drivers/staging/fbtft/fbtft-core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2013 Noralf Tronnes
   4  *
   5  * This driver is inspired by:
   6  *   st7735fb.c, Copyright (C) 2011, Matt Porter
   7  *   broadsheetfb.c, Copyright (C) 2008, Jaya Kumar
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/string.h>
  14 #include <linux/mm.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/slab.h>
  17 #include <linux/init.h>
  18 #include <linux/fb.h>
  19 #include <linux/gpio/consumer.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/delay.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/backlight.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/property.h>
  26 #include <linux/spinlock.h>
  27
  28 #include <video/mipi_display.h>
  29
  30 #include "fbtft.h"
  31 #include "internal.h"
  32
  33 static unsigned long debug;
  34 module_param(debug, ulong, 0000);
  35 MODULE_PARM_DESC(debug, "override device debug level");
  36
  37 int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc)
  38 {
  39         int ret;
  40
  41         gpiod_set_value(par->gpio.dc, dc);
  42
  43         ret = par->fbtftops.write(par, buf, len);
  44         if (ret < 0)
  45                 dev_err(par->info->device,
  46                         "write() failed and returned %d\n", ret);
  47         return ret;
  48 }
  49 EXPORT_SYMBOL(fbtft_write_buf_dc);
  50
  51 void fbtft_dbg_hex(const struct device *dev, int groupsize,
  52                    const void *buf, size_t len, const char *fmt, ...)
  53 {
  54         va_list args;
  55         static char textbuf[512];
  56         char *text = textbuf;
  57         size_t text_len;
  58
  59         va_start(args, fmt);
  60         text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
  61         va_end(args);
  62
  63         hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len,
  64                            512 - text_len, false);
  65
  66         if (len > 32)
  67                 dev_info(dev, "%s ...\n", text);
  68         else
  69                 dev_info(dev, "%s\n", text);
  70 }
  71 EXPORT_SYMBOL(fbtft_dbg_hex);
  72
  73 static int fbtft_request_one_gpio(struct fbtft_par *par,
  74                                   const char *name, int index,
  75                                   struct gpio_desc **gpiop)
  76 {
  77         struct device *dev = par->info->device;
  78
  79         *gpiop = devm_gpiod_get_index_optional(dev, name, index,
  80                                                GPIOD_OUT_LOW);
  81         if (IS_ERR(*gpiop))
  82                 return dev_err_probe(dev, PTR_ERR(*gpiop), "Failed to request %s GPIO\n", name);
  83
  84         fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
  85                       __func__, name);
  86
  87         return 0;
  88 }
  89
  90 static int fbtft_request_gpios(struct fbtft_par *par)
  91 {
  92         int i;
  93         int ret;
  94
  95         ret = fbtft_request_one_gpio(par, "reset", 0, &par->gpio.reset);
  96         if (ret)
  97                 return ret;
  98         ret = fbtft_request_one_gpio(par, "dc", 0, &par->gpio.dc);
  99         if (ret)
 100                 return ret;
 101         ret = fbtft_request_one_gpio(par, "rd", 0, &par->gpio.rd);
 102         if (ret)
 103                 return ret;
 104         ret = fbtft_request_one_gpio(par, "wr", 0, &par->gpio.wr);
 105         if (ret)
 106                 return ret;
 107         ret = fbtft_request_one_gpio(par, "cs", 0, &par->gpio.cs);
 108         if (ret)
 109                 return ret;
 110         ret = fbtft_request_one_gpio(par, "latch", 0, &par->gpio.latch);
 111         if (ret)
 112                 return ret;
 113         for (i = 0; i < 16; i++) {
 114                 ret = fbtft_request_one_gpio(par, "db", i,
 115                                              &par->gpio.db[i]);
 116                 if (ret)
 117                         return ret;
 118                 ret = fbtft_request_one_gpio(par, "led", i,
 119                                              &par->gpio.led[i]);
 120                 if (ret)
 121                         return ret;
 122                 ret = fbtft_request_one_gpio(par, "aux", i,
 123                                              &par->gpio.aux[i]);
 124                 if (ret)
 125                         return ret;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int fbtft_backlight_update_status(struct backlight_device *bd)
 132 {
 133         struct fbtft_par *par = bl_get_data(bd);
 134         bool polarity = par->polarity;
 135
 136         fbtft_par_dbg(DEBUG_BACKLIGHT, par,
 137                       "%s: polarity=%d, power=%d, fb_blank=%d\n",
 138                       __func__, polarity, bd->props.power, bd->props.fb_blank);
 139
 140         if (!backlight_is_blank(bd))
 141                 gpiod_set_value(par->gpio.led[0], polarity);
 142         else
 143                 gpiod_set_value(par->gpio.led[0], !polarity);
 144
 145         return 0;
 146 }
 147
 148 static int fbtft_backlight_get_brightness(struct backlight_device *bd)
 149 {
 150         return bd->props.brightness;
 151 }
 152
 153 void fbtft_unregister_backlight(struct fbtft_par *par)
 154 {
 155         if (par->info->bl_dev) {
 156                 par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
 157                 backlight_update_status(par->info->bl_dev);
 158                 backlight_device_unregister(par->info->bl_dev);
 159                 par->info->bl_dev = NULL;
 160         }
 161 }
 162 EXPORT_SYMBOL(fbtft_unregister_backlight);
 163
 164 static const struct backlight_ops fbtft_bl_ops = {
 165         .get_brightness = fbtft_backlight_get_brightness,
 166         .update_status  = fbtft_backlight_update_status,
 167 };
 168
 169 void fbtft_register_backlight(struct fbtft_par *par)
 170 {
 171         struct backlight_device *bd;
 172         struct backlight_properties bl_props = { 0, };
 173
 174         if (!par->gpio.led[0]) {
 175                 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
 176                               "%s(): led pin not set, exiting.\n", __func__);
 177                 return;
 178         }
 179
 180         bl_props.type = BACKLIGHT_RAW;
