1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2017-2018, Bootlin 4 */ 5 6 #include <linux/backlight.h> 7 #include <linux/delay.h> 8 #include <linux/device.h> 9 #include <linux/err.h> 10 #include <linux/errno.h> 11 #include <linux/fb.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 15 #include <linux/gpio/consumer.h> 16 #include <linux/regulator/consumer.h> 17 18 #include <drm/drm_mipi_dsi.h> 19 #include <drm/drm_modes.h> 20 #include <drm/drm_panel.h> 21 22 #include <video/mipi_display.h> 23 24 struct ili9881c { 25 struct drm_panel panel; 26 struct mipi_dsi_device *dsi; 27 28 struct backlight_device *backlight; 29 struct regulator *power; 30 struct gpio_desc *reset; 31 }; 32 33 enum ili9881c_op { 34 ILI9881C_SWITCH_PAGE, 35 ILI9881C_COMMAND, 36 }; 37 38 struct ili9881c_instr { 39 enum ili9881c_op op; 40 41 union arg { 42 struct cmd { 43 u8 cmd; 44 u8 data; 45 } cmd; 46 u8 page; 47 } arg; 48 }; 49 50 #define ILI9881C_SWITCH_PAGE_INSTR(_page) \ 51 { \ 52 .op = ILI9881C_SWITCH_PAGE, \ 53 .arg = { \ 54 .page = (_page), \ 55 }, \ 56 } 57 58 #define ILI9881C_COMMAND_INSTR(_cmd, _data) \ 59 { \ 60 .op = ILI9881C_COMMAND, \ 61 .arg = { \ 62 .cmd = { \ 63 .cmd = (_cmd), \ 64 .data = (_data), \ 65 }, \ 66 }, \ 67 } 68 69 static const struct ili9881c_instr ili9881c_init[] = { 70 ILI9881C_SWITCH_PAGE_INSTR(3), 71 ILI9881C_COMMAND_INSTR(0x01, 0x00), 72 ILI9881C_COMMAND_INSTR(0x02, 0x00), 73 ILI9881C_COMMAND_INSTR(0x03, 0x73), 74 ILI9881C_COMMAND_INSTR(0x04, 0x03), 75 ILI9881C_COMMAND_INSTR(0x05, 0x00), 76 ILI9881C_COMMAND_INSTR(0x06, 0x06), 77 ILI9881C_COMMAND_INSTR(0x07, 0x06), 78 ILI9881C_COMMAND_INSTR(0x08, 0x00), 79 ILI9881C_COMMAND_INSTR(0x09, 0x18), 80 ILI9881C_COMMAND_INSTR(0x0a, 0x04), 81 ILI9881C_COMMAND_INSTR(0x0b, 0x00), 82 ILI9881C_COMMAND_INSTR(0x0c, 0x02), 83 ILI9881C_COMMAND_INSTR(0x0d, 0x03), 84 ILI9881C_COMMAND_INSTR(0x0e, 0x00), 85 ILI9881C_COMMAND_INSTR(0x0f, 0x25), 86 ILI9881C_COMMAND_INSTR(0x10, 0x25), 87 ILI9881C_COMMAND_INSTR(0x11, 0x00), 88 ILI9881C_COMMAND_INSTR(0x12, 0x00), 89 ILI9881C_COMMAND_INSTR(0x13, 0x00), 90 ILI9881C_COMMAND_INSTR(0x14, 0x00), 91 ILI9881C_COMMAND_INSTR(0x15, 0x00), 92 ILI9881C_COMMAND_INSTR(0x16, 0x0C), 93 ILI9881C_COMMAND_INSTR(0x17, 0x00), 94 ILI9881C_COMMAND_INSTR(0x18, 0x00), 95 ILI9881C_COMMAND_INSTR(0x19, 0x00), 96 ILI9881C_COMMAND_INSTR(0x1a, 0x00), 97 ILI9881C_COMMAND_INSTR(0x1b, 0x00), 98 ILI9881C_COMMAND_INSTR(0x1c, 0x00), 99 ILI9881C_COMMAND_INSTR(0x1d, 0x00), 100 ILI9881C_COMMAND_INSTR(0x1e, 0xC0), 101 