Linux 2.6.34-rc3
[pohmelfs.git] / drivers / s390 / char / tty3270.c
blob911822db614d25f88273ce2dbdadab5042b7e743
1 /*
2 * drivers/s390/char/tty3270.c
3 * IBM/3270 Driver - tty functions.
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 */
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>
20 #include <linux/slab.h>
21 #include <linux/bootmem.h>
22 #include <linux/compat.h>
24 #include <asm/ccwdev.h>
25 #include <asm/cio.h>
26 #include <asm/ebcdic.h>
27 #include <asm/uaccess.h>
29 #include "raw3270.h"
30 #include "tty3270.h"
31 #include "keyboard.h"
33 #define TTY3270_CHAR_BUF_SIZE 256
34 #define TTY3270_OUTPUT_BUFFER_SIZE 1024
35 #define TTY3270_STRING_PAGES 5
37 struct tty_driver *tty3270_driver;
38 static int tty3270_max_index;
40 static struct raw3270_fn tty3270_fn;
42 struct tty3270_cell {
43 unsigned char character;
44 unsigned char highlight;
45 unsigned char f_color;
48 struct tty3270_line {
49 struct tty3270_cell *cells;
50 int len;
53 #define ESCAPE_NPAR 8
56 * The main tty view data structure.
57 * FIXME:
58 * 1) describe line orientation & lines list concept against screen
59 * 2) describe conversion of screen to lines
60 * 3) describe line format.
62 struct tty3270 {
63 struct raw3270_view view;
64 struct tty_struct *tty; /* Pointer to tty structure */
65 void **freemem_pages; /* Array of pages used for freemem. */
66 struct list_head freemem; /* List of free memory for strings. */
68 /* Output stuff. */
69 struct list_head lines; /* List of lines. */
70 struct list_head update; /* List of lines to update. */
71 unsigned char wcc; /* Write control character. */
72 int nr_lines; /* # lines in list. */
73 int nr_up; /* # lines up in history. */
74 unsigned long update_flags; /* Update indication bits. */
75 struct string *status; /* Lower right of display. */
76 struct raw3270_request *write; /* Single write request. */
77 struct timer_list timer; /* Output delay timer. */
79 /* Current tty screen. */
80 unsigned int cx, cy; /* Current output position. */
81 unsigned int highlight; /* Blink/reverse/underscore */
82 unsigned int f_color; /* Foreground color */
83 struct tty3270_line *screen;
85 /* Input stuff. */
86 struct string *prompt; /* Output string for input area. */
87 struct string *input; /* Input string for read request. */
88 struct raw3270_request *read; /* Single read request. */
89 struct raw3270_request *kreset; /* Single keyboard reset request. */
90 unsigned char inattr; /* Visible/invisible input. */
91 int throttle, attn; /* tty throttle/unthrottle. */
92 struct tasklet_struct readlet; /* Tasklet to issue read request. */
93 struct kbd_data *kbd; /* key_maps stuff. */
95 /* Escape sequence parsing. */
96 int esc_state, esc_ques, esc_npar;
97 int esc_par[ESCAPE_NPAR];
98 unsigned int saved_cx, saved_cy;
99 unsigned int saved_highlight, saved_f_color;
101 /* Command recalling. */
102 struct list_head rcl_lines; /* List of recallable lines. */
103 struct list_head *rcl_walk; /* Point in rcl_lines list. */
104 int rcl_nr, rcl_max; /* Number/max number of rcl_lines. */
106 /* Character array for put_char/flush_chars. */
107 unsigned int char_count;
108 char char_buf[TTY3270_CHAR_BUF_SIZE];
111 /* tty3270->update_flags. See tty3270_update for details. */
112 #define TTY_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */
113 #define TTY_UPDATE_LIST 2 /* Update lines in tty3270->update. */
114 #define TTY_UPDATE_INPUT 4 /* Update input line. */
115 #define TTY_UPDATE_STATUS 8 /* Update status line. */
116 #define TTY_UPDATE_ALL 16 /* Recreate screen. */
118 static void tty3270_update(struct tty3270 *);
121 * Setup timeout for a device. On timeout trigger an update.
123 static void tty3270_set_timer(struct tty3270 *tp, int expires)
125 if (expires == 0)
126 del_timer(&tp->timer);
127 else
128 mod_timer(&tp->timer, jiffies + expires);
132 * The input line are the two last lines of the screen.
