drivers/s390/char/tty3270.c

   1 /*
   2  *    IBM/3270 Driver - tty functions.
   3  *
   4  *  Author(s):
   5  *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   6  *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  *      -- Copyright IBM Corp. 2003
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/kdev_t.h>
  13 #include <linux/tty.h>
  14 #include <linux/vt_kern.h>
  15 #include <linux/init.h>
  16 #include <linux/console.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/workqueue.h>
  19
  20 #include <linux/slab.h>
  21 #include <linux/bootmem.h>
  22 #include <linux/compat.h>
  23
  24 #include <asm/ccwdev.h>
  25 #include <asm/cio.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/uaccess.h>
  28
  29 #include "raw3270.h"
  30 #include "tty3270.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 static int tty3270_max_index;
  39
  40 static struct raw3270_fn tty3270_fn;
  41
  42 struct tty3270_cell {
  43         unsigned char character;
  44         unsigned char highlight;
  45         unsigned char f_color;
  46 };
  47
  48 struct tty3270_line {
  49         struct tty3270_cell *cells;
  50         int len;
  51 };
  52
  53 #define ESCAPE_NPAR 8
  54
  55 /*
  56  * The main tty view data structure.
  57  * FIXME:
  58  * 1) describe line orientation & lines list concept against screen
  59  * 2) describe conversion of screen to lines
  60  * 3) describe line format.
  61  */
  62 struct tty3270 {
  63         struct raw3270_view view;
  64         struct tty_port port;
  65         void **freemem_pages;           /* Array of pages used for freemem. */
  66         struct list_head freemem;       /* List of free memory for strings. */
  67
  68         /* Output stuff. */
  69         struct list_head lines;         /* List of lines. */
  70         struct list_head update;        /* List of lines to update. */
  71         unsigned char wcc;              /* Write control character. */
  72         int nr_lines;                   /* # lines in list. */
  73         int nr_up;                      /* # lines up in history. */
  74         unsigned long update_flags;     /* Update indication bits. */
  75         struct string *status;          /* Lower right of display. */
  76         struct raw3270_request *write;  /* Single write request. */
  77         struct timer_list timer;        /* Output delay timer. */
  78
  79         /* Current tty screen. */
  80         unsigned int cx, cy;            /* Current output position. */
  81         unsigned int highlight;         /* Blink/reverse/underscore */
  82         unsigned int f_color;           /* Foreground color */
  83         struct tty3270_line *screen;
  84         unsigned int n_model, n_cols, n_rows;   /* New model & size */
  85         struct work_struct resize_work;
  86
  87         /* Input stuff. */
  88         struct string *prompt;          /* Output string for input area. */
  89         struct string *input;           /* Input string for read request. */
  90         struct raw3270_request *read;   /* Single read request. */
  91         struct raw3270_request *kreset; /* Single keyboard reset request. */
  92         unsigned char inattr;           /* Visible/invisible input. */
  93         int throttle, attn;             /* tty throttle/unthrottle. */
  94         struct tasklet_struct readlet;  /* Tasklet to issue read request. */
  95         struct kbd_data *kbd;           /* key_maps stuff. */
  96
  97         /* Escape sequence parsing. */
  98         int esc_state, esc_ques, esc_npar;
  99         int esc_par[ESCAPE_NPAR];
 100         unsigned int saved_cx, saved_cy;
 101         unsigned int saved_highlight, saved_f_color;
 102
 103         /* Command recalling. */
 104         struct list_head rcl_lines;     /* List of recallable lines. */
 105         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
 106         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
 107
 108         /* Character array for put_char/flush_chars. */
 109         unsigned int char_count;
 110         char char_buf[TTY3270_CHAR_BUF_SIZE];
 111 };
 112
 113 /* tty3270->update_flags. See tty3270_update for details. */
 114 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
 115 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
 116 #define TTY_UPDATE_INPUT        4       /* Update input line. */
 117 #define TTY_UPDATE_STATUS       8       /* Update status line. */
 118 #define TTY_UPDATE_ALL          16      /* Recreate screen. */
 119
 120 static void tty3270_update(struct tty3270 *);
 121 static void tty3270_resize_work(struct work_struct *work);
 122
 123 /*
 124  * Setup timeout for a device. On timeout trigger an update.
 125  */
 126 static void tty3270_set_timer(struct tty3270 *tp, int expires)
 127 {
 128         mod_timer(&tp->timer, jiffies + expires);
 129 }
 130
 131 /*
 132  * The input line are the two last lines of the screen.
 133  */
 134 static void
 135 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
 136 {
 137         struct string *line;
 138         unsigned int off;
 139
 140         line = tp->prompt;
 141         if (count != 0)
 142                 line->string[5] = TF_INMDT;
 143         else
 144                 line->string[5] = tp->inattr;
 145         if (count > tp->view.cols * 2 - 11)
 146                 count = tp->view.cols * 2 - 11;
 147         memcpy(line->string + 6, input, count);
 148         line->string[6 + count] = TO_IC;
 149         /* Clear to end of input line. */
 150         if (count < tp->view.cols * 2 - 11) {
 151                 line->string[7 + count] = TO_RA;
 152                 line->string[10 + count] = 0;
 153                 off = tp->view.cols * tp->view.rows - 9;
 154                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
 155                 line->len = 11 + count;
 156         } else
 157                 line->len = 7 + count;
 158         tp->update_flags |= TTY_UPDATE_INPUT;
 159 }
 160
 161 static void
 162 tty3270_create_prompt(struct tty3270 *tp)
 163 {
 164         static const unsigned char blueprint[] =
 165                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
 166                   /* empty input string */
 167                   TO_IC, TO_RA, 0, 0, 0 };
 168         struct string *line;
 169         unsigned int offset;
 170
 171         line = alloc_string(&tp->freemem,
 172                             sizeof(blueprint) + tp->view.cols * 2 - 9);
 173         tp->prompt = line;
 174         tp->inattr = TF_INPUT;
 175         /* Copy blueprint to status line */
 176         memcpy(line->string, blueprint, sizeof(blueprint));
 177         line->len = sizeof(blueprint);
 178         /* Set output offsets. */
 179         offset = tp->view.cols * (tp->view.rows - 2);
 180         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 181         offset = tp->view.cols * tp->view.rows - 9;
 182         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
 183
 184         /* Allocate input string for reading. */
 185         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
 186 }
 187
 188 /*
 189  * The status line is the last line of the screen. It shows the string
 190  * "Running"/"Holding" in the lower right corner of the screen.
 191  */
 192 static void
 193 tty3270_update_status(struct tty3270 * tp)
 194 {
 195         char *str;
 196
 197         str = (tp->nr_up != 0) ? "History" : "Running";
 198         memcpy(tp->status->string + 8, str, 7);
 199         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 200         tp->update_flags |= TTY_UPDATE_STATUS;
 201 }
 202
 203 static void
 204 tty3270_create_status(struct tty3270 * tp)
 205 {
 206         static const unsigned char blueprint[] =
 207                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
 208                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
 209                   TAC_RESET };
 210         struct string *line;
 211         unsigned int offset;
 212
 213         line = alloc_string(&tp->freemem,sizeof(blueprint));
 214         tp->status = line;
 215         /* Copy blueprint to status line */
 216         memcpy(line->string, blueprint, sizeof(blueprint));
 217         /* Set address to start of status string (= last 9 characters). */
 218         offset = tp->view.cols * tp->view.rows - 9;
 219         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 220 }
 221
 222 /*
 223  * Set output offsets to 3270 datastream fragment of a tty string.
 224  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
 225  */
 226 static void
 227 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
 228 {
 229         unsigned char *cp;
 230
 231         raw3270_buffer_address(tp->view.dev, line->string + 1,
 232                                tp->view.cols * nr);
 233         cp = line->string + line->len - 4;
 234         if (*cp == TO_RA)
 235                 raw3270_buffer_address(tp->view.dev, cp + 1,
 236                                        tp->view.cols * (nr + 1));
 237 }
 238
 239 /*
 240  * Rebuild update list to print all lines.