 181         /* Assume backlight is off, get polarity from current state of pin */
 182         bl_props.power = FB_BLANK_POWERDOWN;
 183         if (!gpiod_get_value(par->gpio.led[0]))
 184                 par->polarity = true;
 185
 186         bd = backlight_device_register(dev_driver_string(par->info->device),
 187                                        par->info->device, par,
 188                                        &fbtft_bl_ops, &bl_props);
 189         if (IS_ERR(bd)) {
 190                 dev_err(par->info->device,
 191                         "cannot register backlight device (%ld)\n",
 192                         PTR_ERR(bd));
 193                 return;
 194         }
 195         par->info->bl_dev = bd;
 196
 197         if (!par->fbtftops.unregister_backlight)
 198                 par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
 199 }
 200 EXPORT_SYMBOL(fbtft_register_backlight);
 201
 202 static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
 203                                int ye)
 204 {
 205         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
 206                   (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
 207
 208         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
 209                   (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
 210
 211         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 212 }
 213
 214 static void fbtft_reset(struct fbtft_par *par)
 215 {
 216         if (!par->gpio.reset)
 217                 return;
 218
 219         fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
 220
 221         gpiod_set_value_cansleep(par->gpio.reset, 1);
 222         usleep_range(20, 40);
 223         gpiod_set_value_cansleep(par->gpio.reset, 0);
 224         msleep(120);
 225
 226         gpiod_set_value_cansleep(par->gpio.cs, 1);  /* Activate chip */
 227 }
 228
 229 static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
 230                                  unsigned int end_line)
 231 {
 232         size_t offset, len;
 233         ktime_t ts_start, ts_end;
 234         long fps, throughput;
 235         bool timeit = false;
 236         int ret = 0;
 237
 238         if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE |
 239                         DEBUG_TIME_EACH_UPDATE))) {
 240                 if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
 241                     ((par->debug & DEBUG_TIME_FIRST_UPDATE) &&
 242                     !par->first_update_done)) {
 243                         ts_start = ktime_get();
 244                         timeit = true;
 245                 }
 246         }
 247
 248         /* Sanity checks */
 249         if (start_line > end_line) {
 250                 dev_warn(par->info->device,
 251                          "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
 252                          __func__, start_line, end_line);
 253                 start_line = 0;
 254                 end_line = par->info->var.yres - 1;
 255         }
 256         if (start_line > par->info->var.yres - 1 ||
 257             end_line > par->info->var.yres - 1) {
 258                 dev_warn(par->info->device,
 259                          "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
 260                          __func__, start_line,
 261                          end_line, par->info->var.yres - 1);
 262                 start_line = 0;
 263                 end_line = par->info->var.yres - 1;
 264         }
 265
 266         fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
 267                       __func__, start_line, end_line);
 268
 269         if (par->fbtftops.set_addr_win)
 270                 par->fbtftops.set_addr_win(par, 0, start_line,
 271                                 par->info->var.xres - 1, end_line);
 272
 273         offset = start_line * par->info->fix.line_length;
 274         len = (end_line - start_line + 1) * par->info->fix.line_length;
 275         ret = par->fbtftops.write_vmem(par, offset, len);
 276         if (ret < 0)
 277                 dev_err(par->info->device,
 278                         "%s: write_vmem failed to update display buffer\n",
 279                         __func__);
 280
 281         if (unlikely(timeit)) {
 282                 ts_end = ktime_get();
 283                 if (!ktime_to_ns(par->update_time))
 284                         par->update_time = ts_start;
 285
 286                 fps = ktime_us_delta(ts_start, par->update_time);
 287                 par->update_time = ts_start;
 288                 fps = fps ? 1000000 / fps : 0;
 289
 290                 throughput = ktime_us_delta(ts_end, ts_start);
 291                 throughput = throughput ? (len * 1000) / throughput : 0;
 292                 throughput = throughput * 1000 / 1024;
 293
 294                 dev_info(par->info->device,
 295                          "Display update: %ld kB/s, fps=%ld\n",
 296                          throughput, fps);
 297                 par->first_update_done = true;
 298         }
 299 }
 300
 301 static void fbtft_mkdirty(struct fb_info *info, int y, int height)
 302 {
 303         struct fbtft_par *par = info->par;
 304         struct fb_deferred_io *fbdefio = info->fbdefio;
 305
 306         /* special case, needed ? */
 307         if (y == -1) {
 308                 y = 0;
 309                 height = info->var.yres;
 310         }
 311
 312         /* Mark display lines/area as dirty */
 313         spin_lock(&par->dirty_lock);
 314         if (y < par->dirty_lines_start)
 315                 par->dirty_lines_start = y;
 316         if (y + height - 1 > par->dirty_lines_end)
 317                 par->dirty_lines_end = y + height - 1;
 318         spin_unlock(&par->dirty_lock);
 319
 320         /* Schedule deferred_io to update display (no-op if already on queue)*/
 321         schedule_delayed_work(&info->deferred_work, fbdefio->delay);
 322 }
 323
 324 static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagereflist)
 325 {
 326         struct fbtft_par *par = info->par;
 327         unsigned int dirty_lines_start, dirty_lines_end;
 328         struct fb_deferred_io_pageref *pageref;
 329         unsigned int y_low = 0, y_high = 0;
 330         int count = 0;
 331
