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/config.h>
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kdev_t.h>
  15 #include <linux/tty.h>
  16 #include <linux/vt_kern.h>
  17 #include <linux/init.h>
  18 #include <linux/console.h>
  19 #include <linux/interrupt.h>
  20
  21 #include <linux/slab.h>
  22 #include <linux/bootmem.h>
  23
  24 #include <asm/ccwdev.h>
  25 #include <asm/cio.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/uaccess.h>
  28
  29
  30 #include "raw3270.h"
  31 #include "keyboard.h"
  32
  33 #define TTY3270_CHAR_BUF_SIZE 256
  34 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
  35 #define TTY3270_STRING_PAGES 5
  36
  37 struct tty_driver *tty3270_driver;
  38
  39 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 void
 123 tty3270_set_timer(struct tty3270 *tp, int expires)
 124 {
 125         if (expires == 0) {
 126                 if (timer_pending(&tp->timer)) {
 127                         raw3270_put_view(&tp->view);
 128                         del_timer(&tp->timer);
 129                 }
 130                 return;
 131         }
 132         if (timer_pending(&tp->timer)) {
 133                 if (mod_timer(&tp->timer, jiffies + expires))
 134                         return;
 135         }
 136         raw3270_get_view(&tp->view);
 137         tp->timer.function = (void (*)(unsigned long)) tty3270_update;
 138         tp->timer.data = (unsigned long) tp;
 139         tp->timer.expires = jiffies + expires;
 140         add_timer(&tp->timer);
 141 }
 142
 143 /*
 144  * The input line are the two last lines of the screen.
 145  */
 146 static void
 147 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
 148 {
 149         struct string *line;
 150         unsigned int off;
 151
 152         line = tp->prompt;
 153         if (count != 0)
 154                 line->string[5] = TF_INMDT;
 155         else
 156                 line->string[5] = tp->inattr;
 157         if (count > tp->view.cols * 2 - 11)
 158                 count = tp->view.cols * 2 - 11;
 159         memcpy(line->string + 6, input, count);
 160         line->string[6 + count] = TO_IC;
 161         /* Clear to end of input line. */
 162         if (count < tp->view.cols * 2 - 11) {
 163                 line->string[7 + count] = TO_RA;
 164                 line->string[10 + count] = 0;
 165                 off = tp->view.cols * tp->view.rows - 9;
 166                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
 167                 line->len = 11 + count;
 168         } else
 169                 line->len = 7 + count;
 170         tp->update_flags |= TTY_UPDATE_INPUT;
 171 }
 172
 173 static void
 174 tty3270_create_prompt(struct tty3270 *tp)
 175 {
 176         static const unsigned char blueprint[] =
 177                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
 178                   /* empty input string */
 179                   TO_IC, TO_RA, 0, 0, 0 };
 180         struct string *line;
 181         unsigned int offset;
 182
 183         line = alloc_string(&tp->freemem,
 184                             sizeof(blueprint) + tp->view.cols * 2 - 9);
 185         tp->prompt = line;
 186         tp->inattr = TF_INPUT;
 187         /* Copy blueprint to status line */
 188         memcpy(line->string, blueprint, sizeof(blueprint));
 189         line->len = sizeof(blueprint);
 190         /* Set output offsets. */
 191         offset = tp->view.cols * (tp->view.rows - 2);
 192         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 193         offset = tp->view.cols * tp->view.rows - 9;
 194         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
 195
 196         /* Allocate input string for reading. */
 197         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
 198 }
 199
 200 /*
 201  * The status line is the last line of the screen. It shows the string
 202  * "Running"/"Holding" in the lower right corner of the screen.
 203  */
 204 static void
 205 tty3270_update_status(struct tty3270 * tp)
 206 {
 207         char *str;
 208
 209         str = (tp->nr_up != 0) ? "History" : "Running";
 210         memcpy(tp->status->string + 8, str, 7);
 211         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 212         tp->update_flags |= TTY_UPDATE_STATUS;
 213 }
 214
 215 static void
 216 tty3270_create_status(struct tty3270 * tp)
 217 {
 218         static const unsigned char blueprint[] =
 219                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
 220                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
 221                   TAC_RESET };
 222         struct string *line;
 223         unsigned int offset;
 224
 225         line = alloc_string(&tp->freemem,sizeof(blueprint));
 226         tp->status = line;
 227         /* Copy blueprint to status line */
 228         memcpy(line->string, blueprint, sizeof(blueprint));
 229         /* Set address to start of status string (= last 9 characters). */
 230         offset = tp->view.cols * tp->view.rows - 9;
 231         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 232 }
 233
 234 /*
 235  * Set output offsets to 3270 datastream fragment of a tty string.
 236  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
 237  */
 238 static void
 239 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
 240 {
 241         unsigned char *cp;
 242
 243         raw3270_buffer_address(tp->view.dev, line->string + 1,
 244                                tp->view.cols * nr);
 245         cp = line->string + line->len - 4;
 246         if (*cp == TO_RA)
 247                 raw3270_buffer_address(tp->view.dev, cp + 1,
 248                                        tp->view.cols * (nr + 1));
 249 }
 250
 251 /*
 252  * Rebuild update list to print all lines.
 253  */
 254 static void
 255 tty3270_rebuild_update(struct tty3270 *tp)
 256 {
 257         struct string *s, *n;
 258         int line, nr_up;
 259
 260         /*
 261          * Throw away update list and create a new one,
 262          * containing all lines that will fit on the screen.
 263          */
 264         list_for_each_entry_safe(s, n, &tp->update, update)
 265                 list_del_init(&s->update);
 266         line = tp->view.rows - 3;
 267         nr_up = tp->nr_up;
 268         list_for_each_entry_reverse(s, &tp->lines, list) {
 269                 if (nr_up > 0) {
 270                         nr_up--;
 271                         continue;
 272                 }
 273                 tty3270_update_string(tp, s, line);
 274                 list_add(&s->update, &tp->update);
 275                 if (--line < 0)
 276                         break;
 277         }
 278         tp->update_flags |= TTY_UPDATE_LIST;
 279 }
 280
 281 /*
 282  * Alloc string for size bytes. If there is not enough room in
 283  * freemem, free strings until there is room.
 284  */
 285 static struct string *
 286 tty3270_alloc_string(struct tty3270 *tp, size_t size)
 287 {
 288         struct string *s, *n;
 289
 290         s = alloc_string(&tp->freemem, size);
 291         if (s)
 292                 return s;
 293         list_for_each_entry_safe(s, n, &tp->lines, list) {
 294                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
 295                 list_del(&s->list);
 296                 if (!list_empty(&s->update))
 297                         list_del(&s->update);
 298                 tp->nr_lines--;
 299                 if (free_string(&tp->freemem, s) >= size)
 300                         break;
 301         }
 302         s = alloc_string(&tp->freemem, size);
 303         BUG_ON(!s);
 304         if (tp->nr_up != 0 &&
 305             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
 306                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
 307                 tty3270_rebuild_update(tp);
 308                 tty3270_update_status(tp);
 309         }
 310         return s;
 311 }
 312
 313 /*
 314  * Add an empty line to the list.
