[S390] qdio: improve inbound buffer acknowledgement
[linux-2.6] / 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 #include "raw3270.h"
29 #include "tty3270.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.cmd.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.cmd.dstat & DEV_STAT_UNIT_CHECK)
675                         rq->rc = -EIO;
676                 else
677                         /* Normal end. Copy residual count. */
678                         rq->rescnt = irb->scsw.cmd.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 tty3270_put_character(struct tty3270 *tp, char ch)
969 {
970         struct tty3270_line *line;
971         struct tty3270_cell *cell;
972
973         line = tp->screen + tp->cy;
974         if (line->len <= tp->cx) {
975                 while (line->len < tp->cx) {
976                         cell = line->cells + line->len;
977                         cell->character = tp->view.ascebc[' '];
978                         cell->highlight = tp->highlight;
979                         cell->f_color = tp->f_color;
980                         line->len++;
981                 }
982                 line->len++;
983         }
984         cell = line->cells + tp->cx;
985         cell->character = tp->view.ascebc[(unsigned int) ch];
986         cell->highlight = tp->highlight;
987         cell->f_color = tp->f_color;
988 }
989
990 /*
991  * Convert a tty3270_line to a 3270 data fragment usable for output.
992  */
993 static void
994 tty3270_convert_line(struct tty3270 *tp, int line_nr)
995 {
996         struct tty3270_line *line;
997         struct tty3270_cell *cell;
998         struct string *s, *n;
999         unsigned char highlight;
1000         unsigned char f_color;
1001         char *cp;
1002         int flen, i;
1003
1004         /* Determine how long the fragment will be. */
1005         flen = 3;               /* Prefix (TO_SBA). */
1006         line = tp->screen + line_nr;
1007         flen += line->len;
1008         highlight = TAX_RESET;
1009         f_color = TAC_RESET;
1010         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1011                 if (cell->highlight != highlight) {
1012                         flen += 3;      /* TO_SA to switch highlight. */
1013                         highlight = cell->highlight;
1014                 }
1015                 if (cell->f_color != f_color) {
1016                         flen += 3;      /* TO_SA to switch color. */
1017                         f_color = cell->f_color;
1018                 }
1019         }
1020         if (highlight != TAX_RESET)
1021                 flen += 3;      /* TO_SA to reset hightlight. */
1022         if (f_color != TAC_RESET)
1023                 flen += 3;      /* TO_SA to reset color. */
1024         if (line->len < tp->view.cols)
1025                 flen += 4;      /* Postfix (TO_RA). */
1026
1027         /* Find the line in the list. */
1028         i = tp->view.rows - 2 - line_nr;
1029         list_for_each_entry_reverse(s, &tp->lines, list)
1030                 if (--i <= 0)
1031                         break;
1032         /*
1033          * Check if the line needs to get reallocated.
1034          */
1035         if (s->len != flen) {
1036                 /* Reallocate string. */
1037                 n = tty3270_alloc_string(tp, flen);
1038                 list_add(&n->list, &s->list);
1039                 list_del_init(&s->list);
1040                 if (!list_empty(&s->update))
1041                         list_del_init(&s->update);
1042                 free_string(&tp->freemem, s);
1043                 s = n;
1044         }
1045
1046         /* Write 3270 data fragment. */
1047         cp = s->string;
1048         *cp++ = TO_SBA;
1049         *cp++ = 0;
1050         *cp++ = 0;
1051
1052         highlight = TAX_RESET;
1053         f_color = TAC_RESET;
1054         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1055                 if (cell->highlight != highlight) {
1056                         *cp++ = TO_SA;
1057                         *cp++ = TAT_EXTHI;
1058                         *cp++ = cell->highlight;
1059                         highlight = cell->highlight;
1060                 }
1061                 if (cell->f_color != f_color) {
1062                         *cp++ = TO_SA;
1063                         *cp++ = TAT_COLOR;
1064                         *cp++ = cell->f_color;
1065                         f_color = cell->f_color;
1066                 }
1067                 *cp++ = cell->character;
1068         }
1069         if (highlight != TAX_RESET) {
1070                 *cp++ = TO_SA;
1071                 *cp++ = TAT_EXTHI;
1072                 *cp++ = TAX_RESET;
1073         }
1074         if (f_color != TAC_RESET) {
1075                 *cp++ = TO_SA;
1076                 *cp++ = TAT_COLOR;
1077                 *cp++ = TAC_RESET;
1078         }
1079         if (line->len < tp->view.cols) {
1080                 *cp++ = TO_RA;
1081                 *cp++ = 0;
1082                 *cp++ = 0;
1083                 *cp++ = 0;
1084         }
1085
1086         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1087                 /* Line is currently visible on screen. */
1088                 tty3270_update_string(tp, s, line_nr);
1089                 /* Add line to update list. */
1090                 if (list_empty(&s->update)) {
1091                         list_add_tail(&s->update, &tp->update);
1092                         tp->update_flags |= TTY_UPDATE_LIST;
1093                 }
1094         }
1095 }
1096
1097 /*
1098  * Do carriage return.