134 static void
135 tty3270_update_prompt(struct tty3270 *tp, char *input, int count)
137 struct string *line;
138 unsigned int off;
140 line = tp->prompt;
141 if (count != 0)
142 line->string[5] = TF_INMDT;
143 else
144 line->string[5] = tp->inattr;
145 if (count > tp->view.cols * 2 - 11)
146 count = tp->view.cols * 2 - 11;
147 memcpy(line->string + 6, input, count);
148 line->string[6 + count] = TO_IC;
149 /* Clear to end of input line. */
150 if (count < tp->view.cols * 2 - 11) {
151 line->string[7 + count] = TO_RA;
152 line->string[10 + count] = 0;
153 off = tp->view.cols * tp->view.rows - 9;
154 raw3270_buffer_address(tp->view.dev, line->string+count+8, off);
155 line->len = 11 + count;
156 } else
157 line->len = 7 + count;
158 tp->update_flags |= TTY_UPDATE_INPUT;
161 static void
162 tty3270_create_prompt(struct tty3270 *tp)
164 static const unsigned char blueprint[] =
165 { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT,
166 /* empty input string */
167 TO_IC, TO_RA, 0, 0, 0 };
168 struct string *line;
169 unsigned int offset;
171 line = alloc_string(&tp->freemem,
172 sizeof(blueprint) + tp->view.cols * 2 - 9);
173 tp->prompt = line;
174 tp->inattr = TF_INPUT;
175 /* Copy blueprint to status line */
176 memcpy(line->string, blueprint, sizeof(blueprint));
177 line->len = sizeof(blueprint);
178 /* Set output offsets. */
179 offset = tp->view.cols * (tp->view.rows - 2);
180 raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
181 offset = tp->view.cols * tp->view.rows - 9;
182 raw3270_buffer_address(tp->view.dev, line->string + 8, offset);
184 /* Allocate input string for reading. */
185 tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6);
189 * The status line is the last line of the screen. It shows the string
190 * "Running"/"Holding" in the lower right corner of the screen.
192 static void
193 tty3270_update_status(struct tty3270 * tp)
195 char *str;
197 str = (tp->nr_up != 0) ? "History" : "Running";
198 memcpy(tp->status->string + 8, str, 7);
199 codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
200 tp->update_flags |= TTY_UPDATE_STATUS;
203 static void
204 tty3270_create_status(struct tty3270 * tp)
206 static const unsigned char blueprint[] =
207 { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN,
208 0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR,
209 TAC_RESET };
210 struct string *line;
211 unsigned int offset;
213 line = alloc_string(&tp->freemem,sizeof(blueprint));
214 tp->status = line;
215 /* Copy blueprint to status line */
216 memcpy(line->string, blueprint, sizeof(blueprint));
217 /* Set address to start of status string (= last 9 characters). */
218 offset = tp->view.cols * tp->view.rows - 9;
219 raw3270_buffer_address(tp->view.dev, line->string + 1, offset);
223 * Set output offsets to 3270 datastream fragment of a tty string.
224 * (TO_SBA offset at the start and TO_RA offset at the end of the string)
226 static void
227 tty3270_update_string(struct tty3270 *tp, struct string *line, int nr)
229 unsigned char *cp;
231 raw3270_buffer_address(tp->view.dev, line->string + 1,
232 tp->view.cols * nr);
233 cp = line->string + line->len - 4;
234 if (*cp == TO_RA)
235 raw3270_buffer_address(tp->view.dev, cp + 1,
236 tp->view.cols * (nr + 1));
240 * Rebuild update list to print all lines.
242 static void
243 tty3270_rebuild_update(struct tty3270 *tp)
245 struct string *s, *n;
246 int line, nr_up;
249 * Throw away update list and create a new one,
250 * containing all lines that will fit on the screen.
252 list_for_each_entry_safe(s, n, &tp->update, update)
253 list_del_init(&s->update);
254 line = tp->view.rows - 3;
255 nr_up = tp->nr_up;
256 list_for_each_entry_reverse(s, &tp->lines, list) {
257 if (nr_up > 0) {
258 nr_up--;
259 continue;
261 tty3270_update_string(tp, s, line);
262 list_add(&s->update, &tp->update);
263 if (--line < 0)
264 break;
266 tp->update_flags |= TTY_UPDATE_LIST;
270 * Alloc string for size bytes. If there is not enough room in
271 * freemem, free strings until there is room.