 315  */
 316 static void
 317 tty3270_blank_line(struct tty3270 *tp)
 318 {
 319         static const unsigned char blueprint[] =
 320                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
 321                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
 322         struct string *s;
 323
 324         s = tty3270_alloc_string(tp, sizeof(blueprint));
 325         memcpy(s->string, blueprint, sizeof(blueprint));
 326         s->len = sizeof(blueprint);
 327         list_add_tail(&s->list, &tp->lines);
 328         tp->nr_lines++;
 329         if (tp->nr_up != 0)
 330                 tp->nr_up++;
 331 }
 332
 333 /*
 334  * Write request completion callback.
 335  */
 336 static void
 337 tty3270_write_callback(struct raw3270_request *rq, void *data)
 338 {
 339         struct tty3270 *tp;
 340
 341         tp = (struct tty3270 *) rq->view;
 342         if (rq->rc != 0) {
 343                 /* Write wasn't successfull. Refresh all. */
 344                 tty3270_rebuild_update(tp);
 345                 tp->update_flags = TTY_UPDATE_ALL;
 346                 tty3270_set_timer(tp, 1);
 347         }
 348         raw3270_request_reset(rq);
 349         xchg(&tp->write, rq);
 350 }
 351
 352 /*
 353  * Update 3270 display.
 354  */
 355 static void
 356 tty3270_update(struct tty3270 *tp)
 357 {
 358         static char invalid_sba[2] = { 0xff, 0xff };
 359         struct raw3270_request *wrq;
 360         unsigned long updated;
 361         struct string *s, *n;
 362         char *sba, *str;
 363         int rc, len;
 364
 365         wrq = xchg(&tp->write, 0);
 366         if (!wrq) {
 367                 tty3270_set_timer(tp, 1);
 368                 return;
 369         }
 370
 371         spin_lock(&tp->view.lock);
 372         updated = 0;
 373         if (tp->update_flags & TTY_UPDATE_ERASE) {
 374                 /* Use erase write alternate to erase display. */
 375                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 376                 updated |= TTY_UPDATE_ERASE;
 377         } else
 378                 raw3270_request_set_cmd(wrq, TC_WRITE);
 379
 380         raw3270_request_add_data(wrq, &tp->wcc, 1);
 381         tp->wcc = TW_NONE;
 382
 383         /*
 384          * Update status line.
 385          */
 386         if (tp->update_flags & TTY_UPDATE_STATUS)
 387                 if (raw3270_request_add_data(wrq, tp->status->string,
 388                                              tp->status->len) == 0)
 389                         updated |= TTY_UPDATE_STATUS;
 390
 391         /*
 392          * Write input line.
 393          */
 394         if (tp->update_flags & TTY_UPDATE_INPUT)
 395                 if (raw3270_request_add_data(wrq, tp->prompt->string,
 396                                              tp->prompt->len) == 0)
 397                         updated |= TTY_UPDATE_INPUT;
 398
 399         sba = invalid_sba;
 400
 401         if (tp->update_flags & TTY_UPDATE_LIST) {
 402                 /* Write strings in the update list to the screen. */
 403                 list_for_each_entry_safe(s, n, &tp->update, update) {
 404                         str = s->string;
 405                         len = s->len;
 406                         /*
 407                          * Skip TO_SBA at the start of the string if the
 408                          * last output position matches the start address
 409                          * of this line.
 410                          */
 411                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
 412                                 str += 3, len -= 3;
 413                         if (raw3270_request_add_data(wrq, str, len) != 0)
 414                                 break;
 415                         list_del_init(&s->update);
 416                         sba = s->string + s->len - 3;
 417                 }
 418                 if (list_empty(&tp->update))
 419                         updated |= TTY_UPDATE_LIST;
 420         }
 421         wrq->callback = tty3270_write_callback;
 422         rc = raw3270_start(&tp->view, wrq);
 423         if (rc == 0) {
 424                 tp->update_flags &= ~updated;
 425                 if (tp->update_flags)
 426                         tty3270_set_timer(tp, 1);
 427         } else {
 428                 raw3270_request_reset(wrq);
 429                 xchg(&tp->write, wrq);
 430         }
 431         spin_unlock(&tp->view.lock);
 432         raw3270_put_view(&tp->view);
 433 }
 434
 435 /*
 436  * Command recalling.
 437  */
 438 static void
 439 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
 440 {
 441         struct string *s;
 442
 443         tp->rcl_walk = 0;
 444         if (len <= 0)
 445                 return;
 446         if (tp->rcl_nr >= tp->rcl_max) {
 447                 s = list_entry(tp->rcl_lines.next, struct string, list);
 448                 list_del(&s->list);
 449                 free_string(&tp->freemem, s);
 450                 tp->rcl_nr--;
 451         }
 452         s = tty3270_alloc_string(tp, len);
 453         memcpy(s->string, input, len);
 454         list_add_tail(&s->list, &tp->rcl_lines);
 455         tp->rcl_nr++;
 456 }
 457
 458 static void
 459 tty3270_rcl_backward(struct kbd_data *kbd)
 460 {
 461         struct tty3270 *tp;
 462         struct string *s;
 463
 464         tp = kbd->tty->driver_data;
 465         spin_lock_bh(&tp->view.lock);
 466         if (tp->inattr == TF_INPUT) {
 467                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
 468                         tp->rcl_walk = tp->rcl_walk->prev;
 469                 else if (!list_empty(&tp->rcl_lines))
 470                         tp->rcl_walk = tp->rcl_lines.prev;
 471                 s = tp->rcl_walk ?
 472                         list_entry(tp->rcl_walk, struct string, list) : 0;
 473                 if (tp->rcl_walk) {
 474                         s = list_entry(tp->rcl_walk, struct string, list);
 475                         tty3270_update_prompt(tp, s->string, s->len);
 476                 } else
 477                         tty3270_update_prompt(tp, 0, 0);
 478                 tty3270_set_timer(tp, 1);
 479         }
 480         spin_unlock_bh(&tp->view.lock);
 481 }
 482
 483 /*
 484  * Deactivate tty view.
 485  */
 486 static void
 487 tty3270_exit_tty(struct kbd_data *kbd)
 488 {
 489         struct tty3270 *tp;
 490
 491         tp = kbd->tty->driver_data;
 492         raw3270_deactivate_view(&tp->view);
 493 }
 494
 495 /*
 496  * Scroll forward in history.
 497  */
 498 static void
 499 tty3270_scroll_forward(struct kbd_data *kbd)
 500 {
 501         struct tty3270 *tp;
 502         int nr_up;
 503
 504         tp = kbd->tty->driver_data;
 505         spin_lock_bh(&tp->view.lock);
 506         nr_up = tp->nr_up - tp->view.rows + 2;
 507         if (nr_up < 0)
 508                 nr_up = 0;
 509         if (nr_up != tp->nr_up) {
 510                 tp->nr_up = nr_up;
 511                 tty3270_rebuild_update(tp);
 512                 tty3270_update_status(tp);
 513                 tty3270_set_timer(tp, 1);
 514         }
 515         spin_unlock_bh(&tp->view.lock);
 516 }
 517
 518 /*
 519  * Scroll backward in history.