 332         spin_lock(&par->dirty_lock);
 333         dirty_lines_start = par->dirty_lines_start;
 334         dirty_lines_end = par->dirty_lines_end;
 335         /* set display line markers as clean */
 336         par->dirty_lines_start = par->info->var.yres - 1;
 337         par->dirty_lines_end = 0;
 338         spin_unlock(&par->dirty_lock);
 339
 340         /* Mark display lines as dirty */
 341         list_for_each_entry(pageref, pagereflist, list) {
 342                 count++;
 343                 y_low = pageref->offset / info->fix.line_length;
 344                 y_high = (pageref->offset + PAGE_SIZE - 1) / info->fix.line_length;
 345                 dev_dbg(info->device,
 346                         "page->index=%lu y_low=%d y_high=%d\n",
 347                         pageref->page->index, y_low, y_high);
 348                 if (y_high > info->var.yres - 1)
 349                         y_high = info->var.yres - 1;
 350                 if (y_low < dirty_lines_start)
 351                         dirty_lines_start = y_low;
 352                 if (y_high > dirty_lines_end)
 353                         dirty_lines_end = y_high;
 354         }
 355
 356         par->fbtftops.update_display(info->par,
 357                                         dirty_lines_start, dirty_lines_end);
 358 }
 359
 360 /* from pxafb.c */
 361 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
 362 {
 363         chan &= 0xffff;
 364         chan >>= 16 - bf->length;
 365         return chan << bf->offset;
 366 }
 367
 368 static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
 369                               unsigned int green, unsigned int blue,
 370                               unsigned int transp, struct fb_info *info)
 371 {
 372         unsigned int val;
 373         int ret = 1;
 374
 375         dev_dbg(info->dev,
 376                 "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
 377                 __func__, regno, red, green, blue, transp);
 378
 379         switch (info->fix.visual) {
 380         case FB_VISUAL_TRUECOLOR:
 381                 if (regno < 16) {
 382                         u32 *pal = info->pseudo_palette;
 383
 384                         val  = chan_to_field(red,   &info->var.red);
 385                         val |= chan_to_field(green, &info->var.green);
 386                         val |= chan_to_field(blue,  &info->var.blue);
 387
 388                         pal[regno] = val;
 389                         ret = 0;
 390                 }
 391                 break;
 392         }
 393         return ret;
 394 }
 395
 396 static int fbtft_fb_blank(int blank, struct fb_info *info)
 397 {
 398         struct fbtft_par *par = info->par;
 399         int ret = -EINVAL;
 400
 401         dev_dbg(info->dev, "%s(blank=%d)\n",
 402                 __func__, blank);
 403
 404         if (!par->fbtftops.blank)
 405                 return ret;
 406
 407         switch (blank) {
 408         case FB_BLANK_POWERDOWN:
 409         case FB_BLANK_VSYNC_SUSPEND:
 410         case FB_BLANK_HSYNC_SUSPEND:
 411         case FB_BLANK_NORMAL:
 412                 ret = par->fbtftops.blank(par, true);
 413                 break;
 414         case FB_BLANK_UNBLANK:
 415                 ret = par->fbtftops.blank(par, false);
 416                 break;
 417         }
 418         return ret;
 419 }
 420
 421 static void fbtft_ops_damage_range(struct fb_info *info, off_t off, size_t len)
 422 {
 423         struct fbtft_par *par = info->par;
 424
 425         /* TODO: only mark changed area update all for now */
 426         par->fbtftops.mkdirty(info, -1, 0);
 427 }
 428
 429 static void fbtft_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)
 430 {
 431         struct fbtft_par *par = info->par;
 432
 433         par->fbtftops.mkdirty(info, y, height);
 434 }
 435
 436 FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(fbtft_ops,
 437                                    fbtft_ops_damage_range,
 438                                    fbtft_ops_damage_area)
 439
 440 static const struct fb_ops fbtft_ops = {
 441         .owner        = THIS_MODULE,
 442         FB_DEFAULT_DEFERRED_OPS(fbtft_ops),
 443         .fb_setcolreg = fbtft_fb_setcolreg,
 444         .fb_blank     = fbtft_fb_blank,
 445 };
 446
 447 static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
 448 {
 449         if (src->write)
 450                 dst->write = src->write;
 451         if (src->read)
 452                 dst->read = src->read;
 453         if (src->write_vmem)
 454                 dst->write_vmem = src->write_vmem;
 455         if (src->write_register)
 456                 dst->write_register = src->write_register;
 457         if (src->set_addr_win)
 458                 dst->set_addr_win = src->set_addr_win;
 459         if (src->reset)
 460                 dst->reset = src->reset;
 461         if (src->mkdirty)
 462                 dst->mkdirty = src->mkdirty;
 463         if (src->update_display)
 464                 dst->update_display = src->update_display;
 465         if (src->init_display)
 466                 dst->init_display = src->init_display;
 467         if (src->blank)
 468                 dst->blank = src->blank;
 469         if (src->request_gpios_match)
 470                 dst->request_gpios_match = src->request_gpios_match;
 471         if (src->request_gpios)
 472                 dst->request_gpios = src->request_gpios;
 473         if (src->verify_gpios)
 474                 dst->verify_gpios = src->verify_gpios;
 475         if (src->register_backlight)
 476                 dst->register_backlight = src->register_backlight;
 477         if (src->unregister_backlight)
 478                 dst->unregister_backlight = src->unregister_backlight;
 479         if (src->set_var)
 480                 dst->set_var = src->set_var;
 481         if (src->set_gamma)
 482                 dst->set_gamma = src->set_gamma;
 483 }
 484
 485 /**
 486  * fbtft_framebuffer_alloc - creates a new frame buffer info structure
 487  *
 488  * @display: pointer to structure describing the display
 489  * @dev: pointer to the device for this fb, this can be NULL
 490  * @pdata: platform data for the display in use
 491  *
 492  * Creates a new frame buffer info structure.
