482ee028f842032337186c33775471103e61b969
[linux-3.10.git] / drivers / s390 / char / tty3270.c
1 /*
2  *    IBM/3270 Driver - tty functions.
3  *
4  *  Author(s):
5  *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
6  *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
7  *      -- Copyright IBM Corp. 2003
8  */
9
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/kdev_t.h>
13 #include <linux/tty.h>
14 #include <linux/vt_kern.h>
15 #include <linux/init.h>
16 #include <linux/console.h>
17 #include <linux/interrupt.h>
18
19 #include <linux/slab.h>
20 #include <linux/bootmem.h>
21 #include <linux/compat.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_port port;
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          16      /* Recreate screen. */
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                 del_timer(&tp->timer);
126         else
127                 mod_timer(&tp->timer, jiffies + expires);
128 }
129
130 /*
131  * The input line are the two last lines of the screen.
132  */
133 static void
134 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
135 {
136         struct string *line;
137         unsigned int off;
138
139         line = tp->prompt;
140         if (count != 0)
141                 line->string[5] = TF_INMDT;
142         else
143                 line->string[5] = tp->inattr;
144         if (count > tp->view.cols * 2 - 11)
145                 count = tp->view.cols * 2 - 11;
146         memcpy(line->string + 6, input, count);
147         line->string[6 + count] = TO_IC;
148         /* Clear to end of input line. */
149         if (count < tp->view.cols * 2 - 11) {
150                 line->string[7 + count] = TO_RA;
151                 line->string[10 + count] = 0;
152                 off = tp->view.cols * tp->view.rows - 9;
153                 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
154                 line->len = 11 + count;
155         } else
156                 line->len = 7 + count;
157         tp->update_flags |= TTY_UPDATE_INPUT;
158 }
159
160 static void
161 tty3270_create_prompt(struct tty3270 *tp)
162 {
163         static const unsigned char blueprint[] =
164                 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
165                   /* empty input string */
166                   TO_IC, TO_RA, 0, 0, 0 };
167         struct string *line;
168         unsigned int offset;
169
170         line = alloc_string(&tp->freemem,
171                             sizeof(blueprint) + tp->view.cols * 2 - 9);
172         tp->prompt = line;
173         tp->inattr = TF_INPUT;
174         /* Copy blueprint to status line */
175         memcpy(line->string, blueprint, sizeof(blueprint));
176         line->len = sizeof(blueprint);
177         /* Set output offsets. */
178         offset = tp->view.cols * (tp->view.rows - 2);
179         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
180         offset = tp->view.cols * tp->view.rows - 9;
181         raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
182
183         /* Allocate input string for reading. */
184         tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
185 }
186
187 /*
188  * The status line is the last line of the screen. It shows the string
189  * "Running"/"Holding" in the lower right corner of the screen.
190  */
191 static void
192 tty3270_update_status(struct tty3270 * tp)
193 {
194         char *str;
195
196         str = (tp->nr_up != 0) ? "History" : "Running";
197         memcpy(tp->status->string + 8, str, 7);
198         codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
199         tp->update_flags |= TTY_UPDATE_STATUS;
200 }
201
202 static void
203 tty3270_create_status(struct tty3270 * tp)
204 {
205         static const unsigned char blueprint[] =
206                 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
207                   0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
208                   TAC_RESET };
209         struct string *line;
210         unsigned int offset;
211
212         line = alloc_string(&tp->freemem,sizeof(blueprint));
213         tp->status = line;
214         /* Copy blueprint to status line */
215         memcpy(line->string, blueprint, sizeof(blueprint));
216         /* Set address to start of status string (= last 9 characters). */
217         offset = tp->view.cols * tp->view.rows - 9;
218         raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
219 }
220
221 /*
222  * Set output offsets to 3270 datastream fragment of a tty string.
223  * (TO_SBA offset at the start and TO_RA offset at the end of the string)
224  */
225 static void
226 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
227 {
228         unsigned char *cp;
229
230         raw3270_buffer_address(tp->view.dev, line->string + 1,
231                                tp->view.cols * nr);
232         cp = line->string + line->len - 4;
233         if (*cp == TO_RA)
234                 raw3270_buffer_address(tp->view.dev, cp + 1,
235                                        tp->view.cols * (nr + 1));
236 }
237
238 /*
239  * Rebuild update list to print all lines.
240  */
241 static void
242 tty3270_rebuild_update(struct tty3270 *tp)
243 {
244         struct string *s, *n;
245         int line, nr_up;
246
247         /* 
248          * Throw away update list and create a new one,
249          * containing all lines that will fit on the screen.
250          */
251         list_for_each_entry_safe(s, n, &tp->update, update)
252                 list_del_init(&s->update);
253         line = tp->view.rows - 3;
254         nr_up = tp->nr_up;
255         list_for_each_entry_reverse(s, &tp->lines, list) {
256                 if (nr_up > 0) {
257                         nr_up--;
258                         continue;
259                 }
260                 tty3270_update_string(tp, s, line);
261                 list_add(&s->update, &tp->update);
262                 if (--line < 0)
263                         break;
264         }
265         tp->update_flags |= TTY_UPDATE_LIST;
266 }
267
268 /*
269  * Alloc string for size bytes. If there is not enough room in
270  * freemem, free strings until there is room.
271  */
272 static struct string *
273 tty3270_alloc_string(struct tty3270 *tp, size_t size)
274 {
275         struct string *s, *n;
276
277         s = alloc_string(&tp->freemem, size);
278         if (s)
279                 return s;
280         list_for_each_entry_safe(s, n, &tp->lines, list) {
281                 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
282                 list_del(&s->list);
283                 if (!list_empty(&s->update))
284                         list_del(&s->update);
285                 tp->nr_lines--;
286                 if (free_string(&tp->freemem, s) >= size)
287                         break;
288         }
289         s = alloc_string(&tp->freemem, size);
290         BUG_ON(!s);
291         if (tp->nr_up != 0 &&
292             tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
293                 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
294                 tty3270_rebuild_update(tp);
295                 tty3270_update_status(tp);
296         }
297         return s;
298 }
299
300 /*
301  * Add an empty line to the list.
302  */
303 static void
304 tty3270_blank_line(struct tty3270 *tp)
305 {
306         static const unsigned char blueprint[] =
307                 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
308                   TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
309         struct string *s;
310
311         s = tty3270_alloc_string(tp, sizeof(blueprint));
312         memcpy(s->string, blueprint, sizeof(blueprint));
313         s->len = sizeof(blueprint);
314         list_add_tail(&s->list, &tp->lines);
315         tp->nr_lines++;
316         if (tp->nr_up != 0)
317                 tp->nr_up++;
318 }
319
320 /*
321  * Write request completion callback.
322  */
323 static void
324 tty3270_write_callback(struct raw3270_request *rq, void *data)
325 {
326         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
327
328         if (rq->rc != 0) {
329                 /* Write wasn't successful. Refresh all. */
330                 tp->update_flags = TTY_UPDATE_ALL;
331                 tty3270_set_timer(tp, 1);
332         }
333         raw3270_request_reset(rq);
334         xchg(&tp->write, rq);
335 }
336
337 /*
338  * Update 3270 display.
