kernel/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         }
 663         return RAW3270_IO_DONE;
 664 }
 665
 666 /*
 667  * Allocate tty3270 structure.
 668  */
 669 static struct tty3270 *
 670 tty3270_alloc_view(void)
 671 {
 672         struct tty3270 *tp;
 673         int pages;
 674
 675         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
 676         if (!tp)
 677                 goto out_err;
 678         tp->freemem_pages =
 679                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 680         if (!tp->freemem_pages)
 681                 goto out_tp;
 682         INIT_LIST_HEAD(&tp->freemem);
 683         INIT_LIST_HEAD(&tp->lines);
 684         INIT_LIST_HEAD(&tp->update);
 685         INIT_LIST_HEAD(&tp->rcl_lines);
 686         tp->rcl_max = 20;
 687
 688         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 689                 tp->freemem_pages[pages] = (void *)
 690                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 691                 if (!tp->freemem_pages[pages])
 692                         goto out_pages;
 693                 add_string_memory(&tp->freemem,
 694                                   tp->freemem_pages[pages], PAGE_SIZE);
 695         }
 696         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 697         if (IS_ERR(tp->write))
 698                 goto out_pages;
 699         tp->read = raw3270_request_alloc(0);
 700         if (IS_ERR(tp->read))
 701                 goto out_write;
 702         tp->kreset = raw3270_request_alloc(1);
 703         if (IS_ERR(tp->kreset))
 704                 goto out_read;
 705         tp->kbd = kbd_alloc();
 706         if (!tp->kbd)
 707                 goto out_reset;
 708
 709         tty_port_init(&tp->port);
 710         setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update,
 711                     (unsigned long) tp);
 712         tasklet_init(&tp->readlet,
 713                      (void (*)(unsigned long)) tty3270_read_tasklet,
 714                      (unsigned long) tp->read);
 715         INIT_WORK(&tp->resize_work, tty3270_resize_work);
 716
 717         return tp;
 718
 719 out_reset:
 720         raw3270_request_free(tp->kreset);
 721 out_read:
 722         raw3270_request_free(tp->read);
 723 out_write:
 724         raw3270_request_free(tp->write);
 725 out_pages:
 726         while (pages--)
 727                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 728         kfree(tp->freemem_pages);
 729         tty_port_destroy(&tp->port);
 730 out_tp:
 731         kfree(tp);
 732 out_err:
 733         return ERR_PTR(-ENOMEM);
 734 }
 735
 736 /*
 737  * Free tty3270 structure.
 738  */
 739 static void
 740 tty3270_free_view(struct tty3270 *tp)
 741 {
 742         int pages;
 743
 744         kbd_free(tp->kbd);
 745         raw3270_request_free(tp->kreset);
 746         raw3270_request_free(tp->read);
 747         raw3270_request_free(tp->write);
 748         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 749                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 750         kfree(tp->freemem_pages);
 751         tty_port_destroy(&tp->port);
 752         kfree(tp);
 753 }
 754
 755 /*
 756  * Allocate tty3270 screen.
 757  */
 758 static struct tty3270_line *
 759 tty3270_alloc_screen(unsigned int rows, unsigned int cols)
 760 {
 761         struct tty3270_line *screen;
 762         unsigned long size;
 763         int lines;
 764
 765         size = sizeof(struct tty3270_line) * (rows - 2);
 766         screen = kzalloc(size, GFP_KERNEL);
 767         if (!screen)
 768                 goto out_err;
 769         for (lines = 0; lines < rows - 2; lines++) {
 770                 size = sizeof(struct tty3270_cell) * cols;
 771                 screen[lines].cells = kzalloc(size, GFP_KERNEL);
 772                 if (!screen[lines].cells)
 773                         goto out_screen;
 774         }
 775         return screen;
 776 out_screen:
 777         while (lines--)
 778                 kfree(screen[lines].cells);
 779         kfree(screen);
 780 out_err:
 781         return ERR_PTR(-ENOMEM);
 782 }
 783
 784 /*
 785  * Free tty3270 screen.