1099  */
1100 static void
1101 tty3270_cr(struct tty3270 *tp)
1102 {
1103         tp->cx = 0;
1104 }
1105
1106 /*
1107  * Do line feed.
1108  */
1109 static void
1110 tty3270_lf(struct tty3270 *tp)
1111 {
1112         struct tty3270_line temp;
1113         int i;
1114
1115         tty3270_convert_line(tp, tp->cy);
1116         if (tp->cy < tp->view.rows - 3) {
1117                 tp->cy++;
1118                 return;
1119         }
1120         /* Last line just filled up. Add new, blank line. */
1121         tty3270_blank_line(tp);
1122         temp = tp->screen[0];
1123         temp.len = 0;
1124         for (i = 0; i < tp->view.rows - 3; i++)
1125                 tp->screen[i] = tp->screen[i+1];
1126         tp->screen[tp->view.rows - 3] = temp;
1127         tty3270_rebuild_update(tp);
1128 }
1129
1130 static void
1131 tty3270_ri(struct tty3270 *tp)
1132 {
1133         if (tp->cy > 0) {
1134             tty3270_convert_line(tp, tp->cy);
1135             tp->cy--;
1136         }
1137 }
1138
1139 /*
1140  * Insert characters at current position.
1141  */
1142 static void
1143 tty3270_insert_characters(struct tty3270 *tp, int n)
1144 {
1145         struct tty3270_line *line;
1146         int k;
1147
1148         line = tp->screen + tp->cy;
1149         while (line->len < tp->cx) {
1150                 line->cells[line->len].character = tp->view.ascebc[' '];
1151                 line->cells[line->len].highlight = TAX_RESET;
1152                 line->cells[line->len].f_color = TAC_RESET;
1153                 line->len++;
1154         }
1155         if (n > tp->view.cols - tp->cx)
1156                 n = tp->view.cols - tp->cx;
1157         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1158         while (k--)
1159                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1160         line->len += n;
1161         if (line->len > tp->view.cols)
1162                 line->len = tp->view.cols;
1163         while (n-- > 0) {
1164                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1165                 line->cells[tp->cx + n].highlight = tp->highlight;
1166                 line->cells[tp->cx + n].f_color = tp->f_color;
1167         }
1168 }
1169
1170 /*
1171  * Delete characters at current position.
1172  */
1173 static void
1174 tty3270_delete_characters(struct tty3270 *tp, int n)
1175 {
1176         struct tty3270_line *line;
1177         int i;
1178
1179         line = tp->screen + tp->cy;
1180         if (line->len <= tp->cx)
1181                 return;
1182         if (line->len - tp->cx <= n) {
1183                 line->len = tp->cx;
1184                 return;
1185         }
1186         for (i = tp->cx; i + n < line->len; i++)
1187                 line->cells[i] = line->cells[i + n];
1188         line->len -= n;
1189 }
1190
1191 /*
1192  * Erase characters at current position.