339  */
340 static void
341 tty3270_update(struct tty3270 *tp)
342 {
343         static char invalid_sba[2] = { 0xff, 0xff };
344         struct raw3270_request *wrq;
345         unsigned long updated;
346         struct string *s, *n;
347         char *sba, *str;
348         int rc, len;
349
350         wrq = xchg(&tp->write, 0);
351         if (!wrq) {
352                 tty3270_set_timer(tp, 1);
353                 return;
354         }
355
356         spin_lock(&tp->view.lock);
357         updated = 0;
358         if (tp->update_flags & TTY_UPDATE_ALL) {
359                 tty3270_rebuild_update(tp);
360                 tty3270_update_status(tp);
361                 tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
362                         TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
363         }
364         if (tp->update_flags & TTY_UPDATE_ERASE) {
365                 /* Use erase write alternate to erase display. */
366                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
367                 updated |= TTY_UPDATE_ERASE;
368         } else
369                 raw3270_request_set_cmd(wrq, TC_WRITE);
370
371         raw3270_request_add_data(wrq, &tp->wcc, 1);
372         tp->wcc = TW_NONE;
373
374         /*
375          * Update status line.
376          */
377         if (tp->update_flags & TTY_UPDATE_STATUS)
378                 if (raw3270_request_add_data(wrq, tp->status->string,
379                                              tp->status->len) == 0)
380                         updated |= TTY_UPDATE_STATUS;
381
382         /*
383          * Write input line.
384          */
385         if (tp->update_flags & TTY_UPDATE_INPUT)
386                 if (raw3270_request_add_data(wrq, tp->prompt->string,
387                                              tp->prompt->len) == 0)
388                         updated |= TTY_UPDATE_INPUT;
389
390         sba = invalid_sba;
391         
392         if (tp->update_flags & TTY_UPDATE_LIST) {
393                 /* Write strings in the update list to the screen. */
394                 list_for_each_entry_safe(s, n, &tp->update, update) {
395                         str = s->string;
396                         len = s->len;
397                         /*
398                          * Skip TO_SBA at the start of the string if the
399                          * last output position matches the start address
400                          * of this line.
401                          */
402                         if (s->string[1] == sba[0] && s->string[2] == sba[1])
403                                 str += 3, len -= 3;
404                         if (raw3270_request_add_data(wrq, str, len) != 0)
405                                 break;
406                         list_del_init(&s->update);
407                         sba = s->string + s->len - 3;
408                 }
409                 if (list_empty(&tp->update))
410                         updated |= TTY_UPDATE_LIST;
411         }
412         wrq->callback = tty3270_write_callback;
413         rc = raw3270_start(&tp->view, wrq);
414         if (rc == 0) {
415                 tp->update_flags &= ~updated;
416                 if (tp->update_flags)
417                         tty3270_set_timer(tp, 1);
418         } else {
419                 raw3270_request_reset(wrq);
420                 xchg(&tp->write, wrq);
421         }
422         spin_unlock(&tp->view.lock);
423 }
424
425 /*
426  * Command recalling.
427  */
428 static void
429 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
430 {
431         struct string *s;
432
433         tp->rcl_walk = NULL;
434         if (len <= 0)
435                 return;
436         if (tp->rcl_nr >= tp->rcl_max) {
437                 s = list_entry(tp->rcl_lines.next, struct string, list);
438                 list_del(&s->list);
439                 free_string(&tp->freemem, s);
440                 tp->rcl_nr--;
441         }
442         s = tty3270_alloc_string(tp, len);
443         memcpy(s->string, input, len);
444         list_add_tail(&s->list, &tp->rcl_lines);
445         tp->rcl_nr++;
446 }
447
448 static void
449 tty3270_rcl_backward(struct kbd_data *kbd)
450 {
451         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
452         struct string *s;
453
454         spin_lock_bh(&tp->view.lock);
455         if (tp->inattr == TF_INPUT) {
456                 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
457                         tp->rcl_walk = tp->rcl_walk->prev;
458                 else if (!list_empty(&tp->rcl_lines))
459                         tp->rcl_walk = tp->rcl_lines.prev;
460                 s = tp->rcl_walk ? 
461                         list_entry(tp->rcl_walk, struct string, list) : NULL;
462                 if (tp->rcl_walk) {
463                         s = list_entry(tp->rcl_walk, struct string, list);
464                         tty3270_update_prompt(tp, s->string, s->len);
465                 } else
466                         tty3270_update_prompt(tp, NULL, 0);
467                 tty3270_set_timer(tp, 1);
468         }
469         spin_unlock_bh(&tp->view.lock);
470 }
471
472 /*
473  * Deactivate tty view.
474  */
475 static void
476 tty3270_exit_tty(struct kbd_data *kbd)
477 {
478         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
479
480         raw3270_deactivate_view(&tp->view);
481 }
482
483 /*
484  * Scroll forward in history.
485  */
486 static void
487 tty3270_scroll_forward(struct kbd_data *kbd)
488 {
489         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
490         int nr_up;
491
492         spin_lock_bh(&tp->view.lock);
493         nr_up = tp->nr_up - tp->view.rows + 2;
494         if (nr_up < 0)
495                 nr_up = 0;
496         if (nr_up != tp->nr_up) {
497                 tp->nr_up = nr_up;
498                 tty3270_rebuild_update(tp);
499                 tty3270_update_status(tp);
500                 tty3270_set_timer(tp, 1);
501         }
502         spin_unlock_bh(&tp->view.lock);
503 }
504
505 /*
506  * Scroll backward in history.
507  */
508 static void
509 tty3270_scroll_backward(struct kbd_data *kbd)
510 {
511         struct tty3270 *tp = container_of(kbd->port, struct tty3270, port);
512         int nr_up;
513
514         spin_lock_bh(&tp->view.lock);
515         nr_up = tp->nr_up + tp->view.rows - 2;
516         if (nr_up + tp->view.rows - 2 > tp->nr_lines)
517                 nr_up = tp->nr_lines - tp->view.rows + 2;
518         if (nr_up != tp->nr_up) {
519                 tp->nr_up = nr_up;
520                 tty3270_rebuild_update(tp);
521                 tty3270_update_status(tp);
522                 tty3270_set_timer(tp, 1);
523         }
524         spin_unlock_bh(&tp->view.lock);
525 }
526
527 /*
528  * Pass input line to tty.
529  */
530 static void
531 tty3270_read_tasklet(struct raw3270_request *rrq)
532 {
533         static char kreset_data = TW_KR;
534         struct tty3270 *tp = container_of(rrq->view, struct tty3270, view);
535         char *input;
536         int len;
537
538         spin_lock_bh(&tp->view.lock);
539         /*
540          * Two AID keys are special: For 0x7d (enter) the input line
541          * has to be emitted to the tty and for 0x6d the screen
542          * needs to be redrawn.