 241  */
 242 static void
 243 tty3270_rebuild_update(struct tty3270 *tp)
 244 {
 245         struct string *s, *n;
 246         int line, nr_up;
 247
 248         /*
 249          * Throw away update list and create a new one,
 250          * containing all lines that will fit on the screen.
 251          */
 252         list_for_each_entry_safe(s, n, &tp->update, update)
 253                 list_del_init(&s->update);
 254         line = tp->view.rows - 3;
 255         nr_up = tp->nr_up;
 256         list_for_each_entry_reverse(s, &tp->lines, list) {
 257                 if (nr_up > 0) {
 258                         nr_up--;
 259                         continue;
 260                 }
 261                 tty3270_update_string(tp, s, line);
 262                 list_add(&s->update, &tp->update);
 263                 if (--line < 0)
 264                         break;
 265         }
 266         tp->update_flags |= TTY_UPDATE_LIST;
 267 }
 268
 269 /*
 270  * Alloc string for size bytes. If there is not enough room in
 271  * freemem, free strings until there is room.
 272  */
 273 static struct string *
 274 tty3270_alloc_string(struct tty3270 *tp, size_t size)
 275 {
 276         struct string *s, *n;
 277
 278         s = alloc_string(&tp->freemem, size);
 279         if (s)
 280                 return s;
 281         list_for_each_entry_safe(s, n, &tp->lines, list) {
 282                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
 283                 list_del(&s->list);
 284                 if (!list_empty(&s->update))
 285                         list_del(&s->update);
 286                 tp->nr_lines--;
 287                 if (free_string(&tp->freemem, s) >= size)
 288                         break;
 289         }
 290         s = alloc_string(&tp->freemem, size);
 291         BUG_ON(!s);
 292         if (tp->nr_up != 0 &&
 293             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
 294                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
 295                 tty3270_rebuild_update(tp);
 296                 tty3270_update_status(tp);
 297         }
 298         return s;
 299 }
 300
 301 /*
 302  * Add an empty line to the list.
 303  */
 304 static void
 305 tty3270_blank_line(struct tty3270 *tp)
 306 {
 307         static const unsigned char blueprint[] =
 308                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
 309                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
 310         struct string *s;
 311
 312         s = tty3270_alloc_string(tp, sizeof(blueprint));
 313         memcpy(s->string, blueprint, sizeof(blueprint));
 314         s->len = sizeof(blueprint);
 315         list_add_tail(&s->list, &tp->lines);
 316         tp->nr_lines++;
 317         if (tp->nr_up != 0)
 318                 tp->nr_up++;
 319 }
 320
 321 /*
 322  * Write request completion callback.
 323  */
 324 static void
 325 tty3270_write_callback(struct raw3270_request *rq, void *data)
 326 {
 327         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 328
 329         if (rq->rc != 0) {
 330                 /* Write wasn't successful. Refresh all. */
 331                 tp->update_flags = TTY_UPDATE_ALL;
 332                 tty3270_set_timer(tp, 1);
 333         }
 334         raw3270_request_reset(rq);
 335         xchg(&tp->write, rq);
 336 }
 337
 338 /*
 339  * Update 3270 display.
 340  */
 341 static void
 342 tty3270_update(struct tty3270 *tp)
 343 {
 344         static char invalid_sba[2] = { 0xff, 0xff };
 345         struct raw3270_request *wrq;
 346         unsigned long updated;
 347         struct string *s, *n;
 348         char *sba, *str;
 349         int rc, len;
 350
 351         wrq = xchg(&tp->write, 0);
 352         if (!wrq) {
 353                 tty3270_set_timer(tp, 1);
 354                 return;
 355         }
 356
 357         spin_lock(&tp->view.lock);
 358         updated = 0;
 359         if (tp->update_flags & TTY_UPDATE_ALL) {
 360                 tty3270_rebuild_update(tp);
 361                 tty3270_update_status(tp);
 362                 tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
 363                         TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
 364         }
 365         if (tp->update_flags & TTY_UPDATE_ERASE) {
 366                 /* Use erase write alternate to erase display. */
 367                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 368                 updated |= TTY_UPDATE_ERASE;
 369         } else
 370                 raw3270_request_set_cmd(wrq, TC_WRITE);
 371
 372         raw3270_request_add_data(wrq, &tp->wcc, 1);
 373         tp->wcc = TW_NONE;
 374
 375         /*
 376          * Update status line.
 377          */
 378         if (tp->update_flags & TTY_UPDATE_STATUS)
 379                 if (raw3270_request_add_data(wrq, tp->status->string,
 380                                              tp->status->len) == 0)
 381                         updated |= TTY_UPDATE_STATUS;
 382
 383         /*
 384          * Write input line.
 385          */
 386         if (tp->update_flags & TTY_UPDATE_INPUT)
 387                 if (raw3270_request_add_data(wrq, tp->prompt->string,
 388                                              tp->prompt->len) == 0)
 389                         updated |= TTY_UPDATE_INPUT;
 390
 391         sba = invalid_sba;
 392
 393         if (tp->update_flags & TTY_UPDATE_LIST) {
 394                 /* Write strings in the update list to the screen. */
 395                 list_for_each_entry_safe(s, n, &tp->update, update) {
 396                         str = s->string;
 397                         len = s->len;
 398                         /*
 399                          * Skip TO_SBA at the start of the string if the
 400                          * last output position matches the start address
 401                          * of this line.
 402                          */
 403                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
 404                                 str += 3, len -= 3;
 405                         if (raw3270_request_add_data(wrq, str, len) != 0)
 406                                 break;
 407                         list_del_init(&s->update);
 408                         sba = s->string + s->len - 3;
 409                 }
 410                 if (list_empty(&tp->update))
 411                         updated |= TTY_UPDATE_LIST;
 412         }
 413         wrq->callback = tty3270_write_callback;
 414         rc = raw3270_start(&tp->view, wrq);
 415         if (rc == 0) {
 416                 tp->update_flags &= ~updated;
 417                 if (tp->update_flags)
 418                         tty3270_set_timer(tp, 1);
 419         } else {
 420                 raw3270_request_reset(wrq);
 421                 xchg(&tp->write, wrq);
 422         }
 423         spin_unlock(&tp->view.lock);
 424 }
 425
 426 /*
 427  * Command recalling.
 428  */
 429 static void
 430 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
 431 {
 432         struct string *s;
 433
 434         tp->rcl_walk = NULL;
 435         if (len <= 0)
 436                 return;
 437         if (tp->rcl_nr >= tp->rcl_max) {
 438                 s = list_entry(tp->rcl_lines.next, struct string, list);
 439                 list_del(&s->list);
 440                 free_string(&tp->freemem, s);
 441                 tp->rcl_nr--;
 442         }
 443         s = tty3270_alloc_string(tp, len);
 444         memcpy(s->string, input, len);
 445         list_add_tail(&s->list, &tp->rcl_lines);
 446         tp->rcl_nr++;
 447 }
 448
 449 static void
 450 tty3270_rcl_backward(struct kbd_data *kbd)
 451 {
 452         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 453         struct string *s;
 454
 455         spin_lock_bh(&tp->view.lock);
 456         if (tp->inattr == TF_INPUT) {
 457                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
 458                         tp->rcl_walk = tp->rcl_walk->prev;
 459                 else if (!list_empty(&tp->rcl_lines))
 460                         tp->rcl_walk = tp->rcl_lines.prev;
 461                 s = tp->rcl_walk ?
 462                         list_entry(tp->rcl_walk, struct string, list) : NULL;
 463                 if (tp->rcl_walk) {
 464                         s = list_entry(tp->rcl_walk, struct string, list);
 465                         tty3270_update_prompt(tp, s->string, s->len);
 466                 } else
 467                         tty3270_update_prompt(tp, NULL, 0);
 468                 tty3270_set_timer(tp, 1);
 469         }
 470         spin_unlock_bh(&tp->view.lock);
 471 }
 472
 473 /*
 474  * Deactivate tty view.
