43c8c9f5f301304dd440ef84d0e359634daa6d31
[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/config.h>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kdev_t.h>
15 #include <linux/tty.h>
16 #include <linux/vt_kern.h>
17 #include <linux/init.h>
18 #include <linux/console.h>
19 #include <linux/interrupt.h>
20
21 #include <linux/slab.h>
22 #include <linux/bootmem.h>
23
24 #include <asm/ccwdev.h>
25 #include <asm/cio.h>
26 #include <asm/ebcdic.h>
27 #include <asm/uaccess.h>
28
29
30 #include "raw3270.h"
31 #include "keyboard.h"
32
33 #define TTY3270_CHAR_BUF_SIZE 256
34 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
35 #define TTY3270_STRING_PAGES 5
36
37 struct tty_driver *tty3270_driver;
38 static int tty3270_max_index;
39
40 struct raw3270_fn tty3270_fn;
41
42 struct tty3270_cell {
43         unsigned char character;
44         unsigned char highlight;
45         unsigned char f_color;
46 };
47
48 struct tty3270_line {
49         struct tty3270_cell *cells;
50         int len;
51 };
52
53 #define ESCAPE_NPAR 8
54
55 /*
56  * The main tty view data structure.
57  * FIXME:
58  * 1) describe line orientation & lines list concept against screen
59  * 2) describe conversion of screen to lines
60  * 3) describe line format.
61  */
62 struct tty3270 {
63         struct raw3270_view view;
64         struct tty_struct *tty;         /* Pointer to tty structure */
65         void **freemem_pages;           /* Array of pages used for freemem. */
66         struct list_head freemem;       /* List of free memory for strings. */
67
68         /* Output stuff. */
69         struct list_head lines;         /* List of lines. */
70         struct list_head update;        /* List of lines to update. */
71         unsigned char wcc;              /* Write control character. */
72         int nr_lines;                   /* # lines in list. */
73         int nr_up;                      /* # lines up in history. */
74         unsigned long update_flags;     /* Update indication bits. */
75         struct string *status;          /* Lower right of display. */
76         struct raw3270_request *write;  /* Single write request. */
77         struct timer_list timer;        /* Output delay timer. */
78
79         /* Current tty screen. */
80         unsigned int cx, cy;            /* Current output position. */
81         unsigned int highlight;         /* Blink/reverse/underscore */
82         unsigned int f_color;           /* Foreground color */
83         struct tty3270_line *screen;
84
85         /* Input stuff. */
86         struct string *prompt;          /* Output string for input area. */
87         struct string *input;           /* Input string for read request. */
88         struct raw3270_request *read;   /* Single read request. */
89         struct raw3270_request *kreset; /* Single keyboard reset request. */
90         unsigned char inattr;           /* Visible/invisible input. */
91         int throttle, attn;             /* tty throttle/unthrottle. */
92         struct tasklet_struct readlet;  /* Tasklet to issue read request. */
93         struct kbd_data *kbd;           /* key_maps stuff. */
94
95         /* Escape sequence parsing. */
96         int esc_state, esc_ques, esc_npar;
97         int esc_par[ESCAPE_NPAR];
98         unsigned int saved_cx, saved_cy;
99         unsigned int saved_highlight, saved_f_color;
100
101         /* Command recalling. */
102         struct list_head rcl_lines;     /* List of recallable lines. */
103         struct list_head *rcl_walk;     /* Point in rcl_lines list. */
104         int rcl_nr, rcl_max;            /* Number/max number of rcl_lines. */
105
106         /* Character array for put_char/flush_chars. */
107         unsigned int char_count;
108         char char_buf[TTY3270_CHAR_BUF_SIZE];
109 };
110
111 /* tty3270->update_flags. See tty3270_update for details. */
112 #define TTY_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
113 #define TTY_UPDATE_LIST         2       /* Update lines in tty3270->update. */
114 #define TTY_UPDATE_INPUT        4       /* Update input line. */
115 #define TTY_UPDATE_STATUS       8       /* Update status line. */
116 #define TTY_UPDATE_ALL          15
117
118 static void tty3270_update(struct tty3270 *);
119
120 /*
121  * Setup timeout for a device. On timeout trigger an update.
122  */
123 void
124 tty3270_set_timer(struct tty3270 *tp, int expires)
125 {
126         if (expires == 0) {
127                 if (timer_pending(&tp->timer) && del_timer(&tp->timer))
128                         raw3270_put_view(&tp->view);
129                 return;
130         }
131         if (timer_pending(&tp->timer) &&
132             mod_timer(&tp->timer, jiffies + expires))
133                 return;
134         raw3270_get_view(&tp->view);
135         tp->timer.function = (void (*)(unsigned long)) tty3270_update;
136         tp->timer.data = (unsigned long) tp;
137         tp->timer.expires = jiffies + expires;
138         add_timer(&tp->timer);
139 }
140
141 /*
142  * The input line are the two last lines of the screen.
143  */
144 static void
145 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
146 {
147         struct string *line;
148         unsigned int off;
149
150         line = tp->prompt;
151         if (count != 0)
152                 line->string[5] = TF_INMDT;
153         else
154                 line->string[5] = tp->inattr;
155         if (count > tp->view.cols * 2 - 11)
156                 count = tp->view.cols * 2 - 11;
157         memcpy(line->string + 6, input, count);
158         line->string[6 + count] = TO_IC;
159         /* Clear to end of input line. */
160         if (count < tp->view.cols * 2 - 11) {
161                 line->string[7 + count] = TO_RA;
162                 line->string[10 + count] = 0;
163                 off = tp->view.cols * tp->view.rows - 9;
164                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
165                 line->len = 11 + count;
166         } else
167                 line->len = 7 + count;
168         tp->update_flags |= TTY_UPDATE_INPUT;
169 }
170
171 static void
172 tty3270_create_prompt(struct tty3270 *tp)
173 {
174         static const unsigned char blueprint[] =
175                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
176                   /* empty input string */
177                   TO_IC, TO_RA, 0, 0, 0 };
178         struct string *line;
179         unsigned int offset;
180
181         line = alloc_string(&tp->freemem,
182                             sizeof(blueprint) + tp->view.cols * 2 - 9);
183         tp->prompt = line;
184         tp->inattr = TF_INPUT;
185         /* Copy blueprint to status line */
186         memcpy(line->string, blueprint, sizeof(blueprint));
187         line->len = sizeof(blueprint);
188         /* Set output offsets. */
189         offset = tp->view.cols * (tp->view.rows - 2);
190         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
191         offset = tp->view.cols * tp->view.rows - 9;
192         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
193
194         /* Allocate input string for reading. */
195         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
196 }
197
198 /*
199  * The status line is the last line of the screen. It shows the string
200  * "Running"/"Holding" in the lower right corner of the screen.
201  */
202 static void
203 tty3270_update_status(struct tty3270 * tp)
204 {
205         char *str;
206
207         str = (tp->nr_up != 0) ? "History" : "Running";
208         memcpy(tp->status->string + 8, str, 7);
209         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
210         tp->update_flags |= TTY_UPDATE_STATUS;
211 }
212
213 static void
214 tty3270_create_status(struct tty3270 * tp)
215 {
216         static const unsigned char blueprint[] =
217                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
218                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
219                   TAC_RESET };
220         struct string *line;
221         unsigned int offset;
222
223         line = alloc_string(&tp->freemem,sizeof(blueprint));
224         tp->status = line;
225         /* Copy blueprint to status line */
226         memcpy(line->string, blueprint, sizeof(blueprint));
227         /* Set address to start of status string (= last 9 characters). */
228         offset = tp->view.cols * tp->view.rows - 9;
229         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
230 }
231
232 /*
233  * Set output offsets to 3270 datastream fragment of a tty string.
