drivers/gpu/drm/tiny/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  * Copyright (C) 2019 Glider bvba
   7  */
   8
   9 #include <linux/backlight.h>
  10 #include <linux/delay.h>
  11 #include <linux/dma-buf.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/module.h>
  14 #include <linux/of_device.h>
  15 #include <linux/property.h>
  16 #include <linux/spi/spi.h>
  17 #include <video/mipi_display.h>
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_drv.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_gem_cma_helper.h>
  23 #include <drm/drm_gem_framebuffer_helper.h>
  24 #include <drm/drm_mipi_dbi.h>
  25
  26 #define ST7735R_FRMCTR1         0xb1
  27 #define ST7735R_FRMCTR2         0xb2
  28 #define ST7735R_FRMCTR3         0xb3
  29 #define ST7735R_INVCTR          0xb4
  30 #define ST7735R_PWCTR1          0xc0
  31 #define ST7735R_PWCTR2          0xc1
  32 #define ST7735R_PWCTR3          0xc2
  33 #define ST7735R_PWCTR4          0xc3
  34 #define ST7735R_PWCTR5          0xc4
  35 #define ST7735R_VMCTR1          0xc5
  36 #define ST7735R_GAMCTRP1        0xe0
  37 #define ST7735R_GAMCTRN1        0xe1
  38
  39 #define ST7735R_MY      BIT(7)
  40 #define ST7735R_MX      BIT(6)
  41 #define ST7735R_MV      BIT(5)
  42 #define ST7735R_RGB     BIT(3)
  43
  44 struct st7735r_cfg {
  45         const struct drm_display_mode mode;
  46         unsigned int left_offset;
  47         unsigned int top_offset;
  48         unsigned int write_only:1;
  49         unsigned int rgb:1;             /* RGB (vs. BGR) */
  50 };
  51
  52 struct st7735r_priv {
  53         struct mipi_dbi_dev dbidev;     /* Must be first for .release() */
  54         const struct st7735r_cfg *cfg;
  55 };
  56
  57 static void st7735r_pipe_enable(struct drm_simple_display_pipe *pipe,
  58                                 struct drm_crtc_state *crtc_state,
  59                                 struct drm_plane_state *plane_state)
  60 {
  61         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
  62         struct st7735r_priv *priv = container_of(dbidev, struct st7735r_priv,
  63                                                  dbidev);
  64         struct mipi_dbi *dbi = &dbidev->dbi;
  65         int ret, idx;
  66         u8 addr_mode;
  67
  68         if (!drm_dev_enter(pipe->crtc.dev, &idx))
  69                 return;
  70
  71         DRM_DEBUG_KMS("\n");
  72
  73         ret = mipi_dbi_poweron_reset(dbidev);
  74         if (ret)
  75                 goto out_exit;
  76
  77         msleep(150);
  78
  79         mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
  80         msleep(500);
  81
  82         mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
  83         mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
  84         mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
  85                          0x2d);
  86         mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);
  87         mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
  88         mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);
  89         mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);
  90         mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);
  91         mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);
  92         mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);
  93         mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
  94         switch (dbidev->rotation) {
  95         default:
  96                 addr_mode = ST7735R_MX | ST7735R_MY;
  97                 break;
  98         case 90:
  99                 addr_mode = ST7735R_MX | ST7735R_MV;
 100                 break;
 101         case 180:
 102                 addr_mode = 0;
 103                 break;
 104         case 270:
 105                 addr_mode = ST7735R_MY | ST7735R_MV;
 106                 break;
 107         }
 108
 109         if (priv->cfg->rgb)
 110                 addr_mode |= ST7735R_RGB;
 111
 112         mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
 113         mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
 114                          MIPI_DCS_PIXEL_FMT_16BIT);
 115         mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
 116                          0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
 117                          0x03, 0x10);
 118         mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
 119                          0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
 120                          0x02, 0x10);
 121         mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
 122
 123         msleep(100);
 124
 125         mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
 126
 127         msleep(20);
 128
 129         mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
 130 out_exit:
 131         drm_dev_exit(idx);
 132 }
 133
 134 static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = {
 135         .enable         = st7735r_pipe_enable,