 520  */
 521 static void
 522 tty3270_scroll_backward(struct kbd_data *kbd)
 523 {
 524         struct tty3270 *tp;
 525         int nr_up;
 526
 527         tp = kbd->tty->driver_data;
 528         spin_lock_bh(&tp->view.lock);
 529         nr_up = tp->nr_up + tp->view.rows - 2;
 530         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
 531                 nr_up = tp->nr_lines - tp->view.rows + 2;
 532         if (nr_up != tp->nr_up) {
 533                 tp->nr_up = nr_up;
 534                 tty3270_rebuild_update(tp);
 535                 tty3270_update_status(tp);
 536                 tty3270_set_timer(tp, 1);
 537         }
 538         spin_unlock_bh(&tp->view.lock);
 539 }
 540
 541 /*
 542  * Pass input line to tty.
 543  */
 544 static void
 545 tty3270_read_tasklet(struct raw3270_request *rrq)
 546 {
 547         static char kreset_data = TW_KR;
 548         struct tty3270 *tp;
 549         char *input;
 550         int len;
 551
 552         tp = (struct tty3270 *) rrq->view;
 553         spin_lock_bh(&tp->view.lock);
 554         /*
 555          * Two AID keys are special: For 0x7d (enter) the input line
 556          * has to be emitted to the tty and for 0x6d the screen
 557          * needs to be redrawn.
 558          */
 559         input = 0;
 560         len = 0;
 561         if (tp->input->string[0] == 0x7d) {
 562                 /* Enter: write input to tty. */
 563                 input = tp->input->string + 6;
 564                 len = tp->input->len - 6 - rrq->rescnt;
 565                 if (tp->inattr != TF_INPUTN)
 566                         tty3270_rcl_add(tp, input, len);
 567                 if (tp->nr_up > 0) {
 568                         tp->nr_up = 0;
 569                         tty3270_rebuild_update(tp);
 570                         tty3270_update_status(tp);
 571                 }
 572                 /* Clear input area. */
 573                 tty3270_update_prompt(tp, 0, 0);
 574                 tty3270_set_timer(tp, 1);
 575         } else if (tp->input->string[0] == 0x6d) {
 576                 /* Display has been cleared. Redraw. */
 577                 tty3270_rebuild_update(tp);
 578                 tp->update_flags = TTY_UPDATE_ALL;
 579                 tty3270_set_timer(tp, 1);
 580         }
 581         spin_unlock_bh(&tp->view.lock);
 582
 583         /* Start keyboard reset command. */
 584         raw3270_request_reset(tp->kreset);
 585         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
 586         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
 587         raw3270_start(&tp->view, tp->kreset);
 588
 589         /* Emit input string. */
 590         if (tp->tty) {
 591                 while (len-- > 0)
 592                         kbd_keycode(tp->kbd, *input++);
 593                 /* Emit keycode for AID byte. */
 594                 kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
 595         }
 596
 597         raw3270_request_reset(rrq);
 598         xchg(&tp->read, rrq);
 599         raw3270_put_view(&tp->view);
 600 }
 601
 602 /*
 603  * Read request completion callback.
 604  */
 605 static void
 606 tty3270_read_callback(struct raw3270_request *rq, void *data)
 607 {
 608         raw3270_get_view(rq->view);
 609         /* Schedule tasklet to pass input to tty. */
 610         tasklet_schedule(&((struct tty3270 *) rq->view)->readlet);
 611 }
 612
 613 /*
 614  * Issue a read request. Call with device lock.
 615  */
 616 static void
 617 tty3270_issue_read(struct tty3270 *tp, int lock)
 618 {
 619         struct raw3270_request *rrq;
 620         int rc;
 621
 622         rrq = xchg(&tp->read, 0);
 623         if (!rrq)
 624                 /* Read already scheduled. */
 625                 return;
 626         rrq->callback = tty3270_read_callback;
 627         rrq->callback_data = tp;
 628         raw3270_request_set_cmd(rrq, TC_READMOD);
 629         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
 630         /* Issue the read modified request. */
 631         if (lock) {
 632                 rc = raw3270_start(&tp->view, rrq);
 633         } else
 634                 rc = raw3270_start_irq(&tp->view, rrq);
 635         if (rc) {
 636                 raw3270_request_reset(rrq);
 637                 xchg(&tp->read, rrq);
 638         }
 639 }
 640
 641 /*
 642  * Switch to the tty view.
 643  */
 644 static int
 645 tty3270_activate(struct raw3270_view *view)
 646 {
 647         struct tty3270 *tp;
 648         unsigned long flags;
 649
 650         tp = (struct tty3270 *) view;
 651         spin_lock_irqsave(&tp->view.lock, flags);
 652         tp->nr_up = 0;
 653         tty3270_rebuild_update(tp);
 654         tty3270_update_status(tp);
 655         tp->update_flags = TTY_UPDATE_ALL;
 656         tty3270_set_timer(tp, 1);
 657         spin_unlock_irqrestore(&tp->view.lock, flags);
 658         start_tty(tp->tty);
 659         return 0;
 660 }
 661
 662 static void
 663 tty3270_deactivate(struct raw3270_view *view)
 664 {
 665         struct tty3270 *tp;
 666
 667         tp = (struct tty3270 *) view;
 668         if (tp && tp->tty)
 669                 stop_tty(tp->tty);
 670 }
 671
 672 static int
 673 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 674 {
 675         /* Handle ATTN. Schedule tasklet to read aid. */
 676         if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
 677                 if (!tp->throttle)
 678                         tty3270_issue_read(tp, 0);
 679                 else
 680                         tp->attn = 1;
 681         }
 682
 683         if (rq) {
 684                 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
 685                         rq->rc = -EIO;
 686                 else
 687                         /* Normal end. Copy residual count. */
 688                         rq->rescnt = irb->scsw.count;
 689         }
 690         return RAW3270_IO_DONE;
 691 }
 692
 693 /*
 694  * Allocate tty3270 structure.
 695  */
 696 static struct tty3270 *
 697 tty3270_alloc_view(void)
 698 {
 699         struct tty3270 *tp;
 700         int pages;
 701
 702         tp = kmalloc(sizeof(struct tty3270),GFP_KERNEL);
 703         if (!tp)
 704                 goto out_err;
 705         memset(tp, 0, sizeof(struct tty3270));
 706         tp->freemem_pages =
 707                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 708         if (!tp->freemem_pages)
 709                 goto out_tp;
 710         INIT_LIST_HEAD(&tp->freemem);
 711         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 712                 tp->freemem_pages[pages] = (void *)
 713                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 714                 if (!tp->freemem_pages[pages])
 715                         goto out_pages;
 716                 add_string_memory(&tp->freemem,
 717                                   tp->freemem_pages[pages], PAGE_SIZE);
 718         }
 719         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 720         if (!tp->write)
 721                 goto out_pages;
 722         tp->read = raw3270_request_alloc(0);
 723         if (!tp->read)
 724                 goto out_write;
 725         tp->kreset = raw3270_request_alloc(1);
 726         if (!tp->kreset)
 727                 goto out_read;
 728         tp->kbd = kbd_alloc();
 729         if (!tp->kbd)
 730                 goto out_reset;
 731         return tp;
 732
 733 out_reset:
 734         raw3270_request_free(tp->kreset);
 735 out_read:
 736         raw3270_request_free(tp->read);
 737 out_write:
 738         raw3270_request_free(tp->write);
 739 out_pages:
 740         while (pages--)
 741                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 742         kfree(tp->freemem_pages);
 743 out_tp:
 744         kfree(tp);
 745 out_err:
 746         return ERR_PTR(-ENOMEM);
 747 }
 748
 749 /*
 750  * Free tty3270 structure.