234  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
235  */
236 static void
237 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
238 {
239         unsigned char *cp;
240
241         raw3270_buffer_address(tp->view.dev, line->string + 1,
242                                tp->view.cols * nr);
243         cp = line->string + line->len - 4;
244         if (*cp == TO_RA)
245                 raw3270_buffer_address(tp->view.dev, cp + 1,
246                                        tp->view.cols * (nr + 1));
247 }
248
249 /*
250  * Rebuild update list to print all lines.
251  */
252 static void
253 tty3270_rebuild_update(struct tty3270 *tp)
254 {
255         struct string *s, *n;
256         int line, nr_up;
257
258         /* 
259          * Throw away update list and create a new one,
260          * containing all lines that will fit on the screen.
261          */
262         list_for_each_entry_safe(s, n, &tp->update, update)
263                 list_del_init(&s->update);
264         line = tp->view.rows - 3;
265         nr_up = tp->nr_up;
266         list_for_each_entry_reverse(s, &tp->lines, list) {
267                 if (nr_up > 0) {
268                         nr_up--;
269                         continue;
270                 }
271                 tty3270_update_string(tp, s, line);
272                 list_add(&s->update, &tp->update);
273                 if (--line < 0)
274                         break;
275         }
276         tp->update_flags |= TTY_UPDATE_LIST;
277 }
278
279 /*
280  * Alloc string for size bytes. If there is not enough room in
281  * freemem, free strings until there is room.
282  */
283 static struct string *
284 tty3270_alloc_string(struct tty3270 *tp, size_t size)
285 {
286         struct string *s, *n;
287
288         s = alloc_string(&tp->freemem, size);
289         if (s)
290                 return s;
291         list_for_each_entry_safe(s, n, &tp->lines, list) {
292                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
293                 list_del(&s->list);
294                 if (!list_empty(&s->update))
295                         list_del(&s->update);
296                 tp->nr_lines--;
297                 if (free_string(&tp->freemem, s) >= size)
298                         break;
299         }
300         s = alloc_string(&tp->freemem, size);
301         BUG_ON(!s);
302         if (tp->nr_up != 0 &&
303             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
304                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
305                 tty3270_rebuild_update(tp);
306                 tty3270_update_status(tp);
307         }
308         return s;
309 }
310
311 /*
312  * Add an empty line to the list.
313  */
314 static void
315 tty3270_blank_line(struct tty3270 *tp)
316 {
317         static const unsigned char blueprint[] =
318                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
319                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
320         struct string *s;
321
322         s = tty3270_alloc_string(tp, sizeof(blueprint));
323         memcpy(s->string, blueprint, sizeof(blueprint));
324         s->len = sizeof(blueprint);
325         list_add_tail(&s->list, &tp->lines);
326         tp->nr_lines++;
327         if (tp->nr_up != 0)
328                 tp->nr_up++;
329 }
330
331 /*
332  * Write request completion callback.
333  */
334 static void
335 tty3270_write_callback(struct raw3270_request *rq, void *data)
336 {
337         struct tty3270 *tp;
338
339         tp = (struct tty3270 *) rq->view;
340         if (rq->rc != 0) {
341                 /* Write wasn't successfull. Refresh all. */
342                 tty3270_rebuild_update(tp);
343                 tp->update_flags = TTY_UPDATE_ALL;
344                 tty3270_set_timer(tp, 1);
345         }
346         raw3270_request_reset(rq);
347         xchg(&tp->write, rq);
348 }
349
350 /*
351  * Update 3270 display.
352  */
353 static void
354 tty3270_update(struct tty3270 *tp)
355 {
356         static char invalid_sba[2] = { 0xff, 0xff };
357         struct raw3270_request *wrq;
358         unsigned long updated;
359         struct string *s, *n;
360         char *sba, *str;
361         int rc, len;
362
363         wrq = xchg(&tp->write, 0);
364         if (!wrq) {
365                 tty3270_set_timer(tp, 1);
366                 return;
367         }
368
369         spin_lock(&tp->view.lock);
370         updated = 0;
371         if (tp->update_flags & TTY_UPDATE_ERASE) {
372                 /* Use erase write alternate to erase display. */
373                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
374                 updated |= TTY_UPDATE_ERASE;
375         } else
376                 raw3270_request_set_cmd(wrq, TC_WRITE);
377
378         raw3270_request_add_data(wrq, &tp->wcc, 1);
379         tp->wcc = TW_NONE;
380
381         /*
382          * Update status line.
383          */
384         if (tp->update_flags & TTY_UPDATE_STATUS)
385                 if (raw3270_request_add_data(wrq, tp->status->string,
386                                              tp->status->len) == 0)
387                         updated |= TTY_UPDATE_STATUS;
388
389         /*
390          * Write input line.
391          */
392         if (tp->update_flags & TTY_UPDATE_INPUT)
393                 if (raw3270_request_add_data(wrq, tp->prompt->string,
394                                              tp->prompt->len) == 0)
395                         updated |= TTY_UPDATE_INPUT;
396
397         sba = invalid_sba;
398         
399         if (tp->update_flags & TTY_UPDATE_LIST) {
400                 /* Write strings in the update list to the screen. */
401                 list_for_each_entry_safe(s, n, &tp->update, update) {
402                         str = s->string;
403                         len = s->len;
404                         /*
405                          * Skip TO_SBA at the start of the string if the
406                          * last output position matches the start address
407                          * of this line.
408                          */
409                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
410                                 str += 3, len -= 3;
411                         if (raw3270_request_add_data(wrq, str, len) != 0)
412                                 break;
413                         list_del_init(&s->update);
414                         sba = s->string + s->len - 3;
415                 }
416                 if (list_empty(&tp->update))
417                         updated |= TTY_UPDATE_LIST;
418         }
419         wrq->callback = tty3270_write_callback;
420         rc = raw3270_start(&tp->view, wrq);
421         if (rc == 0) {
422                 tp->update_flags &= ~updated;
423                 if (tp->update_flags)
424                         tty3270_set_timer(tp, 1);
425         } else {
426                 raw3270_request_reset(wrq);
427                 xchg(&tp->write, wrq);
428         }
429         spin_unlock(&tp->view.lock);
430         raw3270_put_view(&tp->view);
431 }
432
433 /*
434  * Command recalling.
435  */
436 static void
437 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
438 {
439         struct string *s;
440
441         tp->rcl_walk = 0;
442         if (len <= 0)
443                 return;
444         if (tp->rcl_nr >= tp->rcl_max) {
445                 s = list_entry(tp->rcl_lines.next, struct string, list);
446                 list_del(&s->list);
447                 free_string(&tp->freemem, s);
448                 tp->rcl_nr--;
449         }
450         s = tty3270_alloc_string(tp, len);
451         memcpy(s->string, input, len);
452         list_add_tail(&s->list, &tp->rcl_lines);
453         tp->rcl_nr++;
454 }
455
456 static void
457 tty3270_rcl_backward(struct kbd_data *kbd)
458 {
459         struct tty3270 *tp;
460         struct string *s;
461
462         tp = kbd->tty->driver_data;
463         spin_lock_bh(&tp->view.lock);
464         if (tp->inattr == TF_INPUT) {
465                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
466                         tp->rcl_walk = tp->rcl_walk->prev;
467                 else if (!list_empty(&tp->rcl_lines))
468                         tp->rcl_walk = tp->rcl_lines.prev;
469                 s = tp->rcl_walk ? 