 786  */
 787 static void
 788 tty3270_free_screen(struct tty3270_line *screen, unsigned int rows)
 789 {
 790         int lines;
 791
 792         for (lines = 0; lines < rows - 2; lines++)
 793                 kfree(screen[lines].cells);
 794         kfree(screen);
 795 }
 796
 797 /*
 798  * Resize tty3270 screen
 799  */
 800 static void tty3270_resize_work(struct work_struct *work)
 801 {
 802         struct tty3270 *tp = container_of(work, struct tty3270, resize_work);
 803         struct tty3270_line *screen, *oscreen;
 804         struct tty_struct *tty;
 805         unsigned int orows;
 806         struct winsize ws;
 807
 808         screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
 809         if (IS_ERR(screen))
 810                 return;
 811         /* Switch to new output size */
 812         spin_lock_bh(&tp->view.lock);
 813         oscreen = tp->screen;
 814         orows = tp->view.rows;
 815         tp->view.model = tp->n_model;
 816         tp->view.rows = tp->n_rows;
 817         tp->view.cols = tp->n_cols;
 818         tp->screen = screen;
 819         free_string(&tp->freemem, tp->prompt);
 820         free_string(&tp->freemem, tp->status);
 821         tty3270_create_prompt(tp);
 822         tty3270_create_status(tp);
 823         tp->nr_up = 0;
 824         while (tp->nr_lines < tp->view.rows - 2)
 825                 tty3270_blank_line(tp);
 826         tp->update_flags = TTY_UPDATE_ALL;
 827         spin_unlock_bh(&tp->view.lock);
 828         tty3270_free_screen(oscreen, orows);
 829         tty3270_set_timer(tp, 1);
 830         /* Informat tty layer about new size */
 831         tty = tty_port_tty_get(&tp->port);
 832         if (!tty)
 833                 return;
 834         ws.ws_row = tp->view.rows - 2;
 835         ws.ws_col = tp->view.cols;
 836         tty_do_resize(tty, &ws);
 837 }
 838
 839 static void
 840 tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
 841 {
 842         struct tty3270 *tp = container_of(view, struct tty3270, view);
 843
 844         tp->n_model = model;
 845         tp->n_rows = rows;
 846         tp->n_cols = cols;
 847         schedule_work(&tp->resize_work);
 848 }
 849
 850 /*
 851  * Unlink tty3270 data structure from tty.
 852  */
 853 static void
 854 tty3270_release(struct raw3270_view *view)
 855 {
 856         struct tty3270 *tp = container_of(view, struct tty3270, view);
 857         struct tty_struct *tty = tty_port_tty_get(&tp->port);
 858
 859         if (tty) {
 860                 tty->driver_data = NULL;
 861                 tty_port_tty_set(&tp->port, NULL);
 862                 tty_hangup(tty);
 863                 raw3270_put_view(&tp->view);
 864                 tty_kref_put(tty);
 865         }
 866 }
 867
 868 /*
 869  * Free tty3270 data structure
 870  */
 871 static void
 872 tty3270_free(struct raw3270_view *view)
 873 {
 874         struct tty3270 *tp = container_of(view, struct tty3270, view);
 875
 876         del_timer_sync(&tp->timer);
 877         tty3270_free_screen(tp->screen, tp->view.rows);
 878         tty3270_free_view(tp);
 879 }
 880
 881 /*
 882  * Delayed freeing of tty3270 views.
 883  */
 884 static void
 885 tty3270_del_views(void)
 886 {
 887         int i;
 888
 889         for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
 890                 struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
 891                 if (!IS_ERR(view))
 892                         raw3270_del_view(view);
 893         }
 894 }
 895
 896 static struct raw3270_fn tty3270_fn = {
 897         .activate = tty3270_activate,
 898         .deactivate = tty3270_deactivate,
 899         .intv = (void *) tty3270_irq,
 900         .release = tty3270_release,
 901         .free = tty3270_free,
 902         .resize = tty3270_resize
 903 };
 904
 905 /*
 906  * This routine is called whenever a 3270 tty is opened first time.
 907  */
 908 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 909 {
 910         struct raw3270_view *view;
 911         struct tty3270 *tp;
 912         int i, rc;
 913
 914         /* Check if the tty3270 is already there. */
 915         view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
 916         if (!IS_ERR(view)) {
 917                 tp = container_of(view, struct tty3270, view);
 918                 tty->driver_data = tp;
 919                 tty->winsize.ws_row = tp->view.rows - 2;
 920                 tty->winsize.ws_col = tp->view.cols;
 921                 tp->port.low_latency = 0;
 922                 /* why to reassign? */
 923                 tty_port_tty_set(&tp->port, tty);
 924                 tp->inattr = TF_INPUT;
 925                 return tty_port_install(&tp->port, driver, tty);
 926         }
 927         if (tty3270_max_index < tty->index + 1)
 928                 tty3270_max_index = tty->index + 1;
 929
 930         /* Allocate tty3270 structure on first open. */
 931         tp = tty3270_alloc_view();
 932         if (IS_ERR(tp))
 933                 return PTR_ERR(tp);
 934
 935         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 936                               tty->index + RAW3270_FIRSTMINOR);
 937         if (rc) {
 938                 tty3270_free_view(tp);
 939                 return rc;
 940         }
 941
 942         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 943         if (IS_ERR(tp->screen)) {
 944                 rc = PTR_ERR(tp->screen);
 945                 raw3270_put_view(&tp->view);
 946                 raw3270_del_view(&tp->view);
 947                 tty3270_free_view(tp);
 948                 return rc;
 949         }
 950
 951         tty_port_tty_set(&tp->port, tty);
 952         tp->port.low_latency = 0;
 953         tty->winsize.ws_row = tp->view.rows - 2;
 954         tty->winsize.ws_col = tp->view.cols;
 955
 956         tty3270_create_prompt(tp);
 957         tty3270_create_status(tp);
 958         tty3270_update_status(tp);
 959
 960         /* Create blank line for every line in the tty output area. */
 961         for (i = 0; i < tp->view.rows - 2; i++)
 962                 tty3270_blank_line(tp);
 963
 964         tp->kbd->port = &tp->port;
 965         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
 966         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
 967         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
 968         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
 969         kbd_ascebc(tp->kbd, tp->view.ascebc);
 970
 971         raw3270_activate_view(&tp->view);
 972
 973         rc = tty_port_install(&tp->port, driver, tty);
 974         if (rc) {
 975                 raw3270_put_view(&tp->view);
 976                 return rc;
 977         }
 978
 979         tty->driver_data = tp;
 980
 981         return 0;
 982 }
 983
 984 /*
 985  * This routine is called whenever a 3270 tty is opened.
