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         tty_kref_put(tty);
 842 }
 843
 844 static void
 845 tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
 846 {
 847         struct tty3270 *tp = container_of(view, struct tty3270, view);
 848
 849         tp->n_model = model;
 850         tp->n_rows = rows;
 851         tp->n_cols = cols;
 852         schedule_work(&tp->resize_work);
 853 }
 854
 855 /*
 856  * Unlink tty3270 data structure from tty.
 857  */
 858 static void
 859 tty3270_release(struct raw3270_view *view)
 860 {
 861         struct tty3270 *tp = container_of(view, struct tty3270, view);
 862         struct tty_struct *tty = tty_port_tty_get(&tp->port);
 863
 864         if (tty) {
 865                 tty->driver_data = NULL;
 866                 tty_port_tty_set(&tp->port, NULL);
 867                 tty_hangup(tty);
 868                 raw3270_put_view(&tp->view);
 869                 tty_kref_put(tty);
 870         }
 871 }
 872
 873 /*
 874  * Free tty3270 data structure
 875  */
 876 static void
 877 tty3270_free(struct raw3270_view *view)
 878 {
 879         struct tty3270 *tp = container_of(view, struct tty3270, view);
 880
 881         del_timer_sync(&tp->timer);
 882         tty3270_free_screen(tp->screen, tp->view.rows);
 883         tty3270_free_view(tp);
 884 }
 885
 886 /*
 887  * Delayed freeing of tty3270 views.
 888  */
 889 static void
 890 tty3270_del_views(void)
 891 {
 892         int i;
 893
 894         for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
 895                 struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
 896                 if (!IS_ERR(view))
 897                         raw3270_del_view(view);
 898         }
 899 }
 900
 901 static struct raw3270_fn tty3270_fn = {
 902         .activate = tty3270_activate,
 903         .deactivate = tty3270_deactivate,
 904         .intv = (void *) tty3270_irq,
 905         .release = tty3270_release,
 906         .free = tty3270_free,
 907         .resize = tty3270_resize
 908 };
 909
 910 /*
 911  * This routine is called whenever a 3270 tty is opened first time.
 912  */
 913 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 914 {
 915         struct raw3270_view *view;
 916         struct tty3270 *tp;
 917         int i, rc;
 918
 919         /* Check if the tty3270 is already there. */
 920         view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
 921         if (!IS_ERR(view)) {
 922                 tp = container_of(view, struct tty3270, view);
 923                 tty->driver_data = tp;
 924                 tty->winsize.ws_row = tp->view.rows - 2;
 925                 tty->winsize.ws_col = tp->view.cols;
 926                 tp->port.low_latency = 0;
 927                 tp->inattr = TF_INPUT;
 928                 goto port_install;
 929         }
 930         if (tty3270_max_index < tty->index + 1)
 931                 tty3270_max_index = tty->index + 1;
 932
 933         /* Allocate tty3270 structure on first open. */
 934         tp = tty3270_alloc_view();
 935         if (IS_ERR(tp))
 936                 return PTR_ERR(tp);
 937
 938         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 939                               tty->index + RAW3270_FIRSTMINOR);
 940         if (rc) {
 941                 tty3270_free_view(tp);
 942                 return rc;
 943         }
 944
 945         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 946         if (IS_ERR(tp->screen)) {
 947                 rc = PTR_ERR(tp->screen);
 948                 raw3270_put_view(&tp->view);
 949                 raw3270_del_view(&tp->view);
 950                 tty3270_free_view(tp);
 951                 return rc;
 952         }
 953
 954         tp->port.low_latency = 0;
 955         tty->winsize.ws_row = tp->view.rows - 2;
 956         tty->winsize.ws_col = tp->view.cols;
 957
 958         tty3270_create_prompt(tp);
 959         tty3270_create_status(tp);
 960         tty3270_update_status(tp);
 961
 962         /* Create blank line for every line in the tty output area. */
 963         for (i = 0; i < tp->view.rows - 2; i++)
 964                 tty3270_blank_line(tp);
 965
 966         tp->kbd->port = &tp->port;
 967         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
 968         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
 969         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
 970         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
 971         kbd_ascebc(tp->kbd, tp->view.ascebc);
 972
 973         raw3270_activate_view(&tp->view);
 974
 975 port_install:
 976         rc = tty_port_install(&tp->port, driver, tty);
 977         if (rc) {
 978                 raw3270_put_view(&tp->view);
 979                 return rc;
 980         }
 981
 982         tty->driver_data = tp;
 983
 984         return 0;
 985 }
 986
 987 /*
 988  * This routine is called whenever a 3270 tty is opened.