1193  */
1194 static void
1195 tty3270_erase_characters(struct tty3270 *tp, int n)
1196 {
1197         struct tty3270_line *line;
1198         struct tty3270_cell *cell;
1199
1200         line = tp->screen + tp->cy;
1201         while (line->len > tp->cx && n-- > 0) {
1202                 cell = line->cells + tp->cx++;
1203                 cell->character = ' ';
1204                 cell->highlight = TAX_RESET;
1205                 cell->f_color = TAC_RESET;
1206         }
1207         tp->cx += n;
1208         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1209 }
1210
1211 /*
1212  * Erase line, 3 different cases:
1213  *  Esc [ 0 K   Erase from current position to end of line inclusive
1214  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1215  *  Esc [ 2 K   Erase entire line (without moving cursor)
1216  */
1217 static void
1218 tty3270_erase_line(struct tty3270 *tp, int mode)
1219 {
1220         struct tty3270_line *line;
1221         struct tty3270_cell *cell;
1222         int i;
1223
1224         line = tp->screen + tp->cy;
1225         if (mode == 0)
1226                 line->len = tp->cx;
1227         else if (mode == 1) {
1228                 for (i = 0; i < tp->cx; i++) {
1229                         cell = line->cells + i;
1230                         cell->character = ' ';
1231                         cell->highlight = TAX_RESET;
1232                         cell->f_color = TAC_RESET;
1233                 }
1234                 if (line->len <= tp->cx)
1235                         line->len = tp->cx + 1;
1236         } else if (mode == 2)
1237                 line->len = 0;
1238         tty3270_convert_line(tp, tp->cy);
1239 }
1240
1241 /*
1242  * Erase display, 3 different cases:
1243  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1244  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1245  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1246  */
1247 static void
1248 tty3270_erase_display(struct tty3270 *tp, int mode)
1249 {
1250         int i;
1251
1252         if (mode == 0) {
1253                 tty3270_erase_line(tp, 0);
1254                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1255                         tp->screen[i].len = 0;
1256                         tty3270_convert_line(tp, i);
1257                 }
1258         } else if (mode == 1) {
1259                 for (i = 0; i < tp->cy; i++) {
1260                         tp->screen[i].len = 0;
1261                         tty3270_convert_line(tp, i);
1262                 }
1263                 tty3270_erase_line(tp, 1);
1264         } else if (mode == 2) {
1265                 for (i = 0; i < tp->view.rows - 2; i++) {
1266                         tp->screen[i].len = 0;
1267                         tty3270_convert_line(tp, i);
1268                 }
1269         }
1270         tty3270_rebuild_update(tp);
1271 }
1272
1273 /*
1274  * Set attributes found in an escape sequence.
1275  *  Esc [ <attr> ; <attr> ; ... m
1276  */
1277 static void
1278 tty3270_set_attributes(struct tty3270 *tp)
1279 {
1280         static unsigned char f_colors[] = {
1281                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1282                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1283         };
1284         int i, attr;
1285
1286         for (i = 0; i <= tp->esc_npar; i++) {
1287                 attr = tp->esc_par[i];
1288                 switch (attr) {
1289                 case 0:         /* Reset */
1290                         tp->highlight = TAX_RESET;
1291                         tp->f_color = TAC_RESET;
1292                         break;
1293                 /* Highlight. */
1294                 case 4:         /* Start underlining. */
1295                         tp->highlight = TAX_UNDER;
1296                         break;
1297                 case 5:         /* Start blink. */
1298                         tp->highlight = TAX_BLINK;
1299                         break;
1300                 case 7:         /* Start reverse. */
1301                         tp->highlight = TAX_REVER;
1302                         break;
1303                 case 24:        /* End underlining */
1304                         if (tp->highlight == TAX_UNDER)
1305                                 tp->highlight = TAX_RESET;
1306                         break;
1307                 case 25:        /* End blink. */
1308                         if (tp->highlight == TAX_BLINK)
1309                                 tp->highlight = TAX_RESET;
1310                         break;
1311                 case 27:        /* End reverse. */
1312                         if (tp->highlight == TAX_REVER)
1313                                 tp->highlight = TAX_RESET;
1314                         break;
1315                 /* Foreground color. */
1316                 case 30:        /* Black */
1317                 case 31:        /* Red */
1318                 case 32:        /* Green */
1319                 case 33:        /* Yellow */