470                         list_entry(tp->rcl_walk, struct string, list) : 0;
471                 if (tp->rcl_walk) {
472                         s = list_entry(tp->rcl_walk, struct string, list);
473                         tty3270_update_prompt(tp, s->string, s->len);
474                 } else
475                         tty3270_update_prompt(tp, 0, 0);
476                 tty3270_set_timer(tp, 1);
477         }
478         spin_unlock_bh(&tp->view.lock);
479 }
480
481 /*
482  * Deactivate tty view.
483  */
484 static void
485 tty3270_exit_tty(struct kbd_data *kbd)
486 {
487         struct tty3270 *tp;
488
489         tp = kbd->tty->driver_data;
490         raw3270_deactivate_view(&tp->view);
491 }
492
493 /*
494  * Scroll forward in history.
495  */
496 static void
497 tty3270_scroll_forward(struct kbd_data *kbd)
498 {
499         struct tty3270 *tp;
500         int nr_up;
501
502         tp = kbd->tty->driver_data;
503         spin_lock_bh(&tp->view.lock);
504         nr_up = tp->nr_up - tp->view.rows + 2;
505         if (nr_up < 0)
506                 nr_up = 0;
507         if (nr_up != tp->nr_up) {
508                 tp->nr_up = nr_up;
509                 tty3270_rebuild_update(tp);
510                 tty3270_update_status(tp);
511                 tty3270_set_timer(tp, 1);
512         }
513         spin_unlock_bh(&tp->view.lock);
514 }
515
516 /*
517  * Scroll backward in history.
518  */
519 static void
520 tty3270_scroll_backward(struct kbd_data *kbd)
521 {
522         struct tty3270 *tp;
523         int nr_up;
524
525         tp = kbd->tty->driver_data;
526         spin_lock_bh(&tp->view.lock);
527         nr_up = tp->nr_up + tp->view.rows - 2;
528         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
529                 nr_up = tp->nr_lines - tp->view.rows + 2;
530         if (nr_up != tp->nr_up) {
531                 tp->nr_up = nr_up;
532                 tty3270_rebuild_update(tp);
533                 tty3270_update_status(tp);
534                 tty3270_set_timer(tp, 1);
535         }
536         spin_unlock_bh(&tp->view.lock);
537 }
538
539 /*
540  * Pass input line to tty.
541  */
542 static void
543 tty3270_read_tasklet(struct raw3270_request *rrq)
544 {
545         static char kreset_data = TW_KR;
546         struct tty3270 *tp;
547         char *input;
548         int len;
549
550         tp = (struct tty3270 *) rrq->view;
551         spin_lock_bh(&tp->view.lock);
552         /*
553          * Two AID keys are special: For 0x7d (enter) the input line
554          * has to be emitted to the tty and for 0x6d the screen
555          * needs to be redrawn.
556          */
557         input = 0;
558         len = 0;
559         if (tp->input->string[0] == 0x7d) {
560                 /* Enter: write input to tty. */
561                 input = tp->input->string + 6;
562                 len = tp->input->len - 6 - rrq->rescnt;
563                 if (tp->inattr != TF_INPUTN)
564                         tty3270_rcl_add(tp, input, len);
565                 if (tp->nr_up > 0) {
566                         tp->nr_up = 0;
567                         tty3270_rebuild_update(tp);
568                         tty3270_update_status(tp);
569                 }
570                 /* Clear input area. */
571                 tty3270_update_prompt(tp, 0, 0);
572                 tty3270_set_timer(tp, 1);
573         } else if (tp->input->string[0] == 0x6d) {
574                 /* Display has been cleared. Redraw. */
575                 tty3270_rebuild_update(tp);
576                 tp->update_flags = TTY_UPDATE_ALL;
577                 tty3270_set_timer(tp, 1);
578         }
579         spin_unlock_bh(&tp->view.lock);
580
581         /* Start keyboard reset command. */
582         raw3270_request_reset(tp->kreset);
583         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
584         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
585         raw3270_start(&tp->view, tp->kreset);
586
587         /* Emit input string. */
588         if (tp->tty) {
589                 while (len-- > 0)
590                         kbd_keycode(tp->kbd, *input++);
591                 /* Emit keycode for AID byte. */
592                 kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
593         }
594
595         raw3270_request_reset(rrq);
596         xchg(&tp->read, rrq);
597         raw3270_put_view(&tp->view);
598 }
599
600 /*
601  * Read request completion callback.
602  */
603 static void
604 tty3270_read_callback(struct raw3270_request *rq, void *data)
605 {
606         raw3270_get_view(rq->view);
607         /* Schedule tasklet to pass input to tty. */
608         tasklet_schedule(&((struct tty3270 *) rq->view)->readlet);
609 }
610
611 /*
612  * Issue a read request. Call with device lock.
613  */
614 static void
615 tty3270_issue_read(struct tty3270 *tp, int lock)
616 {
617         struct raw3270_request *rrq;
618         int rc;
619
620         rrq = xchg(&tp->read, 0);
621         if (!rrq)
622                 /* Read already scheduled. */
623                 return;
624         rrq->callback = tty3270_read_callback;
625         rrq->callback_data = tp;
626         raw3270_request_set_cmd(rrq, TC_READMOD);
627         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
628         /* Issue the read modified request. */
629         if (lock) {
630                 rc = raw3270_start(&tp->view, rrq);
631         } else
632                 rc = raw3270_start_irq(&tp->view, rrq);
633         if (rc) {
634                 raw3270_request_reset(rrq);
635                 xchg(&tp->read, rrq);
636         }
637 }
638
639 /*
640  * Switch to the tty view.
641  */
642 static int
643 tty3270_activate(struct raw3270_view *view)
644 {
645         struct tty3270 *tp;
646         unsigned long flags;
647
648         tp = (struct tty3270 *) view;
649         spin_lock_irqsave(&tp->view.lock, flags);
650         tp->nr_up = 0;
651         tty3270_rebuild_update(tp);
652         tty3270_update_status(tp);
653         tp->update_flags = TTY_UPDATE_ALL;
654         tty3270_set_timer(tp, 1);
655         spin_unlock_irqrestore(&tp->view.lock, flags);
656         return 0;
657 }
658
659 static void
660 tty3270_deactivate(struct raw3270_view *view)
661 {
662 }
663
664 static int
665 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
666 {
667         /* Handle ATTN. Schedule tasklet to read aid. */
668         if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
669                 if (!tp->throttle)
670                         tty3270_issue_read(tp, 0);
671                 else
672                         tp->attn = 1;
673         }
674
675         if (rq) {
676                 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
677                         rq->rc = -EIO;
678                 else
679                         /* Normal end. Copy residual count. */
680                         rq->rescnt = irb->scsw.count;
681         }
682         return RAW3270_IO_DONE;
683 }
684
685 /*
686  * Allocate tty3270 structure.
