drivers/s390/char/tty3270.c

   1 /*
   2  *  drivers/s390/char/tty3270.c
   3  *    IBM/3270 Driver - tty functions.
   4  *
   5  *  Author(s):
   6  *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   7  *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  *      -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kdev_t.h>
  14 #include <linux/tty.h>
  15 #include <linux/vt_kern.h>
  16 #include <linux/init.h>
  17 #include <linux/console.h>
  18 #include <linux/interrupt.h>
  19
  20 #include <linux/slab.h>
  21 #include <linux/bootmem.h>
  22
  23 #include <asm/ccwdev.h>
  24 #include <asm/cio.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/uaccess.h>
  27
  28
  29 #include "raw3270.h"
  30 #include "keyboard.h"
  31
  32 #define TTY3270_CHAR_BUF_SIZE 256
  33 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
  34 #define TTY3270_STRING_PAGES 5
  35
  36 struct tty_driver *tty3270_driver;
  37 static int tty3270_max_index;
  38
  39 struct raw3270_fn tty3270_fn;
  40
  41 struct tty3270_cell {
  42         unsigned char character;
  43         unsigned char highlight;
  44         unsigned char f_color;
  45 };
  46
  47 struct tty3270_line {
  48         struct tty3270_cell *cells;
  49         int len;
  50 };
  51
  52 #define ESCAPE_NPAR 8
  53
  54 /*
  55  * The main tty view data structure.
  56  * FIXME:
  57  * 1) describe line orientation & lines list concept against screen
  58  * 2) describe conversion of screen to lines
  59  * 3) describe line format.
  60  */
  61 struct tty3270 {
  62         struct raw3270_view view;
  63         struct tty_struct *tty;         /* Pointer to tty structure */
  64         void **freemem_pages;           /* Array of pages used for freemem. */
  65         struct list_head freemem;       /* List of free memory for strings. */
  66
  67         /* Output stuff. */
  68         struct list_head lines;         /* List of lines. */
  69         struct list_head update;        /* List of lines to update. */
  70         unsigned char wcc;              /* Write control character. */
  71         int nr_lines;                   /* # lines in list. */
  72         int nr_up;                      /* # lines up in history. */
  73         unsigned long update_flags;     /* Update indication bits. */
  74         struct string *status;          /* Lower right of display. */
  75         struct raw3270_request *write;  /* Single write request. */
  76         struct timer_list timer;        /* Output delay timer. */
  77
  78         /* Current tty screen. */
  79         unsigned int cx, cy;            /* Current output position. */
  80         unsigned int highlight;         /* Blink/reverse/underscore */
  81         unsigned int f_color;           /* Foreground color */
  82         struct tty3270_line *screen;
  83
  84         /* Input stuff. */
  85         struct string *prompt;          /* Output string for input area. */
  86         struct string *input;           /* Input string for read request. */
  87         struct raw3270_request *read;   /* Single read request. */
  88         struct raw3270_request *kreset; /* Single keyboard reset request. */
  89         unsigned char inattr;           /* Visible/invisible input. */
  90         int throttle, attn;             /* tty throttle/unthrottle. */
  91         struct tasklet_struct readlet;  /* Tasklet to issue read request. */
  92         struct kbd_data *kbd;           /* key_maps stuff. */
  93
  94         /* Escape sequence parsing. */
  95         int esc_state, esc_ques, esc_npar;
  96         int esc_par[ESCAPE_NPAR];
  97         unsigned int saved_cx, saved_cy;
  98         unsigned int saved_highlight, saved_f_color;
  99
 100         /* Command recalling. */
 101         struct list_head rcl_lines;     /* List of recallable lines. */
 102         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
 103         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
 104
 105         /* Character array for put_char/flush_chars. */
 106         unsigned int char_count;
 107         char char_buf[TTY3270_CHAR_BUF_SIZE];
 108 };
 109
 110 /* tty3270->update_flags. See tty3270_update for details. */
 111 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
 112 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
 113 #define TTY_UPDATE_INPUT        4       /* Update input line. */
 114 #define TTY_UPDATE_STATUS       8       /* Update status line. */
 115 #define TTY_UPDATE_ALL          15
 116
 117 static void tty3270_update(struct tty3270 *);
 118
 119 /*
 120  * Setup timeout for a device. On timeout trigger an update.
 121  */
 122 void
 123 tty3270_set_timer(struct tty3270 *tp, int expires)
 124 {
 125         if (expires == 0) {
 126                 if (timer_pending(&tp->timer) && del_timer(&tp->timer))
 127                         raw3270_put_view(&tp->view);
 128                 return;
 129         }
 130         if (timer_pending(&tp->timer) &&
 131             mod_timer(&tp->timer, jiffies + expires))
 132                 return;
 133         raw3270_get_view(&tp->view);
 134         tp->timer.function = (void (*)(unsigned long)) tty3270_update;
 135         tp->timer.data = (unsigned long) tp;
 136         tp->timer.expires = jiffies + expires;
 137         add_timer(&tp->timer);
 138 }
 139
 140 /*
 141  * The input line are the two last lines of the screen.
 142  */
 143 static void
 144 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
 145 {
 146         struct string *line;
 147         unsigned int off;
 148
 149         line = tp->prompt;
 150         if (count != 0)
 151                 line->string[5] = TF_INMDT;
 152         else
 153                 line->string[5] = tp->inattr;
 154         if (count > tp->view.cols * 2 - 11)
 155                 count = tp->view.cols * 2 - 11;
 156         memcpy(line->string + 6, input, count);
 157         line->string[6 + count] = TO_IC;
 158         /* Clear to end of input line. */
 159         if (count < tp->view.cols * 2 - 11) {
 160                 line->string[7 + count] = TO_RA;
 161                 line->string[10 + count] = 0;
 162                 off = tp->view.cols * tp->view.rows - 9;
 163                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
 164                 line->len = 11 + count;
 165         } else
 166                 line->len = 7 + count;
 167         tp->update_flags |= TTY_UPDATE_INPUT;
 168 }
 169
 170 static void
 171 tty3270_create_prompt(struct tty3270 *tp)
 172 {
 173         static const unsigned char blueprint[] =
 174                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
 175                   /* empty input string */
 176                   TO_IC, TO_RA, 0, 0, 0 };
 177         struct string *line;
 178         unsigned int offset;
 179
 180         line = alloc_string(&tp->freemem,
 181                             sizeof(blueprint) + tp->view.cols * 2 - 9);
 182         tp->prompt = line;
 183         tp->inattr = TF_INPUT;
 184         /* Copy blueprint to status line */
 185         memcpy(line->string, blueprint, sizeof(blueprint));
 186         line->len = sizeof(blueprint);
 187         /* Set output offsets. */
 188         offset = tp->view.cols * (tp->view.rows - 2);
 189         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 190         offset = tp->view.cols * tp->view.rows - 9;
 191         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
 192
 193         /* Allocate input string for reading. */
 194         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
 195 }
 196
 197 /*
 198  * The status line is the last line of the screen. It shows the string
 199  * "Running"/"Holding" in the lower right corner of the screen.
 200  */
 201 static void
 202 tty3270_update_status(struct tty3270 * tp)
 203 {
 204         char *str;
 205
 206         str = (tp->nr_up != 0) ? "History" : "Running";
 207         memcpy(tp->status->string + 8, str, 7);
 208         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 209         tp->update_flags |= TTY_UPDATE_STATUS;
 210 }
 211
 212 static void
 213 tty3270_create_status(struct tty3270 * tp)
 214 {
 215         static const unsigned char blueprint[] =
 216                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
 217                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
 218                   TAC_RESET };
 219         struct string *line;
 220         unsigned int offset;
 221
 222         line = alloc_string(&tp->freemem,sizeof(blueprint));
 223         tp->status = line;
 224         /* Copy blueprint to status line */
 225         memcpy(line->string, blueprint, sizeof(blueprint));
 226         /* Set address to start of status string (= last 9 characters). */
 227         offset = tp->view.cols * tp->view.rows - 9;
 228         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 229 }
 230
 231 /*
 232  * Set output offsets to 3270 datastream fragment of a tty string.
