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_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                               RAW3270_VIEW_LOCK_BH);
 985         if (rc) {
 986                 tty3270_free_view(tp);
 987                 return rc;
 988         }
 989
 990         tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols);
 991         if (IS_ERR(tp->screen)) {
 992                 rc = PTR_ERR(tp->screen);
 993                 raw3270_put_view(&tp->view);
 994                 raw3270_del_view(&tp->view);
 995                 tty3270_free_view(tp);
 996                 return rc;
 997         }
 998
 999         tp->port.low_latency = 0;
1000         tty->winsize.ws_row = tp->view.rows - 2;
1001         tty->winsize.ws_col = tp->view.cols;
1002
1003         tty3270_create_prompt(tp);
1004         tty3270_create_status(tp);
1005         tty3270_update_status(tp);
1006
1007         /* Create blank line for every line in the tty output area. */
1008         for (i = 0; i < tp->view.rows - 2; i++)
1009                 tty3270_blank_line(tp);
1010
1011         tp->kbd->port = &tp->port;
1012         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
1013         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
1014         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
1015         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
1016         kbd_ascebc(tp->kbd, tp->view.ascebc);
1017
1018         raw3270_activate_view(&tp->view);
1019
1020 port_install:
1021         rc = tty_port_install(&tp->port, driver, tty);
1022         if (rc) {
1023                 raw3270_put_view(&tp->view);
1024                 return rc;
1025         }
1026
1027         tty->driver_data = tp;
1028
1029         return 0;
1030 }
1031
1032 /*
1033  * This routine is called whenever a 3270 tty is opened.
1034  */
1035 static int
1036 tty3270_open(struct tty_struct *tty, struct file *filp)
1037 {
1038         struct tty3270 *tp = tty->driver_data;
1039         struct tty_port *port = &tp->port;
1040
1041         port->count++;
1042         tty_port_tty_set(port, tty);
1043         return 0;
1044 }
1045
1046 /*
1047  * This routine is called when the 3270 tty is closed. We wait
1048  * for the remaining request to be completed. Then we clean up.
1049  */
1050 static void
1051 tty3270_close(struct tty_struct *tty, struct file * filp)
1052 {
1053         struct tty3270 *tp = tty->driver_data;
1054
1055         if (tty->count > 1)
1056                 return;
1057         if (tp)
1058                 tty_port_tty_set(&tp->port, NULL);
1059 }
1060
1061 static void tty3270_cleanup(struct tty_struct *tty)
1062 {
1063         struct tty3270 *tp = tty->driver_data;
1064
1065         if (tp) {
1066                 tty->driver_data = NULL;
1067                 raw3270_put_view(&tp->view);
1068         }
1069 }
1070
1071 /*
1072  * We always have room.
1073  */
1074 static int
1075 tty3270_write_room(struct tty_struct *tty)
1076 {
1077         return INT_MAX;
1078 }
1079
1080 /*
1081  * Insert character into the screen at the current position with the
1082  * current color and highlight. This function does NOT do cursor movement.
1083  */
1084 static void tty3270_put_character(struct tty3270 *tp, char ch)
1085 {
1086         struct tty3270_line *line;
1087         struct tty3270_cell *cell;
1088
1089         line = tp->screen + tp->cy;
1090         if (line->len <= tp->cx) {
1091                 while (line->len < tp->cx) {
1092                         cell = line->cells + line->len;
1093                         cell->character = tp->view.ascebc[' '];
1094                         cell->highlight = tp->highlight;
1095                         cell->f_color = tp->f_color;
1096                         line->len++;
1097                 }
1098                 line->len++;
1099         }
1100         cell = line->cells + tp->cx;
1101         cell->character = tp->view.ascebc[(unsigned int) ch];
1102         cell->highlight = tp->highlight;
1103         cell->f_color = tp->f_color;
1104 }
1105
1106 /*
1107  * Convert a tty3270_line to a 3270 data fragment usable for output.