687  */
688 static struct tty3270 *
689 tty3270_alloc_view(void)
690 {
691         struct tty3270 *tp;
692         int pages;
693
694         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
695         if (!tp)
696                 goto out_err;
697         tp->freemem_pages =
698                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
699         if (!tp->freemem_pages)
700                 goto out_tp;
701         INIT_LIST_HEAD(&tp->freemem);
702         init_timer(&tp->timer);
703         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
704                 tp->freemem_pages[pages] = (void *)
705                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
706                 if (!tp->freemem_pages[pages])
707                         goto out_pages;
708                 add_string_memory(&tp->freemem,
709                                   tp->freemem_pages[pages], PAGE_SIZE);
710         }
711         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
712         if (IS_ERR(tp->write))
713                 goto out_pages;
714         tp->read = raw3270_request_alloc(0);
715         if (IS_ERR(tp->read))
716                 goto out_write;
717         tp->kreset = raw3270_request_alloc(1);
718         if (IS_ERR(tp->kreset))
719                 goto out_read;
720         tp->kbd = kbd_alloc();
721         if (!tp->kbd)
722                 goto out_reset;
723         return tp;
724
725 out_reset:
726         raw3270_request_free(tp->kreset);
727 out_read:
728         raw3270_request_free(tp->read);
729 out_write:
730         raw3270_request_free(tp->write);
731 out_pages:
732         while (pages--)
733                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
734         kfree(tp->freemem_pages);
735 out_tp:
736         kfree(tp);
737 out_err:
738         return ERR_PTR(-ENOMEM);
739 }
740
741 /*
742  * Free tty3270 structure.
743  */
744 static void
745 tty3270_free_view(struct tty3270 *tp)
746 {
747         int pages;
748
749         kbd_free(tp->kbd);
750         raw3270_request_free(tp->kreset);
751         raw3270_request_free(tp->read);
752         raw3270_request_free(tp->write);
753         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
754                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
755         kfree(tp->freemem_pages);
756         kfree(tp);
757 }
758
759 /*
760  * Allocate tty3270 screen.
761  */
762 static int
763 tty3270_alloc_screen(struct tty3270 *tp)
764 {
765         unsigned long size;
766         int lines;
767
768         size = sizeof(struct tty3270_line) * (tp->view.rows - 2);
769         tp->screen = kzalloc(size, GFP_KERNEL);
770         if (!tp->screen)
771                 goto out_err;
772         for (lines = 0; lines < tp->view.rows - 2; lines++) {
773                 size = sizeof(struct tty3270_cell) * tp->view.cols;
774                 tp->screen[lines].cells = kzalloc(size, GFP_KERNEL);
775                 if (!tp->screen[lines].cells)
776                         goto out_screen;
777         }
778         return 0;
779 out_screen:
780         while (lines--)
781                 kfree(tp->screen[lines].cells);
782         kfree(tp->screen);
783 out_err:
784         return -ENOMEM;
785 }
786
787 /*
788  * Free tty3270 screen.
789  */
790 static void
791 tty3270_free_screen(struct tty3270 *tp)
792 {
793         int lines;
794
795         for (lines = 0; lines < tp->view.rows - 2; lines++)
796                 kfree(tp->screen[lines].cells);
797         kfree(tp->screen);
798 }
799
800 /*
801  * Unlink tty3270 data structure from tty.
802  */
803 static void
804 tty3270_release(struct raw3270_view *view)
805 {
806         struct tty3270 *tp;
807         struct tty_struct *tty;
808
809         tp = (struct tty3270 *) view;
810         tty = tp->tty;
811         if (tty) {
812                 tty->driver_data = 0;
813                 tp->tty = tp->kbd->tty = 0;
814                 tty_hangup(tty);
815                 raw3270_put_view(&tp->view);
816         }
817 }
818
819 /*
820  * Free tty3270 data structure
821  */
822 static void
823 tty3270_free(struct raw3270_view *view)
824 {
825         tty3270_free_screen((struct tty3270 *) view);
826         tty3270_free_view((struct tty3270 *) view);
827 }
828
829 /*
830  * Delayed freeing of tty3270 views.
831  */
832 static void
833 tty3270_del_views(void)
834 {
835         struct tty3270 *tp;
836         int i;
837
838         for (i = 0; i < tty3270_max_index; i++) {
839                 tp = (struct tty3270 *)
840                         raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
841                 if (!IS_ERR(tp))
842                         raw3270_del_view(&tp->view);
843         }
844 }
845
846 struct raw3270_fn tty3270_fn = {
847         .activate = tty3270_activate,
848         .deactivate = tty3270_deactivate,
849         .intv = (void *) tty3270_irq,
850         .release = tty3270_release,
851         .free = tty3270_free
852 };
853
854 /*
855  * This routine is called whenever a 3270 tty is opened.
856  */
857 static int
858 tty3270_open(struct tty_struct *tty, struct file * filp)
859 {
860         struct tty3270 *tp;
861         int i, rc;
862
863         if (tty->count > 1)
864                 return 0;
865         /* Check if the tty3270 is already there. */
866         tp = (struct tty3270 *)
867                 raw3270_find_view(&tty3270_fn,
868                                   tty->index + RAW3270_FIRSTMINOR);
869         if (!IS_ERR(tp)) {
870                 tty->driver_data = tp;
871                 tty->winsize.ws_row = tp->view.rows - 2;
872                 tty->winsize.ws_col = tp->view.cols;
873                 tty->low_latency = 0;
874                 tp->tty = tty;
875                 tp->kbd->tty = tty;
876                 tp->inattr = TF_INPUT;
877                 return 0;
878         }
879         if (tty3270_max_index < tty->index + 1)
880                 tty3270_max_index = tty->index + 1;
881
882         /* Quick exit if there is no device for tty->index. */
883         if (PTR_ERR(tp) == -ENODEV)
884                 return -ENODEV;
885
886         /* Allocate tty3270 structure on first open. */
887         tp = tty3270_alloc_view();
888         if (IS_ERR(tp))
889                 return PTR_ERR(tp);
890
891         INIT_LIST_HEAD(&tp->lines);
892         INIT_LIST_HEAD(&tp->update);
893         INIT_LIST_HEAD(&tp->rcl_lines);
894         tp->rcl_max = 20;
895         init_timer(&tp->timer);
896         tasklet_init(&tp->readlet, 
897                      (void (*)(unsigned long)) tty3270_read_tasklet,
898                      (unsigned long) tp->read);
899
900         rc = raw3270_add_view(&tp->view, &tty3270_fn,
901                               tty->index + RAW3270_FIRSTMINOR);
902         if (rc) {
903                 tty3270_free_view(tp);
904                 return rc;
905         }
906
907         rc = tty3270_alloc_screen(tp);
908         if (rc) {
909                 raw3270_put_view(&tp->view);
910                 raw3270_del_view(&tp->view);
911                 return rc;
912         }
913
914         tp->tty = tty;
915         tty->low_latency = 0;
916         tty->driver_data = tp;
917         tty->winsize.ws_row = tp->view.rows - 2;
918         tty->winsize.ws_col = tp->view.cols;
919
920         tty3270_create_prompt(tp);
921         tty3270_create_status(tp);
922         tty3270_update_status(tp);
923
924         /* Create blank line for every line in the tty output area. */
925         for (i = 0; i < tp->view.rows - 2; i++)
926                 tty3270_blank_line(tp);
927
928         tp->kbd->tty = tty;
929         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
930         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
931         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
932         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
933         kbd_ascebc(tp->kbd, tp->view.ascebc);
934
935         raw3270_activate_view(&tp->view);
936         return 0;
937 }
938
939 /*
940  * This routine is called when the 3270 tty is closed. We wait
941  * for the remaining request to be completed. Then we clean up.
