drivers/s390/char/tty3270.c

   1 /*
   2  *  drivers/s390/char/tty3270.c
   3  *    IBM/3270 Driver - tty functions.
   4  *
   5  *  Author(s):
   6  *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   7  *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  *      -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kdev_t.h>
  14 #include <linux/tty.h>
  15 #include <linux/vt_kern.h>
  16 #include <linux/init.h>
  17 #include <linux/console.h>
  18 #include <linux/interrupt.h>
  19
  20 #include <linux/slab.h>
  21 #include <linux/bootmem.h>
  22
  23 #include <asm/ccwdev.h>
  24 #include <asm/cio.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/uaccess.h>
  27
  28 #include "raw3270.h"
  29 #include "tty3270.h"
  30 #include "keyboard.h"
  31
  32 #define TTY3270_CHAR_BUF_SIZE 256
  33 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
  34 #define TTY3270_STRING_PAGES 5
  35
  36 struct tty_driver *tty3270_driver;
  37 static int tty3270_max_index;
  38
  39 static struct raw3270_fn tty3270_fn;
  40
  41 struct tty3270_cell {
  42         unsigned char character;
  43         unsigned char highlight;
  44         unsigned char f_color;
  45 };
  46
  47 struct tty3270_line {
  48         struct tty3270_cell *cells;
  49         int len;
  50 };
  51
  52 #define ESCAPE_NPAR 8
  53
  54 /*
  55  * The main tty view data structure.
  56  * FIXME:
  57  * 1) describe line orientation & lines list concept against screen
  58  * 2) describe conversion of screen to lines
  59  * 3) describe line format.
  60  */
  61 struct tty3270 {
  62         struct raw3270_view view;
  63         struct tty_struct *tty;         /* Pointer to tty structure */
  64         void **freemem_pages;           /* Array of pages used for freemem. */
  65         struct list_head freemem;       /* List of free memory for strings. */
  66
  67         /* Output stuff. */
  68         struct list_head lines;         /* List of lines. */
  69         struct list_head update;        /* List of lines to update. */
  70         unsigned char wcc;              /* Write control character. */
  71         int nr_lines;                   /* # lines in list. */
  72         int nr_up;                      /* # lines up in history. */
  73         unsigned long update_flags;     /* Update indication bits. */
  74         struct string *status;          /* Lower right of display. */
  75         struct raw3270_request *write;  /* Single write request. */
  76         struct timer_list timer;        /* Output delay timer. */
  77
  78         /* Current tty screen. */
  79         unsigned int cx, cy;            /* Current output position. */
  80         unsigned int highlight;         /* Blink/reverse/underscore */
  81         unsigned int f_color;           /* Foreground color */
  82         struct tty3270_line *screen;
  83
  84         /* Input stuff. */
  85         struct string *prompt;          /* Output string for input area. */
  86         struct string *input;           /* Input string for read request. */
  87         struct raw3270_request *read;   /* Single read request. */
  88         struct raw3270_request *kreset; /* Single keyboard reset request. */
  89         unsigned char inattr;           /* Visible/invisible input. */
  90         int throttle, attn;             /* tty throttle/unthrottle. */
  91         struct tasklet_struct readlet;  /* Tasklet to issue read request. */
  92         struct kbd_data *kbd;           /* key_maps stuff. */
  93
  94         /* Escape sequence parsing. */
  95         int esc_state, esc_ques, esc_npar;
  96         int esc_par[ESCAPE_NPAR];
  97         unsigned int saved_cx, saved_cy;
  98         unsigned int saved_highlight, saved_f_color;
  99
 100         /* Command recalling. */
 101         struct list_head rcl_lines;     /* List of recallable lines. */
 102         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
 103         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
 104
 105         /* Character array for put_char/flush_chars. */
 106         unsigned int char_count;
 107         char char_buf[TTY3270_CHAR_BUF_SIZE];
 108 };
 109
 110 /* tty3270->update_flags. See tty3270_update for details. */
 111 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
 112 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
 113 #define TTY_UPDATE_INPUT        4       /* Update input line. */
 114 #define TTY_UPDATE_STATUS       8       /* Update status line. */
 115 #define TTY_UPDATE_ALL          15
 116
 117 static void tty3270_update(struct tty3270 *);
 118
 119 /*
 120  * Setup timeout for a device. On timeout trigger an update.
 121  */
 122 static void tty3270_set_timer(struct tty3270 *tp, int expires)
 123 {
 124         if (expires == 0) {
 125                 if (timer_pending(&tp->timer) && del_timer(&tp->timer))
 126                         raw3270_put_view(&tp->view);
 127                 return;
 128         }
 129         if (timer_pending(&tp->timer) &&
 130             mod_timer(&tp->timer, jiffies + expires))
 131                 return;
 132         raw3270_get_view(&tp->view);
 133         tp->timer.function = (void (*)(unsigned long)) tty3270_update;
 134         tp->timer.data = (unsigned long) tp;
 135         tp->timer.expires = jiffies + expires;
 136         add_timer(&tp->timer);
 137 }
 138
 139 /*
 140  * The input line are the two last lines of the screen.
 141  */
 142 static void
 143 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
 144 {
 145         struct string *line;
 146         unsigned int off;
 147
 148         line = tp->prompt;
 149         if (count != 0)
 150                 line->string[5] = TF_INMDT;
 151         else
 152                 line->string[5] = tp->inattr;
 153         if (count > tp->view.cols * 2 - 11)
 154                 count = tp->view.cols * 2 - 11;
 155         memcpy(line->string + 6, input, count);
 156         line->string[6 + count] = TO_IC;
 157         /* Clear to end of input line. */
 158         if (count < tp->view.cols * 2 - 11) {
 159                 line->string[7 + count] = TO_RA;
 160                 line->string[10 + count] = 0;
 161                 off = tp->view.cols * tp->view.rows - 9;
 162                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
 163                 line->len = 11 + count;
 164         } else
 165                 line->len = 7 + count;
 166         tp->update_flags |= TTY_UPDATE_INPUT;
 167 }
 168
 169 static void
 170 tty3270_create_prompt(struct tty3270 *tp)
 171 {
 172         static const unsigned char blueprint[] =
 173                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
 174                   /* empty input string */
 175                   TO_IC, TO_RA, 0, 0, 0 };
 176         struct string *line;
 177         unsigned int offset;
 178
 179         line = alloc_string(&tp->freemem,
 180                             sizeof(blueprint) + tp->view.cols * 2 - 9);
 181         tp->prompt = line;
 182         tp->inattr = TF_INPUT;
 183         /* Copy blueprint to status line */
 184         memcpy(line->string, blueprint, sizeof(blueprint));
 185         line->len = sizeof(blueprint);
 186         /* Set output offsets. */
 187         offset = tp->view.cols * (tp->view.rows - 2);
 188         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 189         offset = tp->view.cols * tp->view.rows - 9;
 190         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
 191
 192         /* Allocate input string for reading. */
 193         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
 194 }
 195
 196 /*
 197  * The status line is the last line of the screen. It shows the string
 198  * "Running"/"Holding" in the lower right corner of the screen.