 233  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
 234  */
 235 static void
 236 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
 237 {
 238         unsigned char *cp;
 239
 240         raw3270_buffer_address(tp->view.dev, line->string + 1,
 241                                tp->view.cols * nr);
 242         cp = line->string + line->len - 4;
 243         if (*cp == TO_RA)
 244                 raw3270_buffer_address(tp->view.dev, cp + 1,
 245                                        tp->view.cols * (nr + 1));
 246 }
 247
 248 /*
 249  * Rebuild update list to print all lines.
 250  */
 251 static void
 252 tty3270_rebuild_update(struct tty3270 *tp)
 253 {
 254         struct string *s, *n;
 255         int line, nr_up;
 256
 257         /*
 258          * Throw away update list and create a new one,
 259          * containing all lines that will fit on the screen.
 260          */
 261         list_for_each_entry_safe(s, n, &tp->update, update)
 262                 list_del_init(&s->update);
 263         line = tp->view.rows - 3;
 264         nr_up = tp->nr_up;
 265         list_for_each_entry_reverse(s, &tp->lines, list) {
 266                 if (nr_up > 0) {
 267                         nr_up--;
 268                         continue;
 269                 }
 270                 tty3270_update_string(tp, s, line);
 271                 list_add(&s->update, &tp->update);
 272                 if (--line < 0)
 273                         break;
 274         }
 275         tp->update_flags |= TTY_UPDATE_LIST;
 276 }
 277
 278 /*
 279  * Alloc string for size bytes. If there is not enough room in
 280  * freemem, free strings until there is room.
 281  */
 282 static struct string *
 283 tty3270_alloc_string(struct tty3270 *tp, size_t size)
 284 {
 285         struct string *s, *n;
 286
 287         s = alloc_string(&tp->freemem, size);
 288         if (s)
 289                 return s;
 290         list_for_each_entry_safe(s, n, &tp->lines, list) {
 291                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
 292                 list_del(&s->list);
 293                 if (!list_empty(&s->update))
 294                         list_del(&s->update);
 295                 tp->nr_lines--;
 296                 if (free_string(&tp->freemem, s) >= size)
 297                         break;
 298         }
 299         s = alloc_string(&tp->freemem, size);
 300         BUG_ON(!s);
 301         if (tp->nr_up != 0 &&
 302             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
 303                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
 304                 tty3270_rebuild_update(tp);
 305                 tty3270_update_status(tp);
 306         }
 307         return s;
 308 }
 309
 310 /*
 311  * Add an empty line to the list.
 312  */
 313 static void
 314 tty3270_blank_line(struct tty3270 *tp)
 315 {
 316         static const unsigned char blueprint[] =
 317                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
 318                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
 319         struct string *s;
 320
 321         s = tty3270_alloc_string(tp, sizeof(blueprint));
 322         memcpy(s->string, blueprint, sizeof(blueprint));
 323         s->len = sizeof(blueprint);
 324         list_add_tail(&s->list, &tp->lines);
 325         tp->nr_lines++;
 326         if (tp->nr_up != 0)
 327                 tp->nr_up++;
 328 }
 329
 330 /*
 331  * Write request completion callback.
 332  */
 333 static void
 334 tty3270_write_callback(struct raw3270_request *rq, void *data)
 335 {
 336         struct tty3270 *tp;
 337
 338         tp = (struct tty3270 *) rq->view;
 339         if (rq->rc != 0) {
 340                 /* Write wasn't successfull. Refresh all. */
 341                 tty3270_rebuild_update(tp);
 342                 tp->update_flags = TTY_UPDATE_ALL;
 343                 tty3270_set_timer(tp, 1);
 344         }
 345         raw3270_request_reset(rq);
 346         xchg(&tp->write, rq);
 347 }
 348
 349 /*
 350  * Update 3270 display.
 351  */
 352 static void
 353 tty3270_update(struct tty3270 *tp)
 354 {
 355         static char invalid_sba[2] = { 0xff, 0xff };
 356         struct raw3270_request *wrq;
 357         unsigned long updated;
 358         struct string *s, *n;
 359         char *sba, *str;
 360         int rc, len;
 361
 362         wrq = xchg(&tp->write, 0);
 363         if (!wrq) {
 364                 tty3270_set_timer(tp, 1);
 365                 return;
 366         }
 367
 368         spin_lock(&tp->view.lock);
 369         updated = 0;
 370         if (tp->update_flags & TTY_UPDATE_ERASE) {
 371                 /* Use erase write alternate to erase display. */
 372                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 373                 updated |= TTY_UPDATE_ERASE;
 374         } else
 375                 raw3270_request_set_cmd(wrq, TC_WRITE);
 376
 377         raw3270_request_add_data(wrq, &tp->wcc, 1);
 378         tp->wcc = TW_NONE;
 379
 380         /*
 381          * Update status line.
 382          */
 383         if (tp->update_flags & TTY_UPDATE_STATUS)
 384                 if (raw3270_request_add_data(wrq, tp->status->string,
 385                                              tp->status->len) == 0)
 386                         updated |= TTY_UPDATE_STATUS;
 387
 388         /*
 389          * Write input line.
 390          */
 391         if (tp->update_flags & TTY_UPDATE_INPUT)
 392                 if (raw3270_request_add_data(wrq, tp->prompt->string,
 393                                              tp->prompt->len) == 0)
 394                         updated |= TTY_UPDATE_INPUT;
 395
 396         sba = invalid_sba;
 397
 398         if (tp->update_flags & TTY_UPDATE_LIST) {
 399                 /* Write strings in the update list to the screen. */
 400                 list_for_each_entry_safe(s, n, &tp->update, update) {
 401                         str = s->string;
 402                         len = s->len;
 403                         /*
 404                          * Skip TO_SBA at the start of the string if the
 405                          * last output position matches the start address
 406                          * of this line.
 407                          */
 408                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
 409                                 str += 3, len -= 3;
 410                         if (raw3270_request_add_data(wrq, str, len) != 0)
 411                                 break;
 412                         list_del_init(&s->update);
 413                         sba = s->string + s->len - 3;
 414                 }
 415                 if (list_empty(&tp->update))
 416                         updated |= TTY_UPDATE_LIST;
 417         }
 418         wrq->callback = tty3270_write_callback;
 419         rc = raw3270_start(&tp->view, wrq);
 420         if (rc == 0) {
 421                 tp->update_flags &= ~updated;
 422                 if (tp->update_flags)
 423                         tty3270_set_timer(tp, 1);
 424         } else {
 425                 raw3270_request_reset(wrq);
 426                 xchg(&tp->write, wrq);
 427         }
 428         spin_unlock(&tp->view.lock);
 429         raw3270_put_view(&tp->view);
 430 }
 431
 432 /*
 433  * Command recalling.