 986  */
 987 static int
 988 tty3270_open(struct tty_struct *tty, struct file *filp)
 989 {
 990         struct tty3270 *tp = tty->driver_data;
 991         struct tty_port *port = &tp->port;
 992
 993         port->count++;
 994         tty_port_tty_set(port, tty);
 995         return 0;
 996 }
 997
 998 /*
 999  * This routine is called when the 3270 tty is closed. We wait
1000  * for the remaining request to be completed. Then we clean up.
1001  */
1002 static void
1003 tty3270_close(struct tty_struct *tty, struct file * filp)
1004 {
1005         struct tty3270 *tp = tty->driver_data;
1006
1007         if (tty->count > 1)
1008                 return;
1009         if (tp) {
1010                 tty->driver_data = NULL;
1011                 tty_port_tty_set(&tp->port, NULL);
1012         }
1013 }
1014
1015 static void tty3270_cleanup(struct tty_struct *tty)
1016 {
1017         struct tty3270 *tp = tty->driver_data;
1018
1019         if (tp)
1020                 raw3270_put_view(&tp->view);
1021 }
1022
1023 /*
1024  * We always have room.
1025  */
1026 static int
1027 tty3270_write_room(struct tty_struct *tty)
1028 {
1029         return INT_MAX;
1030 }
1031
1032 /*
1033  * Insert character into the screen at the current position with the
1034  * current color and highlight. This function does NOT do cursor movement.
1035  */
1036 static void tty3270_put_character(struct tty3270 *tp, char ch)
1037 {
1038         struct tty3270_line *line;
1039         struct tty3270_cell *cell;
1040
1041         line = tp->screen + tp->cy;
1042         if (line->len <= tp->cx) {
1043                 while (line->len < tp->cx) {
1044                         cell = line->cells + line->len;
1045                         cell->character = tp->view.ascebc[' '];
1046                         cell->highlight = tp->highlight;
1047                         cell->f_color = tp->f_color;
1048                         line->len++;
1049                 }
1050                 line->len++;
1051         }
1052         cell = line->cells + tp->cx;
1053         cell->character = tp->view.ascebc[(unsigned int) ch];
1054         cell->highlight = tp->highlight;
1055         cell->f_color = tp->f_color;
1056 }
1057
1058 /*
1059  * Convert a tty3270_line to a 3270 data fragment usable for output.
1060  */
1061 static void
1062 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1063 {
1064         struct tty3270_line *line;
1065         struct tty3270_cell *cell;
1066         struct string *s, *n;
1067         unsigned char highlight;
1068         unsigned char f_color;
1069         char *cp;
1070         int flen, i;
1071
1072         /* Determine how long the fragment will be. */
1073         flen = 3;               /* Prefix (TO_SBA). */
1074         line = tp->screen + line_nr;
1075         flen += line->len;
1076         highlight = TAX_RESET;
1077         f_color = TAC_RESET;
1078         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1079                 if (cell->highlight != highlight) {
1080                         flen += 3;      /* TO_SA to switch highlight. */
1081                         highlight = cell->highlight;
1082                 }
1083                 if (cell->f_color != f_color) {
1084                         flen += 3;      /* TO_SA to switch color. */
1085                         f_color = cell->f_color;
1086                 }
1087         }
1088         if (highlight != TAX_RESET)
1089                 flen += 3;      /* TO_SA to reset hightlight. */
1090         if (f_color != TAC_RESET)
1091                 flen += 3;      /* TO_SA to reset color. */
1092         if (line->len < tp->view.cols)
1093                 flen += 4;      /* Postfix (TO_RA). */
1094
1095         /* Find the line in the list. */
1096         i = tp->view.rows - 2 - line_nr;
1097         list_for_each_entry_reverse(s, &tp->lines, list)
1098                 if (--i <= 0)
1099                         break;
1100         /*
1101          * Check if the line needs to get reallocated.
