1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * DRM driver for Ilitek ILI9341 panels 4 * 5 * Copyright 2018 David Lechner <david@lechnology.com> 6 * 7 * Based on mi0283qt.c: 8 * Copyright 2016 Noralf Trønnes 9 */ 10 11 #include <linux/backlight.h> 12 #include <linux/delay.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/module.h> 15 #include <linux/property.h> 16 #include <linux/spi/spi.h> 17 18 #include <drm/drm_atomic_helper.h> 19 #include <drm/drm_drv.h> 20 #include <drm/drm_fb_helper.h> 21 #include <drm/drm_gem_cma_helper.h> 22 #include <drm/drm_gem_framebuffer_helper.h> 23 #include <drm/drm_mipi_dbi.h> 24 #include <drm/drm_modeset_helper.h> 25 #include <video/mipi_display.h> 26 27 #define ILI9341_FRMCTR1 0xb1 28 #define ILI9341_DISCTRL 0xb6 29 #define ILI9341_ETMOD 0xb7 30 31 #define ILI9341_PWCTRL1 0xc0 32 #define ILI9341_PWCTRL2 0xc1 33 #define ILI9341_VMCTRL1 0xc5 34 #define ILI9341_VMCTRL2 0xc7 35 #define ILI9341_PWCTRLA 0xcb 36 #define ILI9341_PWCTRLB 0xcf 37 38 #define ILI9341_PGAMCTRL 0xe0 39 #define ILI9341_NGAMCTRL 0xe1 40 #define ILI9341_DTCTRLA 0xe8 41 #define ILI9341_DTCTRLB 0xea 42 #define ILI9341_PWRSEQ 0xed 43 44 #define ILI9341_EN3GAM 0xf2 45 #define ILI9341_PUMPCTRL 0xf7 46 47 #define ILI9341_MADCTL_BGR BIT(3) 48 #define ILI9341_MADCTL_MV BIT(5) 49 #define ILI9341_MADCTL_MX BIT(6) 50 #define ILI9341_MADCTL_MY BIT(7) 51 52 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe, 53 struct drm_crtc_state *crtc_state, 54 struct drm_plane_state *plane_state) 55 { 56 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); 57 struct mipi_dbi *dbi = &dbidev->dbi; 58 u8 addr_mode; 59 int ret, idx; 60 61 if (!drm_dev_enter(pipe->crtc.dev, &idx)) 62 return; 63 64 DRM_DEBUG_KMS("\n"); 65 66 ret = mipi_dbi_poweron_conditional_reset(dbidev); 67 if (ret < 0) 68 goto out_exit; 69 if (ret == 1) 70 goto out_enable; 71 72 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF); 73 74 mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30); 75 mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81); 76 mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78); 77 mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02); 78 mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20); 79 mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00); 80 81 /* Power Control */ 82 mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x23); 83 mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x10); 84 /* VCOM */ 85 mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x3e, 0x28); 86 mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0x86); 87 88 /* Memory Access Control */ 89 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT); 90 91 /* Frame Rate */ 92 mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b); 93 94 /* Gamma */ 95 mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x00); 96 mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01); 97 mipi_dbi_command(dbi, ILI9341_PGAMCTRL, 98 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1, 99 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00); 100 mipi_dbi_command(dbi, ILI9341_NGAMCTRL, 101 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1, 102 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f); 103 104 /* DDRAM */ 105 mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07); 106 107 /* Display */ 108 mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00); 109 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); 110 msleep(100); 111 112 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); 113 msleep(100); 114 115 out_enable: 116 switch (dbidev->rotation) { 117 default: 118 addr_mode = ILI9341_MADCTL_MX; 119 break; 120 case 90: 121 addr_mode = ILI9341_MADCTL_MV; 122 break; 123 case 