 434  */
 435 static void
 436 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
 437 {
 438         struct string *s;
 439
 440         tp->rcl_walk = NULL;
 441         if (len <= 0)
 442                 return;
 443         if (tp->rcl_nr >= tp->rcl_max) {
 444                 s = list_entry(tp->rcl_lines.next, struct string, list);
 445                 list_del(&s->list);
 446                 free_string(&tp->freemem, s);
 447                 tp->rcl_nr--;
 448         }
 449         s = tty3270_alloc_string(tp, len);
 450         memcpy(s->string, input, len);
 451         list_add_tail(&s->list, &tp->rcl_lines);
 452         tp->rcl_nr++;
 453 }
 454
 455 static void
 456 tty3270_rcl_backward(struct kbd_data *kbd)
 457 {
 458         struct tty3270 *tp;
 459         struct string *s;
 460
 461         tp = kbd->tty->driver_data;
 462         spin_lock_bh(&tp->view.lock);
 463         if (tp->inattr == TF_INPUT) {
 464                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
 465                         tp->rcl_walk = tp->rcl_walk->prev;
 466                 else if (!list_empty(&tp->rcl_lines))
 467                         tp->rcl_walk = tp->rcl_lines.prev;
 468                 s = tp->rcl_walk ?
 469                         list_entry(tp->rcl_walk, struct string, list) : NULL;
 470                 if (tp->rcl_walk) {
 471                         s = list_entry(tp->rcl_walk, struct string, list);
 472                         tty3270_update_prompt(tp, s->string, s->len);
 473                 } else
 474                         tty3270_update_prompt(tp, NULL, 0);
 475                 tty3270_set_timer(tp, 1);
 476         }
 477         spin_unlock_bh(&tp->view.lock);
 478 }
 479
 480 /*
 481  * Deactivate tty view.
 482  */
 483 static void
 484 tty3270_exit_tty(struct kbd_data *kbd)
 485 {
 486         struct tty3270 *tp;
 487
 488         tp = kbd->tty->driver_data;
 489         raw3270_deactivate_view(&tp->view);
 490 }
 491
 492 /*
 493  * Scroll forward in history.
 494  */
 495 static void
 496 tty3270_scroll_forward(struct kbd_data *kbd)
 497 {
 498         struct tty3270 *tp;
 499         int nr_up;
 500
 501         tp = kbd->tty->driver_data;
 502         spin_lock_bh(&tp->view.lock);
 503         nr_up = tp->nr_up - tp->view.rows + 2;
 504         if (nr_up < 0)
 505                 nr_up = 0;
 506         if (nr_up != tp->nr_up) {
 507                 tp->nr_up = nr_up;
 508                 tty3270_rebuild_update(tp);
 509                 tty3270_update_status(tp);
 510                 tty3270_set_timer(tp, 1);
 511         }
 512         spin_unlock_bh(&tp->view.lock);
 513 }
 514
 515 /*
 516  * Scroll backward in history.
 517  */
 518 static void
 519 tty3270_scroll_backward(struct kbd_data *kbd)
 520 {
 521         struct tty3270 *tp;
 522         int nr_up;
 523
 524         tp = kbd->tty->driver_data;
 525         spin_lock_bh(&tp->view.lock);
 526         nr_up = tp->nr_up + tp->view.rows - 2;
 527         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
 528                 nr_up = tp->nr_lines - tp->view.rows + 2;
 529         if (nr_up != tp->nr_up) {
 530                 tp->nr_up = nr_up;
 531                 tty3270_rebuild_update(tp);
 532                 tty3270_update_status(tp);
 533                 tty3270_set_timer(tp, 1);
 534         }
 535         spin_unlock_bh(&tp->view.lock);
 536 }
 537
 538 /*
 539  * Pass input line to tty.
 540  */
 541 static void
 542 tty3270_read_tasklet(struct raw3270_request *rrq)
 543 {
 544         static char kreset_data = TW_KR;
 545         struct tty3270 *tp;
 546         char *input;
 547         int len;
 548
 549         tp = (struct tty3270 *) rrq->view;
 550         spin_lock_bh(&tp->view.lock);
 551         /*
 552          * Two AID keys are special: For 0x7d (enter) the input line
 553          * has to be emitted to the tty and for 0x6d the screen
 554          * needs to be redrawn.
 555          */
 556         input = NULL;
 557         len = 0;
 558         if (tp->input->string[0] == 0x7d) {
 559                 /* Enter: write input to tty. */
 560                 input = tp->input->string + 6;
 561                 len = tp->input->len - 6 - rrq->rescnt;
 562                 if (tp->inattr != TF_INPUTN)
 563                         tty3270_rcl_add(tp, input, len);
 564                 if (tp->nr_up > 0) {
 565                         tp->nr_up = 0;
 566                         tty3270_rebuild_update(tp);
 567                         tty3270_update_status(tp);
 568                 }
 569                 /* Clear input area. */
 570                 tty3270_update_prompt(tp, NULL, 0);
 571                 tty3270_set_timer(tp, 1);
 572         } else if (tp->input->string[0] == 0x6d) {
 573                 /* Display has been cleared. Redraw. */
 574                 tty3270_rebuild_update(tp);
 575                 tp->update_flags = TTY_UPDATE_ALL;
 576                 tty3270_set_timer(tp, 1);
 577         }
 578         spin_unlock_bh(&tp->view.lock);
 579
 580         /* Start keyboard reset command. */
 581         raw3270_request_reset(tp->kreset);
 582         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
 583         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
 584         raw3270_start(&tp->view, tp->kreset);
 585
 586         /* Emit input string. */
 587         if (tp->tty) {
 588                 while (len-- > 0)
 589                         kbd_keycode(tp->kbd, *input++);
 590                 /* Emit keycode for AID byte. */
 591                 kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
 592         }
 593
 594         raw3270_request_reset(rrq);
 595         xchg(&tp->read, rrq);
 596         raw3270_put_view(&tp->view);
 597 }
 598
 599 /*
 600  * Read request completion callback.
 601  */
 602 static void
 603 tty3270_read_callback(struct raw3270_request *rq, void *data)
 604 {
 605         raw3270_get_view(rq->view);
 606         /* Schedule tasklet to pass input to tty. */
 607         tasklet_schedule(&((struct tty3270 *) rq->view)->readlet);
 608 }
 609
 610 /*
 611  * Issue a read request. Call with device lock.
 612  */
 613 static void
 614 tty3270_issue_read(struct tty3270 *tp, int lock)
 615 {
 616         struct raw3270_request *rrq;
 617         int rc;
 618
 619         rrq = xchg(&tp->read, 0);
 620         if (!rrq)
 621                 /* Read already scheduled. */
 622                 return;
 623         rrq->callback = tty3270_read_callback;
 624         rrq->callback_data = tp;
 625         raw3270_request_set_cmd(rrq, TC_READMOD);
 626         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
 627         /* Issue the read modified request. */
 628         if (lock) {
 629                 rc = raw3270_start(&tp->view, rrq);
 630         } else
 631                 rc = raw3270_start_irq(&tp->view, rrq);
 632         if (rc) {
 633                 raw3270_request_reset(rrq);
 634                 xchg(&tp->read, rrq);
 635         }
 636 }
 637
 638 /*
 639  * Switch to the tty view.
 640  */
 641 static int
 642 tty3270_activate(struct raw3270_view *view)
 643 {
 644         struct tty3270 *tp;
 645         unsigned long flags;
 646
 647         tp = (struct tty3270 *) view;
 648         spin_lock_irqsave(&tp->view.lock, flags);
 649         tp->nr_up = 0;
 650         tty3270_rebuild_update(tp);
 651         tty3270_update_status(tp);
 652         tp->update_flags = TTY_UPDATE_ALL;
 653         tty3270_set_timer(tp, 1);
 654         spin_unlock_irqrestore(&tp->view.lock, flags);
 655         return 0;
 656 }
 657
 658 static void
 659 tty3270_deactivate(struct raw3270_view *view)
 660 {
 661 }
 662
 663 static int
 664 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 665 {
 666         /* Handle ATTN. Schedule tasklet to read aid. */
 667         if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
 668                 if (!tp->throttle)
 669                         tty3270_issue_read(tp, 0);
 670                 else
 671                         tp->attn = 1;
 672         }
 673
 674         if (rq) {
 675                 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
 676                         rq->rc = -EIO;
 677                 else
 678                         /* Normal end. Copy residual count. */
 679                         rq->rescnt = irb->scsw.count;
 680         }
 681         return RAW3270_IO_DONE;
 682 }
 683
 684 /*
 685  * Allocate tty3270 structure.