ILI9881C_COMMAND_INSTR(0x1f, 0x80), 102 ILI9881C_COMMAND_INSTR(0x20, 0x04), 103 ILI9881C_COMMAND_INSTR(0x21, 0x01), 104 ILI9881C_COMMAND_INSTR(0x22, 0x00), 105 ILI9881C_COMMAND_INSTR(0x23, 0x00), 106 ILI9881C_COMMAND_INSTR(0x24, 0x00), 107 ILI9881C_COMMAND_INSTR(0x25, 0x00), 108 ILI9881C_COMMAND_INSTR(0x26, 0x00), 109 ILI9881C_COMMAND_INSTR(0x27, 0x00), 110 ILI9881C_COMMAND_INSTR(0x28, 0x33), 111 ILI9881C_COMMAND_INSTR(0x29, 0x03), 112 ILI9881C_COMMAND_INSTR(0x2a, 0x00), 113 ILI9881C_COMMAND_INSTR(0x2b, 0x00), 114 ILI9881C_COMMAND_INSTR(0x2c, 0x00), 115 ILI9881C_COMMAND_INSTR(0x2d, 0x00), 116 ILI9881C_COMMAND_INSTR(0x2e, 0x00), 117 ILI9881C_COMMAND_INSTR(0x2f, 0x00), 118 ILI9881C_COMMAND_INSTR(0x30, 0x00), 119 ILI9881C_COMMAND_INSTR(0x31, 0x00), 120 ILI9881C_COMMAND_INSTR(0x32, 0x00), 121 ILI9881C_COMMAND_INSTR(0x33, 0x00), 122 ILI9881C_COMMAND_INSTR(0x34, 0x04), 123 ILI9881C_COMMAND_INSTR(0x35, 0x00), 124 ILI9881C_COMMAND_INSTR(0x36, 0x00), 125 ILI9881C_COMMAND_INSTR(0x37, 0x00), 126 ILI9881C_COMMAND_INSTR(0x38, 0x3C), 127 ILI9881C_COMMAND_INSTR(0x39, 0x00), 128 ILI9881C_COMMAND_INSTR(0x3a, 0x00), 129 ILI9881C_COMMAND_INSTR(0x3b, 0x00), 130 ILI9881C_COMMAND_INSTR(0x3c, 0x00), 131 ILI9881C_COMMAND_INSTR(0x3d, 0x00), 132 ILI9881C_COMMAND_INSTR(0x3e, 0x00), 133 ILI9881C_COMMAND_INSTR(0x3f, 0x00), 134 ILI9881C_COMMAND_INSTR(0x40, 0x00), 135 ILI9881C_COMMAND_INSTR(0x41, 0x00), 136 ILI9881C_COMMAND_INSTR(0x42, 0x00), 137 ILI9881C_COMMAND_INSTR(0x43, 0x00), 138 ILI9881C_COMMAND_INSTR(0x44, 0x00), 139 ILI9881C_COMMAND_INSTR(0x50, 0x01), 140 ILI9881C_COMMAND_INSTR(0x51, 0x23), 141 ILI9881C_COMMAND_INSTR(0x52, 0x45), 142 ILI9881C_COMMAND_INSTR(0x53, 0x67), 143 ILI9881C_COMMAND_INSTR(0x54, 0x89), 144 ILI9881C_COMMAND_INSTR(0x55, 0xab), 145 ILI9881C_COMMAND_INSTR(0x56, 0x01), 146 ILI9881C_COMMAND_INSTR(0x57, 0x23), 147 ILI9881C_COMMAND_INSTR(0x58, 0x45), 148 ILI9881C_COMMAND_INSTR(0x59, 0x67), 149 ILI9881C_COMMAND_INSTR(0x5a, 0x89), 150 ILI9881C_COMMAND_INSTR(0x5b, 0xab), 151 ILI9881C_COMMAND_INSTR(0x5c, 0xcd), 152 ILI9881C_COMMAND_INSTR(0x5d, 0xef), 153 ILI9881C_COMMAND_INSTR(0x5e, 0x11), 154 ILI9881C_COMMAND_INSTR(0x5f, 0x02), 155 ILI9881C_COMMAND_INSTR(0x60, 0x02), 156 ILI9881C_COMMAND_INSTR(0x61, 0x02), 157 ILI9881C_COMMAND_INSTR(0x62, 0x02), 158 ILI9881C_COMMAND_INSTR(0x63, 0x02), 159 ILI9881C_COMMAND_INSTR(0x64, 0x02), 160 ILI9881C_COMMAND_INSTR(0x65, 0x02), 161 ILI9881C_COMMAND_INSTR(0x66, 0x02), 162 ILI9881C_COMMAND_INSTR(0x67, 0x02), 163 ILI9881C_COMMAND_INSTR(0x68, 0x02), 