543          */
544         input = NULL;
545         len = 0;
546         if (tp->input->string[0] == 0x7d) {
547                 /* Enter: write input to tty. */
548                 input = tp->input->string + 6;
549                 len = tp->input->len - 6 - rrq->rescnt;
550                 if (tp->inattr != TF_INPUTN)
551                         tty3270_rcl_add(tp, input, len);
552                 if (tp->nr_up > 0) {
553                         tp->nr_up = 0;
554                         tty3270_rebuild_update(tp);
555                         tty3270_update_status(tp);
556                 }
557                 /* Clear input area. */
558                 tty3270_update_prompt(tp, NULL, 0);
559                 tty3270_set_timer(tp, 1);
560         } else if (tp->input->string[0] == 0x6d) {
561                 /* Display has been cleared. Redraw. */
562                 tp->update_flags = TTY_UPDATE_ALL;
563                 tty3270_set_timer(tp, 1);
564         }
565         spin_unlock_bh(&tp->view.lock);
566
567         /* Start keyboard reset command. */
568         raw3270_request_reset(tp->kreset);
569         raw3270_request_set_cmd(tp->kreset, TC_WRITE);
570         raw3270_request_add_data(tp->kreset, &kreset_data, 1);
571         raw3270_start(&tp->view, tp->kreset);
572
573         while (len-- > 0)
574                 kbd_keycode(tp->kbd, *input++);
575         /* Emit keycode for AID byte. */
576         kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
577
578         raw3270_request_reset(rrq);
579         xchg(&tp->read, rrq);
580         raw3270_put_view(&tp->view);
581 }
582
583 /*
584  * Read request completion callback.
585  */
586 static void
587 tty3270_read_callback(struct raw3270_request *rq, void *data)
588 {
589         struct tty3270 *tp = container_of(rq->view, struct tty3270, view);
590         raw3270_get_view(rq->view);
591         /* Schedule tasklet to pass input to tty. */
592         tasklet_schedule(&tp->readlet);
593 }
594
595 /*
596  * Issue a read request. Call with device lock.
597  */
598 static void
599 tty3270_issue_read(struct tty3270 *tp, int lock)
600 {
601         struct raw3270_request *rrq;
602         int rc;
603
604         rrq = xchg(&tp->read, 0);
605         if (!rrq)
606                 /* Read already scheduled. */
607                 return;
608         rrq->callback = tty3270_read_callback;
609         rrq->callback_data = tp;
610         raw3270_request_set_cmd(rrq, TC_READMOD);
611         raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
612         /* Issue the read modified request. */
613         if (lock) {
614                 rc = raw3270_start(&tp->view, rrq);
615         } else
616                 rc = raw3270_start_irq(&tp->view, rrq);
617         if (rc) {
618                 raw3270_request_reset(rrq);
619                 xchg(&tp->read, rrq);
620         }
621 }
622
623 /*
624  * Switch to the tty view.
625  */
626 static int
627 tty3270_activate(struct raw3270_view *view)
628 {
629         struct tty3270 *tp = container_of(view, struct tty3270, view);
630
631         tp->update_flags = TTY_UPDATE_ALL;
632         tty3270_set_timer(tp, 1);
633         return 0;
634 }
635
636 static void
637 tty3270_deactivate(struct raw3270_view *view)
638 {
639         struct tty3270 *tp = container_of(view, struct tty3270, view);
640
641         del_timer(&tp->timer);
642 }
643
644 static int
645 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
646 {
647         /* Handle ATTN. Schedule tasklet to read aid. */
648         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
649                 if (!tp->throttle)
650                         tty3270_issue_read(tp, 0);
651                 else
652                         tp->attn = 1;
653         }
654
655         if (rq) {
656                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
657                         rq->rc = -EIO;
658                 else
659                         /* Normal end. Copy residual count. */
660                         rq->rescnt = irb->scsw.cmd.count;
661         }
662         return RAW3270_IO_DONE;
663 }
664
665 /*
666  * Allocate tty3270 structure.
667  */
668 static struct tty3270 *
669 tty3270_alloc_view(void)
670 {
671         struct tty3270 *tp;
672         int pages;
673
674         tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
675         if (!tp)
676                 goto out_err;
677         tp->freemem_pages =
678                 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
679         if (!tp->freemem_pages)
680                 goto out_tp;
681         INIT_LIST_HEAD(&tp->freemem);
682         INIT_LIST_HEAD(&tp->lines);
683         INIT_LIST_HEAD(&tp->update);
684         INIT_LIST_HEAD(&tp->rcl_lines);
685         tp->rcl_max = 20;
686         tty_port_init(&tp->port);
687         setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update,
688                     (unsigned long) tp);
689         tasklet_init(&tp->readlet,
690                      (void (*)(unsigned long)) tty3270_read_tasklet,
691                      (unsigned long) tp->read);
692
693         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) {
694                 tp->freemem_pages[pages] = (void *)
695                         __get_free_pages(GFP_KERNEL|GFP_DMA, 0);
696                 if (!tp->freemem_pages[pages])
697                         goto out_pages;
698                 add_string_memory(&tp->freemem,
699                                   tp->freemem_pages[pages], PAGE_SIZE);
700         }
701         tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE);
702         if (IS_ERR(tp->write))
703                 goto out_pages;
704         tp->read = raw3270_request_alloc(0);
705         if (IS_ERR(tp->read))
706                 goto out_write;
707         tp->kreset = raw3270_request_alloc(1);
708         if (IS_ERR(tp->kreset))
709                 goto out_read;
710         tp->kbd = kbd_alloc();
711         if (!tp->kbd)
712                 goto out_reset;
713         return tp;
714
715 out_reset:
716         raw3270_request_free(tp->kreset);
717 out_read:
718         raw3270_request_free(tp->read);
719 out_write:
720         raw3270_request_free(tp->write);
721 out_pages:
722         while (pages--)
723                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
724         kfree(tp->freemem_pages);
725 out_tp:
726         kfree(tp);
727 out_err:
728         return ERR_PTR(-ENOMEM);
729 }
730
731 /*
732  * Free tty3270 structure.
733  */
734 static void
735 tty3270_free_view(struct tty3270 *tp)
736 {
737         int pages;
738
739         del_timer_sync(&tp->timer);
740         kbd_free(tp->kbd);
741         raw3270_request_free(tp->kreset);
742         raw3270_request_free(tp->read);
743         raw3270_request_free(tp->write);
744         for (pages = 0; pages < TTY3270_STRING_PAGES; pages++)
745                 free_pages((unsigned long) tp->freemem_pages[pages], 0);
746         kfree(tp->freemem_pages);
747         kfree(tp);
748 }
749
750 /*
751  * Allocate tty3270 screen.
