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 tasklet_struct hanglet;  /* Tasklet to hang up the tty. */
  96         struct kbd_data *kbd;           /* key_maps stuff. */
  97
  98         /* Escape sequence parsing. */
  99         int esc_state, esc_ques, esc_npar;
 100         int esc_par[ESCAPE_NPAR];
 101         unsigned int saved_cx, saved_cy;
 102         unsigned int saved_highlight, saved_f_color;
 103
 104         /* Command recalling. */
 105         struct list_head rcl_lines;     /* List of recallable lines. */
 106         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
 107         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
 108
 109         /* Character array for put_char/flush_chars. */
 110         unsigned int char_count;
 111         char char_buf[TTY3270_CHAR_BUF_SIZE];
 112 };
 113
 114 /* tty3270->update_flags. See tty3270_update for details. */
 115 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
 116 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
 117 #define TTY_UPDATE_INPUT        4       /* Update input line. */
 118 #define TTY_UPDATE_STATUS       8       /* Update status line. */
 119 #define TTY_UPDATE_ALL          16      /* Recreate screen. */
 120
 121 static void tty3270_update(struct tty3270 *);
 122 static void tty3270_resize_work(struct work_struct *work);
 123
 124 /*
 125  * Setup timeout for a device. On timeout trigger an update.
 126  */
 127 static void tty3270_set_timer(struct tty3270 *tp, int expires)
 128 {
 129         mod_timer(&tp->timer, jiffies + expires);
 130 }
 131
 132 /*
 133  * The input line are the two last lines of the screen.
 134  */
 135 static void
 136 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
 137 {
 138         struct string *line;
 139         unsigned int off;
 140
 141         line = tp->prompt;
 142         if (count != 0)
 143                 line->string[5] = TF_INMDT;
 144         else
 145                 line->string[5] = tp->inattr;
 146         if (count > tp->view.cols * 2 - 11)
 147                 count = tp->view.cols * 2 - 11;
 148         memcpy(line->string + 6, input, count);
 149         line->string[6 + count] = TO_IC;
 150         /* Clear to end of input line. */
 151         if (count < tp->view.cols * 2 - 11) {
 152                 line->string[7 + count] = TO_RA;
 153                 line->string[10 + count] = 0;
 154                 off = tp->view.cols * tp->view.rows - 9;
 155                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
 156                 line->len = 11 + count;
 157         } else
 158                 line->len = 7 + count;
 159         tp->update_flags |= TTY_UPDATE_INPUT;
 160 }
 161
 162 static void
 163 tty3270_create_prompt(struct tty3270 *tp)
 164 {
 165         static const unsigned char blueprint[] =
 166                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
 167                   /* empty input string */
 168                   TO_IC, TO_RA, 0, 0, 0 };
 169         struct string *line;
 170         unsigned int offset;
 171
 172         line = alloc_string(&tp->freemem,
 173                             sizeof(blueprint) + tp->view.cols * 2 - 9);
 174         tp->prompt = line;
 175         tp->inattr = TF_INPUT;
 176         /* Copy blueprint to status line */
 177         memcpy(line->string, blueprint, sizeof(blueprint));
 178         line->len = sizeof(blueprint);
 179         /* Set output offsets. */
 180         offset = tp->view.cols * (tp->view.rows - 2);
 181         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 182         offset = tp->view.cols * tp->view.rows - 9;
 183         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
 184
 185         /* Allocate input string for reading. */
 186         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
 187 }
 188
 189 /*
 190  * The status line is the last line of the screen. It shows the string
 191  * "Running"/"Holding" in the lower right corner of the screen.
 192  */
 193 static void
 194 tty3270_update_status(struct tty3270 * tp)
 195 {
 196         char *str;
 197
 198         str = (tp->nr_up != 0) ? "History" : "Running";
 199         memcpy(tp->status->string + 8, str, 7);
 200         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 201         tp->update_flags |= TTY_UPDATE_STATUS;
 202 }
 203
 204 static void
 205 tty3270_create_status(struct tty3270 * tp)
 206 {
 207         static const unsigned char blueprint[] =
 208                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
 209                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
 210                   TAC_RESET };
 211         struct string *line;
 212         unsigned int offset;
 213
 214         line = alloc_string(&tp->freemem,sizeof(blueprint));
 215         tp->status = line;
 216         /* Copy blueprint to status line */
 217         memcpy(line->string, blueprint, sizeof(blueprint));
 218         /* Set address to start of status string (= last 9 characters). */
 219         offset = tp->view.cols * tp->view.rows - 9;
 220         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 221 }
 222
 223 /*
 224  * Set output offsets to 3270 datastream fragment of a tty string.
 225  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
 226  */
 227 static void
 228 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
 229 {
 230         unsigned char *cp;
 231
 232         raw3270_buffer_address(tp->view.dev, line->string + 1,
 233                                tp->view.cols * nr);
 234         cp = line->string + line->len - 4;
 235         if (*cp == TO_RA)
 236                 raw3270_buffer_address(tp->view.dev, cp + 1,
 237                                        tp->view.cols * (nr + 1));
 238 }
 239
 240 /*
 241  * Rebuild update list to print all lines.
 242  */
 243 static void
 244 tty3270_rebuild_update(struct tty3270 *tp)
 245 {
 246         struct string *s, *n;
 247         int line, nr_up;
 248
 249         /*
 250          * Throw away update list and create a new one,
 251          * containing all lines that will fit on the screen.
 252          */
 253         list_for_each_entry_safe(s, n, &tp->update, update)
 254                 list_del_init(&s->update);
 255         line = tp->view.rows - 3;
 256         nr_up = tp->nr_up;
 257         list_for_each_entry_reverse(s, &tp->lines, list) {
 258                 if (nr_up > 0) {
 259                         nr_up--;
 260                         continue;
 261                 }
 262                 tty3270_update_string(tp, s, line);
 263                 list_add(&s->update, &tp->update);
 264                 if (--line < 0)
 265                         break;
 266         }
 267         tp->update_flags |= TTY_UPDATE_LIST;
 268 }
 269
 270 /*
 271  * Alloc string for size bytes. If there is not enough room in
 272  * freemem, free strings until there is room.
 273  */
 274 static struct string *
 275 tty3270_alloc_string(struct tty3270 *tp, size_t size)
 276 {
 277         struct string *s, *n;
 278
 279         s = alloc_string(&tp->freemem, size);
 280         if (s)
 281                 return s;
 282         list_for_each_entry_safe(s, n, &tp->lines, list) {
 283                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
 284                 list_del(&s->list);
 285                 if (!list_empty(&s->update))
 286                         list_del(&s->update);
 287                 tp->nr_lines--;
 288                 if (free_string(&tp->freemem, s) >= size)
 289                         break;
 290         }
 291         s = alloc_string(&tp->freemem, size);
 292         BUG_ON(!s);
 293         if (tp->nr_up != 0 &&
 294             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
 295                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
 296                 tty3270_rebuild_update(tp);
 297                 tty3270_update_status(tp);
 298         }
 299         return s;
 300 }
 301
 302 /*
 303  * Add an empty line to the list.
 304  */
 305 static void
 306 tty3270_blank_line(struct tty3270 *tp)
 307 {
 308         static const unsigned char blueprint[] =
 309                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
 310                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
 311         struct string *s;
 312
 313         s = tty3270_alloc_string(tp, sizeof(blueprint));
 314         memcpy(s->string, blueprint, sizeof(blueprint));
 315         s->len = sizeof(blueprint);
 316         list_add_tail(&s->list, &tp->lines);
 317         tp->nr_lines++;
 318         if (tp->nr_up != 0)
 319                 tp->nr_up++;
 320 }
 321
 322 /*
 323  * Create a blank screen and remove all lines from the history.