1108  */
1109 static void
1110 tty3270_convert_line(struct tty3270 *tp, int line_nr)
1111 {
1112         struct tty3270_line *line;
1113         struct tty3270_cell *cell;
1114         struct string *s, *n;
1115         unsigned char highlight;
1116         unsigned char f_color;
1117         char *cp;
1118         int flen, i;
1119
1120         /* Determine how long the fragment will be. */
1121         flen = 3;               /* Prefix (TO_SBA). */
1122         line = tp->screen + line_nr;
1123         flen += line->len;
1124         highlight = TAX_RESET;
1125         f_color = TAC_RESET;
1126         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1127                 if (cell->highlight != highlight) {
1128                         flen += 3;      /* TO_SA to switch highlight. */
1129                         highlight = cell->highlight;
1130                 }
1131                 if (cell->f_color != f_color) {
1132                         flen += 3;      /* TO_SA to switch color. */
1133                         f_color = cell->f_color;
1134                 }
1135         }
1136         if (highlight != TAX_RESET)
1137                 flen += 3;      /* TO_SA to reset hightlight. */
1138         if (f_color != TAC_RESET)
1139                 flen += 3;      /* TO_SA to reset color. */
1140         if (line->len < tp->view.cols)
1141                 flen += 4;      /* Postfix (TO_RA). */
1142
1143         /* Find the line in the list. */
1144         i = tp->view.rows - 2 - line_nr;
1145         list_for_each_entry_reverse(s, &tp->lines, list)
1146                 if (--i <= 0)
1147                         break;
1148         /*
1149          * Check if the line needs to get reallocated.
1150          */
1151         if (s->len != flen) {
1152                 /* Reallocate string. */
1153                 n = tty3270_alloc_string(tp, flen);
1154                 list_add(&n->list, &s->list);
1155                 list_del_init(&s->list);
1156                 if (!list_empty(&s->update))
1157                         list_del_init(&s->update);
1158                 free_string(&tp->freemem, s);
1159                 s = n;
1160         }
1161
1162         /* Write 3270 data fragment. */
1163         cp = s->string;
1164         *cp++ = TO_SBA;
1165         *cp++ = 0;
1166         *cp++ = 0;
1167
1168         highlight = TAX_RESET;
1169         f_color = TAC_RESET;
1170         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1171                 if (cell->highlight != highlight) {
1172                         *cp++ = TO_SA;
1173                         *cp++ = TAT_EXTHI;
1174                         *cp++ = cell->highlight;
1175                         highlight = cell->highlight;
1176                 }
1177                 if (cell->f_color != f_color) {
1178                         *cp++ = TO_SA;
1179                         *cp++ = TAT_COLOR;
1180                         *cp++ = cell->f_color;
1181                         f_color = cell->f_color;
1182                 }
1183                 *cp++ = cell->character;
1184         }
1185         if (highlight != TAX_RESET) {
1186                 *cp++ = TO_SA;
1187                 *cp++ = TAT_EXTHI;
1188                 *cp++ = TAX_RESET;
1189         }
1190         if (f_color != TAC_RESET) {
1191                 *cp++ = TO_SA;
1192                 *cp++ = TAT_COLOR;
1193                 *cp++ = TAC_RESET;
1194         }
1195         if (line->len < tp->view.cols) {
1196                 *cp++ = TO_RA;
1197                 *cp++ = 0;
1198                 *cp++ = 0;
1199                 *cp++ = 0;
1200         }
1201
1202         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1203                 /* Line is currently visible on screen. */
1204                 tty3270_update_string(tp, s, line_nr);
1205                 /* Add line to update list. */
1206                 if (list_empty(&s->update)) {
1207                         list_add_tail(&s->update, &tp->update);
1208                         tp->update_flags |= TTY_UPDATE_LIST;
1209                 }
1210         }
1211 }
1212
1213 /*
1214  * Do carriage return.
1215  */
1216 static void
1217 tty3270_cr(struct tty3270 *tp)
1218 {
1219         tp->cx = 0;
1220 }
1221
1222 /*
1223  * Do line feed.