752  */
753 static int
754 tty3270_alloc_screen(struct tty3270 *tp)
755 {
756         unsigned long size;
757         int lines;
758
759         size = sizeof(struct tty3270_line) * (tp->view.rows - 2);
760         tp->screen = kzalloc(size, GFP_KERNEL);
761         if (!tp->screen)
762                 goto out_err;
763         for (lines = 0; lines < tp->view.rows - 2; lines++) {
764                 size = sizeof(struct tty3270_cell) * tp->view.cols;
765                 tp->screen[lines].cells = kzalloc(size, GFP_KERNEL);
766                 if (!tp->screen[lines].cells)
767                         goto out_screen;
768         }
769         return 0;
770 out_screen:
771         while (lines--)
772                 kfree(tp->screen[lines].cells);
773         kfree(tp->screen);
774 out_err:
775         return -ENOMEM;
776 }
777
778 /*
779  * Free tty3270 screen.
780  */
781 static void
782 tty3270_free_screen(struct tty3270 *tp)
783 {
784         int lines;
785
786         for (lines = 0; lines < tp->view.rows - 2; lines++)
787                 kfree(tp->screen[lines].cells);
788         kfree(tp->screen);
789 }
790
791 /*
792  * Unlink tty3270 data structure from tty.
793  */
794 static void
795 tty3270_release(struct raw3270_view *view)
796 {
797         struct tty3270 *tp = container_of(view, struct tty3270, view);
798         struct tty_struct *tty = tty_port_tty_get(&tp->port);
799
800         if (tty) {
801                 tty->driver_data = NULL;
802                 tty_port_tty_set(&tp->port, NULL);
803                 tty_hangup(tty);
804                 raw3270_put_view(&tp->view);
805                 tty_kref_put(tty);
806         }
807 }
808
809 /*
810  * Free tty3270 data structure
811  */
812 static void
813 tty3270_free(struct raw3270_view *view)
814 {
815         struct tty3270 *tp = container_of(view, struct tty3270, view);
816         tty3270_free_screen(tp);
817         tty3270_free_view(tp);
818 }
819
820 /*
821  * Delayed freeing of tty3270 views.
822  */
823 static void
824 tty3270_del_views(void)
825 {
826         int i;
827
828         for (i = 0; i < tty3270_max_index; i++) {
829                 struct raw3270_view *view =
830                         raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
831                 if (!IS_ERR(view))
832                         raw3270_del_view(view);
833         }
834 }
835
836 static struct raw3270_fn tty3270_fn = {
837         .activate = tty3270_activate,
838         .deactivate = tty3270_deactivate,
839         .intv = (void *) tty3270_irq,
840         .release = tty3270_release,
841         .free = tty3270_free
842 };
843
844 /*
845  * This routine is called whenever a 3270 tty is opened first time.
846  */
847 static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
848 {
849         struct raw3270_view *view;
850         struct tty3270 *tp;
851         int i, rc;
852
853         /* Check if the tty3270 is already there. */
854         view = raw3270_find_view(&tty3270_fn,
855                                   tty->index + RAW3270_FIRSTMINOR);
856         if (!IS_ERR(view)) {
857                 tp = container_of(view, struct tty3270, view);
858                 tty->driver_data = tp;
859                 tty->winsize.ws_row = tp->view.rows - 2;
860                 tty->winsize.ws_col = tp->view.cols;
861                 tty->low_latency = 0;
862                 /* why to reassign? */
863                 tty_port_tty_set(&tp->port, tty);
864                 tp->inattr = TF_INPUT;
865                 return tty_port_install(&tp->port, driver, tty);
866         }
867         if (tty3270_max_index < tty->index + 1)
868                 tty3270_max_index = tty->index + 1;
869
870         /* Quick exit if there is no device for tty->index. */
871         if (PTR_ERR(view) == -ENODEV)
872                 return -ENODEV;
873
874         /* Allocate tty3270 structure on first open. */
875         tp = tty3270_alloc_view();
876         if (IS_ERR(tp))
877                 return PTR_ERR(tp);
878
879         rc = raw3270_add_view(&tp->view, &tty3270_fn,
880                               tty->index + RAW3270_FIRSTMINOR);
881         if (rc) {
882                 tty3270_free_view(tp);
883                 return rc;
884         }
885
886         rc = tty3270_alloc_screen(tp);
887         if (rc) {
888                 raw3270_put_view(&tp->view);
889                 raw3270_del_view(&tp->view);
890                 return rc;
891         }
892
893         tty_port_tty_set(&tp->port, tty);
894         tty->low_latency = 0;
895         tty->winsize.ws_row = tp->view.rows - 2;
896         tty->winsize.ws_col = tp->view.cols;
897
898         tty3270_create_prompt(tp);
899         tty3270_create_status(tp);
900         tty3270_update_status(tp);
901
902         /* Create blank line for every line in the tty output area. */
903         for (i = 0; i < tp->view.rows - 2; i++)
904                 tty3270_blank_line(tp);
905
906         tp->kbd->port = &tp->port;
907         tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
908         tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
909         tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
910         tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
911         kbd_ascebc(tp->kbd, tp->view.ascebc);
912
913         raw3270_activate_view(&tp->view);
914
915         rc = tty_port_install(&tp->port, driver, tty);
916         if (rc) {
917                 raw3270_put_view(&tp->view);
918                 return rc;
919         }
920
921         tty->driver_data = tp;
922
923         return 0;
924 }
925
926 /*
927  * This routine is called when the 3270 tty is closed. We wait
928  * for the remaining request to be completed. Then we clean up.
929  */
930 static void
931 tty3270_close(struct tty_struct *tty, struct file * filp)
932 {
933         struct tty3270 *tp = tty->driver_data;
934
935         if (tty->count > 1)
936                 return;
937         if (tp) {
938                 tty->driver_data = NULL;
939                 tty_port_tty_set(&tp->port, NULL);
940         }
941 }
942
943 static void tty3270_cleanup(struct tty_struct *tty)
944 {
945         struct tty3270 *tp = tty->driver_data;
946
947         if (tp)
948                 raw3270_put_view(&tp->view);
949 }
950
951 /*
952  * We always have room.
953  */
954 static int
955 tty3270_write_room(struct tty_struct *tty)
956 {
957         return INT_MAX;
958 }
959
960 /*
961  * Insert character into the screen at the current position with the
962  * current color and highlight. This function does NOT do cursor movement.
963  */
964 static void tty3270_put_character(struct tty3270 *tp, char ch)
965 {
966         struct tty3270_line *line;
967         struct tty3270_cell *cell;
968
969         line = tp->screen + tp->cy;
970         if (line->len <= tp->cx) {
971                 while (line->len < tp->cx) {
972                         cell = line->cells + line->len;
973                         cell->character = tp->view.ascebc[' '];
974                         cell->highlight = tp->highlight;
975                         cell->f_color = tp->f_color;
976                         line->len++;
977                 }
978                 line->len++;
979         }
980         cell = line->cells + tp->cx;
981         cell->character = tp->view.ascebc[(unsigned int) ch];
982         cell->highlight = tp->highlight;
983         cell->f_color = tp->f_color;
984 }
985
986 /*
987  * Convert a tty3270_line to a 3270 data fragment usable for output.
