drivers/s390/char/tty3270.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   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 IBM Corp. 2003
   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 #include <linux/workqueue.h>
  20
  21 #include <linux/slab.h>
  22 #include <linux/memblock.h>
  23 #include <linux/compat.h>
  24
  25 #include <asm/ccwdev.h>
  26 #include <asm/cio.h>
  27 #include <asm/ebcdic.h>
  28 #include <linux/uaccess.h>
  29
  30 #include "raw3270.h"
  31 #include "tty3270.h"
  32 #include "keyboard.h"
  33
  34 #define TTY3270_CHAR_BUF_SIZE 256
  35 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
  36 #define TTY3270_STRING_PAGES 5
  37
  38 struct tty_driver *tty3270_driver;
  39 static int tty3270_max_index;
  40
  41 static struct raw3270_fn tty3270_fn;
  42
  43 struct tty3270_cell {
  44         unsigned char character;
  45         unsigned char highlight;
  46         unsigned char f_color;
  47 };
  48
  49 struct tty3270_line {
  50         struct tty3270_cell *cells;
  51         int len;
  52 };
  53
  54 #define ESCAPE_NPAR 8
  55
  56 /*
  57  * The main tty view data structure.
  58  * FIXME:
  59  * 1) describe line orientation & lines list concept against screen
  60  * 2) describe conversion of screen to lines
  61  * 3) describe line format.
  62  */
  63 struct tty3270 {
  64         struct raw3270_view view;
  65         struct tty_port port;
  66         void **freemem_pages;           /* Array of pages used for freemem. */
  67         struct list_head freemem;       /* List of free memory for strings. */
  68
  69         /* Output stuff. */
  70         struct list_head lines;         /* List of lines. */
  71         struct list_head update;        /* List of lines to update. */
  72         unsigned char wcc;              /* Write control character. */
  73         int nr_lines;                   /* # lines in list. */
  74         int nr_up;                      /* # lines up in history. */
  75         unsigned long update_flags;     /* Update indication bits. */
  76         struct string *status;          /* Lower right of display. */
  77         struct raw3270_request *write;  /* Single write request. */
  78         struct timer_list timer;        /* Output delay timer. */
  79
  80         /* Current tty screen. */
  81         unsigned int cx, cy;            /* Current output position. */
  82         unsigned int highlight;         /* Blink/reverse/underscore */
  83         unsigned int f_color;           /* Foreground color */
  84         struct tty3270_line *screen;
  85         unsigned int n_model, n_cols, n_rows;   /* New model & size */
  86         struct work_struct resize_work;
  87
  88         /* Input stuff. */
  89         struct string *prompt;          /* Output string for input area. */
  90         struct string *input;           /* Input string for read request. */
  91         struct raw3270_request *read;   /* Single read request. */
  92         struct raw3270_request *kreset; /* Single keyboard reset request. */
  93         unsigned char inattr;           /* Visible/invisible input. */
  94         int throttle, attn;             /* tty throttle/unthrottle. */
  95         struct tasklet_struct readlet;  /* Tasklet to issue read request. */
  96         struct tasklet_struct hanglet;  /* Tasklet to hang up the tty. */
  97         struct kbd_data *kbd;           /* key_maps stuff. */
  98
  99         /* Escape sequence parsing. */
 100         int esc_state, esc_ques, esc_npar;
 101         int esc_par[ESCAPE_NPAR];
 102         unsigned int saved_cx, saved_cy;
 103         unsigned int saved_highlight, saved_f_color;
 104
 105         /* Command recalling. */
 106         struct list_head rcl_lines;     /* List of recallable lines. */
 107         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
 108         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
 109
 110         /* Character array for put_char/flush_chars. */
 111         unsigned int char_count;
 112         char char_buf[TTY3270_CHAR_BUF_SIZE];
 113 };
 114
 115 /* tty3270->update_flags. See tty3270_update for details. */
 116 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
 117 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
 118 #define TTY_UPDATE_INPUT        4       /* Update input line. */
 119 #define TTY_UPDATE_STATUS       8       /* Update status line. */
 120 #define TTY_UPDATE_ALL          16      /* Recreate screen. */
 121
 122 static void tty3270_update(struct timer_list *);
 123 static void tty3270_resize_work(struct work_struct *work);
 124
 125 /*
 126  * Setup timeout for a device. On timeout trigger an update.
 127  */
 128 static void tty3270_set_timer(struct tty3270 *tp, int expires)
 129 {
 130         mod_timer(&tp->timer, jiffies + expires);
 131 }
 132
 133 /*
 134  * The input line are the two last lines of the screen.
 135  */
 136 static void
 137 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
 138 {
 139         struct string *line;
 140         unsigned int off;
 141
 142         line = tp->prompt;
 143         if (count != 0)
 144                 line->string[5] = TF_INMDT;
 145         else
 146                 line->string[5] = tp->inattr;
 147         if (count > tp->view.cols * 2 - 11)
 148                 count = tp->view.cols * 2 - 11;
 149         memcpy(line->string + 6, input, count);
 150         line->string[6 + count] = TO_IC;
 151         /* Clear to end of input line. */
 152         if (count < tp->view.cols * 2 - 11) {
 153                 line->string[7 + count] = TO_RA;
 154                 line->string[10 + count] = 0;
 155                 off = tp->view.cols * tp->view.rows - 9;
 156                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
 157                 line->len = 11 + count;
 158         } else
 159                 line->len = 7 + count;
 160         tp->update_flags |= TTY_UPDATE_INPUT;
 161 }
 162
 163 static void
 164 tty3270_create_prompt(struct tty3270 *tp)
 165 {
 166         static const unsigned char blueprint[] =
 167                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
 168                   /* empty input string */
 169                   TO_IC, TO_RA, 0, 0, 0 };
 170         struct string *line;
 171         unsigned int offset;
 172
 173         line = alloc_string(&tp->freemem,
 174                             sizeof(blueprint) + tp->view.cols * 2 - 9);
 175         tp->prompt = line;
 176         tp->inattr = TF_INPUT;
 177         /* Copy blueprint to status line */
 178         memcpy(line->string, blueprint, sizeof(blueprint));
 179         line->len = sizeof(blueprint);
 180         /* Set output offsets. */
 181         offset = tp->view.cols * (tp->view.rows - 2);
 182         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 183         offset = tp->view.cols * tp->view.rows - 9;
 184         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
 185
 186         /* Allocate input string for reading. */
 187         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
 188 }
 189
 190 /*
 191  * The status line is the last line of the screen. It shows the string
 192  * "Running"/"Holding" in the lower right corner of the screen.
 193  */
 194 static void
 195 tty3270_update_status(struct tty3270 * tp)
 196 {
 197         char *str;
 198
 199         str = (tp->nr_up != 0) ? "History" : "Running";
 200         memcpy(tp->status->string + 8, str, 7);
 201         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 202         tp->update_flags |= TTY_UPDATE_STATUS;
 203 }
 204
 205 static void
 206 tty3270_create_status(struct tty3270 * tp)
 207 {
 208         static const unsigned char blueprint[] =
 209                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
 210                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
 211                   TAC_RESET };
 212         struct string *line;
 213         unsigned int offset;
 214
 215         line = alloc_string(&tp->freemem,sizeof(blueprint));
 216         tp->status = line;
 217         /* Copy blueprint to status line */
 218         memcpy(line->string, blueprint, sizeof(blueprint));
 219         /* Set address to start of status string (= last 9 characters). */
 220         offset = tp->view.cols * tp->view.rows - 9;
 221         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
 222 }
 223
 224 /*
 225  * Set output offsets to 3270 datastream fragment of a tty string.
 226  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
 227  */
 228 static void
 229 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
 230 {
 231         unsigned char *cp;
 232
 233         raw3270_buffer_address(tp->view.dev, line->string + 1,
 234                                tp->view.cols * nr);
 235         cp = line->string + line->len - 4;
 236         if (*cp == TO_RA)
 237                 raw3270_buffer_address(tp->view.dev, cp + 1,
 238                                        tp->view.cols * (nr + 1));
 239 }
 240
 241 /*
 242  * Rebuild update list to print all lines.