 199  */
 200 static void
 201 tty3270_update_status(struct tty3270 * tp)
 202 {
 203         char *str;
 204
 205         str = (tp->nr_up != 0) ? "History" : "Running";
 206         memcpy(tp->status->string + 8, str, 7);
 207         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 208         tp->update_flags |= TTY_UPDATE_STATUS;
 209 }
 210
 211 static void
 212 tty3270_create_status(struct tty3270 * tp)
 213 {
 214         static const unsigned char blueprint[] =
 215                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
 216                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
 217                   TAC_RESET };
 218         struct string *line;
 219         unsigned int offset;
 220
 221         line = alloc_string(&tp->freemem,sizeof(blueprint));
 222         tp->status = line;
 223         /* Copy blueprint to status line */
 224         memcpy(line->string, blueprint, sizeof(blueprint));
 225         /* Set address to start of status string (= last 9 characters). */
 226         offset = tp->view.cols * tp->view.rows - 9;
 227         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 228 }
 229
 230 /*
 231  * Set output offsets to 3270 datastream fragment of a tty string.
 232  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
 233  */
 234 static void
 235 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
 236 {
 237         unsigned char *cp;
 238
 239         raw3270_buffer_address(tp->view.dev, line->string + 1,
 240                                tp->view.cols * nr);
 241         cp = line->string + line->len - 4;
 242         if (*cp == TO_RA)
 243                 raw3270_buffer_address(tp->view.dev, cp + 1,
 244                                        tp->view.cols * (nr + 1));
 245 }
 246
 247 /*
 248  * Rebuild update list to print all lines.
 249  */
 250 static void
 251 tty3270_rebuild_update(struct tty3270 *tp)
 252 {
 253         struct string *s, *n;
 254         int line, nr_up;
 255
 256         /*
 257          * Throw away update list and create a new one,
 258          * containing all lines that will fit on the screen.
 259          */
 260         list_for_each_entry_safe(s, n, &tp->update, update)
 261                 list_del_init(&s->update);
 262         line = tp->view.rows - 3;
 263         nr_up = tp->nr_up;
 264         list_for_each_entry_reverse(s, &tp->lines, list) {
 265                 if (nr_up > 0) {
 266                         nr_up--;
 267                         continue;
 268                 }
 269                 tty3270_update_string(tp, s, line);
 270                 list_add(&s->update, &tp->update);
 271                 if (--line < 0)
 272                         break;
 273         }
 274         tp->update_flags |= TTY_UPDATE_LIST;
 275 }
 276
 277 /*
 278  * Alloc string for size bytes. If there is not enough room in
 279  * freemem, free strings until there is room.
 280  */
 281 static struct string *
 282 tty3270_alloc_string(struct tty3270 *tp, size_t size)
 283 {
 284         struct string *s, *n;
 285
 286         s = alloc_string(&tp->freemem, size);
 287         if (s)
 288                 return s;
 289         list_for_each_entry_safe(s, n, &tp->lines, list) {
 290                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
 291                 list_del(&s->list);
 292                 if (!list_empty(&s->update))
 293                         list_del(&s->update);
 294                 tp->nr_lines--;
 295                 if (free_string(&tp->freemem, s) >= size)
 296                         break;
 297         }
 298         s = alloc_string(&tp->freemem, size);
 299         BUG_ON(!s);
 300         if (tp->nr_up != 0 &&
 301             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
 302                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
 303                 tty3270_rebuild_update(tp);
 304                 tty3270_update_status(tp);
 305         }
 306         return s;
 307 }
 308
 309 /*
 310  * Add an empty line to the list.
 311  */
 312 static void
 313 tty3270_blank_line(struct tty3270 *tp)
 314 {
 315         static const unsigned char blueprint[] =
 316                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
 317                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
 318         struct string *s;
 319
 320         s = tty3270_alloc_string(tp, sizeof(blueprint));
 321         memcpy(s->string, blueprint, sizeof(blueprint));
 322         s->len = sizeof(blueprint);
 323         list_add_tail(&s->list, &tp->lines);
 324         tp->nr_lines++;
 325         if (tp->nr_up != 0)
 326                 tp->nr_up++;
 327 }
 328
 329 /*
 330  * Write request completion callback.
 331  */
 332 static void
 333 tty3270_write_callback(struct raw3270_request *rq, void *data)
 334 {
 335         struct tty3270 *tp;
 336
 337         tp = (struct tty3270 *) rq->view;
 338         if (rq->rc != 0) {
 339                 /* Write wasn't successfull. Refresh all. */
 340                 tty3270_rebuild_update(tp);
 341                 tp->update_flags = TTY_UPDATE_ALL;
 342                 tty3270_set_timer(tp, 1);
 343         }
 344         raw3270_request_reset(rq);
 345         xchg(&tp->write, rq);
 346 }
 347
 348 /*
 349  * Update 3270 display.
 350  */
 351 static void
 352 tty3270_update(struct tty3270 *tp)
 353 {
 354         static char invalid_sba[2] = { 0xff, 0xff };
 355         struct raw3270_request *wrq;
 356         unsigned long updated;
 357         struct string *s, *n;
 358         char *sba, *str;
 359         int rc, len;
 360
 361         wrq = xchg(&tp->write, 0);
 362         if (!wrq) {
 363                 tty3270_set_timer(tp, 1);
 364                 return;
 365         }
 366
 367         spin_lock(&tp->view.lock);
 368         updated = 0;
 369         if (tp->update_flags & TTY_UPDATE_ERASE) {
 370                 /* Use erase write alternate to erase display. */
 371                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 372                 updated |= TTY_UPDATE_ERASE;
 373         } else
 374                 raw3270_request_set_cmd(wrq, TC_WRITE);
 375
 376         raw3270_request_add_data(wrq, &tp->wcc, 1);
 377         tp->wcc = TW_NONE;
 378
 379         /*
 380          * Update status line.
 381          */
 382         if (tp->update_flags & TTY_UPDATE_STATUS)
 383                 if (raw3270_request_add_data(wrq, tp->status->string,
 384                                              tp->status->len) == 0)
 385                         updated |= TTY_UPDATE_STATUS;
 386
 387         /*
 388          * Write input line.
 389          */
 390         if (tp->update_flags & TTY_UPDATE_INPUT)
 391                 if (raw3270_request_add_data(wrq, tp->prompt->string,
 392                                              tp->prompt->len) == 0)
 393                         updated |= TTY_UPDATE_INPUT;
 394
 395         sba = invalid_sba;
 396
 397         if (tp->update_flags & TTY_UPDATE_LIST) {
 398                 /* Write strings in the update list to the screen. */
 399                 list_for_each_entry_safe(s, n, &tp->update, update) {
 400                         str = s->string;
 401                         len = s->len;
 402                         /*
 403                          * Skip TO_SBA at the start of the string if the
 404                          * last output position matches the start address
 405                          * of this line.
 406                          */
 407                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
 408                                 str += 3, len -= 3;
 409                         if (raw3270_request_add_data(wrq, str, len) != 0)
 410                                 break;
 411                         list_del_init(&s->update);
 412                         sba = s->string + s->len - 3;
 413                 }
 414                 if (list_empty(&tp->update))
 415                         updated |= TTY_UPDATE_LIST;
 416         }
 417         wrq->callback = tty3270_write_callback;
 418         rc = raw3270_start(&tp->view, wrq);
 419         if (rc == 0) {
 420                 tp->update_flags &= ~updated;
 421                 if (tp->update_flags)
 422                         tty3270_set_timer(tp, 1);
 423         } else {
 424                 raw3270_request_reset(wrq);
 425                 xchg(&tp->write, wrq);
 426         }
 427         spin_unlock(&tp->view.lock);
 428         raw3270_put_view(&tp->view);
 429 }
 430
 431 /*
 432  * Command recalling.
