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/drm_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_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); 46 struct mipi_dbi *dbi = &dbidev->dbi; 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(dbidev); 56 if (ret) 57 goto out_exit; 58 59 msleep(150); 60 61 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); 62 msleep(500); 63 64 mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d); 65 mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d); 66 mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c, 67 0x2d); 68 mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07); 69 mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84); 70 mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5); 71 mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00); 72 mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a); 73 mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee); 74 mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e); 75 mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE); 76 switch (dbidev->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(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); 91 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 92 MIPI_DCS_PIXEL_FMT_16BIT); 93 mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37, 94 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01, 95 0x03, 0x10); 96 mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e, 97 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00, 98 0x02, 0x10); 99 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); 100 101 msleep(100); 102 103 mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE); 104 105 msleep(20); 106 107 mipi_dbi_enable_flush(dbidev, 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_ATOMIC, 127 .fops = &st7735r_fops, 128 .release = mipi_dbi_release, 129 DRM_GEM_CMA_VMAP_DRIVER_OPS, 130 .debugfs_init = mipi_dbi_debugfs_init, 131 .name = "st7735r", 132 .desc = "Sitronix ST7735R", 133 .date = "20171128", 134 .major = 1, 135 .minor = 0, 136 }; 137 138 static const struct of_device_id st7735r_of_match[] = { 139 { .compatible = "jianda,jd-t18003-t01" }, 140 { }, 141 }; 142 MODULE_DEVICE_TABLE(of, st7735r_of_match); 143 144 static const struct spi_device_id st7735r_id[] = { 145 { "jd-t18003-t01", 0 }, 146 { }, 147 }; 148 MODULE_DEVICE_TABLE(spi, st7735r_id); 149 150 static int st7735r_probe(struct spi_device *spi) 151 { 152 struct device *dev = &spi->dev; 153 struct mipi_dbi_dev *dbidev; 154 struct drm_device *drm; 155 struct mipi_dbi *dbi; 156 struct gpio_desc *dc; 157 u32 rotation = 0; 158 int ret; 159 160 dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); 161 if (!dbidev) 162 return -ENOMEM; 163 164 dbi = &dbidev->dbi; 165 drm = &dbidev->drm; 166 ret = devm_drm_dev_init(dev, drm, &st7735r_driver); 167 if (ret) { 168 kfree(dbidev); 169 return ret; 170 } 171 172 drm_mode_config_init(drm); 173 174 dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 175 if (IS_ERR(dbi->reset)) { 176 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); 177 return PTR_ERR(dbi->reset); 178 } 179 180 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW); 181 if (IS_ERR(dc)) { 182 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n"); 183 return PTR_ERR(dc); 184 } 185 186 dbidev->backlight = devm_of_find_backlight(dev); 187 if (IS_ERR(dbidev->backlight)) 188 return PTR_ERR(dbidev->backlight); 189 190 device_property_read_u32(dev, "rotation", &rotation); 191 192 ret = mipi_dbi_spi_init(spi, dbi, dc); 193 if (ret) 194 return ret; 195 196 /* Cannot read from Adafruit 1.8" display via SPI */ 197 dbi->read_commands = NULL; 198 199 ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation); 200 if (ret) 201 return ret; 202 203 drm_mode_config_reset(drm); 204 205 ret = drm_dev_register(drm, 0); 206 if (ret) 207 return ret; 208 209 spi_set_drvdata(spi, drm); 210 211 drm_fbdev_generic_setup(drm, 0); 212 213 return 0; 214 } 215 216 static int st7735r_remove(struct spi_device *spi) 217 { 218 struct drm_device *drm = spi_get_drvdata(spi); 219 220 drm_dev_unplug(drm); 221 drm_atomic_helper_shutdown(drm); 222 223 return 0; 224 } 225 226 static void st7735r_shutdown(struct spi_device *spi) 227 { 228 drm_atomic_helper_shutdown(spi_get_drvdata(spi)); 229 } 230 231 static struct spi_driver st7735r_spi_driver = { 232 .driver = { 233 .name = "st7735r", 234 .owner = THIS_MODULE, 235 .of_match_table = st7735r_of_match, 236 }, 237 .id_table = st7735r_id, 238 .probe = st7735r_probe, 239 .remove = st7735r_remove, 240 .shutdown = st7735r_shutdown, 241 }; 242 module_spi_driver(st7735r_spi_driver); 243 244 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver"); 245 MODULE_AUTHOR("David Lechner <david@lechnology.com>"); 246 MODULE_LICENSE("GPL"); 247