 751  */
 752 static void
 753 tty3270_free_view(struct tty3270 *tp)
 754 {
 755         int pages;
 756
 757         kbd_free(tp->kbd);
 758         raw3270_request_free(tp->kreset);
 759         raw3270_request_free(tp->read);
 760         raw3270_request_free(tp->write);
 761         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 762                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 763         kfree(tp->freemem_pages);
 764         kfree(tp);
 765 }
 766
 767 /*
 768  * Allocate tty3270 screen.
 769  */
 770 static int
 771 tty3270_alloc_screen(struct tty3270 *tp)
 772 {
 773         unsigned long size;
 774         int lines;
 775
 776         size = sizeof(struct tty3270_line) * (tp->view.rows - 2);
 777         tp->screen = kmalloc(size, GFP_KERNEL);
 778         if (!tp->screen)
 779                 goto out_err;
 780         memset(tp->screen, 0, size);
 781         for (lines = 0; lines < tp->view.rows - 2; lines++) {
 782                 size = sizeof(struct tty3270_cell) * tp->view.cols;
 783                 tp->screen[lines].cells = kmalloc(size, GFP_KERNEL);
 784                 if (!tp->screen[lines].cells)
 785                         goto out_screen;
 786                 memset(tp->screen[lines].cells, 0, size);
 787         }
 788         return 0;
 789 out_screen:
 790         while (lines--)
 791                 kfree(tp->screen[lines].cells);
 792         kfree(tp->screen);
 793 out_err:
 794         return -ENOMEM;
 795 }
 796
 797 /*
 798  * Free tty3270 screen.
 799  */
 800 static void
 801 tty3270_free_screen(struct tty3270 *tp)
 802 {
 803         int lines;
 804
 805         for (lines = 0; lines < tp->view.rows - 2; lines++)
 806                 kfree(tp->screen[lines].cells);
 807         kfree(tp->screen);
 808 }
 809
 810 /*
 811  * Unlink tty3270 data structure from tty.
 812  */
 813 static void
 814 tty3270_release(struct raw3270_view *view)
 815 {
 816         struct tty3270 *tp;
 817         struct tty_struct *tty;
 818
 819         tp = (struct tty3270 *) view;
 820         tty = tp->tty;
 821         if (tty) {
 822                 tty->driver_data = 0;
 823                 tp->tty = tp->kbd->tty = 0;
 824                 tty_hangup(tty);
 825                 raw3270_put_view(&tp->view);
 826         }
 827 }
 828
 829 /*
 830  * Free tty3270 data structure
 831  */
 832 static void
 833 tty3270_free(struct raw3270_view *view)
 834 {
 835         tty3270_free_screen((struct tty3270 *) view);
 836         tty3270_free_view((struct tty3270 *) view);
 837 }
 838
 839 struct raw3270_fn tty3270_fn = {
 840         .activate = tty3270_activate,
 841         .deactivate = tty3270_deactivate,
 842         .intv = (void *) tty3270_irq,
 843         .release = tty3270_release,
 844         .free = tty3270_free
 845 };
 846
 847 /*
 848  * This routine is called whenever a 3270 tty is opened.
 849  */
 850 static int
 851 tty3270_open(struct tty_struct *tty, struct file * filp)
 852 {
 853         struct tty3270 *tp;
 854         int i, rc;
 855
 856         if (tty->count > 1)
 857                 return 0;
 858         /* Check if the tty3270 is already there. */
 859         tp = (struct tty3270 *) raw3270_find_view(&tty3270_fn, tty->index);
 860         if (!IS_ERR(tp)) {
 861                 tty->driver_data = tp;
 862                 tty->winsize.ws_row = tp->view.rows - 2;
 863                 tty->winsize.ws_col = tp->view.cols;
 864                 tty->low_latency = 0;
 865                 tp->tty = tty;
 866                 tp->kbd->tty = tty;
 867                 tp->inattr = TF_INPUT;
 868                 return 0;
 869         }
 870
 871         /* Allocate tty3270 structure on first open. */
 872         tp = tty3270_alloc_view();
 873         if (IS_ERR(tp))
 874                 return PTR_ERR(tp);
 875
 876         INIT_LIST_HEAD(&tp->lines);
 877         INIT_LIST_HEAD(&tp->update);
 878         INIT_LIST_HEAD(&tp->rcl_lines);
 879         tp->rcl_max = 20;
 880         init_timer(&tp->timer);
 881         tasklet_init(&tp->readlet,
 882                      (void (*)(unsigned long)) tty3270_read_tasklet,
 883                      (unsigned long) tp->read);
 884
 885         rc = raw3270_add_view(&tp->view, &tty3270_fn, tty->index);
 886         if (rc) {
 887                 tty3270_free_view(tp);
 888                 return rc;
 889         }
 890
 891         rc = tty3270_alloc_screen(tp);
 892         if (rc) {
 893                 raw3270_del_view(&tp->view);
 894                 raw3270_put_view(&tp->view);
 895                 return rc;
 896         }
 897
 898         tp->tty = tty;
 899         tty->low_latency = 0;
 900         tty->driver_data = tp;
 901         tty->winsize.ws_row = tp->view.rows - 2;
 902         tty->winsize.ws_col = tp->view.cols;
 903
 904         tty3270_create_prompt(tp);
 905         tty3270_create_status(tp);
 906         tty3270_update_status(tp);
 907
 908         /* Create blank line for every line in the tty output area. */
 909         for (i = 0; i < tp->view.rows - 2; i++)
 910                 tty3270_blank_line(tp);
 911
 912         tp->kbd->tty = tty;
 913         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
 914         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
 915         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
 916         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
 917         kbd_ascebc(tp->kbd, tp->view.ascebc);
 918
 919         raw3270_activate_view(&tp->view);
 920         return 0;
 921 }
 922
 923 /*
 924  * This routine is called when the 3270 tty is closed. We wait
 925  * for the remaining request to be completed. Then we clean up.
 926  */
 927 static void
 928 tty3270_close(struct tty_struct *tty, struct file * filp)
 929 {
 930         struct tty3270 *tp;
 931
 932         if (tty->count > 1)
 933                 return;
 934         tp = (struct tty3270 *) tty->driver_data;
 935         if (tp) {
 936                 tty->driver_data = 0;
 937                 tp->tty = tp->kbd->tty = 0;
 938                 raw3270_put_view(&tp->view);
 939         }
 940 }
 941
 942 /*
 943  * We always have room.
 944  */
 945 static int
 946 tty3270_write_room(struct tty_struct *tty)
 947 {
 948         return INT_MAX;
 949 }
 950
 951 /*
 952  * Insert character into the screen at the current position with the
 953  * current color and highlight. This function does NOT do cursor movement.