1320                 case 34:        /* Blue */
1321                 case 35:        /* Magenta */
1322                 case 36:        /* Cyan */
1323                 case 37:        /* White */
1324                 case 39:        /* Black */
1325                         tp->f_color = f_colors[attr - 30];
1326                         break;
1327                 }
1328         }
1329 }
1330
1331 static inline int
1332 tty3270_getpar(struct tty3270 *tp, int ix)
1333 {
1334         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1335 }
1336
1337 static void
1338 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1339 {
1340         int max_cx = max(0, cx);
1341         int max_cy = max(0, cy);
1342
1343         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1344         cy = min_t(int, tp->view.rows - 3, max_cy);
1345         if (cy != tp->cy) {
1346                 tty3270_convert_line(tp, tp->cy);
1347                 tp->cy = cy;
1348         }
1349 }
1350
1351 /*
1352  * Process escape sequences. Known sequences:
1353  *  Esc 7                       Save Cursor Position
1354  *  Esc 8                       Restore Cursor Position
1355  *  Esc [ Pn ; Pn ; .. m        Set attributes
1356  *  Esc [ Pn ; Pn H             Cursor Position
1357  *  Esc [ Pn ; Pn f             Cursor Position
1358  *  Esc [ Pn A                  Cursor Up
1359  *  Esc [ Pn B                  Cursor Down
1360  *  Esc [ Pn C                  Cursor Forward
1361  *  Esc [ Pn D                  Cursor Backward
1362  *  Esc [ Pn G                  Cursor Horizontal Absolute
1363  *  Esc [ Pn X                  Erase Characters
1364  *  Esc [ Ps J                  Erase in Display
1365  *  Esc [ Ps K                  Erase in Line
1366  * // FIXME: add all the new ones.
1367  *
1368  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1369  *  Ps is a selective parameter.
1370  */
1371 static void
1372 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1373 {
1374         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1375
1376         if (tp->esc_state == ESnormal) {
1377                 if (ch == 0x1b)
1378                         /* Starting new escape sequence. */
1379                         tp->esc_state = ESesc;
1380                 return;
1381         }
1382         if (tp->esc_state == ESesc) {
1383                 tp->esc_state = ESnormal;
1384                 switch (ch) {
1385                 case '[':
1386                         tp->esc_state = ESsquare;
1387                         break;
1388                 case 'E':
1389                         tty3270_cr(tp);
1390                         tty3270_lf(tp);
1391                         break;
1392                 case 'M':
1393                         tty3270_ri(tp);
1394                         break;
1395                 case 'D':
1396                         tty3270_lf(tp);
1397                         break;
1398                 case 'Z':               /* Respond ID. */
1399                         kbd_puts_queue(tp->tty, "\033[?6c");
1400                         break;
1401                 case '7':               /* Save cursor position. */
1402                         tp->saved_cx = tp->cx;
1403                         tp->saved_cy = tp->cy;
1404                         tp->saved_highlight = tp->highlight;
1405                         tp->saved_f_color = tp->f_color;
1406                         break;
1407                 case '8':               /* Restore cursor position. */
1408                         tty3270_convert_line(tp, tp->cy);
1409                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1410                         tp->highlight = tp->saved_highlight;
1411                         tp->f_color = tp->saved_f_color;
1412                         break;
1413                 case 'c':               /* Reset terminal. */
1414                         tp->cx = tp->saved_cx = 0;
1415                         tp->cy = tp->saved_cy = 0;
1416                         tp->highlight = tp->saved_highlight = TAX_RESET;
1417                         tp->f_color = tp->saved_f_color = TAC_RESET;
1418                         tty3270_erase_display(tp, 2);
1419                         break;
1420                 }
1421                 return;
1422         }
1423         if (tp->esc_state == ESsquare) {
1424                 tp->esc_state = ESgetpars;
1425                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1426                 tp->esc_npar = 0;
1427                 tp->esc_ques = (ch == '?');
1428                 if (tp->esc_ques)
1429                         return;
1430         }
1431         if (tp->esc_state == ESgetpars) {
1432                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1433                         tp->esc_npar++;
1434                         return;
1435                 }
1436                 if (ch >= '0' && ch <= '9') {
1437                         tp->esc_par[tp->esc_npar] *= 10;
1438                         tp->esc_par[tp->esc_npar] += ch - '0';
