bc33068b9ce2b3556bdc02ee0878ded5fb5233cc
[linux-2.6.git] / drivers / s390 / char / tty3270.c
1 /*
2  *  drivers/s390/char/tty3270.c
3  *    IBM/3270 Driver - tty functions.
4  *
5  *  Author(s):
6  *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
7  *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
8  *      -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
9  */
10
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kdev_t.h>
14 #include <linux/tty.h>
15 #include <linux/vt_kern.h>
16 #include <linux/init.h>
17 #include <linux/console.h>
18 #include <linux/interrupt.h>
19
20 #include <linux/slab.h>
21 #include <linux/bootmem.h>
22
23 #include <asm/ccwdev.h>
24 #include <asm/cio.h>
25 #include <asm/ebcdic.h>
26 #include <asm/uaccess.h>
27
28
29 #include "raw3270.h"
30 #include "keyboard.h"
31
32 #define TTY3270_CHAR_BUF_SIZE 256
33 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
34 #define TTY3270_STRING_PAGES 5
35
36 struct tty_driver *tty3270_driver;
37 static int tty3270_max_index;
38
39 static struct raw3270_fn tty3270_fn;
40
41 struct tty3270_cell {
42         unsigned char character;
43         unsigned char highlight;
44         unsigned char f_color;
45 };
46
47 struct tty3270_line {
48         struct tty3270_cell *cells;
49         int len;
50 };
51
52 #define ESCAPE_NPAR 8
53
54 /*
55  * The main tty view data structure.
56  * FIXME:
57  * 1) describe line orientation & lines list concept against screen
58  * 2) describe conversion of screen to lines
59  * 3) describe line format.
60  */
61 struct tty3270 {
62         struct raw3270_view view;
63         struct tty_struct *tty;         /* Pointer to tty structure */
64         void **freemem_pages;           /* Array of pages used for freemem. */
65         struct list_head freemem;       /* List of free memory for strings. */
66
67         /* Output stuff. */
68         struct list_head lines;         /* List of lines. */
69         struct list_head update;        /* List of lines to update. */
70         unsigned char wcc;              /* Write control character. */
71         int nr_lines;                   /* # lines in list. */
72         int nr_up;                      /* # lines up in history. */
73         unsigned long update_flags;     /* Update indication bits. */
74         struct string *status;          /* Lower right of display. */
75         struct raw3270_request *write;  /* Single write request. */
76         struct timer_list timer;        /* Output delay timer. */
77
78         /* Current tty screen. */
79         unsigned int cx, cy;            /* Current output position. */
80         unsigned int highlight;         /* Blink/reverse/underscore */
81         unsigned int f_color;           /* Foreground color */
82         struct tty3270_line *screen;
83
84         /* Input stuff. */
85         struct string *prompt;          /* Output string for input area. */
86         struct string *input;           /* Input string for read request. */
87         struct raw3270_request *read;   /* Single read request. */
88         struct raw3270_request *kreset; /* Single keyboard reset request. */
89         unsigned char inattr;           /* Visible/invisible input. */
90         int throttle, attn;             /* tty throttle/unthrottle. */
91         struct tasklet_struct readlet;  /* Tasklet to issue read request. */
92         struct kbd_data *kbd;           /* key_maps stuff. */
93
94         /* Escape sequence parsing. */
95         int esc_state, esc_ques, esc_npar;
96         int esc_par[ESCAPE_NPAR];
97         unsigned int saved_cx, saved_cy;
98         unsigned int saved_highlight, saved_f_color;
99
100         /* Command recalling. */
101         struct list_head rcl_lines;     /* List of recallable lines. */
102         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
103         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
104
105         /* Character array for put_char/flush_chars. */
106         unsigned int char_count;
107         char char_buf[TTY3270_CHAR_BUF_SIZE];
108 };
109
110 /* tty3270->update_flags. See tty3270_update for details. */
111 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
112 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
113 #define TTY_UPDATE_INPUT        4       /* Update input line. */
114 #define TTY_UPDATE_STATUS       8       /* Update status line. */
115 #define TTY_UPDATE_ALL          15
116
117 static void tty3270_update(struct tty3270 *);
118
119 /*
120  * Setup timeout for a device. On timeout trigger an update.
121  */
122 static void tty3270_set_timer(struct tty3270 *tp, int expires)
123 {
124         if (expires == 0) {
125                 if (timer_pending(&tp->timer) && del_timer(&tp->timer))
126                         raw3270_put_view(&tp->view);
127                 return;
128         }
129         if (timer_pending(&tp->timer) &&
130             mod_timer(&tp->timer, jiffies + expires))
131                 return;
132         raw3270_get_view(&tp->view);
133         tp->timer.function = (void (*)(unsigned long)) tty3270_update;
134         tp->timer.data = (unsigned long) tp;
135         tp->timer.expires = jiffies + expires;
136         add_timer(&tp->timer);
137 }
138
139 /*
140  * The input line are the two last lines of the screen.
141  */
142 static void
143 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
144 {
145         struct string *line;
146         unsigned int off;
147
148         line = tp->prompt;
149         if (count != 0)
150                 line->string[5] = TF_INMDT;
151         else
152                 line->string[5] = tp->inattr;
153         if (count > tp->view.cols * 2 - 11)
154                 count = tp->view.cols * 2 - 11;
155         memcpy(line->string + 6, input, count);
156         line->string[6 + count] = TO_IC;
157         /* Clear to end of input line. */
158         if (count < tp->view.cols * 2 - 11) {
159                 line->string[7 + count] = TO_RA;
160                 line->string[10 + count] = 0;
161                 off = tp->view.cols * tp->view.rows - 9;
162                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
163                 line->len = 11 + count;
164         } else
165                 line->len = 7 + count;
166         tp->update_flags |= TTY_UPDATE_INPUT;
167 }
168
169 static void
170 tty3270_create_prompt(struct tty3270 *tp)
171 {
172         static const unsigned char blueprint[] =
173                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
174                   /* empty input string */
175                   TO_IC, TO_RA, 0, 0, 0 };
176         struct string *line;
177         unsigned int offset;
178
179         line = alloc_string(&tp->freemem,
180                             sizeof(blueprint) + tp->view.cols * 2 - 9);
181         tp->prompt = line;
182         tp->inattr = TF_INPUT;
183         /* Copy blueprint to status line */
184         memcpy(line->string, blueprint, sizeof(blueprint));
185         line->len = sizeof(blueprint);
186         /* Set output offsets. */
187         offset = tp->view.cols * (tp->view.rows - 2);
188         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
189         offset = tp->view.cols * tp->view.rows - 9;
190         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
191
192         /* Allocate input string for reading. */
193         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
194 }
195
196 /*
197  * The status line is the last line of the screen. It shows the string
198  * "Running"/"Holding" in the lower right corner of the screen.
199  */
200 static void
201 tty3270_update_status(struct tty3270 * tp)
202 {
203         char *str;
204
205         str = (tp->nr_up != 0) ? "History" : "Running";
206         memcpy(tp->status->string + 8, str, 7);
207         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
208         tp->update_flags |= TTY_UPDATE_STATUS;
209 }
210
211 static void
212 tty3270_create_status(struct tty3270 * tp)
213 {
214         static const unsigned char blueprint[] =
215                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
216                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
217                   TAC_RESET };
218         struct string *line;
219         unsigned int offset;
220
221         line = alloc_string(&tp->freemem,sizeof(blueprint));
222         tp->status = line;
223         /* Copy blueprint to status line */
224         memcpy(line->string, blueprint, sizeof(blueprint));
225         /* Set address to start of status string (= last 9 characters). */
226         offset = tp->view.cols * tp->view.rows - 9;
227         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
228 }
229
230 /*
231  * Set output offsets to 3270 datastream fragment of a tty string.