1102          */
1103         if (s->len != flen) {
1104                 /* Reallocate string. */
1105                 n = tty3270_alloc_string(tp, flen);
1106                 list_add(&n->list, &s->list);
1107                 list_del_init(&s->list);
1108                 if (!list_empty(&s->update))
1109                         list_del_init(&s->update);
1110                 free_string(&tp->freemem, s);
1111                 s = n;
1112         }
1113
1114         /* Write 3270 data fragment. */
1115         cp = s->string;
1116         *cp++ = TO_SBA;
1117         *cp++ = 0;
1118         *cp++ = 0;
1119
1120         highlight = TAX_RESET;
1121         f_color = TAC_RESET;
1122         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1123                 if (cell->highlight != highlight) {
1124                         *cp++ = TO_SA;
1125                         *cp++ = TAT_EXTHI;
1126                         *cp++ = cell->highlight;
1127                         highlight = cell->highlight;
1128                 }
1129                 if (cell->f_color != f_color) {
1130                         *cp++ = TO_SA;
1131                         *cp++ = TAT_COLOR;
1132                         *cp++ = cell->f_color;
1133                         f_color = cell->f_color;
1134                 }
1135                 *cp++ = cell->character;
1136         }
1137         if (highlight != TAX_RESET) {
1138                 *cp++ = TO_SA;
1139                 *cp++ = TAT_EXTHI;
1140                 *cp++ = TAX_RESET;
1141         }
1142         if (f_color != TAC_RESET) {
1143                 *cp++ = TO_SA;
1144                 *cp++ = TAT_COLOR;
1145                 *cp++ = TAC_RESET;
1146         }
1147         if (line->len < tp->view.cols) {
1148                 *cp++ = TO_RA;
1149                 *cp++ = 0;
1150                 *cp++ = 0;
1151                 *cp++ = 0;
1152         }
1153
1154         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1155                 /* Line is currently visible on screen. */
1156                 tty3270_update_string(tp, s, line_nr);
1157                 /* Add line to update list. */
1158                 if (list_empty(&s->update)) {
1159                         list_add_tail(&s->update, &tp->update);
1160                         tp->update_flags |= TTY_UPDATE_LIST;
1161                 }
1162         }
1163 }
1164
1165 /*
1166  * Do carriage return.
1167  */
1168 static void
1169 tty3270_cr(struct tty3270 *tp)
1170 {
1171         tp->cx = 0;
1172 }
1173
1174 /*
1175  * Do line feed.
1176  */
1177 static void
1178 tty3270_lf(struct tty3270 *tp)
1179 {
1180         struct tty3270_line temp;
1181         int i;
1182
1183         tty3270_convert_line(tp, tp->cy);
1184         if (tp->cy < tp->view.rows - 3) {
1185                 tp->cy++;
1186                 return;
1187         }
1188         /* Last line just filled up. Add new, blank line. */
1189         tty3270_blank_line(tp);
1190         temp = tp->screen[0];
1191         temp.len = 0;
1192         for (i = 0; i < tp->view.rows - 3; i++)
1193                 tp->screen[i] = tp->screen[i+1];
1194         tp->screen[tp->view.rows - 3] = temp;
1195         tty3270_rebuild_update(tp);
1196 }
1197
1198 static void
1199 tty3270_ri(struct tty3270 *tp)
1200 {
1201         if (tp->cy > 0) {
1202             tty3270_convert_line(tp, tp->cy);
1203             tp->cy--;
1204         }
1205 }
1206
1207 /*
1208  * Insert characters at current position.
1209  */
1210 static void
1211 tty3270_insert_characters(struct tty3270 *tp, int n)
1212 {
1213         struct tty3270_line *line;
1214         int k;
1215
1216         line = tp->screen + tp->cy;
1217         while (line->len < tp->cx) {
1218                 line->cells[line->len].character = tp->view.ascebc[' '];
1219                 line->cells[line->len].highlight = TAX_RESET;
1220                 line->cells[line->len].f_color = TAC_RESET;
1221                 line->len++;
1222         }
1223         if (n > tp->view.cols - tp->cx)
1224                 n = tp->view.cols - tp->cx;
1225         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1226         while (k--)
1227                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1228         line->len += n;
1229         if (line->len > tp->view.cols)
1230                 line->len = tp->view.cols;
1231         while (n-- > 0) {
1232                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1233                 line->cells[tp->cx + n].highlight = tp->highlight;
1234                 line->cells[tp->cx + n].f_color = tp->f_color;
1235         }
1236 }
1237
1238 /*
1239  * Delete characters at current position.
1240  */
1241 static void
1242 tty3270_delete_characters(struct tty3270 *tp, int n)
1243 {
1244         struct tty3270_line *line;
1245         int i;
1246
1247         line = tp->screen + tp->cy;
1248         if (line->len <= tp->cx)
1249                 return;
1250         if (line->len - tp->cx <= n) {
1251                 line->len = tp->cx;
1252                 return;
1253         }
1254         for (i = tp->cx; i + n < line->len; i++)
1255                 line->cells[i] = line->cells[i + n];
1256         line->len -= n;
1257 }
1258
1259 /*
1260  * Erase characters at current position.