1224  */
1225 static void
1226 tty3270_lf(struct tty3270 *tp)
1227 {
1228         struct tty3270_line temp;
1229         int i;
1230
1231         tty3270_convert_line(tp, tp->cy);
1232         if (tp->cy < tp->view.rows - 3) {
1233                 tp->cy++;
1234                 return;
1235         }
1236         /* Last line just filled up. Add new, blank line. */
1237         tty3270_blank_line(tp);
1238         temp = tp->screen[0];
1239         temp.len = 0;
1240         for (i = 0; i < tp->view.rows - 3; i++)
1241                 tp->screen[i] = tp->screen[i+1];
1242         tp->screen[tp->view.rows - 3] = temp;
1243         tty3270_rebuild_update(tp);
1244 }
1245
1246 static void
1247 tty3270_ri(struct tty3270 *tp)
1248 {
1249         if (tp->cy > 0) {
1250             tty3270_convert_line(tp, tp->cy);
1251             tp->cy--;
1252         }
1253 }
1254
1255 /*
1256  * Insert characters at current position.
1257  */
1258 static void
1259 tty3270_insert_characters(struct tty3270 *tp, int n)
1260 {
1261         struct tty3270_line *line;
1262         int k;
1263
1264         line = tp->screen + tp->cy;
1265         while (line->len < tp->cx) {
1266                 line->cells[line->len].character = tp->view.ascebc[' '];
1267                 line->cells[line->len].highlight = TAX_RESET;
1268                 line->cells[line->len].f_color = TAC_RESET;
1269                 line->len++;
1270         }
1271         if (n > tp->view.cols - tp->cx)
1272                 n = tp->view.cols - tp->cx;
1273         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1274         while (k--)
1275                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1276         line->len += n;
1277         if (line->len > tp->view.cols)
1278                 line->len = tp->view.cols;
1279         while (n-- > 0) {
1280                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1281                 line->cells[tp->cx + n].highlight = tp->highlight;
1282                 line->cells[tp->cx + n].f_color = tp->f_color;
1283         }
1284 }
1285
1286 /*
1287  * Delete characters at current position.
1288  */
1289 static void
1290 tty3270_delete_characters(struct tty3270 *tp, int n)
1291 {
1292         struct tty3270_line *line;
1293         int i;
1294
1295         line = tp->screen + tp->cy;
1296         if (line->len <= tp->cx)
1297                 return;
1298         if (line->len - tp->cx <= n) {
1299                 line->len = tp->cx;
1300                 return;
1301         }
1302         for (i = tp->cx; i + n < line->len; i++)
1303                 line->cells[i] = line->cells[i + n];
1304         line->len -= n;
1305 }
1306
1307 /*
1308  * Erase characters at current position.
1309  */
1310 static void
1311 tty3270_erase_characters(struct tty3270 *tp, int n)
1312 {
1313         struct tty3270_line *line;
1314         struct tty3270_cell *cell;
1315
1316         line = tp->screen + tp->cy;
1317         while (line->len > tp->cx && n-- > 0) {
1318                 cell = line->cells + tp->cx++;
1319                 cell->character = ' ';
1320                 cell->highlight = TAX_RESET;
1321                 cell->f_color = TAC_RESET;
1322         }
1323         tp->cx += n;
1324         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1325 }
1326
1327 /*
1328  * Erase line, 3 different cases:
1329  *  Esc [ 0 K   Erase from current position to end of line inclusive
1330  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1331  *  Esc [ 2 K   Erase entire line (without moving cursor)
1332  */
1333 static void
1334 tty3270_erase_line(struct tty3270 *tp, int mode)
1335 {
1336         struct tty3270_line *line;
1337         struct tty3270_cell *cell;
1338         int i;
1339
1340         line = tp->screen + tp->cy;
1341         if (mode == 0)
1342                 line->len = tp->cx;
1343         else if (mode == 1) {
1344                 for (i = 0; i < tp->cx; i++) {
1345                         cell = line->cells + i;
1346                         cell->character = ' ';
1347                         cell->highlight = TAX_RESET;
1348                         cell->f_color = TAC_RESET;
1349                 }
1350                 if (line->len <= tp->cx)
1351                         line->len = tp->cx + 1;
1352         } else if (mode == 2)
1353                 line->len = 0;
1354         tty3270_convert_line(tp, tp->cy);
1355 }
1356
1357 /*
1358  * Erase display, 3 different cases:
1359  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1360  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1361  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1362  */
1363 static void
1364 tty3270_erase_display(struct tty3270 *tp, int mode)
1365 {
1366         int i;
1367
1368         if (mode == 0) {
1369                 tty3270_erase_line(tp, 0);
1370                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1371                         tp->screen[i].len = 0;
1372                         tty3270_convert_line(tp, i);
1373                 }
1374         } else if (mode == 1) {
1375                 for (i = 0; i < tp->cy; i++) {
1376                         tp->screen[i].len = 0;
1377                         tty3270_convert_line(tp, i);
1378                 }
1379                 tty3270_erase_line(tp, 1);
1380         } else if (mode == 2) {
1381                 for (i = 0; i < tp->view.rows - 2; i++) {
1382                         tp->screen[i].len = 0;
1383                         tty3270_convert_line(tp, i);
1384                 }
1385         }
1386         tty3270_rebuild_update(tp);
1387 }
1388
1389 /*
1390  * Set attributes found in an escape sequence.