232  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
233  */
234 static void
235 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
236 {
237         unsigned char *cp;
238
239         raw3270_buffer_address(tp->view.dev, line->string + 1,
240                                tp->view.cols * nr);
241         cp = line->string + line->len - 4;
242         if (*cp == TO_RA)
243                 raw3270_buffer_address(tp->view.dev, cp + 1,
244                                        tp->view.cols * (nr + 1));
245 }
246
247 /*
248  * Rebuild update list to print all lines.
249  */
250 static void
251 tty3270_rebuild_update(struct tty3270 *tp)
252 {
253         struct string *s, *n;
254         int line, nr_up;
255
256         /* 
257          * Throw away update list and create a new one,
258          * containing all lines that will fit on the screen.
259          */
260         list_for_each_entry_safe(s, n, &tp->update, update)
261                 list_del_init(&s->update);
262         line = tp->view.rows - 3;
263         nr_up = tp->nr_up;
264         list_for_each_entry_reverse(s, &tp->lines, list) {
265                 if (nr_up > 0) {
266                         nr_up--;
267                         continue;
268                 }
269                 tty3270_update_string(tp, s, line);
270                 list_add(&s->update, &tp->update);
271                 if (--line < 0)
272                         break;
273         }
274         tp->update_flags |= TTY_UPDATE_LIST;
275 }
276
277 /*
278  * Alloc string for size bytes. If there is not enough room in
279  * freemem, free strings until there is room.
280  */
281 static struct string *
282 tty3270_alloc_string(struct tty3270 *tp, size_t size)
283 {
284         struct string *s, *n;
285
286         s = alloc_string(&tp->freemem, size);
287         if (s)
288                 return s;
289         list_for_each_entry_safe(s, n, &tp->lines, list) {
290                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
291                 list_del(&s->list);
292                 if (!list_empty(&s->update))
293                         list_del(&s->update);
294                 tp->nr_lines--;
295                 if (free_string(&tp->freemem, s) >= size)
296                         break;
297         }
298         s = alloc_string(&tp->freemem, size);
299         BUG_ON(!s);
300         if (tp->nr_up != 0 &&
301             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
302                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
303                 tty3270_rebuild_update(tp);
304                 tty3270_update_status(tp);
305         }
306         return s;
307 }
308
309 /*
310  * Add an empty line to the list.
311  */
312 static void
313 tty3270_blank_line(struct tty3270 *tp)
314 {
315         static const unsigned char blueprint[] =
316                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
317                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
318         struct string *s;
319
320         s = tty3270_alloc_string(tp, sizeof(blueprint));
321         memcpy(s->string, blueprint, sizeof(blueprint));
322         s->len = sizeof(blueprint);
323         list_add_tail(&s->list, &tp->lines);
324         tp->nr_lines++;
325         if (tp->nr_up != 0)
326                 tp->nr_up++;
327 }
328
329 /*
330  * Write request completion callback.
331  */
332 static void
333 tty3270_write_callback(struct raw3270_request *rq, void *data)
334 {
335         struct tty3270 *tp;
336
337         tp = (struct tty3270 *) rq->view;
338         if (rq->rc != 0) {
339                 /* Write wasn't successfull. Refresh all. */
340                 tty3270_rebuild_update(tp);
341                 tp->update_flags = TTY_UPDATE_ALL;
342                 tty3270_set_timer(tp, 1);
343         }
344         raw3270_request_reset(rq);
345         xchg(&tp->write, rq);
346 }
347
348 /*
349  * Update 3270 display.
350  */
351 static void
352 tty3270_update(struct tty3270 *tp)
353 {
354         static char invalid_sba[2] = { 0xff, 0xff };
355         struct raw3270_request *wrq;
356         unsigned long updated;
357         struct string *s, *n;
358         char *sba, *str;
359         int rc, len;
360
361         wrq = xchg(&tp->write, 0);
362         if (!wrq) {
363                 tty3270_set_timer(tp, 1);
364                 return;
365         }
366
367         spin_lock(&tp->view.lock);
368         updated = 0;
369         if (tp->update_flags & TTY_UPDATE_ERASE) {
370                 /* Use erase write alternate to erase display. */
371                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
372                 updated |= TTY_UPDATE_ERASE;
373         } else
374                 raw3270_request_set_cmd(wrq, TC_WRITE);
375
376         raw3270_request_add_data(wrq, &tp->wcc, 1);
377         tp->wcc = TW_NONE;
378
379         /*
380          * Update status line.
381          */
382         if (tp->update_flags & TTY_UPDATE_STATUS)
383                 if (raw3270_request_add_data(wrq, tp->status->string,
384                                              tp->status->len) == 0)
385                         updated |= TTY_UPDATE_STATUS;
386
387         /*
388          * Write input line.
389          */
390         if (tp->update_flags & TTY_UPDATE_INPUT)
391                 if (raw3270_request_add_data(wrq, tp->prompt->string,
392                                              tp->prompt->len) == 0)
393                         updated |= TTY_UPDATE_INPUT;
394
395         sba = invalid_sba;
396         
397         if (tp->update_flags & TTY_UPDATE_LIST) {
398                 /* Write strings in the update list to the screen. */
399                 list_for_each_entry_safe(s, n, &tp->update, update) {
400                         str = s->string;
401                         len = s->len;
402                         /*
403                          * Skip TO_SBA at the start of the string if the
404                          * last output position matches the start address
405                          * of this line.
406                          */
407                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
408                                 str += 3, len -= 3;
409                         if (raw3270_request_add_data(wrq, str, len) != 0)
410                                 break;
411                         list_del_init(&s->update);
412                         sba = s->string + s->len - 3;
413                 }
414                 if (list_empty(&tp->update))
415                         updated |= TTY_UPDATE_LIST;
416         }
417         wrq->callback = tty3270_write_callback;
418         rc = raw3270_start(&tp->view, wrq);
419         if (rc == 0) {
420                 tp->update_flags &= ~updated;
421                 if (tp->update_flags)
422                         tty3270_set_timer(tp, 1);
423         } else {
424                 raw3270_request_reset(wrq);
425                 xchg(&tp->write, wrq);
426         }
427         spin_unlock(&tp->view.lock);
428         raw3270_put_view(&tp->view);
429 }
430
431 /*
432  * Command recalling.
433  */
434 static void
435 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
436 {
437         struct string *s;
438
439         tp->rcl_walk = NULL;
440         if (len <= 0)
441                 return;
442         if (tp->rcl_nr >= tp->rcl_max) {
443                 s = list_entry(tp->rcl_lines.next, struct string, list);
444                 list_del(&s->list);
445                 free_string(&tp->freemem, s);
446                 tp->rcl_nr--;
447         }
448         s = tty3270_alloc_string(tp, len);
449         memcpy(s->string, input, len);
450         list_add_tail(&s->list, &tp->rcl_lines);
451         tp->rcl_nr++;
452 }
453
454 static void
455 tty3270_rcl_backward(struct kbd_data *kbd)
456 {
457         struct tty3270 *tp;
458         struct string *s;
459
460         tp = kbd->tty->driver_data;
461         spin_lock_bh(&tp->view.lock);
462         if (tp->inattr == TF_INPUT) {
463                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
464                         tp->rcl_walk = tp->rcl_walk->prev;
465                 else if (!list_empty(&tp->rcl_lines))
466                         tp->rcl_walk = tp->rcl_lines.prev;
467                 s = tp->rcl_walk ? 