273 static struct string *
274 tty3270_alloc_string(struct tty3270 *tp, size_t size)
276 struct string *s, *n;
278 s = alloc_string(&tp->freemem, size);
279 if (s)
280 return s;
281 list_for_each_entry_safe(s, n, &tp->lines, list) {
282 BUG_ON(tp->nr_lines <= tp->view.rows - 2);
283 list_del(&s->list);
284 if (!list_empty(&s->update))
285 list_del(&s->update);
286 tp->nr_lines--;
287 if (free_string(&tp->freemem, s) >= size)
288 break;
290 s = alloc_string(&tp->freemem, size);
291 BUG_ON(!s);
292 if (tp->nr_up != 0 &&
293 tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) {
294 tp->nr_up = tp->nr_lines - tp->view.rows + 2;
295 tty3270_rebuild_update(tp);
296 tty3270_update_status(tp);
298 return s;
302 * Add an empty line to the list.
304 static void
305 tty3270_blank_line(struct tty3270 *tp)
307 static const unsigned char blueprint[] =
308 { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET,
309 TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 };
310 struct string *s;
312 s = tty3270_alloc_string(tp, sizeof(blueprint));
313 memcpy(s->string, blueprint, sizeof(blueprint));
314 s->len = sizeof(blueprint);
315 list_add_tail(&s->list, &tp->lines);
316 tp->nr_lines++;
317 if (tp->nr_up != 0)
318 tp->nr_up++;
322 * Write request completion callback.
324 static void
325 tty3270_write_callback(struct raw3270_request *rq, void *data)
327 struct tty3270 *tp;
329 tp = (struct tty3270 *) rq->view;
330 if (rq->rc != 0) {
331 /* Write wasn't successfull. Refresh all. */
332 tp->update_flags = TTY_UPDATE_ALL;
333 tty3270_set_timer(tp, 1);
335 raw3270_request_reset(rq);
336 xchg(&tp->write, rq);
340 * Update 3270 display.
342 static void
343 tty3270_update(struct tty3270 *tp)
345 static char invalid_sba[2] = { 0xff, 0xff };
346 struct raw3270_request *wrq;
347 unsigned long updated;
348 struct string *s, *n;
349 char *sba, *str;
350 int rc, len;
352 wrq = xchg(&tp->write, 0);
353 if (!wrq) {
354 tty3270_set_timer(tp, 1);
355 return;
358 spin_lock(&tp->view.lock);
359 updated = 0;
360 if (tp->update_flags & TTY_UPDATE_ALL) {
361 tty3270_rebuild_update(tp);
362 tty3270_update_status(tp);
363 tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
364 TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
366 if (tp->update_flags & TTY_UPDATE_ERASE) {
367 /* Use erase write alternate to erase display. */
368 raw3270_request_set_cmd(wrq, TC_EWRITEA);
369 updated |= TTY_UPDATE_ERASE;
370 } else
371 raw3270_request_set_cmd(wrq, TC_WRITE);
373 raw3270_request_add_data(wrq, &tp->wcc, 1);
374 tp->wcc = TW_NONE;
377 * Update status line.
379 if (tp->update_flags & TTY_UPDATE_STATUS)
380 if (raw3270_request_add_data(wrq, tp->status->string,
381 tp->status->len) == 0)
382 updated |= TTY_UPDATE_STATUS;
385 * Write input line.
387 if (tp->update_flags & TTY_UPDATE_INPUT)
388 if (raw3270_request_add_data(wrq, tp->prompt->string,
389 tp->prompt->len) == 0)
390 updated |= TTY_UPDATE_INPUT;
392 sba = invalid_sba;
394 if (tp->update_flags & TTY_UPDATE_LIST) {
395 /* Write strings in the update list to the screen. */
396 list_for_each_entry_safe(s, n, &tp->update, update) {
397 str = s->string;
398 len = s->len;
400 * Skip TO_SBA at the start of the string if the
401 * last output position matches the start address
402 * of this line.