1391  *  Esc [ <attr> ; <attr> ; ... m
1392  */
1393 static void
1394 tty3270_set_attributes(struct tty3270 *tp)
1395 {
1396         static unsigned char f_colors[] = {
1397                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1398                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1399         };
1400         int i, attr;
1401
1402         for (i = 0; i <= tp->esc_npar; i++) {
1403                 attr = tp->esc_par[i];
1404                 switch (attr) {
1405                 case 0:         /* Reset */
1406                         tp->highlight = TAX_RESET;
1407                         tp->f_color = TAC_RESET;
1408                         break;
1409                 /* Highlight. */
1410                 case 4:         /* Start underlining. */
1411                         tp->highlight = TAX_UNDER;
1412                         break;
1413                 case 5:         /* Start blink. */
1414                         tp->highlight = TAX_BLINK;
1415                         break;
1416                 case 7:         /* Start reverse. */
1417                         tp->highlight = TAX_REVER;
1418                         break;
1419                 case 24:        /* End underlining */
1420                         if (tp->highlight == TAX_UNDER)
1421                                 tp->highlight = TAX_RESET;
1422                         break;
1423                 case 25:        /* End blink. */
1424                         if (tp->highlight == TAX_BLINK)
1425                                 tp->highlight = TAX_RESET;
1426                         break;
1427                 case 27:        /* End reverse. */
1428                         if (tp->highlight == TAX_REVER)
1429                                 tp->highlight = TAX_RESET;
1430                         break;
1431                 /* Foreground color. */
1432                 case 30:        /* Black */
1433                 case 31:        /* Red */
1434                 case 32:        /* Green */
1435                 case 33:        /* Yellow */
1436                 case 34:        /* Blue */
1437                 case 35:        /* Magenta */
1438                 case 36:        /* Cyan */
1439                 case 37:        /* White */
1440                 case 39:        /* Black */
1441                         tp->f_color = f_colors[attr - 30];
1442                         break;
1443                 }
1444         }
1445 }
1446
1447 static inline int
1448 tty3270_getpar(struct tty3270 *tp, int ix)
1449 {
1450         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1451 }
1452
1453 static void
1454 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1455 {
1456         int max_cx = max(0, cx);
1457         int max_cy = max(0, cy);
1458
1459         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1460         cy = min_t(int, tp->view.rows - 3, max_cy);
1461         if (cy != tp->cy) {
1462                 tty3270_convert_line(tp, tp->cy);
1463                 tp->cy = cy;
1464         }
1465 }
1466
1467 /*
1468  * Process escape sequences. Known sequences:
1469  *  Esc 7                       Save Cursor Position
1470  *  Esc 8                       Restore Cursor Position
1471  *  Esc [ Pn ; Pn ; .. m        Set attributes
1472  *  Esc [ Pn ; Pn H             Cursor Position
1473  *  Esc [ Pn ; Pn f             Cursor Position
1474  *  Esc [ Pn A                  Cursor Up
1475  *  Esc [ Pn B                  Cursor Down
1476  *  Esc [ Pn C                  Cursor Forward
1477  *  Esc [ Pn D                  Cursor Backward
1478  *  Esc [ Pn G                  Cursor Horizontal Absolute
1479  *  Esc [ Pn X                  Erase Characters
1480  *  Esc [ Ps J                  Erase in Display
1481  *  Esc [ Ps K                  Erase in Line
1482  * // FIXME: add all the new ones.
