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