 475  */
 476 static void
 477 tty3270_exit_tty(struct kbd_data *kbd)
 478 {
 479         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 480
 481         raw3270_deactivate_view(&tp->view);
 482 }
 483
 484 /*
 485  * Scroll forward in history.
 486  */
 487 static void
 488 tty3270_scroll_forward(struct kbd_data *kbd)
 489 {
 490         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 491         int nr_up;
 492
 493         spin_lock_bh(&tp->view.lock);
 494         nr_up = tp->nr_up - tp->view.rows + 2;
 495         if (nr_up < 0)
 496                 nr_up = 0;
 497         if (nr_up != tp->nr_up) {
 498                 tp->nr_up = nr_up;
 499                 tty3270_rebuild_update(tp);
 500                 tty3270_update_status(tp);
 501                 tty3270_set_timer(tp, 1);
 502         }
 503         spin_unlock_bh(&tp->view.lock);
 504 }
 505
 506 /*
 507  * Scroll backward in history.
 508  */
 509 static void
 510 tty3270_scroll_backward(struct kbd_data *kbd)
 511 {
 512         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 513         int nr_up;
 514
 515         spin_lock_bh(&tp->view.lock);
 516         nr_up = tp->nr_up + tp->view.rows - 2;
 517         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
 518                 nr_up = tp->nr_lines - tp->view.rows + 2;
 519         if (nr_up != tp->nr_up) {
 520                 tp->nr_up = nr_up;
 521                 tty3270_rebuild_update(tp);
 522                 tty3270_update_status(tp);
 523                 tty3270_set_timer(tp, 1);
 524         }
 525         spin_unlock_bh(&tp->view.lock);
 526 }
 527
 528 /*
 529  * Pass input line to tty.
 530  */
 531 static void
 532 tty3270_read_tasklet(struct raw3270_request *rrq)
 533 {
 534         static char kreset_data = TW_KR;
 535         struct tty3270 *tp = container_of(rrq->view, struct tty3270, view);
 536         char *input;
 537         int len;
 538
 539         spin_lock_bh(&tp->view.lock);
 540         /*
 541          * Two AID keys are special: For 0x7d (enter) the input line
 542          * has to be emitted to the tty and for 0x6d the screen
 543          * needs to be redrawn.
 544          */
 545         input = NULL;
 546         len = 0;
 547         if (tp->input->string[0] == 0x7d) {
 548                 /* Enter: write input to tty. */
 549                 input = tp->input->string + 6;
 550                 len = tp->input->len - 6 - rrq->rescnt;
 551                 if (tp->inattr != TF_INPUTN)
 552                         tty3270_rcl_add(tp, input, len);
 553                 if (tp->nr_up > 0) {
 554                         tp->nr_up = 0;
 555                         tty3270_rebuild_update(tp);
 556                         tty3270_update_status(tp);
 557                 }
 558                 /* Clear input area. */
 559                 tty3270_update_prompt(tp, NULL, 0);
 560                 tty3270_set_timer(tp, 1);
 561         } else if (tp->input->string[0] == 0x6d) {
 562                 /* Display has been cleared. Redraw. */
 563                 tp->update_flags = TTY_UPDATE_ALL;
 564                 tty3270_set_timer(tp, 1);
 565         }
 566         spin_unlock_bh(&tp->view.lock);
 567
 568         /* Start keyboard reset command. */
 569         raw3270_request_reset(tp->kreset);
 570         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
 571         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
 572         raw3270_start(&tp->view, tp->kreset);
 573
 574         while (len-- > 0)
 575                 kbd_keycode(tp->kbd, *input++);
 576         /* Emit keycode for AID byte. */
 577         kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
 578
 579         raw3270_request_reset(rrq);
 580         xchg(&tp->read, rrq);
 581         raw3270_put_view(&tp->view);
 582 }
 583
 584 /*
 585  * Read request completion callback.
 586  */
 587 static void
 588 tty3270_read_callback(struct raw3270_request *rq, void *data)
 589 {
 590         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 591         raw3270_get_view(rq->view);
 592         /* Schedule tasklet to pass input to tty. */
 593         tasklet_schedule(&tp->readlet);
 594 }
 595
 596 /*
 597  * Issue a read request. Call with device lock.
 598  */
 599 static void
 600 tty3270_issue_read(struct tty3270 *tp, int lock)
 601 {
 602         struct raw3270_request *rrq;
 603         int rc;
 604
 605         rrq = xchg(&tp->read, 0);
 606         if (!rrq)
 607                 /* Read already scheduled. */
 608                 return;
 609         rrq->callback = tty3270_read_callback;
 610         rrq->callback_data = tp;
 611         raw3270_request_set_cmd(rrq, TC_READMOD);
 612         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
 613         /* Issue the read modified request. */
 614         if (lock) {
 615                 rc = raw3270_start(&tp->view, rrq);
 616         } else
 617                 rc = raw3270_start_irq(&tp->view, rrq);
 618         if (rc) {
 619                 raw3270_request_reset(rrq);
 620                 xchg(&tp->read, rrq);
 621         }
 622 }
 623
 624 /*
 625  * Switch to the tty view.
 626  */
 627 static int
 628 tty3270_activate(struct raw3270_view *view)
 629 {
 630         struct tty3270 *tp = container_of(view, struct tty3270, view);
 631
 632         tp->update_flags = TTY_UPDATE_ALL;
 633         tty3270_set_timer(tp, 1);
 634         return 0;
 635 }
 636
 637 static void
 638 tty3270_deactivate(struct raw3270_view *view)
 639 {
 640         struct tty3270 *tp = container_of(view, struct tty3270, view);
 641
 642         del_timer(&tp->timer);
 643 }
 644
 645 static int
 646 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 647 {
 648         /* Handle ATTN. Schedule tasklet to read aid. */
 649         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 650                 if (!tp->throttle)
 651                         tty3270_issue_read(tp, 0);
 652                 else
 653                         tp->attn = 1;
 654         }
 655
 656         if (rq) {
 657                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 658                         rq->rc = -EIO;
 659                 else
 660                         /* Normal end. Copy residual count. */
 661                         rq->rescnt = irb->scsw.cmd.count;
 662         } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 663                 /* Interrupt without an outstanding request -> update all */
 664                 tp->update_flags = TTY_UPDATE_ALL;
 665                 tty3270_set_timer(tp, 1);
 666         }
 667         return RAW3270_IO_DONE;
 668 }
 669
 670 /*
 671  * Allocate tty3270 structure.
 672  */
 673 static struct tty3270 *
 674 tty3270_alloc_view(void)
 675 {
 676         struct tty3270 *tp;
 677         int pages;
 678
 679         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
 680         if (!tp)
 681                 goto out_err;
 682         tp->freemem_pages =
 683                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 684         if (!tp->freemem_pages)
 685                 goto out_tp;
 686         INIT_LIST_HEAD(&tp->freemem);
 687         INIT_LIST_HEAD(&tp->lines);
 688         INIT_LIST_HEAD(&tp->update);
 689         INIT_LIST_HEAD(&tp->rcl_lines);
 690         tp->rcl_max = 20;
 691
 692         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 693                 tp->freemem_pages[pages] = (void *)
 694                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 695                 if (!tp->freemem_pages[pages])
 696                         goto out_pages;
 697                 add_string_memory(&tp->freemem,
 698                                   tp->freemem_pages[pages], PAGE_SIZE);
 699         }
 700         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 701         if (IS_ERR(tp->write))
 702                 goto out_pages;
 703         tp->read = raw3270_request_alloc(0);
 704         if (IS_ERR(tp->read))
 705                 goto out_write;
 706         tp->kreset = raw3270_request_alloc(1);
 707         if (IS_ERR(tp->kreset))
 708                 goto out_read;
 709         tp->kbd = kbd_alloc();
 710         if (!tp->kbd)
 711                 goto out_reset;
 712
 713         tty_port_init(&tp->port);
 714         setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update,
 715                     (unsigned long) tp);
 716         tasklet_init(&tp->readlet,
 717                      (void (*)(unsigned long)) tty3270_read_tasklet,
 718                      (unsigned long) tp->read);
 719         INIT_WORK(&tp->resize_work, tty3270_resize_work);
 720
 721         return tp;
 722
 723 out_reset:
 724         raw3270_request_free(tp->kreset);
 725 out_read:
 726         raw3270_request_free(tp->read);
 727 out_write:
 728         raw3270_request_free(tp->write);
 729 out_pages:
 730         while (pages--)
 731                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 732         kfree(tp->freemem_pages);
 733         tty_port_destroy(&tp->port);
 734 out_tp:
 735         kfree(tp);
 736 out_err:
 737         return ERR_PTR(-ENOMEM);
 738 }
 739
 740 /*
 741  * Free tty3270 structure.