 324  */
 325 static void
 326 tty3270_blank_screen(struct tty3270 *tp)
 327 {
 328         struct string *s, *n;
 329         int i;
 330
 331         for (i = 0; i < tp->view.rows - 2; i++)
 332                 tp->screen[i].len = 0;
 333         tp->nr_up = 0;
 334         list_for_each_entry_safe(s, n, &tp->lines, list) {
 335                 list_del(&s->list);
 336                 if (!list_empty(&s->update))
 337                         list_del(&s->update);
 338                 tp->nr_lines--;
 339                 free_string(&tp->freemem, s);
 340         }
 341 }
 342
 343 /*
 344  * Write request completion callback.
 345  */
 346 static void
 347 tty3270_write_callback(struct raw3270_request *rq, void *data)
 348 {
 349         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 350
 351         if (rq->rc != 0) {
 352                 /* Write wasn't successful. Refresh all. */
 353                 tp->update_flags = TTY_UPDATE_ALL;
 354                 tty3270_set_timer(tp, 1);
 355         }
 356         raw3270_request_reset(rq);
 357         xchg(&tp->write, rq);
 358 }
 359
 360 /*
 361  * Update 3270 display.
 362  */
 363 static void
 364 tty3270_update(struct tty3270 *tp)
 365 {
 366         static char invalid_sba[2] = { 0xff, 0xff };
 367         struct raw3270_request *wrq;
 368         unsigned long updated;
 369         struct string *s, *n;
 370         char *sba, *str;
 371         int rc, len;
 372
 373         wrq = xchg(&tp->write, 0);
 374         if (!wrq) {
 375                 tty3270_set_timer(tp, 1);
 376                 return;
 377         }
 378
 379         spin_lock(&tp->view.lock);
 380         updated = 0;
 381         if (tp->update_flags & TTY_UPDATE_ALL) {
 382                 tty3270_rebuild_update(tp);
 383                 tty3270_update_status(tp);
 384                 tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
 385                         TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
 386         }
 387         if (tp->update_flags & TTY_UPDATE_ERASE) {
 388                 /* Use erase write alternate to erase display. */
 389                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 390                 updated |= TTY_UPDATE_ERASE;
 391         } else
 392                 raw3270_request_set_cmd(wrq, TC_WRITE);
 393
 394         raw3270_request_add_data(wrq, &tp->wcc, 1);
 395         tp->wcc = TW_NONE;
 396
 397         /*
 398          * Update status line.
 399          */
 400         if (tp->update_flags & TTY_UPDATE_STATUS)
 401                 if (raw3270_request_add_data(wrq, tp->status->string,
 402                                              tp->status->len) == 0)
 403                         updated |= TTY_UPDATE_STATUS;
 404
 405         /*
 406          * Write input line.
 407          */
 408         if (tp->update_flags & TTY_UPDATE_INPUT)
 409                 if (raw3270_request_add_data(wrq, tp->prompt->string,
 410                                              tp->prompt->len) == 0)
 411                         updated |= TTY_UPDATE_INPUT;
 412
 413         sba = invalid_sba;
 414
 415         if (tp->update_flags & TTY_UPDATE_LIST) {
 416                 /* Write strings in the update list to the screen. */
 417                 list_for_each_entry_safe(s, n, &tp->update, update) {
 418                         str = s->string;
 419                         len = s->len;
 420                         /*
 421                          * Skip TO_SBA at the start of the string if the
 422                          * last output position matches the start address
 423                          * of this line.
 424                          */
 425                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
 426                                 str += 3, len -= 3;
 427                         if (raw3270_request_add_data(wrq, str, len) != 0)
 428                                 break;
 429                         list_del_init(&s->update);
 430                         if (s->string[s->len - 4] == TO_RA)
 431                                 sba = s->string + s->len - 3;
 432                         else
 433                                 sba = invalid_sba;
 434                 }
 435                 if (list_empty(&tp->update))
 436                         updated |= TTY_UPDATE_LIST;
 437         }
 438         wrq->callback = tty3270_write_callback;
 439         rc = raw3270_start(&tp->view, wrq);
 440         if (rc == 0) {
 441                 tp->update_flags &= ~updated;
 442                 if (tp->update_flags)
 443                         tty3270_set_timer(tp, 1);
 444         } else {
 445                 raw3270_request_reset(wrq);
 446                 xchg(&tp->write, wrq);
 447         }
 448         spin_unlock(&tp->view.lock);
 449 }
 450
 451 /*
 452  * Command recalling.
 453  */
 454 static void
 455 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
 456 {
 457         struct string *s;
 458
 459         tp->rcl_walk = NULL;
 460         if (len <= 0)
 461                 return;
 462         if (tp->rcl_nr >= tp->rcl_max) {
 463                 s = list_entry(tp->rcl_lines.next, struct string, list);
 464                 list_del(&s->list);
 465                 free_string(&tp->freemem, s);
 466                 tp->rcl_nr--;
 467         }
 468         s = tty3270_alloc_string(tp, len);
 469         memcpy(s->string, input, len);
 470         list_add_tail(&s->list, &tp->rcl_lines);
 471         tp->rcl_nr++;
 472 }
 473
 474 static void
 475 tty3270_rcl_backward(struct kbd_data *kbd)
 476 {
 477         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 478         struct string *s;
 479
 480         spin_lock_bh(&tp->view.lock);
 481         if (tp->inattr == TF_INPUT) {
 482                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
 483                         tp->rcl_walk = tp->rcl_walk->prev;
 484                 else if (!list_empty(&tp->rcl_lines))
 485                         tp->rcl_walk = tp->rcl_lines.prev;
 486                 s = tp->rcl_walk ?
 487                         list_entry(tp->rcl_walk, struct string, list) : NULL;
 488                 if (tp->rcl_walk) {
 489                         s = list_entry(tp->rcl_walk, struct string, list);
 490                         tty3270_update_prompt(tp, s->string, s->len);
 491                 } else
 492                         tty3270_update_prompt(tp, NULL, 0);
 493                 tty3270_set_timer(tp, 1);
 494         }
 495         spin_unlock_bh(&tp->view.lock);
 496 }
 497
 498 /*
 499  * Deactivate tty view.
 500  */
 501 static void
 502 tty3270_exit_tty(struct kbd_data *kbd)
 503 {
 504         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 505
 506         raw3270_deactivate_view(&tp->view);
 507 }
 508
 509 /*
 510  * Scroll forward in history.
 511  */
 512 static void
 513 tty3270_scroll_forward(struct kbd_data *kbd)
 514 {
 515         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 516         int nr_up;
 517
 518         spin_lock_bh(&tp->view.lock);
 519         nr_up = tp->nr_up - tp->view.rows + 2;
 520         if (nr_up < 0)
 521                 nr_up = 0;
 522         if (nr_up != tp->nr_up) {
 523                 tp->nr_up = nr_up;
 524                 tty3270_rebuild_update(tp);
 525                 tty3270_update_status(tp);
 526                 tty3270_set_timer(tp, 1);
 527         }
 528         spin_unlock_bh(&tp->view.lock);
 529 }
 530
 531 /*
 532  * Scroll backward in history.
 533  */
 534 static void
 535 tty3270_scroll_backward(struct kbd_data *kbd)
 536 {
 537         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 538         int nr_up;
 539
 540         spin_lock_bh(&tp->view.lock);
 541         nr_up = tp->nr_up + tp->view.rows - 2;
 542         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
 543                 nr_up = tp->nr_lines - tp->view.rows + 2;
 544         if (nr_up != tp->nr_up) {
 545                 tp->nr_up = nr_up;
 546                 tty3270_rebuild_update(tp);
 547                 tty3270_update_status(tp);
 548                 tty3270_set_timer(tp, 1);
 549         }
 550         spin_unlock_bh(&tp->view.lock);
 551 }
 552
 553 /*
 554  * Pass input line to tty.