1261  */
1262 static void
1263 tty3270_erase_characters(struct tty3270 *tp, int n)
1264 {
1265         struct tty3270_line *line;
1266         struct tty3270_cell *cell;
1267
1268         line = tp->screen + tp->cy;
1269         while (line->len > tp->cx && n-- > 0) {
1270                 cell = line->cells + tp->cx++;
1271                 cell->character = ' ';
1272                 cell->highlight = TAX_RESET;
1273                 cell->f_color = TAC_RESET;
1274         }
1275         tp->cx += n;
1276         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1277 }
1278
1279 /*
1280  * Erase line, 3 different cases:
1281  *  Esc [ 0 K   Erase from current position to end of line inclusive
1282  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1283  *  Esc [ 2 K   Erase entire line (without moving cursor)
1284  */
1285 static void
1286 tty3270_erase_line(struct tty3270 *tp, int mode)
1287 {
1288         struct tty3270_line *line;
1289         struct tty3270_cell *cell;
1290         int i;
1291
1292         line = tp->screen + tp->cy;
1293         if (mode == 0)
1294                 line->len = tp->cx;
1295         else if (mode == 1) {
1296                 for (i = 0; i < tp->cx; i++) {
1297                         cell = line->cells + i;
1298                         cell->character = ' ';
1299                         cell->highlight = TAX_RESET;
1300                         cell->f_color = TAC_RESET;
1301                 }
1302                 if (line->len <= tp->cx)
1303                         line->len = tp->cx + 1;
1304         } else if (mode == 2)
1305                 line->len = 0;
1306         tty3270_convert_line(tp, tp->cy);
1307 }
1308
1309 /*
1310  * Erase display, 3 different cases:
1311  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1312  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1313  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1314  */
1315 static void
1316 tty3270_erase_display(struct tty3270 *tp, int mode)
1317 {
1318         int i;
1319
1320         if (mode == 0) {
1321                 tty3270_erase_line(tp, 0);
1322                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1323                         tp->screen[i].len = 0;
1324                         tty3270_convert_line(tp, i);
1325                 }
1326         } else if (mode == 1) {
1327                 for (i = 0; i < tp->cy; i++) {
1328                         tp->screen[i].len = 0;
1329                         tty3270_convert_line(tp, i);
1330                 }
1331                 tty3270_erase_line(tp, 1);
1332         } else if (mode == 2) {
1333                 for (i = 0; i < tp->view.rows - 2; i++) {
1334                         tp->screen[i].len = 0;
1335                         tty3270_convert_line(tp, i);
1336                 }
1337         }
1338         tty3270_rebuild_update(tp);
1339 }
1340
1341 /*
1342  * Set attributes found in an escape sequence.
1343  *  Esc [ <attr> ; <attr> ; ... m
1344  */
1345 static void
1346 tty3270_set_attributes(struct tty3270 *tp)
1347 {
1348         static unsigned char f_colors[] = {
1349                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1350                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1351         };
1352         int i, attr;
1353
1354         for (i = 0; i <= tp->esc_npar; i++) {
1355                 attr = tp->esc_par[i];
1356                 switch (attr) {
1357                 case 0:         /* Reset */
1358                         tp->highlight = TAX_RESET;
1359                         tp->f_color = TAC_RESET;
1360                         break;
1361                 /* Highlight. */
1362                 case 4:         /* Start underlining. */
1363                         tp->highlight = TAX_UNDER;
1364                         break;
1365                 case 5:         /* Start blink. */
1366                         tp->highlight = TAX_BLINK;
1367                         break;
1368                 case 7:         /* Start reverse. */
1369                         tp->highlight = TAX_REVER;
1370                         break;
1371                 case 24:        /* End underlining */
1372                         if (tp->highlight == TAX_UNDER)
1373                                 tp->highlight = TAX_RESET;
1374                         break;
1375                 case 25:        /* End blink. */
1376                         if (tp->highlight == TAX_BLINK)
1377                                 tp->highlight = TAX_RESET;
1378                         break;
1379                 case 27:        /* End reverse. */
1380                         if (tp->highlight == TAX_REVER)
1381                                 tp->highlight = TAX_RESET;
1382                         break;
1383                 /* Foreground color. */
1384                 case 30:        /* Black */
1385                 case 31:        /* Red */
1386                 case 32:        /* Green */
1387                 case 33:        /* Yellow */
1388                 case 34:        /* Blue */
1389                 case 35:        /* Magenta */
1390                 case 36:        /* Cyan */
1391                 case 37:        /* White */
1392                 case 39:        /* Black */
1393                         tp->f_color = f_colors[attr - 30];
1394                         break;
1395                 }
1396         }
1397 }
1398
1399 static inline int
1400 tty3270_getpar(struct tty3270 *tp, int ix)
1401 {
1402         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1403 }
1404
1405 static void
1406 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1407 {
1408         int max_cx = max(0, cx);
1409         int max_cy = max(0, cy);
1410
1411         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1412         cy = min_t(int, tp->view.rows - 3, max_cy);
1413         if (cy != tp->cy) {
1414                 tty3270_convert_line(tp, tp->cy);
1415                 tp->cy = cy;
1416         }
1417 }
1418
1419 /*
1420  * Process escape sequences. Known sequences:
1421  *  Esc 7                       Save Cursor Position
1422  *  Esc 8                       Restore Cursor Position
1423  *  Esc [ Pn ; Pn ; .. m        Set attributes
1424  *  Esc [ Pn ; Pn H             Cursor Position
1425  *  Esc [ Pn ; Pn f             Cursor Position
1426  *  Esc [ Pn A                  Cursor Up
1427  *  Esc [ Pn B                  Cursor Down
1428  *  Esc [ Pn C                  Cursor Forward
1429  *  Esc [ Pn D                  Cursor Backward
1430  *  Esc [ Pn G                  Cursor Horizontal Absolute
1431  *  Esc [ Pn X                  Erase Characters
1432  *  Esc [ Ps J                  Erase in Display
1433  *  Esc [ Ps K                  Erase in Line
1434  * // FIXME: add all the new ones.