 742  */
 743 static void
 744 tty3270_free_view(struct tty3270 *tp)
 745 {
 746         int pages;
 747
 748         kbd_free(tp->kbd);
 749         raw3270_request_free(tp->kreset);
 750         raw3270_request_free(tp->read);
 751         raw3270_request_free(tp->write);
 752         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 753                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 754         kfree(tp->freemem_pages);
 755         tty_port_destroy(&tp->port);
 756         kfree(tp);
 757 }
 758
 759 /*
 760  * Allocate tty3270 screen.
 761  */
 762 static struct tty3270_line *
 763 tty3270_alloc_screen(unsigned int rows, unsigned int cols)
 764 {
 765         struct tty3270_line *screen;
 766         unsigned long size;
 767         int lines;
 768
 769         size = sizeof(struct tty3270_line) * (rows - 2);
 770         screen = kzalloc(size, GFP_KERNEL);
 771         if (!screen)
 772                 goto out_err;
 773         for (lines = 0; lines < rows - 2; lines++) {
 774                 size = sizeof(struct tty3270_cell) * cols;
 775                 screen[lines].cells = kzalloc(size, GFP_KERNEL);
 776                 if (!screen[lines].cells)
 777                         goto out_screen;
 778         }
 779         return screen;
 780 out_screen:
 781         while (lines--)
 782                 kfree(screen[lines].cells);
 783         kfree(screen);
 784 out_err:
 785         return ERR_PTR(-ENOMEM);
 786 }
 787
 788 /*
 789  * Free tty3270 screen.
 790  */
 791 static void
 792 tty3270_free_screen(struct tty3270_line *screen, unsigned int rows)
 793 {
 794         int lines;
 795
 796         for (lines = 0; lines < rows - 2; lines++)
 797                 kfree(screen[lines].cells);
 798         kfree(screen);
 799 }
 800
 801 /*
 802  * Resize tty3270 screen
 803  */
 804 static void tty3270_resize_work(struct work_struct *work)
 805 {
 806         struct tty3270 *tp = container_of(work, struct tty3270, resize_work);
 807         struct tty3270_line *screen, *oscreen;
 808         struct tty_struct *tty;
 809         unsigned int orows;
 810         struct winsize ws;
 811
 812         screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
 813         if (IS_ERR(screen))
 814                 return;
 815         /* Switch to new output size */
 816         spin_lock_bh(&tp->view.lock);
 817         oscreen = tp->screen;
 818         orows = tp->view.rows;
 819         tp->view.model = tp->n_model;
 820         tp->view.rows = tp->n_rows;
 821         tp->view.cols = tp->n_cols;
 822         tp->screen = screen;
 823         free_string(&tp->freemem, tp->prompt);
 824         free_string(&tp->freemem, tp->status);
 825         tty3270_create_prompt(tp);
 826         tty3270_create_status(tp);
 827         tp->nr_up = 0;
 828         while (tp->nr_lines < tp->view.rows - 2)
 829                 tty3270_blank_line(tp);
 830         tp->update_flags = TTY_UPDATE_ALL;
 831         spin_unlock_bh(&tp->view.lock);
 832         tty3270_free_screen(oscreen, orows);
 833         tty3270_set_timer(tp, 1);
 834         /* Informat tty layer about new size */
 835         tty = tty_port_tty_get(&tp->port);
 836         if (!tty)
 837                 return;
 838         ws.ws_row = tp->view.rows - 2;
 839         ws.ws_col = tp->view.cols;
 840         tty_do_resize(tty, &ws);
 841 }
 842
 843 static void
 844 tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
 845 {
 846         struct tty3270 *tp = container_of(view, struct tty3270, view);
 847
 848         tp->n_model = model;
 849         tp->n_rows = rows;
 850         tp->n_cols = cols;
 851         schedule_work(&tp->resize_work);
 852 }
 853
 854 /*
 855  * Unlink tty3270 data structure from tty.
 856  */
 857 static void
 858 tty3270_release(struct raw3270_view *view)
 859 {
 860         struct tty3270 *tp = container_of(view, struct tty3270, view);
 861         struct tty_struct *tty = tty_port_tty_get(&tp->port);
 862
 863         if (tty) {
 864                 tty->driver_data = NULL;
 865                 tty_port_tty_set(&tp->port, NULL);
 866                 tty_hangup(tty);
 867                 raw3270_put_view(&tp->view);
 868                 tty_kref_put(tty);
 869         }
 870 }
 871
 872 /*
 873  * Free tty3270 data structure
 874  */
 875 static void
 876 tty3270_free(struct raw3270_view *view)
 877 {
 878         struct tty3270 *tp = container_of(view, struct tty3270, view);
 879
 880         del_timer_sync(&tp->timer);
 881         tty3270_free_screen(tp->screen, tp->view.rows);
 882         tty3270_free_view(tp);
 883 }
 884
 885 /*
 886  * Delayed freeing of tty3270 views.
 887  */
 888 static void
 889 tty3270_del_views(void)
 890 {
 891         int i;
 892
 893         for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
 894                 struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
 895                 if (!IS_ERR(view))
 896                         raw3270_del_view(view);
 897         }
 898 }
 899
 900 static struct raw3270_fn tty3270_fn = {
 901         .activate = tty3270_activate,
 902         .deactivate = tty3270_deactivate,
 903         .intv = (void *) tty3270_irq,
 904         .release = tty3270_release,
 905         .free = tty3270_free,
 906         .resize = tty3270_resize
 907 };
 908
 909 /*
 910  * This routine is called whenever a 3270 tty is opened first time.