988  */
989 static void
990 tty3270_convert_line(struct tty3270 *tp, int line_nr)
991 {
992         struct tty3270_line *line;
993         struct tty3270_cell *cell;
994         struct string *s, *n;
995         unsigned char highlight;
996         unsigned char f_color;
997         char *cp;
998         int flen, i;
999
1000         /* Determine how long the fragment will be. */
1001         flen = 3;               /* Prefix (TO_SBA). */
1002         line = tp->screen + line_nr;
1003         flen += line->len;
1004         highlight = TAX_RESET;
1005         f_color = TAC_RESET;
1006         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1007                 if (cell->highlight != highlight) {
1008                         flen += 3;      /* TO_SA to switch highlight. */
1009                         highlight = cell->highlight;
1010                 }
1011                 if (cell->f_color != f_color) {
1012                         flen += 3;      /* TO_SA to switch color. */
1013                         f_color = cell->f_color;
1014                 }
1015         }
1016         if (highlight != TAX_RESET)
1017                 flen += 3;      /* TO_SA to reset hightlight. */
1018         if (f_color != TAC_RESET)
1019                 flen += 3;      /* TO_SA to reset color. */
1020         if (line->len < tp->view.cols)
1021                 flen += 4;      /* Postfix (TO_RA). */
1022
1023         /* Find the line in the list. */
1024         i = tp->view.rows - 2 - line_nr;
1025         list_for_each_entry_reverse(s, &tp->lines, list)
1026                 if (--i <= 0)
1027                         break;
1028         /*
1029          * Check if the line needs to get reallocated.
1030          */
1031         if (s->len != flen) {
1032                 /* Reallocate string. */
1033                 n = tty3270_alloc_string(tp, flen);
1034                 list_add(&n->list, &s->list);
1035                 list_del_init(&s->list);
1036                 if (!list_empty(&s->update))
1037                         list_del_init(&s->update);
1038                 free_string(&tp->freemem, s);
1039                 s = n;
1040         }
1041
1042         /* Write 3270 data fragment. */
1043         cp = s->string;
1044         *cp++ = TO_SBA;
1045         *cp++ = 0;
1046         *cp++ = 0;
1047
1048         highlight = TAX_RESET;
1049         f_color = TAC_RESET;
1050         for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1051                 if (cell->highlight != highlight) {
1052                         *cp++ = TO_SA;
1053                         *cp++ = TAT_EXTHI;
1054                         *cp++ = cell->highlight;
1055                         highlight = cell->highlight;
1056                 }
1057                 if (cell->f_color != f_color) {
1058                         *cp++ = TO_SA;
1059                         *cp++ = TAT_COLOR;
1060                         *cp++ = cell->f_color;
1061                         f_color = cell->f_color;
1062                 }
1063                 *cp++ = cell->character;
1064         }
1065         if (highlight != TAX_RESET) {
1066                 *cp++ = TO_SA;
1067                 *cp++ = TAT_EXTHI;
1068                 *cp++ = TAX_RESET;
1069         }
1070         if (f_color != TAC_RESET) {
1071                 *cp++ = TO_SA;
1072                 *cp++ = TAT_COLOR;
1073                 *cp++ = TAC_RESET;
1074         }
1075         if (line->len < tp->view.cols) {
1076                 *cp++ = TO_RA;
1077                 *cp++ = 0;
1078                 *cp++ = 0;
1079                 *cp++ = 0;
1080         }
1081
1082         if (tp->nr_up + line_nr < tp->view.rows - 2) {
1083                 /* Line is currently visible on screen. */
1084                 tty3270_update_string(tp, s, line_nr);
1085                 /* Add line to update list. */
1086                 if (list_empty(&s->update)) {
1087                         list_add_tail(&s->update, &tp->update);
1088                         tp->update_flags |= TTY_UPDATE_LIST;
1089                 }
1090         }
1091 }
1092
1093 /*
1094  * Do carriage return.
1095  */
1096 static void
1097 tty3270_cr(struct tty3270 *tp)
1098 {
1099         tp->cx = 0;
1100 }
1101
1102 /*
1103  * Do line feed.
1104  */
1105 static void
1106 tty3270_lf(struct tty3270 *tp)
1107 {
1108         struct tty3270_line temp;
1109         int i;
1110
1111         tty3270_convert_line(tp, tp->cy);
1112         if (tp->cy < tp->view.rows - 3) {
1113                 tp->cy++;
1114                 return;
1115         }
1116         /* Last line just filled up. Add new, blank line. */
1117         tty3270_blank_line(tp);
1118         temp = tp->screen[0];
1119         temp.len = 0;
1120         for (i = 0; i < tp->view.rows - 3; i++)
1121                 tp->screen[i] = tp->screen[i+1];
1122         tp->screen[tp->view.rows - 3] = temp;
1123         tty3270_rebuild_update(tp);
1124 }
1125
1126 static void
1127 tty3270_ri(struct tty3270 *tp)
1128 {
1129         if (tp->cy > 0) {
1130             tty3270_convert_line(tp, tp->cy);
1131             tp->cy--;
1132         }
1133 }
1134
1135 /*
1136  * Insert characters at current position.
1137  */
1138 static void
1139 tty3270_insert_characters(struct tty3270 *tp, int n)
1140 {
1141         struct tty3270_line *line;
1142         int k;
1143
1144         line = tp->screen + tp->cy;
1145         while (line->len < tp->cx) {
1146                 line->cells[line->len].character = tp->view.ascebc[' '];
1147                 line->cells[line->len].highlight = TAX_RESET;
1148                 line->cells[line->len].f_color = TAC_RESET;
1149                 line->len++;
1150         }
1151         if (n > tp->view.cols - tp->cx)
1152                 n = tp->view.cols - tp->cx;
1153         k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1154         while (k--)
1155                 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1156         line->len += n;
1157         if (line->len > tp->view.cols)
1158                 line->len = tp->view.cols;
1159         while (n-- > 0) {
1160                 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1161                 line->cells[tp->cx + n].highlight = tp->highlight;
1162                 line->cells[tp->cx + n].f_color = tp->f_color;
1163         }
1164 }
1165
1166 /*
1167  * Delete characters at current position.
1168  */
1169 static void
1170 tty3270_delete_characters(struct tty3270 *tp, int n)
1171 {
1172         struct tty3270_line *line;
1173         int i;
1174
1175         line = tp->screen + tp->cy;
1176         if (line->len <= tp->cx)
1177                 return;
1178         if (line->len - tp->cx <= n) {
1179                 line->len = tp->cx;
1180                 return;
1181         }
1182         for (i = tp->cx; i + n < line->len; i++)
1183                 line->cells[i] = line->cells[i + n];
1184         line->len -= n;
1185 }
1186
1187 /*
1188  * Erase characters at current position.