 989  */
 990 static int
 991 tty3270_open(struct tty_struct *tty, struct file *filp)
 992 {
 993         struct tty3270 *tp = tty->driver_data;
 994         struct tty_port *port = &tp->port;
 995
 996         port->count++;
 997         tty_port_tty_set(port, tty);
 998         return 0;
 999 }
1000
1001 /*
1002  * This routine is called when the 3270 tty is closed. We wait
1003  * for the remaining request to be completed. Then we clean up.
1004  */
1005 static void
1006 tty3270_close(struct tty_struct *tty, struct file * filp)
1007 {
1008         struct tty3270 *tp = tty->driver_data;
1009
1010         if (tty->count > 1)
1011                 return;
1012         if (tp)
1013                 tty_port_tty_set(&tp->port, NULL);
1014 }
1015
1016 static void tty3270_cleanup(struct tty_struct *tty)
1017 {
1018         struct tty3270 *tp = tty->driver_data;
1019
1020         if (tp) {
1021                 tty->driver_data = NULL;
1022                 raw3270_put_view(&tp->view);
1023         }
1024 }
1025
1026 /*
1027  * We always have room.
1028  */
1029 static int
1030 tty3270_write_room(struct tty_struct *tty)
1031 {
1032         return INT_MAX;
1033 }
1034
1035 /*
1036  * Insert character into the screen at the current position with the
1037  * current color and highlight. This function does NOT do cursor movement.
1038  */
1039 static void tty3270_put_character(struct tty3270 *tp, char ch)
1040 {
1041         struct tty3270_line *line;
1042         struct tty3270_cell *cell;
1043
1044         line = tp->screen + tp->cy;
1045         if (line->len <= tp->cx) {
1046                 while (line->len < tp->cx) {
1047                         cell = line->cells + line->len;
1048                         cell->character = tp->view.ascebc[' '];
1049                         cell->highlight = tp->highlight;
1050                         cell->f_color = tp->f_color;
1051                         line->len++;
1052                 }
1053                 line->len++;
1054         }
1055         cell = line->cells + tp->cx;
1056         cell->character = tp->view.ascebc[(unsigned int) ch];
1057         cell->highlight = tp->highlight;
1058         cell->f_color = tp->f_color;
1059 }
1060
1061 /*
1062  * Convert a tty3270_line to a 3270 data fragment usable for output.
1063  */
1064 static void
1065 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1066 {
1067         struct tty3270_line *line;
1068         struct tty3270_cell *cell;
1069         struct string *s, *n;
1070         unsigned char highlight;
1071         unsigned char f_color;
1072         char *cp;
1073         int flen, i;
1074
1075         /* Determine how long the fragment will be. */
1076         flen = 3;               /* Prefix (TO_SBA). */
1077         line = tp->screen + line_nr;
1078         flen += line->len;
1079         highlight = TAX_RESET;
1080         f_color = TAC_RESET;
1081         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1082                 if (cell->highlight != highlight) {
1083                         flen += 3;      /* TO_SA to switch highlight. */
1084                         highlight = cell->highlight;
1085                 }
1086                 if (cell->f_color != f_color) {
1087                         flen += 3;      /* TO_SA to switch color. */
1088                         f_color = cell->f_color;
1089                 }
1090         }
1091         if (highlight != TAX_RESET)
1092                 flen += 3;      /* TO_SA to reset hightlight. */
1093         if (f_color != TAC_RESET)
1094                 flen += 3;      /* TO_SA to reset color. */
1095         if (line->len < tp->view.cols)
1096                 flen += 4;      /* Postfix (TO_RA). */
1097
1098         /* Find the line in the list. */
1099         i = tp->view.rows - 2 - line_nr;
1100         list_for_each_entry_reverse(s, &tp->lines, list)
1101                 if (--i <= 0)
1102                         break;
1103         /*
1104          * Check if the line needs to get reallocated.
