drm/panel/panel-nec-nl8048hl11.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * NEC NL8048HL11 Panel Driver
0004  *
0005  * Copyright (C) 2019 Texas Instruments Incorporated
0006  *
0007  * Based on the omapdrm-specific panel-nec-nl8048hl11 driver
0008  *
0009  * Copyright (C) 2010 Texas Instruments Incorporated
0010  * Author: Erik Gilling <konkers@android.com>
0011  */
0012
0013 #include <linux/delay.h>
0014 #include <linux/gpio/consumer.h>
0015 #include <linux/module.h>
0016 #include <linux/pm.h>
0017 #include <linux/spi/spi.h>
0018
0019 #include <drm/drm_connector.h>
0020 #include <drm/drm_modes.h>
0021 #include <drm/drm_panel.h>
0022
0023 struct nl8048_panel {
0024     struct drm_panel panel;
0025
0026     struct spi_device *spi;
0027     struct gpio_desc *reset_gpio;
0028 };
0029
0030 #define to_nl8048_device(p) container_of(p, struct nl8048_panel, panel)
0031
0032 static int nl8048_write(struct nl8048_panel *lcd, unsigned char addr,
0033             unsigned char value)
0034 {
0035     u8 data[4] = { value, 0x01, addr, 0x00 };
0036     int ret;
0037
0038     ret = spi_write(lcd->spi, data, sizeof(data));
0039     if (ret)
0040         dev_err(&lcd->spi->dev, "SPI write to %u failed: %d\n",
0041             addr, ret);
0042
0043     return ret;
0044 }
0045
0046 static int nl8048_init(struct nl8048_panel *lcd)
0047 {
0048     static const struct {
0049         unsigned char addr;
0050         unsigned char data;
0051     } nl8048_init_seq[] = {
0052         {   3, 0x01 }, {   0, 0x00 }, {   1, 0x01 }, {   4, 0x00 },
0053         {   5, 0x14 }, {   6, 0x24 }, {  16, 0xd7 }, {  17, 0x00 },
0054         {  18, 0x00 }, {  19, 0x55 }, {  20, 0x01 }, {  21, 0x70 },
0055         {  22, 0x1e }, {  23, 0x25 }, {  24, 0x25 }, {  25, 0x02 },
0056         {  26, 0x02 }, {  27, 0xa0 }, {  32, 0x2f }, {  33, 0x0f },
0057         {  34, 0x0f }, {  35, 0x0f }, {  36, 0x0f }, {  37, 0x0f },
0058         {  38, 0x0f }, {  39, 0x00 }, {  40, 0x02 }, {  41, 0x02 },
0059         {  42, 0x02 }, {  43, 0x0f }, {  44, 0x0f }, {  45, 0x0f },
0060         {  46, 0x0f }, {  47, 0x0f }, {  48, 0x0f }, {  49, 0x0f },
0061         {  50, 0x00 }, {  51, 0x02 }, {  52, 0x02 }, {  53, 0x02 },
0062         {  80, 0x0c }, {  83, 0x42 }, {  84, 0x42 }, {  85, 0x41 },
0063         {  86, 0x14 }, {  89, 0x88 }, {  90, 0x01 }, {  91, 0x00 },
0064         {  92, 0x02 }, {  93, 0x0c }, {  94, 0x1c }, {  95, 0x27 },
0065         {  98, 0x49 }, {  99, 0x27 }, { 102, 0x76 }, { 103, 0x27 },
0066         { 112, 0x01 }, { 113, 0x0e }, { 114, 0x02 }, { 115, 0x0c },
0067         { 118, 0x0c }, { 121, 0x30 }, { 130, 0x00 }, { 131, 0x00 },
0068         { 132, 0xfc }, { 134, 0x00 }, { 136, 0x00 }, { 138, 0x00 },
0069         { 139, 0x00 }, { 140, 0x00 }, { 141, 0xfc }, { 143, 0x00 },
0070         { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 }, { 149, 0x00 },
0071         { 150, 0xfc }, { 152, 0x00 }, { 154, 0x00 }, { 156, 0x00 },
0072         { 157, 0x00 },
0073     };
0074
0075     unsigned int i;
0076     int ret;
0077
0078     for (i = 0; i < ARRAY_SIZE(nl8048_init_seq); ++i) {
0079         ret = nl8048_write(lcd, nl8048_init_seq[i].addr,
0080                    nl8048_init_seq[i].data);
0081         if (ret < 0)
0082             return ret;
0083     }
0084
0085     udelay(20);
0086
0087     return nl8048_write(lcd, 2, 0x00);
0088 }
0089
0090 static int nl8048_disable(struct drm_panel *panel)
0091 {
0092     struct nl8048_panel *lcd = to_nl8048_device(panel);
0093
0094     gpiod_set_value_cansleep(lcd->reset_gpio, 0);
0095
0096     return 0;
0097 }
0098
0099 static int nl8048_enable(struct drm_panel *panel)
0100 {
0101     struct nl8048_panel *lcd = to_nl8048_device(panel);
0102
0103     gpiod_set_value_cansleep(lcd->reset_gpio, 1);
0104
0105     return 0;
0106 }
0107
0108 static const struct drm_display_mode nl8048_mode = {
0109     /*  NEC PIX Clock Ratings MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz */
0110     .clock  = 23800,
0111     .hdisplay = 800,
0112     .hsync_start = 800 + 6,
0113     .hsync_end = 800 + 6 + 1,
0114     .htotal = 800 + 6 + 1 + 4,
