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/bootmem.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(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
 723         if (!tp->freemem_pages)
 724                 goto out_tp;
 725         INIT_LIST_HEAD(&tp->freemem);
 726         INIT_LIST_HEAD(&tp->lines);
 727         INIT_LIST_HEAD(&tp->update);
 728         INIT_LIST_HEAD(&tp->rcl_lines);
 729         tp->rcl_max = 20;
 730
 731         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
 732                 tp->freemem_pages[pages] = (void *)
 733                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
 734                 if (!tp->freemem_pages[pages])
 735                         goto out_pages;
 736                 add_string_memory(&tp->freemem,
 737                                   tp->freemem_pages[pages], PAGE_SIZE);
 738         }
 739         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
 740         if (IS_ERR(tp->write))
 741                 goto out_pages;
 742         tp->read = raw3270_request_alloc(0);
 743         if (IS_ERR(tp->read))
 744                 goto out_write;
 745         tp->kreset = raw3270_request_alloc(1);
 746         if (IS_ERR(tp->kreset))
 747                 goto out_read;
 748         tp->kbd = kbd_alloc();
 749         if (!tp->kbd)
 750                 goto out_reset;
 751
 752         tty_port_init(&tp->port);
 753         timer_setup(&tp->timer, tty3270_update, 0);
 754         tasklet_init(&tp->readlet,
 755                      (void (*)(unsigned long)) tty3270_read_tasklet,
 756                      (unsigned long) tp->read);
 757         tasklet_init(&tp->hanglet,
 758                      (void (*)(unsigned long)) tty3270_hangup_tasklet,
 759                      (unsigned long) tp);
 760         INIT_WORK(&tp->resize_work, tty3270_resize_work);
 761
 762         return tp;
 763
 764 out_reset:
 765         raw3270_request_free(tp->kreset);
 766 out_read:
 767         raw3270_request_free(tp->read);
 768 out_write:
 769         raw3270_request_free(tp->write);
 770 out_pages:
 771         while (pages--)
 772                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 773         kfree(tp->freemem_pages);
 774         tty_port_destroy(&tp->port);
 775 out_tp:
 776         kfree(tp);
 777 out_err:
 778         return ERR_PTR(-ENOMEM);
 779 }
 780
 781 /*
 782  * Free tty3270 structure.
 783  */
 784 static void
 785 tty3270_free_view(struct tty3270 *tp)
 786 {
 787         int pages;
 788
 789         kbd_free(tp->kbd);
 790         raw3270_request_free(tp->kreset);
 791         raw3270_request_free(tp->read);
 792         raw3270_request_free(tp->write);
 793         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
 794                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
 795         kfree(tp->freemem_pages);
 796         tty_port_destroy(&tp->port);
 797         kfree(tp);
 798 }
 799
 800 /*
 801  * Allocate tty3270 screen.
 802  */
 803 static struct tty3270_line *
 804 tty3270_alloc_screen(unsigned int rows, unsigned int cols)
 805 {
 806         struct tty3270_line *screen;
 807         unsigned long size;
 808         int lines;
 809
 810         size = sizeof(struct tty3270_line) * (rows - 2);
 811         screen = kzalloc(size, GFP_KERNEL);
 812         if (!screen)
 813                 goto out_err;
 814         for (lines = 0; lines < rows - 2; lines++) {
 815                 size = sizeof(struct tty3270_cell) * cols;
 816                 screen[lines].cells = kzalloc(size, GFP_KERNEL);
 817                 if (!screen[lines].cells)
 818                         goto out_screen;
 819         }
 820         return screen;
 821 out_screen:
 822         while (lines--)
 823                 kfree(screen[lines].cells);
 824         kfree(screen);
 825 out_err:
 826         return ERR_PTR(-ENOMEM);
 827 }
 828
 829 /*
 830  * Free tty3270 screen.
 831  */
 832 static void
 833 tty3270_free_screen(struct tty3270_line *screen, unsigned int rows)
 834 {
 835         int lines;
 836
 837         for (lines = 0; lines < rows - 2; lines++)
 838                 kfree(screen[lines].cells);
 839         kfree(screen);
 840 }
 841
 842 /*
 843  * Resize tty3270 screen
 844  */
 845 static void tty3270_resize_work(struct work_struct *work)
 846 {
 847         struct tty3270 *tp = container_of(work, struct tty3270, resize_work);
 848         struct tty3270_line *screen, *oscreen;
 849         struct tty_struct *tty;
 850         unsigned int orows;
 851         struct winsize ws;
 852
 853         screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
 854         if (IS_ERR(screen))
 855                 return;
 856         /* Switch to new output size */
 857         spin_lock_bh(&tp->view.lock);
 858         tty3270_blank_screen(tp);
 859         oscreen = tp->screen;
 860         orows = tp->view.rows;
 861         tp->view.model = tp->n_model;
 862         tp->view.rows = tp->n_rows;
 863         tp->view.cols = tp->n_cols;
 864         tp->screen = screen;
 865         free_string(&tp->freemem, tp->prompt);
 866         free_string(&tp->freemem, tp->status);
 867         tty3270_create_prompt(tp);
 868         tty3270_create_status(tp);
 869         while (tp->nr_lines < tp->view.rows - 2)
 870                 tty3270_blank_line(tp);
 871         tp->update_flags = TTY_UPDATE_ALL;
 872         spin_unlock_bh(&tp->view.lock);
 873         tty3270_free_screen(oscreen, orows);
 874         tty3270_set_timer(tp, 1);
 875         /* Informat tty layer about new size */
 876         tty = tty_port_tty_get(&tp->port);
 877         if (!tty)
 878                 return;
 879         ws.ws_row = tp->view.rows - 2;
 880         ws.ws_col = tp->view.cols;
 881         tty_do_resize(tty, &ws);
 882         tty_kref_put(tty);
 883 }
 884
 885 static void
 886 tty3270_resize(struct raw3270_view *view, int model, int rows, int cols)
 887 {
 888         struct tty3270 *tp = container_of(view, struct tty3270, view);
 889
 890         if (tp->n_model == model && tp->n_rows == rows && tp->n_cols == cols)
 891                 return;
 892         tp->n_model = model;
 893         tp->n_rows = rows;
 894         tp->n_cols = cols;
 895         schedule_work(&tp->resize_work);
 896 }
 897
 898 /*
 899  * Unlink tty3270 data structure from tty.