1105          */
1106         if (s->len != flen) {
1107                 /* Reallocate string. */
1108                 n = tty3270_alloc_string(tp, flen);
1109                 list_add(&n->list, &s->list);
1110                 list_del_init(&s->list);
1111                 if (!list_empty(&s->update))
1112                         list_del_init(&s->update);
1113                 free_string(&tp->freemem, s);
1114                 s = n;
1115         }
1116
1117         /* Write 3270 data fragment. */
1118         cp = s->string;
1119         *cp++ = TO_SBA;
1120         *cp++ = 0;
1121         *cp++ = 0;
1122
1123         highlight = TAX_RESET;
1124         f_color = TAC_RESET;
1125         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1126                 if (cell->highlight != highlight) {
1127                         *cp++ = TO_SA;
1128                         *cp++ = TAT_EXTHI;
1129                         *cp++ = cell->highlight;
1130                         highlight = cell->highlight;
1131                 }
1132                 if (cell->f_color != f_color) {
1133                         *cp++ = TO_SA;
1134                         *cp++ = TAT_COLOR;
1135                         *cp++ = cell->f_color;
1136                         f_color = cell->f_color;
1137                 }
1138                 *cp++ = cell->character;
1139         }
1140         if (highlight != TAX_RESET) {
1141                 *cp++ = TO_SA;
1142                 *cp++ = TAT_EXTHI;
1143                 *cp++ = TAX_RESET;
1144         }
1145         if (f_color != TAC_RESET) {
1146                 *cp++ = TO_SA;
1147                 *cp++ = TAT_COLOR;
1148                 *cp++ = TAC_RESET;
1149         }
1150         if (line->len < tp->view.cols) {
1151                 *cp++ = TO_RA;
1152                 *cp++ = 0;
1153                 *cp++ = 0;
1154                 *cp++ = 0;
1155         }
1156
1157         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1158                 /* Line is currently visible on screen. */
1159                 tty3270_update_string(tp, s, line_nr);
1160                 /* Add line to update list. */
1161                 if (list_empty(&s->update)) {
1162                         list_add_tail(&s->update, &tp->update);
1163                         tp->update_flags |= TTY_UPDATE_LIST;
1164                 }
1165         }
1166 }
1167
1168 /*
1169  * Do carriage return.
1170  */
1171 static void
1172 tty3270_cr(struct tty3270 *tp)
1173 {
1174         tp->cx = 0;
1175 }
1176
1177 /*
1178  * Do line feed.
1179  */
1180 static void
1181 tty3270_lf(struct tty3270 *tp)
1182 {
1183         struct tty3270_line temp;
1184         int i;
1185
1186         tty3270_convert_line(tp, tp->cy);
1187         if (tp->cy < tp->view.rows - 3) {
1188                 tp->cy++;
1189                 return;
1190         }
1191         /* Last line just filled up. Add new, blank line. */
1192         tty3270_blank_line(tp);
1193         temp = tp->screen[0];
1194         temp.len = 0;
1195         for (i = 0; i < tp->view.rows - 3; i++)
1196                 tp->screen[i] = tp->screen[i+1];
1197         tp->screen[tp->view.rows - 3] = temp;
1198         tty3270_rebuild_update(tp);
1199 }
1200
1201 static void
1202 tty3270_ri(struct tty3270 *tp)
1203 {
1204         if (tp->cy > 0) {
1205             tty3270_convert_line(tp, tp->cy);
1206             tp->cy--;
1207         }
1208 }
1209
1210 /*
1211  * Insert characters at current position.
1212  */
1213 static void
1214 tty3270_insert_characters(struct tty3270 *tp, int n)
1215 {
1216         struct tty3270_line *line;
1217         int k;
1218
1219         line = tp->screen + tp->cy;
1220         while (line->len < tp->cx) {
1221                 line->cells[line->len].character = tp->view.ascebc[' '];
1222                 line->cells[line->len].highlight = TAX_RESET;
1223                 line->cells[line->len].f_color = TAC_RESET;
1224                 line->len++;
1225         }
1226         if (n > tp->view.cols - tp->cx)
1227                 n = tp->view.cols - tp->cx;
1228         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1229         while (k--)
1230                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1231         line->len += n;
1232         if (line->len > tp->view.cols)
1233                 line->len = tp->view.cols;
1234         while (n-- > 0) {
1235                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1236                 line->cells[tp->cx + n].highlight = tp->highlight;
1237                 line->cells[tp->cx + n].f_color = tp->f_color;
1238         }
1239 }
1240
1241 /*
1242  * Delete characters at current position.