1439                         return;
1440                 }
1441         }
1442         tp->esc_state = ESnormal;
1443         if (ch == 'n' && !tp->esc_ques) {
1444                 if (tp->esc_par[0] == 5)                /* Status report. */
1445                         kbd_puts_queue(tp->tty, "\033[0n");
1446                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1447                         char buf[40];
1448                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1449                         kbd_puts_queue(tp->tty, buf);
1450                 }
1451                 return;
1452         }
1453         if (tp->esc_ques)
1454                 return;
1455         switch (ch) {
1456         case 'm':
1457                 tty3270_set_attributes(tp);
1458                 break;
1459         case 'H':       /* Set cursor position. */
1460         case 'f':
1461                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1462                                 tty3270_getpar(tp, 0) - 1);
1463                 break;
1464         case 'd':       /* Set y position. */
1465                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1466                 break;
1467         case 'A':       /* Cursor up. */
1468         case 'F':
1469                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1470                 break;
1471         case 'B':       /* Cursor down. */
1472         case 'e':
1473         case 'E':
1474                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1475                 break;
1476         case 'C':       /* Cursor forward. */
1477         case 'a':
1478                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1479                 break;
1480         case 'D':       /* Cursor backward. */
1481                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1482                 break;
1483         case 'G':       /* Set x position. */
1484         case '`':
1485                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1486                 break;
1487         case 'X':       /* Erase Characters. */
1488                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1489                 break;
1490         case 'J':       /* Erase display. */
1491                 tty3270_erase_display(tp, tp->esc_par[0]);
1492                 break;
1493         case 'K':       /* Erase line. */
1494                 tty3270_erase_line(tp, tp->esc_par[0]);
1495                 break;
1496         case 'P':       /* Delete characters. */
1497                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1498                 break;
1499         case '@':       /* Insert characters. */
1500                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1501                 break;
1502         case 's':       /* Save cursor position. */
1503                 tp->saved_cx = tp->cx;
1504                 tp->saved_cy = tp->cy;
1505                 tp->saved_highlight = tp->highlight;
1506                 tp->saved_f_color = tp->f_color;
1507                 break;
1508         case 'u':       /* Restore cursor position. */
1509                 tty3270_convert_line(tp, tp->cy);
1510                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1511                 tp->highlight = tp->saved_highlight;
1512                 tp->f_color = tp->saved_f_color;
1513                 break;
1514         }
1515 }
1516
1517 /*
1518  * String write routine for 3270 ttys
1519  */
1520 static void
1521 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1522 {
1523         int i_msg, i;
1524
1525         spin_lock_bh(&tp->view.lock);
1526         for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1527                 if (tp->esc_state != 0) {
1528                         /* Continue escape sequence. */
1529                         tty3270_escape_sequence(tp, buf[i_msg]);
1530                         continue;
1531                 }
1532
1533                 switch (buf[i_msg]) {
1534                 case 0x07:              /* '\a' -- Alarm */
1535                         tp->wcc |= TW_PLUSALARM;
1536                         break;
1537                 case 0x08:              /* Backspace. */
1538                         if (tp->cx > 0) {
1539                                 tp->cx--;
1540                                 tty3270_put_character(tp, ' ');
1541                         }
1542                         break;
1543                 case 0x09:              /* '\t' -- Tabulate */
1544                         for (i = tp->cx % 8; i < 8; i++) {
1545                                 if (tp->cx >= tp->view.cols) {
1546                                         tty3270_cr(tp);
1547                                         tty3270_lf(tp);
1548                                         break;
1549                                 }
1550                                 tty3270_put_character(tp, ' ');
1551                                 tp->cx++;