404 if (s->string[1] == sba[0] && s->string[2] == sba[1])
405 str += 3, len -= 3;
406 if (raw3270_request_add_data(wrq, str, len) != 0)
407 break;
408 list_del_init(&s->update);
409 sba = s->string + s->len - 3;
411 if (list_empty(&tp->update))
412 updated |= TTY_UPDATE_LIST;
414 wrq->callback = tty3270_write_callback;
415 rc = raw3270_start(&tp->view, wrq);
416 if (rc == 0) {
417 tp->update_flags &= ~updated;
418 if (tp->update_flags)
419 tty3270_set_timer(tp, 1);
420 } else {
421 raw3270_request_reset(wrq);
422 xchg(&tp->write, wrq);
424 spin_unlock(&tp->view.lock);
428 * Command recalling.
430 static void
431 tty3270_rcl_add(struct tty3270 *tp, char *input, int len)
433 struct string *s;
435 tp->rcl_walk = NULL;
436 if (len <= 0)
437 return;
438 if (tp->rcl_nr >= tp->rcl_max) {
439 s = list_entry(tp->rcl_lines.next, struct string, list);
440 list_del(&s->list);
441 free_string(&tp->freemem, s);
442 tp->rcl_nr--;
444 s = tty3270_alloc_string(tp, len);
445 memcpy(s->string, input, len);
446 list_add_tail(&s->list, &tp->rcl_lines);
447 tp->rcl_nr++;
450 static void
451 tty3270_rcl_backward(struct kbd_data *kbd)
453 struct tty3270 *tp;
454 struct string *s;
456 tp = kbd->tty->driver_data;
457 spin_lock_bh(&tp->view.lock);
458 if (tp->inattr == TF_INPUT) {
459 if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines)
460 tp->rcl_walk = tp->rcl_walk->prev;
461 else if (!list_empty(&tp->rcl_lines))
462 tp->rcl_walk = tp->rcl_lines.prev;
463 s = tp->rcl_walk ?
464 list_entry(tp->rcl_walk, struct string, list) : NULL;
465 if (tp->rcl_walk) {
466 s = list_entry(tp->rcl_walk, struct string, list);
467 tty3270_update_prompt(tp, s->string, s->len);
468 } else
469 tty3270_update_prompt(tp, NULL, 0);
470 tty3270_set_timer(tp, 1);
472 spin_unlock_bh(&tp->view.lock);
476 * Deactivate tty view.
478 static void
479 tty3270_exit_tty(struct kbd_data *kbd)
481 struct tty3270 *tp;
483 tp = kbd->tty->driver_data;
484 raw3270_deactivate_view(&tp->view);
488 * Scroll forward in history.
490 static void
491 tty3270_scroll_forward(struct kbd_data *kbd)
493 struct tty3270 *tp;
494 int nr_up;
496 tp = kbd->tty->driver_data;
497 spin_lock_bh(&tp->view.lock);
498 nr_up = tp->nr_up - tp->view.rows + 2;
499 if (nr_up < 0)
500 nr_up = 0;
501 if (nr_up != tp->nr_up) {
502 tp->nr_up = nr_up;
503 tty3270_rebuild_update(tp);
504 tty3270_update_status(tp);
505 tty3270_set_timer(tp, 1);
507 spin_unlock_bh(&tp->view.lock);
511 * Scroll backward in history.
513 static void
514 tty3270_scroll_backward(struct kbd_data *kbd)
516 struct tty3270 *tp;
517 int nr_up;
519 tp = kbd->tty->driver_data;
520 spin_lock_bh(&tp->view.lock);
521 nr_up = tp->nr_up + tp->view.rows - 2;
522 if (nr_up + tp->view.rows - 2 > tp->nr_lines)
523 nr_up = tp->nr_lines - tp->view.rows + 2;
524 if (nr_up != tp->nr_up) {
525 tp->nr_up = nr_up;
526 tty3270_rebuild_update(tp);
527 tty3270_update_status(tp);
528 tty3270_set_timer(tp, 1);
530 spin_unlock_bh(&tp->view.lock);
534 * Pass input line to tty.
536 static void
537 tty3270_read_tasklet(struct raw3270_request *rrq)
539 static char kreset_data = TW_KR;
540 struct tty3270 *tp;
541 char *input;
542 int len;
544 tp = (struct tty3270 *) rrq->view;
545 spin_lock_bh(&tp->view.lock);
547 * Two AID keys are special: For 0x7d (enter) the input line
548 * has to be emitted to the tty and for 0x6d the screen
549 * needs to be redrawn.