1243  */
1244 static void
1245 tty3270_delete_characters(struct tty3270 *tp, int n)
1246 {
1247         struct tty3270_line *line;
1248         int i;
1249
1250         line = tp->screen + tp->cy;
1251         if (line->len <= tp->cx)
1252                 return;
1253         if (line->len - tp->cx <= n) {
1254                 line->len = tp->cx;
1255                 return;
1256         }
1257         for (i = tp->cx; i + n < line->len; i++)
1258                 line->cells[i] = line->cells[i + n];
1259         line->len -= n;
1260 }
1261
1262 /*
1263  * Erase characters at current position.
1264  */
1265 static void
1266 tty3270_erase_characters(struct tty3270 *tp, int n)
1267 {
1268         struct tty3270_line *line;
1269         struct tty3270_cell *cell;
1270
1271         line = tp->screen + tp->cy;
1272         while (line->len > tp->cx && n-- > 0) {
1273                 cell = line->cells + tp->cx++;
1274                 cell->character = ' ';
1275                 cell->highlight = TAX_RESET;
1276                 cell->f_color = TAC_RESET;
1277         }
1278         tp->cx += n;
1279         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1280 }
1281
1282 /*
1283  * Erase line, 3 different cases:
1284  *  Esc [ 0 K   Erase from current position to end of line inclusive
1285  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1286  *  Esc [ 2 K   Erase entire line (without moving cursor)
1287  */
1288 static void
1289 tty3270_erase_line(struct tty3270 *tp, int mode)
1290 {
1291         struct tty3270_line *line;
1292         struct tty3270_cell *cell;
1293         int i;
1294
1295         line = tp->screen + tp->cy;
1296         if (mode == 0)
1297                 line->len = tp->cx;
1298         else if (mode == 1) {
1299                 for (i = 0; i < tp->cx; i++) {
1300                         cell = line->cells + i;
1301                         cell->character = ' ';
1302                         cell->highlight = TAX_RESET;
1303                         cell->f_color = TAC_RESET;
1304                 }
1305                 if (line->len <= tp->cx)
1306                         line->len = tp->cx + 1;
1307         } else if (mode == 2)
1308                 line->len = 0;
1309         tty3270_convert_line(tp, tp->cy);
1310 }
1311
1312 /*
1313  * Erase display, 3 different cases:
1314  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1315  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1316  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1317  */
1318 static void
1319 tty3270_erase_display(struct tty3270 *tp, int mode)
1320 {
1321         int i;
1322
1323         if (mode == 0) {
1324                 tty3270_erase_line(tp, 0);
1325                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1326                         tp->screen[i].len = 0;
1327                         tty3270_convert_line(tp, i);
1328                 }
1329         } else if (mode == 1) {
1330                 for (i = 0; i < tp->cy; i++) {
1331                         tp->screen[i].len = 0;
1332                         tty3270_convert_line(tp, i);
1333                 }
1334                 tty3270_erase_line(tp, 1);
1335         } else if (mode == 2) {
1336                 for (i = 0; i < tp->view.rows - 2; i++) {
1337                         tp->screen[i].len = 0;
1338                         tty3270_convert_line(tp, i);
1339                 }
1340         }
1341         tty3270_rebuild_update(tp);
1342 }
1343
1344 /*
1345  * Set attributes found in an escape sequence.