 493  *
 494  * Also creates and populates the following structures:
 495  *   info->fbdefio
 496  *   info->pseudo_palette
 497  *   par->fbtftops
 498  *   par->txbuf
 499  *
 500  * Returns the new structure, or NULL if an error occurred.
 501  *
 502  */
 503 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 504                                         struct device *dev,
 505                                         struct fbtft_platform_data *pdata)
 506 {
 507         struct fb_info *info;
 508         struct fbtft_par *par;
 509         struct fb_deferred_io *fbdefio = NULL;
 510         u8 *vmem = NULL;
 511         void *txbuf = NULL;
 512         void *buf = NULL;
 513         unsigned int width;
 514         unsigned int height;
 515         int txbuflen = display->txbuflen;
 516         unsigned int bpp = display->bpp;
 517         unsigned int fps = display->fps;
 518         int vmem_size;
 519         const s16 *init_sequence = display->init_sequence;
 520         char *gamma = display->gamma;
 521         u32 *gamma_curves = NULL;
 522
 523         /* sanity check */
 524         if (display->gamma_num * display->gamma_len >
 525                         FBTFT_GAMMA_MAX_VALUES_TOTAL) {
 526                 dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
 527                         FBTFT_GAMMA_MAX_VALUES_TOTAL);
 528                 return NULL;
 529         }
 530
 531         /* defaults */
 532         if (!fps)
 533                 fps = 20;
 534         if (!bpp)
 535                 bpp = 16;
 536
 537         if (!pdata) {
 538                 dev_err(dev, "platform data is missing\n");
 539                 return NULL;
 540         }
 541
 542         /* override driver values? */
 543         if (pdata->fps)
 544                 fps = pdata->fps;
 545         if (pdata->txbuflen)
 546                 txbuflen = pdata->txbuflen;
 547         if (pdata->display.init_sequence)
 548                 init_sequence = pdata->display.init_sequence;
 549         if (pdata->gamma)
 550                 gamma = pdata->gamma;
 551         if (pdata->display.debug)
 552                 display->debug = pdata->display.debug;
 553         if (pdata->display.backlight)
 554                 display->backlight = pdata->display.backlight;
 555         if (pdata->display.width)
 556                 display->width = pdata->display.width;
 557         if (pdata->display.height)
 558                 display->height = pdata->display.height;
 559         if (pdata->display.buswidth)
 560                 display->buswidth = pdata->display.buswidth;
 561         if (pdata->display.regwidth)
 562                 display->regwidth = pdata->display.regwidth;
 563
 564         display->debug |= debug;
 565         fbtft_expand_debug_value(&display->debug);
 566
 567         switch (pdata->rotate) {
 568         case 90:
 569         case 270:
 570                 width =  display->height;
 571                 height = display->width;
 572                 break;
 573         default:
 574                 width =  display->width;
 575                 height = display->height;
 576         }
 577
 578         vmem_size = display->width * display->height * bpp / 8;
 579         vmem = vzalloc(vmem_size);
 580         if (!vmem)
 581                 goto alloc_fail;
 582
 583         fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
 584         if (!fbdefio)
 585                 goto alloc_fail;
 586
 587         buf = devm_kzalloc(dev, 128, GFP_KERNEL);
 588         if (!buf)
 589                 goto alloc_fail;
 590
 591         if (display->gamma_num && display->gamma_len) {
 592                 gamma_curves = devm_kcalloc(dev,
 593                                             display->gamma_num *
 594                                             display->gamma_len,
 595                                             sizeof(gamma_curves[0]),
 596                                             GFP_KERNEL);
 597                 if (!gamma_curves)
 598                         goto alloc_fail;
 599         }
 600
 601         info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
 602         if (!info)
 603                 goto alloc_fail;
 604
 605         info->screen_buffer = vmem;
 606         info->fbops = &fbtft_ops;
 607         info->fbdefio = fbdefio;
 608
 609         fbdefio->delay =            HZ / fps;
 610         fbdefio->sort_pagereflist = true;
 611         fbdefio->deferred_io =      fbtft_deferred_io;
 612
 613         snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
 614         info->fix.type =           FB_TYPE_PACKED_PIXELS;
 615         info->fix.visual =         FB_VISUAL_TRUECOLOR;
 616         info->fix.xpanstep =       0;
 617         info->fix.ypanstep =       0;
 618         info->fix.ywrapstep =      0;
 619         info->fix.line_length =    width * bpp / 8;
 620         info->fix.accel =          FB_ACCEL_NONE;
 621         info->fix.smem_len =       vmem_size;
 622         fb_deferred_io_init(info);
 623
 624         info->var.rotate =         pdata->rotate;
 625         info->var.xres =           width;
 626         info->var.yres =           height;
 627         info->var.xres_virtual =   info->var.xres;
 628         info->var.yres_virtual =   info->var.yres;
 629         info->var.bits_per_pixel = bpp;
 630         info->var.nonstd =         1;
 631
 632         /* RGB565 */
 633         info->var.red.offset =     11;
 634         info->var.red.length =     5;
 635         info->var.green.offset =   5;
 636         info->var.green.length =   6;
 637         info->var.blue.offset =    0;
 638         info->var.blue.length =    5;
 639         info->var.transp.offset =  0;
 640         info->var.transp.length =  0;
 641
 642         info->flags =              FBINFO_VIRTFB;
 643
 644         par = info->par;
 645         par->info = info;
 646         par->pdata = pdata;
 647         par->debug = display->debug;
 648         par->buf = buf;
 649         spin_lock_init(&par->dirty_lock);
 650         par->bgr = pdata->bgr;
 651         par->startbyte = pdata->startbyte;
 652         par->init_sequence = init_sequence;
 653         par->gamma.curves = gamma_curves;
