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