 911  */
 912 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 913 {
 914         struct raw3270_view *view;
 915         struct tty3270 *tp;
 916         int i, rc;
 917
 918         /* Check if the tty3270 is already there. */
 919         view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
 920         if (!IS_ERR(view)) {
 921                 tp = container_of(view, struct tty3270, view);
 922                 tty->driver_data = tp;
 923                 tty->winsize.ws_row = tp->view.rows - 2;
 924                 tty->winsize.ws_col = tp->view.cols;
 925                 tp->port.low_latency = 0;
 926                 /* why to reassign? */
 927                 tty_port_tty_set(&tp->port, tty);
 928                 tp->inattr = TF_INPUT;
 929                 return tty_port_install(&tp->port, driver, tty);
 930         }
 931         if (tty3270_max_index < tty->index + 1)
 932                 tty3270_max_index = tty->index + 1;
 933
 934         /* Allocate tty3270 structure on first open. */
 935         tp = tty3270_alloc_view();
 936         if (IS_ERR(tp))
 937                 return PTR_ERR(tp);
 938
 939         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 940                               tty->index + RAW3270_FIRSTMINOR,
 941                               RAW3270_VIEW_LOCK_BH);
 942         if (rc) {
 943                 tty3270_free_view(tp);
 944                 return rc;
 945         }
 946
 947         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 948         if (IS_ERR(tp->screen)) {
 949                 rc = PTR_ERR(tp->screen);
 950                 raw3270_put_view(&tp->view);
 951                 raw3270_del_view(&tp->view);
 952                 tty3270_free_view(tp);
 953                 return rc;
 954         }
 955
 956         tty_port_tty_set(&tp->port, tty);
 957         tp->port.low_latency = 0;
 958         tty->winsize.ws_row = tp->view.rows - 2;
 959         tty->winsize.ws_col = tp->view.cols;
 960
 961         tty3270_create_prompt(tp);
 962         tty3270_create_status(tp);
 963         tty3270_update_status(tp);
 964
 965         /* Create blank line for every line in the tty output area. */
 966         for (i = 0; i < tp->view.rows - 2; i++)
 967                 tty3270_blank_line(tp);
 968
 969         tp->kbd->port = &tp->port;
 970         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
 971         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
 972         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
 973         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
 974         kbd_ascebc(tp->kbd, tp->view.ascebc);
 975
 976         raw3270_activate_view(&tp->view);
 977
 978         rc = tty_port_install(&tp->port, driver, tty);
 979         if (rc) {
 980                 raw3270_put_view(&tp->view);
 981                 return rc;
 982         }
 983
 984         tty->driver_data = tp;
 985
 986         return 0;
 987 }
 988
 989 /*
 990  * This routine is called whenever a 3270 tty is opened.
 991  */
 992 static int
 993 tty3270_open(struct tty_struct *tty, struct file *filp)
 994 {
 995         struct tty3270 *tp = tty->driver_data;
 996         struct tty_port *port = &tp->port;
 997
 998         port->count++;
 999         tty_port_tty_set(port, tty);
1000         return 0;
1001 }
1002
1003 /*
1004  * This routine is called when the 3270 tty is closed. We wait
1005  * for the remaining request to be completed. Then we clean up.
1006  */
1007 static void
1008 tty3270_close(struct tty_struct *tty, struct file * filp)
1009 {
1010         struct tty3270 *tp = tty->driver_data;
1011
1012         if (tty->count > 1)
1013                 return;
1014         if (tp) {
1015                 tty->driver_data = NULL;
1016                 tty_port_tty_set(&tp->port, NULL);
1017         }
1018 }
1019
1020 static void tty3270_cleanup(struct tty_struct *tty)
1021 {
1022         struct tty3270 *tp = tty->driver_data;
1023
1024         if (tp)
1025                 raw3270_put_view(&tp->view);
1026 }
1027
1028 /*
1029  * We always have room.
1030  */
1031 static int
1032 tty3270_write_room(struct tty_struct *tty)
1033 {
1034         return INT_MAX;
1035 }
1036
1037 /*
1038  * Insert character into the screen at the current position with the
1039  * current color and highlight. This function does NOT do cursor movement.
1040  */
1041 static void tty3270_put_character(struct tty3270 *tp, char ch)
1042 {
1043         struct tty3270_line *line;
1044         struct tty3270_cell *cell;
1045
1046         line = tp->screen + tp->cy;
1047         if (line->len <= tp->cx) {
1048                 while (line->len < tp->cx) {
1049                         cell = line->cells + line->len;
1050                         cell->character = tp->view.ascebc[' '];
1051                         cell->highlight = tp->highlight;
1052                         cell->f_color = tp->f_color;
1053                         line->len++;
1054                 }
1055                 line->len++;
1056         }
1057         cell = line->cells + tp->cx;
1058         cell->character = tp->view.ascebc[(unsigned int) ch];
1059         cell->highlight = tp->highlight;
1060         cell->f_color = tp->f_color;
1061 }
1062
1063 /*
1064  * Convert a tty3270_line to a 3270 data fragment usable for output.
1065  */
1066 static void
1067 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1068 {
1069         struct tty3270_line *line;
1070         struct tty3270_cell *cell;
1071         struct string *s, *n;
1072         unsigned char highlight;
1073         unsigned char f_color;
1074         char *cp;
1075         int flen, i;
1076
1077         /* Determine how long the fragment will be. */
1078         flen = 3;               /* Prefix (TO_SBA). */
1079         line = tp->screen + line_nr;
1080         flen += line->len;
1081         highlight = TAX_RESET;
1082         f_color = TAC_RESET;
1083         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1084                 if (cell->highlight != highlight) {
1085                         flen += 3;      /* TO_SA to switch highlight. */
1086                         highlight = cell->highlight;
1087                 }
1088                 if (cell->f_color != f_color) {
1089                         flen += 3;      /* TO_SA to switch color. */
1090                         f_color = cell->f_color;
1091                 }
1092         }
1093         if (highlight != TAX_RESET)
1094                 flen += 3;      /* TO_SA to reset hightlight. */
1095         if (f_color != TAC_RESET)
1096                 flen += 3;      /* TO_SA to reset color. */
1097         if (line->len < tp->view.cols)
1098                 flen += 4;      /* Postfix (TO_RA). */
1099
1100         /* Find the line in the list. */
1101         i = tp->view.rows - 2 - line_nr;
1102         list_for_each_entry_reverse(s, &tp->lines, list)
1103                 if (--i <= 0)
1104                         break;
1105         /*
1106          * Check if the line needs to get reallocated.
1107          */
1108         if (s->len != flen) {
1109                 /* Reallocate string. */
1110                 n = tty3270_alloc_string(tp, flen);
1111                 list_add(&n->list, &s->list);
1112                 list_del_init(&s->list);
1113                 if (!list_empty(&s->update))
1114                         list_del_init(&s->update);
1115                 free_string(&tp->freemem, s);
1116                 s = n;
1117         }
1118
1119         /* Write 3270 data fragment. */
1120         cp = s->string;
1121         *cp++ = TO_SBA;
1122         *cp++ = 0;
1123         *cp++ = 0;
1124
1125         highlight = TAX_RESET;
1126         f_color = TAC_RESET;
1127         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1128                 if (cell->highlight != highlight) {
1129                         *cp++ = TO_SA;
1130                         *cp++ = TAT_EXTHI;
1131                         *cp++ = cell->highlight;
1132                         highlight = cell->highlight;
1133                 }
1134                 if (cell->f_color != f_color) {
1135                         *cp++ = TO_SA;
1136                         *cp++ = TAT_COLOR;
1137                         *cp++ = cell->f_color;
1138                         f_color = cell->f_color;
1139                 }
1140                 *cp++ = cell->character;
1141         }
1142         if (highlight != TAX_RESET) {
1143                 *cp++ = TO_SA;
1144                 *cp++ = TAT_EXTHI;
1145                 *cp++ = TAX_RESET;
1146         }
1147         if (f_color != TAC_RESET) {
1148                 *cp++ = TO_SA;
1149                 *cp++ = TAT_COLOR;
1150                 *cp++ = TAC_RESET;
1151         }
1152         if (line->len < tp->view.cols) {
1153                 *cp++ = TO_RA;
1154                 *cp++ = 0;
1155                 *cp++ = 0;
1156                 *cp++ = 0;
1157         }
1158
1159         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1160                 /* Line is currently visible on screen. */
1161                 tty3270_update_string(tp, s, line_nr);
1162                 /* Add line to update list. */
1163                 if (list_empty(&s->update)) {
1164                         list_add_tail(&s->update, &tp->update);
1165                         tp->update_flags |= TTY_UPDATE_LIST;
1166                 }
1167         }
1168 }
1169
1170 /*
1171  * Do carriage return.
1172  */
1173 static void
1174 tty3270_cr(struct tty3270 *tp)
1175 {
1176         tp->cx = 0;
1177 }
1178
1179 /*
1180  * Do line feed.