468                         list_entry(tp->rcl_walk, struct string, list) : NULL;
469                 if (tp->rcl_walk) {
470                         s = list_entry(tp->rcl_walk, struct string, list);
471                         tty3270_update_prompt(tp, s->string, s->len);
472                 } else
473                         tty3270_update_prompt(tp, NULL, 0);
474                 tty3270_set_timer(tp, 1);
475         }
476         spin_unlock_bh(&tp->view.lock);
477 }
478
479 /*
480  * Deactivate tty view.
481  */
482 static void
483 tty3270_exit_tty(struct kbd_data *kbd)
484 {
485         struct tty3270 *tp;
486
487         tp = kbd->tty->driver_data;
488         raw3270_deactivate_view(&tp->view);
489 }
490
491 /*
492  * Scroll forward in history.
493  */
494 static void
495 tty3270_scroll_forward(struct kbd_data *kbd)
496 {
497         struct tty3270 *tp;
498         int nr_up;
499
500         tp = kbd->tty->driver_data;
501         spin_lock_bh(&tp->view.lock);
502         nr_up = tp->nr_up - tp->view.rows + 2;
503         if (nr_up < 0)
504                 nr_up = 0;
505         if (nr_up != tp->nr_up) {
506                 tp->nr_up = nr_up;
507                 tty3270_rebuild_update(tp);
508                 tty3270_update_status(tp);
509                 tty3270_set_timer(tp, 1);
510         }
511         spin_unlock_bh(&tp->view.lock);
512 }
513
514 /*
515  * Scroll backward in history.
516  */
517 static void
518 tty3270_scroll_backward(struct kbd_data *kbd)
519 {
520         struct tty3270 *tp;
521         int nr_up;
522
523         tp = kbd->tty->driver_data;
524         spin_lock_bh(&tp->view.lock);
525         nr_up = tp->nr_up + tp->view.rows - 2;
526         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
527                 nr_up = tp->nr_lines - tp->view.rows + 2;
528         if (nr_up != tp->nr_up) {
529                 tp->nr_up = nr_up;
530                 tty3270_rebuild_update(tp);
531                 tty3270_update_status(tp);
532                 tty3270_set_timer(tp, 1);
533         }
534         spin_unlock_bh(&tp->view.lock);
535 }
536
537 /*
538  * Pass input line to tty.
539  */
540 static void
541 tty3270_read_tasklet(struct raw3270_request *rrq)
542 {
543         static char kreset_data = TW_KR;
544         struct tty3270 *tp;
545         char *input;
546         int len;
547
548         tp = (struct tty3270 *) rrq->view;
549         spin_lock_bh(&tp->view.lock);
550         /*
551          * Two AID keys are special: For 0x7d (enter) the input line
552          * has to be emitted to the tty and for 0x6d the screen
553          * needs to be redrawn.
554          */
555         input = NULL;
556         len = 0;
557         if (tp->input->string[0] == 0x7d) {
558                 /* Enter: write input to tty. */
559                 input = tp->input->string + 6;
560                 len = tp->input->len - 6 - rrq->rescnt;
561                 if (tp->inattr != TF_INPUTN)
562                         tty3270_rcl_add(tp, input, len);
563                 if (tp->nr_up > 0) {
564                         tp->nr_up = 0;
565                         tty3270_rebuild_update(tp);
566                         tty3270_update_status(tp);
567                 }
568                 /* Clear input area. */
569                 tty3270_update_prompt(tp, NULL, 0);
570                 tty3270_set_timer(tp, 1);
571         } else if (tp->input->string[0] == 0x6d) {
572                 /* Display has been cleared. Redraw. */
573                 tty3270_rebuild_update(tp);
574                 tp->update_flags = TTY_UPDATE_ALL;
575                 tty3270_set_timer(tp, 1);
576         }
577         spin_unlock_bh(&tp->view.lock);
578
579         /* Start keyboard reset command. */
580         raw3270_request_reset(tp->kreset);
581         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
582         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
583         raw3270_start(&tp->view, tp->kreset);
584
585         /* Emit input string. */
586         if (tp->tty) {
587                 while (len-- > 0)
588                         kbd_keycode(tp->kbd, *input++);
589                 /* Emit keycode for AID byte. */
590                 kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
591         }
592
593         raw3270_request_reset(rrq);
594         xchg(&tp->read, rrq);
595         raw3270_put_view(&tp->view);
596 }
597
598 /*
599  * Read request completion callback.
600  */
601 static void
602 tty3270_read_callback(struct raw3270_request *rq, void *data)
603 {
604         raw3270_get_view(rq->view);
605         /* Schedule tasklet to pass input to tty. */
606         tasklet_schedule(&((struct tty3270 *) rq->view)->readlet);
607 }
608
609 /*
610  * Issue a read request. Call with device lock.
611  */
612 static void
613 tty3270_issue_read(struct tty3270 *tp, int lock)
614 {
615         struct raw3270_request *rrq;
616         int rc;
617
618         rrq = xchg(&tp->read, 0);
619         if (!rrq)
620                 /* Read already scheduled. */
621                 return;
622         rrq->callback = tty3270_read_callback;
623         rrq->callback_data = tp;
624         raw3270_request_set_cmd(rrq, TC_READMOD);
625         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
626         /* Issue the read modified request. */
627         if (lock) {
628                 rc = raw3270_start(&tp->view, rrq);
629         } else
630                 rc = raw3270_start_irq(&tp->view, rrq);
631         if (rc) {
632                 raw3270_request_reset(rrq);
633                 xchg(&tp->read, rrq);
634         }
635 }
636
637 /*
638  * Switch to the tty view.
639  */
640 static int
641 tty3270_activate(struct raw3270_view *view)
642 {
643         struct tty3270 *tp;
644         unsigned long flags;
645
646         tp = (struct tty3270 *) view;
647         spin_lock_irqsave(&tp->view.lock, flags);
648         tp->nr_up = 0;
649         tty3270_rebuild_update(tp);
650         tty3270_update_status(tp);
651         tp->update_flags = TTY_UPDATE_ALL;
652         tty3270_set_timer(tp, 1);
653         spin_unlock_irqrestore(&tp->view.lock, flags);
654         return 0;
655 }
656
657 static void
658 tty3270_deactivate(struct raw3270_view *view)
659 {
660 }
661
662 static int
663 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
664 {
665         /* Handle ATTN. Schedule tasklet to read aid. */
666         if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
667                 if (!tp->throttle)
668                         tty3270_issue_read(tp, 0);
669                 else
670                         tp->attn = 1;
671         }
672
673         if (rq) {
674                 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
675                         rq->rc = -EIO;
676                 else
677                         /* Normal end. Copy residual count. */
678                         rq->rescnt = irb->scsw.count;
679         }
680         return RAW3270_IO_DONE;
681 }
682
683 /*
684  * Allocate tty3270 structure.