164 ILI9881C_COMMAND_INSTR(0x69, 0x02), 165 ILI9881C_COMMAND_INSTR(0x6a, 0x0C), 166 ILI9881C_COMMAND_INSTR(0x6b, 0x02), 167 ILI9881C_COMMAND_INSTR(0x6c, 0x0F), 168 ILI9881C_COMMAND_INSTR(0x6d, 0x0E), 169 ILI9881C_COMMAND_INSTR(0x6e, 0x0D), 170 ILI9881C_COMMAND_INSTR(0x6f, 0x06), 171 ILI9881C_COMMAND_INSTR(0x70, 0x07), 172 ILI9881C_COMMAND_INSTR(0x71, 0x02), 173 ILI9881C_COMMAND_INSTR(0x72, 0x02), 174 ILI9881C_COMMAND_INSTR(0x73, 0x02), 175 ILI9881C_COMMAND_INSTR(0x74, 0x02), 176 ILI9881C_COMMAND_INSTR(0x75, 0x02), 177 ILI9881C_COMMAND_INSTR(0x76, 0x02), 178 ILI9881C_COMMAND_INSTR(0x77, 0x02), 179 ILI9881C_COMMAND_INSTR(0x78, 0x02), 180 ILI9881C_COMMAND_INSTR(0x79, 0x02), 181 ILI9881C_COMMAND_INSTR(0x7a, 0x02), 182 ILI9881C_COMMAND_INSTR(0x7b, 0x02), 183 ILI9881C_COMMAND_INSTR(0x7c, 0x02), 184 ILI9881C_COMMAND_INSTR(0x7d, 0x02), 185 ILI9881C_COMMAND_INSTR(0x7e, 0x02), 186 ILI9881C_COMMAND_INSTR(0x7f, 0x02), 187 ILI9881C_COMMAND_INSTR(0x80, 0x0C), 188 ILI9881C_COMMAND_INSTR(0x81, 0x02), 189 ILI9881C_COMMAND_INSTR(0x82, 0x0F), 190 ILI9881C_COMMAND_INSTR(0x83, 0x0E), 191 ILI9881C_COMMAND_INSTR(0x84, 0x0D), 192 ILI9881C_COMMAND_INSTR(0x85, 0x06), 193 ILI9881C_COMMAND_INSTR(0x86, 0x07), 194 ILI9881C_COMMAND_INSTR(0x87, 0x02), 195 ILI9881C_COMMAND_INSTR(0x88, 0x02), 196 ILI9881C_COMMAND_INSTR(0x89, 0x02), 197 ILI9881C_COMMAND_INSTR(0x8A, 0x02), 198 ILI9881C_SWITCH_PAGE_INSTR(4), 199 ILI9881C_COMMAND_INSTR(0x6C, 0x15), 200 ILI9881C_COMMAND_INSTR(0x6E, 0x22), 201 ILI9881C_COMMAND_INSTR(0x6F, 0x33), 202 ILI9881C_COMMAND_INSTR(0x3A, 0xA4), 203 ILI9881C_COMMAND_INSTR(0x8D, 0x0D), 204 ILI9881C_COMMAND_INSTR(0x87, 0xBA), 205 ILI9881C_COMMAND_INSTR(0x26, 0x76), 206 ILI9881C_COMMAND_INSTR(0xB2, 0xD1), 207 ILI9881C_SWITCH_PAGE_INSTR(1), 208 ILI9881C_COMMAND_INSTR(0x22, 0x0A), 209 ILI9881C_COMMAND_INSTR(0x53, 0xDC), 210 ILI9881C_COMMAND_INSTR(0x55, 0xA7), 211 ILI9881C_COMMAND_INSTR(0x50, 0x78), 212 ILI9881C_COMMAND_INSTR(0x51, 0x78), 213 ILI9881C_COMMAND_INSTR(0x31, 0x02), 214 ILI9881C_COMMAND_INSTR(0x60, 0x14), 215 ILI9881C_COMMAND_INSTR(0xA0, 0x2A), 216 ILI9881C_COMMAND_INSTR(0xA1, 0x39), 217 ILI9881C_COMMAND_INSTR(0xA2, 0x46), 218 ILI9881C_COMMAND_INSTR(0xA3, 0x0e), 219 ILI9881C_COMMAND_INSTR(0xA4, 0x12), 220 ILI9881C_COMMAND_INSTR(0xA5, 0x25), 221 ILI9881C_COMMAND_INSTR(0xA6, 0x19), 222 ILI9881C_COMMAND_INSTR(0xA7, 0x1d), 223 ILI9881C_COMMAND_INSTR(0xA8, 0xa6), 224 ILI9881C_COMMAND_INSTR(0xA9, 0x1C), 225 ILI9881C_COMMAND_INSTR(0xAA, 0x29), 226 ILI9881C_COMMAND_INSTR(0xAB, 0x85), 