 900  */
 901 static void
 902 tty3270_release(struct raw3270_view *view)
 903 {
 904         struct tty3270 *tp = container_of(view, struct tty3270, view);
 905         struct tty_struct *tty = tty_port_tty_get(&tp->port);
 906
 907         if (tty) {
 908                 tty->driver_data = NULL;
 909                 tty_port_tty_set(&tp->port, NULL);
 910                 tty_hangup(tty);
 911                 raw3270_put_view(&tp->view);
 912                 tty_kref_put(tty);
 913         }
 914 }
 915
 916 /*
 917  * Free tty3270 data structure
 918  */
 919 static void
 920 tty3270_free(struct raw3270_view *view)
 921 {
 922         struct tty3270 *tp = container_of(view, struct tty3270, view);
 923
 924         del_timer_sync(&tp->timer);
 925         tty3270_free_screen(tp->screen, tp->view.rows);
 926         tty3270_free_view(tp);
 927 }
 928
 929 /*
 930  * Delayed freeing of tty3270 views.
 931  */
 932 static void
 933 tty3270_del_views(void)
 934 {
 935         int i;
 936
 937         for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
 938                 struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
 939                 if (!IS_ERR(view))
 940                         raw3270_del_view(view);
 941         }
 942 }
 943
 944 static struct raw3270_fn tty3270_fn = {
 945         .activate = tty3270_activate,
 946         .deactivate = tty3270_deactivate,
 947         .intv = (void *) tty3270_irq,
 948         .release = tty3270_release,
 949         .free = tty3270_free,
 950         .resize = tty3270_resize
 951 };
 952
 953 /*
 954  * This routine is called whenever a 3270 tty is opened first time.
 955  */
 956 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 957 {
 958         struct raw3270_view *view;
 959         struct tty3270 *tp;
 960         int i, rc;
 961
 962         /* Check if the tty3270 is already there. */
 963         view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR);
 964         if (!IS_ERR(view)) {
 965                 tp = container_of(view, struct tty3270, view);
 966                 tty->driver_data = tp;
 967                 tty->winsize.ws_row = tp->view.rows - 2;
 968                 tty->winsize.ws_col = tp->view.cols;
 969                 tp->port.low_latency = 0;
 970                 tp->inattr = TF_INPUT;
 971                 goto port_install;
 972         }
 973         if (tty3270_max_index < tty->index + 1)
 974                 tty3270_max_index = tty->index + 1;
 975
 976         /* Allocate tty3270 structure on first open. */
 977         tp = tty3270_alloc_view();
 978         if (IS_ERR(tp))
 979                 return PTR_ERR(tp);
 980
 981         rc = raw3270_add_view(&tp->view, &tty3270_fn,
 982                               tty->index + RAW3270_FIRSTMINOR);
 983         if (rc) {
 984                 tty3270_free_view(tp);
 985                 return rc;
 986         }
 987
 988         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 989         if (IS_ERR(tp->screen)) {
 990                 rc = PTR_ERR(tp->screen);
 991                 raw3270_put_view(&tp->view);
 992                 raw3270_del_view(&tp->view);
 993                 tty3270_free_view(tp);
 994                 return rc;
 995         }
 996
 997         tp->port.low_latency = 0;
 998         tty->winsize.ws_row = tp->view.rows - 2;
 999         tty->winsize.ws_col = tp->view.cols;
1000
1001         tty3270_create_prompt(tp);
1002         tty3270_create_status(tp);
1003         tty3270_update_status(tp);
1004
1005         /* Create blank line for every line in the tty output area. */
1006         for (i = 0; i < tp->view.rows - 2; i++)
1007                 tty3270_blank_line(tp);
1008
1009         tp->kbd->port = &tp->port;
1010         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
1011         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
1012         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
1013         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
1014         kbd_ascebc(tp->kbd, tp->view.ascebc);
1015
1016         raw3270_activate_view(&tp->view);
1017
1018 port_install:
1019         rc = tty_port_install(&tp->port, driver, tty);
1020         if (rc) {
1021                 raw3270_put_view(&tp->view);
1022                 return rc;
1023         }
1024
1025         tty->driver_data = tp;
1026
1027         return 0;
1028 }
1029
1030 /*
1031  * This routine is called whenever a 3270 tty is opened.