942  */
943 static void
944 tty3270_close(struct tty_struct *tty, struct file * filp)
945 {
946         struct tty3270 *tp;
947
948         if (tty->count > 1)
949                 return;
950         tp = (struct tty3270 *) tty->driver_data;
951         if (tp) {
952                 tty->driver_data = 0;
953                 tp->tty = tp->kbd->tty = 0;
954                 raw3270_put_view(&tp->view);
955         }
956 }
957
958 /*
959  * We always have room.
960  */
961 static int
962 tty3270_write_room(struct tty_struct *tty)
963 {
964         return INT_MAX;
965 }
966
967 /*
968  * Insert character into the screen at the current position with the
969  * current color and highlight. This function does NOT do cursor movement.
970  */
971 static void
972 tty3270_put_character(struct tty3270 *tp, char ch)
973 {
974         struct tty3270_line *line;
975         struct tty3270_cell *cell;
976
977         line = tp->screen + tp->cy;
978         if (line->len <= tp->cx) {
979                 while (line->len < tp->cx) {
980                         cell = line->cells + line->len;
981                         cell->character = tp->view.ascebc[' '];
982                         cell->highlight = tp->highlight;
983                         cell->f_color = tp->f_color;
984                         line->len++;
985                 }
986                 line->len++;
987         }
988         cell = line->cells + tp->cx;
989         cell->character = tp->view.ascebc[(unsigned int) ch];
990         cell->highlight = tp->highlight;
991         cell->f_color = tp->f_color;
992 }
993
994 /*
995  * Convert a tty3270_line to a 3270 data fragment usable for output.
996  */
997 static void
998 tty3270_convert_line(struct tty3270 *tp, int line_nr)
999 {
1000         struct tty3270_line *line;
1001         struct tty3270_cell *cell;
1002         struct string *s, *n;
1003         unsigned char highlight;
1004         unsigned char f_color;
1005         char *cp;
1006         int flen, i;
1007
1008         /* Determine how long the fragment will be. */
1009         flen = 3;               /* Prefix (TO_SBA). */
1010         line = tp->screen + line_nr;
1011         flen += line->len;
1012         highlight = TAX_RESET;
1013         f_color = TAC_RESET;
1014         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1015                 if (cell->highlight != highlight) {
1016                         flen += 3;      /* TO_SA to switch highlight. */
1017                         highlight = cell->highlight;
1018                 }
1019                 if (cell->f_color != f_color) {
1020                         flen += 3;      /* TO_SA to switch color. */
1021                         f_color = cell->f_color;
1022                 }
1023         }
1024         if (highlight != TAX_RESET)
1025                 flen += 3;      /* TO_SA to reset hightlight. */
1026         if (f_color != TAC_RESET)
1027                 flen += 3;      /* TO_SA to reset color. */
1028         if (line->len < tp->view.cols)
1029                 flen += 4;      /* Postfix (TO_RA). */
1030
1031         /* Find the line in the list. */
1032         i = tp->view.rows - 2 - line_nr;
1033         list_for_each_entry_reverse(s, &tp->lines, list)
1034                 if (--i <= 0)
1035                         break;
1036         /*
1037          * Check if the line needs to get reallocated.
1038          */
1039         if (s->len != flen) {
1040                 /* Reallocate string. */
1041                 n = tty3270_alloc_string(tp, flen);
1042                 list_add(&n->list, &s->list);
1043                 list_del_init(&s->list);
1044                 if (!list_empty(&s->update))
1045                         list_del_init(&s->update);
1046                 free_string(&tp->freemem, s);
1047                 s = n;
1048         }
1049
1050         /* Write 3270 data fragment. */
1051         cp = s->string;
1052         *cp++ = TO_SBA;
1053         *cp++ = 0;
1054         *cp++ = 0;
1055
1056         highlight = TAX_RESET;
1057         f_color = TAC_RESET;
1058         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1059                 if (cell->highlight != highlight) {
1060                         *cp++ = TO_SA;
1061                         *cp++ = TAT_EXTHI;
1062                         *cp++ = cell->highlight;
1063                         highlight = cell->highlight;
1064                 }
1065                 if (cell->f_color != f_color) {
1066                         *cp++ = TO_SA;
1067                         *cp++ = TAT_COLOR;
1068                         *cp++ = cell->f_color;
1069                         f_color = cell->f_color;
1070                 }
1071                 *cp++ = cell->character;
1072         }
1073         if (highlight != TAX_RESET) {
1074                 *cp++ = TO_SA;
1075                 *cp++ = TAT_EXTHI;
1076                 *cp++ = TAX_RESET;
1077         }
1078         if (f_color != TAC_RESET) {
1079                 *cp++ = TO_SA;
1080                 *cp++ = TAT_COLOR;
1081                 *cp++ = TAC_RESET;
1082         }
1083         if (line->len < tp->view.cols) {
1084                 *cp++ = TO_RA;
1085                 *cp++ = 0;
1086                 *cp++ = 0;
1087                 *cp++ = 0;
1088         }
1089
1090         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1091                 /* Line is currently visible on screen. */
1092                 tty3270_update_string(tp, s, line_nr);
1093                 /* Add line to update list. */
1094                 if (list_empty(&s->update)) {
1095                         list_add_tail(&s->update, &tp->update);
1096                         tp->update_flags |= TTY_UPDATE_LIST;
1097                 }
1098         }
1099 }
1100
1101 /*
1102  * Do carriage return.
1103  */
1104 static void
1105 tty3270_cr(struct tty3270 *tp)
1106 {
1107         tp->cx = 0;
1108 }
1109
1110 /*
1111  * Do line feed.
1112  */
1113 static void
1114 tty3270_lf(struct tty3270 *tp)
1115 {
1116         struct tty3270_line temp;
1117         int i;
1118
1119         tty3270_convert_line(tp, tp->cy);
1120         if (tp->cy < tp->view.rows - 3) {
1121                 tp->cy++;
1122                 return;
1123         }
1124         /* Last line just filled up. Add new, blank line. */
1125         tty3270_blank_line(tp);
1126         temp = tp->screen[0];
1127         temp.len = 0;
1128         for (i = 0; i < tp->view.rows - 3; i++)
1129                 tp->screen[i] = tp->screen[i+1];
1130         tp->screen[tp->view.rows - 3] = temp;
1131         tty3270_rebuild_update(tp);
1132 }
1133
1134 static void
1135 tty3270_ri(struct tty3270 *tp)
1136 {
1137         if (tp->cy > 0) {
1138             tty3270_convert_line(tp, tp->cy);
1139             tp->cy--;
1140         }
1141 }
1142
1143 /*
1144  * Insert characters at current position.