227 ILI9881C_COMMAND_INSTR(0xAC, 0x1C), 228 ILI9881C_COMMAND_INSTR(0xAD, 0x1B), 229 ILI9881C_COMMAND_INSTR(0xAE, 0x51), 230 ILI9881C_COMMAND_INSTR(0xAF, 0x22), 231 ILI9881C_COMMAND_INSTR(0xB0, 0x2d), 232 ILI9881C_COMMAND_INSTR(0xB1, 0x4f), 233 ILI9881C_COMMAND_INSTR(0xB2, 0x59), 234 ILI9881C_COMMAND_INSTR(0xB3, 0x3F), 235 ILI9881C_COMMAND_INSTR(0xC0, 0x2A), 236 ILI9881C_COMMAND_INSTR(0xC1, 0x3a), 237 ILI9881C_COMMAND_INSTR(0xC2, 0x45), 238 ILI9881C_COMMAND_INSTR(0xC3, 0x0e), 239 ILI9881C_COMMAND_INSTR(0xC4, 0x11), 240 ILI9881C_COMMAND_INSTR(0xC5, 0x24), 241 ILI9881C_COMMAND_INSTR(0xC6, 0x1a), 242 ILI9881C_COMMAND_INSTR(0xC7, 0x1c), 243 ILI9881C_COMMAND_INSTR(0xC8, 0xaa), 244 ILI9881C_COMMAND_INSTR(0xC9, 0x1C), 245 ILI9881C_COMMAND_INSTR(0xCA, 0x29), 246 ILI9881C_COMMAND_INSTR(0xCB, 0x96), 247 ILI9881C_COMMAND_INSTR(0xCC, 0x1C), 248 ILI9881C_COMMAND_INSTR(0xCD, 0x1B), 249 ILI9881C_COMMAND_INSTR(0xCE, 0x51), 250 ILI9881C_COMMAND_INSTR(0xCF, 0x22), 251 ILI9881C_COMMAND_INSTR(0xD0, 0x2b), 252 ILI9881C_COMMAND_INSTR(0xD1, 0x4b), 253 ILI9881C_COMMAND_INSTR(0xD2, 0x59), 254 ILI9881C_COMMAND_INSTR(0xD3, 0x3F), 255 }; 256 257 static inline struct ili9881c *panel_to_ili9881c(struct drm_panel *panel) 258 { 259 return container_of(panel, struct ili9881c, panel); 260 } 261 262 /* 263 * The panel seems to accept some private DCS commands that map 264 * directly to registers. 265 * 266 * It is organised by page, with each page having its own set of 267 * registers, and the first page looks like it's holding the standard 268 * DCS commands. 269 * 270 * So before any attempt at sending a command or data, we have to be 271 * sure if we're in the right page or not. 272 */ 273 static int ili9881c_switch_page(struct ili9881c *ctx, u8 page) 274 { 275 u8 buf[4] = { 0xff, 0x98, 0x81, page }; 276 int ret; 277 278 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf)); 279 if (ret < 0) 280 return ret; 281 282 return 0; 283 } 284 285 static int ili9881c_send_cmd_data(struct ili9881c *ctx, u8 cmd, u8 data) 286 { 287 u8 buf[2] = { cmd, data }; 288 int ret; 289 290 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf)); 291 if (ret < 0) 292 return ret; 293 294 return 0; 295 } 296 297 static int ili9881c_prepare(struct drm_panel *panel) 298 { 299 struct ili9881c *ctx = panel_to_ili9881c(panel); 300 unsigned int i; 301 int ret; 302 303 /* Power the panel */ 304 ret = regulator_enable(ctx->power); 305 if (ret) 306 return ret; 307 msleep(5); 308 309 /* And reset it */ 310 gpiod_set_value(ctx->reset, 