1483  *
1484  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1485  *  Ps is a selective parameter.
1486  */
1487 static void
1488 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1489 {
1490         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1491
1492         if (tp->esc_state == ESnormal) {
1493                 if (ch == 0x1b)
1494                         /* Starting new escape sequence. */
1495                         tp->esc_state = ESesc;
1496                 return;
1497         }
1498         if (tp->esc_state == ESesc) {
1499                 tp->esc_state = ESnormal;
1500                 switch (ch) {
1501                 case '[':
1502                         tp->esc_state = ESsquare;
1503                         break;
1504                 case 'E':
1505                         tty3270_cr(tp);
1506                         tty3270_lf(tp);
1507                         break;
1508                 case 'M':
1509                         tty3270_ri(tp);
1510                         break;
1511                 case 'D':
1512                         tty3270_lf(tp);
1513                         break;
1514                 case 'Z':               /* Respond ID. */
1515                         kbd_puts_queue(&tp->port, "\033[?6c");
1516                         break;
1517                 case '7':               /* Save cursor position. */
1518                         tp->saved_cx = tp->cx;
1519                         tp->saved_cy = tp->cy;
1520                         tp->saved_highlight = tp->highlight;
1521                         tp->saved_f_color = tp->f_color;
1522                         break;
1523                 case '8':               /* Restore cursor position. */
1524                         tty3270_convert_line(tp, tp->cy);
1525                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1526                         tp->highlight = tp->saved_highlight;
1527                         tp->f_color = tp->saved_f_color;
1528                         break;
1529                 case 'c':               /* Reset terminal. */
1530                         tp->cx = tp->saved_cx = 0;
1531                         tp->cy = tp->saved_cy = 0;
1532                         tp->highlight = tp->saved_highlight = TAX_RESET;
1533                         tp->f_color = tp->saved_f_color = TAC_RESET;
1534                         tty3270_erase_display(tp, 2);
1535                         break;
1536                 }
1537                 return;
1538         }
1539         if (tp->esc_state == ESsquare) {
1540                 tp->esc_state = ESgetpars;
1541                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1542                 tp->esc_npar = 0;
1543                 tp->esc_ques = (ch == '?');
1544                 if (tp->esc_ques)
1545                         return;
1546         }
1547         if (tp->esc_state == ESgetpars) {
1548                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1549                         tp->esc_npar++;
1550                         return;
1551                 }
1552                 if (ch >= '0' && ch <= '9') {
1553                         tp->esc_par[tp->esc_npar] *= 10;
1554                         tp->esc_par[tp->esc_npar] += ch - '0';
1555                         return;
1556                 }
1557         }
1558         tp->esc_state = ESnormal;
1559         if (ch == 'n' && !tp->esc_ques) {
1560                 if (tp->esc_par[0] == 5)                /* Status report. */
1561                         kbd_puts_queue(&tp->port, "\033[0n");
1562                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1563                         char buf[40];
1564                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1565                         kbd_puts_queue(&tp->port, buf);
1566                 }
1567                 return;
1568         }
1569         if (tp->esc_ques)
1570                 return;
1571         switch (ch) {
1572         case 'm':
1573                 tty3270_set_attributes(tp);
1574                 break;
1575         case 'H':       /* Set cursor position. */
1576         case 'f':
1577                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1578                                 tty3270_getpar(tp, 0) - 1);
1579                 break;
1580         case 'd':       /* Set y position. */
1581                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1582                 break;
1583         case 'A':       /* Cursor up. */
1584         case 'F':
1585                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1586                 break;
1587         case 'B':       /* Cursor down. */
1588         case 'e':
1589         case 'E':
1590                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1591                 break;
1592         case 'C':       /* Cursor forward. */
1593         case 'a':
1594                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1595                 break;
1596         case 'D':       /* Cursor backward. */
1597                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1598                 break;
1599         case 'G':       /* Set x position. */
1600         case '`':
1601                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1602                 break;
1603         case 'X':       /* Erase Characters. */
1604                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1605                 break;
1606         case 'J':       /* Erase display. */