1032  */
1033 static int
1034 tty3270_open(struct tty_struct *tty, struct file *filp)
1035 {
1036         struct tty3270 *tp = tty->driver_data;
1037         struct tty_port *port = &tp->port;
1038
1039         port->count++;
1040         tty_port_tty_set(port, tty);
1041         return 0;
1042 }
1043
1044 /*
1045  * This routine is called when the 3270 tty is closed. We wait
1046  * for the remaining request to be completed. Then we clean up.
1047  */
1048 static void
1049 tty3270_close(struct tty_struct *tty, struct file * filp)
1050 {
1051         struct tty3270 *tp = tty->driver_data;
1052
1053         if (tty->count > 1)
1054                 return;
1055         if (tp)
1056                 tty_port_tty_set(&tp->port, NULL);
1057 }
1058
1059 static void tty3270_cleanup(struct tty_struct *tty)
1060 {
1061         struct tty3270 *tp = tty->driver_data;
1062
1063         if (tp) {
1064                 tty->driver_data = NULL;
1065                 raw3270_put_view(&tp->view);
1066         }
1067 }
1068
1069 /*
1070  * We always have room.
1071  */
1072 static int
1073 tty3270_write_room(struct tty_struct *tty)
1074 {
1075         return INT_MAX;
1076 }
1077
1078 /*
1079  * Insert character into the screen at the current position with the
1080  * current color and highlight. This function does NOT do cursor movement.
1081  */
1082 static void tty3270_put_character(struct tty3270 *tp, char ch)
1083 {
1084         struct tty3270_line *line;
1085         struct tty3270_cell *cell;
1086
1087         line = tp->screen + tp->cy;
1088         if (line->len <= tp->cx) {
1089                 while (line->len < tp->cx) {
1090                         cell = line->cells + line->len;
1091                         cell->character = tp->view.ascebc[' '];
1092                         cell->highlight = tp->highlight;
1093                         cell->f_color = tp->f_color;
1094                         line->len++;
1095                 }
1096                 line->len++;
1097         }
1098         cell = line->cells + tp->cx;
1099         cell->character = tp->view.ascebc[(unsigned int) ch];
1100         cell->highlight = tp->highlight;
1101         cell->f_color = tp->f_color;
1102 }
1103
1104 /*
1105  * Convert a tty3270_line to a 3270 data fragment usable for output.
1106  */
1107 static void
1108 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1109 {
1110         struct tty3270_line *line;
1111         struct tty3270_cell *cell;
1112         struct string *s, *n;
1113         unsigned char highlight;
1114         unsigned char f_color;
1115         char *cp;
1116         int flen, i;
1117
1118         /* Determine how long the fragment will be. */
1119         flen = 3;               /* Prefix (TO_SBA). */
1120         line = tp->screen + line_nr;
1121         flen += line->len;
1122         highlight = TAX_RESET;
1123         f_color = TAC_RESET;
1124         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1125                 if (cell->highlight != highlight) {
1126                         flen += 3;      /* TO_SA to switch highlight. */
1127                         highlight = cell->highlight;
1128                 }
1129                 if (cell->f_color != f_color) {
1130                         flen += 3;      /* TO_SA to switch color. */
1131                         f_color = cell->f_color;
1132                 }
1133         }
1134         if (highlight != TAX_RESET)
1135                 flen += 3;      /* TO_SA to reset hightlight. */
1136         if (f_color != TAC_RESET)
1137                 flen += 3;      /* TO_SA to reset color. */
1138         if (line->len < tp->view.cols)
1139                 flen += 4;      /* Postfix (TO_RA). */
1140
1141         /* Find the line in the list. */
1142         i = tp->view.rows - 2 - line_nr;
1143         list_for_each_entry_reverse(s, &tp->lines, list)
1144                 if (--i <= 0)
1145                         break;
1146         /*
1147          * Check if the line needs to get reallocated.
1148          */
1149         if (s->len != flen) {
1150                 /* Reallocate string. */
1151                 n = tty3270_alloc_string(tp, flen);
1152                 list_add(&n->list, &s->list);
1153                 list_del_init(&s->list);
1154                 if (!list_empty(&s->update))
1155                         list_del_init(&s->update);
1156                 free_string(&tp->freemem, s);
1157                 s = n;
1158         }
1159
1160         /* Write 3270 data fragment. */
1161         cp = s->string;
1162         *cp++ = TO_SBA;
1163         *cp++ = 0;
1164         *cp++ = 0;
1165
1166         highlight = TAX_RESET;
1167         f_color = TAC_RESET;
1168         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1169                 if (cell->highlight != highlight) {
1170                         *cp++ = TO_SA;
1171                         *cp++ = TAT_EXTHI;
1172                         *cp++ = cell->highlight;
1173                         highlight = cell->highlight;
1174                 }
1175                 if (cell->f_color != f_color) {
1176                         *cp++ = TO_SA;
1177                         *cp++ = TAT_COLOR;
1178                         *cp++ = cell->f_color;
1179                         f_color = cell->f_color;
1180                 }
1181                 *cp++ = cell->character;
1182         }
1183         if (highlight != TAX_RESET) {
1184                 *cp++ = TO_SA;
1185                 *cp++ = TAT_EXTHI;
1186                 *cp++ = TAX_RESET;
1187         }
1188         if (f_color != TAC_RESET) {
1189                 *cp++ = TO_SA;
1190                 *cp++ = TAT_COLOR;
1191                 *cp++ = TAC_RESET;
1192         }
1193         if (line->len < tp->view.cols) {
1194                 *cp++ = TO_RA;
1195                 *cp++ = 0;
1196                 *cp++ = 0;
1197                 *cp++ = 0;
1198         }
1199
1200         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1201                 /* Line is currently visible on screen. */
1202                 tty3270_update_string(tp, s, line_nr);
1203                 /* Add line to update list. */
1204                 if (list_empty(&s->update)) {
1205                         list_add_tail(&s->update, &tp->update);
1206                         tp->update_flags |= TTY_UPDATE_LIST;
1207                 }
1208         }
1209 }
1210
1211 /*
1212  * Do carriage return.
