb_gpio))160 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->resb_gpio),161 "failed to get reset gpio\n");162 163 lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,164 GPIOD_OUT_LOW);165 if (IS_ERR(lcd->mo_gpio)) {166 dev_err(&pdev->dev, "failed to get mode[0] gpio\n");167 return PTR_ERR(lcd->mo_gpio);168 }169 170 lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,171 GPIOD_OUT_LOW);172 if (IS_ERR(lcd->lr_gpio)) {173 dev_err(&pdev->dev, "failed to get mode[1] gpio\n");174 return PTR_ERR(lcd->lr_gpio);175 }176 177 lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,178 GPIOD_OUT_LOW);179 if (IS_ERR(lcd->ud_gpio)) {180 dev_err(&pdev->dev, "failed to get mode[2] gpio\n");181 return PTR_ERR(lcd->ud_gpio);182 }183 184 drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,185 DRM_MODE_CONNECTOR_DPI);186 187 drm_panel_add(&lcd->panel);188 189 return 0;190}191 192static void ls037v7dw01_remove(struct platform_device *pdev)193{194 struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);195 196 drm_panel_remove(&lcd->panel);197 drm_panel_disable(&lcd->panel);198 drm_panel_unprepare(&lcd->panel);199}200 201static const struct of_device_id ls037v7dw01_of_match[] = {202 { .compatible = "sharp,ls037v7dw01", },203 { /* sentinel */ },204};205 206MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);207 208static struct platform_driver ls037v7dw01_driver = {209 .probe = ls037v7dw01_probe,210 .remove_new = ls037v7dw01_remove,211 .driver = {212 .name = "panel-sharp-ls037v7dw01",213 .of_match_table = ls037v7dw01_of_match,214 },215};216 217module_platform_driver(ls037v7dw01_driver);218 219MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");220MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");221MODULE_LICENSE("GPL");222