1607                 tty3270_erase_display(tp, tp->esc_par[0]);
1608                 break;
1609         case 'K':       /* Erase line. */
1610                 tty3270_erase_line(tp, tp->esc_par[0]);
1611                 break;
1612         case 'P':       /* Delete characters. */
1613                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1614                 break;
1615         case '@':       /* Insert characters. */
1616                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1617                 break;
1618         case 's':       /* Save cursor position. */
1619                 tp->saved_cx = tp->cx;
1620                 tp->saved_cy = tp->cy;
1621                 tp->saved_highlight = tp->highlight;
1622                 tp->saved_f_color = tp->f_color;
1623                 break;
1624         case 'u':       /* Restore cursor position. */
1625                 tty3270_convert_line(tp, tp->cy);
1626                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1627                 tp->highlight = tp->saved_highlight;
1628                 tp->f_color = tp->saved_f_color;
1629                 break;
1630         }
1631 }
1632
1633 /*
1634  * String write routine for 3270 ttys
1635  */
1636 static void
1637 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1638                 const unsigned char *buf, int count)
1639 {
1640         int i_msg, i;
1641
1642         spin_lock_bh(&tp->view.lock);
1643         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1644                 if (tp->esc_state != 0) {
1645                         /* Continue escape sequence. */
1646                         tty3270_escape_sequence(tp, buf[i_msg]);
1647                         continue;
1648                 }
1649
1650                 switch (buf[i_msg]) {
1651                 case 0x07:              /* '\a' -- Alarm */
1652                         tp->wcc |= TW_PLUSALARM;
1653                         break;
1654                 case 0x08:              /* Backspace. */
1655                         if (tp->cx > 0) {
1656                                 tp->cx--;
1657                                 tty3270_put_character(tp, ' ');
1658                         }
1659                         break;
1660                 case 0x09:              /* '\t' -- Tabulate */
1661                         for (i = tp->cx % 8; i < 8; i++) {
1662                                 if (tp->cx >= tp->view.cols) {
1663                                         tty3270_cr(tp);
1664                                         tty3270_lf(tp);
1665                                         break;
1666                                 }
1667                                 tty3270_put_character(tp, ' ');
1668                                 tp->cx++;
1669                         }
1670                         break;
1671                 case 0x0a:              /* '\n' -- New Line */
1672                         tty3270_cr(tp);
1673                         tty3270_lf(tp);
1674                         break;
1675                 case 0x0c:              /* '\f' -- Form Feed */
1676                         tty3270_erase_display(tp, 2);
1677                         tp->cx = tp->cy = 0;
1678                         break;
1679                 case 0x0d:              /* '\r' -- Carriage Return */
1680                         tp->cx = 0;
1681                         break;
1682                 case 0x0f:              /* SuSE "exit alternate mode" */
1683                         break;
1684                 case 0x1b:              /* Start escape sequence. */
1685                         tty3270_escape_sequence(tp, buf[i_msg]);
1686                         break;
1687                 default:                /* Insert normal character. */
1688                         if (tp->cx >= tp->view.cols) {
1689                                 tty3270_cr(tp);
1690                                 tty3270_lf(tp);
1691                         }
1692                         tty3270_put_character(tp, buf[i_msg]);
1693                         tp->cx++;
1694                         break;
1695                 }
1696         }
1697         /* Convert current line to 3270 data fragment. */
1698         tty3270_convert_line(tp, tp->cy);
1699
1700         /* Setup timer to update display after 1/10 second */
1701         if (!timer_pending(&tp->timer))
1702                 tty3270_set_timer(tp, HZ/10);
1703
1704         spin_unlock_bh(&tp->view.lock);
1705 }
1706
1707 /*
1708  * String write routine for 3270 ttys
1709  */
1710 static int
1711 tty3270_write(struct tty_struct * tty,
1712               const unsigned char *buf, int count)
1713 {
1714         struct tty3270 *tp;
1715
1716         tp = tty->driver_data;
1717         if (!tp)
1718                 return 0;
1719         if (tp->char_count > 0) {
1720                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1721                 tp->char_count = 0;
1722         }
1723         tty3270_do_write(tp, tty, buf, count);
1724         return count;
1725 }
1726
1727 /*
1728  * Put single characters to the ttys character buffer
1729  */
1730 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1731 {
1732         struct tty3270 *tp;
1733
1734         tp = tty->driver_data;
1735         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1736                 return 0;
1737         tp->char_buf[tp->char_count++] = ch;
1738         return 1;
1739 }
1740
1741 /*
1742  * Flush all characters from the ttys characeter buffer put there
1743  * by tty3270_put_char.