 243  */
 244 static void
 245 tty3270_rebuild_update(struct tty3270 *tp)
 246 {
 247         struct string *s, *n;
 248         int line, nr_up;
 249
 250         /*
 251          * Throw away update list and create a new one,
 252          * containing all lines that will fit on the screen.
 253          */
 254         list_for_each_entry_safe(s, n, &tp->update, update)
 255                 list_del_init(&s->update);
 256         line = tp->view.rows - 3;
 257         nr_up = tp->nr_up;
 258         list_for_each_entry_reverse(s, &tp->lines, list) {
 259                 if (nr_up > 0) {
 260                         nr_up--;
 261                         continue;
 262                 }
 263                 tty3270_update_string(tp, s, line);
 264                 list_add(&s->update, &tp->update);
 265                 if (--line < 0)
 266                         break;
 267         }
 268         tp->update_flags |= TTY_UPDATE_LIST;
 269 }
 270
 271 /*
 272  * Alloc string for size bytes. If there is not enough room in
 273  * freemem, free strings until there is room.
 274  */
 275 static struct string *
 276 tty3270_alloc_string(struct tty3270 *tp, size_t size)
 277 {
 278         struct string *s, *n;
 279
 280         s = alloc_string(&tp->freemem, size);
 281         if (s)
 282                 return s;
 283         list_for_each_entry_safe(s, n, &tp->lines, list) {
 284                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
 285                 list_del(&s->list);
 286                 if (!list_empty(&s->update))
 287                         list_del(&s->update);
 288                 tp->nr_lines--;
 289                 if (free_string(&tp->freemem, s) >= size)
 290                         break;
 291         }
 292         s = alloc_string(&tp->freemem, size);
 293         BUG_ON(!s);
 294         if (tp->nr_up != 0 &&
 295             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
 296                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
 297                 tty3270_rebuild_update(tp);
 298                 tty3270_update_status(tp);
 299         }
 300         return s;
 301 }
 302
 303 /*
 304  * Add an empty line to the list.
 305  */
 306 static void
 307 tty3270_blank_line(struct tty3270 *tp)
 308 {
 309         static const unsigned char blueprint[] =
 310                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
 311                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
 312         struct string *s;
 313
 314         s = tty3270_alloc_string(tp, sizeof(blueprint));
 315         memcpy(s->string, blueprint, sizeof(blueprint));
 316         s->len = sizeof(blueprint);
 317         list_add_tail(&s->list, &tp->lines);
 318         tp->nr_lines++;
 319         if (tp->nr_up != 0)
 320                 tp->nr_up++;
 321 }
 322
 323 /*
 324  * Create a blank screen and remove all lines from the history.
 325  */
 326 static void
 327 tty3270_blank_screen(struct tty3270 *tp)
 328 {
 329         struct string *s, *n;
 330         int i;
 331
 332         for (i = 0; i < tp->view.rows - 2; i++)
 333                 tp->screen[i].len = 0;
 334         tp->nr_up = 0;
 335         list_for_each_entry_safe(s, n, &tp->lines, list) {
 336                 list_del(&s->list);
 337                 if (!list_empty(&s->update))
 338                         list_del(&s->update);
 339                 tp->nr_lines--;
 340                 free_string(&tp->freemem, s);
 341         }
 342 }
 343
 344 /*
 345  * Write request completion callback.
 346  */
 347 static void
 348 tty3270_write_callback(struct raw3270_request *rq, void *data)
 349 {
 350         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 351
 352         if (rq->rc != 0) {
 353                 /* Write wasn't successful. Refresh all. */
 354                 tp->update_flags = TTY_UPDATE_ALL;
 355                 tty3270_set_timer(tp, 1);
 356         }
 357         raw3270_request_reset(rq);
 358         xchg(&tp->write, rq);
 359 }
 360
 361 /*
 362  * Update 3270 display.
 363  */
 364 static void
 365 tty3270_update(struct timer_list *t)
 366 {
 367         struct tty3270 *tp = from_timer(tp, t, timer);
 368         static char invalid_sba[2] = { 0xff, 0xff };
 369         struct raw3270_request *wrq;
 370         unsigned long updated;
 371         struct string *s, *n;
 372         char *sba, *str;
 373         int rc, len;
 374
 375         wrq = xchg(&tp->write, 0);
 376         if (!wrq) {
 377                 tty3270_set_timer(tp, 1);
 378                 return;
 379         }
 380
 381         spin_lock(&tp->view.lock);
 382         updated = 0;
 383         if (tp->update_flags & TTY_UPDATE_ALL) {
 384                 tty3270_rebuild_update(tp);
 385                 tty3270_update_status(tp);
 386                 tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
 387                         TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
 388         }
 389         if (tp->update_flags & TTY_UPDATE_ERASE) {
 390                 /* Use erase write alternate to erase display. */
 391                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 392                 updated |= TTY_UPDATE_ERASE;
 393         } else
 394                 raw3270_request_set_cmd(wrq, TC_WRITE);
 395
 396         raw3270_request_add_data(wrq, &tp->wcc, 1);
 397         tp->wcc = TW_NONE;
 398
 399         /*
 400          * Update status line.
 401          */
 402         if (tp->update_flags & TTY_UPDATE_STATUS)
 403                 if (raw3270_request_add_data(wrq, tp->status->string,
 404                                              tp->status->len) == 0)
 405                         updated |= TTY_UPDATE_STATUS;
 406
 407         /*
 408          * Write input line.
 409          */
 410         if (tp->update_flags & TTY_UPDATE_INPUT)
 411                 if (raw3270_request_add_data(wrq, tp->prompt->string,
 412                                              tp->prompt->len) == 0)
 413                         updated |= TTY_UPDATE_INPUT;
 414
 415         sba = invalid_sba;
 416
 417         if (tp->update_flags & TTY_UPDATE_LIST) {
 418                 /* Write strings in the update list to the screen. */
 419                 list_for_each_entry_safe(s, n, &tp->update, update) {
 420                         str = s->string;
 421                         len = s->len;
 422                         /*
 423                          * Skip TO_SBA at the start of the string if the
 424                          * last output position matches the start address
 425                          * of this line.
 426                          */
 427                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
 428                                 str += 3, len -= 3;
 429                         if (raw3270_request_add_data(wrq, str, len) != 0)
 430                                 break;
 431                         list_del_init(&s->update);
 432                         if (s->string[s->len - 4] == TO_RA)
 433                                 sba = s->string + s->len - 3;
 434                         else
 435                                 sba = invalid_sba;
 436                 }
 437                 if (list_empty(&tp->update))
 438                         updated |= TTY_UPDATE_LIST;
 439         }
 440         wrq->callback = tty3270_write_callback;
 441         rc = raw3270_start(&tp->view, wrq);
 442         if (rc == 0) {
 443                 tp->update_flags &= ~updated;
 444                 if (tp->update_flags)
 445                         tty3270_set_timer(tp, 1);
 446         } else {
 447                 raw3270_request_reset(wrq);
 448                 xchg(&tp->write, wrq);
 449         }
 450         spin_unlock(&tp->view.lock);
 451 }
 452
 453 /*
 454  * Command recalling.
 455  */
 456 static void
 457 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
 458 {
 459         struct string *s;
 460
 461         tp->rcl_walk = NULL;
 462         if (len <= 0)
 463                 return;
 464         if (tp->rcl_nr >= tp->rcl_max) {
 465                 s = list_entry(tp->rcl_lines.next, struct string, list);
 466                 list_del(&s->list);
 467                 free_string(&tp->freemem, s);
 468                 tp->rcl_nr--;
 469         }
 470         s = tty3270_alloc_string(tp, len);
 471         memcpy(s->string, input, len);
 472         list_add_tail(&s->list, &tp->rcl_lines);
 473         tp->rcl_nr++;
 474 }
 475
 476 static void
 477 tty3270_rcl_backward(struct kbd_data *kbd)
 478 {
 479         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 480         struct string *s;
 481
 482         spin_lock_bh(&tp->view.lock);
 483         if (tp->inattr == TF_INPUT) {
 484                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
 485                         tp->rcl_walk = tp->rcl_walk->prev;
 486                 else if (!list_empty(&tp->rcl_lines))
 487                         tp->rcl_walk = tp->rcl_lines.prev;
 488                 s = tp->rcl_walk ?