1552                         }
1553                         break;
1554                 case 0x0a:              /* '\n' -- New Line */
1555                         tty3270_cr(tp);
1556                         tty3270_lf(tp);
1557                         break;
1558                 case 0x0c:              /* '\f' -- Form Feed */
1559                         tty3270_erase_display(tp, 2);
1560                         tp->cx = tp->cy = 0;
1561                         break;
1562                 case 0x0d:              /* '\r' -- Carriage Return */
1563                         tp->cx = 0;
1564                         break;
1565                 case 0x0f:              /* SuSE "exit alternate mode" */
1566                         break;
1567                 case 0x1b:              /* Start escape sequence. */
1568                         tty3270_escape_sequence(tp, buf[i_msg]);
1569                         break;
1570                 default:                /* Insert normal character. */
1571                         if (tp->cx >= tp->view.cols) {
1572                                 tty3270_cr(tp);
1573                                 tty3270_lf(tp);
1574                         }
1575                         tty3270_put_character(tp, buf[i_msg]);
1576                         tp->cx++;
1577                         break;
1578                 }
1579         }
1580         /* Convert current line to 3270 data fragment. */
1581         tty3270_convert_line(tp, tp->cy);
1582
1583         /* Setup timer to update display after 1/10 second */
1584         if (!timer_pending(&tp->timer))
1585                 tty3270_set_timer(tp, HZ/10);
1586
1587         spin_unlock_bh(&tp->view.lock);
1588 }
1589
1590 /*
1591  * String write routine for 3270 ttys
1592  */
1593 static int
1594 tty3270_write(struct tty_struct * tty,
1595               const unsigned char *buf, int count)
1596 {
1597         struct tty3270 *tp;
1598
1599         tp = tty->driver_data;
1600         if (!tp)
1601                 return 0;
1602         if (tp->char_count > 0) {
1603                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1604                 tp->char_count = 0;
1605         }
1606         tty3270_do_write(tp, buf, count);
1607         return count;
1608 }
1609
1610 /*
1611  * Put single characters to the ttys character buffer
1612  */
1613 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1614 {
1615         struct tty3270 *tp;
1616
1617         tp = tty->driver_data;
1618         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1619                 return 0;
1620         tp->char_buf[tp->char_count++] = ch;
1621         return 1;
1622 }
1623
1624 /*
1625  * Flush all characters from the ttys characeter buffer put there
1626  * by tty3270_put_char.
1627  */
1628 static void
1629 tty3270_flush_chars(struct tty_struct *tty)
1630 {
1631         struct tty3270 *tp;
1632
1633         tp = tty->driver_data;
1634         if (!tp)
1635                 return;
1636         if (tp->char_count > 0) {
1637                 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1638                 tp->char_count = 0;
1639         }
1640 }
1641
1642 /*
1643  * Returns the number of characters in the output buffer. This is
1644  * used in tty_wait_until_sent to wait until all characters have
1645  * appeared on the screen.
1646  */
1647 static int
1648 tty3270_chars_in_buffer(struct tty_struct *tty)
1649 {
1650         return 0;
1651 }
1652
1653 static void
1654 tty3270_flush_buffer(struct tty_struct *tty)
1655 {
1656 }
1657
1658 /*
1659  * Check for visible/invisible input switches
1660  */
1661 static void
1662 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1663 {
1664         struct tty3270 *tp;
1665         int new;
1666
1667         tp = tty->driver_data;
1668         if (!tp)
1669                 return;
1670         spin_lock_bh(&tp->view.lock);
1671         if (L_ICANON(tty)) {
1672                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1673                 if (new != tp->inattr) {
1674                         tp->inattr = new;
1675                         tty3270_update_prompt(tp, NULL, 0);
1676                         tty3270_set_timer(tp, 1);
1677                 }
1678         }
1679         spin_unlock_bh(&tp->view.lock);
1680 }
1681
1682 /*
1683  * Disable reading from a 3270 tty
1684  */
1685 static void
1686 tty3270_throttle(struct tty_struct * tty)
1687 {
1688         struct tty3270 *tp;
1689
1690         tp = tty->driver_data;
1691         if (!tp)
1692                 return;
1693         tp->throttle = 1;
1694 }
1695
1696 /*
1697  * Enable reading from a 3270 tty
1698  */
1699 static void
1700 tty3270_unthrottle(struct tty_struct * tty)
1701 {
1702         struct tty3270 *tp;
1703
1704         tp = tty->driver_data;
1705         if (!tp)
1706                 return;
1707         tp->throttle = 0;
1708         if (tp->attn)
1709                 tty3270_issue_read(tp, 1);
1710 }
1711
1712 /*
1713  * Hang up the tty device.