1); 311 msleep(20); 312 313 gpiod_set_value(ctx->reset, 0); 314 msleep(20); 315 316 for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) { 317 const struct ili9881c_instr *instr = &ili9881c_init[i]; 318 319 if (instr->op == ILI9881C_SWITCH_PAGE) 320 ret = ili9881c_switch_page(ctx, instr->arg.page); 321 else if (instr->op == ILI9881C_COMMAND) 322 ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd, 323 instr->arg.cmd.data); 324 325 if (ret) 326 return ret; 327 } 328 329 ret = ili9881c_switch_page(ctx, 0); 330 if (ret) 331 return ret; 332 333 ret = mipi_dsi_dcs_set_tear_on(ctx->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK); 334 if (ret) 335 return ret; 336 337 mipi_dsi_dcs_exit_sleep_mode(ctx->dsi); 338 if (ret) 339 return ret; 340 341 return 0; 342 } 343 344 static int ili9881c_enable(struct drm_panel *panel) 345 { 346 struct ili9881c *ctx = panel_to_ili9881c(panel); 347 348 msleep(120); 349 350 mipi_dsi_dcs_set_display_on(ctx->dsi); 351 backlight_enable(ctx->backlight); 352 353 return 0; 354 } 355 356 static int ili9881c_disable(struct drm_panel *panel) 357 { 358 struct ili9881c *ctx = panel_to_ili9881c(panel); 359 360 backlight_disable(ctx->backlight); 361 return mipi_dsi_dcs_set_display_off(ctx->dsi); 362 } 363 364 static int ili9881c_unprepare(struct drm_panel *panel) 365 { 366 struct ili9881c *ctx = panel_to_ili9881c(panel); 367 368 mipi_dsi_dcs_enter_sleep_mode(ctx->dsi); 369 regulator_disable(ctx->power); 370 gpiod_set_value(ctx->reset, 1); 371 372 return 0; 373 } 374 375 static const struct drm_display_mode bananapi_default_mode = { 376 .clock = 62000, 377 .vrefresh = 60, 378 379 .hdisplay = 720, 380 .hsync_start = 720 + 10, 381 .hsync_end = 720 + 10 + 20, 382 .htotal = 720 + 10 + 20 + 30, 383 384 .vdisplay = 1280, 385 .vsync_start = 1280 + 10, 386 .vsync_end = 1280 + 10 + 10, 387 .vtotal = 1280 + 10 + 10 + 20, 388 }; 389 390 static int ili9881c_get_modes(struct drm_panel *panel) 391 { 392 struct drm_connector *connector = panel->connector; 393 struct ili9881c *ctx = panel_to_ili9881c(panel); 394 struct drm_display_mode *mode; 395 396 mode = drm_mode_duplicate(panel->drm, &bananapi_default_mode); 397 if (!mode) { 398 dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n", 399 bananapi_default_mode.hdisplay, 400 bananapi_default_mode.vdisplay, 401 bananapi_default_mode.vrefresh); 402 return -ENOMEM; 403 } 404 405 drm_mode_set_name(mode); 406 407 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 408 drm_mode_probed_add(connector, mode); 