1145  */
1146 static void
1147 tty3270_insert_characters(struct tty3270 *tp, int n)
1148 {
1149         struct tty3270_line *line;
1150         int k;
1151
1152         line = tp->screen + tp->cy;
1153         while (line->len < tp->cx) {
1154                 line->cells[line->len].character = tp->view.ascebc[' '];
1155                 line->cells[line->len].highlight = TAX_RESET;
1156                 line->cells[line->len].f_color = TAC_RESET;
1157                 line->len++;
1158         }
1159         if (n > tp->view.cols - tp->cx)
1160                 n = tp->view.cols - tp->cx;
1161         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1162         while (k--)
1163                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1164         line->len += n;
1165         if (line->len > tp->view.cols)
1166                 line->len = tp->view.cols;
1167         while (n-- > 0) {
1168                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1169                 line->cells[tp->cx + n].highlight = tp->highlight;
1170                 line->cells[tp->cx + n].f_color = tp->f_color;
1171         }
1172 }
1173
1174 /*
1175  * Delete characters at current position.
1176  */
1177 static void
1178 tty3270_delete_characters(struct tty3270 *tp, int n)
1179 {
1180         struct tty3270_line *line;
1181         int i;
1182
1183         line = tp->screen + tp->cy;
1184         if (line->len <= tp->cx)
1185                 return;
1186         if (line->len - tp->cx <= n) {
1187                 line->len = tp->cx;
1188                 return;
1189         }
1190         for (i = tp->cx; i + n < line->len; i++)
1191                 line->cells[i] = line->cells[i + n];
1192         line->len -= n;
1193 }
1194
1195 /*
1196  * Erase characters at current position.
1197  */
1198 static void
1199 tty3270_erase_characters(struct tty3270 *tp, int n)
1200 {
1201         struct tty3270_line *line;
1202         struct tty3270_cell *cell;
1203
1204         line = tp->screen + tp->cy;
1205         while (line->len > tp->cx && n-- > 0) {
1206                 cell = line->cells + tp->cx++;
1207                 cell->character = ' ';
1208                 cell->highlight = TAX_RESET;
1209                 cell->f_color = TAC_RESET;
1210         }
1211         tp->cx += n;
1212         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1213 }
1214
1215 /*
1216  * Erase line, 3 different cases:
1217  *  Esc [ 0 K   Erase from current position to end of line inclusive
1218  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1219  *  Esc [ 2 K   Erase entire line (without moving cursor)
1220  */
1221 static void
1222 tty3270_erase_line(struct tty3270 *tp, int mode)
1223 {
1224         struct tty3270_line *line;
1225         struct tty3270_cell *cell;
1226         int i;
1227
1228         line = tp->screen + tp->cy;
1229         if (mode == 0)
1230                 line->len = tp->cx;
1231         else if (mode == 1) {
1232                 for (i = 0; i < tp->cx; i++) {
1233                         cell = line->cells + i;
1234                         cell->character = ' ';
1235                         cell->highlight = TAX_RESET;
1236                         cell->f_color = TAC_RESET;
1237                 }
1238                 if (line->len <= tp->cx)
1239                         line->len = tp->cx + 1;
1240         } else if (mode == 2)
1241                 line->len = 0;
1242         tty3270_convert_line(tp, tp->cy);
1243 }
1244
1245 /*
1246  * Erase display, 3 different cases:
1247  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1248  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1249  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1250  */
1251 static void
1252 tty3270_erase_display(struct tty3270 *tp, int mode)
1253 {
1254         int i;
1255
1256         if (mode == 0) {
1257                 tty3270_erase_line(tp, 0);
1258                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1259                         tp->screen[i].len = 0;
1260                         tty3270_convert_line(tp, i);
1261                 }
1262         } else if (mode == 1) {
1263                 for (i = 0; i < tp->cy; i++) {
1264                         tp->screen[i].len = 0;
1265                         tty3270_convert_line(tp, i);
1266                 }
1267                 tty3270_erase_line(tp, 1);
1268         } else if (mode == 2) {
1269                 for (i = 0; i < tp->view.rows - 2; i++) {
1270                         tp->screen[i].len = 0;
1271                         tty3270_convert_line(tp, i);
1272                 }
1273         }
1274         tty3270_rebuild_update(tp);
1275 }
1276
1277 /*
1278  * Set attributes found in an escape sequence.
1279  *  Esc [ <attr> ; <attr> ; ... m
1280  */
1281 static void
1282 tty3270_set_attributes(struct tty3270 *tp)
1283 {
1284         static unsigned char f_colors[] = {
1285                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1286                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1287         };
1288         int i, attr;
1289
1290         for (i = 0; i <= tp->esc_npar; i++) {
1291                 attr = tp->esc_par[i];
1292                 switch (attr) {
1293                 case 0:         /* Reset */
1294                         tp->highlight = TAX_RESET;
1295                         tp->f_color = TAC_RESET;
1296                         break;
1297                 /* Highlight. */
1298                 case 4:         /* Start underlining. */
1299                         tp->highlight = TAX_UNDER;
1300                         break;
1301                 case 5:         /* Start blink. */
1302                         tp->highlight = TAX_BLINK;
1303                         break;
1304                 case 7:         /* Start reverse. */
1305                         tp->highlight = TAX_REVER;
1306                         break;
1307                 case 24:        /* End underlining */
1308                         if (tp->highlight == TAX_UNDER)
1309                                 tp->highlight = TAX_RESET;
1310                         break;
1311                 case 25:        /* End blink. */
1312                         if (tp->highlight == TAX_BLINK)
1313                                 tp->highlight = TAX_RESET;
1314                         break;
1315                 case 27:        /* End reverse. */
1316                         if (tp->highlight == TAX_REVER)
1317                                 tp->highlight = TAX_RESET;
1318                         break;
1319                 /* Foreground color. */
1320                 case 30:        /* Black */
1321                 case 31:        /* Red */
1322                 case 32:        /* Green */
1323                 case 33:        /* Yellow */
1324                 case 34:        /* Blue */
1325                 case 35:        /* Magenta */
1326                 case 36:        /* Cyan */
1327                 case 37:        /* White */
1328                 case 39:        /* Black */
1329                         tp->f_color = f_colors[attr - 30];
1330                         break;
1331                 }
1332         }
1333 }
1334
1335 static inline int
1336 tty3270_getpar(struct tty3270 *tp, int ix)
1337 {
1338         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1339 }
1340
1341 static void
1342 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1343 {
1344         tp->cx = min_t(int, tp->view.cols - 1, max_t(int, 0, cx));
1345         cy = min_t(int, tp->view.rows - 3, max_t(int, 0, cy));
1346         if (cy != tp->cy) {
1347                 tty3270_convert_line(tp, tp->cy);
1348                 tp->cy = cy;
1349         }
1350 }
1351
1352 /*
1353  * Process escape sequences. Known sequences:
1354  *  Esc 7                       Save Cursor Position
1355  *  Esc 8                       Restore Cursor Position
1356  *  Esc [ Pn ; Pn ; .. m        Set attributes
1357  *  Esc [ Pn ; Pn H             Cursor Position
1358  *  Esc [ Pn ; Pn f             Cursor Position
1359  *  Esc [ Pn A                  Cursor Up
1360  *  Esc [ Pn B                  Cursor Down
1361  *  Esc [ Pn C                  Cursor Forward
1362  *  Esc [ Pn D                  Cursor Backward
1363  *  Esc [ Pn G                  Cursor Horizontal Absolute
1364  *  Esc [ Pn X                  Erase Characters
1365  *  Esc [ Ps J                  Erase in Display
1366  *  Esc [ Ps K                  Erase in Line
1367  * // FIXME: add all the new ones.