 686  */
 687 static struct tty3270 *
 688 tty3270_alloc_view(void)
 689 {
 690         struct tty3270 *tp;
 691         int pages;
 692
 693         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
 694         if (!tp)
 695                 goto out_err;
 696         tp->freemem_pages =
 697                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 698         if (!tp->freemem_pages)
 699                 goto out_tp;
 700         INIT_LIST_HEAD(&tp->freemem);
 701         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 702                 tp->freemem_pages[pages] = (void *)
 703                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 704                 if (!tp->freemem_pages[pages])
 705                         goto out_pages;
 706                 add_string_memory(&tp->freemem,
 707                                   tp->freemem_pages[pages], PAGE_SIZE);
 708         }
 709         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 710         if (IS_ERR(tp->write))
 711                 goto out_pages;
 712         tp->read = raw3270_request_alloc(0);
 713         if (IS_ERR(tp->read))
 714                 goto out_write;
 715         tp->kreset = raw3270_request_alloc(1);
 716         if (IS_ERR(tp->kreset))
 717                 goto out_read;
 718         tp->kbd = kbd_alloc();
 719         if (!tp->kbd)
 720                 goto out_reset;
 721         return tp;
 722
 723 out_reset:
 724         raw3270_request_free(tp->kreset);
 725 out_read:
 726         raw3270_request_free(tp->read);
 727 out_write:
 728         raw3270_request_free(tp->write);
 729 out_pages:
 730         while (pages--)
 731                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 732         kfree(tp->freemem_pages);
 733 out_tp:
 734         kfree(tp);
 735 out_err:
 736         return ERR_PTR(-ENOMEM);
 737 }
 738
 739 /*
 740  * Free tty3270 structure.
 741  */
 742 static void
 743 tty3270_free_view(struct tty3270 *tp)
 744 {
 745         int pages;
 746
 747         kbd_free(tp->kbd);
 748         raw3270_request_free(tp->kreset);
 749         raw3270_request_free(tp->read);
 750         raw3270_request_free(tp->write);
 751         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 752                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 753         kfree(tp->freemem_pages);
 754         kfree(tp);
 755 }
 756
 757 /*
 758  * Allocate tty3270 screen.
 759  */
 760 static int
 761 tty3270_alloc_screen(struct tty3270 *tp)
 762 {
 763         unsigned long size;
 764         int lines;
 765
 766         size = sizeof(struct tty3270_line) * (tp->view.rows - 2);
 767         tp->screen = kzalloc(size, GFP_KERNEL);
 768         if (!tp->screen)
 769                 goto out_err;
 770         for (lines = 0; lines < tp->view.rows - 2; lines++) {
 771                 size = sizeof(struct tty3270_cell) * tp->view.cols;
 772                 tp->screen[lines].cells = kzalloc(size, GFP_KERNEL);
 773                 if (!tp->screen[lines].cells)
 774                         goto out_screen;
 775         }
 776         return 0;
 777 out_screen:
 778         while (lines--)
 779                 kfree(tp->screen[lines].cells);
 780         kfree(tp->screen);
 781 out_err:
 782         return -ENOMEM;
 783 }
 784
 785 /*
 786  * Free tty3270 screen.
 787  */
 788 static void
 789 tty3270_free_screen(struct tty3270 *tp)
 790 {
 791         int lines;
 792
 793         for (lines = 0; lines < tp->view.rows - 2; lines++)
 794                 kfree(tp->screen[lines].cells);
 795         kfree(tp->screen);
 796 }
 797
 798 /*
 799  * Unlink tty3270 data structure from tty.
 800  */
 801 static void
 802 tty3270_release(struct raw3270_view *view)
 803 {
 804         struct tty3270 *tp;
 805         struct tty_struct *tty;
 806
 807         tp = (struct tty3270 *) view;
 808         tty = tp->tty;
 809         if (tty) {
 810                 tty->driver_data = NULL;
 811                 tp->tty = tp->kbd->tty = NULL;
 812                 tty_hangup(tty);
 813                 raw3270_put_view(&tp->view);
 814         }
 815 }
 816
 817 /*
 818  * Free tty3270 data structure
 819  */
 820 static void
 821 tty3270_free(struct raw3270_view *view)
 822 {
 823         tty3270_free_screen((struct tty3270 *) view);
 824         tty3270_free_view((struct tty3270 *) view);
 825 }
 826
 827 /*
 828  * Delayed freeing of tty3270 views.
 829  */
 830 static void
 831 tty3270_del_views(void)
 832 {
 833         struct tty3270 *tp;
 834         int i;
 835
 836         for (i = 0; i < tty3270_max_index; i++) {
 837                 tp = (struct tty3270 *)
 838                         raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
 839                 if (!IS_ERR(tp))
 840                         raw3270_del_view(&tp->view);
 841         }
 842 }
 843
 844 struct raw3270_fn tty3270_fn = {
 845         .activate = tty3270_activate,
 846         .deactivate = tty3270_deactivate,
 847         .intv = (void *) tty3270_irq,
 848         .release = tty3270_release,
 849         .free = tty3270_free
 850 };
 851
 852 /*
 853  * This routine is called whenever a 3270 tty is opened.
 854  */
 855 static int
 856 tty3270_open(struct tty_struct *tty, struct file * filp)
 857 {
 858         struct tty3270 *tp;
 859         int i, rc;
 860
 861         if (tty->count > 1)
 862                 return 0;
 863         /* Check if the tty3270 is already there. */
 864         tp = (struct tty3270 *)
 865                 raw3270_find_view(&tty3270_fn,
 866                                   tty->index + RAW3270_FIRSTMINOR);
 867         if (!IS_ERR(tp)) {
 868                 tty->driver_data = tp;
 869                 tty->winsize.ws_row = tp->view.rows - 2;
 870                 tty->winsize.ws_col = tp->view.cols;
 871                 tty->low_latency = 0;
 872                 tp->tty = tty;
 873                 tp->kbd->tty = tty;
 874                 tp->inattr = TF_INPUT;
 875                 return 0;
 876         }
 877         if (tty3270_max_index < tty->index + 1)
 878                 tty3270_max_index = tty->index + 1;
 879
 880         /* Quick exit if there is no device for tty->index. */
 881         if (PTR_ERR(tp) == -ENODEV)
 882                 return -ENODEV;
 883
 884         /* Allocate tty3270 structure on first open. */
 885         tp = tty3270_alloc_view();
 886         if (IS_ERR(tp))
 887                 return PTR_ERR(tp);
 888
 889         INIT_LIST_HEAD(&tp->lines);
 890         INIT_LIST_HEAD(&tp->update);
 891         INIT_LIST_HEAD(&tp->rcl_lines);
 892         tp->rcl_max = 20;
 893         init_timer(&tp->timer);
 894         tasklet_init(&tp->readlet,
 895                      (void (*)(unsigned long)) tty3270_read_tasklet,
 896                      (unsigned long) tp->read);
 897
 898         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 899                               tty->index + RAW3270_FIRSTMINOR);
 900         if (rc) {
 901                 tty3270_free_view(tp);
 902                 return rc;
 903         }
 904
 905         rc = tty3270_alloc_screen(tp);
 906         if (rc) {
 907                 raw3270_put_view(&tp->view);
 908                 raw3270_del_view(&tp->view);
 909                 return rc;
 910         }
 911
 912         tp->tty = tty;
 913         tty->low_latency = 0;
 914         tty->driver_data = tp;
 915         tty->winsize.ws_row = tp->view.rows - 2;
 916         tty->winsize.ws_col = tp->view.cols;
 917
 918         tty3270_create_prompt(tp);
 919         tty3270_create_status(tp);
 920         tty3270_update_status(tp);
 921
 922         /* Create blank line for every line in the tty output area. */
 923         for (i = 0; i < tp->view.rows - 2; i++)
 924                 tty3270_blank_line(tp);
 925
 926         tp->kbd->tty = tty;
 927         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
 928         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
 929         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
 930         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
 931         kbd_ascebc(tp->kbd, tp->view.ascebc);
 932
 933         raw3270_activate_view(&tp->view);
 934         return 0;
 935 }
 936
 937 /*
 938  * This routine is called when the 3270 tty is closed. We wait
 939  * for the remaining request to be completed. Then we clean up.