1435  *
1436  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1437  *  Ps is a selective parameter.
1438  */
1439 static void
1440 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1441 {
1442         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1443
1444         if (tp->esc_state == ESnormal) {
1445                 if (ch == 0x1b)
1446                         /* Starting new escape sequence. */
1447                         tp->esc_state = ESesc;
1448                 return;
1449         }
1450         if (tp->esc_state == ESesc) {
1451                 tp->esc_state = ESnormal;
1452                 switch (ch) {
1453                 case '[':
1454                         tp->esc_state = ESsquare;
1455                         break;
1456                 case 'E':
1457                         tty3270_cr(tp);
1458                         tty3270_lf(tp);
1459                         break;
1460                 case 'M':
1461                         tty3270_ri(tp);
1462                         break;
1463                 case 'D':
1464                         tty3270_lf(tp);
1465                         break;
1466                 case 'Z':               /* Respond ID. */
1467                         kbd_puts_queue(&tp->port, "\033[?6c");
1468                         break;
1469                 case '7':               /* Save cursor position. */
1470                         tp->saved_cx = tp->cx;
1471                         tp->saved_cy = tp->cy;
1472                         tp->saved_highlight = tp->highlight;
1473                         tp->saved_f_color = tp->f_color;
1474                         break;
1475                 case '8':               /* Restore cursor position. */
1476                         tty3270_convert_line(tp, tp->cy);
1477                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1478                         tp->highlight = tp->saved_highlight;
1479                         tp->f_color = tp->saved_f_color;
1480                         break;
1481                 case 'c':               /* Reset terminal. */
1482                         tp->cx = tp->saved_cx = 0;
1483                         tp->cy = tp->saved_cy = 0;
1484                         tp->highlight = tp->saved_highlight = TAX_RESET;
1485                         tp->f_color = tp->saved_f_color = TAC_RESET;
1486                         tty3270_erase_display(tp, 2);
1487                         break;
1488                 }
1489                 return;
1490         }
1491         if (tp->esc_state == ESsquare) {
1492                 tp->esc_state = ESgetpars;
1493                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1494                 tp->esc_npar = 0;
1495                 tp->esc_ques = (ch == '?');
1496                 if (tp->esc_ques)
1497                         return;
1498         }
1499         if (tp->esc_state == ESgetpars) {
1500                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1501                         tp->esc_npar++;
1502                         return;
1503                 }
1504                 if (ch >= '0' && ch <= '9') {
1505                         tp->esc_par[tp->esc_npar] *= 10;
1506                         tp->esc_par[tp->esc_npar] += ch - '0';
1507                         return;
1508                 }
1509         }
1510         tp->esc_state = ESnormal;
1511         if (ch == 'n' && !tp->esc_ques) {
1512                 if (tp->esc_par[0] == 5)                /* Status report. */
1513                         kbd_puts_queue(&tp->port, "\033[0n");
1514                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1515                         char buf[40];
1516                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1517                         kbd_puts_queue(&tp->port, buf);
1518                 }
1519                 return;
1520         }
1521         if (tp->esc_ques)
1522                 return;
1523         switch (ch) {
1524         case 'm':
1525                 tty3270_set_attributes(tp);
1526                 break;
1527         case 'H':       /* Set cursor position. */
1528         case 'f':
1529                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1530                                 tty3270_getpar(tp, 0) - 1);
1531                 break;
1532         case 'd':       /* Set y position. */
1533                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1534                 break;
1535         case 'A':       /* Cursor up. */
1536         case 'F':
1537                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1538                 break;
1539         case 'B':       /* Cursor down. */
1540         case 'e':
1541         case 'E':
1542                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1543                 break;
1544         case 'C':       /* Cursor forward. */
1545         case 'a':
1546                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1547                 break;
1548         case 'D':       /* Cursor backward. */
1549                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1550                 break;
1551         case 'G':       /* Set x position. */
1552         case '`':
1553                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1554                 break;
1555         case 'X':       /* Erase Characters. */
1556                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1557                 break;
1558         case 'J':       /* Erase display. */
1559                 tty3270_erase_display(tp, tp->esc_par[0]);
1560                 break;
1561         case 'K':       /* Erase line. */
1562                 tty3270_erase_line(tp, tp->esc_par[0]);
1563                 break;
1564         case 'P':       /* Delete characters. */
1565                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1566                 break;
1567         case '@':       /* Insert characters. */
1568                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1569                 break;
1570         case 's':       /* Save cursor position. */
1571                 tp->saved_cx = tp->cx;
1572                 tp->saved_cy = tp->cy;
1573                 tp->saved_highlight = tp->highlight;
1574                 tp->saved_f_color = tp->f_color;
1575                 break;
1576         case 'u':       /* Restore cursor position. */
1577                 tty3270_convert_line(tp, tp->cy);
1578                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1579                 tp->highlight = tp->saved_highlight;
1580                 tp->f_color = tp->saved_f_color;