1181  */
1182 static void
1183 tty3270_lf(struct tty3270 *tp)
1184 {
1185         struct tty3270_line temp;
1186         int i;
1187
1188         tty3270_convert_line(tp, tp->cy);
1189         if (tp->cy < tp->view.rows - 3) {
1190                 tp->cy++;
1191                 return;
1192         }
1193         /* Last line just filled up. Add new, blank line. */
1194         tty3270_blank_line(tp);
1195         temp = tp->screen[0];
1196         temp.len = 0;
1197         for (i = 0; i < tp->view.rows - 3; i++)
1198                 tp->screen[i] = tp->screen[i+1];
1199         tp->screen[tp->view.rows - 3] = temp;
1200         tty3270_rebuild_update(tp);
1201 }
1202
1203 static void
1204 tty3270_ri(struct tty3270 *tp)
1205 {
1206         if (tp->cy > 0) {
1207             tty3270_convert_line(tp, tp->cy);
1208             tp->cy--;
1209         }
1210 }
1211
1212 /*
1213  * Insert characters at current position.
1214  */
1215 static void
1216 tty3270_insert_characters(struct tty3270 *tp, int n)
1217 {
1218         struct tty3270_line *line;
1219         int k;
1220
1221         line = tp->screen + tp->cy;
1222         while (line->len < tp->cx) {
1223                 line->cells[line->len].character = tp->view.ascebc[' '];
1224                 line->cells[line->len].highlight = TAX_RESET;
1225                 line->cells[line->len].f_color = TAC_RESET;
1226                 line->len++;
1227         }
1228         if (n > tp->view.cols - tp->cx)
1229                 n = tp->view.cols - tp->cx;
1230         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1231         while (k--)
1232                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1233         line->len += n;
1234         if (line->len > tp->view.cols)
1235                 line->len = tp->view.cols;
1236         while (n-- > 0) {
1237                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1238                 line->cells[tp->cx + n].highlight = tp->highlight;
1239                 line->cells[tp->cx + n].f_color = tp->f_color;
1240         }
1241 }
1242
1243 /*
1244  * Delete characters at current position.
1245  */
1246 static void
1247 tty3270_delete_characters(struct tty3270 *tp, int n)
1248 {
1249         struct tty3270_line *line;
1250         int i;
1251
1252         line = tp->screen + tp->cy;
1253         if (line->len <= tp->cx)
1254                 return;
1255         if (line->len - tp->cx <= n) {
1256                 line->len = tp->cx;
1257                 return;
1258         }
1259         for (i = tp->cx; i + n < line->len; i++)
1260                 line->cells[i] = line->cells[i + n];
1261         line->len -= n;
1262 }
1263
1264 /*
1265  * Erase characters at current position.
1266  */
1267 static void
1268 tty3270_erase_characters(struct tty3270 *tp, int n)
1269 {
1270         struct tty3270_line *line;
1271         struct tty3270_cell *cell;
1272
1273         line = tp->screen + tp->cy;
1274         while (line->len > tp->cx && n-- > 0) {
1275                 cell = line->cells + tp->cx++;
1276                 cell->character = ' ';
1277                 cell->highlight = TAX_RESET;
1278                 cell->f_color = TAC_RESET;
1279         }
1280         tp->cx += n;
1281         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1282 }
1283
1284 /*
1285  * Erase line, 3 different cases:
1286  *  Esc [ 0 K   Erase from current position to end of line inclusive
1287  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1288  *  Esc [ 2 K   Erase entire line (without moving cursor)
1289  */
1290 static void
1291 tty3270_erase_line(struct tty3270 *tp, int mode)
1292 {
1293         struct tty3270_line *line;
1294         struct tty3270_cell *cell;
1295         int i;
1296
1297         line = tp->screen + tp->cy;
1298         if (mode == 0)
1299                 line->len = tp->cx;
1300         else if (mode == 1) {
1301                 for (i = 0; i < tp->cx; i++) {
1302                         cell = line->cells + i;
1303                         cell->character = ' ';
1304                         cell->highlight = TAX_RESET;
1305                         cell->f_color = TAC_RESET;
1306                 }
1307                 if (line->len <= tp->cx)
1308                         line->len = tp->cx + 1;
1309         } else if (mode == 2)
1310                 line->len = 0;
1311         tty3270_convert_line(tp, tp->cy);
1312 }
1313
1314 /*
1315  * Erase display, 3 different cases:
1316  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1317  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1318  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1319  */
1320 static void
1321 tty3270_erase_display(struct tty3270 *tp, int mode)
1322 {
1323         int i;
1324
1325         if (mode == 0) {
1326                 tty3270_erase_line(tp, 0);
1327                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1328                         tp->screen[i].len = 0;
1329                         tty3270_convert_line(tp, i);
1330                 }
1331         } else if (mode == 1) {
1332                 for (i = 0; i < tp->cy; i++) {
1333                         tp->screen[i].len = 0;
1334                         tty3270_convert_line(tp, i);
1335                 }
1336                 tty3270_erase_line(tp, 1);
1337         } else if (mode == 2) {
1338                 for (i = 0; i < tp->view.rows - 2; i++) {
1339                         tp->screen[i].len = 0;
1340                         tty3270_convert_line(tp, i);
1341                 }
1342         }
1343         tty3270_rebuild_update(tp);
1344 }
1345
1346 /*
1347  * Set attributes found in an escape sequence.
1348  *  Esc [ <attr> ; <attr> ; ... m
1349  */
1350 static void
1351 tty3270_set_attributes(struct tty3270 *tp)
1352 {
1353         static unsigned char f_colors[] = {
1354                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1355                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1356         };
1357         int i, attr;
1358
1359         for (i = 0; i <= tp->esc_npar; i++) {
1360                 attr = tp->esc_par[i];
1361                 switch (attr) {
1362                 case 0:         /* Reset */
1363                         tp->highlight = TAX_RESET;
1364                         tp->f_color = TAC_RESET;
1365                         break;
1366                 /* Highlight. */
1367                 case 4:         /* Start underlining. */
1368                         tp->highlight = TAX_UNDER;
1369                         break;
1370                 case 5:         /* Start blink. */
1371                         tp->highlight = TAX_BLINK;
1372                         break;
1373                 case 7:         /* Start reverse. */
1374                         tp->highlight = TAX_REVER;
1375                         break;
1376                 case 24:        /* End underlining */
1377                         if (tp->highlight == TAX_UNDER)
1378                                 tp->highlight = TAX_RESET;
1379                         break;
1380                 case 25:        /* End blink. */
1381                         if (tp->highlight == TAX_BLINK)
1382                                 tp->highlight = TAX_RESET;
1383                         break;
1384                 case 27:        /* End reverse. */
1385                         if (tp->highlight == TAX_REVER)
1386                                 tp->highlight = TAX_RESET;
1387                         break;
1388                 /* Foreground color. */
1389                 case 30:        /* Black */
1390                 case 31:        /* Red */
1391                 case 32:        /* Green */
1392                 case 33:        /* Yellow */
1393                 case 34:        /* Blue */
1394                 case 35:        /* Magenta */
1395                 case 36:        /* Cyan */
1396                 case 37:        /* White */
1397                 case 39:        /* Black */
1398                         tp->f_color = f_colors[attr - 30];
1399                         break;
1400                 }
1401         }
1402 }
1403
1404 static inline int
1405 tty3270_getpar(struct tty3270 *tp, int ix)
1406 {
1407         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1408 }
1409
1410 static void
1411 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1412 {
1413         int max_cx = max(0, cx);
1414         int max_cy = max(0, cy);
1415
1416         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1417         cy = min_t(int, tp->view.rows - 3, max_cy);
1418         if (cy != tp->cy) {
1419                 tty3270_convert_line(tp, tp->cy);
1420                 tp->cy = cy;
1421         }
1422 }
1423
1424 /*
1425  * Process escape sequences. Known sequences:
1426  *  Esc 7                       Save Cursor Position
1427  *  Esc 8                       Restore Cursor Position
1428  *  Esc [ Pn ; Pn ; .. m        Set attributes
1429  *  Esc [ Pn ; Pn H             Cursor Position
1430  *  Esc [ Pn ; Pn f             Cursor Position
1431  *  Esc [ Pn A                  Cursor Up
1432  *  Esc [ Pn B                  Cursor Down
1433  *  Esc [ Pn C                  Cursor Forward
1434  *  Esc [ Pn D                  Cursor Backward
1435  *  Esc [ Pn G                  Cursor Horizontal Absolute
1436  *  Esc [ Pn X                  Erase Characters
1437  *  Esc [ Ps J                  Erase in Display
1438  *  Esc [ Ps K                  Erase in Line
1439  * // FIXME: add all the new ones.