 555  */
 556 static void
 557 tty3270_read_tasklet(struct raw3270_request *rrq)
 558 {
 559         static char kreset_data = TW_KR;
 560         struct tty3270 *tp = container_of(rrq->view, struct tty3270, view);
 561         char *input;
 562         int len;
 563
 564         spin_lock_bh(&tp->view.lock);
 565         /*
 566          * Two AID keys are special: For 0x7d (enter) the input line
 567          * has to be emitted to the tty and for 0x6d the screen
 568          * needs to be redrawn.
 569          */
 570         input = NULL;
 571         len = 0;
 572         if (tp->input->string[0] == 0x7d) {
 573                 /* Enter: write input to tty. */
 574                 input = tp->input->string + 6;
 575                 len = tp->input->len - 6 - rrq->rescnt;
 576                 if (tp->inattr != TF_INPUTN)
 577                         tty3270_rcl_add(tp, input, len);
 578                 if (tp->nr_up > 0) {
 579                         tp->nr_up = 0;
 580                         tty3270_rebuild_update(tp);
 581                         tty3270_update_status(tp);
 582                 }
 583                 /* Clear input area. */
 584                 tty3270_update_prompt(tp, NULL, 0);
 585                 tty3270_set_timer(tp, 1);
 586         } else if (tp->input->string[0] == 0x6d) {
 587                 /* Display has been cleared. Redraw. */
 588                 tp->update_flags = TTY_UPDATE_ALL;
 589                 tty3270_set_timer(tp, 1);
 590         }
 591         spin_unlock_bh(&tp->view.lock);
 592
 593         /* Start keyboard reset command. */
 594         raw3270_request_reset(tp->kreset);
 595         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
 596         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
 597         raw3270_start(&tp->view, tp->kreset);
 598
 599         while (len-- > 0)
 600                 kbd_keycode(tp->kbd, *input++);
 601         /* Emit keycode for AID byte. */
 602         kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
 603
 604         raw3270_request_reset(rrq);
 605         xchg(&tp->read, rrq);
 606         raw3270_put_view(&tp->view);
 607 }
 608
 609 /*
 610  * Read request completion callback.
 611  */
 612 static void
 613 tty3270_read_callback(struct raw3270_request *rq, void *data)
 614 {
 615         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 616         raw3270_get_view(rq->view);
 617         /* Schedule tasklet to pass input to tty. */
 618         tasklet_schedule(&tp->readlet);
 619 }
 620
 621 /*
 622  * Issue a read request. Call with device lock.
 623  */
 624 static void
 625 tty3270_issue_read(struct tty3270 *tp, int lock)
 626 {
 627         struct raw3270_request *rrq;
 628         int rc;
 629
 630         rrq = xchg(&tp->read, 0);
 631         if (!rrq)
 632                 /* Read already scheduled. */
 633                 return;
 634         rrq->callback = tty3270_read_callback;
 635         rrq->callback_data = tp;
 636         raw3270_request_set_cmd(rrq, TC_READMOD);
 637         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
 638         /* Issue the read modified request. */
 639         if (lock) {
 640                 rc = raw3270_start(&tp->view, rrq);
 641         } else
 642                 rc = raw3270_start_irq(&tp->view, rrq);
 643         if (rc) {
 644                 raw3270_request_reset(rrq);
 645                 xchg(&tp->read, rrq);
 646         }
 647 }
 648
 649 /*
 650  * Hang up the tty
 651  */
 652 static void
 653 tty3270_hangup_tasklet(struct tty3270 *tp)
 654 {
 655         tty_port_tty_hangup(&tp->port, true);
 656         raw3270_put_view(&tp->view);
 657 }
 658
 659 /*
 660  * Switch to the tty view.
 661  */
 662 static int
 663 tty3270_activate(struct raw3270_view *view)
 664 {
 665         struct tty3270 *tp = container_of(view, struct tty3270, view);
 666
 667         tp->update_flags = TTY_UPDATE_ALL;
 668         tty3270_set_timer(tp, 1);
 669         return 0;
 670 }
 671
 672 static void
 673 tty3270_deactivate(struct raw3270_view *view)
 674 {
 675         struct tty3270 *tp = container_of(view, struct tty3270, view);
 676
 677         del_timer(&tp->timer);
 678 }
 679
 680 static void
 681 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 682 {
 683         /* Handle ATTN. Schedule tasklet to read aid. */
 684         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 685                 if (!tp->throttle)
 686                         tty3270_issue_read(tp, 0);
 687                 else
 688                         tp->attn = 1;
 689         }
 690
 691         if (rq) {
 692                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 693                         rq->rc = -EIO;
 694                         raw3270_get_view(&tp->view);
 695                         tasklet_schedule(&tp->hanglet);
 696                 } else {
 697                         /* Normal end. Copy residual count. */
 698                         rq->rescnt = irb->scsw.cmd.count;
 699                 }
 700         } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 701                 /* Interrupt without an outstanding request -> update all */
 702                 tp->update_flags = TTY_UPDATE_ALL;
 703                 tty3270_set_timer(tp, 1);
 704         }
 705 }
 706
 707 /*
 708  * Allocate tty3270 structure.
 709  */
 710 static struct tty3270 *
 711 tty3270_alloc_view(void)
 712 {
 713         struct tty3270 *tp;
 714         int pages;
 715
 716         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
 717         if (!tp)
 718                 goto out_err;
 719         tp->freemem_pages =
 720                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 721         if (!tp->freemem_pages)
 722                 goto out_tp;
 723         INIT_LIST_HEAD(&tp->freemem);
 724         INIT_LIST_HEAD(&tp->lines);
 725         INIT_LIST_HEAD(&tp->update);
 726         INIT_LIST_HEAD(&tp->rcl_lines);
 727         tp->rcl_max = 20;
 728
 729         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 730                 tp->freemem_pages[pages] = (void *)
 731                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 732                 if (!tp->freemem_pages[pages])
 733                         goto out_pages;
 734                 add_string_memory(&tp->freemem,
 735                                   tp->freemem_pages[pages], PAGE_SIZE);
 736         }
 737         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 738         if (IS_ERR(tp->write))
 739                 goto out_pages;
 740         tp->read = raw3270_request_alloc(0);
 741         if (IS_ERR(tp->read))
 742                 goto out_write;
 743         tp->kreset = raw3270_request_alloc(1);
 744         if (IS_ERR(tp->kreset))
 745                 goto out_read;
 746         tp->kbd = kbd_alloc();
 747         if (!tp->kbd)
 748                 goto out_reset;
 749
 750         tty_port_init(&tp->port);
 751         setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update,
 752                     (unsigned long) tp);
 753         tasklet_init(&tp->readlet,
 754                      (void (*)(unsigned long)) tty3270_read_tasklet,
 755                      (unsigned long) tp->read);
 756         tasklet_init(&tp->hanglet,
 757                      (void (*)(unsigned long)) tty3270_hangup_tasklet,
 758                      (unsigned long) tp);
 759         INIT_WORK(&tp->resize_work, tty3270_resize_work);
 760
 761         return tp;
 762
 763 out_reset:
 764         raw3270_request_free(tp->kreset);
 765 out_read:
 766         raw3270_request_free(tp->read);
 767 out_write:
 768         raw3270_request_free(tp->write);
 769 out_pages:
 770         while (pages--)
 771                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 772         kfree(tp->freemem_pages);
 773         tty_port_destroy(&tp->port);
 774 out_tp:
 775         kfree(tp);
 776 out_err:
 777         return ERR_PTR(-ENOMEM);
 778 }
 779
 780 /*
 781  * Free tty3270 structure.