1581                 break;
1582         }
1583 }
1584
1585 /*
1586  * String write routine for 3270 ttys
1587  */
1588 static void
1589 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1590                 const unsigned char *buf, int count)
1591 {
1592         int i_msg, i;
1593
1594         spin_lock_bh(&tp->view.lock);
1595         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1596                 if (tp->esc_state != 0) {
1597                         /* Continue escape sequence. */
1598                         tty3270_escape_sequence(tp, buf[i_msg]);
1599                         continue;
1600                 }
1601
1602                 switch (buf[i_msg]) {
1603                 case 0x07:              /* '\a' -- Alarm */
1604                         tp->wcc |= TW_PLUSALARM;
1605                         break;
1606                 case 0x08:              /* Backspace. */
1607                         if (tp->cx > 0) {
1608                                 tp->cx--;
1609                                 tty3270_put_character(tp, ' ');
1610                         }
1611                         break;
1612                 case 0x09:              /* '\t' -- Tabulate */
1613                         for (i = tp->cx % 8; i < 8; i++) {
1614                                 if (tp->cx >= tp->view.cols) {
1615                                         tty3270_cr(tp);
1616                                         tty3270_lf(tp);
1617                                         break;
1618                                 }
1619                                 tty3270_put_character(tp, ' ');
1620                                 tp->cx++;
1621                         }
1622                         break;
1623                 case 0x0a:              /* '\n' -- New Line */
1624                         tty3270_cr(tp);
1625                         tty3270_lf(tp);
1626                         break;
1627                 case 0x0c:              /* '\f' -- Form Feed */
1628                         tty3270_erase_display(tp, 2);
1629                         tp->cx = tp->cy = 0;
1630                         break;
1631                 case 0x0d:              /* '\r' -- Carriage Return */
1632                         tp->cx = 0;
1633                         break;
1634                 case 0x0f:              /* SuSE "exit alternate mode" */
1635                         break;
1636                 case 0x1b:              /* Start escape sequence. */
1637                         tty3270_escape_sequence(tp, buf[i_msg]);
1638                         break;
1639                 default:                /* Insert normal character. */
1640                         if (tp->cx >= tp->view.cols) {
1641                                 tty3270_cr(tp);
1642                                 tty3270_lf(tp);
1643                         }
1644                         tty3270_put_character(tp, buf[i_msg]);
1645                         tp->cx++;
1646                         break;
1647                 }
1648         }
1649         /* Convert current line to 3270 data fragment. */
1650         tty3270_convert_line(tp, tp->cy);
1651
1652         /* Setup timer to update display after 1/10 second */
1653         if (!timer_pending(&tp->timer))
1654                 tty3270_set_timer(tp, HZ/10);
1655
1656         spin_unlock_bh(&tp->view.lock);
1657 }
1658
1659 /*
1660  * String write routine for 3270 ttys
1661  */
1662 static int
1663 tty3270_write(struct tty_struct * tty,
1664               const unsigned char *buf, int count)
1665 {
1666         struct tty3270 *tp;
1667
1668         tp = tty->driver_data;
1669         if (!tp)
1670                 return 0;
1671         if (tp->char_count > 0) {
1672                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1673                 tp->char_count = 0;
1674         }
1675         tty3270_do_write(tp, tty, buf, count);
1676         return count;
1677 }
1678
1679 /*
1680  * Put single characters to the ttys character buffer
1681  */
1682 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1683 {
1684         struct tty3270 *tp;
1685
1686         tp = tty->driver_data;
1687         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1688                 return 0;
1689         tp->char_buf[tp->char_count++] = ch;
1690         return 1;
1691 }
1692
1693 /*
1694  * Flush all characters from the ttys characeter buffer put there
1695  * by tty3270_put_char.
1696  */
1697 static void
1698 tty3270_flush_chars(struct tty_struct *tty)
1699 {
1700         struct tty3270 *tp;
1701
1702         tp = tty->driver_data;
1703         if (!tp)
1704                 return;
1705         if (tp->char_count > 0) {
1706                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1707                 tp->char_count = 0;
1708         }
1709 }
1710
1711 /*
1712  * Returns the number of characters in the output buffer. This is
1713  * used in tty_wait_until_sent to wait until all characters have
1714  * appeared on the screen.
1715  */
1716 static int
1717 tty3270_chars_in_buffer(struct tty_struct *tty)
1718 {
1719         return 0;
1720 }
1721
1722 static void
1723 tty3270_flush_buffer(struct tty_struct *tty)
1724 {
1725 }
1726
1727 /*
1728  * Check for visible/invisible input switches
1729  */
1730 static void
1731 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1732 {
1733         struct tty3270 *tp;
1734         int new;
1735
1736         tp = tty->driver_data;
1737         if (!tp)
1738                 return;
1739         spin_lock_bh(&tp->view.lock);
1740         if (L_ICANON(tty)) {
1741                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1742                 if (new != tp->inattr) {
1743                         tp->inattr = new;
1744                         tty3270_update_prompt(tp, NULL, 0);
1745                         tty3270_set_timer(tp, 1);
1746                 }
1747         }
1748         spin_unlock_bh(&tp->view.lock);
1749 }
1750
1751 /*
1752  * Disable reading from a 3270 tty
1753  */
1754 static void
1755 tty3270_throttle(struct tty_struct * tty)
1756 {
1757         struct tty3270 *tp;
1758
1759         tp = tty->driver_data;
1760         if (!tp)
1761                 return;
1762         tp->throttle = 1;
1763 }
1764
1765 /*
1766  * Enable reading from a 3270 tty
1767  */
1768 static void
1769 tty3270_unthrottle(struct tty_struct * tty)
1770 {
1771         struct tty3270 *tp;
1772
1773         tp = tty->driver_data;
1774         if (!tp)
1775                 return;
1776         tp->throttle = 0;
1777         if (tp->attn)
1778                 tty3270_issue_read(tp, 1);
1779 }
1780
1781 /*
1782  * Hang up the tty device.