 654         par->gamma.num_curves = display->gamma_num;
 655         par->gamma.num_values = display->gamma_len;
 656         mutex_init(&par->gamma.lock);
 657         info->pseudo_palette = par->pseudo_palette;
 658
 659         if (par->gamma.curves && gamma) {
 660                 if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
 661                                           strlen(gamma)))
 662                         goto release_framebuf;
 663         }
 664
 665         /* Transmit buffer */
 666         if (txbuflen == -1)
 667                 txbuflen = vmem_size + 2; /* add in case startbyte is used */
 668         if (txbuflen >= vmem_size + 2)
 669                 txbuflen = 0;
 670
 671 #ifdef __LITTLE_ENDIAN
 672         if ((!txbuflen) && (bpp > 8))
 673                 txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
 674 #endif
 675
 676         if (txbuflen > 0) {
 677                 txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
 678                 if (!txbuf)
 679                         goto release_framebuf;
 680                 par->txbuf.buf = txbuf;
 681                 par->txbuf.len = txbuflen;
 682         }
 683
 684         /* default fbtft operations */
 685         par->fbtftops.write = fbtft_write_spi;
 686         par->fbtftops.read = fbtft_read_spi;
 687         par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
 688         par->fbtftops.write_register = fbtft_write_reg8_bus8;
 689         par->fbtftops.set_addr_win = fbtft_set_addr_win;
 690         par->fbtftops.reset = fbtft_reset;
 691         par->fbtftops.mkdirty = fbtft_mkdirty;
 692         par->fbtftops.update_display = fbtft_update_display;
 693         if (display->backlight)
 694                 par->fbtftops.register_backlight = fbtft_register_backlight;
 695
 696         /* use driver provided functions */
 697         fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
 698
 699         return info;
 700
 701 release_framebuf:
 702         framebuffer_release(info);
 703
 704 alloc_fail:
 705         vfree(vmem);
 706
 707         return NULL;
 708 }
 709 EXPORT_SYMBOL(fbtft_framebuffer_alloc);
 710
 711 /**
 712  * fbtft_framebuffer_release - frees up all memory used by the framebuffer
 713  *
 714  * @info: frame buffer info structure
 715  *
 716  */
 717 void fbtft_framebuffer_release(struct fb_info *info)
 718 {
 719         fb_deferred_io_cleanup(info);
 720         vfree(info->screen_buffer);
 721         framebuffer_release(info);
 722 }
 723 EXPORT_SYMBOL(fbtft_framebuffer_release);
 724
 725 /**
 726  *      fbtft_register_framebuffer - registers a tft frame buffer device
 727  *      @fb_info: frame buffer info structure
 728  *
 729  *  Sets SPI driverdata if needed
 730  *  Requests needed gpios.
 731  *  Initializes display
 732  *  Updates display.
 733  *      Registers a frame buffer device @fb_info.
 734  *
 735  *      Returns negative errno on error, or zero for success.
 736  *
 737  */
 738 int fbtft_register_framebuffer(struct fb_info *fb_info)
 739 {
 740         int ret;
 741         char text1[50] = "";
 742         char text2[50] = "";
 743         struct fbtft_par *par = fb_info->par;
 744         struct spi_device *spi = par->spi;
 745
 746         /* sanity checks */
 747         if (!par->fbtftops.init_display) {
 748                 dev_err(fb_info->device, "missing fbtftops.init_display()\n");
 749                 return -EINVAL;
 750         }
 751
 752         if (spi)
 753                 spi_set_drvdata(spi, fb_info);
 754         if (par->pdev)
 755                 platform_set_drvdata(par->pdev, fb_info);
 756
 757         ret = par->fbtftops.request_gpios(par);
 758         if (ret < 0)
 759                 goto reg_fail;
 760
 761         if (par->fbtftops.verify_gpios) {
 762                 ret = par->fbtftops.verify_gpios(par);
 763                 if (ret < 0)
 764                         goto reg_fail;
 765         }
 766
 767         ret = par->fbtftops.init_display(par);
 768         if (ret < 0)
 769                 goto reg_fail;
 770         if (par->fbtftops.set_var) {
 771                 ret = par->fbtftops.set_var(par);
 772                 if (ret < 0)
 773                         goto reg_fail;
 774         }
 775
 776         /* update the entire display */
 777         par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
 778
 779         if (par->fbtftops.set_gamma && par->gamma.curves) {
 780                 ret = par->fbtftops.set_gamma(par, par->gamma.curves);
 781                 if (ret)
 782                         goto reg_fail;
 783         }
 784
 785         if (par->fbtftops.register_backlight)
 786                 par->fbtftops.register_backlight(par);
 787
 788         ret = register_framebuffer(fb_info);
 789         if (ret < 0)
 790                 goto reg_fail;
 791
 792         fbtft_sysfs_init(par);
 793
 794         if (par->txbuf.buf && par->txbuf.len >= 1024)
 795                 sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
 796         if (spi)
 797                 sprintf(text2, ", spi%d.%d at %d MHz", spi->controller->bus_num,
 798                         spi_get_chipselect(spi, 0), spi->max_speed_hz / 1000000);
 799         dev_info(fb_info->dev,
 800                  "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
 801                  fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
 802                  fb_info->fix.smem_len >> 10, text1,
 803                  HZ / fb_info->fbdefio->delay, text2);
 804
 805         /* Turn on backlight if available */
 806         if (fb_info->bl_dev) {
 807                 fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
 808                 fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
 809         }
 810
 811         return 0;
 812
 813 reg_fail:
 814         if (par->fbtftops.unregister_backlight)
 815                 par->fbtftops.unregister_backlight(par);
 816
 817         return ret;
 818 }
 819 EXPORT_SYMBOL(fbtft_register_framebuffer);
 820
 821 /**
 822  *      fbtft_unregister_framebuffer - releases a tft frame buffer device
 823  *      @fb_info: frame buffer info structure
 824  *
 825  *  Frees SPI driverdata if needed
 826  *  Frees gpios.