 782  */
 783 static void
 784 tty3270_free_view(struct tty3270 *tp)
 785 {
 786         int pages;
 787
 788         kbd_free(tp->kbd);
 789         raw3270_request_free(tp->kreset);
 790         raw3270_request_free(tp->read);
 791         raw3270_request_free(tp->write);
 792         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 793                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 794         kfree(tp->freemem_pages);
 795         tty_port_destroy(&tp->port);
 796         kfree(tp);
 797 }
 798
 799 /*
 800  * Allocate tty3270 screen.
 801  */
 802 static struct tty3270_line *
 803 tty3270_alloc_screen(unsigned int rows, unsigned int cols)
 804 {
 805         struct tty3270_line *screen;
 806         unsigned long size;
 807         int lines;
 808
 809         size = sizeof(struct tty3270_line) * (rows - 2);
 810         screen = kzalloc(size, GFP_KERNEL);
 811         if (!screen)
 812                 goto out_err;
 813         for (lines = 0; lines < rows - 2; lines++) {
 814                 size = sizeof(struct tty3270_cell) * cols;
 815                 screen[lines].cells = kzalloc(size, GFP_KERNEL);
 816                 if (!screen[lines].cells)
 817                         goto out_screen;
 818         }
 819         return screen;
 820 out_screen:
 821         while (lines--)
 822                 kfree(screen[lines].cells);
 823         kfree(screen);
 824 out_err:
 825         return ERR_PTR(-ENOMEM);
 826 }
 827
 828 /*
 829  * Free tty3270 screen.
 830  */
 831 static void
 832 tty3270_free_screen(struct tty3270_line *screen, unsigned int rows)
 833 {
 834         int lines;
 835
 836         for (lines = 0; lines < rows - 2; lines++)
 837                 kfree(screen[lines].cells);
 838         kfree(screen);
 839 }
 840
 841 /*
 842  * Resize tty3270 screen
 843  */
 844 static void tty3270_resize_work(struct work_struct *work)
 845 {
 846         struct tty3270 *tp = container_of(work, struct tty3270, resize_work);
 847         struct tty3270_line *screen, *oscreen;
 848         struct tty_struct *tty;
 849         unsigned int orows;
 850         struct winsize ws;
 851
 852         screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
 853         if (IS_ERR(screen))
 854                 return;
 855         /* Switch to new output size */
 856         spin_lock_bh(&tp->view.lock);
 857         tty3270_blank_screen(tp);
 858         oscreen = tp->screen;
 859         orows = tp->view.rows;
 860         tp->view.model = tp->n_model;
 861         tp->view.rows = tp->n_rows;
 862         tp->view.cols = tp->n_cols;
 863         tp->screen = screen;
 864         free_string(&tp->freemem, tp->prompt);
 865         free_string(&tp->freemem, tp->status);
 866         tty3270_create_prompt(tp);
 867         tty3270_create_status(tp);
 868         while (tp->nr_lines < tp->view.rows - 2)
 869                 tty3270_blank_line(tp);
 870         tp->update_flags = TTY_UPDATE_ALL;
 871         spin_unlock_bh(&tp->view.lock);
 872         tty3270_free_screen(oscreen, orows);
 873         tty3270_set_timer(tp, 1);
 874         /* Informat tty layer about new size */
 875         tty = tty_port_tty_get(&tp->port);
 876         if (!tty)
 877                 return;
 878         ws.ws_row = tp->view.rows - 2;
 879         ws.ws_col = tp->view.cols;
 880         tty_do_resize(tty, &ws);
 881         tty_kref_put(tty);
 882 }
 883
 884 static void
 885 tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
 886 {
 887         struct tty3270 *tp = container_of(view, struct tty3270, view);
 888
 889         if (tp->n_model == model && tp->n_rows == rows && tp->n_cols == cols)
 890                 return;
 891         tp->n_model = model;
 892         tp->n_rows = rows;
 893         tp->n_cols = cols;
 894         schedule_work(&tp->resize_work);
 895 }
 896
 897 /*
 898  * Unlink tty3270 data structure from tty.
 899  */
 900 static void
 901 tty3270_release(struct raw3270_view *view)
 902 {
 903         struct tty3270 *tp = container_of(view, struct tty3270, view);
 904         struct tty_struct *tty = tty_port_tty_get(&tp->port);
 905
 906         if (tty) {
 907                 tty->driver_data = NULL;
 908                 tty_port_tty_set(&tp->port, NULL);
 909                 tty_hangup(tty);
 910                 raw3270_put_view(&tp->view);
 911                 tty_kref_put(tty);
 912         }
 913 }
 914
 915 /*
 916  * Free tty3270 data structure
 917  */
 918 static void
 919 tty3270_free(struct raw3270_view *view)
 920 {
 921         struct tty3270 *tp = container_of(view, struct tty3270, view);
 922
 923         del_timer_sync(&tp->timer);
 924         tty3270_free_screen(tp->screen, tp->view.rows);
 925         tty3270_free_view(tp);
 926 }
 927
 928 /*
 929  * Delayed freeing of tty3270 views.
 930  */
 931 static void
 932 tty3270_del_views(void)
 933 {
 934         int i;
 935
 936         for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
 937                 struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
 938                 if (!IS_ERR(view))
 939                         raw3270_del_view(view);
 940         }
 941 }
 942
 943 static struct raw3270_fn tty3270_fn = {
 944         .activate = tty3270_activate,
 945         .deactivate = tty3270_deactivate,
 946         .intv = (void *) tty3270_irq,
 947         .release = tty3270_release,
 948         .free = tty3270_free,
 949         .resize = tty3270_resize
 950 };
 951
 952 /*
 953  * This routine is called whenever a 3270 tty is opened first time.
 954  */
 955 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 956 {
 957         struct raw3270_view *view;
 958         struct tty3270 *tp;
 959         int i, rc;
 960
 961         /* Check if the tty3270 is already there. */
 962         view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
 963         if (!IS_ERR(view)) {
 964                 tp = container_of(view, struct tty3270, view);
 965                 tty->driver_data = tp;
 966                 tty->winsize.ws_row = tp->view.rows - 2;
 967                 tty->winsize.ws_col = tp->view.cols;
 968                 tp->port.low_latency = 0;
 969                 tp->inattr = TF_INPUT;
 970                 goto port_install;
 971         }
 972         if (tty3270_max_index < tty->index + 1)
 973                 tty3270_max_index = tty->index + 1;
 974
 975         /* Allocate tty3270 structure on first open. */
 976         tp = tty3270_alloc_view();
 977         if (IS_ERR(tp))
 978                 return PTR_ERR(tp);
 979
 980         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 981                               tty->index + RAW3270_FIRSTMINOR);
 982         if (rc) {
 983                 tty3270_free_view(tp);
 984                 return rc;
 985         }
 986
 987         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 988         if (IS_ERR(tp->screen)) {
 989                 rc = PTR_ERR(tp->screen);
 990                 raw3270_put_view(&tp->view);
 991                 raw3270_del_view(&tp->view);
 992                 tty3270_free_view(tp);
 993                 return rc;
 994         }
 995
 996         tp->port.low_latency = 0;
 997         tty->winsize.ws_row = tp->view.rows - 2;
 998         tty->winsize.ws_col = tp->view.cols;
 999
1000         tty3270_create_prompt(tp);
1001         tty3270_create_status(tp);
1002         tty3270_update_status(tp);
1003
1004         /* Create blank line for every line in the tty output area. */
1005         for (i = 0; i < tp->view.rows - 2; i++)
1006                 tty3270_blank_line(tp);
1007
1008         tp->kbd->port = &tp->port;
1009         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
1010         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
1011         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
1012         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
1013         kbd_ascebc(tp->kbd, tp->view.ascebc);
1014
1015         raw3270_activate_view(&tp->view);
1016
1017 port_install:
1018         rc = tty_port_install(&tp->port, driver, tty);
1019         if (rc) {
1020                 raw3270_put_view(&tp->view);
1021                 return rc;
1022         }
1023
1024         tty->driver_data = tp;
1025
1026         return 0;
1027 }
1028
1029 /*
1030  * This routine is called whenever a 3270 tty is opened.