 489                         list_entry(tp->rcl_walk, struct string, list) : NULL;
 490                 if (tp->rcl_walk) {
 491                         s = list_entry(tp->rcl_walk, struct string, list);
 492                         tty3270_update_prompt(tp, s->string, s->len);
 493                 } else
 494                         tty3270_update_prompt(tp, NULL, 0);
 495                 tty3270_set_timer(tp, 1);
 496         }
 497         spin_unlock_bh(&tp->view.lock);
 498 }
 499
 500 /*
 501  * Deactivate tty view.
 502  */
 503 static void
 504 tty3270_exit_tty(struct kbd_data *kbd)
 505 {
 506         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 507
 508         raw3270_deactivate_view(&tp->view);
 509 }
 510
 511 /*
 512  * Scroll forward in history.
 513  */
 514 static void
 515 tty3270_scroll_forward(struct kbd_data *kbd)
 516 {
 517         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 518         int nr_up;
 519
 520         spin_lock_bh(&tp->view.lock);
 521         nr_up = tp->nr_up - tp->view.rows + 2;
 522         if (nr_up < 0)
 523                 nr_up = 0;
 524         if (nr_up != tp->nr_up) {
 525                 tp->nr_up = nr_up;
 526                 tty3270_rebuild_update(tp);
 527                 tty3270_update_status(tp);
 528                 tty3270_set_timer(tp, 1);
 529         }
 530         spin_unlock_bh(&tp->view.lock);
 531 }
 532
 533 /*
 534  * Scroll backward in history.
 535  */
 536 static void
 537 tty3270_scroll_backward(struct kbd_data *kbd)
 538 {
 539         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
 540         int nr_up;
 541
 542         spin_lock_bh(&tp->view.lock);
 543         nr_up = tp->nr_up + tp->view.rows - 2;
 544         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
 545                 nr_up = tp->nr_lines - tp->view.rows + 2;
 546         if (nr_up != tp->nr_up) {
 547                 tp->nr_up = nr_up;
 548                 tty3270_rebuild_update(tp);
 549                 tty3270_update_status(tp);
 550                 tty3270_set_timer(tp, 1);
 551         }
 552         spin_unlock_bh(&tp->view.lock);
 553 }
 554
 555 /*
 556  * Pass input line to tty.
 557  */
 558 static void
 559 tty3270_read_tasklet(struct raw3270_request *rrq)
 560 {
 561         static char kreset_data = TW_KR;
 562         struct tty3270 *tp = container_of(rrq->view, struct tty3270, view);
 563         char *input;
 564         int len;
 565
 566         spin_lock_bh(&tp->view.lock);
 567         /*
 568          * Two AID keys are special: For 0x7d (enter) the input line
 569          * has to be emitted to the tty and for 0x6d the screen
 570          * needs to be redrawn.
 571          */
 572         input = NULL;
 573         len = 0;
 574         if (tp->input->string[0] == 0x7d) {
 575                 /* Enter: write input to tty. */
 576                 input = tp->input->string + 6;
 577                 len = tp->input->len - 6 - rrq->rescnt;
 578                 if (tp->inattr != TF_INPUTN)
 579                         tty3270_rcl_add(tp, input, len);
 580                 if (tp->nr_up > 0) {
 581                         tp->nr_up = 0;
 582                         tty3270_rebuild_update(tp);
 583                         tty3270_update_status(tp);
 584                 }
 585                 /* Clear input area. */
 586                 tty3270_update_prompt(tp, NULL, 0);
 587                 tty3270_set_timer(tp, 1);
 588         } else if (tp->input->string[0] == 0x6d) {
 589                 /* Display has been cleared. Redraw. */
 590                 tp->update_flags = TTY_UPDATE_ALL;
 591                 tty3270_set_timer(tp, 1);
 592         }
 593         spin_unlock_bh(&tp->view.lock);
 594
 595         /* Start keyboard reset command. */
 596         raw3270_request_reset(tp->kreset);
 597         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
 598         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
 599         raw3270_start(&tp->view, tp->kreset);
 600
 601         while (len-- > 0)
 602                 kbd_keycode(tp->kbd, *input++);
 603         /* Emit keycode for AID byte. */
 604         kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
 605
 606         raw3270_request_reset(rrq);
 607         xchg(&tp->read, rrq);
 608         raw3270_put_view(&tp->view);
 609 }
 610
 611 /*
 612  * Read request completion callback.
 613  */
 614 static void
 615 tty3270_read_callback(struct raw3270_request *rq, void *data)
 616 {
 617         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
 618         raw3270_get_view(rq->view);
 619         /* Schedule tasklet to pass input to tty. */
 620         tasklet_schedule(&tp->readlet);
 621 }
 622
 623 /*
 624  * Issue a read request. Call with device lock.
 625  */
 626 static void
 627 tty3270_issue_read(struct tty3270 *tp, int lock)
 628 {
 629         struct raw3270_request *rrq;
 630         int rc;
 631
 632         rrq = xchg(&tp->read, 0);
 633         if (!rrq)
 634                 /* Read already scheduled. */
 635                 return;
 636         rrq->callback = tty3270_read_callback;
 637         rrq->callback_data = tp;
 638         raw3270_request_set_cmd(rrq, TC_READMOD);
 639         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
 640         /* Issue the read modified request. */
 641         if (lock) {
 642                 rc = raw3270_start(&tp->view, rrq);
 643         } else
 644                 rc = raw3270_start_irq(&tp->view, rrq);
 645         if (rc) {
 646                 raw3270_request_reset(rrq);
 647                 xchg(&tp->read, rrq);
 648         }
 649 }
 650
 651 /*
 652  * Hang up the tty
 653  */
 654 static void
 655 tty3270_hangup_tasklet(struct tty3270 *tp)
 656 {
 657         tty_port_tty_hangup(&tp->port, true);
 658         raw3270_put_view(&tp->view);
 659 }
 660
 661 /*
 662  * Switch to the tty view.
 663  */
 664 static int
 665 tty3270_activate(struct raw3270_view *view)
 666 {
 667         struct tty3270 *tp = container_of(view, struct tty3270, view);
 668
 669         tp->update_flags = TTY_UPDATE_ALL;
 670         tty3270_set_timer(tp, 1);
 671         return 0;
 672 }
 673
 674 static void
 675 tty3270_deactivate(struct raw3270_view *view)
 676 {
 677         struct tty3270 *tp = container_of(view, struct tty3270, view);
 678
 679         del_timer(&tp->timer);
 680 }
 681
 682 static void
 683 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
 684 {
 685         /* Handle ATTN. Schedule tasklet to read aid. */
 686         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 687                 if (!tp->throttle)
 688                         tty3270_issue_read(tp, 0);
 689                 else
 690                         tp->attn = 1;
 691         }
 692
 693         if (rq) {
 694                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 695                         rq->rc = -EIO;
 696                         raw3270_get_view(&tp->view);
 697                         tasklet_schedule(&tp->hanglet);
 698                 } else {
 699                         /* Normal end. Copy residual count. */
 700                         rq->rescnt = irb->scsw.cmd.count;
 701                 }
 702         } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 703                 /* Interrupt without an outstanding request -> update all */
 704                 tp->update_flags = TTY_UPDATE_ALL;
 705                 tty3270_set_timer(tp, 1);
 706         }
 707 }
 708
 709 /*
 710  * Allocate tty3270 structure.