 827  *      Unregisters frame buffer device.
 828  *
 829  */
 830 int fbtft_unregister_framebuffer(struct fb_info *fb_info)
 831 {
 832         struct fbtft_par *par = fb_info->par;
 833
 834         if (par->fbtftops.unregister_backlight)
 835                 par->fbtftops.unregister_backlight(par);
 836         fbtft_sysfs_exit(par);
 837         unregister_framebuffer(fb_info);
 838
 839         return 0;
 840 }
 841 EXPORT_SYMBOL(fbtft_unregister_framebuffer);
 842
 843 /**
 844  * fbtft_init_display_from_property() - Device Tree init_display() function
 845  * @par: Driver data
 846  *
 847  * Return: 0 if successful, negative if error
 848  */
 849 static int fbtft_init_display_from_property(struct fbtft_par *par)
 850 {
 851         struct device *dev = par->info->device;
 852         int buf[64], count, index, i, j, ret;
 853         u32 *values;
 854         u32 val;
 855
 856         count = device_property_count_u32(dev, "init");
 857         if (count < 0)
 858                 return count;
 859         if (count == 0)
 860                 return -EINVAL;
 861
 862         values = kmalloc_array(count + 1, sizeof(*values), GFP_KERNEL);
 863         if (!values)
 864                 return -ENOMEM;
 865
 866         ret = device_property_read_u32_array(dev, "init", values, count);
 867         if (ret)
 868                 goto out_free;
 869
 870         par->fbtftops.reset(par);
 871
 872         index = -1;
 873         val = values[++index];
 874
 875         while (index < count) {
 876                 if (val & FBTFT_OF_INIT_CMD) {
 877                         val &= 0xFFFF;
 878                         i = 0;
 879                         while ((index < count) && !(val & 0xFFFF0000)) {
 880                                 if (i > 63) {
 881                                         dev_err(dev,
 882                                                 "%s: Maximum register values exceeded\n",
 883                                                 __func__);
 884                                         ret = -EINVAL;
 885                                         goto out_free;
 886                                 }
 887                                 buf[i++] = val;
 888                                 val = values[++index];
 889                         }
 890                         /* make debug message */
 891                         fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
 892                                       "init: write_register:\n");
 893                         for (j = 0; j < i; j++)
 894                                 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
 895                                               "buf[%d] = %02X\n", j, buf[j]);
 896
 897                         par->fbtftops.write_register(par, i,
 898                                 buf[0], buf[1], buf[2], buf[3],
 899                                 buf[4], buf[5], buf[6], buf[7],
 900                                 buf[8], buf[9], buf[10], buf[11],
 901                                 buf[12], buf[13], buf[14], buf[15],
 902                                 buf[16], buf[17], buf[18], buf[19],
 903                                 buf[20], buf[21], buf[22], buf[23],
 904                                 buf[24], buf[25], buf[26], buf[27],
 905                                 buf[28], buf[29], buf[30], buf[31],
 906                                 buf[32], buf[33], buf[34], buf[35],
 907                                 buf[36], buf[37], buf[38], buf[39],
 908                                 buf[40], buf[41], buf[42], buf[43],
 909                                 buf[44], buf[45], buf[46], buf[47],
 910                                 buf[48], buf[49], buf[50], buf[51],
 911                                 buf[52], buf[53], buf[54], buf[55],
 912                                 buf[56], buf[57], buf[58], buf[59],
 913                                 buf[60], buf[61], buf[62], buf[63]);
 914                 } else if (val & FBTFT_OF_INIT_DELAY) {
 915                         fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
 916                                       "init: msleep(%u)\n", val & 0xFFFF);
 917                         msleep(val & 0xFFFF);
 918                         val = values[++index];
 919                 } else {
 920                         dev_err(dev, "illegal init value 0x%X\n", val);
 921                         ret = -EINVAL;
 922                         goto out_free;
 923                 }
 924         }
 925
 926 out_free:
 927         kfree(values);
 928         return ret;
 929 }
 930
 931 /**
 932  * fbtft_init_display() - Generic init_display() function
 933  * @par: Driver data
 934  *
 935  * Uses par->init_sequence to do the initialization
 936  *
 937  * Return: 0 if successful, negative if error
 938  */
 939 int fbtft_init_display(struct fbtft_par *par)
 940 {
 941         int buf[64];
 942         int i;
 943         int j;
 944
 945         /* sanity check */
 946         if (!par->init_sequence) {
 947                 dev_err(par->info->device,
 948                         "error: init_sequence is not set\n");
 949                 return -EINVAL;
 950         }
 951
 952         /* make sure stop marker exists */
 953         for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++) {
 954                 if (par->init_sequence[i] == -3)
 955                         break;
 956         }
 957
 958         if (i == FBTFT_MAX_INIT_SEQUENCE) {
 959                 dev_err(par->info->device,
 960                         "missing stop marker at end of init sequence\n");
 961                 return -EINVAL;
 962         }
 963
 964         par->fbtftops.reset(par);
 965
 966         i = 0;
 967         while (i < FBTFT_MAX_INIT_SEQUENCE) {
 968                 if (par->init_sequence[i] == -3) {
 969                         /* done */
 970                         return 0;
 971                 }
 972                 if (par->init_sequence[i] >= 0) {
 973                         dev_err(par->info->device,
 974                                 "missing delimiter at position %d\n", i);
 975                         return -EINVAL;
 976                 }
 977                 if (par->init_sequence[i + 1] < 0) {
 978                         dev_err(par->info->device,
 979                                 "missing value after delimiter %d at position %d\n",