1031  */
1032 static int
1033 tty3270_open(struct tty_struct *tty, struct file *filp)
1034 {
1035         struct tty3270 *tp = tty->driver_data;
1036         struct tty_port *port = &tp->port;
1037
1038         port->count++;
1039         tty_port_tty_set(port, tty);
1040         return 0;
1041 }
1042
1043 /*
1044  * This routine is called when the 3270 tty is closed. We wait
1045  * for the remaining request to be completed. Then we clean up.
1046  */
1047 static void
1048 tty3270_close(struct tty_struct *tty, struct file * filp)
1049 {
1050         struct tty3270 *tp = tty->driver_data;
1051
1052         if (tty->count > 1)
1053                 return;
1054         if (tp)
1055                 tty_port_tty_set(&tp->port, NULL);
1056 }
1057
1058 static void tty3270_cleanup(struct tty_struct *tty)
1059 {
1060         struct tty3270 *tp = tty->driver_data;
1061
1062         if (tp) {
1063                 tty->driver_data = NULL;
1064                 raw3270_put_view(&tp->view);
1065         }
1066 }
1067
1068 /*
1069  * We always have room.
1070  */
1071 static int
1072 tty3270_write_room(struct tty_struct *tty)
1073 {
1074         return INT_MAX;
1075 }
1076
1077 /*
1078  * Insert character into the screen at the current position with the
1079  * current color and highlight. This function does NOT do cursor movement.
1080  */
1081 static void tty3270_put_character(struct tty3270 *tp, char ch)
1082 {
1083         struct tty3270_line *line;
1084         struct tty3270_cell *cell;
1085
1086         line = tp->screen + tp->cy;
1087         if (line->len <= tp->cx) {
1088                 while (line->len < tp->cx) {
1089                         cell = line->cells + line->len;
1090                         cell->character = tp->view.ascebc[' '];
1091                         cell->highlight = tp->highlight;
1092                         cell->f_color = tp->f_color;
1093                         line->len++;
1094                 }
1095                 line->len++;
1096         }
1097         cell = line->cells + tp->cx;
1098         cell->character = tp->view.ascebc[(unsigned int) ch];
1099         cell->highlight = tp->highlight;
1100         cell->f_color = tp->f_color;
1101 }
1102
1103 /*
1104  * Convert a tty3270_line to a 3270 data fragment usable for output.
1105  */
1106 static void
1107 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1108 {
1109         struct tty3270_line *line;
1110         struct tty3270_cell *cell;
1111         struct string *s, *n;
1112         unsigned char highlight;
1113         unsigned char f_color;
1114         char *cp;
1115         int flen, i;
1116
1117         /* Determine how long the fragment will be. */
1118         flen = 3;               /* Prefix (TO_SBA). */
1119         line = tp->screen + line_nr;
1120         flen += line->len;
1121         highlight = TAX_RESET;
1122         f_color = TAC_RESET;
1123         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1124                 if (cell->highlight != highlight) {
1125                         flen += 3;      /* TO_SA to switch highlight. */
1126                         highlight = cell->highlight;
1127                 }
1128                 if (cell->f_color != f_color) {
1129                         flen += 3;      /* TO_SA to switch color. */
1130                         f_color = cell->f_color;
1131                 }
1132         }
1133         if (highlight != TAX_RESET)
1134                 flen += 3;      /* TO_SA to reset hightlight. */
1135         if (f_color != TAC_RESET)
1136                 flen += 3;      /* TO_SA to reset color. */
1137         if (line->len < tp->view.cols)
1138                 flen += 4;      /* Postfix (TO_RA). */
1139
1140         /* Find the line in the list. */
1141         i = tp->view.rows - 2 - line_nr;
1142         list_for_each_entry_reverse(s, &tp->lines, list)
1143                 if (--i <= 0)
1144                         break;
1145         /*
1146          * Check if the line needs to get reallocated.
1147          */
1148         if (s->len != flen) {
1149                 /* Reallocate string. */
1150                 n = tty3270_alloc_string(tp, flen);
1151                 list_add(&n->list, &s->list);
1152                 list_del_init(&s->list);
1153                 if (!list_empty(&s->update))
1154                         list_del_init(&s->update);
1155                 free_string(&tp->freemem, s);
1156                 s = n;
1157         }
1158
1159         /* Write 3270 data fragment. */
1160         cp = s->string;
1161         *cp++ = TO_SBA;
1162         *cp++ = 0;
1163         *cp++ = 0;
1164
1165         highlight = TAX_RESET;
1166         f_color = TAC_RESET;
1167         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1168                 if (cell->highlight != highlight) {
1169                         *cp++ = TO_SA;
1170                         *cp++ = TAT_EXTHI;
1171                         *cp++ = cell->highlight;
1172                         highlight = cell->highlight;
1173                 }
1174                 if (cell->f_color != f_color) {
1175                         *cp++ = TO_SA;
1176                         *cp++ = TAT_COLOR;
1177                         *cp++ = cell->f_color;
1178                         f_color = cell->f_color;
1179                 }
1180                 *cp++ = cell->character;
1181         }
1182         if (highlight != TAX_RESET) {
1183                 *cp++ = TO_SA;
1184                 *cp++ = TAT_EXTHI;
1185                 *cp++ = TAX_RESET;
1186         }
1187         if (f_color != TAC_RESET) {
1188                 *cp++ = TO_SA;
1189                 *cp++ = TAT_COLOR;
1190                 *cp++ = TAC_RESET;
1191         }
1192         if (line->len < tp->view.cols) {
1193                 *cp++ = TO_RA;
1194                 *cp++ = 0;
1195                 *cp++ = 0;
1196                 *cp++ = 0;
1197         }
1198
1199         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1200                 /* Line is currently visible on screen. */
1201                 tty3270_update_string(tp, s, line_nr);
1202                 /* Add line to update list. */
1203                 if (list_empty(&s->update)) {
1204                         list_add_tail(&s->update, &tp->update);
1205                         tp->update_flags |= TTY_UPDATE_LIST;
1206                 }
1207         }
1208 }
1209
1210 /*
1211  * Do carriage return.
1212  */
1213 static void
1214 tty3270_cr(struct tty3270 *tp)
1215 {
1216         tp->cx = 0;
1217 }
1218
1219 /*
1220  * Do line feed.
1221  */
1222 static void
1223 tty3270_lf(struct tty3270 *tp)
1224 {
1225         struct tty3270_line temp;
1226         int i;
1227
1228         tty3270_convert_line(tp, tp->cy);
1229         if (tp->cy < tp->view.rows - 3) {
1230                 tp->cy++;
1231                 return;
1232         }
1233         /* Last line just filled up. Add new, blank line. */
1234         tty3270_blank_line(tp);
1235         temp = tp->screen[0];
1236         temp.len = 0;
1237         for (i = 0; i < tp->view.rows - 3; i++)
1238                 tp->screen[i] = tp->screen[i+1];
1239         tp->screen[tp->view.rows - 3] = temp;
1240         tty3270_rebuild_update(tp);
1241 }
1242
1243 static void
1244 tty3270_ri(struct tty3270 *tp)
1245 {
1246         if (tp->cy > 0) {
1247             tty3270_convert_line(tp, tp->cy);
1248             tp->cy--;
1249         }
1250 }
1251
1252 /*
1253  * Insert characters at current position.