1213  */
1214 static void
1215 tty3270_cr(struct tty3270 *tp)
1216 {
1217         tp->cx = 0;
1218 }
1219
1220 /*
1221  * Do line feed.
1222  */
1223 static void
1224 tty3270_lf(struct tty3270 *tp)
1225 {
1226         struct tty3270_line temp;
1227         int i;
1228
1229         tty3270_convert_line(tp, tp->cy);
1230         if (tp->cy < tp->view.rows - 3) {
1231                 tp->cy++;
1232                 return;
1233         }
1234         /* Last line just filled up. Add new, blank line. */
1235         tty3270_blank_line(tp);
1236         temp = tp->screen[0];
1237         temp.len = 0;
1238         for (i = 0; i < tp->view.rows - 3; i++)
1239                 tp->screen[i] = tp->screen[i+1];
1240         tp->screen[tp->view.rows - 3] = temp;
1241         tty3270_rebuild_update(tp);
1242 }
1243
1244 static void
1245 tty3270_ri(struct tty3270 *tp)
1246 {
1247         if (tp->cy > 0) {
1248             tty3270_convert_line(tp, tp->cy);
1249             tp->cy--;
1250         }
1251 }
1252
1253 /*
1254  * Insert characters at current position.
1255  */
1256 static void
1257 tty3270_insert_characters(struct tty3270 *tp, int n)
1258 {
1259         struct tty3270_line *line;
1260         int k;
1261
1262         line = tp->screen + tp->cy;
1263         while (line->len < tp->cx) {
1264                 line->cells[line->len].character = tp->view.ascebc[' '];
1265                 line->cells[line->len].highlight = TAX_RESET;
1266                 line->cells[line->len].f_color = TAC_RESET;
1267                 line->len++;
1268         }
1269         if (n > tp->view.cols - tp->cx)
1270                 n = tp->view.cols - tp->cx;
1271         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1272         while (k--)
1273                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1274         line->len += n;
1275         if (line->len > tp->view.cols)
1276                 line->len = tp->view.cols;
1277         while (n-- > 0) {
1278                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1279                 line->cells[tp->cx + n].highlight = tp->highlight;
1280                 line->cells[tp->cx + n].f_color = tp->f_color;
1281         }
1282 }
1283
1284 /*
1285  * Delete characters at current position.
1286  */
1287 static void
1288 tty3270_delete_characters(struct tty3270 *tp, int n)
1289 {
1290         struct tty3270_line *line;
1291         int i;
1292
1293         line = tp->screen + tp->cy;
1294         if (line->len <= tp->cx)
1295                 return;
1296         if (line->len - tp->cx <= n) {
1297                 line->len = tp->cx;
1298                 return;
1299         }
1300         for (i = tp->cx; i + n < line->len; i++)
1301                 line->cells[i] = line->cells[i + n];
1302         line->len -= n;
1303 }
1304
1305 /*
1306  * Erase characters at current position.
