drivers/gpu/drm/tinydrm/st7735r.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * DRM driver for Sitronix ST7735R panels
   4  *
   5  * Copyright 2017 David Lechner <david@lechnology.com>
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/dma-buf.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/module.h>
  12 #include <linux/property.h>
  13 #include <linux/spi/spi.h>
  14 #include <video/mipi_display.h>
  15
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_gem_framebuffer_helper.h>
  18 #include <drm/tinydrm/mipi-dbi.h>
  19 #include <drm/tinydrm/tinydrm-helpers.h>
  20
  21 #define ST7735R_FRMCTR1         0xb1
  22 #define ST7735R_FRMCTR2         0xb2
  23 #define ST7735R_FRMCTR3         0xb3
  24 #define ST7735R_INVCTR          0xb4
  25 #define ST7735R_PWCTR1          0xc0
  26 #define ST7735R_PWCTR2          0xc1
  27 #define ST7735R_PWCTR3          0xc2
  28 #define ST7735R_PWCTR4          0xc3
  29 #define ST7735R_PWCTR5          0xc4
  30 #define ST7735R_VMCTR1          0xc5
  31 #define ST7735R_GAMCTRP1        0xe0
  32 #define ST7735R_GAMCTRN1        0xe1
  33
  34 #define ST7735R_MY      BIT(7)
  35 #define ST7735R_MX      BIT(6)
  36 #define ST7735R_MV      BIT(5)
  37
  38 static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
  39                                       struct drm_crtc_state *crtc_state)
  40 {
  41         struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
  42         struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
  43         struct device *dev = tdev->drm->dev;
  44         int ret;
  45         u8 addr_mode;
  46
  47         DRM_DEBUG_KMS("\n");
  48
  49         mipi_dbi_hw_reset(mipi);
  50
  51         ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
  52         if (ret) {
  53                 DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
  54                 return;
  55         }
  56
  57         msleep(150);
  58
  59         mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
  60         msleep(500);
  61
  62         mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
  63         mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
  64         mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
  65                          0x2d);
  66         mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
  67         mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
  68         mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
  69         mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
  70         mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
  71         mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
  72         mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
  73         mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
  74         switch (mipi->rotation) {
  75         default:
  76                 addr_mode = ST7735R_MX | ST7735R_MY;
  77                 break;
  78         case 90:
  79                 addr_mode = ST7735R_MX | ST7735R_MV;
  80                 break;
  81         case 180:
  82                 addr_mode = 0;
  83                 break;
  84         case 270:
  85                 addr_mode = ST7735R_MY | ST7735R_MV;
  86                 break;
  87         }
  88         mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
  89         mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
  90                          MIPI_DCS_PIXEL_FMT_16BIT);
  91         mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
  92                          0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
  93                          0x03, 0x10);
  94         mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
  95                          0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
  96                          0x02, 0x10);
  97         mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
  98
  99         msleep(100);
 100
 101         mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
 102
 103         msleep(20);
 104
 105         mipi_dbi_pipe_enable(pipe, crtc_state);
 106 }
 107
 108 static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
 109         .enable         = jd_t18003_t01_pipe_enable,
 110         .disable        = mipi_dbi_pipe_disable,
 111         .update         = tinydrm_display_pipe_update,
 112         .prepare_fb     = tinydrm_display_pipe_prepare_fb,
 113 };
 114
 115 static const struct drm_display_mode jd_t18003_t01_mode = {
 116         TINYDRM_MODE(128, 160, 28, 35),
 117 };
 118
 119 DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
 120
 121 static struct drm_driver st7735r_driver = {
 122         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
 123                                   DRIVER_ATOMIC,
 124         .fops                   = &st7735r_fops,
 125         TINYDRM_GEM_DRIVER_OPS,
 126         .lastclose              = drm_fb_helper_lastclose,
 127         .debugfs_init           = mipi_dbi_debugfs_init,
 128         .name                   = "st7735r",
 129         .desc                   = "Sitronix ST7735R",
 130         .date                   = "20171128",
 131         .major                  = 1,
 132         .minor                  = 0,
 133 };
 134
 135 static const struct of_device_id st7735r_of_match[] = {
 136         { .compatible = "jianda,jd-t18003-t01" },
 137         { },
 138 };
 139 MODULE_DEVICE_TABLE(of, st7735r_of_match);
 140
 141 static const struct spi_device_id st7735r_id[] = {
 142         { "jd-t18003-t01", 0 },
 143         { },
 144 };
 145 MODULE_DEVICE_TABLE(spi, st7735r_id);
 146
 147 static int st7735r_probe(struct spi_device *spi)
 148 {
 149         struct device *dev = &spi->dev;
 150         struct mipi_dbi *mipi;
 151         struct gpio_desc *dc;
 152         u32 rotation = 0;
 153         int ret;
 154
 155         mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
 156         if (!mipi)
 157                 return -ENOMEM;
 158
 159         mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 160         if (IS_ERR(mipi->reset)) {
 161                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 162                 return PTR_ERR(mipi->reset);
 163         }
 164
 165         dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
 166         if (IS_ERR(dc)) {
 167                 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
 168                 return PTR_ERR(dc);
 169         }
 170
 171         mipi->backlight = tinydrm_of_find_backlight(dev);
 172         if (IS_ERR(mipi->backlight))
 173                 return PTR_ERR(mipi->backlight);
 174
 175         device_property_read_u32(dev, "rotation", &rotation);
 176
 177         ret = mipi_dbi_spi_init(spi, mipi, dc);
 178         if (ret)
 179                 return ret;
 180
 181         /* Cannot read from Adafruit 1.8" display via SPI */
 182         mipi->read_commands = NULL;
 183
 184         ret = mipi_dbi_init(&spi->dev, mipi, &jd_t18003_t01_pipe_funcs,
 185                             &st7735r_driver, &jd_t18003_t01_mode, rotation);
 186         if (ret)
 187                 return ret;
 188
 189         spi_set_drvdata(spi, mipi);
 190
 191         return devm_tinydrm_register(&mipi->tinydrm);
 192 }
 193
 194 static void st7735r_shutdown(struct spi_device *spi)
 195 {
 196         struct mipi_dbi *mipi = spi_get_drvdata(spi);
 197
 198         tinydrm_shutdown(&mipi->tinydrm);
 199 }
 200
 201 static struct spi_driver st7735r_spi_driver = {
 202         .driver = {
 203                 .name = "st7735r",
 204                 .owner = THIS_MODULE,
 205                 .of_match_table = st7735r_of_match,
 206         },
 207         .id_table = st7735r_id,
 208         .probe = st7735r_probe,
 209         .shutdown = st7735r_shutdown,
 210 };
 211 module_spi_driver(st7735r_spi_driver);
 212
 213 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
 214 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 215 MODULE_LICENSE("GPL");