 433  */
 434 static void
 435 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
 436 {
 437         struct string *s;
 438
 439         tp->rcl_walk = NULL;
 440         if (len <= 0)
 441                 return;
 442         if (tp->rcl_nr >= tp->rcl_max) {
 443                 s = list_entry(tp->rcl_lines.next, struct string, list);
 444                 list_del(&s->list);
 445                 free_string(&tp->freemem, s);
 446                 tp->rcl_nr--;
 447         }
 448         s = tty3270_alloc_string(tp, len);
 449         memcpy(s->string, input, len);
 450         list_add_tail(&s->list, &tp->rcl_lines);
 451         tp->rcl_nr++;
 452 }
 453
 454 static void
 455 tty3270_rcl_backward(struct kbd_data *kbd)
 456 {
 457         struct tty3270 *tp;
 458         struct string *s;
 459
 460         tp = kbd->tty->driver_data;
 461         spin_lock_bh(&tp->view.lock);
 462         if (tp->inattr == TF_INPUT) {
 463                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
 464                         tp->rcl_walk = tp->rcl_walk->prev;
 465                 else if (!list_empty(&tp->rcl_lines))
 466                         tp->rcl_walk = tp->rcl_lines.prev;
 467                 s = tp->rcl_walk ?
 468                         list_entry(tp->rcl_walk, struct string, list) : NULL;
 469                 if (tp->rcl_walk) {
 470                         s = list_entry(tp->rcl_walk, struct string, list);
 471                         tty3270_update_prompt(tp, s->string, s->len);
 472                 } else
 473                         tty3270_update_prompt(tp, NULL, 0);
 474                 tty3270_set_timer(tp, 1);
 475         }
 476         spin_unlock_bh(&tp->view.lock);
 477 }
 478
 479 /*
 480  * Deactivate tty view.
 481  */
 482 static void
 483 tty3270_exit_tty(struct kbd_data *kbd)
 484 {
 485         struct tty3270 *tp;
 486
 487         tp = kbd->tty->driver_data;
 488         raw3270_deactivate_view(&tp->view);
 489 }
 490
 491 /*
 492  * Scroll forward in history.
 493  */
 494 static void
 495 tty3270_scroll_forward(struct kbd_data *kbd)
 496 {
 497         struct tty3270 *tp;
 498         int nr_up;
 499
 500         tp = kbd->tty->driver_data;
 501         spin_lock_bh(&tp->view.lock);
 502         nr_up = tp->nr_up - tp->view.rows + 2;
 503         if (nr_up < 0)
 504                 nr_up = 0;
 505         if (nr_up != tp->nr_up) {
 506                 tp->nr_up = nr_up;
 507                 tty3270_rebuild_update(tp);
 508                 tty3270_update_status(tp);
 509                 tty3270_set_timer(tp, 1);
 510         }
 511         spin_unlock_bh(&tp->view.lock);
 512 }
 513
 514 /*
 515  * Scroll backward in history.
 516  */
 517 static void
 518 tty3270_scroll_backward(struct kbd_data *kbd)
 519 {
 520         struct tty3270 *tp;
 521         int nr_up;
 522
 523         tp = kbd->tty->driver_data;
 524         spin_lock_bh(&tp->view.lock);
 525         nr_up = tp->nr_up + tp->view.rows - 2;
 526         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
 527                 nr_up = tp->nr_lines - tp->view.rows + 2;
 528         if (nr_up != tp->nr_up) {
 529                 tp->nr_up = nr_up;
 530                 tty3270_rebuild_update(tp);
 531                 tty3270_update_status(tp);
 532                 tty3270_set_timer(tp, 1);
 533         }
 534         spin_unlock_bh(&tp->view.lock);
 535 }
 536
 537 /*
 538  * Pass input line to tty.
 539  */
 540 static void
 541 tty3270_read_tasklet(struct raw3270_request *rrq)
 542 {
 543         static char kreset_data = TW_KR;
 544         struct tty3270 *tp;
 545         char *input;
 546         int len;
 547
 548         tp = (struct tty3270 *) rrq->view;
 549         spin_lock_bh(&tp->view.lock);
 550         /*
 551          * Two AID keys are special: For 0x7d (enter) the input line
 552          * has to be emitted to the tty and for 0x6d the screen
 553          * needs to be redrawn.
 554          */
 555         input = NULL;
 556         len = 0;
 557         if (tp->input->string[0] == 0x7d) {
 558                 /* Enter: write input to tty. */
 559                 input = tp->input->string + 6;
 560                 len = tp->input->len - 6 - rrq->rescnt;
 561                 if (tp->inattr != TF_INPUTN)
 562                         tty3270_rcl_add(tp, input, len);
 563                 if (tp->nr_up > 0) {
 564                         tp->nr_up = 0;
 565                         tty3270_rebuild_update(tp);
 566                         tty3270_update_status(tp);
 567                 }
 568                 /* Clear input area. */
 569                 tty3270_update_prompt(tp, NULL, 0);
 570                 tty3270_set_timer(tp, 1);
 571         } else if (tp->input->string[0] == 0x6d) {
 572                 /* Display has been cleared. Redraw. */
 573                 tty3270_rebuild_update(tp);
 574                 tp->update_flags = TTY_UPDATE_ALL;
 575                 tty3270_set_timer(tp, 1);
 576         }
 577         spin_unlock_bh(&tp->view.lock);
 578
 579         /* Start keyboard reset command. */
 580         raw3270_request_reset(tp->kreset);
 581         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
 582         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
 583         raw3270_start(&tp->view, tp->kreset);
 584
 585         /* Emit input string. */
 586         if (tp->tty) {
 587                 while (len-- > 0)
 588                         kbd_keycode(tp->kbd, *input++);
 589                 /* Emit keycode for AID byte. */
 590                 kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
 591         }
 592
 593         raw3270_request_reset(rrq);
 594         xchg(&tp->read, rrq);
 595         raw3270_put_view(&tp->view);
 596 }
 597
 598 /*
 599  * Read request completion callback.
 600  */
 601 static void
 602 tty3270_read_callback(struct raw3270_request *rq, void *data)
 603 {
 604         raw3270_get_view(rq->view);
 605         /* Schedule tasklet to pass input to tty. */
 606         tasklet_schedule(&((struct tty3270 *) rq->view)->readlet);
 607 }
 608
 609 /*
 610  * Issue a read request. Call with device lock.
 611  */
 612 static void
 613 tty3270_issue_read(struct tty3270 *tp, int lock)
 614 {
 615         struct raw3270_request *rrq;
 616         int rc;
 617
 618         rrq = xchg(&tp->read, 0);
 619         if (!rrq)
 620                 /* Read already scheduled. */
 621                 return;
 622         rrq->callback = tty3270_read_callback;
 623         rrq->callback_data = tp;
 624         raw3270_request_set_cmd(rrq, TC_READMOD);
 625         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
 626         /* Issue the read modified request. */
 627         if (lock) {
 628                 rc = raw3270_start(&tp->view, rrq);
 629         } else
 630                 rc = raw3270_start_irq(&tp->view, rrq);
 631         if (rc) {
 632                 raw3270_request_reset(rrq);
 633                 xchg(&tp->read, rrq);
 634         }
 635 }
 636
 637 /*
 638  * Switch to the tty view.