685  */
686 static struct tty3270 *
687 tty3270_alloc_view(void)
688 {
689         struct tty3270 *tp;
690         int pages;
691
692         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
693         if (!tp)
694                 goto out_err;
695         tp->freemem_pages =
696                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
697         if (!tp->freemem_pages)
698                 goto out_tp;
699         INIT_LIST_HEAD(&tp->freemem);
700         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
701                 tp->freemem_pages[pages] = (void *)
702                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
703                 if (!tp->freemem_pages[pages])
704                         goto out_pages;
705                 add_string_memory(&tp->freemem,
706                                   tp->freemem_pages[pages], PAGE_SIZE);
707         }
708         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
709         if (IS_ERR(tp->write))
710                 goto out_pages;
711         tp->read = raw3270_request_alloc(0);
712         if (IS_ERR(tp->read))
713                 goto out_write;
714         tp->kreset = raw3270_request_alloc(1);
715         if (IS_ERR(tp->kreset))
716                 goto out_read;
717         tp->kbd = kbd_alloc();
718         if (!tp->kbd)
719                 goto out_reset;
720         return tp;
721
722 out_reset:
723         raw3270_request_free(tp->kreset);
724 out_read:
725         raw3270_request_free(tp->read);
726 out_write:
727         raw3270_request_free(tp->write);
728 out_pages:
729         while (pages--)
730                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
731         kfree(tp->freemem_pages);
732 out_tp:
733         kfree(tp);
734 out_err:
735         return ERR_PTR(-ENOMEM);
736 }
737
738 /*
739  * Free tty3270 structure.
740  */
741 static void
742 tty3270_free_view(struct tty3270 *tp)
743 {
744         int pages;
745
746         kbd_free(tp->kbd);
747         raw3270_request_free(tp->kreset);
748         raw3270_request_free(tp->read);
749         raw3270_request_free(tp->write);
750         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
751                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
752         kfree(tp->freemem_pages);
753         kfree(tp);
754 }
755
756 /*
757  * Allocate tty3270 screen.
758  */
759 static int
760 tty3270_alloc_screen(struct tty3270 *tp)
761 {
762         unsigned long size;
763         int lines;
764
765         size = sizeof(struct tty3270_line) * (tp->view.rows - 2);
766         tp->screen = kzalloc(size, GFP_KERNEL);
767         if (!tp->screen)
768                 goto out_err;
769         for (lines = 0; lines < tp->view.rows - 2; lines++) {
770                 size = sizeof(struct tty3270_cell) * tp->view.cols;
771                 tp->screen[lines].cells = kzalloc(size, GFP_KERNEL);
772                 if (!tp->screen[lines].cells)
773                         goto out_screen;
774         }
775         return 0;
776 out_screen:
777         while (lines--)
778                 kfree(tp->screen[lines].cells);
779         kfree(tp->screen);
780 out_err:
781         return -ENOMEM;
782 }
783
784 /*
785  * Free tty3270 screen.
786  */
787 static void
788 tty3270_free_screen(struct tty3270 *tp)
789 {
790         int lines;
791
792         for (lines = 0; lines < tp->view.rows - 2; lines++)
793                 kfree(tp->screen[lines].cells);
794         kfree(tp->screen);
795 }
796
797 /*
798  * Unlink tty3270 data structure from tty.
799  */
800 static void
801 tty3270_release(struct raw3270_view *view)
802 {
803         struct tty3270 *tp;
804         struct tty_struct *tty;
805
806         tp = (struct tty3270 *) view;
807         tty = tp->tty;
808         if (tty) {
809                 tty->driver_data = NULL;
810                 tp->tty = tp->kbd->tty = NULL;
811                 tty_hangup(tty);
812                 raw3270_put_view(&tp->view);
813         }
814 }
815
816 /*
817  * Free tty3270 data structure
818  */
819 static void
820 tty3270_free(struct raw3270_view *view)
821 {
822         tty3270_free_screen((struct tty3270 *) view);
823         tty3270_free_view((struct tty3270 *) view);
824 }
825
826 /*
827  * Delayed freeing of tty3270 views.
828  */
829 static void
830 tty3270_del_views(void)
831 {
832         struct tty3270 *tp;
833         int i;
834
835         for (i = 0; i < tty3270_max_index; i++) {
836                 tp = (struct tty3270 *)
837                         raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
838                 if (!IS_ERR(tp))
839                         raw3270_del_view(&tp->view);
840         }
841 }
842
843 static struct raw3270_fn tty3270_fn = {
844         .activate = tty3270_activate,
845         .deactivate = tty3270_deactivate,
846         .intv = (void *) tty3270_irq,
847         .release = tty3270_release,
848         .free = tty3270_free
849 };
850
851 /*
852  * This routine is called whenever a 3270 tty is opened.
853  */
854 static int
855 tty3270_open(struct tty_struct *tty, struct file * filp)
856 {
857         struct tty3270 *tp;
858         int i, rc;
859
860         if (tty->count > 1)
861                 return 0;
862         /* Check if the tty3270 is already there. */
863         tp = (struct tty3270 *)
864                 raw3270_find_view(&tty3270_fn,
865                                   tty->index + RAW3270_FIRSTMINOR);
866         if (!IS_ERR(tp)) {
867                 tty->driver_data = tp;
868                 tty->winsize.ws_row = tp->view.rows - 2;
869                 tty->winsize.ws_col = tp->view.cols;
870                 tty->low_latency = 0;
871                 tp->tty = tty;
872                 tp->kbd->tty = tty;
873                 tp->inattr = TF_INPUT;
874                 return 0;
875         }
876         if (tty3270_max_index < tty->index + 1)
877                 tty3270_max_index = tty->index + 1;
878
879         /* Quick exit if there is no device for tty->index. */
880         if (PTR_ERR(tp) == -ENODEV)
881                 return -ENODEV;
882
883         /* Allocate tty3270 structure on first open. */
884         tp = tty3270_alloc_view();
885         if (IS_ERR(tp))
886                 return PTR_ERR(tp);
887
888         INIT_LIST_HEAD(&tp->lines);
889         INIT_LIST_HEAD(&tp->update);
890         INIT_LIST_HEAD(&tp->rcl_lines);
891         tp->rcl_max = 20;
892         init_timer(&tp->timer);
893         tasklet_init(&tp->readlet, 
894                      (void (*)(unsigned long)) tty3270_read_tasklet,
895                      (unsigned long) tp->read);
896
897         rc = raw3270_add_view(&tp->view, &tty3270_fn,
898                               tty->index + RAW3270_FIRSTMINOR);
899         if (rc) {
900                 tty3270_free_view(tp);
901                 return rc;
902         }
903
904         rc = tty3270_alloc_screen(tp);
905         if (rc) {
906                 raw3270_put_view(&tp->view);
907                 raw3270_del_view(&tp->view);
908                 return rc;
909         }
910
911         tp->tty = tty;
912         tty->low_latency = 0;
913         tty->driver_data = tp;
914         tty->winsize.ws_row = tp->view.rows - 2;
915         tty->winsize.ws_col = tp->view.cols;
916
917         tty3270_create_prompt(tp);
918         tty3270_create_status(tp);
919         tty3270_update_status(tp);
920
921         /* Create blank line for every line in the tty output area. */
922         for (i = 0; i < tp->view.rows - 2; i++)
923                 tty3270_blank_line(tp);
924
925         tp->kbd->tty = tty;
926         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
927         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
928         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
929         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
930         kbd_ascebc(tp->kbd, tp->view.ascebc);
931
932         raw3270_activate_view(&tp->view);
933         return 0;
934 }
935
936 /*
937  * This routine is called when the 3270 tty is closed. We wait
938  * for the remaining request to be completed. Then we clean up.