 711  */
 712 static struct tty3270 *
 713 tty3270_alloc_view(void)
 714 {
 715         struct tty3270 *tp;
 716         int pages;
 717
 718         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
 719         if (!tp)
 720                 goto out_err;
 721         tp->freemem_pages =
 722                 kmalloc_array(TTY3270_STRING_PAGES, sizeof(void *),
 723                               GFP_KERNEL);
 724         if (!tp->freemem_pages)
 725                 goto out_tp;
 726         INIT_LIST_HEAD(&tp->freemem);
 727         INIT_LIST_HEAD(&tp->lines);
 728         INIT_LIST_HEAD(&tp->update);
 729         INIT_LIST_HEAD(&tp->rcl_lines);
 730         tp->rcl_max = 20;
 731
 732         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 733                 tp->freemem_pages[pages] = (void *)
 734                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 735                 if (!tp->freemem_pages[pages])
 736                         goto out_pages;
 737                 add_string_memory(&tp->freemem,
 738                                   tp->freemem_pages[pages], PAGE_SIZE);
 739         }
 740         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 741         if (IS_ERR(tp->write))
 742                 goto out_pages;
 743         tp->read = raw3270_request_alloc(0);
 744         if (IS_ERR(tp->read))
 745                 goto out_write;
 746         tp->kreset = raw3270_request_alloc(1);
 747         if (IS_ERR(tp->kreset))
 748                 goto out_read;
 749         tp->kbd = kbd_alloc();
 750         if (!tp->kbd)
 751                 goto out_reset;
 752
 753         tty_port_init(&tp->port);
 754         timer_setup(&tp->timer, tty3270_update, 0);
 755         tasklet_init(&tp->readlet,
 756                      (void (*)(unsigned long)) tty3270_read_tasklet,
 757                      (unsigned long) tp->read);
 758         tasklet_init(&tp->hanglet,
 759                      (void (*)(unsigned long)) tty3270_hangup_tasklet,
 760                      (unsigned long) tp);
 761         INIT_WORK(&tp->resize_work, tty3270_resize_work);
 762
 763         return tp;
 764
 765 out_reset:
 766         raw3270_request_free(tp->kreset);
 767 out_read:
 768         raw3270_request_free(tp->read);
 769 out_write:
 770         raw3270_request_free(tp->write);
 771 out_pages:
 772         while (pages--)
 773                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 774         kfree(tp->freemem_pages);
 775         tty_port_destroy(&tp->port);
 776 out_tp:
 777         kfree(tp);
 778 out_err:
 779         return ERR_PTR(-ENOMEM);
 780 }
 781
 782 /*
 783  * Free tty3270 structure.
 784  */
 785 static void
 786 tty3270_free_view(struct tty3270 *tp)
 787 {
 788         int pages;
 789
 790         kbd_free(tp->kbd);
 791         raw3270_request_free(tp->kreset);
 792         raw3270_request_free(tp->read);
 793         raw3270_request_free(tp->write);
 794         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 795                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 796         kfree(tp->freemem_pages);
 797         tty_port_destroy(&tp->port);
 798         kfree(tp);
 799 }
 800
 801 /*
 802  * Allocate tty3270 screen.
 803  */
 804 static struct tty3270_line *
 805 tty3270_alloc_screen(unsigned int rows, unsigned int cols)
 806 {
 807         struct tty3270_line *screen;
 808         unsigned long size;
 809         int lines;
 810
 811         size = sizeof(struct tty3270_line) * (rows - 2);
 812         screen = kzalloc(size, GFP_KERNEL);
 813         if (!screen)
 814                 goto out_err;
 815         for (lines = 0; lines < rows - 2; lines++) {
 816                 size = sizeof(struct tty3270_cell) * cols;
 817                 screen[lines].cells = kzalloc(size, GFP_KERNEL);
 818                 if (!screen[lines].cells)
 819                         goto out_screen;
 820         }
 821         return screen;
 822 out_screen:
 823         while (lines--)
 824                 kfree(screen[lines].cells);
 825         kfree(screen);
 826 out_err:
 827         return ERR_PTR(-ENOMEM);
 828 }
 829
 830 /*
 831  * Free tty3270 screen.
 832  */
 833 static void
 834 tty3270_free_screen(struct tty3270_line *screen, unsigned int rows)
 835 {
 836         int lines;
 837
 838         for (lines = 0; lines < rows - 2; lines++)
 839                 kfree(screen[lines].cells);
 840         kfree(screen);
 841 }
 842
 843 /*
 844  * Resize tty3270 screen
 845  */
 846 static void tty3270_resize_work(struct work_struct *work)
 847 {
 848         struct tty3270 *tp = container_of(work, struct tty3270, resize_work);
 849         struct tty3270_line *screen, *oscreen;
 850         struct tty_struct *tty;
 851         unsigned int orows;
 852         struct winsize ws;
 853
 854         screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
 855         if (IS_ERR(screen))
 856                 return;
 857         /* Switch to new output size */
 858         spin_lock_bh(&tp->view.lock);
 859         tty3270_blank_screen(tp);
 860         oscreen = tp->screen;
 861         orows = tp->view.rows;
 862         tp->view.model = tp->n_model;
 863         tp->view.rows = tp->n_rows;
 864         tp->view.cols = tp->n_cols;
 865         tp->screen = screen;
 866         free_string(&tp->freemem, tp->prompt);
 867         free_string(&tp->freemem, tp->status);
 868         tty3270_create_prompt(tp);
 869         tty3270_create_status(tp);
 870         while (tp->nr_lines < tp->view.rows - 2)
 871                 tty3270_blank_line(tp);
 872         tp->update_flags = TTY_UPDATE_ALL;
 873         spin_unlock_bh(&tp->view.lock);
 874         tty3270_free_screen(oscreen, orows);
 875         tty3270_set_timer(tp, 1);
 876         /* Informat tty layer about new size */
 877         tty = tty_port_tty_get(&tp->port);
 878         if (!tty)
 879                 return;
 880         ws.ws_row = tp->view.rows - 2;
 881         ws.ws_col = tp->view.cols;
 882         tty_do_resize(tty, &ws);
 883         tty_kref_put(tty);
 884 }
 885
 886 static void
 887 tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
 888 {
 889         struct tty3270 *tp = container_of(view, struct tty3270, view);
 890
 891         if (tp->n_model == model && tp->n_rows == rows && tp->n_cols == cols)
 892                 return;
 893         tp->n_model = model;
 894         tp->n_rows = rows;
 895         tp->n_cols = cols;
 896         schedule_work(&tp->resize_work);
 897 }
 898
 899 /*
 900  * Unlink tty3270 data structure from tty.
 901  */
 902 static void
 903 tty3270_release(struct raw3270_view *view)
 904 {
 905         struct tty3270 *tp = container_of(view, struct tty3270, view);
 906         struct tty_struct *tty = tty_port_tty_get(&tp->port);
 907
 908         if (tty) {
 909                 tty->driver_data = NULL;
 910                 tty_port_tty_set(&tp->port, NULL);
 911                 tty_hangup(tty);
 912                 raw3270_put_view(&tp->view);
 913                 tty_kref_put(tty);
 914         }
 915 }
 916
 917 /*
 918  * Free tty3270 data structure
 919  */
 920 static void
 921 tty3270_free(struct raw3270_view *view)
 922 {
 923         struct tty3270 *tp = container_of(view, struct tty3270, view);
 924
 925         del_timer_sync(&tp->timer);
 926         tty3270_free_screen(tp->screen, tp->view.rows);
 927         tty3270_free_view(tp);
 928 }
 929
 930 /*
 931  * Delayed freeing of tty3270 views.
 932  */
 933 static void
 934 tty3270_del_views(void)
 935 {
 936         int i;
 937
 938         for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
 939                 struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
 940                 if (!IS_ERR(view))
 941                         raw3270_del_view(view);
 942         }
 943 }
 944
 945 static struct raw3270_fn tty3270_fn = {
 946         .activate = tty3270_activate,
 947         .deactivate = tty3270_deactivate,
 948         .intv = (void *) tty3270_irq,
 949         .release = tty3270_release,
 950         .free = tty3270_free,
 951         .resize = tty3270_resize
 952 };
 953
 954 /*
 955  * This routine is called whenever a 3270 tty is opened first time.