 639  */
 640 static int
 641 tty3270_activate(struct raw3270_view *view)
 642 {
 643         struct tty3270 *tp;
 644         unsigned long flags;
 645
 646         tp = (struct tty3270 *) view;
 647         spin_lock_irqsave(&tp->view.lock, flags);
 648         tp->nr_up = 0;
 649         tty3270_rebuild_update(tp);
 650         tty3270_update_status(tp);
 651         tp->update_flags = TTY_UPDATE_ALL;
 652         tty3270_set_timer(tp, 1);
 653         spin_unlock_irqrestore(&tp->view.lock, flags);
 654         return 0;
 655 }
 656
 657 static void
 658 tty3270_deactivate(struct raw3270_view *view)
 659 {
 660 }
 661
 662 static int
 663 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 664 {
 665         /* Handle ATTN. Schedule tasklet to read aid. */
 666         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 667                 if (!tp->throttle)
 668                         tty3270_issue_read(tp, 0);
 669                 else
 670                         tp->attn = 1;
 671         }
 672
 673         if (rq) {
 674                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 675                         rq->rc = -EIO;
 676                 else
 677                         /* Normal end. Copy residual count. */
 678                         rq->rescnt = irb->scsw.cmd.count;
 679         }
 680         return RAW3270_IO_DONE;
 681 }
 682
 683 /*
 684  * Allocate tty3270 structure.
 685  */
 686 static struct tty3270 *
 687 tty3270_alloc_view(void)
 688 {
 689         struct tty3270 *tp;
 690         int pages;
 691
 692         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
 693         if (!tp)
 694                 goto out_err;
 695         tp->freemem_pages =
 696                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 697         if (!tp->freemem_pages)
 698                 goto out_tp;
 699         INIT_LIST_HEAD(&tp->freemem);
 700         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 701                 tp->freemem_pages[pages] = (void *)
 702                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 703                 if (!tp->freemem_pages[pages])
 704                         goto out_pages;
 705                 add_string_memory(&tp->freemem,
 706                                   tp->freemem_pages[pages], PAGE_SIZE);
 707         }
 708         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 709         if (IS_ERR(tp->write))
 710                 goto out_pages;
 711         tp->read = raw3270_request_alloc(0);
 712         if (IS_ERR(tp->read))
 713                 goto out_write;
 714         tp->kreset = raw3270_request_alloc(1);
 715         if (IS_ERR(tp->kreset))
 716                 goto out_read;
 717         tp->kbd = kbd_alloc();
 718         if (!tp->kbd)
 719                 goto out_reset;
 720         return tp;
 721
 722 out_reset:
 723         raw3270_request_free(tp->kreset);
 724 out_read:
 725         raw3270_request_free(tp->read);
 726 out_write:
 727         raw3270_request_free(tp->write);
 728 out_pages:
 729         while (pages--)
 730                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 731         kfree(tp->freemem_pages);
 732 out_tp:
 733         kfree(tp);
 734 out_err:
 735         return ERR_PTR(-ENOMEM);
 736 }
 737
 738 /*
 739  * Free tty3270 structure.
 740  */
 741 static void
 742 tty3270_free_view(struct tty3270 *tp)
 743 {
 744         int pages;
 745
 746         kbd_free(tp->kbd);
 747         raw3270_request_free(tp->kreset);
 748         raw3270_request_free(tp->read);
 749         raw3270_request_free(tp->write);
 750         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 751                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 752         kfree(tp->freemem_pages);
 753         kfree(tp);
 754 }
 755
 756 /*
 757  * Allocate tty3270 screen.
 758  */
 759 static int
 760 tty3270_alloc_screen(struct tty3270 *tp)
 761 {
 762         unsigned long size;
 763         int lines;
 764
 765         size = sizeof(struct tty3270_line) * (tp->view.rows - 2);
 766         tp->screen = kzalloc(size, GFP_KERNEL);
 767         if (!tp->screen)
 768                 goto out_err;
 769         for (lines = 0; lines < tp->view.rows - 2; lines++) {
 770                 size = sizeof(struct tty3270_cell) * tp->view.cols;
 771                 tp->screen[lines].cells = kzalloc(size, GFP_KERNEL);
 772                 if (!tp->screen[lines].cells)
 773                         goto out_screen;
 774         }
 775         return 0;
 776 out_screen:
 777         while (lines--)
 778                 kfree(tp->screen[lines].cells);
 779         kfree(tp->screen);
 780 out_err:
 781         return -ENOMEM;
 782 }
 783
 784 /*
 785  * Free tty3270 screen.
 786  */
 787 static void
 788 tty3270_free_screen(struct tty3270 *tp)
 789 {
 790         int lines;
 791
 792         for (lines = 0; lines < tp->view.rows - 2; lines++)
 793                 kfree(tp->screen[lines].cells);
 794         kfree(tp->screen);
 795 }
 796
 797 /*
 798  * Unlink tty3270 data structure from tty.
 799  */
 800 static void
 801 tty3270_release(struct raw3270_view *view)
 802 {
 803         struct tty3270 *tp;
 804         struct tty_struct *tty;
 805
 806         tp = (struct tty3270 *) view;
 807         tty = tp->tty;
 808         if (tty) {
 809                 tty->driver_data = NULL;
 810                 tp->tty = tp->kbd->tty = NULL;
 811                 tty_hangup(tty);
 812                 raw3270_put_view(&tp->view);
 813         }
 814 }
 815
 816 /*
 817  * Free tty3270 data structure
 818  */
 819 static void
 820 tty3270_free(struct raw3270_view *view)
 821 {
 822         tty3270_free_screen((struct tty3270 *) view);
 823         tty3270_free_view((struct tty3270 *) view);
 824 }
 825
 826 /*
 827  * Delayed freeing of tty3270 views.
 828  */
 829 static void
 830 tty3270_del_views(void)
 831 {
 832         struct tty3270 *tp;
 833         int i;
 834
 835         for (i = 0; i < tty3270_max_index; i++) {
 836                 tp = (struct tty3270 *)
 837                         raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
 838                 if (!IS_ERR(tp))
 839                         raw3270_del_view(&tp->view);
 840         }
 841 }
 842
 843 static struct raw3270_fn tty3270_fn = {
 844         .activate = tty3270_activate,
 845         .deactivate = tty3270_deactivate,
 846         .intv = (void *) tty3270_irq,
 847         .release = tty3270_release,
 848         .free = tty3270_free
 849 };
 850
 851 /*
 852  * This routine is called whenever a 3270 tty is opened.
 853  */
 854 static int
 855 tty3270_open(struct tty_struct *tty, struct file * filp)
 856 {
 857         struct tty3270 *tp;
 858         int i, rc;
 859
 860         if (tty->count > 1)
 861                 return 0;
 862         /* Check if the tty3270 is already there. */
 863         tp = (struct tty3270 *)
 864                 raw3270_find_view(&tty3270_fn,
 865                                   tty->index + RAW3270_FIRSTMINOR);
 866         if (!IS_ERR(tp)) {
 867                 tty->driver_data = tp;
 868                 tty->winsize.ws_row = tp->view.rows - 2;
 869                 tty->winsize.ws_col = tp->view.cols;
 870                 tty->low_latency = 0;
 871                 tp->tty = tty;
 872                 tp->kbd->tty = tty;
 873                 tp->inattr = TF_INPUT;
 874                 return 0;
 875         }
 876         if (tty3270_max_index < tty->index + 1)
 877                 tty3270_max_index = tty->index + 1;
 878
 879         /* Quick exit if there is no device for tty->index. */
 880         if (PTR_ERR(tp) == -ENODEV)
 881                 return -ENODEV;
 882
 883         /* Allocate tty3270 structure on first open. */
 884         tp = tty3270_alloc_view();
 885         if (IS_ERR(tp))
 886                 return PTR_ERR(tp);
 887
 888         INIT_LIST_HEAD(&tp->lines);
 889         INIT_LIST_HEAD(&tp->update);
 890         INIT_LIST_HEAD(&tp->rcl_lines);
 891         tp->rcl_max = 20;
 892         init_timer(&tp->timer);
 893         tasklet_init(&tp->readlet,
 894                      (void (*)(unsigned long)) tty3270_read_tasklet,
 895                      (unsigned long) tp->read);
 896
 897         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 898                               tty->index + RAW3270_FIRSTMINOR);
 899         if (rc) {
 900                 tty3270_free_view(tp);
 901                 return rc;
 902         }
 903
 904         rc = tty3270_alloc_screen(tp);
 905         if (rc) {
 906                 raw3270_put_view(&tp->view);
 907                 raw3270_del_view(&tp->view);
 908                 return rc;
 909         }
 910
 911         tp->tty = tty;
 912         tty->low_latency = 0;
 913         tty->driver_data = tp;
 914         tty->winsize.ws_row = tp->view.rows - 2;
 915         tty->winsize.ws_col = tp->view.cols;
 916
 917         tty3270_create_prompt(tp);
 918         tty3270_create_status(tp);
 919         tty3270_update_status(tp);
 920
 921         /* Create blank line for every line in the tty output area. */
 922         for (i = 0; i < tp->view.rows - 2; i++)
 923                 tty3270_blank_line(tp);
 924
 925         tp->kbd->tty = tty;
 926         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
 927         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
 928         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
 929         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
 930         kbd_ascebc(tp->kbd, tp->view.ascebc);
 931
 932         raw3270_activate_view(&tp->view);
 933         return 0;
 934 }
 935
 936 /*
 937  * This routine is called when the 3270 tty is closed. We wait
 938  * for the remaining request to be completed. Then we clean up.