1307  */
1308 static void
1309 tty3270_erase_characters(struct tty3270 *tp, int n)
1310 {
1311         struct tty3270_line *line;
1312         struct tty3270_cell *cell;
1313
1314         line = tp->screen + tp->cy;
1315         while (line->len > tp->cx && n-- > 0) {
1316                 cell = line->cells + tp->cx++;
1317                 cell->character = ' ';
1318                 cell->highlight = TAX_RESET;
1319                 cell->f_color = TAC_RESET;
1320         }
1321         tp->cx += n;
1322         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1323 }
1324
1325 /*
1326  * Erase line, 3 different cases:
1327  *  Esc [ 0 K   Erase from current position to end of line inclusive
1328  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1329  *  Esc [ 2 K   Erase entire line (without moving cursor)
1330  */
1331 static void
1332 tty3270_erase_line(struct tty3270 *tp, int mode)
1333 {
1334         struct tty3270_line *line;
1335         struct tty3270_cell *cell;
1336         int i;
1337
1338         line = tp->screen + tp->cy;
1339         if (mode == 0)
1340                 line->len = tp->cx;
1341         else if (mode == 1) {
1342                 for (i = 0; i < tp->cx; i++) {
1343                         cell = line->cells + i;
1344                         cell->character = ' ';
1345                         cell->highlight = TAX_RESET;
1346                         cell->f_color = TAC_RESET;
1347                 }
1348                 if (line->len <= tp->cx)
1349                         line->len = tp->cx + 1;
1350         } else if (mode == 2)
1351                 line->len = 0;
1352         tty3270_convert_line(tp, tp->cy);
1353 }
1354
1355 /*
1356  * Erase display, 3 different cases:
1357  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1358  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1359  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1360  */
1361 static void
1362 tty3270_erase_display(struct tty3270 *tp, int mode)
1363 {
1364         int i;
1365
1366         if (mode == 0) {
1367                 tty3270_erase_line(tp, 0);
1368                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1369                         tp->screen[i].len = 0;
1370                         tty3270_convert_line(tp, i);
1371                 }
1372         } else if (mode == 1) {
1373                 for (i = 0; i < tp->cy; i++) {
1374                         tp->screen[i].len = 0;
1375                         tty3270_convert_line(tp, i);
1376                 }
1377                 tty3270_erase_line(tp, 1);
1378         } else if (mode == 2) {
1379                 for (i = 0; i < tp->view.rows - 2; i++) {
1380                         tp->screen[i].len = 0;
1381                         tty3270_convert_line(tp, i);
1382                 }
1383         }
1384         tty3270_rebuild_update(tp);
1385 }
1386
1387 /*
1388  * Set attributes found in an escape sequence.
1389  *  Esc [ <attr> ; <attr> ; ... m
1390  */
1391 static void
1392 tty3270_set_attributes(struct tty3270 *tp)
1393 {
1394         static unsigned char f_colors[] = {
1395                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1396                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1397         };
1398         int i, attr;
1399
1400         for (i = 0; i <= tp->esc_npar; i++) {
1401                 attr = tp->esc_par[i];
1402                 switch (attr) {
1403                 case 0:         /* Reset */
1404                         tp->highlight = TAX_RESET;
1405                         tp->f_color = TAC_RESET;
1406                         break;
1407                 /* Highlight. */
1408                 case 4:         /* Start underlining. */
1409                         tp->highlight = TAX_UNDER;
1410                         break;
1411                 case 5:         /* Start blink. */
1412                         tp->highlight = TAX_BLINK;
1413                         break;
1414                 case 7:         /* Start reverse. */
1415                         tp->highlight = TAX_REVER;
1416                         break;
1417                 case 24:        /* End underlining */
1418                         if (tp->highlight == TAX_UNDER)
1419                                 tp->highlight = TAX_RESET;
1420                         break;
1421                 case 25:        /* End blink. */
1422                         if (tp->highlight == TAX_BLINK)
1423                                 tp->highlight = TAX_RESET;
1424                         break;
1425                 case 27:        /* End reverse. */
1426                         if (tp->highlight == TAX_REVER)
1427                                 tp->highlight = TAX_RESET;
1428                         break;
1429                 /* Foreground color. */
1430                 case 30:        /* Black */
1431                 case 31:        /* Red */
1432                 case 32:        /* Green */
1433                 case 33:        /* Yellow */
1434                 case 34:        /* Blue */
1435                 case 35:        /* Magenta */
1436                 case 36:        /* Cyan */
1437                 case 37:        /* White */
1438                 case 39:        /* Black */
1439                         tp->f_color = f_colors[attr - 30];
1440                         break;
1441                 }
1442         }
1443 }
1444
1445 static inline int
1446 tty3270_getpar(struct tty3270 *tp, int ix)
1447 {
1448         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1449 }
1450
1451 static void
1452 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1453 {
1454         int max_cx = max(0, cx);
1455         int max_cy = max(0, cy);
1456
1457         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1458         cy = min_t(int, tp->view.rows - 3, max_cy);
1459         if (cy != tp->cy) {
1460                 tty3270_convert_line(tp, tp->cy);
1461                 tp->cy = cy;
1462         }
1463 }
1464
1465 /*
1466  * Process escape sequences. Known sequences:
1467  *  Esc 7                       Save Cursor Position
1468  *  Esc 8                       Restore Cursor Position
1469  *  Esc [ Pn ; Pn ; .. m        Set attributes
1470  *  Esc [ Pn ; Pn H             Cursor Position
1471  *  Esc [ Pn ; Pn f             Cursor Position
1472  *  Esc [ Pn A                  Cursor Up
1473  *  Esc [ Pn B                  Cursor Down
1474  *  Esc [ Pn C                  Cursor Forward
1475  *  Esc [ Pn D                  Cursor Backward
1476  *  Esc [ Pn G                  Cursor Horizontal Absolute
1477  *  Esc [ Pn X                  Erase Characters
1478  *  Esc [ Ps J                  Erase in Display
1479  *  Esc [ Ps K                  Erase in Line
1480  * // FIXME: add all the new ones.
1481  *
1482  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1483  *  Ps is a selective parameter.
