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1// SPDX-License-Identifier: GPL-2.0+2/*3 * NEC NL8048HL11 Panel Driver4 *5 * Copyright (C) 2019 Texas Instruments Incorporated6 *7 * Based on the omapdrm-specific panel-nec-nl8048hl11 driver8 *9 * Copyright (C) 2010 Texas Instruments Incorporated10 * Author: Erik Gilling <konkers@android.com>11 */12 13#include <linux/delay.h>14#include <linux/gpio/consumer.h>15#include <linux/module.h>16#include <linux/pm.h>17#include <linux/spi/spi.h>18 19#include <drm/drm_connector.h>20#include <drm/drm_modes.h>21#include <drm/drm_panel.h>22 23struct nl8048_panel {24 struct drm_panel panel;25 26 struct spi_device *spi;27 struct gpio_desc *reset_gpio;28};29 30#define to_nl8048_device(p) container_of(p, struct nl8048_panel, panel)31 32static int nl8048_write(struct nl8048_panel *lcd, unsigned char addr,33 unsigned char value)34{35 u8 data[4] = { value, 0x01, addr, 0x00 };36 int ret;37 38 ret = spi_write(lcd->spi, data, sizeof(data));39 if (ret)40 dev_err(&lcd->spi->dev, "SPI write to %u failed: %d\n",41 addr, ret);42 43 return ret;44}45 46static int nl8048_init(struct nl8048_panel *lcd)47{48 static const struct {49 unsigned char addr;50 unsigned char data;51 } nl8048_init_seq[] = {52 { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 },53 { 5, 0x14 }, { 6, 0x24 }, { 16, 0xd7 }, { 17, 0x00 },54 { 18, 0x00 }, { 19, 0x55 }, { 20, 0x01 }, { 21, 0x70 },55 { 22, 0x1e }, { 23, 0x25 }, { 24, 0x25 }, { 25, 0x02 },56 { 26, 0x02 }, { 27, 0xa0 }, { 32, 0x2f }, { 33, 0x0f },57 { 34, 0x0f }, { 35, 0x0f }, { 36, 0x0f }, { 37, 0x0f },58 { 38, 0x0f }, { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 },59 { 42, 0x02 }, { 43, 0x0f }, { 44, 0x0f }, { 45, 0x0f },60 { 46, 0x0f }, { 47, 0x0f }, { 48, 0x0f }, { 49, 0x0f },61 { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },62 { 80, 0x0c }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 },63 { 86, 0x14 }, { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 },64 { 92, 0x02 }, { 93, 0x0c }, { 94, 0x1c }, { 95, 0x27 },65 { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 }, { 103, 0x27 },66 { 112, 0x01 }, { 113, 0x0e }, { 114, 0x02 }, { 115, 0x0c },67 { 118, 0x0c }, { 121, 0x30 }, { 130, 0x00 }, { 131, 0x00 },68 { 132, 0xfc }, { 134, 0x00 }, { 136, 0x00 }, { 138, 0x00 },69 { 139, 0x00 }, { 140, 0x00 }, { 141, 0xfc }, { 143, 0x00 },70 { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 }, { 149, 0x00 },71 { 150, 0xfc }, { 152, 0x00 }, { 154, 0x00 }, { 156, 0x00 },72 { 157, 0x00 },73 };74 75 unsigned int i;76 int ret;77 78 for (i = 0; i < ARRAY_SIZE(nl8048_init_seq); ++i) {79 ret = nl8048_write(lcd, nl8048_init_seq[i].addr,80 nl8048_init_seq[i].data);81 if (ret < 0)82 return ret;83 }84 85 udelay(20);86 87 return nl8048_write(lcd, 2, 0x00);88}89 90static int nl8048_disable(struct drm_panel *panel)91{92 struct nl8048_panel *lcd = to_nl8048_device(panel);93 94 gpiod_set_value_cansleep(lcd->reset_gpio, 0);95 96 return 0;97}98 99static int nl8048_enable(struct drm_panel *panel)100{101 struct nl8048_panel *lcd = to_nl8048_device(panel);102 103 gpiod_set_value_cansleep(lcd->reset_gpio, 1);104 105 return 0;106}107 108static const struct drm_display_mode nl8048_mode = {109 /* NEC PIX Clock Ratings MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz */110 .clock = 23800,111 .hdisplay = 800,112 .hsync_start = 800 + 6,113 .hsync_end = 800 + 6 + 1,114 .htotal = 800 + 6 + 1 + 4,115 .vdisplay = 480,116 .vsync_start = 480 + 3,117 .vsync_end = 480 + 3 + 1,118 .vtotal = 480 + 3 + 1 + 4,119 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,120 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,121 .width_mm = 89,122 .height_mm = 53,123};124 125static int nl8048_get_modes(struct drm_panel *panel,126 struct drm_connector *connector)127{128 struct drm_display_mode *mode;129 130 mode = drm_mode_duplicate(connector->dev, &nl8048_mode);131 if (!mode)132 return -ENOMEM;133 134 drm_mode_set_name(mode);135 drm_mode_probed_add(connector, mode);136 137 connector->display_info.width_mm = nl8048_mode.width_mm;138 connector->display_info.height_mm = nl8048_mode.height_mm;139 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH140 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE141 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;142 143 return 1;144}145 146static const struct drm_panel_funcs nl8048_funcs = {147 .disable = nl8048_disable,148 .enable = nl8048_enable,149 .get_modes = nl8048_get_modes,150};151 152static int __maybe_unused nl8048_suspend(struct device *dev)153{154 struct nl8048_panel *lcd = dev_get_drvdata(dev);155 156 nl8048_write(lcd, 2, 0x01);157 msleep(40);158 159 return 0;160}161 162static int __maybe_unused nl8048_resume(struct device *dev)163{164 struct nl8048_panel *lcd = dev_get_drvdata(dev);165 166 /* Reinitialize the panel. */167 spi_setup(lcd->spi);168 nl8048_write(lcd, 2, 0x00);169 nl8048_init(lcd);170 171 return 0;172}173 174static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume);175 176static int nl8048_probe(struct spi_device *spi)177{178 struct nl8048_panel *lcd;179 int ret;180 181 lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);182 if (!lcd)183 return -ENOMEM;184 185 spi_set_drvdata(spi, lcd);186 lcd->spi = spi;187 188 lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);189 if (IS_ERR(lcd->reset_gpio)) {190 dev_err(&spi->dev, "failed to parse reset gpio\n");191 return PTR_ERR(lcd->reset_gpio);192 }193 194 spi->mode = SPI_MODE_0;195 spi->bits_per_word = 32;196 197 ret = spi_setup(spi);198 if (ret < 0) {199 dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);200 return ret;201 }202 203 ret = nl8048_init(lcd);204 if (ret < 0)205 return ret;206 207 drm_panel_init(&lcd->panel, &lcd->spi->dev, &nl8048_funcs,208 DRM_MODE_CONNECTOR_DPI);209 210 drm_panel_add(&lcd->panel);211 212 return 0;213}214 215static void nl8048_remove(struct spi_device *spi)216{217 struct nl8048_panel *lcd = spi_get_drvdata(spi);218 219 drm_panel_remove(&lcd->panel);220 drm_panel_disable(&lcd->panel);221 drm_panel_unprepare(&lcd->panel);222}223 224static const struct of_device_id nl8048_of_match[] = {225 { .compatible = "nec,nl8048hl11", },226 { /* sentinel */ },227};228 229MODULE_DEVICE_TABLE(of, nl8048_of_match);230 231static const struct spi_device_id nl8048_ids[] = {232 { "nl8048hl11", 0 },233 { /* sentinel */ }234};235 236MODULE_DEVICE_TABLE(spi, nl8048_ids);237 238static struct spi_driver nl8048_driver = {239 .probe = nl8048_probe,240 .remove = nl8048_remove,241 .id_table = nl8048_ids,242 .driver = {243 .name = "panel-nec-nl8048hl11",244 .pm = &nl8048_pm_ops,245 .of_match_table = nl8048_of_match,246 },247};248 249module_spi_driver(nl8048_driver);250 251MODULE_AUTHOR("Erik Gilling <konkers@android.com>");252MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");253MODULE_LICENSE("GPL");254