 939  */
 940 static void
 941 tty3270_close(struct tty_struct *tty, struct file * filp)
 942 {
 943         struct tty3270 *tp;
 944
 945         if (tty->count > 1)
 946                 return;
 947         tp = (struct tty3270 *) tty->driver_data;
 948         if (tp) {
 949                 tty->driver_data = NULL;
 950                 tp->tty = tp->kbd->tty = NULL;
 951                 raw3270_put_view(&tp->view);
 952         }
 953 }
 954
 955 /*
 956  * We always have room.
 957  */
 958 static int
 959 tty3270_write_room(struct tty_struct *tty)
 960 {
 961         return INT_MAX;
 962 }
 963
 964 /*
 965  * Insert character into the screen at the current position with the
 966  * current color and highlight. This function does NOT do cursor movement.
 967  */
 968 static void tty3270_put_character(struct tty3270 *tp, char ch)
 969 {
 970         struct tty3270_line *line;
 971         struct tty3270_cell *cell;
 972
 973         line = tp->screen + tp->cy;
 974         if (line->len <= tp->cx) {
 975                 while (line->len < tp->cx) {
 976                         cell = line->cells + line->len;
 977                         cell->character = tp->view.ascebc[' '];
 978                         cell->highlight = tp->highlight;
 979                         cell->f_color = tp->f_color;
 980                         line->len++;
 981                 }
 982                 line->len++;
 983         }
 984         cell = line->cells + tp->cx;
 985         cell->character = tp->view.ascebc[(unsigned int) ch];
 986         cell->highlight = tp->highlight;
 987         cell->f_color = tp->f_color;
 988 }
 989
 990 /*
 991  * Convert a tty3270_line to a 3270 data fragment usable for output.
 992  */
 993 static void
 994 tty3270_convert_line(struct tty3270 *tp, int line_nr)
 995 {
 996         struct tty3270_line *line;
 997         struct tty3270_cell *cell;
 998         struct string *s, *n;
 999         unsigned char highlight;
1000         unsigned char f_color;
1001         char *cp;
1002         int flen, i;
1003
1004         /* Determine how long the fragment will be. */
1005         flen = 3;               /* Prefix (TO_SBA). */
1006         line = tp->screen + line_nr;
1007         flen += line->len;
1008         highlight = TAX_RESET;
1009         f_color = TAC_RESET;
1010         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1011                 if (cell->highlight != highlight) {
1012                         flen += 3;      /* TO_SA to switch highlight. */
1013                         highlight = cell->highlight;
1014                 }
1015                 if (cell->f_color != f_color) {
1016                         flen += 3;      /* TO_SA to switch color. */
1017                         f_color = cell->f_color;
1018                 }
1019         }
1020         if (highlight != TAX_RESET)
1021                 flen += 3;      /* TO_SA to reset hightlight. */
1022         if (f_color != TAC_RESET)
1023                 flen += 3;      /* TO_SA to reset color. */
1024         if (line->len < tp->view.cols)
1025                 flen += 4;      /* Postfix (TO_RA). */
1026
1027         /* Find the line in the list. */
1028         i = tp->view.rows - 2 - line_nr;
1029         list_for_each_entry_reverse(s, &tp->lines, list)
1030                 if (--i <= 0)
1031                         break;
1032         /*
1033          * Check if the line needs to get reallocated.
1034          */
1035         if (s->len != flen) {
1036                 /* Reallocate string. */
1037                 n = tty3270_alloc_string(tp, flen);
1038                 list_add(&n->list, &s->list);
1039                 list_del_init(&s->list);
1040                 if (!list_empty(&s->update))
1041                         list_del_init(&s->update);
1042                 free_string(&tp->freemem, s);
1043                 s = n;
1044         }
1045
1046         /* Write 3270 data fragment. */
1047         cp = s->string;
1048         *cp++ = TO_SBA;
1049         *cp++ = 0;
1050         *cp++ = 0;
1051
1052         highlight = TAX_RESET;
1053         f_color = TAC_RESET;
1054         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1055                 if (cell->highlight != highlight) {
1056                         *cp++ = TO_SA;
1057                         *cp++ = TAT_EXTHI;
1058                         *cp++ = cell->highlight;
1059                         highlight = cell->highlight;
1060                 }
1061                 if (cell->f_color != f_color) {
1062                         *cp++ = TO_SA;
1063                         *cp++ = TAT_COLOR;
1064                         *cp++ = cell->f_color;
1065                         f_color = cell->f_color;
1066                 }
1067                 *cp++ = cell->character;
1068         }
1069         if (highlight != TAX_RESET) {
1070                 *cp++ = TO_SA;
1071                 *cp++ = TAT_EXTHI;
1072                 *cp++ = TAX_RESET;
1073         }
1074         if (f_color != TAC_RESET) {
1075                 *cp++ = TO_SA;
1076                 *cp++ = TAT_COLOR;
1077                 *cp++ = TAC_RESET;
1078         }
1079         if (line->len < tp->view.cols) {
1080                 *cp++ = TO_RA;
1081                 *cp++ = 0;
1082                 *cp++ = 0;
1083                 *cp++ = 0;
1084         }
1085
1086         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1087                 /* Line is currently visible on screen. */
1088                 tty3270_update_string(tp, s, line_nr);
1089                 /* Add line to update list. */
1090                 if (list_empty(&s->update)) {
1091                         list_add_tail(&s->update, &tp->update);
1092                         tp->update_flags |= TTY_UPDATE_LIST;
1093                 }
1094         }
1095 }
1096
1097 /*
1098  * Do carriage return.
1099  */
1100 static void
1101 tty3270_cr(struct tty3270 *tp)
1102 {
1103         tp->cx = 0;
1104 }
1105
1106 /*
1107  * Do line feed.