 956  */
 957 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 958 {
 959         struct raw3270_view *view;
 960         struct tty3270 *tp;
 961         int i, rc;
 962
 963         /* Check if the tty3270 is already there. */
 964         view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
 965         if (!IS_ERR(view)) {
 966                 tp = container_of(view, struct tty3270, view);
 967                 tty->driver_data = tp;
 968                 tty->winsize.ws_row = tp->view.rows - 2;
 969                 tty->winsize.ws_col = tp->view.cols;
 970                 tp->port.low_latency = 0;
 971                 tp->inattr = TF_INPUT;
 972                 goto port_install;
 973         }
 974         if (tty3270_max_index < tty->index + 1)
 975                 tty3270_max_index = tty->index + 1;
 976
 977         /* Allocate tty3270 structure on first open. */
 978         tp = tty3270_alloc_view();
 979         if (IS_ERR(tp))
 980                 return PTR_ERR(tp);
 981
 982         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 983                               tty->index + RAW3270_FIRSTMINOR);
 984         if (rc) {
 985                 tty3270_free_view(tp);
 986                 return rc;
 987         }
 988
 989         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 990         if (IS_ERR(tp->screen)) {
 991                 rc = PTR_ERR(tp->screen);
 992                 raw3270_put_view(&tp->view);
 993                 raw3270_del_view(&tp->view);
 994                 tty3270_free_view(tp);
 995                 return rc;
 996         }
 997
 998         tp->port.low_latency = 0;
 999         tty->winsize.ws_row = tp->view.rows - 2;
1000         tty->winsize.ws_col = tp->view.cols;
1001
1002         tty3270_create_prompt(tp);
1003         tty3270_create_status(tp);
1004         tty3270_update_status(tp);
1005
1006         /* Create blank line for every line in the tty output area. */
1007         for (i = 0; i < tp->view.rows - 2; i++)
1008                 tty3270_blank_line(tp);
1009
1010         tp->kbd->port = &tp->port;
1011         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
1012         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
1013         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
1014         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
1015         kbd_ascebc(tp->kbd, tp->view.ascebc);
1016
1017         raw3270_activate_view(&tp->view);
1018
1019 port_install:
1020         rc = tty_port_install(&tp->port, driver, tty);
1021         if (rc) {
1022                 raw3270_put_view(&tp->view);
1023                 return rc;
1024         }
1025
1026         tty->driver_data = tp;
1027
1028         return 0;
1029 }
1030
1031 /*
1032  * This routine is called whenever a 3270 tty is opened.
1033  */
1034 static int
1035 tty3270_open(struct tty_struct *tty, struct file *filp)
1036 {
1037         struct tty3270 *tp = tty->driver_data;
1038         struct tty_port *port = &tp->port;
1039
1040         port->count++;
1041         tty_port_tty_set(port, tty);
1042         return 0;
1043 }
1044
1045 /*
1046  * This routine is called when the 3270 tty is closed. We wait
1047  * for the remaining request to be completed. Then we clean up.
1048  */
1049 static void
1050 tty3270_close(struct tty_struct *tty, struct file * filp)
1051 {
1052         struct tty3270 *tp = tty->driver_data;
1053
1054         if (tty->count > 1)
1055                 return;
1056         if (tp)
1057                 tty_port_tty_set(&tp->port, NULL);
1058 }
1059
1060 static void tty3270_cleanup(struct tty_struct *tty)
1061 {
1062         struct tty3270 *tp = tty->driver_data;
1063
1064         if (tp) {
1065                 tty->driver_data = NULL;
1066                 raw3270_put_view(&tp->view);
1067         }
1068 }
1069
1070 /*
1071  * We always have room.
1072  */
1073 static int
1074 tty3270_write_room(struct tty_struct *tty)
1075 {
1076         return INT_MAX;
1077 }
1078
1079 /*
1080  * Insert character into the screen at the current position with the
1081  * current color and highlight. This function does NOT do cursor movement.
1082  */
1083 static void tty3270_put_character(struct tty3270 *tp, char ch)
1084 {
1085         struct tty3270_line *line;
1086         struct tty3270_cell *cell;
1087
1088         line = tp->screen + tp->cy;
1089         if (line->len <= tp->cx) {
1090                 while (line->len < tp->cx) {
1091                         cell = line->cells + line->len;
1092                         cell->character = tp->view.ascebc[' '];
1093                         cell->highlight = tp->highlight;
1094                         cell->f_color = tp->f_color;
1095                         line->len++;
1096                 }
1097                 line->len++;
1098         }
1099         cell = line->cells + tp->cx;
1100         cell->character = tp->view.ascebc[(unsigned int) ch];
1101         cell->highlight = tp->highlight;
1102         cell->f_color = tp->f_color;
1103 }
1104
1105 /*
1106  * Convert a tty3270_line to a 3270 data fragment usable for output.
1107  */
1108 static void
1109 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1110 {
1111         struct tty3270_line *line;
1112         struct tty3270_cell *cell;
1113         struct string *s, *n;
1114         unsigned char highlight;
1115         unsigned char f_color;
1116         char *cp;
1117         int flen, i;
1118
1119         /* Determine how long the fragment will be. */
1120         flen = 3;               /* Prefix (TO_SBA). */
1121         line = tp->screen + line_nr;
1122         flen += line->len;
1123         highlight = TAX_RESET;
1124         f_color = TAC_RESET;
1125         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1126                 if (cell->highlight != highlight) {
1127                         flen += 3;      /* TO_SA to switch highlight. */
1128                         highlight = cell->highlight;
1129                 }
1130                 if (cell->f_color != f_color) {
1131                         flen += 3;      /* TO_SA to switch color. */
1132                         f_color = cell->f_color;
1133                 }
1134         }
1135         if (highlight != TAX_RESET)
1136                 flen += 3;      /* TO_SA to reset hightlight. */
1137         if (f_color != TAC_RESET)
1138                 flen += 3;      /* TO_SA to reset color. */
1139         if (line->len < tp->view.cols)
1140                 flen += 4;      /* Postfix (TO_RA). */
1141
1142         /* Find the line in the list. */
1143         i = tp->view.rows - 2 - line_nr;
1144         list_for_each_entry_reverse(s, &tp->lines, list)
1145                 if (--i <= 0)
1146                         break;
1147         /*
1148          * Check if the line needs to get reallocated.
1149          */
1150         if (s->len != flen) {
1151                 /* Reallocate string. */
1152                 n = tty3270_alloc_string(tp, flen);
1153                 list_add(&n->list, &s->list);
1154                 list_del_init(&s->list);
1155                 if (!list_empty(&s->update))
1156                         list_del_init(&s->update);
1157                 free_string(&tp->freemem, s);
1158                 s = n;
1159         }
1160
1161         /* Write 3270 data fragment. */
1162         cp = s->string;
1163         *cp++ = TO_SBA;
1164         *cp++ = 0;
1165         *cp++ = 0;
1166
1167         highlight = TAX_RESET;
1168         f_color = TAC_RESET;
1169         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1170                 if (cell->highlight != highlight) {
1171                         *cp++ = TO_SA;
1172                         *cp++ = TAT_EXTHI;
1173                         *cp++ = cell->highlight;
1174                         highlight = cell->highlight;
1175                 }
1176                 if (cell->f_color != f_color) {
1177                         *cp++ = TO_SA;
1178                         *cp++ = TAT_COLOR;
1179                         *cp++ = cell->f_color;
1180                         f_color = cell->f_color;
1181                 }
1182                 *cp++ = cell->character;
1183         }
1184         if (highlight != TAX_RESET) {
1185                 *cp++ = TO_SA;
1186                 *cp++ = TAT_EXTHI;
1187                 *cp++ = TAX_RESET;
1188         }
1189         if (f_color != TAC_RESET) {
1190                 *cp++ = TO_SA;
1191                 *cp++ = TAT_COLOR;
1192                 *cp++ = TAC_RESET;
1193         }
1194         if (line->len < tp->view.cols) {
1195                 *cp++ = TO_RA;
1196                 *cp++ = 0;
1197                 *cp++ = 0;
1198                 *cp++ = 0;
1199         }
1200
1201         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1202                 /* Line is currently visible on screen. */
1203                 tty3270_update_string(tp, s, line_nr);
1204                 /* Add line to update list. */
1205                 if (list_empty(&s->update)) {
1206                         list_add_tail(&s->update, &tp->update);
1207                         tp->update_flags |= TTY_UPDATE_LIST;
1208                 }
1209         }
1210 }
1211
1212 /*
1213  * Do carriage return.
1214  */
1215 static void
1216 tty3270_cr(struct tty3270 *tp)
1217 {
1218         tp->cx = 0;
1219 }
1220
1221 /*
1222  * Do line feed.