1484  */
1485 static void
1486 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1487 {
1488         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1489
1490         if (tp->esc_state == ESnormal) {
1491                 if (ch == 0x1b)
1492                         /* Starting new escape sequence. */
1493                         tp->esc_state = ESesc;
1494                 return;
1495         }
1496         if (tp->esc_state == ESesc) {
1497                 tp->esc_state = ESnormal;
1498                 switch (ch) {
1499                 case '[':
1500                         tp->esc_state = ESsquare;
1501                         break;
1502                 case 'E':
1503                         tty3270_cr(tp);
1504                         tty3270_lf(tp);
1505                         break;
1506                 case 'M':
1507                         tty3270_ri(tp);
1508                         break;
1509                 case 'D':
1510                         tty3270_lf(tp);
1511                         break;
1512                 case 'Z':               /* Respond ID. */
1513                         kbd_puts_queue(&tp->port, "\033[?6c");
1514                         break;
1515                 case '7':               /* Save cursor position. */
1516                         tp->saved_cx = tp->cx;
1517                         tp->saved_cy = tp->cy;
1518                         tp->saved_highlight = tp->highlight;
1519                         tp->saved_f_color = tp->f_color;
1520                         break;
1521                 case '8':               /* Restore cursor position. */
1522                         tty3270_convert_line(tp, tp->cy);
1523                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1524                         tp->highlight = tp->saved_highlight;
1525                         tp->f_color = tp->saved_f_color;
1526                         break;
1527                 case 'c':               /* Reset terminal. */
1528                         tp->cx = tp->saved_cx = 0;
1529                         tp->cy = tp->saved_cy = 0;
1530                         tp->highlight = tp->saved_highlight = TAX_RESET;
1531                         tp->f_color = tp->saved_f_color = TAC_RESET;
1532                         tty3270_erase_display(tp, 2);
1533                         break;
1534                 }
1535                 return;
1536         }
1537         if (tp->esc_state == ESsquare) {
1538                 tp->esc_state = ESgetpars;
1539                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1540                 tp->esc_npar = 0;
1541                 tp->esc_ques = (ch == '?');
1542                 if (tp->esc_ques)
1543                         return;
1544         }
1545         if (tp->esc_state == ESgetpars) {
1546                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1547                         tp->esc_npar++;
1548                         return;
1549                 }
1550                 if (ch >= '0' && ch <= '9') {
1551                         tp->esc_par[tp->esc_npar] *= 10;
1552                         tp->esc_par[tp->esc_npar] += ch - '0';
1553                         return;
1554                 }
1555         }
1556         tp->esc_state = ESnormal;
1557         if (ch == 'n' && !tp->esc_ques) {
1558                 if (tp->esc_par[0] == 5)                /* Status report. */
1559                         kbd_puts_queue(&tp->port, "\033[0n");
1560                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1561                         char buf[40];
1562                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1563                         kbd_puts_queue(&tp->port, buf);
1564                 }
1565                 return;
1566         }
1567         if (tp->esc_ques)
1568                 return;
1569         switch (ch) {
1570         case 'm':
1571                 tty3270_set_attributes(tp);
1572                 break;
1573         case 'H':       /* Set cursor position. */
1574         case 'f':
1575                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1576                                 tty3270_getpar(tp, 0) - 1);
1577                 break;
1578         case 'd':       /* Set y position. */
1579                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1580                 break;
1581         case 'A':       /* Cursor up. */
1582         case 'F':
1583                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1584                 break;
1585         case 'B':       /* Cursor down. */
1586         case 'e':
1587         case 'E':
1588                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1589                 break;
1590         case 'C':       /* Cursor forward. */
1591         case 'a':
1592                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1593                 break;
1594         case 'D':       /* Cursor backward. */
1595                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1596                 break;
1597         case 'G':       /* Set x position. */
1598         case '`':
1599                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1600                 break;
1601         case 'X':       /* Erase Characters. */
1602                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1603                 break;
1604         case 'J':       /* Erase display. */
1605                 tty3270_erase_display(tp, tp->esc_par[0]);
1606                 break;
1607         case 'K':       /* Erase line. */
1608                 tty3270_erase_line(tp, tp->esc_par[0]);
1609                 break;
1610         case 'P':       /* Delete characters. */
1611                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1612                 break;
1613         case '@':       /* Insert characters. */
1614                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1615                 break;
1616         case 's':       /* Save cursor position. */
1617                 tp->saved_cx = tp->cx;
1618                 tp->saved_cy = tp->cy;
1619                 tp->saved_highlight = tp->highlight;
1620                 tp->saved_f_color = tp->f_color;
1621                 break;
1622         case 'u':       /* Restore cursor position. */
1623                 tty3270_convert_line(tp, tp->cy);
1624                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1625                 tp->highlight = tp->saved_highlight;
1626                 tp->f_color = tp->saved_f_color;
1627                 break;
1628         }
1629 }
1630