1440  *
1441  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1442  *  Ps is a selective parameter.
1443  */
1444 static void
1445 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1446 {
1447         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1448
1449         if (tp->esc_state == ESnormal) {
1450                 if (ch == 0x1b)
1451                         /* Starting new escape sequence. */
1452                         tp->esc_state = ESesc;
1453                 return;
1454         }
1455         if (tp->esc_state == ESesc) {
1456                 tp->esc_state = ESnormal;
1457                 switch (ch) {
1458                 case '[':
1459                         tp->esc_state = ESsquare;
1460                         break;
1461                 case 'E':
1462                         tty3270_cr(tp);
1463                         tty3270_lf(tp);
1464                         break;
1465                 case 'M':
1466                         tty3270_ri(tp);
1467                         break;
1468                 case 'D':
1469                         tty3270_lf(tp);
1470                         break;
1471                 case 'Z':               /* Respond ID. */
1472                         kbd_puts_queue(&tp->port, "\033[?6c");
1473                         break;
1474                 case '7':               /* Save cursor position. */
1475                         tp->saved_cx = tp->cx;
1476                         tp->saved_cy = tp->cy;
1477                         tp->saved_highlight = tp->highlight;
1478                         tp->saved_f_color = tp->f_color;
1479                         break;
1480                 case '8':               /* Restore cursor position. */
1481                         tty3270_convert_line(tp, tp->cy);
1482                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1483                         tp->highlight = tp->saved_highlight;
1484                         tp->f_color = tp->saved_f_color;
1485                         break;
1486                 case 'c':               /* Reset terminal. */
1487                         tp->cx = tp->saved_cx = 0;
1488                         tp->cy = tp->saved_cy = 0;
1489                         tp->highlight = tp->saved_highlight = TAX_RESET;
1490                         tp->f_color = tp->saved_f_color = TAC_RESET;
1491                         tty3270_erase_display(tp, 2);
1492                         break;
1493                 }
1494                 return;
1495         }
1496         if (tp->esc_state == ESsquare) {
1497                 tp->esc_state = ESgetpars;
1498                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1499                 tp->esc_npar = 0;
1500                 tp->esc_ques = (ch == '?');
1501                 if (tp->esc_ques)
1502                         return;
1503         }
1504         if (tp->esc_state == ESgetpars) {
1505                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1506                         tp->esc_npar++;
1507                         return;
1508                 }
1509                 if (ch >= '0' && ch <= '9') {
1510                         tp->esc_par[tp->esc_npar] *= 10;
1511                         tp->esc_par[tp->esc_npar] += ch - '0';
1512                         return;
1513                 }
1514         }
1515         tp->esc_state = ESnormal;
1516         if (ch == 'n' && !tp->esc_ques) {
1517                 if (tp->esc_par[0] == 5)                /* Status report. */
1518                         kbd_puts_queue(&tp->port, "\033[0n");
1519                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1520                         char buf[40];
1521                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1522                         kbd_puts_queue(&tp->port, buf);
1523                 }
1524                 return;
1525         }
1526         if (tp->esc_ques)
1527                 return;
1528         switch (ch) {
1529         case 'm':
1530                 tty3270_set_attributes(tp);
1531                 break;
1532         case 'H':       /* Set cursor position. */
1533         case 'f':
1534                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1535                                 tty3270_getpar(tp, 0) - 1);
1536                 break;
1537         case 'd':       /* Set y position. */
1538                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1539                 break;
1540         case 'A':       /* Cursor up. */
1541         case 'F':
1542                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1543                 break;
1544         case 'B':       /* Cursor down. */
1545         case 'e':
1546         case 'E':
1547                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1548                 break;
1549         case 'C':       /* Cursor forward. */
1550         case 'a':
1551                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1552                 break;
1553         case 'D':       /* Cursor backward. */
1554                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1555                 break;
1556         case 'G':       /* Set x position. */
1557         case '`':
1558                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1559                 break;
1560         case 'X':       /* Erase Characters. */
1561                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1562                 break;
1563         case 'J':       /* Erase display. */
1564                 tty3270_erase_display(tp, tp->esc_par[0]);
1565                 break;
1566         case 'K':       /* Erase line. */
1567                 tty3270_erase_line(tp, tp->esc_par[0]);
1568                 break;
1569         case 'P':       /* Delete characters. */
1570                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1571                 break;
1572         case '@':       /* Insert characters. */
1573                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1574                 break;
1575         case 's':       /* Save cursor position. */
1576                 tp->saved_cx = tp->cx;
1577                 tp->saved_cy = tp->cy;
1578                 tp->saved_highlight = tp->highlight;
1579                 tp->saved_f_color = tp->f_color;
1580                 break;
1581         case 'u':       /* Restore cursor position. */
1582                 tty3270_convert_line(tp, tp->cy);
1583                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1584                 tp->highlight = tp->saved_highlight;
1585                 tp->f_color = tp->saved_f_color;
1586                 break;
1587         }
1588 }
1589
1590 /*
1591  * String write routine for 3270 ttys
1592  */
1593 static void
1594 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1595                 const unsigned char *buf, int count)
1596 {
1597         int i_msg, i;
1598
1599         spin_lock_bh(&tp->view.lock);
1600         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1601                 if (tp->esc_state != 0) {
1602                         /* Continue escape sequence. */
1603                         tty3270_escape_sequence(tp, buf[i_msg]);
1604                         continue;
1605                 }
1606
1607                 switch (buf[i_msg]) {
1608                 case 0x07:              /* '\a' -- Alarm */
1609                         tp->wcc |= TW_PLUSALARM;
1610                         break;
1611                 case 0x08:              /* Backspace. */
1612                         if (tp->cx > 0) {
1613                                 tp->cx--;
1614                                 tty3270_put_character(tp, ' ');
1615                         }
1616                         break;
1617                 case 0x09:              /* '\t' -- Tabulate */
1618                         for (i = tp->cx % 8; i < 8; i++) {
1619                                 if (tp->cx >= tp->view.cols) {
1620                                         tty3270_cr(tp);
1621                                         tty3270_lf(tp);
1622                                         break;
1623                                 }
1624                                 tty3270_put_character(tp, ' ');
1625                                 tp->cx++;
1626                         }
1627                         break;
1628                 case 0x0a:              /* '\n' -- New Line */
1629                         tty3270_cr(tp);
1630                         tty3270_lf(tp);
1631                         break;
1632                 case 0x0c:              /* '\f' -- Form Feed */
1633                         tty3270_erase_display(tp, 2);
1634                         tp->cx = tp->cy = 0;
1635                         break;
1636                 case 0x0d:              /* '\r' -- Carriage Return */
1637                         tp->cx = 0;
1638                         break;
1639                 case 0x0f:              /* SuSE "exit alternate mode" */
1640                         break;
1641                 case 0x1b:              /* Start escape sequence. */
1642                         tty3270_escape_sequence(tp, buf[i_msg]);
1643                         break;
1644                 default:                /* Insert normal character. */
1645                         if (tp->cx >= tp->view.cols) {
1646                                 tty3270_cr(tp);
1647                                 tty3270_lf(tp);
1648                         }
1649                         tty3270_put_character(tp, buf[i_msg]);
1650                         tp->cx++;
1651                         break;
1652                 }
1653         }
1654         /* Convert current line to 3270 data fragment. */
1655         tty3270_convert_line(tp, tp->cy);
1656
1657         /* Setup timer to update display after 1/10 second */
1658         if (!timer_pending(&tp->timer))
1659                 tty3270_set_timer(tp, HZ/10);
1660
1661         spin_unlock_bh(&tp->view.lock);
1662 }
1663
1664 /*
1665  * String write routine for 3270 ttys
1666  */
1667 static int
1668 tty3270_write(struct tty_struct * tty,
1669               const unsigned char *buf, int count)
1670 {
1671         struct tty3270 *tp;
1672
1673         tp = tty->driver_data;
1674         if (!tp)
1675                 return 0;
1676         if (tp->char_count > 0) {
1677                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1678                 tp->char_count = 0;
1679         }
1680         tty3270_do_write(tp, tty, buf, count);
1681         return count;
1682 }
1683
1684 /*
1685  * Put single characters to the ttys character buffer
1686  */
1687 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1688 {
1689         struct tty3270 *tp;
1690
1691         tp = tty->driver_data;
1692         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1693                 return 0;
1694         tp->char_buf[tp->char_count++] = ch;
1695         return 1;
1696 }
1697
1698 /*
1699  * Flush all characters from the ttys characeter buffer put there
1700  * by tty3270_put_char.
