drivers/video/vidconsole-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * (C) Copyright 2001-2015
   5  * DENX Software Engineering -- wd@denx.de
   6  * Compulab Ltd - http://compulab.co.il/
   7  * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
   8  */
   9
  10 #include <common.h>
  11 #include <linux/ctype.h>
  12 #include <dm.h>
  13 #include <video.h>
  14 #include <video_console.h>
  15 #include <video_font.h>         /* Bitmap font for code page 437 */
  16
  17 /*
  18  * Structure to describe a console color
  19  */
  20 struct vid_rgb {
  21         u32 r;
  22         u32 g;
  23         u32 b;
  24 };
  25
  26 /* By default we scroll by a single line */
  27 #ifndef CONFIG_CONSOLE_SCROLL_LINES
  28 #define CONFIG_CONSOLE_SCROLL_LINES 1
  29 #endif
  30
  31 int vidconsole_putc_xy(struct udevice *dev, uint x, uint y, char ch)
  32 {
  33         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  34
  35         if (!ops->putc_xy)
  36                 return -ENOSYS;
  37         return ops->putc_xy(dev, x, y, ch);
  38 }
  39
  40 int vidconsole_move_rows(struct udevice *dev, uint rowdst, uint rowsrc,
  41                          uint count)
  42 {
  43         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  44
  45         if (!ops->move_rows)
  46                 return -ENOSYS;
  47         return ops->move_rows(dev, rowdst, rowsrc, count);
  48 }
  49
  50 int vidconsole_set_row(struct udevice *dev, uint row, int clr)
  51 {
  52         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  53
  54         if (!ops->set_row)
  55                 return -ENOSYS;
  56         return ops->set_row(dev, row, clr);
  57 }
  58
  59 static int vidconsole_entry_start(struct udevice *dev)
  60 {
  61         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  62
  63         if (!ops->entry_start)
  64                 return -ENOSYS;
  65         return ops->entry_start(dev);
  66 }
  67
  68 /* Move backwards one space */
  69 static int vidconsole_back(struct udevice *dev)
  70 {
  71         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
  72         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  73         int ret;
  74
  75         if (ops->backspace) {
  76                 ret = ops->backspace(dev);
  77                 if (ret != -ENOSYS)
  78                         return ret;
  79         }
  80
  81         priv->xcur_frac -= VID_TO_POS(priv->x_charsize);
  82         if (priv->xcur_frac < priv->xstart_frac) {
  83                 priv->xcur_frac = (priv->cols - 1) *
  84                         VID_TO_POS(priv->x_charsize);
  85                 priv->ycur -= priv->y_charsize;
  86                 if (priv->ycur < 0)
  87                         priv->ycur = 0;
  88         }
  89         video_sync(dev->parent);
  90
  91         return 0;
  92 }
  93
  94 /* Move to a newline, scrolling the display if necessary */
  95 static void vidconsole_newline(struct udevice *dev)
  96 {
  97         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
  98         struct udevice *vid_dev = dev->parent;
  99         struct video_priv *vid_priv = dev_get_uclass_priv(vid_dev);
 100         const int rows = CONFIG_CONSOLE_SCROLL_LINES;
 101         int i;
 102
 103         priv->xcur_frac = priv->xstart_frac;
 104         priv->ycur += priv->y_charsize;
 105
 106         /* Check if we need to scroll the terminal */
 107         if ((priv->ycur + priv->y_charsize) / priv->y_charsize > priv->rows) {
 108                 vidconsole_move_rows(dev, 0, rows, priv->rows - rows);
 109                 for (i = 0; i < rows; i++)
 110                         vidconsole_set_row(dev, priv->rows - i - 1,
 111                                            vid_priv->colour_bg);
 112                 priv->ycur -= rows * priv->y_charsize;
 113         }
 114         priv->last_ch = 0;
 115
 116         video_sync(dev->parent);
 117 }
 118
 119 static const struct vid_rgb colors[VID_COLOR_COUNT] = {
 120         { 0x00, 0x00, 0x00 },  /* black */
 121         { 0xc0, 0x00, 0x00 },  /* red */
 122         { 0x00, 0xc0, 0x00 },  /* green */
 123         { 0xc0, 0x60, 0x00 },  /* brown */
 124         { 0x00, 0x00, 0xc0 },  /* blue */
 125         { 0xc0, 0x00, 0xc0 },  /* magenta */
 126         { 0x00, 0xc0, 0xc0 },  /* cyan */
 127         { 0xc0, 0xc0, 0xc0 },  /* light gray */
 128         { 0x80, 0x80, 0x80 },  /* gray */
 129         { 0xff, 0x00, 0x00 },  /* bright red */
 130         { 0x00, 0xff, 0x00 },  /* bright green */
 131         { 0xff, 0xff, 0x00 },  /* yellow */