1254  */
1255 static void
1256 tty3270_insert_characters(struct tty3270 *tp, int n)
1257 {
1258         struct tty3270_line *line;
1259         int k;
1260
1261         line = tp->screen + tp->cy;
1262         while (line->len < tp->cx) {
1263                 line->cells[line->len].character = tp->view.ascebc[' '];
1264                 line->cells[line->len].highlight = TAX_RESET;
1265                 line->cells[line->len].f_color = TAC_RESET;
1266                 line->len++;
1267         }
1268         if (n > tp->view.cols - tp->cx)
1269                 n = tp->view.cols - tp->cx;
1270         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1271         while (k--)
1272                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1273         line->len += n;
1274         if (line->len > tp->view.cols)
1275                 line->len = tp->view.cols;
1276         while (n-- > 0) {
1277                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1278                 line->cells[tp->cx + n].highlight = tp->highlight;
1279                 line->cells[tp->cx + n].f_color = tp->f_color;
1280         }
1281 }
1282
1283 /*
1284  * Delete characters at current position.
1285  */
1286 static void
1287 tty3270_delete_characters(struct tty3270 *tp, int n)
1288 {
1289         struct tty3270_line *line;
1290         int i;
1291
1292         line = tp->screen + tp->cy;
1293         if (line->len <= tp->cx)
1294                 return;
1295         if (line->len - tp->cx <= n) {
1296                 line->len = tp->cx;
1297                 return;
1298         }
1299         for (i = tp->cx; i + n < line->len; i++)
1300                 line->cells[i] = line->cells[i + n];
1301         line->len -= n;
1302 }
1303
1304 /*
1305  * Erase characters at current position.
1306  */
1307 static void
1308 tty3270_erase_characters(struct tty3270 *tp, int n)
1309 {
1310         struct tty3270_line *line;
1311         struct tty3270_cell *cell;
1312
1313         line = tp->screen + tp->cy;
1314         while (line->len > tp->cx && n-- > 0) {
1315                 cell = line->cells + tp->cx++;
1316                 cell->character = ' ';
1317                 cell->highlight = TAX_RESET;
1318                 cell->f_color = TAC_RESET;
1319         }
1320         tp->cx += n;
1321         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1322 }
1323
1324 /*
1325  * Erase line, 3 different cases:
1326  *  Esc [ 0 K   Erase from current position to end of line inclusive
1327  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1328  *  Esc [ 2 K   Erase entire line (without moving cursor)
1329  */
1330 static void
1331 tty3270_erase_line(struct tty3270 *tp, int mode)
1332 {
1333         struct tty3270_line *line;
1334         struct tty3270_cell *cell;
1335         int i;
1336
1337         line = tp->screen + tp->cy;
1338         if (mode == 0)
1339                 line->len = tp->cx;
1340         else if (mode == 1) {
1341                 for (i = 0; i < tp->cx; i++) {
1342                         cell = line->cells + i;
1343                         cell->character = ' ';
1344                         cell->highlight = TAX_RESET;
1345                         cell->f_color = TAC_RESET;
1346                 }
1347                 if (line->len <= tp->cx)
1348                         line->len = tp->cx + 1;
1349         } else if (mode == 2)
1350                 line->len = 0;
1351         tty3270_convert_line(tp, tp->cy);
1352 }
1353
1354 /*
1355  * Erase display, 3 different cases:
1356  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1357  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1358  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1359  */
1360 static void
1361 tty3270_erase_display(struct tty3270 *tp, int mode)
1362 {
1363         int i;
1364
1365         if (mode == 0) {
1366                 tty3270_erase_line(tp, 0);
1367                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1368                         tp->screen[i].len = 0;
1369                         tty3270_convert_line(tp, i);
1370                 }
1371         } else if (mode == 1) {
1372                 for (i = 0; i < tp->cy; i++) {
1373                         tp->screen[i].len = 0;
1374                         tty3270_convert_line(tp, i);
1375                 }
1376                 tty3270_erase_line(tp, 1);
1377         } else if (mode == 2) {
1378                 for (i = 0; i < tp->view.rows - 2; i++) {
1379                         tp->screen[i].len = 0;
1380                         tty3270_convert_line(tp, i);
1381                 }
1382         }
1383         tty3270_rebuild_update(tp);
1384 }
1385
1386 /*
1387  * Set attributes found in an escape sequence.
1388  *  Esc [ <attr> ; <attr> ; ... m
1389  */
1390 static void
1391 tty3270_set_attributes(struct tty3270 *tp)
1392 {
1393         static unsigned char f_colors[] = {
1394                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1395                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1396         };
1397         int i, attr;
1398
1399         for (i = 0; i <= tp->esc_npar; i++) {
1400                 attr = tp->esc_par[i];
1401                 switch (attr) {
1402                 case 0:         /* Reset */
1403                         tp->highlight = TAX_RESET;
1404                         tp->f_color = TAC_RESET;
1405                         break;
1406                 /* Highlight. */
1407                 case 4:         /* Start underlining. */
1408                         tp->highlight = TAX_UNDER;
1409                         break;
1410                 case 5:         /* Start blink. */
1411                         tp->highlight = TAX_BLINK;
1412                         break;
1413                 case 7:         /* Start reverse. */
1414                         tp->highlight = TAX_REVER;
1415                         break;
1416                 case 24:        /* End underlining */
1417                         if (tp->highlight == TAX_UNDER)
1418                                 tp->highlight = TAX_RESET;
1419                         break;
1420                 case 25:        /* End blink. */
1421                         if (tp->highlight == TAX_BLINK)
1422                                 tp->highlight = TAX_RESET;
1423                         break;
1424                 case 27:        /* End reverse. */
1425                         if (tp->highlight == TAX_REVER)
1426                                 tp->highlight = TAX_RESET;
1427                         break;
1428                 /* Foreground color. */
1429                 case 30:        /* Black */
1430                 case 31:        /* Red */
1431                 case 32:        /* Green */
1432                 case 33:        /* Yellow */
1433                 case 34:        /* Blue */
1434                 case 35:        /* Magenta */
1435                 case 36:        /* Cyan */
1436                 case 37:        /* White */
1437                 case 39:        /* Black */
1438                         tp->f_color = f_colors[attr - 30];
1439                         break;
1440                 }
1441         }
1442 }
1443
1444 static inline int
1445 tty3270_getpar(struct tty3270 *tp, int ix)
1446 {
1447         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1448 }
1449
1450 static void
1451 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1452 {
1453         int max_cx = max(0, cx);
1454         int max_cy = max(0, cy);
1455
1456         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1457         cy = min_t(int, tp->view.rows - 3, max_cy);
1458         if (cy != tp->cy) {
1459                 tty3270_convert_line(tp, tp->cy);
1460                 tp->cy = cy;
1461         }
1462 }
1463
1464 /*
1465  * Process escape sequences. Known sequences:
1466  *  Esc 7                       Save Cursor Position
1467  *  Esc 8                       Restore Cursor Position
1468  *  Esc [ Pn ; Pn ; .. m        Set attributes
1469  *  Esc [ Pn ; Pn H             Cursor Position
1470  *  Esc [ Pn ; Pn f             Cursor Position
1471  *  Esc [ Pn A                  Cursor Up
1472  *  Esc [ Pn B                  Cursor Down
1473  *  Esc [ Pn C                  Cursor Forward
1474  *  Esc [ Pn D                  Cursor Backward
1475  *  Esc [ Pn G                  Cursor Horizontal Absolute
1476  *  Esc [ Pn X                  Erase Characters
1477  *  Esc [ Ps J                  Erase in Display
1478  *  Esc [ Ps K                  Erase in Line
1479  * // FIXME: add all the new ones.
1480  *
1481  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1482  *  Ps is a selective parameter.