1744  */
1745 static void
1746 tty3270_flush_chars(struct tty_struct *tty)
1747 {
1748         struct tty3270 *tp;
1749
1750         tp = tty->driver_data;
1751         if (!tp)
1752                 return;
1753         if (tp->char_count > 0) {
1754                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1755                 tp->char_count = 0;
1756         }
1757 }
1758
1759 /*
1760  * Returns the number of characters in the output buffer. This is
1761  * used in tty_wait_until_sent to wait until all characters have
1762  * appeared on the screen.
1763  */
1764 static int
1765 tty3270_chars_in_buffer(struct tty_struct *tty)
1766 {
1767         return 0;
1768 }
1769
1770 static void
1771 tty3270_flush_buffer(struct tty_struct *tty)
1772 {
1773 }
1774
1775 /*
1776  * Check for visible/invisible input switches
1777  */
1778 static void
1779 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1780 {
1781         struct tty3270 *tp;
1782         int new;
1783
1784         tp = tty->driver_data;
1785         if (!tp)
1786                 return;
1787         spin_lock_bh(&tp->view.lock);
1788         if (L_ICANON(tty)) {
1789                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1790                 if (new != tp->inattr) {
1791                         tp->inattr = new;
1792                         tty3270_update_prompt(tp, NULL, 0);
1793                         tty3270_set_timer(tp, 1);
1794                 }
1795         }
1796         spin_unlock_bh(&tp->view.lock);
1797 }
1798
1799 /*
1800  * Disable reading from a 3270 tty
1801  */
1802 static void
1803 tty3270_throttle(struct tty_struct * tty)
1804 {
1805         struct tty3270 *tp;
1806
1807         tp = tty->driver_data;
1808         if (!tp)
1809                 return;
1810         tp->throttle = 1;
1811 }
1812
1813 /*
1814  * Enable reading from a 3270 tty
1815  */
1816 static void
1817 tty3270_unthrottle(struct tty_struct * tty)
1818 {
1819         struct tty3270 *tp;
1820
1821         tp = tty->driver_data;
1822         if (!tp)
1823                 return;
1824         tp->throttle = 0;
1825         if (tp->attn)
1826                 tty3270_issue_read(tp, 1);
1827 }
1828
1829 /*
1830  * Hang up the tty device.