551 input = NULL;
552 len = 0;
553 if (tp->input->string[0] == 0x7d) {
554 /* Enter: write input to tty. */
555 input = tp->input->string + 6;
556 len = tp->input->len - 6 - rrq->rescnt;
557 if (tp->inattr != TF_INPUTN)
558 tty3270_rcl_add(tp, input, len);
559 if (tp->nr_up > 0) {
560 tp->nr_up = 0;
561 tty3270_rebuild_update(tp);
562 tty3270_update_status(tp);
564 /* Clear input area. */
565 tty3270_update_prompt(tp, NULL, 0);
566 tty3270_set_timer(tp, 1);
567 } else if (tp->input->string[0] == 0x6d) {
568 /* Display has been cleared. Redraw. */
569 tp->update_flags = TTY_UPDATE_ALL;
570 tty3270_set_timer(tp, 1);
572 spin_unlock_bh(&tp->view.lock);
574 /* Start keyboard reset command. */
575 raw3270_request_reset(tp->kreset);
576 raw3270_request_set_cmd(tp->kreset, TC_WRITE);
577 raw3270_request_add_data(tp->kreset, &kreset_data, 1);
578 raw3270_start(&tp->view, tp->kreset);
580 /* Emit input string. */
581 if (tp->tty) {
582 while (len-- > 0)
583 kbd_keycode(tp->kbd, *input++);
584 /* Emit keycode for AID byte. */
585 kbd_keycode(tp->kbd, 256 + tp->input->string[0]);
588 raw3270_request_reset(rrq);
589 xchg(&tp->read, rrq);
590 raw3270_put_view(&tp->view);
594 * Read request completion callback.
596 static void
597 tty3270_read_callback(struct raw3270_request *rq, void *data)
599 raw3270_get_view(rq->view);
600 /* Schedule tasklet to pass input to tty. */
601 tasklet_schedule(&((struct tty3270 *) rq->view)->readlet);
605 * Issue a read request. Call with device lock.
607 static void
608 tty3270_issue_read(struct tty3270 *tp, int lock)
610 struct raw3270_request *rrq;
611 int rc;
613 rrq = xchg(&tp->read, 0);
614 if (!rrq)
615 /* Read already scheduled. */
616 return;
617 rrq->callback = tty3270_read_callback;
618 rrq->callback_data = tp;
619 raw3270_request_set_cmd(rrq, TC_READMOD);
620 raw3270_request_set_data(rrq, tp->input->string, tp->input->len);
621 /* Issue the read modified request. */
622 if (lock) {
623 rc = raw3270_start(&tp->view, rrq);
624 } else
625 rc = raw3270_start_irq(&tp->view, rrq);
626 if (rc) {
627 raw3270_request_reset(rrq);
628 xchg(&tp->read, rrq);
633 * Switch to the tty view.
635 static int
636 tty3270_activate(struct raw3270_view *view)
638 struct tty3270 *tp;
640 tp = (struct tty3270 *) view;
641 tp->update_flags = TTY_UPDATE_ALL;
642 tty3270_set_timer(tp, 1);
643 return 0;
646 static void
647 tty3270_deactivate(struct raw3270_view *view)
649 struct tty3270 *tp;
651 tp = (struct tty3270 *) view;
652 del_timer(&tp->timer);
655 static int
656 tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
658 /* Handle ATTN. Schedule tasklet to read aid. */
659 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
660 if (!tp->throttle)
661 tty3270_issue_read(tp, 0);
662 else
663 tp->attn = 1;
666 if (rq) {
667 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
668 rq->rc = -EIO;
669 else
670 /* Normal end. Copy residual count. */
671 rq->rescnt = irb->scsw.cmd.count;
673 return RAW3270_IO_DONE;
677 * Allocate tty3270 structure.
679 static struct tty3270 *
680 tty3270_alloc_view(void)
682 struct tty3270 *tp;
683 int pages;
685 tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL);
686 if (!tp)
687 goto out_err;
688 tp->freemem_pages =
689 kmalloc(sizeof(void *) * TTY3270_STRING_PAGES, GFP_KERNEL);
690 if (!tp->freemem_pages)
691 goto out_tp;
692 INIT_LIST_HEAD(&tp->freemem);
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);
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;
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);
732 * Free tty3270 structure.
734 static void
735 tty3270_free_view(struct tty3270 *tp)
737 int pages;
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);
751 * Allocate tty3270 screen.