 940  */
 941 static void
 942 tty3270_close(struct tty_struct *tty, struct file * filp)
 943 {
 944         struct tty3270 *tp;
 945
 946         if (tty->count > 1)
 947                 return;
 948         tp = (struct tty3270 *) tty->driver_data;
 949         if (tp) {
 950                 tty->driver_data = NULL;
 951                 tp->tty = tp->kbd->tty = NULL;
 952                 raw3270_put_view(&tp->view);
 953         }
 954 }
 955
 956 /*
 957  * We always have room.
 958  */
 959 static int
 960 tty3270_write_room(struct tty_struct *tty)
 961 {
 962         return INT_MAX;
 963 }
 964
 965 /*
 966  * Insert character into the screen at the current position with the
 967  * current color and highlight. This function does NOT do cursor movement.
 968  */
 969 static void
 970 tty3270_put_character(struct tty3270 *tp, char ch)
 971 {
 972         struct tty3270_line *line;
 973         struct tty3270_cell *cell;
 974
 975         line = tp->screen + tp->cy;
 976         if (line->len <= tp->cx) {
 977                 while (line->len < tp->cx) {
 978                         cell = line->cells + line->len;
 979                         cell->character = tp->view.ascebc[' '];
 980                         cell->highlight = tp->highlight;
 981                         cell->f_color = tp->f_color;
 982                         line->len++;
 983                 }
 984                 line->len++;
 985         }
 986         cell = line->cells + tp->cx;
 987         cell->character = tp->view.ascebc[(unsigned int) ch];
 988         cell->highlight = tp->highlight;
 989         cell->f_color = tp->f_color;
 990 }
 991
 992 /*
 993  * Convert a tty3270_line to a 3270 data fragment usable for output.
 994  */
 995 static void
 996 tty3270_convert_line(struct tty3270 *tp, int line_nr)
 997 {
 998         struct tty3270_line *line;
 999         struct tty3270_cell *cell;
1000         struct string *s, *n;
1001         unsigned char highlight;
1002         unsigned char f_color;
1003         char *cp;
1004         int flen, i;
1005
1006         /* Determine how long the fragment will be. */
1007         flen = 3;               /* Prefix (TO_SBA). */
1008         line = tp->screen + line_nr;
1009         flen += line->len;
1010         highlight = TAX_RESET;
1011         f_color = TAC_RESET;
1012         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1013                 if (cell->highlight != highlight) {
1014                         flen += 3;      /* TO_SA to switch highlight. */
1015                         highlight = cell->highlight;
1016                 }
1017                 if (cell->f_color != f_color) {
1018                         flen += 3;      /* TO_SA to switch color. */
1019                         f_color = cell->f_color;
1020                 }
1021         }
1022         if (highlight != TAX_RESET)
1023                 flen += 3;      /* TO_SA to reset hightlight. */
1024         if (f_color != TAC_RESET)
1025                 flen += 3;      /* TO_SA to reset color. */
1026         if (line->len < tp->view.cols)
1027                 flen += 4;      /* Postfix (TO_RA). */
1028
1029         /* Find the line in the list. */
1030         i = tp->view.rows - 2 - line_nr;
1031         list_for_each_entry_reverse(s, &tp->lines, list)
1032                 if (--i <= 0)
1033                         break;
1034         /*
1035          * Check if the line needs to get reallocated.
1036          */
1037         if (s->len != flen) {
1038                 /* Reallocate string. */
1039                 n = tty3270_alloc_string(tp, flen);
1040                 list_add(&n->list, &s->list);
1041                 list_del_init(&s->list);
1042                 if (!list_empty(&s->update))
1043                         list_del_init(&s->update);
1044                 free_string(&tp->freemem, s);
1045                 s = n;
1046         }
1047
1048         /* Write 3270 data fragment. */
1049         cp = s->string;
1050         *cp++ = TO_SBA;
1051         *cp++ = 0;
1052         *cp++ = 0;
1053
1054         highlight = TAX_RESET;
1055         f_color = TAC_RESET;
1056         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1057                 if (cell->highlight != highlight) {
1058                         *cp++ = TO_SA;
1059                         *cp++ = TAT_EXTHI;
1060                         *cp++ = cell->highlight;
1061                         highlight = cell->highlight;
1062                 }
1063                 if (cell->f_color != f_color) {
1064                         *cp++ = TO_SA;
1065                         *cp++ = TAT_COLOR;
1066                         *cp++ = cell->f_color;
1067                         f_color = cell->f_color;
1068                 }
1069                 *cp++ = cell->character;
1070         }
1071         if (highlight != TAX_RESET) {
1072                 *cp++ = TO_SA;
1073                 *cp++ = TAT_EXTHI;
1074                 *cp++ = TAX_RESET;
1075         }
1076         if (f_color != TAC_RESET) {
1077                 *cp++ = TO_SA;
1078                 *cp++ = TAT_COLOR;
1079                 *cp++ = TAC_RESET;
1080         }
1081         if (line->len < tp->view.cols) {
1082                 *cp++ = TO_RA;
1083                 *cp++ = 0;
1084                 *cp++ = 0;
1085                 *cp++ = 0;
1086         }
1087
1088         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1089                 /* Line is currently visible on screen. */
1090                 tty3270_update_string(tp, s, line_nr);
1091                 /* Add line to update list. */
1092                 if (list_empty(&s->update)) {
1093                         list_add_tail(&s->update, &tp->update);
1094                         tp->update_flags |= TTY_UPDATE_LIST;
1095                 }
1096         }
1097 }
1098
1099 /*
1100  * Do carriage return.
1101  */
1102 static void
1103 tty3270_cr(struct tty3270 *tp)
1104 {
1105         tp->cx = 0;
1106 }
1107
1108 /*
1109  * Do line feed.
1110  */
1111 static void
1112 tty3270_lf(struct tty3270 *tp)
1113 {
1114         struct tty3270_line temp;
1115         int i;
1116
1117         tty3270_convert_line(tp, tp->cy);
1118         if (tp->cy < tp->view.rows - 3) {
1119                 tp->cy++;
1120                 return;
1121         }
1122         /* Last line just filled up. Add new, blank line. */
1123         tty3270_blank_line(tp);
1124         temp = tp->screen[0];
1125         temp.len = 0;
1126         for (i = 0; i < tp->view.rows - 3; i++)
1127                 tp->screen[i] = tp->screen[i+1];
1128         tp->screen[tp->view.rows - 3] = temp;
1129         tty3270_rebuild_update(tp);
1130 }
1131
1132 static void
1133 tty3270_ri(struct tty3270 *tp)
1134 {
1135         if (tp->cy > 0) {
1136             tty3270_convert_line(tp, tp->cy);
1137             tp->cy--;
1138         }
1139 }
1140
1141 /*
1142  * Insert characters at current position.