 954  */
 955 static void
 956 tty3270_put_character(struct tty3270 *tp, char ch)
 957 {
 958         struct tty3270_line *line;
 959         struct tty3270_cell *cell;
 960
 961         line = tp->screen + tp->cy;
 962         if (line->len <= tp->cx) {
 963                 while (line->len < tp->cx) {
 964                         cell = line->cells + line->len;
 965                         cell->character = tp->view.ascebc[' '];
 966                         cell->highlight = tp->highlight;
 967                         cell->f_color = tp->f_color;
 968                         line->len++;
 969                 }
 970                 line->len++;
 971         }
 972         cell = line->cells + tp->cx;
 973         cell->character = tp->view.ascebc[(unsigned int) ch];
 974         cell->highlight = tp->highlight;
 975         cell->f_color = tp->f_color;
 976 }
 977
 978 /*
 979  * Convert a tty3270_line to a 3270 data fragment usable for output.
 980  */
 981 static void
 982 tty3270_convert_line(struct tty3270 *tp, int line_nr)
 983 {
 984         struct tty3270_line *line;
 985         struct tty3270_cell *cell;
 986         struct string *s, *n;
 987         unsigned char highlight;
 988         unsigned char f_color;
 989         char *cp;
 990         int flen, i;
 991
 992         /* Determine how long the fragment will be. */
 993         flen = 3;               /* Prefix (TO_SBA). */
 994         line = tp->screen + line_nr;
 995         flen += line->len;
 996         highlight = TAX_RESET;
 997         f_color = TAC_RESET;
 998         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
 999                 if (cell->highlight != highlight) {
1000                         flen += 3;      /* TO_SA to switch highlight. */
1001                         highlight = cell->highlight;
1002                 }
1003                 if (cell->f_color != f_color) {
1004                         flen += 3;      /* TO_SA to switch color. */
1005                         f_color = cell->f_color;
1006                 }
1007         }
1008         if (highlight != TAX_RESET)
1009                 flen += 3;      /* TO_SA to reset hightlight. */
1010         if (f_color != TAC_RESET)
1011                 flen += 3;      /* TO_SA to reset color. */
1012         if (line->len < tp->view.cols)
1013                 flen += 4;      /* Postfix (TO_RA). */
1014
1015         /* Find the line in the list. */
1016         i = tp->view.rows - 2 - line_nr;
1017         list_for_each_entry_reverse(s, &tp->lines, list)
1018                 if (--i <= 0)
1019                         break;
1020         /*
1021          * Check if the line needs to get reallocated.
1022          */
1023         if (s->len != flen) {
1024                 /* Reallocate string. */
1025                 n = tty3270_alloc_string(tp, flen);
1026                 list_add(&n->list, &s->list);
1027                 list_del_init(&s->list);
1028                 if (!list_empty(&s->update))
1029                         list_del_init(&s->update);
1030                 free_string(&tp->freemem, s);
1031                 s = n;
1032         }
1033
1034         /* Write 3270 data fragment. */
1035         cp = s->string;
1036         *cp++ = TO_SBA;
1037         *cp++ = 0;
1038         *cp++ = 0;
1039
1040         highlight = TAX_RESET;
1041         f_color = TAC_RESET;
1042         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1043                 if (cell->highlight != highlight) {
1044                         *cp++ = TO_SA;
1045                         *cp++ = TAT_EXTHI;
1046                         *cp++ = cell->highlight;
1047                         highlight = cell->highlight;
1048                 }
1049                 if (cell->f_color != f_color) {
1050                         *cp++ = TO_SA;
1051                         *cp++ = TAT_COLOR;
1052                         *cp++ = cell->f_color;
1053                         f_color = cell->f_color;
1054                 }
1055                 *cp++ = cell->character;
1056         }
1057         if (highlight != TAX_RESET) {
1058                 *cp++ = TO_SA;
1059                 *cp++ = TAT_EXTHI;
1060                 *cp++ = TAX_RESET;
1061         }
1062         if (f_color != TAC_RESET) {
1063                 *cp++ = TO_SA;
1064                 *cp++ = TAT_COLOR;
1065                 *cp++ = TAC_RESET;
1066         }
1067         if (line->len < tp->view.cols) {
1068                 *cp++ = TO_RA;
1069                 *cp++ = 0;
1070                 *cp++ = 0;
1071                 *cp++ = 0;
1072         }
1073
1074         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1075                 /* Line is currently visible on screen. */
1076                 tty3270_update_string(tp, s, line_nr);
1077                 /* Add line to update list. */
1078                 if (list_empty(&s->update)) {
1079                         list_add_tail(&s->update, &tp->update);
1080                         tp->update_flags |= TTY_UPDATE_LIST;
1081                 }
1082         }
1083 }
1084
1085 /*
1086  * Do carriage return.
1087  */
1088 static void
1089 tty3270_cr(struct tty3270 *tp)
1090 {
1091         tp->cx = 0;
1092 }
1093
1094 /*
1095  * Do line feed.
1096  */
1097 static void
1098 tty3270_lf(struct tty3270 *tp)
1099 {
1100         struct tty3270_line temp;
1101         int i;
1102
1103         tty3270_convert_line(tp, tp->cy);
1104         if (tp->cy < tp->view.rows - 3) {
1105                 tp->cy++;
1106                 return;
1107         }
1108         /* Last line just filled up. Add new, blank line. */
1109         tty3270_blank_line(tp);
1110         temp = tp->screen[0];
1111         temp.len = 0;
1112         for (i = 0; i < tp->view.rows - 3; i++)
1113                 tp->screen[i] = tp->screen[i+1];
1114         tp->screen[tp->view.rows - 3] = temp;
1115         tty3270_rebuild_update(tp);
1116 }
1117
1118 static void
1119 tty3270_ri(struct tty3270 *tp)
1120 {
1121         if (tp->cy > 0) {
1122             tty3270_convert_line(tp, tp->cy);
1123             tp->cy--;
1124         }
1125 }
1126
1127 /*
1128  * Insert characters at current position.
1129  */
1130 static void
1131 tty3270_insert_characters(struct tty3270 *tp, int n)
1132 {
1133         struct tty3270_line *line;
1134         int k;
1135
1136         line = tp->screen + tp->cy;
1137         while (line->len < tp->cx) {
1138                 line->cells[line->len].character = tp->view.ascebc[' '];
1139                 line->cells[line->len].highlight = TAX_RESET;
1140                 line->cells[line->len].f_color = TAC_RESET;
1141                 line->len++;
1142         }
1143         if (n > tp->view.cols - tp->cx)
1144                 n = tp->view.cols - tp->cx;
1145         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1146         while (k--)
1147                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1148         line->len += n;
1149         if (line->len > tp->view.cols)
1150                 line->len = tp->view.cols;
1151         while (n-- > 0) {
1152                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1153                 line->cells[tp->cx + n].highlight = tp->highlight;
1154                 line->cells[tp->cx + n].f_color = tp->f_color;
1155         }
1156 }
1157
1158 /*
1159  * Delete characters at current position.