 136         .disable        = mipi_dbi_pipe_disable,
 137         .update         = mipi_dbi_pipe_update,
 138         .prepare_fb     = drm_gem_fb_simple_display_pipe_prepare_fb,
 139 };
 140
 141 static const struct st7735r_cfg jd_t18003_t01_cfg = {
 142         .mode           = { DRM_SIMPLE_MODE(128, 160, 28, 35) },
 143         /* Cannot read from Adafruit 1.8" display via SPI */
 144         .write_only     = true,
 145 };
 146
 147 };
 148
 149 DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
 150
 151 static struct drm_driver st7735r_driver = {
 152         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 153         .fops                   = &st7735r_fops,
 154         .release                = mipi_dbi_release,
 155         DRM_GEM_CMA_VMAP_DRIVER_OPS,
 156         .debugfs_init           = mipi_dbi_debugfs_init,
 157         .name                   = "st7735r",
 158         .desc                   = "Sitronix ST7735R",
 159         .date                   = "20171128",
 160         .major                  = 1,
 161         .minor                  = 0,
 162 };
 163
 164 static const struct of_device_id st7735r_of_match[] = {
 165         { .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg },
 166         { },
 167 };
 168 MODULE_DEVICE_TABLE(of, st7735r_of_match);
 169
 170 static const struct spi_device_id st7735r_id[] = {
 171         { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },
 172         { },
 173 };
 174 MODULE_DEVICE_TABLE(spi, st7735r_id);
 175
 176 static int st7735r_probe(struct spi_device *spi)
 177 {
 178         struct device *dev = &spi->dev;
 179         const struct st7735r_cfg *cfg;
 180         struct mipi_dbi_dev *dbidev;
 181         struct st7735r_priv *priv;
 182         struct drm_device *drm;
 183         struct mipi_dbi *dbi;
 184         struct gpio_desc *dc;
 185         u32 rotation = 0;
 186         int ret;
 187
 188         cfg = of_device_get_match_data(&spi->dev);
 189         if (!cfg)
 190                 cfg = (void *)spi_get_device_id(spi)->driver_data;
 191
 192         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 193         if (!priv)
 194                 return -ENOMEM;
 195
 196         dbidev = &priv->dbidev;
 197         priv->cfg = cfg;
 198
 199         dbi = &dbidev->dbi;
 200         drm = &dbidev->drm;
 201         ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
 202         if (ret) {
 203                 kfree(dbidev);
 204                 return ret;
 205         }
 206
 207         drm_mode_config_init(drm);
 208
 209         dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 210         if (IS_ERR(dbi->reset)) {
 211                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 212                 return PTR_ERR(dbi->reset);
 213         }
 214
 215         dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
 216         if (IS_ERR(dc)) {
 217                 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
 218                 return PTR_ERR(dc);
 219         }
 220
 221         dbidev->backlight = devm_of_find_backlight(dev);
 222         if (IS_ERR(dbidev->backlight))
 223                 return PTR_ERR(dbidev->backlight);
 224
 225         device_property_read_u32(dev, "rotation", &rotation);
 226
 227         ret = mipi_dbi_spi_init(spi, dbi, dc);
 228         if (ret)
 229                 return ret;
 230
 231         if (cfg->write_only)
 232                 dbi->read_commands = NULL;
 233
 234         dbidev->left_offset = cfg->left_offset;
 235         dbidev->top_offset = cfg->top_offset;
 236
 237         ret = mipi_dbi_dev_init(dbidev, &st7735r_pipe_funcs, &cfg->mode,
 238                                 rotation);
 239         if (ret)
 240                 return ret;
 241
 242         drm_mode_config_reset(drm);
 243
 244         ret = drm_dev_register(drm, 0);
 245         if (ret)
 246                 return ret;
 247
 248         spi_set_drvdata(spi, drm);
 249
 250         drm_fbdev_generic_setup(drm, 0);
 251
 252         return 0;
 253 }
 254
 255 static int st7735r_remove(struct spi_device *spi)
 256 {
 257         struct drm_device *drm = spi_get_drvdata(spi);
 258
 259         drm_dev_unplug(drm);
 260         drm_atomic_helper_shutdown(drm);
 261
 262         return 0;
 263 }
 264
 265 static void st7735r_shutdown(struct spi_device *spi)
 266 {
 267         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 268 }
 269
 270 static struct spi_driver st7735r_spi_driver = {
 271         .driver = {
 272                 .name = "st7735r",
 273                 .owner = THIS_MODULE,
 274                 .of_match_table = st7735r_of_match,
 275         },
 276         .id_table = st7735r_id,
 277         .probe = st7735r_probe,
 278         .remove = st7735r_remove,
 279         .shutdown = st7735r_shutdown,
 280 };
 281 module_spi_driver(st7735r_spi_driver);
 282
 283 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
 284 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 285 MODULE_LICENSE("GPL");