1223  */
1224 static void
1225 tty3270_lf(struct tty3270 *tp)
1226 {
1227         struct tty3270_line temp;
1228         int i;
1229
1230         tty3270_convert_line(tp, tp->cy);
1231         if (tp->cy < tp->view.rows - 3) {
1232                 tp->cy++;
1233                 return;
1234         }
1235         /* Last line just filled up. Add new, blank line. */
1236         tty3270_blank_line(tp);
1237         temp = tp->screen[0];
1238         temp.len = 0;
1239         for (i = 0; i < tp->view.rows - 3; i++)
1240                 tp->screen[i] = tp->screen[i+1];
1241         tp->screen[tp->view.rows - 3] = temp;
1242         tty3270_rebuild_update(tp);
1243 }
1244
1245 static void
1246 tty3270_ri(struct tty3270 *tp)
1247 {
1248         if (tp->cy > 0) {
1249             tty3270_convert_line(tp, tp->cy);
1250             tp->cy--;
1251         }
1252 }
1253
1254 /*
1255  * Insert characters at current position.
1256  */
1257 static void
1258 tty3270_insert_characters(struct tty3270 *tp, int n)
1259 {
1260         struct tty3270_line *line;
1261         int k;
1262
1263         line = tp->screen + tp->cy;
1264         while (line->len < tp->cx) {
1265                 line->cells[line->len].character = tp->view.ascebc[' '];
1266                 line->cells[line->len].highlight = TAX_RESET;
1267                 line->cells[line->len].f_color = TAC_RESET;
1268                 line->len++;
1269         }
1270         if (n > tp->view.cols - tp->cx)
1271                 n = tp->view.cols - tp->cx;
1272         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1273         while (k--)
1274                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1275         line->len += n;
1276         if (line->len > tp->view.cols)
1277                 line->len = tp->view.cols;
1278         while (n-- > 0) {
1279                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1280                 line->cells[tp->cx + n].highlight = tp->highlight;
1281                 line->cells[tp->cx + n].f_color = tp->f_color;
1282         }
1283 }
1284
1285 /*
1286  * Delete characters at current position.
1287  */
1288 static void
1289 tty3270_delete_characters(struct tty3270 *tp, int n)
1290 {
1291         struct tty3270_line *line;
1292         int i;
1293
1294         line = tp->screen + tp->cy;
1295         if (line->len <= tp->cx)
1296                 return;
1297         if (line->len - tp->cx <= n) {
1298                 line->len = tp->cx;
1299                 return;
1300         }
1301         for (i = tp->cx; i + n < line->len; i++)
1302                 line->cells[i] = line->cells[i + n];
1303         line->len -= n;
1304 }
1305
1306 /*
1307  * Erase characters at current position.
1308  */
1309 static void
1310 tty3270_erase_characters(struct tty3270 *tp, int n)
1311 {
1312         struct tty3270_line *line;
1313         struct tty3270_cell *cell;
1314
1315         line = tp->screen + tp->cy;
1316         while (line->len > tp->cx && n-- > 0) {
1317                 cell = line->cells + tp->cx++;
1318                 cell->character = ' ';
1319                 cell->highlight = TAX_RESET;
1320                 cell->f_color = TAC_RESET;
1321         }
1322         tp->cx += n;
1323         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1324 }
1325
1326 /*
1327  * Erase line, 3 different cases:
1328  *  Esc [ 0 K   Erase from current position to end of line inclusive
1329  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1330  *  Esc [ 2 K   Erase entire line (without moving cursor)
1331  */
1332 static void
1333 tty3270_erase_line(struct tty3270 *tp, int mode)
1334 {
1335         struct tty3270_line *line;
1336         struct tty3270_cell *cell;
1337         int i;
1338
1339         line = tp->screen + tp->cy;
1340         if (mode == 0)
1341                 line->len = tp->cx;
1342         else if (mode == 1) {
1343                 for (i = 0; i < tp->cx; i++) {
1344                         cell = line->cells + i;
1345                         cell->character = ' ';
1346                         cell->highlight = TAX_RESET;
1347                         cell->f_color = TAC_RESET;
1348                 }
1349                 if (line->len <= tp->cx)
1350                         line->len = tp->cx + 1;
1351         } else if (mode == 2)
1352                 line->len = 0;
1353         tty3270_convert_line(tp, tp->cy);
1354 }
1355
1356 /*
1357  * Erase display, 3 different cases:
1358  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1359  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1360  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1361  */
1362 static void
1363 tty3270_erase_display(struct tty3270 *tp, int mode)
1364 {
1365         int i;
1366
1367         if (mode == 0) {
1368                 tty3270_erase_line(tp, 0);
1369                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1370                         tp->screen[i].len = 0;
1371                         tty3270_convert_line(tp, i);
1372                 }
1373         } else if (mode == 1) {
1374                 for (i = 0; i < tp->cy; i++) {
1375                         tp->screen[i].len = 0;
1376                         tty3270_convert_line(tp, i);
1377                 }
1378                 tty3270_erase_line(tp, 1);
1379         } else if (mode == 2) {
1380                 for (i = 0; i < tp->view.rows - 2; i++) {
1381                         tp->screen[i].len = 0;
1382                         tty3270_convert_line(tp, i);
1383                 }
1384         }
1385         tty3270_rebuild_update(tp);
1386 }
1387
1388 /*
1389  * Set attributes found in an escape sequence.
1390  *  Esc [ <attr> ; <attr> ; ... m
1391  */
1392 static void
1393 tty3270_set_attributes(struct tty3270 *tp)
1394 {
1395         static unsigned char f_colors[] = {
1396                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1397                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1398         };
1399         int i, attr;
1400
1401         for (i = 0; i <= tp->esc_npar; i++) {
1402                 attr = tp->esc_par[i];
1403                 switch (attr) {
1404                 case 0:         /* Reset */
1405                         tp->highlight = TAX_RESET;
1406                         tp->f_color = TAC_RESET;
1407                         break;
1408                 /* Highlight. */
1409                 case 4:         /* Start underlining. */
1410                         tp->highlight = TAX_UNDER;
1411                         break;
1412                 case 5:         /* Start blink. */
1413                         tp->highlight = TAX_BLINK;
1414                         break;
1415                 case 7:         /* Start reverse. */
1416                         tp->highlight = TAX_REVER;
1417                         break;
1418                 case 24:        /* End underlining */
1419                         if (tp->highlight == TAX_UNDER)
1420                                 tp->highlight = TAX_RESET;
1421                         break;
1422                 case 25:        /* End blink. */
1423                         if (tp->highlight == TAX_BLINK)
1424                                 tp->highlight = TAX_RESET;
1425                         break;
1426                 case 27:        /* End reverse. */
1427                         if (tp->highlight == TAX_REVER)
1428                                 tp->highlight = TAX_RESET;
1429                         break;
1430                 /* Foreground color. */
1431                 case 30:        /* Black */
1432                 case 31:        /* Red */
1433                 case 32:        /* Green */
1434                 case 33:        /* Yellow */
1435                 case 34:        /* Blue */
1436                 case 35:        /* Magenta */
1437                 case 36:        /* Cyan */
1438                 case 37:        /* White */
1439                 case 39:        /* Black */
1440                         tp->f_color = f_colors[attr - 30];
1441                         break;
1442                 }
1443         }
1444 }
1445
1446 static inline int
1447 tty3270_getpar(struct tty3270 *tp, int ix)
1448 {
1449         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1450 }
1451
1452 static void
1453 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1454 {
1455         int max_cx = max(0, cx);
1456         int max_cy = max(0, cy);
1457
1458         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1459         cy = min_t(int, tp->view.rows - 3, max_cy);
1460         if (cy != tp->cy) {
1461                 tty3270_convert_line(tp, tp->cy);
1462                 tp->cy = cy;
1463         }
1464 }
1465
1466 /*
1467  * Process escape sequences. Known sequences:
1468  *  Esc 7                       Save Cursor Position
1469  *  Esc 8                       Restore Cursor Position
1470  *  Esc [ Pn ; Pn ; .. m        Set attributes
1471  *  Esc [ Pn ; Pn H             Cursor Position
1472  *  Esc [ Pn ; Pn f             Cursor Position
1473  *  Esc [ Pn A                  Cursor Up
1474  *  Esc [ Pn B                  Cursor Down
1475  *  Esc [ Pn C                  Cursor Forward
1476  *  Esc [ Pn D                  Cursor Backward
1477  *  Esc [ Pn G                  Cursor Horizontal Absolute
1478  *  Esc [ Pn X                  Erase Characters
1479  *  Esc [ Ps J                  Erase in Display
1480  *  Esc [ Ps K                  Erase in Line
1481  * // FIXME: add all the new ones.