1189  */
1190 static void
1191 tty3270_erase_characters(struct tty3270 *tp, int n)
1192 {
1193         struct tty3270_line *line;
1194         struct tty3270_cell *cell;
1195
1196         line = tp->screen + tp->cy;
1197         while (line->len > tp->cx && n-- > 0) {
1198                 cell = line->cells + tp->cx++;
1199                 cell->character = ' ';
1200                 cell->highlight = TAX_RESET;
1201                 cell->f_color = TAC_RESET;
1202         }
1203         tp->cx += n;
1204         tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1205 }
1206
1207 /*
1208  * Erase line, 3 different cases:
1209  *  Esc [ 0 K   Erase from current position to end of line inclusive
1210  *  Esc [ 1 K   Erase from beginning of line to current position inclusive
1211  *  Esc [ 2 K   Erase entire line (without moving cursor)
1212  */
1213 static void
1214 tty3270_erase_line(struct tty3270 *tp, int mode)
1215 {
1216         struct tty3270_line *line;
1217         struct tty3270_cell *cell;
1218         int i;
1219
1220         line = tp->screen + tp->cy;
1221         if (mode == 0)
1222                 line->len = tp->cx;
1223         else if (mode == 1) {
1224                 for (i = 0; i < tp->cx; i++) {
1225                         cell = line->cells + i;
1226                         cell->character = ' ';
1227                         cell->highlight = TAX_RESET;
1228                         cell->f_color = TAC_RESET;
1229                 }
1230                 if (line->len <= tp->cx)
1231                         line->len = tp->cx + 1;
1232         } else if (mode == 2)
1233                 line->len = 0;
1234         tty3270_convert_line(tp, tp->cy);
1235 }
1236
1237 /*
1238  * Erase display, 3 different cases:
1239  *  Esc [ 0 J   Erase from current position to bottom of screen inclusive
1240  *  Esc [ 1 J   Erase from top of screen to current position inclusive
1241  *  Esc [ 2 J   Erase entire screen (without moving the cursor)
1242  */
1243 static void
1244 tty3270_erase_display(struct tty3270 *tp, int mode)
1245 {
1246         int i;
1247
1248         if (mode == 0) {
1249                 tty3270_erase_line(tp, 0);
1250                 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1251                         tp->screen[i].len = 0;
1252                         tty3270_convert_line(tp, i);
1253                 }
1254         } else if (mode == 1) {
1255                 for (i = 0; i < tp->cy; i++) {
1256                         tp->screen[i].len = 0;
1257                         tty3270_convert_line(tp, i);
1258                 }
1259                 tty3270_erase_line(tp, 1);
1260         } else if (mode == 2) {
1261                 for (i = 0; i < tp->view.rows - 2; i++) {
1262                         tp->screen[i].len = 0;
1263                         tty3270_convert_line(tp, i);
1264                 }
1265         }
1266         tty3270_rebuild_update(tp);
1267 }
1268
1269 /*
1270  * Set attributes found in an escape sequence.
1271  *  Esc [ <attr> ; <attr> ; ... m
1272  */
1273 static void
1274 tty3270_set_attributes(struct tty3270 *tp)
1275 {
1276         static unsigned char f_colors[] = {
1277                 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1278                 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1279         };
1280         int i, attr;
1281
1282         for (i = 0; i <= tp->esc_npar; i++) {
1283                 attr = tp->esc_par[i];
1284                 switch (attr) {
1285                 case 0:         /* Reset */
1286                         tp->highlight = TAX_RESET;
1287                         tp->f_color = TAC_RESET;
1288                         break;
1289                 /* Highlight. */
1290                 case 4:         /* Start underlining. */
1291                         tp->highlight = TAX_UNDER;
1292                         break;
1293                 case 5:         /* Start blink. */
1294                         tp->highlight = TAX_BLINK;
1295                         break;
1296                 case 7:         /* Start reverse. */
1297                         tp->highlight = TAX_REVER;
1298                         break;
1299                 case 24:        /* End underlining */
1300                         if (tp->highlight == TAX_UNDER)
1301                                 tp->highlight = TAX_RESET;
1302                         break;
1303                 case 25:        /* End blink. */
1304                         if (tp->highlight == TAX_BLINK)
1305                                 tp->highlight = TAX_RESET;
1306                         break;
1307                 case 27:        /* End reverse. */
1308                         if (tp->highlight == TAX_REVER)
1309                                 tp->highlight = TAX_RESET;
1310                         break;
1311                 /* Foreground color. */
1312                 case 30:        /* Black */
1313                 case 31:        /* Red */
1314                 case 32:        /* Green */
1315                 case 33:        /* Yellow */
1316                 case 34:        /* Blue */
1317                 case 35:        /* Magenta */
1318                 case 36:        /* Cyan */
1319                 case 37:        /* White */
1320                 case 39:        /* Black */
1321                         tp->f_color = f_colors[attr - 30];
1322                         break;
1323                 }
1324         }
1325 }
1326
1327 static inline int
1328 tty3270_getpar(struct tty3270 *tp, int ix)
1329 {
1330         return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1331 }
1332
1333 static void
1334 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1335 {
1336         int max_cx = max(0, cx);
1337         int max_cy = max(0, cy);
1338
1339         tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1340         cy = min_t(int, tp->view.rows - 3, max_cy);
1341         if (cy != tp->cy) {
1342                 tty3270_convert_line(tp, tp->cy);
1343                 tp->cy = cy;
1344         }
1345 }
1346
1347 /*
1348  * Process escape sequences. Known sequences:
1349  *  Esc 7                       Save Cursor Position
1350  *  Esc 8                       Restore Cursor Position
1351  *  Esc [ Pn ; Pn ; .. m        Set attributes
1352  *  Esc [ Pn ; Pn H             Cursor Position
1353  *  Esc [ Pn ; Pn f             Cursor Position
1354  *  Esc [ Pn A                  Cursor Up
1355  *  Esc [ Pn B                  Cursor Down
1356  *  Esc [ Pn C                  Cursor Forward
1357  *  Esc [ Pn D                  Cursor Backward
1358  *  Esc [ Pn G                  Cursor Horizontal Absolute
1359  *  Esc [ Pn X                  Erase Characters
1360  *  Esc [ Ps J                  Erase in Display
1361  *  Esc [ Ps K                  Erase in Line
1362  * // FIXME: add all the new ones.
1363  *
1364  *  Pn is a numeric parameter, a string of zero or more decimal digits.
1365  *  Ps is a selective parameter.