1714  */
1715 static void
1716 tty3270_hangup(struct tty_struct *tty)
1717 {
1718         // FIXME: implement
1719 }
1720
1721 static void
1722 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1723 {
1724 }
1725
1726 static int
1727 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1728               unsigned int cmd, unsigned long arg)
1729 {
1730         struct tty3270 *tp;
1731
1732         tp = tty->driver_data;
1733         if (!tp)
1734                 return -ENODEV;
1735         if (tty->flags & (1 << TTY_IO_ERROR))
1736                 return -EIO;
1737         return kbd_ioctl(tp->kbd, file, cmd, arg);
1738 }
1739
1740 static const struct tty_operations tty3270_ops = {
1741         .open = tty3270_open,
1742         .close = tty3270_close,
1743         .write = tty3270_write,
1744         .put_char = tty3270_put_char,
1745         .flush_chars = tty3270_flush_chars,
1746         .write_room = tty3270_write_room,
1747         .chars_in_buffer = tty3270_chars_in_buffer,
1748         .flush_buffer = tty3270_flush_buffer,
1749         .throttle = tty3270_throttle,
1750         .unthrottle = tty3270_unthrottle,
1751         .hangup = tty3270_hangup,
1752         .wait_until_sent = tty3270_wait_until_sent,
1753         .ioctl = tty3270_ioctl,
1754         .set_termios = tty3270_set_termios
1755 };
1756
1757 static void tty3270_notifier(int index, int active)
1758 {
1759         if (active)
1760                 tty_register_device(tty3270_driver, index, NULL);
1761         else
1762                 tty_unregister_device(tty3270_driver, index);
1763 }
1764
1765 /*
1766  * 3270 tty registration code called from tty_init().
1767  * Most kernel services (incl. kmalloc) are available at this poimt.
1768  */
1769 static int __init tty3270_init(void)
1770 {
1771         struct tty_driver *driver;
1772         int ret;
1773
1774         driver = alloc_tty_driver(RAW3270_MAXDEVS);
1775         if (!driver)
1776                 return -ENOMEM;
1777
1778         /*
1779          * Initialize the tty_driver structure
1780          * Entries in tty3270_driver that are NOT initialized:
1781          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1782          */
1783         driver->owner = THIS_MODULE;
1784         driver->driver_name = "ttyTUB";
1785         driver->name = "ttyTUB";
1786         driver->major = IBM_TTY3270_MAJOR;
1787         driver->minor_start = RAW3270_FIRSTMINOR;
1788         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1789         driver->subtype = SYSTEM_TYPE_TTY;
1790         driver->init_termios = tty_std_termios;
1791         driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV;
1792         tty_set_operations(driver, &tty3270_ops);
1793         ret = tty_register_driver(driver);
1794         if (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                 put_tty_driver(driver);
1802                 return ret;
1803
1804         }
1805         return 0;
1806 }
1807
1808 static void __exit
1809 tty3270_exit(void)
1810 {
1811         struct tty_driver *driver;
1812
1813         raw3270_unregister_notifier(tty3270_notifier);
1814         driver = tty3270_driver;
1815         tty3270_driver = NULL;
1816         tty_unregister_driver(driver);
1817         tty3270_del_views();
1818 }
1819
1820 MODULE_LICENSE("GPL");
1821 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1822
1823 module_init(tty3270_init);
1824 module_exit(tty3270_exit);