1108  */
1109 static void
1110 tty3270_lf(struct tty3270 *tp)
1111 {
1112         struct tty3270_line temp;
1113         int i;
1114
1115         tty3270_convert_line(tp, tp->cy);
1116         if (tp->cy < tp->view.rows - 3) {
1117                 tp->cy++;
1118                 return;
1119         }
1120         /* Last line just filled up. Add new, blank line. */
1121         tty3270_blank_line(tp);
1122         temp = tp->screen[0];
1123         temp.len = 0;
1124         for (i = 0; i < tp->view.rows - 3; i++)
1125                 tp->screen[i] = tp->screen[i+1];
1126         tp->screen[tp->view.rows - 3] = temp;
1127         tty3270_rebuild_update(tp);
1128 }
1129
1130 static void
1131 tty3270_ri(struct tty3270 *tp)
1132 {
1133         if (tp->cy > 0) {
1134             tty3270_convert_line(tp, tp->cy);
1135             tp->cy--;
1136         }
1137 }
1138
1139 /*
1140  * Insert characters at current position.
1141  */
1142 static void
1143 tty3270_insert_characters(struct tty3270 *tp, int n)
1144 {
1145         struct tty3270_line *line;
1146         int k;
1147
1148         line = tp->screen + tp->cy;
1149         while (line->len < tp->cx) {
1150                 line->cells[line->len].character = tp->view.ascebc[' '];
1151                 line->cells[line->len].highlight = TAX_RESET;
1152                 line->cells[line->len].f_color = TAC_RESET;
1153                 line->len++;
1154         }
1155         if (n > tp->view.cols - tp->cx)
1156                 n = tp->view.cols - tp->cx;
1157         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1158         while (k--)
1159                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1160         line->len += n;
1161         if (line->len > tp->view.cols)
1162                 line->len = tp->view.cols;
1163         while (n-- > 0) {
1164                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1165                 line->cells[tp->cx + n].highlight = tp->highlight;
1166                 line->cells[tp->cx + n].f_color = tp->f_color;
1167         }
1168 }
1169
1170 /*
1171  * Delete characters at current position.
1172  */
1173 static void
1174 tty3270_delete_characters(struct tty3270 *tp, int n)
1175 {
1176         struct tty3270_line *line;
1177         int i;
1178
1179         line = tp->screen + tp->cy;
1180         if (line->len <= tp->cx)
1181                 return;
1182         if (line->len - tp->cx <= n) {
1183                 line->len = tp->cx;
1184                 return;
1185         }
1186         for (i = tp->cx; i + n < line->len; i++)
1187                 line->cells[i] = line->cells[i + n];
1188         line->len -= n;
1189 }
1190
1191 /*
1192  * Erase characters at current position.
1193  */
1194 static void
1195 tty3270_erase_characters(struct tty3270 *tp, int n)
1196 {
1197         struct tty3270_line *line;
1198         struct tty3270_cell *cell;
1199
1200         line = tp->screen + tp->cy;
1201         while (line->len > tp->cx && n-- > 0) {
1202                 cell = line->cells + tp->cx++;
1203                 cell->character = ' ';
1204                 cell->highlight = TAX_RESET;
1205                 cell->f_color = TAC_RESET;
1206         }
1207         tp->cx += n;
1208         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1209 }
1210
1211 /*
1212  * Erase line, 3 different cases:
1213  *  Esc [ 0 K   Erase from current position to end of line inclusive
1214  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1215  *  Esc [ 2 K   Erase entire line (without moving cursor)
1216  */
1217 static void
1218 tty3270_erase_line(struct tty3270 *tp, int mode)
1219 {
1220         struct tty3270_line *line;
1221         struct tty3270_cell *cell;
1222         int i;
1223
1224         line = tp->screen + tp->cy;
1225         if (mode == 0)
1226                 line->len = tp->cx;
1227         else if (mode == 1) {
1228                 for (i = 0; i < tp->cx; i++) {
1229                         cell = line->cells + i;
1230                         cell->character = ' ';
1231                         cell->highlight = TAX_RESET;
1232                         cell->f_color = TAC_RESET;
1233                 }
1234                 if (line->len <= tp->cx)
1235                         line->len = tp->cx + 1;
1236         } else if (mode == 2)
1237                 line->len = 0;
1238         tty3270_convert_line(tp, tp->cy);
1239 }
1240
1241 /*
1242  * Erase display, 3 different cases:
1243  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1244  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1245  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1246  */
1247 static void
1248 tty3270_erase_display(struct tty3270 *tp, int mode)
1249 {
1250         int i;
1251
1252         if (mode == 0) {
1253                 tty3270_erase_line(tp, 0);
1254                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1255                         tp->screen[i].len = 0;
1256                         tty3270_convert_line(tp, i);
1257                 }
1258         } else if (mode == 1) {
1259                 for (i = 0; i < tp->cy; i++) {
1260                         tp->screen[i].len = 0;
1261                         tty3270_convert_line(tp, i);
1262                 }
1263                 tty3270_erase_line(tp, 1);
1264         } else if (mode == 2) {
1265                 for (i = 0; i < tp->view.rows - 2; i++) {
1266                         tp->screen[i].len = 0;
1267                         tty3270_convert_line(tp, i);
1268                 }
1269         }
1270         tty3270_rebuild_update(tp);
1271 }
1272
1273 /*
1274  * Set attributes found in an escape sequence.
1275  *  Esc [ <attr> ; <attr> ; ... m
1276  */
1277 static void
1278 tty3270_set_attributes(struct tty3270 *tp)
1279 {
1280         static unsigned char f_colors[] = {
1281                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1282                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1283         };
1284         int i, attr;
1285
1286         for (i = 0; i <= tp->esc_npar; i++) {
1287                 attr = tp->esc_par[i];
1288                 switch (attr) {
1289                 case 0:         /* Reset */
1290                         tp->highlight = TAX_RESET;
1291                         tp->f_color = TAC_RESET;
1292                         break;
1293                 /* Highlight. */
1294                 case 4:         /* Start underlining. */
1295                         tp->highlight = TAX_UNDER;
1296                         break;
1297                 case 5:         /* Start blink. */
1298                         tp->highlight = TAX_BLINK;
1299                         break;
1300                 case 7:         /* Start reverse. */
1301                         tp->highlight = TAX_REVER;
1302                         break;
1303                 case 24:        /* End underlining */
1304                         if (tp->highlight == TAX_UNDER)
1305                                 tp->highlight = TAX_RESET;
1306                         break;
1307                 case 25:        /* End blink. */
1308                         if (tp->highlight == TAX_BLINK)
1309                                 tp->highlight = TAX_RESET;
1310                         break;
1311                 case 27:        /* End reverse. */
1312                         if (tp->highlight == TAX_REVER)
1313                                 tp->highlight = TAX_RESET;
1314                         break;
1315                 /* Foreground color. */
1316                 case 30:        /* Black */
1317                 case 31:        /* Red */
1318                 case 32:        /* Green */
1319                 case 33:        /* Yellow */
1320                 case 34:        /* Blue */
1321                 case 35:        /* Magenta */
1322                 case 36:        /* Cyan */
1323                 case 37:        /* White */
1324                 case 39:        /* Black */
1325                         tp->f_color = f_colors[attr - 30];
1326                         break;
1327                 }
1328         }
1329 }
1330
1331 static inline int
1332 tty3270_getpar(struct tty3270 *tp, int ix)
1333 {
1334         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1335 }
1336
1337 static void
1338 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1339 {
1340         int max_cx = max(0, cx);
1341         int max_cy = max(0, cy);
1342
1343         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1344         cy = min_t(int, tp->view.rows - 3, max_cy);
1345         if (cy != tp->cy) {
1346                 tty3270_convert_line(tp, tp->cy);
1347                 tp->cy = cy;
1348         }
1349 }
1350
1351 /*
1352  * Process escape sequences. Known sequences:
1353  *  Esc 7                       Save Cursor Position
1354  *  Esc 8                       Restore Cursor Position
1355  *  Esc [ Pn ; Pn ; .. m        Set attributes
1356  *  Esc [ Pn ; Pn H             Cursor Position
1357  *  Esc [ Pn ; Pn f             Cursor Position
1358  *  Esc [ Pn A                  Cursor Up
1359  *  Esc [ Pn B                  Cursor Down
1360  *  Esc [ Pn C                  Cursor Forward
1361  *  Esc [ Pn D                  Cursor Backward
1362  *  Esc [ Pn G                  Cursor Horizontal Absolute
1363  *  Esc [ Pn X                  Erase Characters
1364  *  Esc [ Ps J                  Erase in Display
1365  *  Esc [ Ps K                  Erase in Line
1366  * // FIXME: add all the new ones.