409 410 panel->connector->display_info.width_mm = 62; 411 panel->connector->display_info.height_mm = 110; 412 413 return 1; 414 } 415 416 static const struct drm_panel_funcs ili9881c_funcs = { 417 .prepare = ili9881c_prepare, 418 .unprepare = ili9881c_unprepare, 419 .enable = ili9881c_enable, 420 .disable = ili9881c_disable, 421 .get_modes = ili9881c_get_modes, 422 }; 423 424 static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi) 425 { 426 struct device_node *np; 427 struct ili9881c *ctx; 428 int ret; 429 430 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL); 431 if (!ctx) 432 return -ENOMEM; 433 mipi_dsi_set_drvdata(dsi, ctx); 434 ctx->dsi = dsi; 435 436 drm_panel_init(&ctx->panel); 437 ctx->panel.dev = &dsi->dev; 438 ctx->panel.funcs = &ili9881c_funcs; 439 440 ctx->power = devm_regulator_get(&dsi->dev, "power"); 441 if (IS_ERR(ctx->power)) { 442 dev_err(&dsi->dev, "Couldn't get our power regulator\n"); 443 return PTR_ERR(ctx->power); 444 } 445 446 ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW); 447 if (IS_ERR(ctx->reset)) { 448 dev_err(&dsi->dev, "Couldn't get our reset GPIO\n"); 449 return PTR_ERR(ctx->reset); 450 } 451 452 np = of_parse_phandle(dsi->dev.of_node, "backlight", 0); 453 if (np) { 454 ctx->backlight = of_find_backlight_by_node(np); 455 of_node_put(np); 456 457 if (!ctx->backlight) 458 return -EPROBE_DEFER; 459 } 460 461 ret = drm_panel_add(&ctx->panel); 462 if (ret < 0) 463 return ret; 464 465 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE; 466 dsi->format = MIPI_DSI_FMT_RGB888; 467 dsi->lanes = 4; 468 469 return mipi_dsi_attach(dsi); 470 } 471 472 static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi) 473 { 474 struct ili9881c *ctx = mipi_dsi_get_drvdata(dsi); 475 476 mipi_dsi_detach(dsi); 477 drm_panel_remove(&ctx->panel); 478 479 if (ctx->backlight) 480 put_device(&ctx->backlight->dev); 481 482 return 0; 483 } 484 485 static const struct of_device_id ili9881c_of_match[] = { 486 { .compatible = "bananapi,lhr050h41" }, 487 { } 488 }; 489 MODULE_DEVICE_TABLE(of, ili9881c_of_match); 490 491 static struct mipi_dsi_driver ili9881c_dsi_driver = { 492 .probe = ili9881c_dsi_probe, 493 .remove = ili9881c_dsi_remove, 494 .driver = { 495 .name = "ili9881c-dsi", 496 .of_match_table = ili9881c_of_match, 497 }, 498 }; 499 module_mipi_dsi_driver(ili9881c_dsi_driver); 500 501 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 502 MODULE_DESCRIPTION("Ilitek ILI9881C Controller Driver"); 503 MODULE_LICENSE("GPL v2"); 504