939  */
940 static void
941 tty3270_close(struct tty_struct *tty, struct file * filp)
942 {
943         struct tty3270 *tp;
944
945         if (tty->count > 1)
946                 return;
947         tp = (struct tty3270 *) tty->driver_data;
948         if (tp) {
949                 tty->driver_data = NULL;
950                 tp->tty = tp->kbd->tty = NULL;
951                 raw3270_put_view(&tp->view);
952         }
953 }
954
955 /*
956  * We always have room.
957  */
958 static int
959 tty3270_write_room(struct tty_struct *tty)
960 {
961         return INT_MAX;
962 }
963
964 /*
965  * Insert character into the screen at the current position with the
966  * current color and highlight. This function does NOT do cursor movement.
967  */
968 static void
969 tty3270_put_character(struct tty3270 *tp, char ch)
970 {
971         struct tty3270_line *line;
972         struct tty3270_cell *cell;
973
974         line = tp->screen + tp->cy;
975         if (line->len <= tp->cx) {
976                 while (line->len < tp->cx) {
977                         cell = line->cells + line->len;
978                         cell->character = tp->view.ascebc[' '];
979                         cell->highlight = tp->highlight;
980                         cell->f_color = tp->f_color;
981                         line->len++;
982                 }
983                 line->len++;
984         }
985         cell = line->cells + tp->cx;
986         cell->character = tp->view.ascebc[(unsigned int) ch];
987         cell->highlight = tp->highlight;
988         cell->f_color = tp->f_color;
989 }
990
991 /*
992  * Convert a tty3270_line to a 3270 data fragment usable for output.
993  */
994 static void
995 tty3270_convert_line(struct tty3270 *tp, int line_nr)
996 {
997         struct tty3270_line *line;
998         struct tty3270_cell *cell;
999         struct string *s, *n;
1000         unsigned char highlight;
1001         unsigned char f_color;
1002         char *cp;
1003         int flen, i;
1004
1005         /* Determine how long the fragment will be. */
1006         flen = 3;               /* Prefix (TO_SBA). */
1007         line = tp->screen + line_nr;
1008         flen += line->len;
1009         highlight = TAX_RESET;
1010         f_color = TAC_RESET;
1011         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1012                 if (cell->highlight != highlight) {
1013                         flen += 3;      /* TO_SA to switch highlight. */
1014                         highlight = cell->highlight;
1015                 }
1016                 if (cell->f_color != f_color) {
1017                         flen += 3;      /* TO_SA to switch color. */
1018                         f_color = cell->f_color;
1019                 }
1020         }
1021         if (highlight != TAX_RESET)
1022                 flen += 3;      /* TO_SA to reset hightlight. */
1023         if (f_color != TAC_RESET)
1024                 flen += 3;      /* TO_SA to reset color. */
1025         if (line->len < tp->view.cols)
1026                 flen += 4;      /* Postfix (TO_RA). */
1027
1028         /* Find the line in the list. */
1029         i = tp->view.rows - 2 - line_nr;
1030         list_for_each_entry_reverse(s, &tp->lines, list)
1031                 if (--i <= 0)
1032                         break;
1033         /*
1034          * Check if the line needs to get reallocated.
1035          */
1036         if (s->len != flen) {
1037                 /* Reallocate string. */
1038                 n = tty3270_alloc_string(tp, flen);
1039                 list_add(&n->list, &s->list);
1040                 list_del_init(&s->list);
1041                 if (!list_empty(&s->update))
1042                         list_del_init(&s->update);
1043                 free_string(&tp->freemem, s);
1044                 s = n;
1045         }
1046
1047         /* Write 3270 data fragment. */
1048         cp = s->string;
1049         *cp++ = TO_SBA;
1050         *cp++ = 0;
1051         *cp++ = 0;
1052
1053         highlight = TAX_RESET;
1054         f_color = TAC_RESET;
1055         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1056                 if (cell->highlight != highlight) {
1057                         *cp++ = TO_SA;
1058                         *cp++ = TAT_EXTHI;
1059                         *cp++ = cell->highlight;
1060                         highlight = cell->highlight;
1061                 }
1062                 if (cell->f_color != f_color) {
1063                         *cp++ = TO_SA;
1064                         *cp++ = TAT_COLOR;
1065                         *cp++ = cell->f_color;
1066                         f_color = cell->f_color;
1067                 }
1068                 *cp++ = cell->character;
1069         }
1070         if (highlight != TAX_RESET) {
1071                 *cp++ = TO_SA;
1072                 *cp++ = TAT_EXTHI;
1073                 *cp++ = TAX_RESET;
1074         }
1075         if (f_color != TAC_RESET) {
1076                 *cp++ = TO_SA;
1077                 *cp++ = TAT_COLOR;
1078                 *cp++ = TAC_RESET;
1079         }
1080         if (line->len < tp->view.cols) {
1081                 *cp++ = TO_RA;
1082                 *cp++ = 0;
1083                 *cp++ = 0;
1084                 *cp++ = 0;
1085         }
1086
1087         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1088                 /* Line is currently visible on screen. */
1089                 tty3270_update_string(tp, s, line_nr);
1090                 /* Add line to update list. */
1091                 if (list_empty(&s->update)) {
1092                         list_add_tail(&s->update, &tp->update);
1093                         tp->update_flags |= TTY_UPDATE_LIST;
1094                 }
1095         }
1096 }
1097
1098 /*
1099  * Do carriage return.
1100  */
1101 static void
1102 tty3270_cr(struct tty3270 *tp)
1103 {
1104         tp->cx = 0;
1105 }
1106
1107 /*
1108  * Do line feed.
1109  */
1110 static void
1111 tty3270_lf(struct tty3270 *tp)
1112 {
1113         struct tty3270_line temp;
1114         int i;
1115
1116         tty3270_convert_line(tp, tp->cy);
1117         if (tp->cy < tp->view.rows - 3) {
1118                 tp->cy++;
1119                 return;
1120         }
1121         /* Last line just filled up. Add new, blank line. */
1122         tty3270_blank_line(tp);
1123         temp = tp->screen[0];
1124         temp.len = 0;
1125         for (i = 0; i < tp->view.rows - 3; i++)
1126                 tp->screen[i] = tp->screen[i+1];
1127         tp->screen[tp->view.rows - 3] = temp;
1128         tty3270_rebuild_update(tp);
1129 }
1130
1131 static void
1132 tty3270_ri(struct tty3270 *tp)
1133 {
1134         if (tp->cy > 0) {
1135             tty3270_convert_line(tp, tp->cy);
1136             tp->cy--;
1137         }
1138 }
1139
1140 /*
1141  * Insert characters at current position.