1783  */
1784 static void
1785 tty3270_hangup(struct tty_struct *tty)
1786 {
1787         // FIXME: implement
1788 }
1789
1790 static void
1791 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1792 {
1793 }
1794
1795 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1796                          unsigned long arg)
1797 {
1798         struct tty3270 *tp;
1799
1800         tp = tty->driver_data;
1801         if (!tp)
1802                 return -ENODEV;
1803         if (tty->flags & (1 << TTY_IO_ERROR))
1804                 return -EIO;
1805         return kbd_ioctl(tp->kbd, cmd, arg);
1806 }
1807
1808 #ifdef CONFIG_COMPAT
1809 static long tty3270_compat_ioctl(struct tty_struct *tty,
1810                                  unsigned int cmd, unsigned long arg)
1811 {
1812         struct tty3270 *tp;
1813
1814         tp = tty->driver_data;
1815         if (!tp)
1816                 return -ENODEV;
1817         if (tty->flags & (1 << TTY_IO_ERROR))
1818                 return -EIO;
1819         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1820 }
1821 #endif
1822
1823 static const struct tty_operations tty3270_ops = {
1824         .install = tty3270_install,
1825         .cleanup = tty3270_cleanup,
1826         .open = tty3270_open,
1827         .close = tty3270_close,
1828         .write = tty3270_write,
1829         .put_char = tty3270_put_char,
1830         .flush_chars = tty3270_flush_chars,
1831         .write_room = tty3270_write_room,
1832         .chars_in_buffer = tty3270_chars_in_buffer,
1833         .flush_buffer = tty3270_flush_buffer,
1834         .throttle = tty3270_throttle,
1835         .unthrottle = tty3270_unthrottle,
1836         .hangup = tty3270_hangup,
1837         .wait_until_sent = tty3270_wait_until_sent,
1838         .ioctl = tty3270_ioctl,
1839 #ifdef CONFIG_COMPAT
1840         .compat_ioctl = tty3270_compat_ioctl,
1841 #endif
1842         .set_termios = tty3270_set_termios
1843 };
1844
1845 static void tty3270_create_cb(int minor)
1846 {
1847         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1848 }
1849
1850 static void tty3270_destroy_cb(int minor)
1851 {
1852         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1853 }
1854
1855 static struct raw3270_notifier tty3270_notifier =
1856 {
1857         .create = tty3270_create_cb,
1858         .destroy = tty3270_destroy_cb,
1859 };
1860
1861 /*
1862  * 3270 tty registration code called from tty_init().
1863  * Most kernel services (incl. kmalloc) are available at this poimt.
1864  */
1865 static int __init tty3270_init(void)
1866 {
1867         struct tty_driver *driver;
1868         int ret;
1869
1870         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1871                                   TTY_DRIVER_REAL_RAW |
1872                                   TTY_DRIVER_DYNAMIC_DEV |
1873                                   TTY_DRIVER_RESET_TERMIOS);
1874         if (IS_ERR(driver))
1875                 return PTR_ERR(driver);
1876
1877         /*
1878          * Initialize the tty_driver structure
1879          * Entries in tty3270_driver that are NOT initialized:
1880          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1881          */
1882         driver->driver_name = "tty3270";
1883         driver->name = "3270/tty";
1884         driver->major = IBM_TTY3270_MAJOR;
1885         driver->minor_start = RAW3270_FIRSTMINOR;
1886         driver->name_base = RAW3270_FIRSTMINOR;
1887         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1888         driver->subtype = SYSTEM_TYPE_TTY;
1889         driver->init_termios = tty_std_termios;
1890         tty_set_operations(driver, &tty3270_ops);
1891         ret = tty_register_driver(driver);
1892         if (ret) {
1893                 put_tty_driver(driver);
1894                 return ret;
1895         }
1896         tty3270_driver = driver;
1897         raw3270_register_notifier(&tty3270_notifier);
1898         return 0;
1899 }
1900
1901 static void __exit
1902 tty3270_exit(void)
1903 {
1904         struct tty_driver *driver;
1905
1906         raw3270_unregister_notifier(&tty3270_notifier);
1907         driver = tty3270_driver;
1908         tty3270_driver = NULL;
1909         tty_unregister_driver(driver);
1910         put_tty_driver(driver);
1911         tty3270_del_views();
1912 }
1913
1914 MODULE_LICENSE("GPL");
1915 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1916
1917 module_init(tty3270_init);
1918 module_exit(tty3270_exit);