 132         { 0x00, 0x00, 0xff },  /* bright blue */
 133         { 0xff, 0x00, 0xff },  /* bright magenta */
 134         { 0x00, 0xff, 0xff },  /* bright cyan */
 135         { 0xff, 0xff, 0xff },  /* white */
 136 };
 137
 138 u32 vid_console_color(struct video_priv *priv, unsigned int idx)
 139 {
 140         switch (priv->bpix) {
 141         case VIDEO_BPP16:
 142                 return ((colors[idx].r >> 3) << 11) |
 143                        ((colors[idx].g >> 2) <<  5) |
 144                        ((colors[idx].b >> 3) <<  0);
 145         case VIDEO_BPP32:
 146                 return (colors[idx].r << 16) |
 147                        (colors[idx].g <<  8) |
 148                        (colors[idx].b <<  0);
 149         default:
 150                 /*
 151                  * For unknown bit arrangements just support
 152                  * black and white.
 153                  */
 154                 if (idx)
 155                         return 0xffffff; /* white */
 156                 else
 157                         return 0x000000; /* black */
 158         }
 159 }
 160
 161 static char *parsenum(char *s, int *num)
 162 {
 163         char *end;
 164         *num = simple_strtol(s, &end, 10);
 165         return end;
 166 }
 167
 168 /*
 169  * Process a character while accumulating an escape string.  Chars are
 170  * accumulated into escape_buf until the end of escape sequence is
 171  * found, at which point the sequence is parsed and processed.
 172  */
 173 static void vidconsole_escape_char(struct udevice *dev, char ch)
 174 {
 175         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 176
 177         if (!IS_ENABLED(CONFIG_VIDEO_ANSI))
 178                 goto error;
 179
 180         /* Sanity checking for bogus ESC sequences: */
 181         if (priv->escape_len >= sizeof(priv->escape_buf))
 182                 goto error;
 183         if (priv->escape_len == 0 && ch != '[')
 184                 goto error;
 185
 186         priv->escape_buf[priv->escape_len++] = ch;
 187
 188         /*
 189          * Escape sequences are terminated by a letter, so keep
 190          * accumulating until we get one:
 191          */
 192         if (!isalpha(ch))
 193                 return;
 194
 195         /*
 196          * clear escape mode first, otherwise things will get highly
 197          * surprising if you hit any debug prints that come back to
 198          * this console.
 199          */
 200         priv->escape = 0;
 201
 202         switch (ch) {
 203         case 'H':
 204         case 'f': {
 205                 int row, col;
 206                 char *s = priv->escape_buf;
 207
 208                 /*
 209                  * Set cursor position: [%d;%df or [%d;%dH
 210                  */
 211                 s++;    /* [ */
 212                 s = parsenum(s, &row);
 213                 s++;    /* ; */
 214                 s = parsenum(s, &col);
 215
 216                 priv->ycur = row * priv->y_charsize;
 217                 priv->xcur_frac = priv->xstart_frac +
 218                         VID_TO_POS(col * priv->x_charsize);
 219
 220                 break;
 221         }
 222         case 'J': {
 223                 int mode;
 224
 225                 /*
 226                  * Clear part/all screen:
 227                  *   [J or [0J - clear screen from cursor down
 228                  *   [1J       - clear screen from cursor up
 229                  *   [2J       - clear entire screen
 230                  *
 231                  * TODO we really only handle entire-screen case, others
 232                  * probably require some additions to video-uclass (and
 233                  * are not really needed yet by efi_console)
 234                  */
 235                 parsenum(priv->escape_buf + 1, &mode);
 236
 237                 if (mode == 2) {
 238                         video_clear(dev->parent);
 239                         video_sync(dev->parent);
 240                         priv->ycur = 0;
 241                         priv->xcur_frac = priv->xstart_frac;
 242                 } else {
 243                         debug("unsupported clear mode: %d\n", mode);
 244                 }
 245                 break;
 246         }
 247         case 'm': {
 248                 struct video_priv *vid_priv = dev_get_uclass_priv(dev->parent);
 249                 char *s = priv->escape_buf;
 250                 char *end = &priv->escape_buf[priv->escape_len];
 251
 252                 /*
 253                  * Set graphics mode: [%d;...;%dm