1160  */
1161 static void
1162 tty3270_delete_characters(struct tty3270 *tp, int n)
1163 {
1164         struct tty3270_line *line;
1165         int i;
1166
1167         line = tp->screen + tp->cy;
1168         if (line->len <= tp->cx)
1169                 return;
1170         if (line->len - tp->cx <= n) {
1171                 line->len = tp->cx;
1172                 return;
1173         }
1174         for (i = tp->cx; i + n < line->len; i++)
1175                 line->cells[i] = line->cells[i + n];
1176         line->len -= n;
1177 }
1178
1179 /*
1180  * Erase characters at current position.
1181  */
1182 static void
1183 tty3270_erase_characters(struct tty3270 *tp, int n)
1184 {
1185         struct tty3270_line *line;
1186         struct tty3270_cell *cell;
1187
1188         line = tp->screen + tp->cy;
1189         while (line->len > tp->cx && n-- > 0) {
1190                 cell = line->cells + tp->cx++;
1191                 cell->character = ' ';
1192                 cell->highlight = TAX_RESET;
1193                 cell->f_color = TAC_RESET;
1194         }
1195         tp->cx += n;
1196         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1197 }
1198
1199 /*
1200  * Erase line, 3 different cases:
1201  *  Esc [ 0 K   Erase from current position to end of line inclusive
1202  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1203  *  Esc [ 2 K   Erase entire line (without moving cursor)
1204  */
1205 static void
1206 tty3270_erase_line(struct tty3270 *tp, int mode)
1207 {
1208         struct tty3270_line *line;
1209         struct tty3270_cell *cell;
1210         int i;
1211
1212         line = tp->screen + tp->cy;
1213         if (mode == 0)
1214                 line->len = tp->cx;
1215         else if (mode == 1) {
1216                 for (i = 0; i < tp->cx; i++) {
1217                         cell = line->cells + i;
1218                         cell->character = ' ';
1219                         cell->highlight = TAX_RESET;
1220                         cell->f_color = TAC_RESET;
1221                 }
1222                 if (line->len <= tp->cx)
1223                         line->len = tp->cx + 1;
1224         } else if (mode == 2)
1225                 line->len = 0;
1226         tty3270_convert_line(tp, tp->cy);
1227 }
1228
1229 /*
1230  * Erase display, 3 different cases:
1231  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1232  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1233  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1234  */
1235 static void
1236 tty3270_erase_display(struct tty3270 *tp, int mode)
1237 {
1238         int i;
1239
1240         if (mode == 0) {
1241                 tty3270_erase_line(tp, 0);
1242                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1243                         tp->screen[i].len = 0;
1244                         tty3270_convert_line(tp, i);
1245                 }
1246         } else if (mode == 1) {
1247                 for (i = 0; i < tp->cy; i++) {
1248                         tp->screen[i].len = 0;
1249                         tty3270_convert_line(tp, i);
1250                 }
1251                 tty3270_erase_line(tp, 1);
1252         } else if (mode == 2) {
1253                 for (i = 0; i < tp->view.rows - 2; i++) {
1254                         tp->screen[i].len = 0;
1255                         tty3270_convert_line(tp, i);
1256                 }
1257         }
1258         tty3270_rebuild_update(tp);
1259 }
1260
1261 /*
1262  * Set attributes found in an escape sequence.
1263  *  Esc [ <attr> ; <attr> ; ... m
1264  */
1265 static void
1266 tty3270_set_attributes(struct tty3270 *tp)
1267 {
1268         static unsigned char f_colors[] = {
1269                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1270                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1271         };
1272         int i, attr;
1273
1274         for (i = 0; i <= tp->esc_npar; i++) {
1275                 attr = tp->esc_par[i];
1276                 switch (attr) {
1277                 case 0:         /* Reset */
1278                         tp->highlight = TAX_RESET;
1279                         tp->f_color = TAC_RESET;
1280                         break;
1281                 /* Highlight. */
1282                 case 4:         /* Start underlining. */
1283                         tp->highlight = TAX_UNDER;
1284                         break;
1285                 case 5:         /* Start blink. */
1286                         tp->highlight = TAX_BLINK;
1287                         break;
1288                 case 7:         /* Start reverse. */
1289                         tp->highlight = TAX_REVER;
1290                         break;
1291                 case 24:        /* End underlining */
1292                         if (tp->highlight == TAX_UNDER)
1293                                 tp->highlight = TAX_RESET;
1294                         break;
1295                 case 25:        /* End blink. */
1296                         if (tp->highlight == TAX_BLINK)
1297                                 tp->highlight = TAX_RESET;
1298                         break;
1299                 case 27:        /* End reverse. */
1300                         if (tp->highlight == TAX_REVER)
1301                                 tp->highlight = TAX_RESET;
1302                         break;
1303                 /* Foreground color. */
1304                 case 30:        /* Black */
1305                 case 31:        /* Red */
1306                 case 32:        /* Green */
1307                 case 33:        /* Yellow */
1308                 case 34:        /* Blue */
1309                 case 35:        /* Magenta */
1310                 case 36:        /* Cyan */
1311                 case 37:        /* White */
1312                 case 39:        /* Black */
1313                         tp->f_color = f_colors[attr - 30];
1314                         break;
1315                 }
1316         }
1317 }
1318
1319 static inline int
1320 tty3270_getpar(struct tty3270 *tp, int ix)
1321 {
1322         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1323 }
1324
1325 static void
1326 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1327 {
1328         tp->cx = min_t(int, tp->view.cols - 1, max_t(int, 0, cx));
1329         cy = min_t(int, tp->view.rows - 3, max_t(int, 0, cy));
1330         if (cy != tp->cy) {
1331                 tty3270_convert_line(tp, tp->cy);
1332                 tp->cy = cy;
1333         }
1334 }
1335
1336 /*
1337  * Process escape sequences. Known sequences:
1338  *  Esc 7                       Save Cursor Position
1339  *  Esc 8                       Restore Cursor Position
1340  *  Esc [ Pn ; Pn ; .. m        Set attributes
1341  *  Esc [ Pn ; Pn H             Cursor Position
1342  *  Esc [ Pn ; Pn f             Cursor Position
1343  *  Esc [ Pn A                  Cursor Up
1344  *  Esc [ Pn B                  Cursor Down
1345  *  Esc [ Pn C                  Cursor Forward
1346  *  Esc [ Pn D                  Cursor Backward
1347  *  Esc [ Pn G                  Cursor Horizontal Absolute
1348  *  Esc [ Pn X                  Erase Characters
1349  *  Esc [ Ps J                  Erase in Display
1350  *  Esc [ Ps K                  Erase in Line
1351  * // FIXME: add all the new ones.
1352  *
1353  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1354  *  Ps is a selective parameter.