1831  */
1832 static void
1833 tty3270_hangup(struct tty_struct *tty)
1834 {
1835         struct tty3270 *tp;
1836
1837         tp = tty->driver_data;
1838         if (!tp)
1839                 return;
1840         spin_lock_bh(&tp->view.lock);
1841         tp->cx = tp->saved_cx = 0;
1842         tp->cy = tp->saved_cy = 0;
1843         tp->highlight = tp->saved_highlight = TAX_RESET;
1844         tp->f_color = tp->saved_f_color = TAC_RESET;
1845         tty3270_blank_screen(tp);
1846         while (tp->nr_lines < tp->view.rows - 2)
1847                 tty3270_blank_line(tp);
1848         tp->update_flags = TTY_UPDATE_ALL;
1849         spin_unlock_bh(&tp->view.lock);
1850         tty3270_set_timer(tp, 1);
1851 }
1852
1853 static void
1854 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1855 {
1856 }
1857
1858 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1859                          unsigned long arg)
1860 {
1861         struct tty3270 *tp;
1862
1863         tp = tty->driver_data;
1864         if (!tp)
1865                 return -ENODEV;
1866         if (tty_io_error(tty))
1867                 return -EIO;
1868         return kbd_ioctl(tp->kbd, cmd, arg);
1869 }
1870
1871 #ifdef CONFIG_COMPAT
1872 static long tty3270_compat_ioctl(struct tty_struct *tty,
1873                                  unsigned int cmd, unsigned long arg)
1874 {
1875         struct tty3270 *tp;
1876
1877         tp = tty->driver_data;
1878         if (!tp)
1879                 return -ENODEV;
1880         if (tty_io_error(tty))
1881                 return -EIO;
1882         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1883 }
1884 #endif
1885
1886 static const struct tty_operations tty3270_ops = {
1887         .install = tty3270_install,
1888         .cleanup = tty3270_cleanup,
1889         .open = tty3270_open,
1890         .close = tty3270_close,
1891         .write = tty3270_write,
1892         .put_char = tty3270_put_char,
1893         .flush_chars = tty3270_flush_chars,
1894         .write_room = tty3270_write_room,
1895         .chars_in_buffer = tty3270_chars_in_buffer,
1896         .flush_buffer = tty3270_flush_buffer,
1897         .throttle = tty3270_throttle,
1898         .unthrottle = tty3270_unthrottle,
1899         .hangup = tty3270_hangup,
1900         .wait_until_sent = tty3270_wait_until_sent,
1901         .ioctl = tty3270_ioctl,
1902 #ifdef CONFIG_COMPAT
1903         .compat_ioctl = tty3270_compat_ioctl,
1904 #endif
1905         .set_termios = tty3270_set_termios
1906 };
1907
1908 static void tty3270_create_cb(int minor)
1909 {
1910         tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
1911 }
1912
1913 static void tty3270_destroy_cb(int minor)
1914 {
1915         tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
1916 }
1917
1918 static struct raw3270_notifier tty3270_notifier =
1919 {
1920         .create = tty3270_create_cb,
1921         .destroy = tty3270_destroy_cb,
1922 };
1923
1924 /*
1925  * 3270 tty registration code called from tty_init().
1926  * Most kernel services (incl. kmalloc) are available at this poimt.
1927  */
1928 static int __init tty3270_init(void)
1929 {
1930         struct tty_driver *driver;
1931         int ret;
1932
1933         driver = tty_alloc_driver(RAW3270_MAXDEVS,
1934                                   TTY_DRIVER_REAL_RAW |
1935                                   TTY_DRIVER_DYNAMIC_DEV |
1936                                   TTY_DRIVER_RESET_TERMIOS);
1937         if (IS_ERR(driver))
1938                 return PTR_ERR(driver);
1939
1940         /*
1941          * Initialize the tty_driver structure
1942          * Entries in tty3270_driver that are NOT initialized:
1943          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1944          */
1945         driver->driver_name = "tty3270";
1946         driver->name = "3270/tty";
1947         driver->major = IBM_TTY3270_MAJOR;
1948         driver->minor_start = RAW3270_FIRSTMINOR;
1949         driver->name_base = RAW3270_FIRSTMINOR;
1950         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1951         driver->subtype = SYSTEM_TYPE_TTY;
1952         driver->init_termios = tty_std_termios;
1953         tty_set_operations(driver, &tty3270_ops);
1954         ret = tty_register_driver(driver);
1955         if (ret) {
1956                 put_tty_driver(driver);
1957                 return ret;
1958         }
1959         tty3270_driver = driver;
1960         raw3270_register_notifier(&tty3270_notifier);
1961         return 0;
1962 }
1963
1964 static void __exit
1965 tty3270_exit(void)
1966 {
1967         struct tty_driver *driver;
1968
1969         raw3270_unregister_notifier(&tty3270_notifier);
1970         driver = tty3270_driver;
1971         tty3270_driver = NULL;
1972         tty_unregister_driver(driver);
1973         put_tty_driver(driver);
1974         tty3270_del_views();
1975 }
1976
1977 MODULE_LICENSE("GPL");
1978 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1979
1980 module_init(tty3270_init);
1981 module_exit(tty3270_exit);