1346  *  Esc [ <attr> ; <attr> ; ... m
1347  */
1348 static void
1349 tty3270_set_attributes(struct tty3270 *tp)
1350 {
1351         static unsigned char f_colors[] = {
1352                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1353                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1354         };
1355         int i, attr;
1356
1357         for (i = 0; i <= tp->esc_npar; i++) {
1358                 attr = tp->esc_par[i];
1359                 switch (attr) {
1360                 case 0:         /* Reset */
1361                         tp->highlight = TAX_RESET;
1362                         tp->f_color = TAC_RESET;
1363                         break;
1364                 /* Highlight. */
1365                 case 4:         /* Start underlining. */
1366                         tp->highlight = TAX_UNDER;
1367                         break;
1368                 case 5:         /* Start blink. */
1369                         tp->highlight = TAX_BLINK;
1370                         break;
1371                 case 7:         /* Start reverse. */
1372                         tp->highlight = TAX_REVER;
1373                         break;
1374                 case 24:        /* End underlining */
1375                         if (tp->highlight == TAX_UNDER)
1376                                 tp->highlight = TAX_RESET;
1377                         break;
1378                 case 25:        /* End blink. */
1379                         if (tp->highlight == TAX_BLINK)
1380                                 tp->highlight = TAX_RESET;
1381                         break;
1382                 case 27:        /* End reverse. */
1383                         if (tp->highlight == TAX_REVER)
1384                                 tp->highlight = TAX_RESET;
1385                         break;
1386                 /* Foreground color. */
1387                 case 30:        /* Black */
1388                 case 31:        /* Red */
1389                 case 32:        /* Green */
1390                 case 33:        /* Yellow */
1391                 case 34:        /* Blue */
1392                 case 35:        /* Magenta */
1393                 case 36:        /* Cyan */
1394                 case 37:        /* White */
1395                 case 39:        /* Black */
1396                         tp->f_color = f_colors[attr - 30];
1397                         break;
1398                 }
1399         }
1400 }
1401
1402 static inline int
1403 tty3270_getpar(struct tty3270 *tp, int ix)
1404 {
1405         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1406 }
1407
1408 static void
1409 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1410 {
1411         int max_cx = max(0, cx);
1412         int max_cy = max(0, cy);
1413
1414         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1415         cy = min_t(int, tp->view.rows - 3, max_cy);
1416         if (cy != tp->cy) {
1417                 tty3270_convert_line(tp, tp->cy);
1418                 tp->cy = cy;
1419         }
1420 }
1421
1422 /*
1423  * Process escape sequences. Known sequences:
1424  *  Esc 7                       Save Cursor Position
1425  *  Esc 8                       Restore Cursor Position
1426  *  Esc [ Pn ; Pn ; .. m        Set attributes
1427  *  Esc [ Pn ; Pn H             Cursor Position
1428  *  Esc [ Pn ; Pn f             Cursor Position
1429  *  Esc [ Pn A                  Cursor Up
1430  *  Esc [ Pn B                  Cursor Down
1431  *  Esc [ Pn C                  Cursor Forward
1432  *  Esc [ Pn D                  Cursor Backward
1433  *  Esc [ Pn G                  Cursor Horizontal Absolute
1434  *  Esc [ Pn X                  Erase Characters
1435  *  Esc [ Ps J                  Erase in Display
1436  *  Esc [ Ps K                  Erase in Line
1437  * // FIXME: add all the new ones.
1438  *
1439  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1440  *  Ps is a selective parameter.
1441  */
1442 static void
1443 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1444 {
1445         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1446
1447         if (tp->esc_state == ESnormal) {
1448                 if (ch == 0x1b)
1449                         /* Starting new escape sequence. */
1450                         tp->esc_state = ESesc;
1451                 return;
1452         }
1453         if (tp->esc_state == ESesc) {
1454                 tp->esc_state = ESnormal;
1455                 switch (ch) {
1456                 case '[':
1457                         tp->esc_state = ESsquare;
1458                         break;
1459                 case 'E':
1460                         tty3270_cr(tp);
1461                         tty3270_lf(tp);
1462                         break;
1463                 case 'M':
1464                         tty3270_ri(tp);
1465                         break;
1466                 case 'D':
1467                         tty3270_lf(tp);
1468                         break;
1469                 case 'Z':               /* Respond ID. */
1470                         kbd_puts_queue(&tp->port, "\033[?6c");
1471                         break;
1472                 case '7':               /* Save cursor position. */
1473                         tp->saved_cx = tp->cx;
1474                         tp->saved_cy = tp->cy;
1475                         tp->saved_highlight = tp->highlight;
1476                         tp->saved_f_color = tp->f_color;
1477                         break;
1478                 case '8':               /* Restore cursor position. */
1479                         tty3270_convert_line(tp, tp->cy);
1480                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1481                         tp->highlight = tp->saved_highlight;