1631 /*
1632  * String write routine for 3270 ttys
1633  */
1634 static void
1635 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1636                 const unsigned char *buf, int count)
1637 {
1638         int i_msg, i;
1639
1640         spin_lock_bh(&tp->view.lock);
1641         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1642                 if (tp->esc_state != 0) {
1643                         /* Continue escape sequence. */
1644                         tty3270_escape_sequence(tp, buf[i_msg]);
1645                         continue;
1646                 }
1647
1648                 switch (buf[i_msg]) {
1649                 case 0x07:              /* '\a' -- Alarm */
1650                         tp->wcc |= TW_PLUSALARM;
1651                         break;
1652                 case 0x08:              /* Backspace. */
1653                         if (tp->cx > 0) {
1654                                 tp->cx--;
1655                                 tty3270_put_character(tp, ' ');
1656                         }
1657                         break;
1658                 case 0x09:              /* '\t' -- Tabulate */
1659                         for (i = tp->cx % 8; i < 8; i++) {
1660                                 if (tp->cx >= tp->view.cols) {
1661                                         tty3270_cr(tp);
1662                                         tty3270_lf(tp);
1663                                         break;
1664                                 }
1665                                 tty3270_put_character(tp, ' ');
1666                                 tp->cx++;
1667                         }
1668                         break;
1669                 case 0x0a:              /* '\n' -- New Line */
1670                         tty3270_cr(tp);
1671                         tty3270_lf(tp);
1672                         break;
1673                 case 0x0c:              /* '\f' -- Form Feed */
1674                         tty3270_erase_display(tp, 2);
1675                         tp->cx = tp->cy = 0;
1676                         break;
1677                 case 0x0d:              /* '\r' -- Carriage Return */
1678                         tp->cx = 0;
1679                         break;
1680                 case 0x0f:              /* SuSE "exit alternate mode" */
1681                         break;
1682                 case 0x1b:              /* Start escape sequence. */
1683                         tty3270_escape_sequence(tp, buf[i_msg]);
1684                         break;
1685                 default:                /* Insert normal character. */
1686                         if (tp->cx >= tp->view.cols) {
1687                                 tty3270_cr(tp);
1688                                 tty3270_lf(tp);
1689                         }
1690                         tty3270_put_character(tp, buf[i_msg]);
1691                         tp->cx++;
1692                         break;
1693                 }
1694         }
1695         /* Convert current line to 3270 data fragment. */
1696         tty3270_convert_line(tp, tp->cy);
1697
1698         /* Setup timer to update display after 1/10 second */
1699         if (!timer_pending(&tp->timer))
1700                 tty3270_set_timer(tp, HZ/10);
1701
1702         spin_unlock_bh(&tp->view.lock);
1703 }
1704
1705 /*
1706  * String write routine for 3270 ttys
1707  */
1708 static int
1709 tty3270_write(struct tty_struct * tty,
1710               const unsigned char *buf, int count)
1711 {
1712         struct tty3270 *tp;
1713
1714         tp = tty->driver_data;
1715         if (!tp)
1716                 return 0;
1717         if (tp->char_count > 0) {
1718                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1719                 tp->char_count = 0;
1720         }
1721         tty3270_do_write(tp, tty, buf, count);
1722         return count;
1723 }
1724
1725 /*
1726  * Put single characters to the ttys character buffer
1727  */
1728 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1729 {
1730         struct tty3270 *tp;
1731
1732         tp = tty->driver_data;
1733         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1734                 return 0;
1735         tp->char_buf[tp->char_count++] = ch;
1736         return 1;
1737 }
1738
1739 /*
1740  * Flush all characters from the ttys characeter buffer put there
1741  * by tty3270_put_char.
1742  */
1743 static void
1744 tty3270_flush_chars(struct tty_struct *tty)
1745 {
1746         struct tty3270 *tp;
1747
1748         tp = tty->driver_data;
1749         if (!tp)
1750                 return;
1751         if (tp->char_count > 0) {
1752                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1753                 tp->char_count = 0;
1754         }
1755 }
1756
1757 /*
1758  * Returns the number of characters in the output buffer. This is
1759  * used in tty_wait_until_sent to wait until all characters have
1760  * appeared on the screen.
1761  */
1762 static int
1763 tty3270_chars_in_buffer(struct tty_struct *tty)
1764 {
1765         return 0;
1766 }
1767
1768 static void
1769 tty3270_flush_buffer(struct tty_struct *tty)
1770 {
1771 }
1772
1773 /*
1774  * Check for visible/invisible input switches
1775  */
1776 static void
1777 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1778 {
1779         struct tty3270 *tp;
1780         int new;
1781
1782         tp = tty->driver_data;
1783         if (!tp)
1784                 return;
1785         spin_lock_bh(&tp->view.lock);
1786         if (L_ICANON(tty)) {
1787                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1788                 if (new != tp->inattr) {
1789                         tp->inattr = new;
1790                         tty3270_update_prompt(tp, NULL, 0);
1791                         tty3270_set_timer(tp, 1);
1792                 }
1793         }
1794         spin_unlock_bh(&tp->view.lock);
1795 }
1796
1797 /*
1798  * Disable reading from a 3270 tty
1799  */
1800 static void
1801 tty3270_throttle(struct tty_struct * tty)
1802 {
1803         struct tty3270 *tp;
1804
1805         tp = tty->driver_data;
1806         if (!tp)
1807                 return;
1808         tp->throttle = 1;
1809 }
1810
1811 /*
1812  * Enable reading from a 3270 tty
1813  */
1814 static void
1815 tty3270_unthrottle(struct tty_struct * tty)
1816 {
1817         struct tty3270 *tp;
1818
1819         tp = tty->driver_data;
1820         if (!tp)
1821                 return;
1822         tp->throttle = 0;
1823         if (tp->attn)
1824                 tty3270_issue_read(tp, 1);
1825 }
1826
1827 /*
1828  * Hang up the tty device.
