drivers/gpu/drm/panel/panel-nec-nl8048hl11.c

   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         .vrefresh = 60,
 120         .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 121         .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
 122         .width_mm = 89,
 123         .height_mm = 53,
 124 };
 125
 126 static int nl8048_get_modes(struct drm_panel *panel,
 127                             struct drm_connector *connector)
 128 {
 129         struct drm_display_mode *mode;
 130
 131         mode = drm_mode_duplicate(connector->dev, &nl8048_mode);
 132         if (!mode)
 133                 return -ENOMEM;
 134
 135         drm_mode_set_name(mode);
 136         drm_mode_probed_add(connector, mode);
 137
 138         connector->display_info.width_mm = nl8048_mode.width_mm;
 139         connector->display_info.height_mm = nl8048_mode.height_mm;
 140         connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
 141                                           | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
 142                                           | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
 143
 144         return 1;
 145 }
 146
 147 static const struct drm_panel_funcs nl8048_funcs = {
 148         .disable = nl8048_disable,
 149         .enable = nl8048_enable,
 150         .get_modes = nl8048_get_modes,
 151 };
 152
 153 static int __maybe_unused nl8048_suspend(struct device *dev)
 154 {
 155         struct nl8048_panel *lcd = dev_get_drvdata(dev);
 156
 157         nl8048_write(lcd, 2, 0x01);
 158         msleep(40);
 159
 160         return 0;
 161 }
 162
 163 static int __maybe_unused nl8048_resume(struct device *dev)
 164 {
 165         struct nl8048_panel *lcd = dev_get_drvdata(dev);
 166
 167         /* Reinitialize the panel. */
 168         spi_setup(lcd->spi);
 169         nl8048_write(lcd, 2, 0x00);
 170         nl8048_init(lcd);
 171
 172         return 0;
 173 }
 174
 175 static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume);
 176
 177 static int nl8048_probe(struct spi_device *spi)
 178 {
 179         struct nl8048_panel *lcd;
 180         int ret;
 181
 182         lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
 183         if (!lcd)
 184                 return -ENOMEM;
 185
 186         spi_set_drvdata(spi, lcd);
 187         lcd->spi = spi;
 188
 189         lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
 190         if (IS_ERR(lcd->reset_gpio)) {
 191                 dev_err(&spi->dev, "failed to parse reset gpio\n");
 192                 return PTR_ERR(lcd->reset_gpio);
 193         }
 194
 195         spi->mode = SPI_MODE_0;
 196         spi->bits_per_word = 32;
 197
 198         ret = spi_setup(spi);
 199         if (ret < 0) {
 200                 dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
 201                 return ret;
 202         }
 203
 204         ret = nl8048_init(lcd);
 205         if (ret < 0)
 206                 return ret;
 207
 208         drm_panel_init(&lcd->panel, &lcd->spi->dev, &nl8048_funcs,
 209                        DRM_MODE_CONNECTOR_DPI);
 210
 211         return drm_panel_add(&lcd->panel);
 212 }
 213
 214 static int nl8048_remove(struct spi_device *spi)
 215 {
 216         struct nl8048_panel *lcd = spi_get_drvdata(spi);
 217
 218         drm_panel_remove(&lcd->panel);
 219         drm_panel_disable(&lcd->panel);
 220         drm_panel_unprepare(&lcd->panel);
 221
 222         return 0;
 223 }
 224
 225 static const struct of_device_id nl8048_of_match[] = {
 226         { .compatible = "nec,nl8048hl11", },
 227         { /* sentinel */ },
 228 };
 229
 230 MODULE_DEVICE_TABLE(of, nl8048_of_match);
 231
 232 static const struct spi_device_id nl8048_ids[] = {
 233         { "nl8048hl11", 0 },
 234         { /* sentinel */ }
 235 };
 236
 237 MODULE_DEVICE_TABLE(spi, nl8048_ids);
 238
 239 static struct spi_driver nl8048_driver = {
 240         .probe          = nl8048_probe,
 241         .remove         = nl8048_remove,
 242         .id_table       = nl8048_ids,
 243         .driver         = {
 244                 .name   = "panel-nec-nl8048hl11",
 245                 .pm     = &nl8048_pm_ops,
 246                 .of_match_table = nl8048_of_match,
 247         },
 248 };
 249
 250 module_spi_driver(nl8048_driver);
 251
 252 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
 253 MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
 254 MODULE_LICENSE("GPL");