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_atomic_helper.h>
  18 #include <drm/drm_drv.h>
  19 #include <drm/drm_fb_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_gem_framebuffer_helper.h>
  22 #include <drm/tinydrm/mipi-dbi.h>
  23
  24 #define ST7735R_FRMCTR1         0xb1
  25 #define ST7735R_FRMCTR2         0xb2
  26 #define ST7735R_FRMCTR3         0xb3
  27 #define ST7735R_INVCTR          0xb4
  28 #define ST7735R_PWCTR1          0xc0
  29 #define ST7735R_PWCTR2          0xc1
  30 #define ST7735R_PWCTR3          0xc2
  31 #define ST7735R_PWCTR4          0xc3
  32 #define ST7735R_PWCTR5          0xc4
  33 #define ST7735R_VMCTR1          0xc5
  34 #define ST7735R_GAMCTRP1        0xe0
  35 #define ST7735R_GAMCTRN1        0xe1
  36
  37 #define ST7735R_MY      BIT(7)
  38 #define ST7735R_MX      BIT(6)
  39 #define ST7735R_MV      BIT(5)
  40
  41 static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
  42                                       struct drm_crtc_state *crtc_state,
  43                                       struct drm_plane_state *plane_state)
  44 {
  45         struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
  46         int ret, idx;
  47         u8 addr_mode;
  48
  49         if (!drm_dev_enter(pipe->crtc.dev, &idx))
  50                 return;
  51
  52         DRM_DEBUG_KMS("\n");
  53
  54         ret = mipi_dbi_poweron_reset(mipi);
  55         if (ret)
  56                 goto out_exit;
  57
  58         msleep(150);
  59
  60         mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
  61         msleep(500);
  62
  63         mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
  64         mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
  65         mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
  66                          0x2d);
  67         mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
  68         mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
  69         mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
  70         mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
  71         mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
  72         mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
  73         mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
  74         mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
  75         switch (mipi->rotation) {
  76         default:
  77                 addr_mode = ST7735R_MX | ST7735R_MY;
  78                 break;
  79         case 90:
  80                 addr_mode = ST7735R_MX | ST7735R_MV;
  81                 break;
  82         case 180:
  83                 addr_mode = 0;
  84                 break;
  85         case 270:
  86                 addr_mode = ST7735R_MY | ST7735R_MV;
  87                 break;
  88         }
  89         mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
  90         mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
  91                          MIPI_DCS_PIXEL_FMT_16BIT);
  92         mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
  93                          0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
  94                          0x03, 0x10);
  95         mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
  96                          0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
  97                          0x02, 0x10);
  98         mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
  99
 100         msleep(100);
 101
 102         mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
 103
 104         msleep(20);
 105
 106         mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
 107 out_exit:
 108         drm_dev_exit(idx);
 109 }
 110
 111 static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
 112         .enable         = jd_t18003_t01_pipe_enable,
 113         .disable        = mipi_dbi_pipe_disable,
 114         .update         = mipi_dbi_pipe_update,
 115         .prepare_fb     = drm_gem_fb_simple_display_pipe_prepare_fb,
 116 };
 117
 118 static const struct drm_display_mode jd_t18003_t01_mode = {
 119         DRM_SIMPLE_MODE(128, 160, 28, 35),
 120 };
 121
 122 DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
 123
 124 static struct drm_driver st7735r_driver = {
 125         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 126         .fops                   = &st7735r_fops,
 127         .release                = mipi_dbi_release,
 128         DRM_GEM_CMA_VMAP_DRIVER_OPS,
 129         .debugfs_init           = mipi_dbi_debugfs_init,
 130         .name                   = "st7735r",
 131         .desc                   = "Sitronix ST7735R",
 132         .date                   = "20171128",
 133         .major                  = 1,
 134         .minor                  = 0,
 135 };
 136
 137 static const struct of_device_id st7735r_of_match[] = {
 138         { .compatible = "jianda,jd-t18003-t01" },
 139         { },
 140 };
 141 MODULE_DEVICE_TABLE(of, st7735r_of_match);
 142
 143 static const struct spi_device_id st7735r_id[] = {
 144         { "jd-t18003-t01", 0 },
 145         { },
 146 };
 147 MODULE_DEVICE_TABLE(spi, st7735r_id);
 148
 149 static int st7735r_probe(struct spi_device *spi)
 150 {
 151         struct device *dev = &spi->dev;
 152         struct drm_device *drm;
 153         struct mipi_dbi *mipi;
 154         struct gpio_desc *dc;
 155         u32 rotation = 0;
 156         int ret;
 157
 158         mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
 159         if (!mipi)
 160                 return -ENOMEM;
 161
 162         drm = &mipi->drm;
 163         ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
 164         if (ret) {
 165                 kfree(mipi);
 166                 return ret;
 167         }
 168
 169         drm_mode_config_init(drm);
 170
 171         mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 172         if (IS_ERR(mipi->reset)) {
 173                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 174                 return PTR_ERR(mipi->reset);
 175         }
 176
 177         dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
 178         if (IS_ERR(dc)) {
 179                 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
 180                 return PTR_ERR(dc);
 181         }
 182
 183         mipi->backlight = devm_of_find_backlight(dev);
 184         if (IS_ERR(mipi->backlight))
 185                 return PTR_ERR(mipi->backlight);
 186
 187         device_property_read_u32(dev, "rotation", &rotation);
 188
 189         ret = mipi_dbi_spi_init(spi, mipi, dc);
 190         if (ret)
 191                 return ret;
 192
 193         /* Cannot read from Adafruit 1.8" display via SPI */
 194         mipi->read_commands = NULL;
 195
 196         ret = mipi_dbi_init(mipi, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation);
 197         if (ret)
 198                 return ret;
 199
 200         drm_mode_config_reset(drm);
 201
 202         ret = drm_dev_register(drm, 0);
 203         if (ret)
 204                 return ret;
 205
 206         spi_set_drvdata(spi, drm);
 207
 208         drm_fbdev_generic_setup(drm, 0);
 209
 210         return 0;
 211 }
 212
 213 static int st7735r_remove(struct spi_device *spi)
 214 {
 215         struct drm_device *drm = spi_get_drvdata(spi);
 216
 217         drm_dev_unplug(drm);
 218         drm_atomic_helper_shutdown(drm);
 219
 220         return 0;
 221 }
 222
 223 static void st7735r_shutdown(struct spi_device *spi)
 224 {
 225         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 226 }
 227
 228 static struct spi_driver st7735r_spi_driver = {
 229         .driver = {
 230                 .name = "st7735r",
 231                 .owner = THIS_MODULE,
 232                 .of_match_table = st7735r_of_match,
 233         },
 234         .id_table = st7735r_id,
 235         .probe = st7735r_probe,
 236         .remove = st7735r_remove,
 237         .shutdown = st7735r_shutdown,
 238 };
 239 module_spi_driver(st7735r_spi_driver);
 240
 241 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
 242 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 243 MODULE_LICENSE("GPL");