 980                                 par->init_sequence[i], i);
 981                         return -EINVAL;
 982                 }
 983                 switch (par->init_sequence[i]) {
 984                 case -1:
 985                         i++;
 986
 987                         /* make debug message */
 988                         for (j = 0; par->init_sequence[i + 1 + j] >= 0; j++)
 989                                 ;
 990
 991                         fbtft_par_dbg_hex(DEBUG_INIT_DISPLAY, par, par->info->device,
 992                                           s16, &par->init_sequence[i + 1], j,
 993                                           "init: write(0x%02X)", par->init_sequence[i]);
 994
 995                         /* Write */
 996                         j = 0;
 997                         while (par->init_sequence[i] >= 0) {
 998                                 if (j > 63) {
 999                                         dev_err(par->info->device,
1000                                                 "%s: Maximum register values exceeded\n",
1001                                                 __func__);
1002                                         return -EINVAL;
1003                                 }
1004                                 buf[j++] = par->init_sequence[i++];
1005                         }
1006                         par->fbtftops.write_register(par, j,
1007                                 buf[0], buf[1], buf[2], buf[3],
1008                                 buf[4], buf[5], buf[6], buf[7],
1009                                 buf[8], buf[9], buf[10], buf[11],
1010                                 buf[12], buf[13], buf[14], buf[15],
1011                                 buf[16], buf[17], buf[18], buf[19],
1012                                 buf[20], buf[21], buf[22], buf[23],
1013                                 buf[24], buf[25], buf[26], buf[27],
1014                                 buf[28], buf[29], buf[30], buf[31],
1015                                 buf[32], buf[33], buf[34], buf[35],
1016                                 buf[36], buf[37], buf[38], buf[39],
1017                                 buf[40], buf[41], buf[42], buf[43],
1018                                 buf[44], buf[45], buf[46], buf[47],
1019                                 buf[48], buf[49], buf[50], buf[51],
1020                                 buf[52], buf[53], buf[54], buf[55],
1021                                 buf[56], buf[57], buf[58], buf[59],
1022                                 buf[60], buf[61], buf[62], buf[63]);
1023                         break;
1024                 case -2:
1025                         i++;
1026                         fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1027                                       "init: mdelay(%d)\n",
1028                                       par->init_sequence[i]);
1029                         mdelay(par->init_sequence[i++]);
1030                         break;
1031                 default:
1032                         dev_err(par->info->device,
1033                                 "unknown delimiter %d at position %d\n",
1034                                 par->init_sequence[i], i);
1035                         return -EINVAL;
1036                 }
1037         }
1038
1039         dev_err(par->info->device,
1040                 "%s: something is wrong. Shouldn't get here.\n", __func__);
1041         return -EINVAL;
1042 }
1043 EXPORT_SYMBOL(fbtft_init_display);
1044
1045 /**
1046  * fbtft_verify_gpios() - Generic verify_gpios() function
1047  * @par: Driver data
1048  *
1049  * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
1050  *
1051  * Return: 0 if successful, negative if error
1052  */
1053 static int fbtft_verify_gpios(struct fbtft_par *par)
1054 {
1055         struct fbtft_platform_data *pdata = par->pdata;
1056         int i;
1057
1058         fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
1059
1060         if (pdata->display.buswidth != 9 &&  par->startbyte == 0 &&
1061             !par->gpio.dc) {
1062                 dev_err(par->info->device,
1063                         "Missing info about 'dc' gpio. Aborting.\n");
1064                 return -EINVAL;
1065         }
1066
1067         if (!par->pdev)
1068                 return 0;
1069
1070         if (!par->gpio.wr) {
1071                 dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
1072                 return -EINVAL;
1073         }
1074         for (i = 0; i < pdata->display.buswidth; i++) {
1075                 if (!par->gpio.db[i]) {
1076                         dev_err(par->info->device,
1077                                 "Missing 'db%02d' gpio. Aborting.\n", i);
1078                         return -EINVAL;
1079                 }
1080         }
1081
1082         return 0;
1083 }
1084
1085 /* returns 0 if the property is not present */
1086 static u32 fbtft_property_value(struct device *dev, const char *propname)
1087 {
1088         int ret;
1089         u32 val = 0;
1090
1091         ret = device_property_read_u32(dev, propname, &val);
1092         if (ret == 0)
1093                 dev_info(dev, "%s: %s = %u\n", __func__, propname, val);
1094
1095         return val;
1096 }
1097
1098 static struct fbtft_platform_data *fbtft_properties_read(struct device *dev)
1099 {
1100         struct fbtft_platform_data *pdata;
1101
1102         if (!dev_fwnode(dev)) {
1103                 dev_err(dev, "Missing platform data or properties\n");
1104                 return ERR_PTR(-EINVAL);
1105         }
1106
1107         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1108         if (!pdata)
1109                 return ERR_PTR(-ENOMEM);
1110
1111         pdata->display.width = fbtft_property_value(dev, "width");
1112         pdata->display.height = fbtft_property_value(dev, "height");
1113         pdata->display.regwidth = fbtft_property_value(dev, "regwidth");
1114         pdata->display.buswidth = fbtft_property_value(dev, "buswidth");
1115         pdata->display.backlight = fbtft_property_value(dev, "backlight");
1116         pdata->display.bpp = fbtft_property_value(dev, "bpp");
1117         pdata->display.debug = fbtft_property_value(dev, "debug");
1118         pdata->rotate = fbtft_property_value(dev, "rotate");
1119         pdata->bgr = device_property_read_bool(dev, "bgr");
1120         pdata->fps = fbtft_property_value(dev, "fps");
1121         pdata->txbuflen = fbtft_property_value(dev, "txbuflen");