753 static int
754 tty3270_alloc_screen(struct tty3270 *tp)
756 unsigned long size;
757 int lines;
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;
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;
779 * Free tty3270 screen.
781 static void
782 tty3270_free_screen(struct tty3270 *tp)
784 int lines;
786 for (lines = 0; lines < tp->view.rows - 2; lines++)
787 kfree(tp->screen[lines].cells);
788 kfree(tp->screen);
792 * Unlink tty3270 data structure from tty.
794 static void
795 tty3270_release(struct raw3270_view *view)
797 struct tty3270 *tp;
798 struct tty_struct *tty;
800 tp = (struct tty3270 *) view;
801 tty = tp->tty;
802 if (tty) {
803 tty->driver_data = NULL;
804 tp->tty = tp->kbd->tty = NULL;
805 tty_hangup(tty);
806 raw3270_put_view(&tp->view);
811 * Free tty3270 data structure
813 static void
814 tty3270_free(struct raw3270_view *view)
816 tty3270_free_screen((struct tty3270 *) view);
817 tty3270_free_view((struct tty3270 *) view);
821 * Delayed freeing of tty3270 views.
823 static void
824 tty3270_del_views(void)
826 struct tty3270 *tp;
827 int i;
829 for (i = 0; i < tty3270_max_index; i++) {
830 tp = (struct tty3270 *)
831 raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
832 if (!IS_ERR(tp))
833 raw3270_del_view(&tp->view);
837 static struct raw3270_fn tty3270_fn = {
838 .activate = tty3270_activate,
839 .deactivate = tty3270_deactivate,
840 .intv = (void *) tty3270_irq,
841 .release = tty3270_release,
842 .free = tty3270_free
846 * This routine is called whenever a 3270 tty is opened.
848 static int
849 tty3270_open(struct tty_struct *tty, struct file * filp)
851 struct tty3270 *tp;
852 int i, rc;
854 if (tty->count > 1)
855 return 0;
856 /* Check if the tty3270 is already there. */
857 tp = (struct tty3270 *)
858 raw3270_find_view(&tty3270_fn,
859 tty->index + RAW3270_FIRSTMINOR);
860 if (!IS_ERR(tp)) {
861 tty->driver_data = tp;
862 tty->winsize.ws_row = tp->view.rows - 2;
863 tty->winsize.ws_col = tp->view.cols;
864 tty->low_latency = 0;
865 tp->tty = tty;
866 tp->kbd->tty = tty;
867 tp->inattr = TF_INPUT;
868 return 0;
870 if (tty3270_max_index < tty->index + 1)
871 tty3270_max_index = tty->index + 1;
873 /* Quick exit if there is no device for tty->index. */
874 if (PTR_ERR(tp) == -ENODEV)
875 return -ENODEV;
877 /* Allocate tty3270 structure on first open. */
878 tp = tty3270_alloc_view();
879 if (IS_ERR(tp))
880 return PTR_ERR(tp);
882 INIT_LIST_HEAD(&tp->lines);
883 INIT_LIST_HEAD(&tp->update);
884 INIT_LIST_HEAD(&tp->rcl_lines);
885 tp->rcl_max = 20;
886 setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update,
887 (unsigned long) tp);
888 tasklet_init(&tp->readlet,
889 (void (*)(unsigned long)) tty3270_read_tasklet,
890 (unsigned long) tp->read);
892 rc = raw3270_add_view(&tp->view, &tty3270_fn,
893 tty->index + RAW3270_FIRSTMINOR);
894 if (rc) {
895 tty3270_free_view(tp);
896 return rc;
899 rc = tty3270_alloc_screen(tp);
900 if (rc) {
901 raw3270_put_view(&tp->view);
902 raw3270_del_view(&tp->view);
903 return rc;
906 tp->tty = tty;
907 tty->low_latency = 0;
908 tty->driver_data = tp;
909 tty->winsize.ws_row = tp->view.rows - 2;
910 tty->winsize.ws_col = tp->view.cols;
912 tty3270_create_prompt(tp);
913 tty3270_create_status(tp);
914 tty3270_update_status(tp);
916 /* Create blank line for every line in the tty output area. */
917 for (i = 0; i < tp->view.rows - 2; i++)
918 tty3270_blank_line(tp);
920 tp->kbd->tty = tty;
921 tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty;
922 tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward;
923 tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward;
924 tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward;
925 kbd_ascebc(tp->kbd, tp->view.ascebc);
927 raw3270_activate_view(&tp->view);
928 return 0;
932 * This routine is called when the 3270 tty is closed. We wait
933 * for the remaining request to be completed. Then we clean up.