1143  */
1144 static void
1145 tty3270_insert_characters(struct tty3270 *tp, int n)
1146 {
1147         struct tty3270_line *line;
1148         int k;
1149
1150         line = tp->screen + tp->cy;
1151         while (line->len < tp->cx) {
1152                 line->cells[line->len].character = tp->view.ascebc[' '];
1153                 line->cells[line->len].highlight = TAX_RESET;
1154                 line->cells[line->len].f_color = TAC_RESET;
1155                 line->len++;
1156         }
1157         if (n > tp->view.cols - tp->cx)
1158                 n = tp->view.cols - tp->cx;
1159         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1160         while (k--)
1161                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1162         line->len += n;
1163         if (line->len > tp->view.cols)
1164                 line->len = tp->view.cols;
1165         while (n-- > 0) {
1166                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1167                 line->cells[tp->cx + n].highlight = tp->highlight;
1168                 line->cells[tp->cx + n].f_color = tp->f_color;
1169         }
1170 }
1171
1172 /*
1173  * Delete characters at current position.
1174  */
1175 static void
1176 tty3270_delete_characters(struct tty3270 *tp, int n)
1177 {
1178         struct tty3270_line *line;
1179         int i;
1180
1181         line = tp->screen + tp->cy;
1182         if (line->len <= tp->cx)
1183                 return;
1184         if (line->len - tp->cx <= n) {
1185                 line->len = tp->cx;
1186                 return;
1187         }
1188         for (i = tp->cx; i + n < line->len; i++)
1189                 line->cells[i] = line->cells[i + n];
1190         line->len -= n;
1191 }
1192
1193 /*
1194  * Erase characters at current position.
1195  */
1196 static void
1197 tty3270_erase_characters(struct tty3270 *tp, int n)
1198 {
1199         struct tty3270_line *line;
1200         struct tty3270_cell *cell;
1201
1202         line = tp->screen + tp->cy;
1203         while (line->len > tp->cx && n-- > 0) {
1204                 cell = line->cells + tp->cx++;
1205                 cell->character = ' ';
1206                 cell->highlight = TAX_RESET;
1207                 cell->f_color = TAC_RESET;
1208         }
1209         tp->cx += n;
1210         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1211 }
1212
1213 /*
1214  * Erase line, 3 different cases:
1215  *  Esc [ 0 K   Erase from current position to end of line inclusive
1216  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1217  *  Esc [ 2 K   Erase entire line (without moving cursor)
1218  */
1219 static void
1220 tty3270_erase_line(struct tty3270 *tp, int mode)
1221 {
1222         struct tty3270_line *line;
1223         struct tty3270_cell *cell;
1224         int i;
1225
1226         line = tp->screen + tp->cy;
1227         if (mode == 0)
1228                 line->len = tp->cx;
1229         else if (mode == 1) {
1230                 for (i = 0; i < tp->cx; i++) {
1231                         cell = line->cells + i;
1232                         cell->character = ' ';
1233                         cell->highlight = TAX_RESET;
1234                         cell->f_color = TAC_RESET;
1235                 }
1236                 if (line->len <= tp->cx)
1237                         line->len = tp->cx + 1;
1238         } else if (mode == 2)
1239                 line->len = 0;
1240         tty3270_convert_line(tp, tp->cy);
1241 }
1242
1243 /*
1244  * Erase display, 3 different cases:
1245  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1246  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1247  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1248  */
1249 static void
1250 tty3270_erase_display(struct tty3270 *tp, int mode)
1251 {
1252         int i;
1253
1254         if (mode == 0) {
1255                 tty3270_erase_line(tp, 0);
1256                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1257                         tp->screen[i].len = 0;
1258                         tty3270_convert_line(tp, i);
1259                 }
1260         } else if (mode == 1) {
1261                 for (i = 0; i < tp->cy; i++) {
1262                         tp->screen[i].len = 0;
1263                         tty3270_convert_line(tp, i);
1264                 }
1265                 tty3270_erase_line(tp, 1);
1266         } else if (mode == 2) {
1267                 for (i = 0; i < tp->view.rows - 2; i++) {
1268                         tp->screen[i].len = 0;
1269                         tty3270_convert_line(tp, i);
1270                 }
1271         }
1272         tty3270_rebuild_update(tp);
1273 }
1274
1275 /*
1276  * Set attributes found in an escape sequence.
1277  *  Esc [ <attr> ; <attr> ; ... m
1278  */
1279 static void
1280 tty3270_set_attributes(struct tty3270 *tp)
1281 {
1282         static unsigned char f_colors[] = {
1283                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1284                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1285         };
1286         int i, attr;
1287
1288         for (i = 0; i <= tp->esc_npar; i++) {
1289                 attr = tp->esc_par[i];
1290                 switch (attr) {
1291                 case 0:         /* Reset */
1292                         tp->highlight = TAX_RESET;
1293                         tp->f_color = TAC_RESET;
1294                         break;
1295                 /* Highlight. */
1296                 case 4:         /* Start underlining. */
1297                         tp->highlight = TAX_UNDER;
1298                         break;
1299                 case 5:         /* Start blink. */
1300                         tp->highlight = TAX_BLINK;
1301                         break;
1302                 case 7:         /* Start reverse. */
1303                         tp->highlight = TAX_REVER;
1304                         break;
1305                 case 24:        /* End underlining */
1306                         if (tp->highlight == TAX_UNDER)
1307                                 tp->highlight = TAX_RESET;
1308                         break;
1309                 case 25:        /* End blink. */
1310                         if (tp->highlight == TAX_BLINK)
1311                                 tp->highlight = TAX_RESET;
1312                         break;
1313                 case 27:        /* End reverse. */
1314                         if (tp->highlight == TAX_REVER)
1315                                 tp->highlight = TAX_RESET;
1316                         break;
1317                 /* Foreground color. */
1318                 case 30:        /* Black */
1319                 case 31:        /* Red */
1320                 case 32:        /* Green */
1321                 case 33:        /* Yellow */
1322                 case 34:        /* Blue */
1323                 case 35:        /* Magenta */
1324                 case 36:        /* Cyan */
1325                 case 37:        /* White */
1326                 case 39:        /* Black */
1327                         tp->f_color = f_colors[attr - 30];
1328                         break;
1329                 }
1330         }
1331 }
1332
1333 static inline int
1334 tty3270_getpar(struct tty3270 *tp, int ix)
1335 {
1336         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1337 }
1338
1339 static void
1340 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1341 {
1342         tp->cx = min_t(int, tp->view.cols - 1, max_t(int, 0, cx));
1343         cy = min_t(int, tp->view.rows - 3, max_t(int, 0, cy));
1344         if (cy != tp->cy) {
1345                 tty3270_convert_line(tp, tp->cy);
1346                 tp->cy = cy;
1347         }
1348 }
1349
1350 /*
1351  * Process escape sequences. Known sequences:
1352  *  Esc 7                       Save Cursor Position
1353  *  Esc 8                       Restore Cursor Position
1354  *  Esc [ Pn ; Pn ; .. m        Set attributes
1355  *  Esc [ Pn ; Pn H             Cursor Position
1356  *  Esc [ Pn ; Pn f             Cursor Position
1357  *  Esc [ Pn A                  Cursor Up
1358  *  Esc [ Pn B                  Cursor Down
1359  *  Esc [ Pn C                  Cursor Forward
1360  *  Esc [ Pn D                  Cursor Backward
1361  *  Esc [ Pn G                  Cursor Horizontal Absolute
1362  *  Esc [ Pn X                  Erase Characters
1363  *  Esc [ Ps J                  Erase in Display
1364  *  Esc [ Ps K                  Erase in Line
1365  * // FIXME: add all the new ones.