1122         pdata->startbyte = fbtft_property_value(dev, "startbyte");
1123         device_property_read_string(dev, "gamma", (const char **)&pdata->gamma);
1124
1125         if (device_property_present(dev, "led-gpios"))
1126                 pdata->display.backlight = 1;
1127         if (device_property_present(dev, "init"))
1128                 pdata->display.fbtftops.init_display =
1129                         fbtft_init_display_from_property;
1130
1131         pdata->display.fbtftops.request_gpios = fbtft_request_gpios;
1132
1133         return pdata;
1134 }
1135
1136 /**
1137  * fbtft_probe_common() - Generic device probe() helper function
1138  * @display: Display properties
1139  * @sdev: SPI device
1140  * @pdev: Platform device
1141  *
1142  * Allocates, initializes and registers a framebuffer
1143  *
1144  * Either @sdev or @pdev should be NULL
1145  *
1146  * Return: 0 if successful, negative if error
1147  */
1148 int fbtft_probe_common(struct fbtft_display *display,
1149                        struct spi_device *sdev,
1150                        struct platform_device *pdev)
1151 {
1152         struct device *dev;
1153         struct fb_info *info;
1154         struct fbtft_par *par;
1155         struct fbtft_platform_data *pdata;
1156         int ret;
1157
1158         if (sdev)
1159                 dev = &sdev->dev;
1160         else
1161                 dev = &pdev->dev;
1162
1163         if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
1164                 dev_info(dev, "%s()\n", __func__);
1165
1166         pdata = dev->platform_data;
1167         if (!pdata) {
1168                 pdata = fbtft_properties_read(dev);
1169                 if (IS_ERR(pdata))
1170                         return PTR_ERR(pdata);
1171         }
1172
1173         info = fbtft_framebuffer_alloc(display, dev, pdata);
1174         if (!info)
1175                 return -ENOMEM;
1176
1177         par = info->par;
1178         par->spi = sdev;
1179         par->pdev = pdev;
1180
1181         if (display->buswidth == 0) {
1182                 dev_err(dev, "buswidth is not set\n");
1183                 return -EINVAL;
1184         }
1185
1186         /* write register functions */
1187         if (display->regwidth == 8 && display->buswidth == 8)
1188                 par->fbtftops.write_register = fbtft_write_reg8_bus8;
1189         else if (display->regwidth == 8 && display->buswidth == 9 && par->spi)
1190                 par->fbtftops.write_register = fbtft_write_reg8_bus9;
1191         else if (display->regwidth == 16 && display->buswidth == 8)
1192                 par->fbtftops.write_register = fbtft_write_reg16_bus8;
1193         else if (display->regwidth == 16 && display->buswidth == 16)
1194                 par->fbtftops.write_register = fbtft_write_reg16_bus16;
1195         else
1196                 dev_warn(dev,
1197                          "no default functions for regwidth=%d and buswidth=%d\n",
1198                          display->regwidth, display->buswidth);
1199
1200         /* write_vmem() functions */
1201         if (display->buswidth == 8)
1202                 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
1203         else if (display->buswidth == 9)
1204                 par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
1205         else if (display->buswidth == 16)
1206                 par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
1207
1208         /* GPIO write() functions */
1209         if (par->pdev) {
1210                 if (display->buswidth == 8)
1211                         par->fbtftops.write = fbtft_write_gpio8_wr;
1212                 else if (display->buswidth == 16)
1213                         par->fbtftops.write = fbtft_write_gpio16_wr;
1214         }
1215
1216         /* 9-bit SPI setup */
1217         if (par->spi && display->buswidth == 9) {
1218                 if (par->spi->controller->bits_per_word_mask & SPI_BPW_MASK(9)) {
1219                         par->spi->bits_per_word = 9;
1220                 } else {
1221                         dev_warn(&par->spi->dev,
1222                                  "9-bit SPI not available, emulating using 8-bit.\n");
1223                         /* allocate buffer with room for dc bits */
1224                         par->extra = devm_kzalloc(par->info->device,
1225                                                   par->txbuf.len +
1226                                                   (par->txbuf.len / 8) + 8,
1227                                                   GFP_KERNEL);
1228                         if (!par->extra) {
1229                                 ret = -ENOMEM;
1230                                 goto out_release;
1231                         }
1232                         par->fbtftops.write = fbtft_write_spi_emulate_9;
1233                 }
1234         }
1235
1236         if (!par->fbtftops.verify_gpios)
1237                 par->fbtftops.verify_gpios = fbtft_verify_gpios;
1238
1239         /* make sure we still use the driver provided functions */
1240         fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
1241
1242         /* use init_sequence if provided */
1243         if (par->init_sequence)
1244                 par->fbtftops.init_display = fbtft_init_display;
1245
1246         /* use platform_data provided functions above all */
1247         fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
1248
1249         ret = fbtft_register_framebuffer(info);
1250         if (ret < 0)
1251                 goto out_release;
1252
1253         return 0;
1254
1255 out_release:
1256         fbtft_framebuffer_release(info);
1257
1258         return ret;
1259 }
1260 EXPORT_SYMBOL(fbtft_probe_common);
1261
1262 /**
1263  * fbtft_remove_common() - Generic device remove() helper function
1264  * @dev: Device
1265  * @info: Framebuffer
1266  *
1267  * Unregisters and releases the framebuffer
1268  */
1269 void fbtft_remove_common(struct device *dev, struct fb_info *info)
1270 {
1271         struct fbtft_par *par;
1272
1273         par = info->par;
1274         if (par)
1275                 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
1276                               "%s()\n", __func__);
1277         fbtft_unregister_framebuffer(info);
1278         fbtft_framebuffer_release(info);
1279 }
1280 EXPORT_SYMBOL(fbtft_remove_common);
1281
1282 MODULE_LICENSE("GPL");