1367  *
1368  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1369  *  Ps is a selective parameter.
1370  */
1371 static void
1372 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1373 {
1374         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1375
1376         if (tp->esc_state == ESnormal) {
1377                 if (ch == 0x1b)
1378                         /* Starting new escape sequence. */
1379                         tp->esc_state = ESesc;
1380                 return;
1381         }
1382         if (tp->esc_state == ESesc) {
1383                 tp->esc_state = ESnormal;
1384                 switch (ch) {
1385                 case '[':
1386                         tp->esc_state = ESsquare;
1387                         break;
1388                 case 'E':
1389                         tty3270_cr(tp);
1390                         tty3270_lf(tp);
1391                         break;
1392                 case 'M':
1393                         tty3270_ri(tp);
1394                         break;
1395                 case 'D':
1396                         tty3270_lf(tp);
1397                         break;
1398                 case 'Z':               /* Respond ID. */
1399                         kbd_puts_queue(tp->tty, "\033[?6c");
1400                         break;
1401                 case '7':               /* Save cursor position. */
1402                         tp->saved_cx = tp->cx;
1403                         tp->saved_cy = tp->cy;
1404                         tp->saved_highlight = tp->highlight;
1405                         tp->saved_f_color = tp->f_color;
1406                         break;
1407                 case '8':               /* Restore cursor position. */
1408                         tty3270_convert_line(tp, tp->cy);
1409                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1410                         tp->highlight = tp->saved_highlight;
1411                         tp->f_color = tp->saved_f_color;
1412                         break;
1413                 case 'c':               /* Reset terminal. */
1414                         tp->cx = tp->saved_cx = 0;
1415                         tp->cy = tp->saved_cy = 0;
1416                         tp->highlight = tp->saved_highlight = TAX_RESET;
1417                         tp->f_color = tp->saved_f_color = TAC_RESET;
1418                         tty3270_erase_display(tp, 2);
1419                         break;
1420                 }
1421                 return;
1422         }
1423         if (tp->esc_state == ESsquare) {
1424                 tp->esc_state = ESgetpars;
1425                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1426                 tp->esc_npar = 0;
1427                 tp->esc_ques = (ch == '?');
1428                 if (tp->esc_ques)
1429                         return;
1430         }
1431         if (tp->esc_state == ESgetpars) {
1432                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1433                         tp->esc_npar++;
1434                         return;
1435                 }
1436                 if (ch >= '0' && ch <= '9') {
1437                         tp->esc_par[tp->esc_npar] *= 10;
1438                         tp->esc_par[tp->esc_npar] += ch - '0';
1439                         return;
1440                 }
1441         }
1442         tp->esc_state = ESnormal;
1443         if (ch == 'n' && !tp->esc_ques) {
1444                 if (tp->esc_par[0] == 5)                /* Status report. */
1445                         kbd_puts_queue(tp->tty, "\033[0n");
1446                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1447                         char buf[40];
1448                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1449                         kbd_puts_queue(tp->tty, buf);
1450                 }
1451                 return;
1452         }
1453         if (tp->esc_ques)
1454                 return;
1455         switch (ch) {
1456         case 'm':
1457                 tty3270_set_attributes(tp);
1458                 break;
1459         case 'H':       /* Set cursor position. */
1460         case 'f':
1461                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1462                                 tty3270_getpar(tp, 0) - 1);
1463                 break;
1464         case 'd':       /* Set y position. */
1465                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1466                 break;
1467         case 'A':       /* Cursor up. */
1468         case 'F':
1469                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1470                 break;
1471         case 'B':       /* Cursor down. */
1472         case 'e':
1473         case 'E':
1474                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1475                 break;
1476         case 'C':       /* Cursor forward. */
1477         case 'a':
1478                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1479                 break;
1480         case 'D':       /* Cursor backward. */
1481                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1482                 break;
1483         case 'G':       /* Set x position. */
1484         case '`':
1485                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1486                 break;
1487         case 'X':       /* Erase Characters. */
1488                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1489                 break;
1490         case 'J':       /* Erase display. */
1491                 tty3270_erase_display(tp, tp->esc_par[0]);
1492                 break;
1493         case 'K':       /* Erase line. */
1494                 tty3270_erase_line(tp, tp->esc_par[0]);
1495                 break;
1496         case 'P':       /* Delete characters. */
1497                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1498                 break;
1499         case '@':       /* Insert characters. */
1500                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1501                 break;
1502         case 's':       /* Save cursor position. */
1503                 tp->saved_cx = tp->cx;
1504                 tp->saved_cy = tp->cy;
1505                 tp->saved_highlight = tp->highlight;
1506                 tp->saved_f_color = tp->f_color;
1507                 break;
1508         case 'u':       /* Restore cursor position. */
1509                 tty3270_convert_line(tp, tp->cy);
1510                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1511                 tp->highlight = tp->saved_highlight;
1512                 tp->f_color = tp->saved_f_color;
1513                 break;
1514         }
1515 }
1516
1517 /*
1518  * String write routine for 3270 ttys
1519  */
1520 static void
1521 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1522 {
1523         int i_msg, i;
1524
1525         spin_lock_bh(&tp->view.lock);
1526         for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1527                 if (tp->esc_state != 0) {
1528                         /* Continue escape sequence. */
1529                         tty3270_escape_sequence(tp, buf[i_msg]);
1530                         continue;
1531                 }
1532
1533                 switch (buf[i_msg]) {
1534                 case 0x07:              /* '\a' -- Alarm */
1535                         tp->wcc |= TW_PLUSALARM;
1536                         break;
1537                 case 0x08:              /* Backspace. */
1538                         if (tp->cx > 0) {
1539                                 tp->cx--;
1540                                 tty3270_put_character(tp, ' ');
1541                         }
1542                         break;
1543                 case 0x09:              /* '\t' -- Tabulate */
1544                         for (i = tp->cx % 8; i < 8; i++) {
1545                                 if (tp->cx >= tp->view.cols) {
1546                                         tty3270_cr(tp);
1547                                         tty3270_lf(tp);
1548                                         break;
1549                                 }
1550                                 tty3270_put_character(tp, ' ');
1551                                 tp->cx++;
1552                         }
1553                         break;
1554                 case 0x0a:              /* '\n' -- New Line */
1555                         tty3270_cr(tp);
1556                         tty3270_lf(tp);
1557                         break;
1558                 case 0x0c:              /* '\f' -- Form Feed */
1559                         tty3270_erase_display(tp, 2);
1560                         tp->cx = tp->cy = 0;
1561                         break;
1562                 case 0x0d:              /* '\r' -- Carriage Return */
1563                         tp->cx = 0;
1564                         break;
1565                 case 0x0f:              /* SuSE "exit alternate mode" */
1566                         break;
1567                 case 0x1b:              /* Start escape sequence. */
1568                         tty3270_escape_sequence(tp, buf[i_msg]);
1569                         break;
1570                 default:                /* Insert normal character. */
1571                         if (tp->cx >= tp->view.cols) {
1572                                 tty3270_cr(tp);
1573                                 tty3270_lf(tp);
1574                         }
1575                         tty3270_put_character(tp, buf[i_msg]);
1576                         tp->cx++;
1577                         break;
1578                 }
1579         }
1580         /* Convert current line to 3270 data fragment. */
1581         tty3270_convert_line(tp, tp->cy);
1582
1583         /* Setup timer to update display after 1/10 second */
1584         if (!timer_pending(&tp->timer))
1585                 tty3270_set_timer(tp, HZ/10);
1586
1587         spin_unlock_bh(&tp->view.lock);
1588 }
1589
1590 /*
1591  * String write routine for 3270 ttys
1592  */
1593 static int
1594 tty3270_write(struct tty_struct * tty,
1595               const unsigned char *buf, int count)
1596 {
1597         struct tty3270 *tp;
1598
1599         tp = tty->driver_data;
1600         if (!tp)
1601                 return 0;
1602         if (tp->char_count > 0) {
1603                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1604                 tp->char_count = 0;
1605         }
1606         tty3270_do_write(tp, buf, count);
1607         return count;
1608 }
1609
1610 /*
1611  * Put single characters to the ttys character buffer
1612  */
1613 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1614 {
1615         struct tty3270 *tp;
1616
1617         tp = tty->driver_data;
1618         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1619                 return 0;
1620         tp->char_buf[tp->char_count++] = ch;
1621         return 1;
1622 }
1623
1624 /*
1625  * Flush all characters from the ttys characeter buffer put there
1626  * by tty3270_put_char.