1483  */
1484 static void
1485 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1486 {
1487         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1488
1489         if (tp->esc_state == ESnormal) {
1490                 if (ch == 0x1b)
1491                         /* Starting new escape sequence. */
1492                         tp->esc_state = ESesc;
1493                 return;
1494         }
1495         if (tp->esc_state == ESesc) {
1496                 tp->esc_state = ESnormal;
1497                 switch (ch) {
1498                 case '[':
1499                         tp->esc_state = ESsquare;
1500                         break;
1501                 case 'E':
1502                         tty3270_cr(tp);
1503                         tty3270_lf(tp);
1504                         break;
1505                 case 'M':
1506                         tty3270_ri(tp);
1507                         break;
1508                 case 'D':
1509                         tty3270_lf(tp);
1510                         break;
1511                 case 'Z':               /* Respond ID. */
1512                         kbd_puts_queue(&tp->port, "\033[?6c");
1513                         break;
1514                 case '7':               /* Save cursor position. */
1515                         tp->saved_cx = tp->cx;
1516                         tp->saved_cy = tp->cy;
1517                         tp->saved_highlight = tp->highlight;
1518                         tp->saved_f_color = tp->f_color;
1519                         break;
1520                 case '8':               /* Restore cursor position. */
1521                         tty3270_convert_line(tp, tp->cy);
1522                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1523                         tp->highlight = tp->saved_highlight;
1524                         tp->f_color = tp->saved_f_color;
1525                         break;
1526                 case 'c':               /* Reset terminal. */
1527                         tp->cx = tp->saved_cx = 0;
1528                         tp->cy = tp->saved_cy = 0;
1529                         tp->highlight = tp->saved_highlight = TAX_RESET;
1530                         tp->f_color = tp->saved_f_color = TAC_RESET;
1531                         tty3270_erase_display(tp, 2);
1532                         break;
1533                 }
1534                 return;
1535         }
1536         if (tp->esc_state == ESsquare) {
1537                 tp->esc_state = ESgetpars;
1538                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1539                 tp->esc_npar = 0;
1540                 tp->esc_ques = (ch == '?');
1541                 if (tp->esc_ques)
1542                         return;
1543         }
1544         if (tp->esc_state == ESgetpars) {
1545                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1546                         tp->esc_npar++;
1547                         return;
1548                 }
1549                 if (ch >= '0' && ch <= '9') {
1550                         tp->esc_par[tp->esc_npar] *= 10;
1551                         tp->esc_par[tp->esc_npar] += ch - '0';
1552                         return;
1553                 }
1554         }
1555         tp->esc_state = ESnormal;
1556         if (ch == 'n' && !tp->esc_ques) {
1557                 if (tp->esc_par[0] == 5)                /* Status report. */
1558                         kbd_puts_queue(&tp->port, "\033[0n");
1559                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1560                         char buf[40];
1561                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1562                         kbd_puts_queue(&tp->port, buf);
1563                 }
1564                 return;
1565         }
1566         if (tp->esc_ques)
1567                 return;
1568         switch (ch) {
1569         case 'm':
1570                 tty3270_set_attributes(tp);
1571                 break;
1572         case 'H':       /* Set cursor position. */
1573         case 'f':
1574                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1575                                 tty3270_getpar(tp, 0) - 1);
1576                 break;
1577         case 'd':       /* Set y position. */
1578                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1579                 break;
1580         case 'A':       /* Cursor up. */
1581         case 'F':
1582                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1583                 break;
1584         case 'B':       /* Cursor down. */
1585         case 'e':
1586         case 'E':
1587                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1588                 break;
1589         case 'C':       /* Cursor forward. */
1590         case 'a':
1591                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1592                 break;
1593         case 'D':       /* Cursor backward. */
1594                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1595                 break;
1596         case 'G':       /* Set x position. */
1597         case '`':
1598                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1599                 break;
1600         case 'X':       /* Erase Characters. */
1601                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1602                 break;
1603         case 'J':       /* Erase display. */
1604                 tty3270_erase_display(tp, tp->esc_par[0]);
1605                 break;
1606         case 'K':       /* Erase line. */
1607                 tty3270_erase_line(tp, tp->esc_par[0]);
1608                 break;
1609         case 'P':       /* Delete characters. */
1610                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1611                 break;
1612         case '@':       /* Insert characters. */
1613                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1614                 break;
1615         case 's':       /* Save cursor position. */
1616                 tp->saved_cx = tp->cx;
1617                 tp->saved_cy = tp->cy;
1618                 tp->saved_highlight = tp->highlight;
1619                 tp->saved_f_color = tp->f_color;
1620                 break;
1621         case 'u':       /* Restore cursor position. */
1622                 tty3270_convert_line(tp, tp->cy);
1623                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1624                 tp->highlight = tp->saved_highlight;
1625                 tp->f_color = tp->saved_f_color;
1626                 break;
1627         }
1628 }
1629
1630 /*
1631  * String write routine for 3270 ttys
1632  */
1633 static void
1634 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1635                 const unsigned char *buf, int count)
1636 {
1637         int i_msg, i;
1638
1639         spin_lock_bh(&tp->view.lock);
1640         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1641                 if (tp->esc_state != 0) {
1642                         /* Continue escape sequence. */
1643                         tty3270_escape_sequence(tp, buf[i_msg]);
1644                         continue;
1645                 }
1646
1647                 switch (buf[i_msg]) {
1648                 case 0x07:              /* '\a' -- Alarm */
1649                         tp->wcc |= TW_PLUSALARM;
1650                         break;
1651                 case 0x08:              /* Backspace. */
1652                         if (tp->cx > 0) {
1653                                 tp->cx--;
1654                                 tty3270_put_character(tp, ' ');
1655                         }
1656                         break;
1657                 case 0x09:              /* '\t' -- Tabulate */
1658                         for (i = tp->cx % 8; i < 8; i++) {
1659                                 if (tp->cx >= tp->view.cols) {
1660                                         tty3270_cr(tp);
1661                                         tty3270_lf(tp);
1662                                         break;
1663                                 }
1664                                 tty3270_put_character(tp, ' ');
1665                                 tp->cx++;
1666                         }
1667                         break;
1668                 case 0x0a:              /* '\n' -- New Line */
1669                         tty3270_cr(tp);
1670                         tty3270_lf(tp);
1671                         break;
1672                 case 0x0c:              /* '\f' -- Form Feed */
1673                         tty3270_erase_display(tp, 2);
1674                         tp->cx = tp->cy = 0;
1675                         break;
1676                 case 0x0d:              /* '\r' -- Carriage Return */
1677                         tp->cx = 0;
1678                         break;
1679                 case 0x0f:              /* SuSE "exit alternate mode" */
1680                         break;
1681                 case 0x1b:              /* Start escape sequence. */
1682                         tty3270_escape_sequence(tp, buf[i_msg]);
1683                         break;
1684                 default:                /* Insert normal character. */
1685                         if (tp->cx >= tp->view.cols) {
1686                                 tty3270_cr(tp);
1687                                 tty3270_lf(tp);
1688                         }
1689                         tty3270_put_character(tp, buf[i_msg]);
1690                         tp->cx++;
1691                         break;
1692                 }
1693         }
1694         /* Convert current line to 3270 data fragment. */
1695         tty3270_convert_line(tp, tp->cy);
1696
1697         /* Setup timer to update display after 1/10 second */
1698         if (!timer_pending(&tp->timer))
1699                 tty3270_set_timer(tp, HZ/10);
1700
1701         spin_unlock_bh(&tp->view.lock);
1702 }
1703
1704 /*
1705  * String write routine for 3270 ttys
1706  */
1707 static int
1708 tty3270_write(struct tty_struct * tty,
1709               const unsigned char *buf, int count)
1710 {
1711         struct tty3270 *tp;
1712
1713         tp = tty->driver_data;
1714         if (!tp)
1715                 return 0;
1716         if (tp->char_count > 0) {
1717                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1718                 tp->char_count = 0;
1719         }
1720         tty3270_do_write(tp, tty, buf, count);
1721         return count;
1722 }
1723
1724 /*
1725  * Put single characters to the ttys character buffer
1726  */
1727 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1728 {
1729         struct tty3270 *tp;
1730
1731         tp = tty->driver_data;
1732         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1733                 return 0;
1734         tp->char_buf[tp->char_count++] = ch;
1735         return 1;
1736 }
1737
1738 /*
1739  * Flush all characters from the ttys characeter buffer put there
1740  * by tty3270_put_char.