 254                  *
 255                  * Currently only supports the color attributes:
 256                  *
 257                  * Foreground Colors:
 258                  *
 259                  *   30 Black
 260                  *   31 Red
 261                  *   32 Green
 262                  *   33 Yellow
 263                  *   34 Blue
 264                  *   35 Magenta
 265                  *   36 Cyan
 266                  *   37 White
 267                  *
 268                  * Background Colors:
 269                  *
 270                  *   40 Black
 271                  *   41 Red
 272                  *   42 Green
 273                  *   43 Yellow
 274                  *   44 Blue
 275                  *   45 Magenta
 276                  *   46 Cyan
 277                  *   47 White
 278                  */
 279
 280                 s++;    /* [ */
 281                 while (s < end) {
 282                         int val;
 283
 284                         s = parsenum(s, &val);
 285                         s++;
 286
 287                         switch (val) {
 288                         case 0:
 289                                 /* all attributes off */
 290                                 video_set_default_colors(vid_priv);
 291                                 break;
 292                         case 1:
 293                                 /* bold */
 294                                 vid_priv->fg_col_idx |= 8;
 295                                 vid_priv->colour_fg = vid_console_color(
 296                                                 vid_priv, vid_priv->fg_col_idx);
 297                                 break;
 298                         case 30 ... 37:
 299                                 /* foreground color */
 300                                 vid_priv->fg_col_idx &= ~7;
 301                                 vid_priv->fg_col_idx |= val - 30;
 302                                 vid_priv->colour_fg = vid_console_color(
 303                                                 vid_priv, vid_priv->fg_col_idx);
 304                                 break;
 305                         case 40 ... 47:
 306                                 /* background color */
 307                                 vid_priv->colour_bg = vid_console_color(
 308                                                         vid_priv, val - 40);
 309                                 break;
 310                         default:
 311                                 /* ignore unsupported SGR parameter */
 312                                 break;
 313                         }
 314                 }
 315
 316                 break;
 317         }
 318         default:
 319                 debug("unrecognized escape sequence: %*s\n",
 320                       priv->escape_len, priv->escape_buf);
 321         }
 322
 323         return;
 324
 325 error:
 326         /* something went wrong, just revert to normal mode: */
 327         priv->escape = 0;
 328 }
 329
 330 int vidconsole_put_char(struct udevice *dev, char ch)
 331 {
 332         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 333         int ret;
 334
 335         if (priv->escape) {
 336                 vidconsole_escape_char(dev, ch);
 337                 return 0;
 338         }
 339
 340         switch (ch) {
 341         case '\x1b':
 342                 priv->escape_len = 0;
 343                 priv->escape = 1;
 344                 break;
 345         case '\a':
 346                 /* beep */
 347                 break;
 348         case '\r':
 349                 priv->xcur_frac = priv->xstart_frac;
 350                 break;
 351         case '\n':
 352                 vidconsole_newline(dev);
 353                 vidconsole_entry_start(dev);
 354                 break;
 355         case '\t':      /* Tab (8 chars alignment) */
 356                 priv->xcur_frac = ((priv->xcur_frac / priv->tab_width_frac)
 357                                 + 1) * priv->tab_width_frac;
 358
 359                 if (priv->xcur_frac >= priv->xsize_frac)
 360                         vidconsole_newline(dev);
 361                 break;
 362         case '\b':
 363                 vidconsole_back(dev);
 364                 priv->last_ch = 0;
 365                 break;
 366         default:
 367                 /*
 368                  * Failure of this function normally indicates an unsupported
 369                  * colour depth. Check this and return an error to help with
 370                  * diagnosis.