1142  */
1143 static void
1144 tty3270_insert_characters(struct tty3270 *tp, int n)
1145 {
1146         struct tty3270_line *line;
1147         int k;
1148
1149         line = tp->screen + tp->cy;
1150         while (line->len < tp->cx) {
1151                 line->cells[line->len].character = tp->view.ascebc[' '];
1152                 line->cells[line->len].highlight = TAX_RESET;
1153                 line->cells[line->len].f_color = TAC_RESET;
1154                 line->len++;
1155         }
1156         if (n > tp->view.cols - tp->cx)
1157                 n = tp->view.cols - tp->cx;
1158         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1159         while (k--)
1160                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1161         line->len += n;
1162         if (line->len > tp->view.cols)
1163                 line->len = tp->view.cols;
1164         while (n-- > 0) {
1165                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1166                 line->cells[tp->cx + n].highlight = tp->highlight;
1167                 line->cells[tp->cx + n].f_color = tp->f_color;
1168         }
1169 }
1170
1171 /*
1172  * Delete characters at current position.
1173  */
1174 static void
1175 tty3270_delete_characters(struct tty3270 *tp, int n)
1176 {
1177         struct tty3270_line *line;
1178         int i;
1179
1180         line = tp->screen + tp->cy;
1181         if (line->len <= tp->cx)
1182                 return;
1183         if (line->len - tp->cx <= n) {
1184                 line->len = tp->cx;
1185                 return;
1186         }
1187         for (i = tp->cx; i + n < line->len; i++)
1188                 line->cells[i] = line->cells[i + n];
1189         line->len -= n;
1190 }
1191
1192 /*
1193  * Erase characters at current position.
1194  */
1195 static void
1196 tty3270_erase_characters(struct tty3270 *tp, int n)
1197 {
1198         struct tty3270_line *line;
1199         struct tty3270_cell *cell;
1200
1201         line = tp->screen + tp->cy;
1202         while (line->len > tp->cx && n-- > 0) {
1203                 cell = line->cells + tp->cx++;
1204                 cell->character = ' ';
1205                 cell->highlight = TAX_RESET;
1206                 cell->f_color = TAC_RESET;
1207         }
1208         tp->cx += n;
1209         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1210 }
1211
1212 /*
1213  * Erase line, 3 different cases:
1214  *  Esc [ 0 K   Erase from current position to end of line inclusive
1215  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1216  *  Esc [ 2 K   Erase entire line (without moving cursor)
1217  */
1218 static void
1219 tty3270_erase_line(struct tty3270 *tp, int mode)
1220 {
1221         struct tty3270_line *line;
1222         struct tty3270_cell *cell;
1223         int i;
1224
1225         line = tp->screen + tp->cy;
1226         if (mode == 0)
1227                 line->len = tp->cx;
1228         else if (mode == 1) {
1229                 for (i = 0; i < tp->cx; i++) {
1230                         cell = line->cells + i;
1231                         cell->character = ' ';
1232                         cell->highlight = TAX_RESET;
1233                         cell->f_color = TAC_RESET;
1234                 }
1235                 if (line->len <= tp->cx)
1236                         line->len = tp->cx + 1;
1237         } else if (mode == 2)
1238                 line->len = 0;
1239         tty3270_convert_line(tp, tp->cy);
1240 }
1241
1242 /*
1243  * Erase display, 3 different cases:
1244  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1245  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1246  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1247  */
1248 static void
1249 tty3270_erase_display(struct tty3270 *tp, int mode)
1250 {
1251         int i;
1252
1253         if (mode == 0) {
1254                 tty3270_erase_line(tp, 0);
1255                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1256                         tp->screen[i].len = 0;
1257                         tty3270_convert_line(tp, i);
1258                 }
1259         } else if (mode == 1) {
1260                 for (i = 0; i < tp->cy; i++) {
1261                         tp->screen[i].len = 0;
1262                         tty3270_convert_line(tp, i);
1263                 }
1264                 tty3270_erase_line(tp, 1);
1265         } else if (mode == 2) {
1266                 for (i = 0; i < tp->view.rows - 2; i++) {
1267                         tp->screen[i].len = 0;
1268                         tty3270_convert_line(tp, i);
1269                 }
1270         }
1271         tty3270_rebuild_update(tp);
1272 }
1273
1274 /*
1275  * Set attributes found in an escape sequence.
1276  *  Esc [ <attr> ; <attr> ; ... m
1277  */
1278 static void
1279 tty3270_set_attributes(struct tty3270 *tp)
1280 {
1281         static unsigned char f_colors[] = {
1282                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1283                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1284         };
1285         int i, attr;
1286
1287         for (i = 0; i <= tp->esc_npar; i++) {
1288                 attr = tp->esc_par[i];
1289                 switch (attr) {
1290                 case 0:         /* Reset */
1291                         tp->highlight = TAX_RESET;
1292                         tp->f_color = TAC_RESET;
1293                         break;
1294                 /* Highlight. */
1295                 case 4:         /* Start underlining. */
1296                         tp->highlight = TAX_UNDER;
1297                         break;
1298                 case 5:         /* Start blink. */
1299                         tp->highlight = TAX_BLINK;
1300                         break;
1301                 case 7:         /* Start reverse. */
1302                         tp->highlight = TAX_REVER;
1303                         break;
1304                 case 24:        /* End underlining */
1305                         if (tp->highlight == TAX_UNDER)
1306                                 tp->highlight = TAX_RESET;
1307                         break;
1308                 case 25:        /* End blink. */
1309                         if (tp->highlight == TAX_BLINK)
1310                                 tp->highlight = TAX_RESET;
1311                         break;
1312                 case 27:        /* End reverse. */
1313                         if (tp->highlight == TAX_REVER)
1314                                 tp->highlight = TAX_RESET;
1315                         break;
1316                 /* Foreground color. */
1317                 case 30:        /* Black */
1318                 case 31:        /* Red */
1319                 case 32:        /* Green */
1320                 case 33:        /* Yellow */
1321                 case 34:        /* Blue */
1322                 case 35:        /* Magenta */
1323                 case 36:        /* Cyan */
1324                 case 37:        /* White */
1325                 case 39:        /* Black */
1326                         tp->f_color = f_colors[attr - 30];
1327                         break;
1328                 }
1329         }
1330 }
1331
1332 static inline int
1333 tty3270_getpar(struct tty3270 *tp, int ix)
1334 {
1335         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1336 }
1337
1338 static void
1339 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1340 {
1341         tp->cx = min_t(int, tp->view.cols - 1, max_t(int, 0, cx));
1342         cy = min_t(int, tp->view.rows - 3, max_t(int, 0, cy));
1343         if (cy != tp->cy) {
1344                 tty3270_convert_line(tp, tp->cy);
1345                 tp->cy = cy;
1346         }
1347 }
1348
1349 /*
1350  * Process escape sequences. Known sequences:
1351  *  Esc 7                       Save Cursor Position
1352  *  Esc 8                       Restore Cursor Position
1353  *  Esc [ Pn ; Pn ; .. m        Set attributes
1354  *  Esc [ Pn ; Pn H             Cursor Position
1355  *  Esc [ Pn ; Pn f             Cursor Position
1356  *  Esc [ Pn A                  Cursor Up
1357  *  Esc [ Pn B                  Cursor Down
1358  *  Esc [ Pn C                  Cursor Forward
1359  *  Esc [ Pn D                  Cursor Backward
1360  *  Esc [ Pn G                  Cursor Horizontal Absolute
1361  *  Esc [ Pn X                  Erase Characters
1362  *  Esc [ Ps J                  Erase in Display
1363  *  Esc [ Ps K                  Erase in Line
1364  * // FIXME: add all the new ones.