1829  */
1830 static void
1831 tty3270_hangup(struct tty_struct *tty)
1832 {
1833         struct tty3270 *tp;
1834
1835         tp = tty->driver_data;
1836         if (!tp)
1837                 return;
1838         spin_lock_bh(&tp->view.lock);
1839         tp->cx = tp->saved_cx = 0;
1840         tp->cy = tp->saved_cy = 0;
1841         tp->highlight = tp->saved_highlight = TAX_RESET;
1842         tp->f_color = tp->saved_f_color = TAC_RESET;
1843         tty3270_blank_screen(tp);
1844         while (tp->nr_lines < tp->view.rows - 2)
1845                 tty3270_blank_line(tp);
1846         tp->update_flags = TTY_UPDATE_ALL;
1847         spin_unlock_bh(&tp->view.lock);
1848         tty3270_set_timer(tp, 1);
1849 }
1850
1851 static void
1852 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1853 {
1854 }
1855
1856 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1857                          unsigned long arg)
1858 {
1859         struct tty3270 *tp;
1860
1861         tp = tty->driver_data;
1862         if (!tp)
1863                 return -ENODEV;
1864         if (tty_io_error(tty))
1865                 return -EIO;
1866         return kbd_ioctl(tp->kbd, cmd, arg);
1867 }
1868
1869 #ifdef CONFIG_COMPAT
1870 static long tty3270_compat_ioctl(struct tty_struct *tty,
1871                                  unsigned int cmd, unsigned long arg)
1872 {
1873         struct tty3270 *tp;
1874
1875         tp = tty->driver_data;
1876         if (!tp)
1877                 return -ENODEV;
1878         if (tty_io_error(tty))
1879                 return -EIO;
1880         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1881 }
1882 #endif
1883
1884 static const struct tty_operations tty3270_ops = {
1885         .install = tty3270_install,
1886         .cleanup = tty3270_cleanup,
1887         .open = tty3270_open,
1888         .close = tty3270_close,
1889         .write = tty3270_write,
1890         .put_char = tty3270_put_char,
1891         .flush_chars = tty3270_flush_chars,
1892         .write_room = tty3270_write_room,
1893         .chars_in_buffer = tty3270_chars_in_buffer,
1894         .flush_buffer = tty3270_flush_buffer,
1895         .throttle = tty3270_throttle,
1896         .unthrottle = tty3270_unthrottle,
1897         .hangup = tty3270_hangup,
1898         .wait_until_sent = tty3270_wait_until_sent,
1899         .ioctl = tty3270_ioctl,
1900 #ifdef CONFIG_COMPAT
1901         .compat_ioctl = tty3270_compat_ioctl,
1902 #endif
1903         .set_termios = tty3270_set_termios
1904 };
1905
1906 static void tty3270_create_cb(int minor)
1907 {
1908         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1909 }
1910
1911 static void tty3270_destroy_cb(int minor)
1912 {
1913         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1914 }
1915
1916 static struct raw3270_notifier tty3270_notifier =
1917 {
1918         .create = tty3270_create_cb,
1919         .destroy = tty3270_destroy_cb,
1920 };
1921
1922 /*
1923  * 3270 tty registration code called from tty_init().
1924  * Most kernel services (incl. kmalloc) are available at this poimt.
1925  */
1926 static int __init tty3270_init(void)
1927 {
1928         struct tty_driver *driver;
1929         int ret;
1930
1931         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1932                                   TTY_DRIVER_REAL_RAW |
1933                                   TTY_DRIVER_DYNAMIC_DEV |
1934                                   TTY_DRIVER_RESET_TERMIOS);
1935         if (IS_ERR(driver))
1936                 return PTR_ERR(driver);
1937
1938         /*
1939          * Initialize the tty_driver structure
1940          * Entries in tty3270_driver that are NOT initialized:
1941          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1942          */
1943         driver->driver_name = "tty3270";
1944         driver->name = "3270/tty";
1945         driver->major = IBM_TTY3270_MAJOR;
1946         driver->minor_start = RAW3270_FIRSTMINOR;
1947         driver->name_base = RAW3270_FIRSTMINOR;
1948         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1949         driver->subtype = SYSTEM_TYPE_TTY;
1950         driver->init_termios = tty_std_termios;
1951         tty_set_operations(driver, &tty3270_ops);
1952         ret = tty_register_driver(driver);
1953         if (ret) {
1954                 put_tty_driver(driver);
1955                 return ret;
1956         }
1957         tty3270_driver = driver;
1958         raw3270_register_notifier(&tty3270_notifier);
1959         return 0;
1960 }
1961
1962 static void __exit
1963 tty3270_exit(void)
1964 {
1965         struct tty_driver *driver;
1966
1967         raw3270_unregister_notifier(&tty3270_notifier);
1968         driver = tty3270_driver;
1969         tty3270_driver = NULL;
1970         tty_unregister_driver(driver);
1971         put_tty_driver(driver);
1972         tty3270_del_views();
1973 }
1974
1975 MODULE_LICENSE("GPL");
1976 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1977
1978 module_init(tty3270_init);
1979 module_exit(tty3270_exit);