1482                         tp->f_color = tp->saved_f_color;
1483                         break;
1484                 case 'c':               /* Reset terminal. */
1485                         tp->cx = tp->saved_cx = 0;
1486                         tp->cy = tp->saved_cy = 0;
1487                         tp->highlight = tp->saved_highlight = TAX_RESET;
1488                         tp->f_color = tp->saved_f_color = TAC_RESET;
1489                         tty3270_erase_display(tp, 2);
1490                         break;
1491                 }
1492                 return;
1493         }
1494         if (tp->esc_state == ESsquare) {
1495                 tp->esc_state = ESgetpars;
1496                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1497                 tp->esc_npar = 0;
1498                 tp->esc_ques = (ch == '?');
1499                 if (tp->esc_ques)
1500                         return;
1501         }
1502         if (tp->esc_state == ESgetpars) {
1503                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1504                         tp->esc_npar++;
1505                         return;
1506                 }
1507                 if (ch >= '0' && ch <= '9') {
1508                         tp->esc_par[tp->esc_npar] *= 10;
1509                         tp->esc_par[tp->esc_npar] += ch - '0';
1510                         return;
1511                 }
1512         }
1513         tp->esc_state = ESnormal;
1514         if (ch == 'n' && !tp->esc_ques) {
1515                 if (tp->esc_par[0] == 5)                /* Status report. */
1516                         kbd_puts_queue(&tp->port, "\033[0n");
1517                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1518                         char buf[40];
1519                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1520                         kbd_puts_queue(&tp->port, buf);
1521                 }
1522                 return;
1523         }
1524         if (tp->esc_ques)
1525                 return;
1526         switch (ch) {
1527         case 'm':
1528                 tty3270_set_attributes(tp);
1529                 break;
1530         case 'H':       /* Set cursor position. */
1531         case 'f':
1532                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1533                                 tty3270_getpar(tp, 0) - 1);
1534                 break;
1535         case 'd':       /* Set y position. */
1536                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1537                 break;
1538         case 'A':       /* Cursor up. */
1539         case 'F':
1540                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1541                 break;
1542         case 'B':       /* Cursor down. */
1543         case 'e':
1544         case 'E':
1545                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1546                 break;
1547         case 'C':       /* Cursor forward. */
1548         case 'a':
1549                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1550                 break;
1551         case 'D':       /* Cursor backward. */
1552                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1553                 break;
1554         case 'G':       /* Set x position. */
1555         case '`':
1556                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1557                 break;
1558         case 'X':       /* Erase Characters. */
1559                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1560                 break;
1561         case 'J':       /* Erase display. */
1562                 tty3270_erase_display(tp, tp->esc_par[0]);
1563                 break;
1564         case 'K':       /* Erase line. */
1565                 tty3270_erase_line(tp, tp->esc_par[0]);
1566                 break;
1567         case 'P':       /* Delete characters. */
1568                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1569                 break;
1570         case '@':       /* Insert characters. */
1571                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1572                 break;
1573         case 's':       /* Save cursor position. */
1574                 tp->saved_cx = tp->cx;
1575                 tp->saved_cy = tp->cy;
1576                 tp->saved_highlight = tp->highlight;
1577                 tp->saved_f_color = tp->f_color;
1578                 break;
1579         case 'u':       /* Restore cursor position. */
1580                 tty3270_convert_line(tp, tp->cy);
1581                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1582                 tp->highlight = tp->saved_highlight;
1583                 tp->f_color = tp->saved_f_color;
1584                 break;
1585         }
1586 }
1587
1588 /*
1589  * String write routine for 3270 ttys
1590  */
1591 static void
1592 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1593                 const unsigned char *buf, int count)
1594 {
1595         int i_msg, i;
1596
1597         spin_lock_bh(&tp->view.lock);
1598         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1599                 if (tp->esc_state != 0) {
1600                         /* Continue escape sequence. */
1601                         tty3270_escape_sequence(tp, buf[i_msg]);
1602                         continue;
1603                 }
1604
1605                 switch (buf[i_msg]) {
1606                 case 0x07:              /* '\a' -- Alarm */
1607                         tp->wcc |= TW_PLUSALARM;
1608                         break;
1609                 case 0x08:              /* Backspace. */
1610                         if (tp->cx > 0) {