0115     .vdisplay = 480,
0116     .vsync_start = 480 + 3,
0117     .vsync_end = 480 + 3 + 1,
0118     .vtotal = 480 + 3 + 1 + 4,
0119     .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
0120     .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
0121     .width_mm = 89,
0122     .height_mm = 53,
0123 };
0124
0125 static int nl8048_get_modes(struct drm_panel *panel,
0126                 struct drm_connector *connector)
0127 {
0128     struct drm_display_mode *mode;
0129
0130     mode = drm_mode_duplicate(connector->dev, &nl8048_mode);
0131     if (!mode)
0132         return -ENOMEM;
0133
0134     drm_mode_set_name(mode);
0135     drm_mode_probed_add(connector, mode);
0136
0137     connector->display_info.width_mm = nl8048_mode.width_mm;
0138     connector->display_info.height_mm = nl8048_mode.height_mm;
0139     connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
0140                       | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
0141                       | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
0142
0143     return 1;
0144 }
0145
0146 static const struct drm_panel_funcs nl8048_funcs = {
0147     .disable = nl8048_disable,
0148     .enable = nl8048_enable,
0149     .get_modes = nl8048_get_modes,
0150 };
0151
0152 static int __maybe_unused nl8048_suspend(struct device *dev)
0153 {
0154     struct nl8048_panel *lcd = dev_get_drvdata(dev);
0155
0156     nl8048_write(lcd, 2, 0x01);
0157     msleep(40);
0158
0159     return 0;
0160 }
0161
0162 static int __maybe_unused nl8048_resume(struct device *dev)
0163 {
0164     struct nl8048_panel *lcd = dev_get_drvdata(dev);
0165
0166     /* Reinitialize the panel. */
0167     spi_setup(lcd->spi);
0168     nl8048_write(lcd, 2, 0x00);
0169     nl8048_init(lcd);
0170
0171     return 0;
0172 }
0173
0174 static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume);
0175
0176 static int nl8048_probe(struct spi_device *spi)
0177 {
0178     struct nl8048_panel *lcd;
0179     int ret;
0180
0181     lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
0182     if (!lcd)
0183         return -ENOMEM;
0184
0185     spi_set_drvdata(spi, lcd);
0186     lcd->spi = spi;
0187
0188     lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
0189     if (IS_ERR(lcd->reset_gpio)) {
0190         dev_err(&spi->dev, "failed to parse reset gpio\n");
0191         return PTR_ERR(lcd->reset_gpio);
0192     }
0193
0194     spi->mode = SPI_MODE_0;
0195     spi->bits_per_word = 32;
0196
0197     ret = spi_setup(spi);
0198     if (ret < 0) {
0199         dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
0200         return ret;
0201     }
0202
0203     ret = nl8048_init(lcd);
0204     if (ret < 0)
0205         return ret;
0206
0207     drm_panel_init(&lcd->panel, &lcd->spi->dev, &nl8048_funcs,
0208                DRM_MODE_CONNECTOR_DPI);
0209
0210     drm_panel_add(&lcd->panel);
0211
0212     return 0;
0213 }
0214
0215 static void nl8048_remove(struct spi_device *spi)
0216 {
0217     struct nl8048_panel *lcd = spi_get_drvdata(spi);
0218
0219     drm_panel_remove(&lcd->panel);
0220     drm_panel_disable(&lcd->panel);
0221     drm_panel_unprepare(&lcd->panel);
0222 }
0223
0224 static const struct of_device_id nl8048_of_match[] = {
0225     { .compatible = "nec,nl8048hl11", },
0226     { /* sentinel */ },
0227 };
0228
0229 MODULE_DEVICE_TABLE(of, nl8048_of_match);
0230
0231 static const struct spi_device_id nl8048_ids[] = {
0232     { "nl8048hl11", 0 },
0233     { /* sentinel */ }
0234 };
0235
0236 MODULE_DEVICE_TABLE(spi, nl8048_ids);
0237
0238 static struct spi_driver nl8048_driver = {
0239     .probe      = nl8048_probe,
0240     .remove     = nl8048_remove,
0241     .id_table   = nl8048_ids,
0242     .driver     = {
0243         .name   = "panel-nec-nl8048hl11",
0244         .pm = &nl8048_pm_ops,
0245         .of_match_table = nl8048_of_match,
0246     },
0247 };
0248
0249 module_spi_driver(nl8048_driver);
0250
0251 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
0252 MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
0253 MODULE_LICENSE("GPL");