1701  */
1702 static void
1703 tty3270_flush_chars(struct tty_struct *tty)
1704 {
1705         struct tty3270 *tp;
1706
1707         tp = tty->driver_data;
1708         if (!tp)
1709                 return;
1710         if (tp->char_count > 0) {
1711                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1712                 tp->char_count = 0;
1713         }
1714 }
1715
1716 /*
1717  * Returns the number of characters in the output buffer. This is
1718  * used in tty_wait_until_sent to wait until all characters have
1719  * appeared on the screen.
1720  */
1721 static int
1722 tty3270_chars_in_buffer(struct tty_struct *tty)
1723 {
1724         return 0;
1725 }
1726
1727 static void
1728 tty3270_flush_buffer(struct tty_struct *tty)
1729 {
1730 }
1731
1732 /*
1733  * Check for visible/invisible input switches
1734  */
1735 static void
1736 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1737 {
1738         struct tty3270 *tp;
1739         int new;
1740
1741         tp = tty->driver_data;
1742         if (!tp)
1743                 return;
1744         spin_lock_bh(&tp->view.lock);
1745         if (L_ICANON(tty)) {
1746                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1747                 if (new != tp->inattr) {
1748                         tp->inattr = new;
1749                         tty3270_update_prompt(tp, NULL, 0);
1750                         tty3270_set_timer(tp, 1);
1751                 }
1752         }
1753         spin_unlock_bh(&tp->view.lock);
1754 }
1755
1756 /*
1757  * Disable reading from a 3270 tty
1758  */
1759 static void
1760 tty3270_throttle(struct tty_struct * tty)
1761 {
1762         struct tty3270 *tp;
1763
1764         tp = tty->driver_data;
1765         if (!tp)
1766                 return;
1767         tp->throttle = 1;
1768 }
1769
1770 /*
1771  * Enable reading from a 3270 tty
1772  */
1773 static void
1774 tty3270_unthrottle(struct tty_struct * tty)
1775 {
1776         struct tty3270 *tp;
1777
1778         tp = tty->driver_data;
1779         if (!tp)
1780                 return;
1781         tp->throttle = 0;
1782         if (tp->attn)
1783                 tty3270_issue_read(tp, 1);
1784 }
1785
1786 /*
1787  * Hang up the tty device.
1788  */
1789 static void
1790 tty3270_hangup(struct tty_struct *tty)
1791 {
1792         // FIXME: implement
1793 }
1794
1795 static void
1796 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1797 {
1798 }
1799
1800 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1801                          unsigned long arg)
1802 {
1803         struct tty3270 *tp;
1804
1805         tp = tty->driver_data;
1806         if (!tp)
1807                 return -ENODEV;
1808         if (tty->flags & (1 << TTY_IO_ERROR))
1809                 return -EIO;
1810         return kbd_ioctl(tp->kbd, cmd, arg);
1811 }
1812
1813 #ifdef CONFIG_COMPAT
1814 static long tty3270_compat_ioctl(struct tty_struct *tty,
1815                                  unsigned int cmd, unsigned long arg)
1816 {
1817         struct tty3270 *tp;
1818
1819         tp = tty->driver_data;
1820         if (!tp)
1821                 return -ENODEV;
1822         if (tty->flags & (1 << TTY_IO_ERROR))
1823                 return -EIO;
1824         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1825 }
1826 #endif
1827
1828 static const struct tty_operations tty3270_ops = {
1829         .install = tty3270_install,
1830         .cleanup = tty3270_cleanup,
1831         .open = tty3270_open,
1832         .close = tty3270_close,
1833         .write = tty3270_write,
1834         .put_char = tty3270_put_char,
1835         .flush_chars = tty3270_flush_chars,
1836         .write_room = tty3270_write_room,
1837         .chars_in_buffer = tty3270_chars_in_buffer,
1838         .flush_buffer = tty3270_flush_buffer,
1839         .throttle = tty3270_throttle,
1840         .unthrottle = tty3270_unthrottle,
1841         .hangup = tty3270_hangup,
1842         .wait_until_sent = tty3270_wait_until_sent,
1843         .ioctl = tty3270_ioctl,
1844 #ifdef CONFIG_COMPAT
1845         .compat_ioctl = tty3270_compat_ioctl,
1846 #endif
1847         .set_termios = tty3270_set_termios
1848 };
1849
1850 static void tty3270_create_cb(int minor)
1851 {
1852         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1853 }
1854
1855 static void tty3270_destroy_cb(int minor)
1856 {
1857         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1858 }
1859
1860 static struct raw3270_notifier tty3270_notifier =
1861 {
1862         .create = tty3270_create_cb,
1863         .destroy = tty3270_destroy_cb,
1864 };
1865
1866 /*
1867  * 3270 tty registration code called from tty_init().
1868  * Most kernel services (incl. kmalloc) are available at this poimt.
1869  */
1870 static int __init tty3270_init(void)
1871 {
1872         struct tty_driver *driver;
1873         int ret;
1874
1875         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1876                                   TTY_DRIVER_REAL_RAW |
1877                                   TTY_DRIVER_DYNAMIC_DEV |
1878                                   TTY_DRIVER_RESET_TERMIOS);
1879         if (IS_ERR(driver))
1880                 return PTR_ERR(driver);
1881
1882         /*
1883          * Initialize the tty_driver structure
1884          * Entries in tty3270_driver that are NOT initialized:
1885          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1886          */
1887         driver->driver_name = "tty3270";
1888         driver->name = "3270/tty";
1889         driver->major = IBM_TTY3270_MAJOR;
1890         driver->minor_start = RAW3270_FIRSTMINOR;
1891         driver->name_base = RAW3270_FIRSTMINOR;
1892         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1893         driver->subtype = SYSTEM_TYPE_TTY;
1894         driver->init_termios = tty_std_termios;
1895         tty_set_operations(driver, &tty3270_ops);
1896         ret = tty_register_driver(driver);
1897         if (ret) {
1898                 put_tty_driver(driver);
1899                 return ret;
1900         }
1901         tty3270_driver = driver;
1902         raw3270_register_notifier(&tty3270_notifier);
1903         return 0;
1904 }
1905
1906 static void __exit
1907 tty3270_exit(void)
1908 {
1909         struct tty_driver *driver;
1910
1911         raw3270_unregister_notifier(&tty3270_notifier);
1912         driver = tty3270_driver;
1913         tty3270_driver = NULL;
1914         tty_unregister_driver(driver);
1915         put_tty_driver(driver);
1916         tty3270_del_views();
1917 }
1918
1919 MODULE_LICENSE("GPL");
1920 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1921
1922 module_init(tty3270_init);
1923 module_exit(tty3270_exit);