1366  */
1367 static void
1368 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1369 {
1370         enum { ESnormal, ESesc, ESsquare, ESgetpars };
1371
1372         if (tp->esc_state == ESnormal) {
1373                 if (ch == 0x1b)
1374                         /* Starting new escape sequence. */
1375                         tp->esc_state = ESesc;
1376                 return;
1377         }
1378         if (tp->esc_state == ESesc) {
1379                 tp->esc_state = ESnormal;
1380                 switch (ch) {
1381                 case '[':
1382                         tp->esc_state = ESsquare;
1383                         break;
1384                 case 'E':
1385                         tty3270_cr(tp);
1386                         tty3270_lf(tp);
1387                         break;
1388                 case 'M':
1389                         tty3270_ri(tp);
1390                         break;
1391                 case 'D':
1392                         tty3270_lf(tp);
1393                         break;
1394                 case 'Z':               /* Respond ID. */
1395                         kbd_puts_queue(&tp->port, "\033[?6c");
1396                         break;
1397                 case '7':               /* Save cursor position. */
1398                         tp->saved_cx = tp->cx;
1399                         tp->saved_cy = tp->cy;
1400                         tp->saved_highlight = tp->highlight;
1401                         tp->saved_f_color = tp->f_color;
1402                         break;
1403                 case '8':               /* Restore cursor position. */
1404                         tty3270_convert_line(tp, tp->cy);
1405                         tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1406                         tp->highlight = tp->saved_highlight;
1407                         tp->f_color = tp->saved_f_color;
1408                         break;
1409                 case 'c':               /* Reset terminal. */
1410                         tp->cx = tp->saved_cx = 0;
1411                         tp->cy = tp->saved_cy = 0;
1412                         tp->highlight = tp->saved_highlight = TAX_RESET;
1413                         tp->f_color = tp->saved_f_color = TAC_RESET;
1414                         tty3270_erase_display(tp, 2);
1415                         break;
1416                 }
1417                 return;
1418         }
1419         if (tp->esc_state == ESsquare) {
1420                 tp->esc_state = ESgetpars;
1421                 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1422                 tp->esc_npar = 0;
1423                 tp->esc_ques = (ch == '?');
1424                 if (tp->esc_ques)
1425                         return;
1426         }
1427         if (tp->esc_state == ESgetpars) {
1428                 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1429                         tp->esc_npar++;
1430                         return;
1431                 }
1432                 if (ch >= '0' && ch <= '9') {
1433                         tp->esc_par[tp->esc_npar] *= 10;
1434                         tp->esc_par[tp->esc_npar] += ch - '0';
1435                         return;
1436                 }
1437         }
1438         tp->esc_state = ESnormal;
1439         if (ch == 'n' && !tp->esc_ques) {
1440                 if (tp->esc_par[0] == 5)                /* Status report. */
1441                         kbd_puts_queue(&tp->port, "\033[0n");
1442                 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1443                         char buf[40];
1444                         sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1445                         kbd_puts_queue(&tp->port, buf);
1446                 }
1447                 return;
1448         }
1449         if (tp->esc_ques)
1450                 return;
1451         switch (ch) {
1452         case 'm':
1453                 tty3270_set_attributes(tp);
1454                 break;
1455         case 'H':       /* Set cursor position. */
1456         case 'f':
1457                 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1458                                 tty3270_getpar(tp, 0) - 1);
1459                 break;
1460         case 'd':       /* Set y position. */
1461                 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1462                 break;
1463         case 'A':       /* Cursor up. */
1464         case 'F':
1465                 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1466                 break;
1467         case 'B':       /* Cursor down. */
1468         case 'e':
1469         case 'E':
1470                 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1471                 break;
1472         case 'C':       /* Cursor forward. */
1473         case 'a':
1474                 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1475                 break;
1476         case 'D':       /* Cursor backward. */
1477                 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1478                 break;
1479         case 'G':       /* Set x position. */
1480         case '`':
1481                 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1482                 break;
1483         case 'X':       /* Erase Characters. */
1484                 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1485                 break;
1486         case 'J':       /* Erase display. */
1487                 tty3270_erase_display(tp, tp->esc_par[0]);
1488                 break;
1489         case 'K':       /* Erase line. */
1490                 tty3270_erase_line(tp, tp->esc_par[0]);
1491                 break;
1492         case 'P':       /* Delete characters. */
1493                 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1494                 break;
1495         case '@':       /* Insert characters. */
1496                 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1497                 break;
1498         case 's':       /* Save cursor position. */
1499                 tp->saved_cx = tp->cx;
1500                 tp->saved_cy = tp->cy;
1501                 tp->saved_highlight = tp->highlight;
1502                 tp->saved_f_color = tp->f_color;
1503                 break;
1504         case 'u':       /* Restore cursor position. */
1505                 tty3270_convert_line(tp, tp->cy);
1506                 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1507                 tp->highlight = tp->saved_highlight;
1508                 tp->f_color = tp->saved_f_color;
1509                 break;
1510         }
1511 }
1512
1513 /*
1514  * String write routine for 3270 ttys
1515  */
1516 static void
1517 tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
1518                 const unsigned char *buf, int count)
1519 {
1520         int i_msg, i;
1521
1522         spin_lock_bh(&tp->view.lock);
1523         for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) {
1524                 if (tp->esc_state != 0) {
1525                         /* Continue escape sequence. */
1526                         tty3270_escape_sequence(tp, buf[i_msg]);
1527                         continue;
1528                 }
1529
1530                 switch (buf[i_msg]) {
1531                 case 0x07:              /* '\a' -- Alarm */
1532                         tp->wcc |= TW_PLUSALARM;
1533                         break;
1534                 case 0x08:              /* Backspace. */
1535                         if (tp->cx > 0) {
1536                                 tp->cx--;
1537                                 tty3270_put_character(tp, ' ');
1538                         }
1539                         break;
1540                 case 0x09:              /* '\t' -- Tabulate */
1541                         for (i = tp->cx % 8; i < 8; i++) {
1542                                 if (tp->cx >= tp->view.cols) {
1543                                         tty3270_cr(tp);
1544                                         tty3270_lf(tp);
1545                                         break;
1546                                 }
1547                                 tty3270_put_character(tp, ' ');
1548                                 tp->cx++;
1549                         }
1550                         break;
1551                 case 0x0a:              /* '\n' -- New Line */
1552                         tty3270_cr(tp);
1553                         tty3270_lf(tp);
1554                         break;
1555                 case 0x0c:              /* '\f' -- Form Feed */
1556                         tty3270_erase_display(tp, 2);
1557                         tp->cx = tp->cy = 0;
1558                         break;
1559                 case 0x0d:              /* '\r' -- Carriage Return */
1560                         tp->cx = 0;
1561                         break;
1562                 case 0x0f:              /* SuSE "exit alternate mode" */
1563                         break;
1564                 case 0x1b:              /* Start escape sequence. */
1565                         tty3270_escape_sequence(tp, buf[i_msg]);
1566                         break;
1567                 default:                /* Insert normal character. */
1568                         if (tp->cx >= tp->view.cols) {
1569                                 tty3270_cr(tp);
1570                                 tty3270_lf(tp);
1571                         }
1572                         tty3270_put_character(tp, buf[i_msg]);
1573                         tp->cx++;
1574                         break;
1575                 }
1576         }
1577         /* Convert current line to 3270 data fragment. */
1578         tty3270_convert_line(tp, tp->cy);
1579
1580         /* Setup timer to update display after 1/10 second */
1581         if (!timer_pending(&tp->timer))
1582                 tty3270_set_timer(tp, HZ/10);
1583
1584         spin_unlock_bh(&tp->view.lock);
1585 }
1586
1587 /*
1588  * String write routine for 3270 ttys
1589  */
1590 static int
1591 tty3270_write(struct tty_struct * tty,
1592               const unsigned char *buf, int count)
1593 {
1594         struct tty3270 *tp;
1595
1596         tp = tty->driver_data;
1597         if (!tp)
1598                 return 0;
1599         if (tp->char_count > 0) {
1600                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1601                 tp->char_count = 0;
1602         }
1603         tty3270_do_write(tp, tty, buf, count);
1604         return count;
1605 }
1606
1607 /*
1608  * Put single characters to the ttys character buffer
1609  */
1610 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1611 {
1612         struct tty3270 *tp;
1613
1614         tp = tty->driver_data;
1615         if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1616                 return 0;
1617         tp->char_buf[tp->char_count++] = ch;
1618         return 1;
1619 }
1620
1621 /*
1622  * Flush all characters from the ttys characeter buffer put there
1623  * by tty3270_put_char.