1741  */
1742 static void
1743 tty3270_flush_chars(struct tty_struct *tty)
1744 {
1745         struct tty3270 *tp;
1746
1747         tp = tty->driver_data;
1748         if (!tp)
1749                 return;
1750         if (tp->char_count > 0) {
1751                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1752                 tp->char_count = 0;
1753         }
1754 }
1755
1756 /*
1757  * Returns the number of characters in the output buffer. This is
1758  * used in tty_wait_until_sent to wait until all characters have
1759  * appeared on the screen.
1760  */
1761 static int
1762 tty3270_chars_in_buffer(struct tty_struct *tty)
1763 {
1764         return 0;
1765 }
1766
1767 static void
1768 tty3270_flush_buffer(struct tty_struct *tty)
1769 {
1770 }
1771
1772 /*
1773  * Check for visible/invisible input switches
1774  */
1775 static void
1776 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1777 {
1778         struct tty3270 *tp;
1779         int new;
1780
1781         tp = tty->driver_data;
1782         if (!tp)
1783                 return;
1784         spin_lock_bh(&tp->view.lock);
1785         if (L_ICANON(tty)) {
1786                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1787                 if (new != tp->inattr) {
1788                         tp->inattr = new;
1789                         tty3270_update_prompt(tp, NULL, 0);
1790                         tty3270_set_timer(tp, 1);
1791                 }
1792         }
1793         spin_unlock_bh(&tp->view.lock);
1794 }
1795
1796 /*
1797  * Disable reading from a 3270 tty
1798  */
1799 static void
1800 tty3270_throttle(struct tty_struct * tty)
1801 {
1802         struct tty3270 *tp;
1803
1804         tp = tty->driver_data;
1805         if (!tp)
1806                 return;
1807         tp->throttle = 1;
1808 }
1809
1810 /*
1811  * Enable reading from a 3270 tty
1812  */
1813 static void
1814 tty3270_unthrottle(struct tty_struct * tty)
1815 {
1816         struct tty3270 *tp;
1817
1818         tp = tty->driver_data;
1819         if (!tp)
1820                 return;
1821         tp->throttle = 0;
1822         if (tp->attn)
1823                 tty3270_issue_read(tp, 1);
1824 }
1825
1826 /*
1827  * Hang up the tty device.
1828  */
1829 static void
1830 tty3270_hangup(struct tty_struct *tty)
1831 {
1832         struct tty3270 *tp;
1833
1834         tp = tty->driver_data;
1835         if (!tp)
1836                 return;
1837         spin_lock_bh(&tp->view.lock);
1838         tp->cx = tp->saved_cx = 0;
1839         tp->cy = tp->saved_cy = 0;
1840         tp->highlight = tp->saved_highlight = TAX_RESET;
1841         tp->f_color = tp->saved_f_color = TAC_RESET;
1842         tty3270_blank_screen(tp);
1843         while (tp->nr_lines < tp->view.rows - 2)
1844                 tty3270_blank_line(tp);
1845         tp->update_flags = TTY_UPDATE_ALL;
1846         spin_unlock_bh(&tp->view.lock);
1847         tty3270_set_timer(tp, 1);
1848 }
1849
1850 static void
1851 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1852 {
1853 }
1854
1855 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1856                          unsigned long arg)
1857 {
1858         struct tty3270 *tp;
1859
1860         tp = tty->driver_data;
1861         if (!tp)
1862                 return -ENODEV;
1863         if (tty_io_error(tty))
1864                 return -EIO;
1865         return kbd_ioctl(tp->kbd, cmd, arg);
1866 }
1867
1868 #ifdef CONFIG_COMPAT
1869 static long tty3270_compat_ioctl(struct tty_struct *tty,
1870                                  unsigned int cmd, unsigned long arg)
1871 {
1872         struct tty3270 *tp;
1873
1874         tp = tty->driver_data;
1875         if (!tp)
1876                 return -ENODEV;
1877         if (tty_io_error(tty))
1878                 return -EIO;
1879         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1880 }
1881 #endif
1882
1883 static const struct tty_operations tty3270_ops = {
1884         .install = tty3270_install,
1885         .cleanup = tty3270_cleanup,
1886         .open = tty3270_open,
1887         .close = tty3270_close,
1888         .write = tty3270_write,
1889         .put_char = tty3270_put_char,
1890         .flush_chars = tty3270_flush_chars,
1891         .write_room = tty3270_write_room,
1892         .chars_in_buffer = tty3270_chars_in_buffer,
1893         .flush_buffer = tty3270_flush_buffer,
1894         .throttle = tty3270_throttle,
1895         .unthrottle = tty3270_unthrottle,
1896         .hangup = tty3270_hangup,
1897         .wait_until_sent = tty3270_wait_until_sent,
1898         .ioctl = tty3270_ioctl,
1899 #ifdef CONFIG_COMPAT
1900         .compat_ioctl = tty3270_compat_ioctl,
1901 #endif
1902         .set_termios = tty3270_set_termios
1903 };
1904
1905 static void tty3270_create_cb(int minor)
1906 {
1907         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1908 }
1909
1910 static void tty3270_destroy_cb(int minor)
1911 {
1912         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1913 }
1914
1915 static struct raw3270_notifier tty3270_notifier =
1916 {
1917         .create = tty3270_create_cb,
1918         .destroy = tty3270_destroy_cb,
1919 };
1920
1921 /*
1922  * 3270 tty registration code called from tty_init().
1923  * Most kernel services (incl. kmalloc) are available at this poimt.
1924  */
1925 static int __init tty3270_init(void)
1926 {
1927         struct tty_driver *driver;
1928         int ret;
1929
1930         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1931                                   TTY_DRIVER_REAL_RAW |
1932                                   TTY_DRIVER_DYNAMIC_DEV |
1933                                   TTY_DRIVER_RESET_TERMIOS);
1934         if (IS_ERR(driver))
1935                 return PTR_ERR(driver);
1936
1937         /*
1938          * Initialize the tty_driver structure
1939          * Entries in tty3270_driver that are NOT initialized:
1940          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1941          */
1942         driver->driver_name = "tty3270";
1943         driver->name = "3270/tty";
1944         driver->major = IBM_TTY3270_MAJOR;
1945         driver->minor_start = RAW3270_FIRSTMINOR;
1946         driver->name_base = RAW3270_FIRSTMINOR;
1947         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1948         driver->subtype = SYSTEM_TYPE_TTY;
1949         driver->init_termios = tty_std_termios;
1950         tty_set_operations(driver, &tty3270_ops);
1951         ret = tty_register_driver(driver);
1952         if (ret) {
1953                 put_tty_driver(driver);
1954                 return ret;
1955         }
1956         tty3270_driver = driver;
1957         raw3270_register_notifier(&tty3270_notifier);
1958         return 0;
1959 }
1960
1961 static void __exit
1962 tty3270_exit(void)
1963 {
1964         struct tty_driver *driver;
1965
1966         raw3270_unregister_notifier(&tty3270_notifier);
1967         driver = tty3270_driver;
1968         tty3270_driver = NULL;
1969         tty_unregister_driver(driver);
1970         put_tty_driver(driver);
1971         tty3270_del_views();
1972 }
1973
1974 MODULE_LICENSE("GPL");
1975 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1976
1977 module_init(tty3270_init);
1978 module_exit(tty3270_exit);