1365  *
1366  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1367  *  Ps is a selective parameter.
1368  */
1369 static void
1370 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1371 {
1372         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1373
1374         if (tp->esc_state == ESnormal) {
1375                 if (ch == 0x1b)
1376                         /* Starting new escape sequence. */
1377                         tp->esc_state = ESesc;
1378                 return;
1379         }
1380         if (tp->esc_state == ESesc) {
1381                 tp->esc_state = ESnormal;
1382                 switch (ch) {
1383                 case '[':
1384                         tp->esc_state = ESsquare;
1385                         break;
1386                 case 'E':
1387                         tty3270_cr(tp);
1388                         tty3270_lf(tp);
1389                         break;
1390                 case 'M':
1391                         tty3270_ri(tp);
1392                         break;
1393                 case 'D':
1394                         tty3270_lf(tp);
1395                         break;
1396                 case 'Z':               /* Respond ID. */
1397                         kbd_puts_queue(tp->tty, "\033[?6c");
1398                         break;
1399                 case '7':               /* Save cursor position. */
1400                         tp->saved_cx = tp->cx;
1401                         tp->saved_cy = tp->cy;
1402                         tp->saved_highlight = tp->highlight;
1403                         tp->saved_f_color = tp->f_color;
1404                         break;
1405                 case '8':               /* Restore cursor position. */
1406                         tty3270_convert_line(tp, tp->cy);
1407                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1408                         tp->highlight = tp->saved_highlight;
1409                         tp->f_color = tp->saved_f_color;
1410                         break;
1411                 case 'c':               /* Reset terminal. */
1412                         tp->cx = tp->saved_cx = 0;
1413                         tp->cy = tp->saved_cy = 0;
1414                         tp->highlight = tp->saved_highlight = TAX_RESET;
1415                         tp->f_color = tp->saved_f_color = TAC_RESET;
1416                         tty3270_erase_display(tp, 2);
1417                         break;
1418                 }
1419                 return;
1420         }
1421         if (tp->esc_state == ESsquare) {
1422                 tp->esc_state = ESgetpars;
1423                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1424                 tp->esc_npar = 0;
1425                 tp->esc_ques = (ch == '?');
1426                 if (tp->esc_ques)
1427                         return;
1428         }
1429         if (tp->esc_state == ESgetpars) {
1430                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1431                         tp->esc_npar++;
1432                         return;
1433                 }
1434                 if (ch >= '0' && ch <= '9') {
1435                         tp->esc_par[tp->esc_npar] *= 10;
1436                         tp->esc_par[tp->esc_npar] += ch - '0';
1437                         return;
1438                 }
1439         }
1440         tp->esc_state = ESnormal;
1441         if (ch == 'n' && !tp->esc_ques) {
1442                 if (tp->esc_par[0] == 5)                /* Status report. */
1443                         kbd_puts_queue(tp->tty, "\033[0n");
1444                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1445                         char buf[40];
1446                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1447                         kbd_puts_queue(tp->tty, buf);
1448                 }
1449                 return;
1450         }
1451         if (tp->esc_ques)
1452                 return;
1453         switch (ch) {
1454         case 'm':
1455                 tty3270_set_attributes(tp);
1456                 break;
1457         case 'H':       /* Set cursor position. */
1458         case 'f':
1459                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1460                                 tty3270_getpar(tp, 0) - 1);
1461                 break;
1462         case 'd':       /* Set y position. */
1463                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1464                 break;
1465         case 'A':       /* Cursor up. */
1466         case 'F':
1467                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1468                 break;
1469         case 'B':       /* Cursor down. */
1470         case 'e':
1471         case 'E':
1472                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1473                 break;
1474         case 'C':       /* Cursor forward. */
1475         case 'a':
1476                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1477                 break;
1478         case 'D':       /* Cursor backward. */
1479                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1480                 break;
1481         case 'G':       /* Set x position. */
1482         case '`':
1483                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1484                 break;
1485         case 'X':       /* Erase Characters. */
1486                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1487                 break;
1488         case 'J':       /* Erase display. */
1489                 tty3270_erase_display(tp, tp->esc_par[0]);
1490                 break;
1491         case 'K':       /* Erase line. */
1492                 tty3270_erase_line(tp, tp->esc_par[0]);
1493                 break;
1494         case 'P':       /* Delete characters. */
1495                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1496                 break;
1497         case '@':       /* Insert characters. */
1498                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1499                 break;
1500         case 's':       /* Save cursor position. */
1501                 tp->saved_cx = tp->cx;
1502                 tp->saved_cy = tp->cy;
1503                 tp->saved_highlight = tp->highlight;
1504                 tp->saved_f_color = tp->f_color;
1505                 break;
1506         case 'u':       /* Restore cursor position. */
1507                 tty3270_convert_line(tp, tp->cy);
1508                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1509                 tp->highlight = tp->saved_highlight;
1510                 tp->f_color = tp->saved_f_color;
1511                 break;
1512         }
1513 }
1514
1515 /*
1516  * String write routine for 3270 ttys
1517  */
1518 static void
1519 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1520 {
1521         int i_msg, i;
1522
1523         spin_lock_bh(&tp->view.lock);
1524         for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1525                 if (tp->esc_state != 0) {
1526                         /* Continue escape sequence. */
1527                         tty3270_escape_sequence(tp, buf[i_msg]);
1528                         continue;
1529                 }
1530
1531                 switch (buf[i_msg]) {
1532                 case 0x07:              /* '\a' -- Alarm */
1533                         tp->wcc |= TW_PLUSALARM;
1534                         break;
1535                 case 0x08:              /* Backspace. */
1536                         if (tp->cx > 0) {
1537                                 tp->cx--;
1538                                 tty3270_put_character(tp, ' ');
1539                         }
1540                         break;
1541                 case 0x09:              /* '\t' -- Tabulate */
1542                         for (i = tp->cx % 8; i < 8; i++) {
1543                                 if (tp->cx >= tp->view.cols) {
1544                                         tty3270_cr(tp);
1545                                         tty3270_lf(tp);
1546                                         break;
1547                                 }
1548                                 tty3270_put_character(tp, ' ');
1549                                 tp->cx++;
1550                         }
1551                         break;
1552                 case 0x0a:              /* '\n' -- New Line */
1553                         tty3270_cr(tp);
1554                         tty3270_lf(tp);
1555                         break;
1556                 case 0x0c:              /* '\f' -- Form Feed */
1557                         tty3270_erase_display(tp, 2);
1558                         tp->cx = tp->cy = 0;
1559                         break;
1560                 case 0x0d:              /* '\r' -- Carriage Return */
1561                         tp->cx = 0;
1562                         break;
1563                 case 0x0f:              /* SuSE "exit alternate mode" */
1564                         break;
1565                 case 0x1b:              /* Start escape sequence. */
1566                         tty3270_escape_sequence(tp, buf[i_msg]);
1567                         break;
1568                 default:                /* Insert normal character. */
1569                         if (tp->cx >= tp->view.cols) {
1570                                 tty3270_cr(tp);
1571                                 tty3270_lf(tp);
1572                         }
1573                         tty3270_put_character(tp, buf[i_msg]);
1574                         tp->cx++;
1575                         break;
1576                 }
1577         }
1578         /* Convert current line to 3270 data fragment. */
1579         tty3270_convert_line(tp, tp->cy);
1580
1581         /* Setup timer to update display after 1/10 second */
1582         if (!timer_pending(&tp->timer))
1583                 tty3270_set_timer(tp, HZ/10);
1584
1585         spin_unlock_bh(&tp->view.lock);
1586 }
1587
1588 /*
1589  * String write routine for 3270 ttys
1590  */
1591 static int
1592 tty3270_write(struct tty_struct * tty,
1593               const unsigned char *buf, int count)
1594 {
1595         struct tty3270 *tp;
1596
1597         tp = tty->driver_data;
1598         if (!tp)
1599                 return 0;
1600         if (tp->char_count > 0) {
1601                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1602                 tp->char_count = 0;
1603         }
1604         tty3270_do_write(tp, buf, count);
1605         return count;
1606 }
1607
1608 /*
1609  * Put single characters to the ttys character buffer
1610  */
1611 static void
1612 tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1613 {
1614         struct tty3270 *tp;
1615
1616         tp = tty->driver_data;
1617         if (!tp)
1618                 return;
1619         if (tp->char_count < TTY3270_CHAR_BUF_SIZE)
1620                 tp->char_buf[tp->char_count++] = ch;
1621 }
1622
1623 /*
1624  * Flush all characters from the ttys characeter buffer put there
1625  * by tty3270_put_char.