1624  */
1625 static void
1626 tty3270_flush_chars(struct tty_struct *tty)
1627 {
1628         struct tty3270 *tp;
1629
1630         tp = tty->driver_data;
1631         if (!tp)
1632                 return;
1633         if (tp->char_count > 0) {
1634                 tty3270_do_write(tp, tty, tp->char_buf, tp->char_count);
1635                 tp->char_count = 0;
1636         }
1637 }
1638
1639 /*
1640  * Returns the number of characters in the output buffer. This is
1641  * used in tty_wait_until_sent to wait until all characters have
1642  * appeared on the screen.
1643  */
1644 static int
1645 tty3270_chars_in_buffer(struct tty_struct *tty)
1646 {
1647         return 0;
1648 }
1649
1650 static void
1651 tty3270_flush_buffer(struct tty_struct *tty)
1652 {
1653 }
1654
1655 /*
1656  * Check for visible/invisible input switches
1657  */
1658 static void
1659 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1660 {
1661         struct tty3270 *tp;
1662         int new;
1663
1664         tp = tty->driver_data;
1665         if (!tp)
1666                 return;
1667         spin_lock_bh(&tp->view.lock);
1668         if (L_ICANON(tty)) {
1669                 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1670                 if (new != tp->inattr) {
1671                         tp->inattr = new;
1672                         tty3270_update_prompt(tp, NULL, 0);
1673                         tty3270_set_timer(tp, 1);
1674                 }
1675         }
1676         spin_unlock_bh(&tp->view.lock);
1677 }
1678
1679 /*
1680  * Disable reading from a 3270 tty
1681  */
1682 static void
1683 tty3270_throttle(struct tty_struct * tty)
1684 {
1685         struct tty3270 *tp;
1686
1687         tp = tty->driver_data;
1688         if (!tp)
1689                 return;
1690         tp->throttle = 1;
1691 }
1692
1693 /*
1694  * Enable reading from a 3270 tty
1695  */
1696 static void
1697 tty3270_unthrottle(struct tty_struct * tty)
1698 {
1699         struct tty3270 *tp;
1700
1701         tp = tty->driver_data;
1702         if (!tp)
1703                 return;
1704         tp->throttle = 0;
1705         if (tp->attn)
1706                 tty3270_issue_read(tp, 1);
1707 }
1708
1709 /*
1710  * Hang up the tty device.
1711  */
1712 static void
1713 tty3270_hangup(struct tty_struct *tty)
1714 {
1715         // FIXME: implement
1716 }
1717
1718 static void
1719 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1720 {
1721 }
1722
1723 static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd,
1724                          unsigned long arg)
1725 {
1726         struct tty3270 *tp;
1727
1728         tp = tty->driver_data;
1729         if (!tp)
1730                 return -ENODEV;
1731         if (tty->flags & (1 << TTY_IO_ERROR))
1732                 return -EIO;
1733         return kbd_ioctl(tp->kbd, cmd, arg);
1734 }
1735
1736 #ifdef CONFIG_COMPAT
1737 static long tty3270_compat_ioctl(struct tty_struct *tty,
1738                                  unsigned int cmd, unsigned long arg)
1739 {
1740         struct tty3270 *tp;
1741
1742         tp = tty->driver_data;
1743         if (!tp)
1744                 return -ENODEV;
1745         if (tty->flags & (1 << TTY_IO_ERROR))
1746                 return -EIO;
1747         return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg));
1748 }
1749 #endif
1750
1751 static const struct tty_operations tty3270_ops = {
1752         .install = tty3270_install,
1753         .cleanup = tty3270_cleanup,
1754         .close = tty3270_close,
1755         .write = tty3270_write,
1756         .put_char = tty3270_put_char,
1757         .flush_chars = tty3270_flush_chars,
1758         .write_room = tty3270_write_room,
1759         .chars_in_buffer = tty3270_chars_in_buffer,
1760         .flush_buffer = tty3270_flush_buffer,
1761         .throttle = tty3270_throttle,
1762         .unthrottle = tty3270_unthrottle,
1763         .hangup = tty3270_hangup,
1764         .wait_until_sent = tty3270_wait_until_sent,
1765         .ioctl = tty3270_ioctl,
1766 #ifdef CONFIG_COMPAT
1767         .compat_ioctl = tty3270_compat_ioctl,
1768 #endif
1769         .set_termios = tty3270_set_termios
1770 };
1771
1772 /*
1773  * 3270 tty registration code called from tty_init().
1774  * Most kernel services (incl. kmalloc) are available at this poimt.
1775  */
1776 static int __init tty3270_init(void)
1777 {
1778         struct tty_driver *driver;
1779         int ret;
1780
1781         driver = alloc_tty_driver(RAW3270_MAXDEVS);
1782         if (!driver)
1783                 return -ENOMEM;
1784
1785         /*
1786          * Initialize the tty_driver structure
1787          * Entries in tty3270_driver that are NOT initialized:
1788          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1789          */
1790         driver->driver_name = "ttyTUB";
1791         driver->name = "ttyTUB";
1792         driver->major = IBM_TTY3270_MAJOR;
1793         driver->minor_start = RAW3270_FIRSTMINOR;
1794         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1795         driver->subtype = SYSTEM_TYPE_TTY;
1796         driver->init_termios = tty_std_termios;
1797         driver->flags = TTY_DRIVER_RESET_TERMIOS;
1798         tty_set_operations(driver, &tty3270_ops);
1799         ret = tty_register_driver(driver);
1800         if (ret) {
1801                 put_tty_driver(driver);
1802                 return ret;
1803         }
1804         tty3270_driver = driver;
1805         return 0;
1806 }
1807
1808 static void __exit
1809 tty3270_exit(void)
1810 {
1811         struct tty_driver *driver;
1812
1813         driver = tty3270_driver;
1814         tty3270_driver = NULL;
1815         tty_unregister_driver(driver);
1816         put_tty_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);