180: 124 addr_mode = ILI9341_MADCTL_MY; 125 break; 126 case 270: 127 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY | 128 ILI9341_MADCTL_MX; 129 break; 130 } 131 addr_mode |= ILI9341_MADCTL_BGR; 132 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); 133 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state); 134 out_exit: 135 drm_dev_exit(idx); 136 } 137 138 static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = { 139 .enable = yx240qv29_enable, 140 .disable = mipi_dbi_pipe_disable, 141 .update = mipi_dbi_pipe_update, 142 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, 143 }; 144 145 static const struct drm_display_mode yx240qv29_mode = { 146 DRM_SIMPLE_MODE(240, 320, 37, 49), 147 }; 148 149 DEFINE_DRM_GEM_CMA_FOPS(ili9341_fops); 150 151 static struct drm_driver ili9341_driver = { 152 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 153 .fops = &ili9341_fops, 154 .release = mipi_dbi_release, 155 DRM_GEM_CMA_VMAP_DRIVER_OPS, 156 .debugfs_init = mipi_dbi_debugfs_init, 157 .name = "ili9341", 158 .desc = "Ilitek ILI9341", 159 .date = "20180514", 160 .major = 1, 161 .minor = 0, 162 }; 163 164 static const struct of_device_id ili9341_of_match[] = { 165 { .compatible = "adafruit,yx240qv29" }, 166 { } 167 }; 168 MODULE_DEVICE_TABLE(of, ili9341_of_match); 169 170 static const struct spi_device_id ili9341_id[] = { 171 { "yx240qv29", 0 }, 172 { } 173 }; 174 MODULE_DEVICE_TABLE(spi, ili9341_id); 175 176 static int ili9341_probe(struct spi_device *spi) 177 { 178 struct device *dev = &spi->dev; 179 struct mipi_dbi_dev *dbidev; 180 struct drm_device *drm; 181 struct mipi_dbi *dbi; 182 struct gpio_desc *dc; 183 u32 rotation = 0; 184 int ret; 185 186 dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); 187 if (!dbidev) 188 return -ENOMEM; 189 190 dbi = &dbidev->dbi; 191 drm = &dbidev->drm; 192 ret = devm_drm_dev_init(dev, drm, &ili9341_driver); 193 if (ret) { 194 kfree(dbidev); 195 return ret; 196 } 197 198 drm_mode_config_init(drm); 199 200 dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 201 if (IS_ERR(dbi->reset)) { 202 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); 203 return PTR_ERR(dbi->reset); 204 } 205 206 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW); 207 if (IS_ERR(dc)) { 208 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n"); 209 return PTR_ERR(dc); 210 } 211 212 dbidev->backlight = devm_of_find_backlight(dev); 213 if (IS_ERR(dbidev->backlight)) 214 return PTR_ERR(dbidev->backlight); 215 216 device_property_read_u32(dev, "rotation", &rotation); 217 218 ret = mipi_dbi_spi_init(spi, dbi, dc); 219 if (ret) 220 return ret; 221 222 ret = mipi_dbi_dev_init(dbidev, &ili9341_pipe_funcs, &yx240qv29_mode, rotation); 223 if (ret) 224 return ret; 225 226 drm_mode_config_reset(drm); 227 228 ret = drm_dev_register(drm, 0); 229 if (ret) 230 return ret; 231 232 spi_set_drvdata(spi, drm); 233 234 drm_fbdev_generic_setup(drm, 0); 235 236 return 0; 237 } 238 239 static int ili9341_remove(struct spi_device *spi) 240 { 241 struct drm_device *drm = spi_get_drvdata(spi); 242 243 drm_dev_unplug(drm); 244 drm_atomic_helper_shutdown(drm); 245 246 return 0; 247 } 248 249 static void ili9341_shutdown(struct spi_device *spi) 250 { 251 drm_atomic_helper_shutdown(spi_get_drvdata(spi)); 252 } 253 254 static struct spi_driver ili9341_spi_driver = { 255 .driver = { 256 .name = "ili9341", 257 .of_match_table = ili9341_of_match, 258 }, 259 .id_table = ili9341_id, 260 .probe = ili9341_probe, 261 .remove = ili9341_remove, 262 .shutdown = ili9341_shutdown, 263 }; 264 module_spi_driver(ili9341_spi_driver); 265 266 MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver"); 267 MODULE_AUTHOR("David Lechner <david@lechnology.com>"); 268 MODULE_LICENSE("GPL"); 269