1355  */
1356 static void
1357 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1358 {
1359         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1360
1361         if (tp->esc_state == ESnormal) {
1362                 if (ch == 0x1b)
1363                         /* Starting new escape sequence. */
1364                         tp->esc_state = ESesc;
1365                 return;
1366         }
1367         if (tp->esc_state == ESesc) {
1368                 tp->esc_state = ESnormal;
1369                 switch (ch) {
1370                 case '[':
1371                         tp->esc_state = ESsquare;
1372                         break;
1373                 case 'E':
1374                         tty3270_cr(tp);
1375                         tty3270_lf(tp);
1376                         break;
1377                 case 'M':
1378                         tty3270_ri(tp);
1379                         break;
1380                 case 'D':
1381                         tty3270_lf(tp);
1382                         break;
1383                 case 'Z':               /* Respond ID. */
1384                         kbd_puts_queue(tp->tty, "\033[?6c");
1385                         break;
1386                 case '7':               /* Save cursor position. */
1387                         tp->saved_cx = tp->cx;
1388                         tp->saved_cy = tp->cy;
1389                         tp->saved_highlight = tp->highlight;
1390                         tp->saved_f_color = tp->f_color;
1391                         break;
1392                 case '8':               /* Restore cursor position. */
1393                         tty3270_convert_line(tp, tp->cy);
1394                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1395                         tp->highlight = tp->saved_highlight;
1396                         tp->f_color = tp->saved_f_color;
1397                         break;
1398                 case 'c':               /* Reset terminal. */
1399                         tp->cx = tp->saved_cx = 0;
1400                         tp->cy = tp->saved_cy = 0;
1401                         tp->highlight = tp->saved_highlight = TAX_RESET;
1402                         tp->f_color = tp->saved_f_color = TAC_RESET;
1403                         tty3270_erase_display(tp, 2);
1404                         break;
1405                 }
1406                 return;
1407         }
1408         if (tp->esc_state == ESsquare) {
1409                 tp->esc_state = ESgetpars;
1410                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1411                 tp->esc_npar = 0;
1412                 tp->esc_ques = (ch == '?');
1413                 if (tp->esc_ques)
1414                         return;
1415         }
1416         if (tp->esc_state == ESgetpars) {
1417                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1418                         tp->esc_npar++;
1419                         return;
1420                 }
1421                 if (ch >= '0' && ch <= '9') {
1422                         tp->esc_par[tp->esc_npar] *= 10;
1423                         tp->esc_par[tp->esc_npar] += ch - '0';
1424                         return;
1425                 }
1426         }
1427         tp->esc_state = ESnormal;
1428         if (ch == 'n' && !tp->esc_ques) {
1429                 if (tp->esc_par[0] == 5)                /* Status report. */
1430                         kbd_puts_queue(tp->tty, "\033[0n");
1431                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1432                         char buf[40];
1433                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1434                         kbd_puts_queue(tp->tty, buf);
1435                 }
1436                 return;
1437         }
1438         if (tp->esc_ques)
1439                 return;
1440         switch (ch) {
1441         case 'm':
1442                 tty3270_set_attributes(tp);
1443                 break;
1444         case 'H':       /* Set cursor position. */
1445         case 'f':
1446                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1447                                 tty3270_getpar(tp, 0) - 1);
1448                 break;
1449         case 'd':       /* Set y position. */
1450                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1451                 break;
1452         case 'A':       /* Cursor up. */
1453         case 'F':
1454                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1455                 break;
1456         case 'B':       /* Cursor down. */
1457         case 'e':
1458         case 'E':
1459                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1460                 break;
1461         case 'C':       /* Cursor forward. */
1462         case 'a':
1463                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1464                 break;
1465         case 'D':       /* Cursor backward. */
1466                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1467                 break;
1468         case 'G':       /* Set x position. */
1469         case '`':
1470                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1471                 break;
1472         case 'X':       /* Erase Characters. */
1473                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1474                 break;
1475         case 'J':       /* Erase display. */
1476                 tty3270_erase_display(tp, tp->esc_par[0]);
1477                 break;
1478         case 'K':       /* Erase line. */
1479                 tty3270_erase_line(tp, tp->esc_par[0]);
1480                 break;
1481         case 'P':       /* Delete characters. */
1482                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1483                 break;
1484         case '@':       /* Insert characters. */
1485                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1486                 break;
1487         case 's':       /* Save cursor position. */
1488                 tp->saved_cx = tp->cx;
1489                 tp->saved_cy = tp->cy;
1490                 tp->saved_highlight = tp->highlight;
1491                 tp->saved_f_color = tp->f_color;
1492                 break;
1493         case 'u':       /* Restore cursor position. */
1494                 tty3270_convert_line(tp, tp->cy);
1495                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1496                 tp->highlight = tp->saved_highlight;
1497                 tp->f_color = tp->saved_f_color;
1498                 break;
1499         }
1500 }
1501
1502 /*
1503  * String write routine for 3270 ttys
1504  */
1505 static void
1506 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1507 {
1508         int i_msg, i;
1509
1510         spin_lock_bh(&tp->view.lock);
1511         for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1512                 if (tp->esc_state != 0) {
1513                         /* Continue escape sequence. */
1514                         tty3270_escape_sequence(tp, buf[i_msg]);
1515                         continue;
1516                 }
1517
1518                 switch (buf[i_msg]) {
1519                 case 0x07:              /* '\a' -- Alarm */
1520                         tp->wcc |= TW_PLUSALARM;
1521                         break;
1522                 case 0x08:              /* Backspace. */
1523                         if (tp->cx > 0) {
1524                                 tp->cx--;
1525                                 tty3270_put_character(tp, ' ');
1526                         }
1527                         break;
1528                 case 0x09:              /* '\t' -- Tabulate */
1529                         for (i = tp->cx % 8; i < 8; i++) {
1530                                 if (tp->cx >= tp->view.cols) {
1531                                         tty3270_cr(tp);
1532                                         tty3270_lf(tp);
1533                                         break;
1534                                 }
1535                                 tty3270_put_character(tp, ' ');
1536                                 tp->cx++;
1537                         }
1538                         break;
1539                 case 0x0a:              /* '\n' -- New Line */
1540                         tty3270_cr(tp);
1541                         tty3270_lf(tp);
1542                         break;
1543                 case 0x0c:              /* '\f' -- Form Feed */
1544                         tty3270_erase_display(tp, 2);
1545                         tp->cx = tp->cy = 0;
1546                         break;
1547                 case 0x0d:              /* '\r' -- Carriage Return */
1548                         tp->cx = 0;
1549                         break;
1550                 case 0x0f:              /* SuSE "exit alternate mode" */
1551                         break;
1552                 case 0x1b:              /* Start escape sequence. */
1553                         tty3270_escape_sequence(tp, buf[i_msg]);
1554                         break;
1555                 default:                /* Insert normal character. */
1556                         if (tp->cx >= tp->view.cols) {
1557                                 tty3270_cr(tp);
1558                                 tty3270_lf(tp);
1559                         }
1560                         tty3270_put_character(tp, buf[i_msg]);
1561                         tp->cx++;
1562                         break;
1563                 }
1564         }
1565         /* Convert current line to 3270 data fragment. */
1566         tty3270_convert_line(tp, tp->cy);
1567
1568         /* Setup timer to update display after 1/10 second */
1569         if (!timer_pending(&tp->timer))
1570                 tty3270_set_timer(tp, HZ/10);
1571
1572         spin_unlock_bh(&tp->view.lock);
1573 }
1574
1575 /*
1576  * String write routine for 3270 ttys
1577  */
1578 static int
1579 tty3270_write(struct tty_struct * tty, int from_user,
1580               const unsigned char *buf, int count)
1581 {
1582         struct tty3270 *tp;
1583         int length, ret;
1584
1585         tp = tty->driver_data;
1586         if (!tp)
1587                 return 0;
1588         if (tp->char_count > 0) {
1589                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1590                 tp->char_count = 0;
1591         }
1592         if (!from_user) {
1593                 tty3270_do_write(tp, buf, count);
1594                 return count;
1595         }
1596         ret = 0;
1597         while (count > 0) {
1598                 length = count < TTY3270_CHAR_BUF_SIZE ?
