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