 371                  */
 372                 ret = vidconsole_putc_xy(dev, priv->xcur_frac, priv->ycur, ch);
 373                 if (ret == -EAGAIN) {
 374                         vidconsole_newline(dev);
 375                         ret = vidconsole_putc_xy(dev, priv->xcur_frac,
 376                                                  priv->ycur, ch);
 377                 }
 378                 if (ret < 0)
 379                         return ret;
 380                 priv->xcur_frac += ret;
 381                 priv->last_ch = ch;
 382                 if (priv->xcur_frac >= priv->xsize_frac)
 383                         vidconsole_newline(dev);
 384                 break;
 385         }
 386
 387         return 0;
 388 }
 389
 390 static void vidconsole_putc(struct stdio_dev *sdev, const char ch)
 391 {
 392         struct udevice *dev = sdev->priv;
 393
 394         vidconsole_put_char(dev, ch);
 395         video_sync(dev->parent);
 396 }
 397
 398 static void vidconsole_puts(struct stdio_dev *sdev, const char *s)
 399 {
 400         struct udevice *dev = sdev->priv;
 401
 402         while (*s)
 403                 vidconsole_put_char(dev, *s++);
 404         video_sync(dev->parent);
 405 }
 406
 407 /* Set up the number of rows and colours (rotated drivers override this) */
 408 static int vidconsole_pre_probe(struct udevice *dev)
 409 {
 410         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 411         struct udevice *vid = dev->parent;
 412         struct video_priv *vid_priv = dev_get_uclass_priv(vid);
 413
 414         priv->xsize_frac = VID_TO_POS(vid_priv->xsize);
 415
 416         return 0;
 417 }
 418
 419 /* Register the device with stdio */
 420 static int vidconsole_post_probe(struct udevice *dev)
 421 {
 422         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 423         struct stdio_dev *sdev = &priv->sdev;
 424
 425         if (!priv->tab_width_frac)
 426                 priv->tab_width_frac = VID_TO_POS(priv->x_charsize) * 8;
 427
 428         if (dev->seq) {
 429                 snprintf(sdev->name, sizeof(sdev->name), "vidconsole%d",
 430                          dev->seq);
 431         } else {
 432                 strcpy(sdev->name, "vidconsole");
 433         }
 434
 435         sdev->flags = DEV_FLAGS_OUTPUT;
 436         sdev->putc = vidconsole_putc;
 437         sdev->puts = vidconsole_puts;
 438         sdev->priv = dev;
 439
 440         return stdio_register(sdev);
 441 }
 442
 443 UCLASS_DRIVER(vidconsole) = {
 444         .id             = UCLASS_VIDEO_CONSOLE,
 445         .name           = "vidconsole0",
 446         .pre_probe      = vidconsole_pre_probe,
 447         .post_probe     = vidconsole_post_probe,
 448         .per_device_auto_alloc_size     = sizeof(struct vidconsole_priv),
 449 };
 450
 451 void vidconsole_position_cursor(struct udevice *dev, unsigned col, unsigned row)
 452 {
 453         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 454         struct udevice *vid_dev = dev->parent;
 455         struct video_priv *vid_priv = dev_get_uclass_priv(vid_dev);
 456
 457         priv->xcur_frac = VID_TO_POS(min_t(short, col, vid_priv->xsize - 1));
 458         priv->ycur = min_t(short, row, vid_priv->ysize - 1);
 459 }
 460
 461 static int do_video_setcursor(cmd_tbl_t *cmdtp, int flag, int argc,
 462                               char *const argv[])
 463 {
 464         unsigned int col, row;
 465         struct udevice *dev;
 466
 467         if (argc != 3)
 468                 return CMD_RET_USAGE;
 469
 470         if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
 471                 return CMD_RET_FAILURE;
 472         col = simple_strtoul(argv[1], NULL, 10);
 473         row = simple_strtoul(argv[2], NULL, 10);
 474         vidconsole_position_cursor(dev, col, row);
 475
 476         return 0;
 477 }
 478
 479 static int do_video_puts(cmd_tbl_t *cmdtp, int flag, int argc,
 480                          char *const argv[])
 481 {
 482         struct udevice *dev;
 483         const char *s;
 484
 485         if (argc != 2)
 486                 return CMD_RET_USAGE;
 487
 488         if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
 489                 return CMD_RET_FAILURE;
 490         for (s = argv[1]; *s; s++)
 491                 vidconsole_put_char(dev, *s);
 492
 493         video_sync(dev->parent);
 494
 495         return 0;
 496 }
 497
 498 U_BOOT_CMD(
 499         setcurs, 3,     1,      do_video_setcursor,
 500         "set cursor position within screen",
 501         "    <col> <row> in character"
 502 );
 503
 504 U_BOOT_CMD(
 505         lcdputs, 2,     1,      do_video_puts,
 506         "print string on video framebuffer",
 507         "    <string>"
 508 );