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