1366  *
1367  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1368  *  Ps is a selective parameter.
1369  */
1370 static void
1371 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1372 {
1373         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1374
1375         if (tp->esc_state == ESnormal) {
1376                 if (ch == 0x1b)
1377                         /* Starting new escape sequence. */
1378                         tp->esc_state = ESesc;
1379                 return;
1380         }
1381         if (tp->esc_state == ESesc) {
1382                 tp->esc_state = ESnormal;
1383                 switch (ch) {
1384                 case '[':
1385                         tp->esc_state = ESsquare;
1386                         break;
1387                 case 'E':
1388                         tty3270_cr(tp);
1389                         tty3270_lf(tp);
1390                         break;
1391                 case 'M':
1392                         tty3270_ri(tp);
1393                         break;
1394                 case 'D':
1395                         tty3270_lf(tp);
1396                         break;
1397                 case 'Z':               /* Respond ID. */
1398                         kbd_puts_queue(tp->tty, "\033[?6c");
1399                         break;
1400                 case '7':               /* Save cursor position. */
1401                         tp->saved_cx = tp->cx;
1402                         tp->saved_cy = tp->cy;
1403                         tp->saved_highlight = tp->highlight;
1404                         tp->saved_f_color = tp->f_color;
1405                         break;
1406                 case '8':               /* Restore cursor position. */
1407                         tty3270_convert_line(tp, tp->cy);
1408                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1409                         tp->highlight = tp->saved_highlight;
1410                         tp->f_color = tp->saved_f_color;
1411                         break;
1412                 case 'c':               /* Reset terminal. */
1413                         tp->cx = tp->saved_cx = 0;
1414                         tp->cy = tp->saved_cy = 0;
1415                         tp->highlight = tp->saved_highlight = TAX_RESET;
1416                         tp->f_color = tp->saved_f_color = TAC_RESET;
1417                         tty3270_erase_display(tp, 2);
1418                         break;
1419                 }
1420                 return;
1421         }
1422         if (tp->esc_state == ESsquare) {
1423                 tp->esc_state = ESgetpars;
1424                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1425                 tp->esc_npar = 0;
1426                 tp->esc_ques = (ch == '?');
1427                 if (tp->esc_ques)
1428                         return;
1429         }
1430         if (tp->esc_state == ESgetpars) {
1431                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1432                         tp->esc_npar++;
1433                         return;
1434                 }
1435                 if (ch >= '0' && ch <= '9') {
1436                         tp->esc_par[tp->esc_npar] *= 10;
1437                         tp->esc_par[tp->esc_npar] += ch - '0';
1438                         return;
1439                 }
1440         }
1441         tp->esc_state = ESnormal;
1442         if (ch == 'n' && !tp->esc_ques) {
1443                 if (tp->esc_par[0] == 5)                /* Status report. */
1444                         kbd_puts_queue(tp->tty, "\033[0n");
1445                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1446                         char buf[40];
1447                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1448                         kbd_puts_queue(tp->tty, buf);
1449                 }
1450                 return;
1451         }
1452         if (tp->esc_ques)
1453                 return;
1454         switch (ch) {
1455         case 'm':
1456                 tty3270_set_attributes(tp);
1457                 break;
1458         case 'H':       /* Set cursor position. */
1459         case 'f':
1460                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1461                                 tty3270_getpar(tp, 0) - 1);
1462                 break;
1463         case 'd':       /* Set y position. */
1464                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1465                 break;
1466         case 'A':       /* Cursor up. */
1467         case 'F':
1468                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1469                 break;
1470         case 'B':       /* Cursor down. */
1471         case 'e':
1472         case 'E':
1473                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1474                 break;
1475         case 'C':       /* Cursor forward. */
1476         case 'a':
1477                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1478                 break;
1479         case 'D':       /* Cursor backward. */
1480                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1481                 break;
1482         case 'G':       /* Set x position. */
1483         case '`':
1484                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1485                 break;
1486         case 'X':       /* Erase Characters. */
1487                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1488                 break;
1489         case 'J':       /* Erase display. */
1490                 tty3270_erase_display(tp, tp->esc_par[0]);
1491                 break;
1492         case 'K':       /* Erase line. */
1493                 tty3270_erase_line(tp, tp->esc_par[0]);
1494                 break;
1495         case 'P':       /* Delete characters. */
1496                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1497                 break;
1498         case '@':       /* Insert characters. */
1499                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1500                 break;
1501         case 's':       /* Save cursor position. */
1502                 tp->saved_cx = tp->cx;
1503                 tp->saved_cy = tp->cy;
1504                 tp->saved_highlight = tp->highlight;
1505                 tp->saved_f_color = tp->f_color;
1506                 break;
1507         case 'u':       /* Restore cursor position. */
1508                 tty3270_convert_line(tp, tp->cy);
1509                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1510                 tp->highlight = tp->saved_highlight;
1511                 tp->f_color = tp->saved_f_color;
1512                 break;
1513         }
1514 }
1515
1516 /*
1517  * String write routine for 3270 ttys
1518  */
1519 static void
1520 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1521 {
1522         int i_msg, i;
1523
1524         spin_lock_bh(&tp->view.lock);
1525         for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1526                 if (tp->esc_state != 0) {
1527                         /* Continue escape sequence. */
1528                         tty3270_escape_sequence(tp, buf[i_msg]);
1529                         continue;
1530                 }
1531
1532                 switch (buf[i_msg]) {
1533                 case 0x07:              /* '\a' -- Alarm */
1534                         tp->wcc |= TW_PLUSALARM;
1535                         break;
1536                 case 0x08:              /* Backspace. */
1537                         if (tp->cx > 0) {
1538                                 tp->cx--;
1539                                 tty3270_put_character(tp, ' ');
1540                         }
1541                         break;
1542                 case 0x09:              /* '\t' -- Tabulate */
1543                         for (i = tp->cx % 8; i < 8; i++) {
1544                                 if (tp->cx >= tp->view.cols) {
1545                                         tty3270_cr(tp);
1546                                         tty3270_lf(tp);
1547                                         break;
1548                                 }
1549                                 tty3270_put_character(tp, ' ');
1550                                 tp->cx++;
1551                         }
1552                         break;
1553                 case 0x0a:              /* '\n' -- New Line */
1554                         tty3270_cr(tp);
1555                         tty3270_lf(tp);
1556                         break;
1557                 case 0x0c:              /* '\f' -- Form Feed */
1558                         tty3270_erase_display(tp, 2);
1559                         tp->cx = tp->cy = 0;
1560                         break;
1561                 case 0x0d:              /* '\r' -- Carriage Return */
1562                         tp->cx = 0;
1563                         break;
1564                 case 0x0f:              /* SuSE "exit alternate mode" */
1565                         break;
1566                 case 0x1b:              /* Start escape sequence. */
1567                         tty3270_escape_sequence(tp, buf[i_msg]);
1568                         break;
1569                 default:                /* Insert normal character. */
1570                         if (tp->cx >= tp->view.cols) {
1571                                 tty3270_cr(tp);
1572                                 tty3270_lf(tp);
1573                         }
1574                         tty3270_put_character(tp, buf[i_msg]);
1575                         tp->cx++;
1576                         break;
1577                 }
1578         }
1579         /* Convert current line to 3270 data fragment. */
1580         tty3270_convert_line(tp, tp->cy);
1581
1582         /* Setup timer to update display after 1/10 second */
1583         if (!timer_pending(&tp->timer))
1584                 tty3270_set_timer(tp, HZ/10);
1585
1586         spin_unlock_bh(&tp->view.lock);
1587 }
1588
1589 /*
1590  * String write routine for 3270 ttys
1591  */
1592 static int
1593 tty3270_write(struct tty_struct * tty,
1594               const unsigned char *buf, int count)
1595 {
1596         struct tty3270 *tp;
1597
1598         tp = tty->driver_data;
1599         if (!tp)
1600                 return 0;
1601         if (tp->char_count > 0) {
1602                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1603                 tp->char_count = 0;
1604         }
1605         tty3270_do_write(tp, buf, count);
1606         return count;
1607 }
1608
1609 /*
1610  * Put single characters to the ttys character buffer
1611  */
1612 static void
1613 tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1614 {
1615         struct tty3270 *tp;
1616
1617         tp = tty->driver_data;
1618         if (!tp)
1619                 return;
1620         if (tp->char_count < TTY3270_CHAR_BUF_SIZE)
1621                 tp->char_buf[tp->char_count++] = ch;
1622 }
1623
1624 /*
1625  * Flush all characters from the ttys characeter buffer put there
1626  * by tty3270_put_char.