1482  *
1483  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1484  *  Ps is a selective parameter.
1485  */
1486 static void
1487 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1488 {
1489         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1490
1491         if (tp->esc_state == ESnormal) {
1492                 if (ch == 0x1b)
1493                         /* Starting new escape sequence. */
1494                         tp->esc_state = ESesc;
1495                 return;
1496         }
1497         if (tp->esc_state == ESesc) {
1498                 tp->esc_state = ESnormal;
1499                 switch (ch) {
1500                 case '[':
1501                         tp->esc_state = ESsquare;
1502                         break;
1503                 case 'E':
1504                         tty3270_cr(tp);
1505                         tty3270_lf(tp);
1506                         break;
1507                 case 'M':
1508                         tty3270_ri(tp);
1509                         break;
1510                 case 'D':
1511                         tty3270_lf(tp);
1512                         break;
1513                 case 'Z':               /* Respond ID. */
1514                         kbd_puts_queue(&tp->port, "\033[?6c");
1515                         break;
1516                 case '7':               /* Save cursor position. */
1517                         tp->saved_cx = tp->cx;
1518                         tp->saved_cy = tp->cy;
1519                         tp->saved_highlight = tp->highlight;
1520                         tp->saved_f_color = tp->f_color;
1521                         break;
1522                 case '8':               /* Restore cursor position. */
1523                         tty3270_convert_line(tp, tp->cy);
1524                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1525                         tp->highlight = tp->saved_highlight;
1526                         tp->f_color = tp->saved_f_color;
1527                         break;
1528                 case 'c':               /* Reset terminal. */
1529                         tp->cx = tp->saved_cx = 0;
1530                         tp->cy = tp->saved_cy = 0;
1531                         tp->highlight = tp->saved_highlight = TAX_RESET;
1532                         tp->f_color = tp->saved_f_color = TAC_RESET;
1533                         tty3270_erase_display(tp, 2);
1534                         break;
1535                 }
1536                 return;
1537         }
1538         if (tp->esc_state == ESsquare) {
1539                 tp->esc_state = ESgetpars;
1540                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1541                 tp->esc_npar = 0;
1542                 tp->esc_ques = (ch == '?');
1543                 if (tp->esc_ques)
1544                         return;
1545         }
1546         if (tp->esc_state == ESgetpars) {
1547                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1548                         tp->esc_npar++;
1549                         return;
1550                 }
1551                 if (ch >= '0' && ch <= '9') {
1552                         tp->esc_par[tp->esc_npar] *= 10;
1553                         tp->esc_par[tp->esc_npar] += ch - '0';
1554                         return;
1555                 }
1556         }
1557         tp->esc_state = ESnormal;
1558         if (ch == 'n' && !tp->esc_ques) {
1559                 if (tp->esc_par[0] == 5)                /* Status report. */
1560                         kbd_puts_queue(&tp->port, "\033[0n");
1561                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1562                         char buf[40];
1563                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1564                         kbd_puts_queue(&tp->port, buf);
1565                 }
1566                 return;
1567         }
1568         if (tp->esc_ques)
1569                 return;
1570         switch (ch) {
1571         case 'm':
1572                 tty3270_set_attributes(tp);
1573                 break;
1574         case 'H':       /* Set cursor position. */
1575         case 'f':
1576                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1577                                 tty3270_getpar(tp, 0) - 1);
1578                 break;
1579         case 'd':       /* Set y position. */
1580                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1581                 break;
1582         case 'A':       /* Cursor up. */
1583         case 'F':
1584                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1585                 break;
1586         case 'B':       /* Cursor down. */
1587         case 'e':
1588         case 'E':
1589                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1590                 break;
1591         case 'C':       /* Cursor forward. */
1592         case 'a':
1593                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1594                 break;
1595         case 'D':       /* Cursor backward. */
1596                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1597                 break;
1598         case 'G':       /* Set x position. */
1599         case '`':
1600                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1601                 break;
1602         case 'X':       /* Erase Characters. */
1603                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1604                 break;
1605         case 'J':       /* Erase display. */
1606                 tty3270_erase_display(tp, tp->esc_par[0]);
1607                 break;
1608         case 'K':       /* Erase line. */
1609                 tty3270_erase_line(tp, tp->esc_par[0]);
1610                 break;
1611         case 'P':       /* Delete characters. */
1612                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1613                 break;
1614         case '@':       /* Insert characters. */
1615                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1616                 break;
1617         case 's':       /* Save cursor position. */
1618                 tp->saved_cx = tp->cx;
1619                 tp->saved_cy = tp->cy;
1620                 tp->saved_highlight = tp->highlight;
1621                 tp->saved_f_color = tp->f_color;
1622                 break;
1623         case 'u':       /* Restore cursor position. */
1624                 tty3270_convert_line(tp, tp->cy);
1625                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1626                 tp->highlight = tp->saved_highlight;
1627                 tp->f_color = tp->saved_f_color;
1628                 break;
1629         }
1630 }
1631
1632 /*
1633  * String write routine for 3270 ttys
1634  */
1635 static void
1636 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1637                 const unsigned char *buf, int count)
1638 {
1639         int i_msg, i;
1640
1641         spin_lock_bh(&tp->view.lock);
1642         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1643                 if (tp->esc_state != 0) {
1644                         /* Continue escape sequence. */
1645                         tty3270_escape_sequence(tp, buf[i_msg]);
1646                         continue;
1647                 }
1648
1649                 switch (buf[i_msg]) {
1650                 case 0x07:              /* '\a' -- Alarm */
1651                         tp->wcc |= TW_PLUSALARM;
1652                         break;
1653                 case 0x08:              /* Backspace. */
1654                         if (tp->cx > 0) {
1655                                 tp->cx--;
1656                                 tty3270_put_character(tp, ' ');
1657                         }
1658                         break;
1659                 case 0x09:              /* '\t' -- Tabulate */
1660                         for (i = tp->cx % 8; i < 8; i++) {
1661                                 if (tp->cx >= tp->view.cols) {
1662                                         tty3270_cr(tp);
1663                                         tty3270_lf(tp);
1664                                         break;
1665                                 }
1666                                 tty3270_put_character(tp, ' ');
1667                                 tp->cx++;
1668                         }
1669                         break;
1670                 case 0x0a:              /* '\n' -- New Line */
1671                         tty3270_cr(tp);
1672                         tty3270_lf(tp);
1673                         break;
1674                 case 0x0c:              /* '\f' -- Form Feed */
1675                         tty3270_erase_display(tp, 2);
1676                         tp->cx = tp->cy = 0;
1677                         break;
1678                 case 0x0d:              /* '\r' -- Carriage Return */
1679                         tp->cx = 0;
1680                         break;
1681                 case 0x0f:              /* SuSE "exit alternate mode" */
1682                         break;
1683                 case 0x1b:              /* Start escape sequence. */
1684                         tty3270_escape_sequence(tp, buf[i_msg]);
1685                         break;
1686                 default:                /* Insert normal character. */
1687                         if (tp->cx >= tp->view.cols) {
1688                                 tty3270_cr(tp);
1689                                 tty3270_lf(tp);
1690                         }
1691                         tty3270_put_character(tp, buf[i_msg]);
1692                         tp->cx++;
1693                         break;
1694                 }
1695         }
1696         /* Convert current line to 3270 data fragment. */
1697         tty3270_convert_line(tp, tp->cy);
1698
1699         /* Setup timer to update display after 1/10 second */
1700         if (!timer_pending(&tp->timer))
1701                 tty3270_set_timer(tp, HZ/10);
1702
1703         spin_unlock_bh(&tp->view.lock);
1704 }
1705
1706 /*
1707  * String write routine for 3270 ttys
1708  */
1709 static int
1710 tty3270_write(struct tty_struct * tty,
1711               const unsigned char *buf, int count)
1712 {
1713         struct tty3270 *tp;
1714
1715         tp = tty->driver_data;
1716         if (!tp)
1717                 return 0;
1718         if (tp->char_count > 0) {
1719                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1720                 tp->char_count = 0;
1721         }
1722         tty3270_do_write(tp, tty, buf, count);
1723         return count;
1724 }
1725
1726 /*
1727  * Put single characters to the ttys character buffer
1728  */
1729 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1730 {
1731         struct tty3270 *tp;
1732
1733         tp = tty->driver_data;
1734         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1735                 return 0;
1736         tp->char_buf[tp->char_count++] = ch;
1737         return 1;
1738 }
1739
1740 /*
1741  * Flush all characters from the ttys characeter buffer put there
1742  * by tty3270_put_char.