1368  *
1369  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1370  *  Ps is a selective parameter.
1371  */
1372 static void
1373 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1374 {
1375         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1376
1377         if (tp->esc_state == ESnormal) {
1378                 if (ch == 0x1b)
1379                         /* Starting new escape sequence. */
1380                         tp->esc_state = ESesc;
1381                 return;
1382         }
1383         if (tp->esc_state == ESesc) {
1384                 tp->esc_state = ESnormal;
1385                 switch (ch) {
1386                 case '[':
1387                         tp->esc_state = ESsquare;
1388                         break;
1389                 case 'E':
1390                         tty3270_cr(tp);
1391                         tty3270_lf(tp);
1392                         break;
1393                 case 'M':
1394                         tty3270_ri(tp);
1395                         break;
1396                 case 'D':
1397                         tty3270_lf(tp);
1398                         break;
1399                 case 'Z':               /* Respond ID. */
1400                         kbd_puts_queue(tp->tty, "\033[?6c");
1401                         break;
1402                 case '7':               /* Save cursor position. */
1403                         tp->saved_cx = tp->cx;
1404                         tp->saved_cy = tp->cy;
1405                         tp->saved_highlight = tp->highlight;
1406                         tp->saved_f_color = tp->f_color;
1407                         break;
1408                 case '8':               /* Restore cursor position. */
1409                         tty3270_convert_line(tp, tp->cy);
1410                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1411                         tp->highlight = tp->saved_highlight;
1412                         tp->f_color = tp->saved_f_color;
1413                         break;
1414                 case 'c':               /* Reset terminal. */
1415                         tp->cx = tp->saved_cx = 0;
1416                         tp->cy = tp->saved_cy = 0;
1417                         tp->highlight = tp->saved_highlight = TAX_RESET;
1418                         tp->f_color = tp->saved_f_color = TAC_RESET;
1419                         tty3270_erase_display(tp, 2);
1420                         break;
1421                 }
1422                 return;
1423         }
1424         if (tp->esc_state == ESsquare) {
1425                 tp->esc_state = ESgetpars;
1426                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1427                 tp->esc_npar = 0;
1428                 tp->esc_ques = (ch == '?');
1429                 if (tp->esc_ques)
1430                         return;
1431         }
1432         if (tp->esc_state == ESgetpars) {
1433                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1434                         tp->esc_npar++;
1435                         return;
1436                 }
1437                 if (ch >= '0' && ch <= '9') {
1438                         tp->esc_par[tp->esc_npar] *= 10;
1439                         tp->esc_par[tp->esc_npar] += ch - '0';
1440                         return;
1441                 }
1442         }
1443         tp->esc_state = ESnormal;
1444         if (ch == 'n' && !tp->esc_ques) {
1445                 if (tp->esc_par[0] == 5)                /* Status report. */
1446                         kbd_puts_queue(tp->tty, "\033[0n");
1447                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1448                         char buf[40];
1449                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1450                         kbd_puts_queue(tp->tty, buf);
1451                 }
1452                 return;
1453         }
1454         if (tp->esc_ques)
1455                 return;
1456         switch (ch) {
1457         case 'm':
1458                 tty3270_set_attributes(tp);
1459                 break;
1460         case 'H':       /* Set cursor position. */
1461         case 'f':
1462                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1463                                 tty3270_getpar(tp, 0) - 1);
1464                 break;
1465         case 'd':       /* Set y position. */
1466                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1467                 break;
1468         case 'A':       /* Cursor up. */
1469         case 'F':
1470                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1471                 break;
1472         case 'B':       /* Cursor down. */
1473         case 'e':
1474         case 'E':
1475                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1476                 break;
1477         case 'C':       /* Cursor forward. */
1478         case 'a':
1479                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1480                 break;
1481         case 'D':       /* Cursor backward. */
1482                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1483                 break;
1484         case 'G':       /* Set x position. */
1485         case '`':
1486                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1487                 break;
1488         case 'X':       /* Erase Characters. */
1489                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1490                 break;
1491         case 'J':       /* Erase display. */
1492                 tty3270_erase_display(tp, tp->esc_par[0]);
1493                 break;
1494         case 'K':       /* Erase line. */
1495                 tty3270_erase_line(tp, tp->esc_par[0]);
1496                 break;
1497         case 'P':       /* Delete characters. */
1498                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1499                 break;
1500         case '@':       /* Insert characters. */
1501                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1502                 break;
1503         case 's':       /* Save cursor position. */
1504                 tp->saved_cx = tp->cx;
1505                 tp->saved_cy = tp->cy;
1506                 tp->saved_highlight = tp->highlight;
1507                 tp->saved_f_color = tp->f_color;
1508                 break;
1509         case 'u':       /* Restore cursor position. */
1510                 tty3270_convert_line(tp, tp->cy);
1511                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1512                 tp->highlight = tp->saved_highlight;
1513                 tp->f_color = tp->saved_f_color;
1514                 break;
1515         }
1516 }
1517
1518 /*
1519  * String write routine for 3270 ttys
1520  */
1521 static void
1522 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1523 {
1524         int i_msg, i;
1525
1526         spin_lock_bh(&tp->view.lock);
1527         for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1528                 if (tp->esc_state != 0) {
1529                         /* Continue escape sequence. */
1530                         tty3270_escape_sequence(tp, buf[i_msg]);
1531                         continue;
1532                 }
1533
1534                 switch (buf[i_msg]) {
1535                 case 0x07:              /* '\a' -- Alarm */
1536                         tp->wcc |= TW_PLUSALARM;
1537                         break;
1538                 case 0x08:              /* Backspace. */
1539                         if (tp->cx > 0) {
1540                                 tp->cx--;
1541                                 tty3270_put_character(tp, ' ');
1542                         }
1543                         break;
1544                 case 0x09:              /* '\t' -- Tabulate */
1545                         for (i = tp->cx % 8; i < 8; i++) {
1546                                 if (tp->cx >= tp->view.cols) {
1547                                         tty3270_cr(tp);
1548                                         tty3270_lf(tp);
1549                                         break;
1550                                 }
1551                                 tty3270_put_character(tp, ' ');
1552                                 tp->cx++;
1553                         }
1554                         break;
1555                 case 0x0a:              /* '\n' -- New Line */
1556                         tty3270_cr(tp);
1557                         tty3270_lf(tp);
1558                         break;
1559                 case 0x0c:              /* '\f' -- Form Feed */
1560                         tty3270_erase_display(tp, 2);
1561                         tp->cx = tp->cy = 0;
1562                         break;
1563                 case 0x0d:              /* '\r' -- Carriage Return */
1564                         tp->cx = 0;
1565                         break;
1566                 case 0x0f:              /* SuSE "exit alternate mode" */
1567                         break;
1568                 case 0x1b:              /* Start escape sequence. */
1569                         tty3270_escape_sequence(tp, buf[i_msg]);
1570                         break;
1571                 default:                /* Insert normal character. */
1572                         if (tp->cx >= tp->view.cols) {
1573                                 tty3270_cr(tp);
1574                                 tty3270_lf(tp);
1575                         }
1576                         tty3270_put_character(tp, buf[i_msg]);
1577                         tp->cx++;
1578                         break;
1579                 }
1580         }
1581         /* Convert current line to 3270 data fragment. */
1582         tty3270_convert_line(tp, tp->cy);
1583
1584         /* Setup timer to update display after 1/10 second */
1585         if (!timer_pending(&tp->timer))
1586                 tty3270_set_timer(tp, HZ/10);
1587
1588         spin_unlock_bh(&tp->view.lock);
1589 }
1590
1591 /*
1592  * String write routine for 3270 ttys
1593  */
1594 static int
1595 tty3270_write(struct tty_struct * tty,
1596               const unsigned char *buf, int count)
1597 {
1598         struct tty3270 *tp;
1599
1600         tp = tty->driver_data;
1601         if (!tp)
1602                 return 0;
1603         if (tp->char_count > 0) {
1604                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1605                 tp->char_count = 0;
1606         }
1607         tty3270_do_write(tp, buf, count);
1608         return count;
1609 }
1610
1611 /*
1612  * Put single characters to the ttys character buffer
1613  */
1614 static void
1615 tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1616 {
1617         struct tty3270 *tp;
1618
1619         tp = tty->driver_data;
1620         if (!tp)
1621                 return;
1622         if (tp->char_count < TTY3270_CHAR_BUF_SIZE)
1623                 tp->char_buf[tp->char_count++] = ch;
1624 }
1625
1626 /*
1627  * Flush all characters from the ttys characeter buffer put there
1628  * by tty3270_put_char.