1627  */
1628 static void
1629 tty3270_flush_chars(struct tty_struct *tty)
1630 {
1631         struct tty3270 *tp;
1632
1633         tp = tty->driver_data;
1634         if (!tp)
1635                 return;
1636         if (tp->char_count > 0) {
1637                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1638                 tp->char_count = 0;
1639         }
1640 }
1641
1642 /*
1643  * Returns the number of characters in the output buffer. This is
1644  * used in tty_wait_until_sent to wait until all characters have
1645  * appeared on the screen.
1646  */
1647 static int
1648 tty3270_chars_in_buffer(struct tty_struct *tty)
1649 {
1650         return 0;
1651 }
1652
1653 static void
1654 tty3270_flush_buffer(struct tty_struct *tty)
1655 {
1656 }
1657
1658 /*
1659  * Check for visible/invisible input switches
1660  */
1661 static void
1662 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1663 {
1664         struct tty3270 *tp;
1665         int new;
1666
1667         tp = tty->driver_data;
1668         if (!tp)
1669                 return;
1670         spin_lock_bh(&tp->view.lock);
1671         if (L_ICANON(tty)) {
1672                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1673                 if (new != tp->inattr) {
1674                         tp->inattr = new;
1675                         tty3270_update_prompt(tp, NULL, 0);
1676                         tty3270_set_timer(tp, 1);
1677                 }
1678         }
1679         spin_unlock_bh(&tp->view.lock);
1680 }
1681
1682 /*
1683  * Disable reading from a 3270 tty
1684  */
1685 static void
1686 tty3270_throttle(struct tty_struct * tty)
1687 {
1688         struct tty3270 *tp;
1689
1690         tp = tty->driver_data;
1691         if (!tp)
1692                 return;
1693         tp->throttle = 1;
1694 }
1695
1696 /*
1697  * Enable reading from a 3270 tty
1698  */
1699 static void
1700 tty3270_unthrottle(struct tty_struct * tty)
1701 {
1702         struct tty3270 *tp;
1703
1704         tp = tty->driver_data;
1705         if (!tp)
1706                 return;
1707         tp->throttle = 0;
1708         if (tp->attn)
1709                 tty3270_issue_read(tp, 1);
1710 }
1711
1712 /*
1713  * Hang up the tty device.
1714  */
1715 static void
1716 tty3270_hangup(struct tty_struct *tty)
1717 {
1718         // FIXME: implement
1719 }
1720
1721 static void
1722 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1723 {
1724 }
1725
1726 static int
1727 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1728               unsigned int cmd, unsigned long arg)
1729 {
1730         struct tty3270 *tp;
1731
1732         tp = tty->driver_data;
1733         if (!tp)
1734                 return -ENODEV;
1735         if (tty->flags & (1 << TTY_IO_ERROR))
1736                 return -EIO;
1737         return kbd_ioctl(tp->kbd, file, cmd, arg);
1738 }
1739
1740 static const struct tty_operations tty3270_ops = {
1741         .open = tty3270_open,
1742         .close = tty3270_close,
1743         .write = tty3270_write,
1744         .put_char = tty3270_put_char,
1745         .flush_chars = tty3270_flush_chars,
1746         .write_room = tty3270_write_room,
1747         .chars_in_buffer = tty3270_chars_in_buffer,
1748         .flush_buffer = tty3270_flush_buffer,
1749         .throttle = tty3270_throttle,
1750         .unthrottle = tty3270_unthrottle,
1751         .hangup = tty3270_hangup,
1752         .wait_until_sent = tty3270_wait_until_sent,
1753         .ioctl = tty3270_ioctl,
1754         .set_termios = tty3270_set_termios
1755 };
1756
1757 void
1758 tty3270_notifier(int index, int active)
1759 {
1760         if (active)
1761                 tty_register_device(tty3270_driver, index, NULL);
1762         else
1763                 tty_unregister_device(tty3270_driver, index);
1764 }
1765
1766 /*
1767  * 3270 tty registration code called from tty_init().
1768  * Most kernel services (incl. kmalloc) are available at this poimt.
1769  */
1770 int __init
1771 tty3270_init(void)
1772 {
1773         struct tty_driver *driver;
1774         int ret;
1775
1776         driver = alloc_tty_driver(RAW3270_MAXDEVS);
1777         if (!driver)
1778                 return -ENOMEM;
1779
1780         /*
1781          * Initialize the tty_driver structure
1782          * Entries in tty3270_driver that are NOT initialized:
1783          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1784          */
1785         driver->owner = THIS_MODULE;
1786         driver->driver_name = "ttyTUB";
1787         driver->name = "ttyTUB";
1788         driver->major = IBM_TTY3270_MAJOR;
1789         driver->minor_start = RAW3270_FIRSTMINOR;
1790         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1791         driver->subtype = SYSTEM_TYPE_TTY;
1792         driver->init_termios = tty_std_termios;
1793         driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV;
1794         tty_set_operations(driver, &tty3270_ops);
1795         ret = tty_register_driver(driver);
1796         if (ret) {
1797                 printk(KERN_ERR "tty3270 registration failed with %d\n", ret);
1798                 put_tty_driver(driver);
1799                 return ret;
1800         }
1801         tty3270_driver = driver;
1802         ret = raw3270_register_notifier(tty3270_notifier);
1803         if (ret) {
1804                 printk(KERN_ERR "tty3270 notifier registration failed "
1805                        "with %d\n", ret);
1806                 put_tty_driver(driver);
1807                 return ret;
1808
1809         }
1810         return 0;
1811 }
1812
1813 static void __exit
1814 tty3270_exit(void)
1815 {
1816         struct tty_driver *driver;
1817
1818         raw3270_unregister_notifier(tty3270_notifier);
1819         driver = tty3270_driver;
1820         tty3270_driver = NULL;
1821         tty_unregister_driver(driver);
1822         tty3270_del_views();
1823 }
1824
1825 MODULE_LICENSE("GPL");
1826 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1827
1828 module_init(tty3270_init);
1829 module_exit(tty3270_exit);