1599                         count : TTY3270_CHAR_BUF_SIZE;
1600                 length -= copy_from_user(tp->char_buf, buf, length);
1601                 if (length == 0) {
1602                         if (!ret)
1603                                 ret = -EFAULT;
1604                         break;
1605                 }
1606                 tty3270_do_write(tp, tp->char_buf, count);
1607                 buf += length;
1608                 count -= length;
1609                 ret += length;
1610         }
1611         return ret;
1612 }
1613
1614 /*
1615  * Put single characters to the ttys character buffer
1616  */
1617 static void
1618 tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1619 {
1620         struct tty3270 *tp;
1621
1622         tp = tty->driver_data;
1623         if (!tp)
1624                 return;
1625         if (tp->char_count < TTY3270_CHAR_BUF_SIZE)
1626                 tp->char_buf[tp->char_count++] = ch;
1627 }
1628
1629 /*
1630  * Flush all characters from the ttys characeter buffer put there
1631  * by tty3270_put_char.
1632  */
1633 static void
1634 tty3270_flush_chars(struct tty_struct *tty)
1635 {
1636         struct tty3270 *tp;
1637
1638         tp = tty->driver_data;
1639         if (!tp)
1640                 return;
1641         if (tp->char_count > 0) {
1642                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1643                 tp->char_count = 0;
1644         }
1645 }
1646
1647 /*
1648  * Returns the number of characters in the output buffer. This is
1649  * used in tty_wait_until_sent to wait until all characters have
1650  * appeared on the screen.
1651  */
1652 static int
1653 tty3270_chars_in_buffer(struct tty_struct *tty)
1654 {
1655         return 0;
1656 }
1657
1658 static void
1659 tty3270_flush_buffer(struct tty_struct *tty)
1660 {
1661 }
1662
1663 /*
1664  * Check for visible/invisible input switches
1665  */
1666 static void
1667 tty3270_set_termios(struct tty_struct *tty, struct termios *old)
1668 {
1669         struct tty3270 *tp;
1670         int new;
1671
1672         tp = tty->driver_data;
1673         if (!tp)
1674                 return;
1675         spin_lock_bh(&tp->view.lock);
1676         if (L_ICANON(tty)) {
1677                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1678                 if (new != tp->inattr) {
1679                         tp->inattr = new;
1680                         tty3270_update_prompt(tp, 0, 0);
1681                         tty3270_set_timer(tp, 1);
1682                 }
1683         }
1684         spin_unlock_bh(&tp->view.lock);
1685 }
1686
1687 /*
1688  * Disable reading from a 3270 tty
1689  */
1690 static void
1691 tty3270_throttle(struct tty_struct * tty)
1692 {
1693         struct tty3270 *tp;
1694
1695         tp = tty->driver_data;
1696         if (!tp)
1697                 return;
1698         tp->throttle = 1;
1699 }
1700
1701 /*
1702  * Enable reading from a 3270 tty
1703  */
1704 static void
1705 tty3270_unthrottle(struct tty_struct * tty)
1706 {
1707         struct tty3270 *tp;
1708
1709         tp = tty->driver_data;
1710         if (!tp)
1711                 return;
1712         tp->throttle = 0;
1713         if (tp->attn)
1714                 tty3270_issue_read(tp, 1);
1715 }
1716
1717 /*
1718  * Hang up the tty device.
1719  */
1720 static void
1721 tty3270_hangup(struct tty_struct *tty)
1722 {
1723         // FIXME: implement
1724 }
1725
1726 static void
1727 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1728 {
1729 }
1730
1731 static int
1732 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1733               unsigned int cmd, unsigned long arg)
1734 {
1735         struct tty3270 *tp;
1736
1737         tp = tty->driver_data;
1738         if (!tp)
1739                 return -ENODEV;
1740         if (tty->flags & (1 << TTY_IO_ERROR))
1741                 return -EIO;
1742         return kbd_ioctl(tp->kbd, file, cmd, arg);
1743 }
1744
1745 static struct tty_operations tty3270_ops = {
1746         .open = tty3270_open,
1747         .close = tty3270_close,
1748         .write = tty3270_write,
1749         .put_char = tty3270_put_char,
1750         .flush_chars = tty3270_flush_chars,
1751         .write_room = tty3270_write_room,
1752         .chars_in_buffer = tty3270_chars_in_buffer,
1753         .flush_buffer = tty3270_flush_buffer,
1754         .throttle = tty3270_throttle,
1755         .unthrottle = tty3270_unthrottle,
1756         .hangup = tty3270_hangup,
1757         .wait_until_sent = tty3270_wait_until_sent,
1758         .ioctl = tty3270_ioctl,
1759         .set_termios = tty3270_set_termios
1760 };
1761
1762 void
1763 tty3270_notifier(int index, int active)
1764 {
1765         if (active)
1766                 tty_register_device(tty3270_driver, index, 0);
1767         else
1768                 tty_unregister_device(tty3270_driver, index);
1769 }
1770
1771 /*
1772  * 3270 tty registration code called from tty_init().
1773  * Most kernel services (incl. kmalloc) are available at this poimt.
1774  */
1775 int __init
1776 tty3270_init(void)
1777 {
1778         struct tty_driver *driver;
1779         int ret;
1780
1781         ret = raw3270_init();
1782         if (ret)
1783                 return ret;
1784         driver = alloc_tty_driver(256);
1785         if (!driver)
1786                 return -ENOMEM;
1787
1788         /*
1789          * Initialize the tty_driver structure
1790          * Entries in tty3270_driver that are NOT initialized:
1791          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1792          */
1793         driver->owner = THIS_MODULE;
1794         driver->devfs_name = "ttyTUB/";
1795         driver->driver_name = "ttyTUB";
1796         driver->name = "ttyTUB";
1797         driver->major = IBM_TTY3270_MAJOR;
1798         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1799         driver->subtype = SYSTEM_TYPE_TTY;
1800         driver->init_termios = tty_std_termios;
1801         driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_NO_DEVFS;
1802         tty_set_operations(driver, &tty3270_ops);
1803         ret = tty_register_driver(driver);
1804         if (ret) {
1805                 printk(KERN_ERR "tty3270 registration failed with %d\n", ret);
1806                 put_tty_driver(driver);
1807                 return ret;
1808         }
1809         tty3270_driver = driver;
1810         return 0;
1811 }
1812
1813 static void __exit
1814 tty3270_exit(void)
1815 {
1816         struct tty_driver *driver;
1817
1818         driver = tty3270_driver;
1819         tty3270_driver = 0;
1820         tty_unregister_driver(driver);
1821         raw3270_exit();
1822 }
1823
1824 MODULE_LICENSE("GPL");
1825 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1826
1827 module_init(tty3270_init);
1828 module_exit(tty3270_exit);