1743  */
1744 static void
1745 tty3270_flush_chars(struct tty_struct *tty)
1746 {
1747         struct tty3270 *tp;
1748
1749         tp = tty->driver_data;
1750         if (!tp)
1751                 return;
1752         if (tp->char_count > 0) {
1753                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1754                 tp->char_count = 0;
1755         }
1756 }
1757
1758 /*
1759  * Returns the number of characters in the output buffer. This is
1760  * used in tty_wait_until_sent to wait until all characters have
1761  * appeared on the screen.
1762  */
1763 static int
1764 tty3270_chars_in_buffer(struct tty_struct *tty)
1765 {
1766         return 0;
1767 }
1768
1769 static void
1770 tty3270_flush_buffer(struct tty_struct *tty)
1771 {
1772 }
1773
1774 /*
1775  * Check for visible/invisible input switches
1776  */
1777 static void
1778 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1779 {
1780         struct tty3270 *tp;
1781         int new;
1782
1783         tp = tty->driver_data;
1784         if (!tp)
1785                 return;
1786         spin_lock_bh(&tp->view.lock);
1787         if (L_ICANON(tty)) {
1788                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1789                 if (new != tp->inattr) {
1790                         tp->inattr = new;
1791                         tty3270_update_prompt(tp, NULL, 0);
1792                         tty3270_set_timer(tp, 1);
1793                 }
1794         }
1795         spin_unlock_bh(&tp->view.lock);
1796 }
1797
1798 /*
1799  * Disable reading from a 3270 tty
1800  */
1801 static void
1802 tty3270_throttle(struct tty_struct * tty)
1803 {
1804         struct tty3270 *tp;
1805
1806         tp = tty->driver_data;
1807         if (!tp)
1808                 return;
1809         tp->throttle = 1;
1810 }
1811
1812 /*
1813  * Enable reading from a 3270 tty
1814  */
1815 static void
1816 tty3270_unthrottle(struct tty_struct * tty)
1817 {
1818         struct tty3270 *tp;
1819
1820         tp = tty->driver_data;
1821         if (!tp)
1822                 return;
1823         tp->throttle = 0;
1824         if (tp->attn)
1825                 tty3270_issue_read(tp, 1);
1826 }
1827
1828 /*
1829  * Hang up the tty device.
1830  */
1831 static void
1832 tty3270_hangup(struct tty_struct *tty)
1833 {
1834         struct tty3270 *tp;
1835
1836         tp = tty->driver_data;
1837         if (!tp)
1838                 return;
1839         spin_lock_bh(&tp->view.lock);
1840         tp->cx = tp->saved_cx = 0;
1841         tp->cy = tp->saved_cy = 0;
1842         tp->highlight = tp->saved_highlight = TAX_RESET;
1843         tp->f_color = tp->saved_f_color = TAC_RESET;
1844         tty3270_blank_screen(tp);
1845         while (tp->nr_lines < tp->view.rows - 2)
1846                 tty3270_blank_line(tp);
1847         tp->update_flags = TTY_UPDATE_ALL;
1848         spin_unlock_bh(&tp->view.lock);
1849         tty3270_set_timer(tp, 1);
1850 }
1851
1852 static void
1853 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1854 {
1855 }
1856
1857 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1858                          unsigned long arg)
1859 {
1860         struct tty3270 *tp;
1861
1862         tp = tty->driver_data;
1863         if (!tp)
1864                 return -ENODEV;
1865         if (tty_io_error(tty))
1866                 return -EIO;
1867         return kbd_ioctl(tp->kbd, cmd, arg);
1868 }
1869
1870 #ifdef CONFIG_COMPAT
1871 static long tty3270_compat_ioctl(struct tty_struct *tty,
1872                                  unsigned int cmd, unsigned long arg)
1873 {
1874         struct tty3270 *tp;
1875
1876         tp = tty->driver_data;
1877         if (!tp)
1878                 return -ENODEV;
1879         if (tty_io_error(tty))
1880                 return -EIO;
1881         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1882 }
1883 #endif
1884
1885 static const struct tty_operations tty3270_ops = {
1886         .install = tty3270_install,
1887         .cleanup = tty3270_cleanup,
1888         .open = tty3270_open,
1889         .close = tty3270_close,
1890         .write = tty3270_write,
1891         .put_char = tty3270_put_char,
1892         .flush_chars = tty3270_flush_chars,
1893         .write_room = tty3270_write_room,
1894         .chars_in_buffer = tty3270_chars_in_buffer,
1895         .flush_buffer = tty3270_flush_buffer,
1896         .throttle = tty3270_throttle,
1897         .unthrottle = tty3270_unthrottle,
1898         .hangup = tty3270_hangup,
1899         .wait_until_sent = tty3270_wait_until_sent,
1900         .ioctl = tty3270_ioctl,
1901 #ifdef CONFIG_COMPAT
1902         .compat_ioctl = tty3270_compat_ioctl,
1903 #endif
1904         .set_termios = tty3270_set_termios
1905 };
1906
1907 static void tty3270_create_cb(int minor)
1908 {
1909         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1910 }
1911
1912 static void tty3270_destroy_cb(int minor)
1913 {
1914         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1915 }
1916
1917 static struct raw3270_notifier tty3270_notifier =
1918 {
1919         .create = tty3270_create_cb,
1920         .destroy = tty3270_destroy_cb,
1921 };
1922
1923 /*
1924  * 3270 tty registration code called from tty_init().
1925  * Most kernel services (incl. kmalloc) are available at this poimt.
1926  */
1927 static int __init tty3270_init(void)
1928 {
1929         struct tty_driver *driver;
1930         int ret;
1931
1932         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1933                                   TTY_DRIVER_REAL_RAW |
1934                                   TTY_DRIVER_DYNAMIC_DEV |
1935                                   TTY_DRIVER_RESET_TERMIOS);
1936         if (IS_ERR(driver))
1937                 return PTR_ERR(driver);
1938
1939         /*
1940          * Initialize the tty_driver structure
1941          * Entries in tty3270_driver that are NOT initialized:
1942          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1943          */
1944         driver->driver_name = "tty3270";
1945         driver->name = "3270/tty";
1946         driver->major = IBM_TTY3270_MAJOR;
1947         driver->minor_start = RAW3270_FIRSTMINOR;
1948         driver->name_base = RAW3270_FIRSTMINOR;
1949         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1950         driver->subtype = SYSTEM_TYPE_TTY;
1951         driver->init_termios = tty_std_termios;
1952         tty_set_operations(driver, &tty3270_ops);
1953         ret = tty_register_driver(driver);
1954         if (ret) {
1955                 put_tty_driver(driver);
1956                 return ret;
1957         }
1958         tty3270_driver = driver;
1959         raw3270_register_notifier(&tty3270_notifier);
1960         return 0;
1961 }
1962
1963 static void __exit
1964 tty3270_exit(void)
1965 {
1966         struct tty_driver *driver;
1967
1968         raw3270_unregister_notifier(&tty3270_notifier);
1969         driver = tty3270_driver;
1970         tty3270_driver = NULL;
1971         tty_unregister_driver(driver);
1972         put_tty_driver(driver);
1973         tty3270_del_views();
1974 }
1975
1976 MODULE_LICENSE("GPL");
1977 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1978
1979 module_init(tty3270_init);
1980 module_exit(tty3270_exit);