1627  */
1628 static void
1629 tty3270_flush_chars(struct tty_struct *tty)
1630 {
1631         struct tty3270 *tp;
1632
1633         tp = tty->driver_data;
1634         if (!tp)
1635                 return;
1636         if (tp->char_count > 0) {
1637                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1638                 tp->char_count = 0;
1639         }
1640 }
1641
1642 /*
1643  * Returns the number of characters in the output buffer. This is
1644  * used in tty_wait_until_sent to wait until all characters have
1645  * appeared on the screen.
1646  */
1647 static int
1648 tty3270_chars_in_buffer(struct tty_struct *tty)
1649 {
1650         return 0;
1651 }
1652
1653 static void
1654 tty3270_flush_buffer(struct tty_struct *tty)
1655 {
1656 }
1657
1658 /*
1659  * Check for visible/invisible input switches
1660  */
1661 static void
1662 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1663 {
1664         struct tty3270 *tp;
1665         int new;
1666
1667         tp = tty->driver_data;
1668         if (!tp)
1669                 return;
1670         spin_lock_bh(&tp->view.lock);
1671         if (L_ICANON(tty)) {
1672                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1673                 if (new != tp->inattr) {
1674                         tp->inattr = new;
1675                         tty3270_update_prompt(tp, NULL, 0);
1676                         tty3270_set_timer(tp, 1);
1677                 }
1678         }
1679         spin_unlock_bh(&tp->view.lock);
1680 }
1681
1682 /*
1683  * Disable reading from a 3270 tty
1684  */
1685 static void
1686 tty3270_throttle(struct tty_struct * tty)
1687 {
1688         struct tty3270 *tp;
1689
1690         tp = tty->driver_data;
1691         if (!tp)
1692                 return;
1693         tp->throttle = 1;
1694 }
1695
1696 /*
1697  * Enable reading from a 3270 tty
1698  */
1699 static void
1700 tty3270_unthrottle(struct tty_struct * tty)
1701 {
1702         struct tty3270 *tp;
1703
1704         tp = tty->driver_data;
1705         if (!tp)
1706                 return;
1707         tp->throttle = 0;
1708         if (tp->attn)
1709                 tty3270_issue_read(tp, 1);
1710 }
1711
1712 /*
1713  * Hang up the tty device.
1714  */
1715 static void
1716 tty3270_hangup(struct tty_struct *tty)
1717 {
1718         // FIXME: implement
1719 }
1720
1721 static void
1722 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1723 {
1724 }
1725
1726 static int
1727 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1728               unsigned int cmd, unsigned long arg)
1729 {
1730         struct tty3270 *tp;
1731
1732         tp = tty->driver_data;
1733         if (!tp)
1734                 return -ENODEV;
1735         if (tty->flags & (1 << TTY_IO_ERROR))
1736                 return -EIO;
1737         return kbd_ioctl(tp->kbd, file, cmd, arg);
1738 }
1739
1740 static const struct tty_operations tty3270_ops = {
1741         .open = tty3270_open,
1742         .close = tty3270_close,
1743         .write = tty3270_write,
1744         .put_char = tty3270_put_char,
1745         .flush_chars = tty3270_flush_chars,
1746         .write_room = tty3270_write_room,
1747         .chars_in_buffer = tty3270_chars_in_buffer,
1748         .flush_buffer = tty3270_flush_buffer,
1749         .throttle = tty3270_throttle,
1750         .unthrottle = tty3270_unthrottle,
1751         .hangup = tty3270_hangup,
1752         .wait_until_sent = tty3270_wait_until_sent,
1753         .ioctl = tty3270_ioctl,
1754         .set_termios = tty3270_set_termios
1755 };
1756
1757 static void tty3270_notifier(int index, int active)
1758 {
1759         if (active)
1760                 tty_register_device(tty3270_driver, index, NULL);
1761         else
1762                 tty_unregister_device(tty3270_driver, index);
1763 }
1764
1765 /*
1766  * 3270 tty registration code called from tty_init().
1767  * Most kernel services (incl. kmalloc) are available at this poimt.
1768  */
1769 static int __init tty3270_init(void)
1770 {
1771         struct tty_driver *driver;
1772         int ret;
1773
1774         driver = alloc_tty_driver(RAW3270_MAXDEVS);
1775         if (!driver)
1776                 return -ENOMEM;
1777
1778         /*
1779          * Initialize the tty_driver structure
1780          * Entries in tty3270_driver that are NOT initialized:
1781          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1782          */
1783         driver->owner = THIS_MODULE;
1784         driver->driver_name = "ttyTUB";
1785         driver->name = "ttyTUB";
1786         driver->major = IBM_TTY3270_MAJOR;
1787         driver->minor_start = RAW3270_FIRSTMINOR;
1788         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1789         driver->subtype = SYSTEM_TYPE_TTY;
1790         driver->init_termios = tty_std_termios;
1791         driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV;
1792         tty_set_operations(driver, &tty3270_ops);
1793         ret = tty_register_driver(driver);
1794         if (ret) {
1795                 put_tty_driver(driver);
1796                 return ret;
1797         }
1798         tty3270_driver = driver;
1799         ret = raw3270_register_notifier(tty3270_notifier);
1800         if (ret) {
1801                 put_tty_driver(driver);
1802                 return ret;
1803
1804         }
1805         return 0;
1806 }
1807
1808 static void __exit
1809 tty3270_exit(void)
1810 {
1811         struct tty_driver *driver;
1812
1813         raw3270_unregister_notifier(tty3270_notifier);
1814         driver = tty3270_driver;
1815         tty3270_driver = NULL;
1816         tty_unregister_driver(driver);
1817         tty3270_del_views();
1818 }
1819
1820 MODULE_LICENSE("GPL");
1821 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1822
1823 module_init(tty3270_init);
1824 module_exit(tty3270_exit);