1626  */
1627 static void
1628 tty3270_flush_chars(struct tty_struct *tty)
1629 {
1630         struct tty3270 *tp;
1631
1632         tp = tty->driver_data;
1633         if (!tp)
1634                 return;
1635         if (tp->char_count > 0) {
1636                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1637                 tp->char_count = 0;
1638         }
1639 }
1640
1641 /*
1642  * Returns the number of characters in the output buffer. This is
1643  * used in tty_wait_until_sent to wait until all characters have
1644  * appeared on the screen.
1645  */
1646 static int
1647 tty3270_chars_in_buffer(struct tty_struct *tty)
1648 {
1649         return 0;
1650 }
1651
1652 static void
1653 tty3270_flush_buffer(struct tty_struct *tty)
1654 {
1655 }
1656
1657 /*
1658  * Check for visible/invisible input switches
1659  */
1660 static void
1661 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1662 {
1663         struct tty3270 *tp;
1664         int new;
1665
1666         tp = tty->driver_data;
1667         if (!tp)
1668                 return;
1669         spin_lock_bh(&tp->view.lock);
1670         if (L_ICANON(tty)) {
1671                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1672                 if (new != tp->inattr) {
1673                         tp->inattr = new;
1674                         tty3270_update_prompt(tp, NULL, 0);
1675                         tty3270_set_timer(tp, 1);
1676                 }
1677         }
1678         spin_unlock_bh(&tp->view.lock);
1679 }
1680
1681 /*
1682  * Disable reading from a 3270 tty
1683  */
1684 static void
1685 tty3270_throttle(struct tty_struct * tty)
1686 {
1687         struct tty3270 *tp;
1688
1689         tp = tty->driver_data;
1690         if (!tp)
1691                 return;
1692         tp->throttle = 1;
1693 }
1694
1695 /*
1696  * Enable reading from a 3270 tty
1697  */
1698 static void
1699 tty3270_unthrottle(struct tty_struct * tty)
1700 {
1701         struct tty3270 *tp;
1702
1703         tp = tty->driver_data;
1704         if (!tp)
1705                 return;
1706         tp->throttle = 0;
1707         if (tp->attn)
1708                 tty3270_issue_read(tp, 1);
1709 }
1710
1711 /*
1712  * Hang up the tty device.
1713  */
1714 static void
1715 tty3270_hangup(struct tty_struct *tty)
1716 {
1717         // FIXME: implement
1718 }
1719
1720 static void
1721 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1722 {
1723 }
1724
1725 static int
1726 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1727               unsigned int cmd, unsigned long arg)
1728 {
1729         struct tty3270 *tp;
1730
1731         tp = tty->driver_data;
1732         if (!tp)
1733                 return -ENODEV;
1734         if (tty->flags & (1 << TTY_IO_ERROR))
1735                 return -EIO;
1736         return kbd_ioctl(tp->kbd, file, cmd, arg);
1737 }
1738
1739 static const struct tty_operations tty3270_ops = {
1740         .open = tty3270_open,
1741         .close = tty3270_close,
1742         .write = tty3270_write,
1743         .put_char = tty3270_put_char,
1744         .flush_chars = tty3270_flush_chars,
1745         .write_room = tty3270_write_room,
1746         .chars_in_buffer = tty3270_chars_in_buffer,
1747         .flush_buffer = tty3270_flush_buffer,
1748         .throttle = tty3270_throttle,
1749         .unthrottle = tty3270_unthrottle,
1750         .hangup = tty3270_hangup,
1751         .wait_until_sent = tty3270_wait_until_sent,
1752         .ioctl = tty3270_ioctl,
1753         .set_termios = tty3270_set_termios
1754 };
1755
1756 static void tty3270_notifier(int index, int active)
1757 {
1758         if (active)
1759                 tty_register_device(tty3270_driver, index, NULL);
1760         else
1761                 tty_unregister_device(tty3270_driver, index);
1762 }
1763
1764 /*
1765  * 3270 tty registration code called from tty_init().
1766  * Most kernel services (incl. kmalloc) are available at this poimt.
1767  */
1768 static int __init tty3270_init(void)
1769 {
1770         struct tty_driver *driver;
1771         int ret;
1772
1773         driver = alloc_tty_driver(RAW3270_MAXDEVS);
1774         if (!driver)
1775                 return -ENOMEM;
1776
1777         /*
1778          * Initialize the tty_driver structure
1779          * Entries in tty3270_driver that are NOT initialized:
1780          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1781          */
1782         driver->owner = THIS_MODULE;
1783         driver->driver_name = "ttyTUB";
1784         driver->name = "ttyTUB";
1785         driver->major = IBM_TTY3270_MAJOR;
1786         driver->minor_start = RAW3270_FIRSTMINOR;
1787         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1788         driver->subtype = SYSTEM_TYPE_TTY;
1789         driver->init_termios = tty_std_termios;
1790         driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV;
1791         tty_set_operations(driver, &tty3270_ops);
1792         ret = tty_register_driver(driver);
1793         if (ret) {
1794                 printk(KERN_ERR "tty3270 registration failed with %d\n", ret);
1795                 put_tty_driver(driver);
1796                 return ret;
1797         }
1798         tty3270_driver = driver;
1799         ret = raw3270_register_notifier(tty3270_notifier);
1800         if (ret) {
1801                 printk(KERN_ERR "tty3270 notifier registration failed "
1802                        "with %d\n", ret);
1803                 put_tty_driver(driver);
1804                 return ret;
1805
1806         }
1807         return 0;
1808 }
1809
1810 static void __exit
1811 tty3270_exit(void)
1812 {
1813         struct tty_driver *driver;
1814
1815         raw3270_unregister_notifier(tty3270_notifier);
1816         driver = tty3270_driver;
1817         tty3270_driver = NULL;
1818         tty_unregister_driver(driver);
1819         tty3270_del_views();
1820 }
1821
1822 MODULE_LICENSE("GPL");
1823 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1824
1825 module_init(tty3270_init);
1826 module_exit(tty3270_exit);