1611                                 tp->cx--;
1612                                 tty3270_put_character(tp, ' ');
1613                         }
1614                         break;
1615                 case 0x09:              /* '\t' -- Tabulate */
1616                         for (i = tp->cx % 8; i < 8; i++) {
1617                                 if (tp->cx >= tp->view.cols) {
1618                                         tty3270_cr(tp);
1619                                         tty3270_lf(tp);
1620                                         break;
1621                                 }
1622                                 tty3270_put_character(tp, ' ');
1623                                 tp->cx++;
1624                         }
1625                         break;
1626                 case 0x0a:              /* '\n' -- New Line */
1627                         tty3270_cr(tp);
1628                         tty3270_lf(tp);
1629                         break;
1630                 case 0x0c:              /* '\f' -- Form Feed */
1631                         tty3270_erase_display(tp, 2);
1632                         tp->cx = tp->cy = 0;
1633                         break;
1634                 case 0x0d:              /* '\r' -- Carriage Return */
1635                         tp->cx = 0;
1636                         break;
1637                 case 0x0f:              /* SuSE "exit alternate mode" */
1638                         break;
1639                 case 0x1b:              /* Start escape sequence. */
1640                         tty3270_escape_sequence(tp, buf[i_msg]);
1641                         break;
1642                 default:                /* Insert normal character. */
1643                         if (tp->cx >= tp->view.cols) {
1644                                 tty3270_cr(tp);
1645                                 tty3270_lf(tp);
1646                         }
1647                         tty3270_put_character(tp, buf[i_msg]);
1648                         tp->cx++;
1649                         break;
1650                 }
1651         }
1652         /* Convert current line to 3270 data fragment. */
1653         tty3270_convert_line(tp, tp->cy);
1654
1655         /* Setup timer to update display after 1/10 second */
1656         if (!timer_pending(&tp->timer))
1657                 tty3270_set_timer(tp, HZ/10);
1658
1659         spin_unlock_bh(&tp->view.lock);
1660 }
1661
1662 /*
1663  * String write routine for 3270 ttys
1664  */
1665 static int
1666 tty3270_write(struct tty_struct * tty,
1667               const unsigned char *buf, int count)
1668 {
1669         struct tty3270 *tp;
1670
1671         tp = tty->driver_data;
1672         if (!tp)
1673                 return 0;
1674         if (tp->char_count > 0) {
1675                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1676                 tp->char_count = 0;
1677         }
1678         tty3270_do_write(tp, tty, buf, count);
1679         return count;
1680 }
1681
1682 /*
1683  * Put single characters to the ttys character buffer
1684  */
1685 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1686 {
1687         struct tty3270 *tp;
1688
1689         tp = tty->driver_data;
1690         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1691                 return 0;
1692         tp->char_buf[tp->char_count++] = ch;
1693         return 1;
1694 }
1695
1696 /*
1697  * Flush all characters from the ttys characeter buffer put there
1698  * by tty3270_put_char.
1699  */
1700 static void
1701 tty3270_flush_chars(struct tty_struct *tty)
1702 {
1703         struct tty3270 *tp;
1704
1705         tp = tty->driver_data;
1706         if (!tp)
1707                 return;
1708         if (tp->char_count > 0) {
1709                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1710                 tp->char_count = 0;
1711         }
1712 }
1713
1714 /*
1715  * Returns the number of characters in the output buffer. This is
1716  * used in tty_wait_until_sent to wait until all characters have
1717  * appeared on the screen.
1718  */
1719 static int
1720 tty3270_chars_in_buffer(struct tty_struct *tty)
1721 {
1722         return 0;
1723 }
1724
1725 static void
1726 tty3270_flush_buffer(struct tty_struct *tty)
1727 {
1728 }
1729
1730 /*
1731  * Check for visible/invisible input switches
1732  */
1733 static void
1734 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1735 {
1736         struct tty3270 *tp;
1737         int new;
1738
1739         tp = tty->driver_data;
1740         if (!tp)
1741                 return;
1742         spin_lock_bh(&tp->view.lock);
1743         if (L_ICANON(tty)) {
1744                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1745                 if (new != tp->inattr) {
1746                         tp->inattr = new;
1747                         tty3270_update_prompt(tp, NULL, 0);
1748                         tty3270_set_timer(tp, 1);
1749                 }
1750         }
1751         spin_unlock_bh(&tp->view.lock);
1752 }
1753
1754 /*
1755  * Disable reading from a 3270 tty
1756  */
1757 static void
1758 tty3270_throttle(struct tty_struct * tty)
1759 {
1760         struct tty3270 *tp;
1761
1762         tp = tty->driver_data;
1763         if (!tp)
1764                 return;
1765         tp->throttle = 1;
1766 }
1767
1768 /*
1769  * Enable reading from a 3270 tty
1770  */
1771 static void
1772 tty3270_unthrottle(struct tty_struct * tty)
1773 {
1774         struct tty3270 *tp;
1775
1776         tp = tty->driver_data;
1777         if (!tp)
1778                 return;
1779         tp->throttle = 0;
1780         if (tp->attn)
1781                 tty3270_issue_read(tp, 1);
1782 }
1783
1784 /*
1785  * Hang up the tty device.
