1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * NEC NL8048HL11 Panel Driver 4 * 5 * Copyright (C) 2019 Texas Instruments Incorporated 6 * 7 * Based on the omapdrm-specific panel-nec-nl8048hl11 driver 8 * 9 * Copyright (C) 2010 Texas Instruments Incorporated 10 * 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 23 struct 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 32 static 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 46 static 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 90 static 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 99 static 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 } 107 108 static 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 }; 124 125 static 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_HIGH 140 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE 141 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; 142 143 return 1; 144 } 145 146 static const struct drm_panel_funcs nl8048_funcs = { 147 .disable = nl8048_disable, 148 .enable = nl8048_enable, 149 .get_modes = nl8048_get_modes, 150 }; 151 152 static 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 } 161 162 static 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 } 173 174 static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume); 175 176 static 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 } 214 215 static 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 } 223 224 static const struct of_device_id nl8048_of_match[] = { 225 { .compatible = "nec,nl8048hl11", }, 226 { /* sentinel */ }, 227 }; 228 229 MODULE_DEVICE_TABLE(of, nl8048_of_match); 230 231 static const struct spi_device_id nl8048_ids[] = { 232 { "nl8048hl11", 0 }, 233 { /* sentinel */ } 234 }; 235 236 MODULE_DEVICE_TABLE(spi, nl8048_ids); 237 238 static 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 }; 248 249 module_spi_driver(nl8048_driver); 250 251 MODULE_AUTHOR("Erik Gilling <konkers@android.com>"); 252 MODULE_DESCRIPTION("NEC-NL8048HL11 Driver"); 253 MODULE_LICENSE("GPL"); 254