1629  */
1630 static void
1631 tty3270_flush_chars(struct tty_struct *tty)
1632 {
1633         struct tty3270 *tp;
1634
1635         tp = tty->driver_data;
1636         if (!tp)
1637                 return;
1638         if (tp->char_count > 0) {
1639                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1640                 tp->char_count = 0;
1641         }
1642 }
1643
1644 /*
1645  * Returns the number of characters in the output buffer. This is
1646  * used in tty_wait_until_sent to wait until all characters have
1647  * appeared on the screen.
1648  */
1649 static int
1650 tty3270_chars_in_buffer(struct tty_struct *tty)
1651 {
1652         return 0;
1653 }
1654
1655 static void
1656 tty3270_flush_buffer(struct tty_struct *tty)
1657 {
1658 }
1659
1660 /*
1661  * Check for visible/invisible input switches
1662  */
1663 static void
1664 tty3270_set_termios(struct tty_struct *tty, struct termios *old)
1665 {
1666         struct tty3270 *tp;
1667         int new;
1668
1669         tp = tty->driver_data;
1670         if (!tp)
1671                 return;
1672         spin_lock_bh(&tp->view.lock);
1673         if (L_ICANON(tty)) {
1674                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1675                 if (new != tp->inattr) {
1676                         tp->inattr = new;
1677                         tty3270_update_prompt(tp, 0, 0);
1678                         tty3270_set_timer(tp, 1);
1679                 }
1680         }
1681         spin_unlock_bh(&tp->view.lock);
1682 }
1683
1684 /*
1685  * Disable reading from a 3270 tty
1686  */
1687 static void
1688 tty3270_throttle(struct tty_struct * tty)
1689 {
1690         struct tty3270 *tp;
1691
1692         tp = tty->driver_data;
1693         if (!tp)
1694                 return;
1695         tp->throttle = 1;
1696 }
1697
1698 /*
1699  * Enable reading from a 3270 tty
1700  */
1701 static void
1702 tty3270_unthrottle(struct tty_struct * tty)
1703 {
1704         struct tty3270 *tp;
1705
1706         tp = tty->driver_data;
1707         if (!tp)
1708                 return;
1709         tp->throttle = 0;
1710         if (tp->attn)
1711                 tty3270_issue_read(tp, 1);
1712 }
1713
1714 /*
1715  * Hang up the tty device.
1716  */
1717 static void
1718 tty3270_hangup(struct tty_struct *tty)
1719 {
1720         // FIXME: implement
1721 }
1722
1723 static void
1724 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1725 {
1726 }
1727
1728 static int
1729 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1730               unsigned int cmd, unsigned long arg)
1731 {
1732         struct tty3270 *tp;
1733
1734         tp = tty->driver_data;
1735         if (!tp)
1736                 return -ENODEV;
1737         if (tty->flags & (1 << TTY_IO_ERROR))
1738                 return -EIO;
1739         return kbd_ioctl(tp->kbd, file, cmd, arg);
1740 }
1741
1742 static struct tty_operations tty3270_ops = {
1743         .open = tty3270_open,
1744         .close = tty3270_close,
1745         .write = tty3270_write,
1746         .put_char = tty3270_put_char,
1747         .flush_chars = tty3270_flush_chars,
1748         .write_room = tty3270_write_room,
1749         .chars_in_buffer = tty3270_chars_in_buffer,
1750         .flush_buffer = tty3270_flush_buffer,
1751         .throttle = tty3270_throttle,
1752         .unthrottle = tty3270_unthrottle,
1753         .hangup = tty3270_hangup,
1754         .wait_until_sent = tty3270_wait_until_sent,
1755         .ioctl = tty3270_ioctl,
1756         .set_termios = tty3270_set_termios
1757 };
1758
1759 void
1760 tty3270_notifier(int index, int active)
1761 {
1762         if (active)
1763                 tty_register_device(tty3270_driver, index, 0);
1764         else
1765                 tty_unregister_device(tty3270_driver, index);
1766 }
1767
1768 /*
1769  * 3270 tty registration code called from tty_init().
1770  * Most kernel services (incl. kmalloc) are available at this poimt.
1771  */
1772 int __init
1773 tty3270_init(void)
1774 {
1775         struct tty_driver *driver;
1776         int ret;
1777
1778         driver = alloc_tty_driver(RAW3270_MAXDEVS);
1779         if (!driver)
1780                 return -ENOMEM;
1781
1782         /*
1783          * Initialize the tty_driver structure
1784          * Entries in tty3270_driver that are NOT initialized:
1785          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1786          */
1787         driver->owner = THIS_MODULE;
1788         driver->driver_name = "ttyTUB";
1789         driver->name = "ttyTUB";
1790         driver->major = IBM_TTY3270_MAJOR;
1791         driver->minor_start = RAW3270_FIRSTMINOR;
1792         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1793         driver->subtype = SYSTEM_TYPE_TTY;
1794         driver->init_termios = tty_std_termios;
1795         driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_NO_DEVFS;
1796         tty_set_operations(driver, &tty3270_ops);
1797         ret = tty_register_driver(driver);
1798         if (ret) {
1799                 printk(KERN_ERR "tty3270 registration failed with %d\n", ret);
1800                 put_tty_driver(driver);
1801                 return ret;
1802         }
1803         tty3270_driver = driver;
1804         ret = raw3270_register_notifier(tty3270_notifier);
1805         if (ret) {
1806                 printk(KERN_ERR "tty3270 notifier registration failed "
1807                        "with %d\n", ret);
1808                 put_tty_driver(driver);
1809                 return ret;
1810
1811         }
1812         return 0;
1813 }
1814
1815 static void __exit
1816 tty3270_exit(void)
1817 {
1818         struct tty_driver *driver;
1819
1820         raw3270_unregister_notifier(tty3270_notifier);
1821         driver = tty3270_driver;
1822         tty3270_driver = 0;
1823         tty_unregister_driver(driver);
1824         tty3270_del_views();
1825 }
1826
1827 MODULE_LICENSE("GPL");
1828 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1829
1830 module_init(tty3270_init);
1831 module_exit(tty3270_exit);