1786  */
1787 static void
1788 tty3270_hangup(struct tty_struct *tty)
1789 {
1790         // FIXME: implement
1791 }
1792
1793 static void
1794 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1795 {
1796 }
1797
1798 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1799                          unsigned long arg)
1800 {
1801         struct tty3270 *tp;
1802
1803         tp = tty->driver_data;
1804         if (!tp)
1805                 return -ENODEV;
1806         if (tty->flags & (1 << TTY_IO_ERROR))
1807                 return -EIO;
1808         return kbd_ioctl(tp->kbd, cmd, arg);
1809 }
1810
1811 #ifdef CONFIG_COMPAT
1812 static long tty3270_compat_ioctl(struct tty_struct *tty,
1813                                  unsigned int cmd, unsigned long arg)
1814 {
1815         struct tty3270 *tp;
1816
1817         tp = tty->driver_data;
1818         if (!tp)
1819                 return -ENODEV;
1820         if (tty->flags & (1 << TTY_IO_ERROR))
1821                 return -EIO;
1822         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1823 }
1824 #endif
1825
1826 static const struct tty_operations tty3270_ops = {
1827         .install = tty3270_install,
1828         .cleanup = tty3270_cleanup,
1829         .open = tty3270_open,
1830         .close = tty3270_close,
1831         .write = tty3270_write,
1832         .put_char = tty3270_put_char,
1833         .flush_chars = tty3270_flush_chars,
1834         .write_room = tty3270_write_room,
1835         .chars_in_buffer = tty3270_chars_in_buffer,
1836         .flush_buffer = tty3270_flush_buffer,
1837         .throttle = tty3270_throttle,
1838         .unthrottle = tty3270_unthrottle,
1839         .hangup = tty3270_hangup,
1840         .wait_until_sent = tty3270_wait_until_sent,
1841         .ioctl = tty3270_ioctl,
1842 #ifdef CONFIG_COMPAT
1843         .compat_ioctl = tty3270_compat_ioctl,
1844 #endif
1845         .set_termios = tty3270_set_termios
1846 };
1847
1848 static void tty3270_create_cb(int minor)
1849 {
1850         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1851 }
1852
1853 static void tty3270_destroy_cb(int minor)
1854 {
1855         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1856 }
1857
1858 static struct raw3270_notifier tty3270_notifier =
1859 {
1860         .create = tty3270_create_cb,
1861         .destroy = tty3270_destroy_cb,
1862 };
1863
1864 /*
1865  * 3270 tty registration code called from tty_init().
1866  * Most kernel services (incl. kmalloc) are available at this poimt.
1867  */
1868 static int __init tty3270_init(void)
1869 {
1870         struct tty_driver *driver;
1871         int ret;
1872
1873         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1874                                   TTY_DRIVER_REAL_RAW |
1875                                   TTY_DRIVER_DYNAMIC_DEV |
1876                                   TTY_DRIVER_RESET_TERMIOS);
1877         if (IS_ERR(driver))
1878                 return PTR_ERR(driver);
1879
1880         /*
1881          * Initialize the tty_driver structure
1882          * Entries in tty3270_driver that are NOT initialized:
1883          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1884          */
1885         driver->driver_name = "tty3270";
1886         driver->name = "3270/tty";
1887         driver->major = IBM_TTY3270_MAJOR;
1888         driver->minor_start = RAW3270_FIRSTMINOR;
1889         driver->name_base = RAW3270_FIRSTMINOR;
1890         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1891         driver->subtype = SYSTEM_TYPE_TTY;
1892         driver->init_termios = tty_std_termios;
1893         tty_set_operations(driver, &tty3270_ops);
1894         ret = tty_register_driver(driver);
1895         if (ret) {
1896                 put_tty_driver(driver);
1897                 return ret;
1898         }
1899         tty3270_driver = driver;
1900         raw3270_register_notifier(&tty3270_notifier);
1901         return 0;
1902 }
1903
1904 static void __exit
1905 tty3270_exit(void)
1906 {
1907         struct tty_driver *driver;
1908
1909         raw3270_unregister_notifier(&tty3270_notifier);
1910         driver = tty3270_driver;
1911         tty3270_driver = NULL;
1912         tty_unregister_driver(driver);
1913         put_tty_driver(driver);
1914         tty3270_del_views();
1915 }
1916
1917 MODULE_LICENSE("GPL");
1918 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1919
1920 module_init(tty3270_init);
1921 module_exit(tty3270_exit);