935 static void
936 tty3270_close(struct tty_struct *tty, struct file * filp)
938 struct tty3270 *tp;
940 if (tty->count > 1)
941 return;
942 tp = (struct tty3270 *) tty->driver_data;
943 if (tp) {
944 tty->driver_data = NULL;
945 tp->tty = tp->kbd->tty = NULL;
946 raw3270_put_view(&tp->view);
951 * We always have room.
953 static int
954 tty3270_write_room(struct tty_struct *tty)
956 return INT_MAX;
960 * Insert character into the screen at the current position with the
961 * current color and highlight. This function does NOT do cursor movement.
963 static void tty3270_put_character(struct tty3270 *tp, char ch)
965 struct tty3270_line *line;
966 struct tty3270_cell *cell;
968 line = tp->screen + tp->cy;
969 if (line->len <= tp->cx) {
970 while (line->len < tp->cx) {
971 cell = line->cells + line->len;
972 cell->character = tp->view.ascebc[' '];
973 cell->highlight = tp->highlight;
974 cell->f_color = tp->f_color;
975 line->len++;
977 line->len++;
979 cell = line->cells + tp->cx;
980 cell->character = tp->view.ascebc[(unsigned int) ch];
981 cell->highlight = tp->highlight;
982 cell->f_color = tp->f_color;
986 * Convert a tty3270_line to a 3270 data fragment usable for output.
988 static void
989 tty3270_convert_line(struct tty3270 *tp, int line_nr)
991 struct tty3270_line *line;
992 struct tty3270_cell *cell;
993 struct string *s, *n;
994 unsigned char highlight;
995 unsigned char f_color;
996 char *cp;
997 int flen, i;
999 /* Determine how long the fragment will be. */
1000 flen = 3; /* Prefix (TO_SBA). */
1001 line = tp->screen + line_nr;
1002 flen += line->len;
1003 highlight = TAX_RESET;
1004 f_color = TAC_RESET;
1005 for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1006 if (cell->highlight != highlight) {
1007 flen += 3; /* TO_SA to switch highlight. */
1008 highlight = cell->highlight;
1010 if (cell->f_color != f_color) {
1011 flen += 3; /* TO_SA to switch color. */
1012 f_color = cell->f_color;
1015 if (highlight != TAX_RESET)
1016 flen += 3; /* TO_SA to reset hightlight. */
1017 if (f_color != TAC_RESET)
1018 flen += 3; /* TO_SA to reset color. */
1019 if (line->len < tp->view.cols)
1020 flen += 4; /* Postfix (TO_RA). */
1022 /* Find the line in the list. */
1023 i = tp->view.rows - 2 - line_nr;
1024 list_for_each_entry_reverse(s, &tp->lines, list)
1025 if (--i <= 0)
1026 break;
1028 * Check if the line needs to get reallocated.
1030 if (s->len != flen) {
1031 /* Reallocate string. */
1032 n = tty3270_alloc_string(tp, flen);
1033 list_add(&n->list, &s->list);
1034 list_del_init(&s->list);
1035 if (!list_empty(&s->update))
1036 list_del_init(&s->update);
1037 free_string(&tp->freemem, s);
1038 s = n;
1041 /* Write 3270 data fragment. */
1042 cp = s->string;
1043 *cp++ = TO_SBA;
1044 *cp++ = 0;
1045 *cp++ = 0;
1047 highlight = TAX_RESET;
1048 f_color = TAC_RESET;
1049 for (i = 0, cell = line->cells; i < line->len; i++, cell++) {
1050 if (cell->highlight != highlight) {
1051 *cp++ = TO_SA;
1052 *cp++ = TAT_EXTHI;
1053 *cp++ = cell->highlight;
1054 highlight = cell->highlight;
1056 if (cell->f_color != f_color) {
1057 *cp++ = TO_SA;
1058 *cp++ = TAT_COLOR;
1059 *cp++ = cell->f_color;
1060 f_color = cell->f_color;
1062 *cp++ = cell->character;
1064 if (highlight != TAX_RESET) {
1065 *cp++ = TO_SA;
1066 *cp++ = TAT_EXTHI;
1067 *cp++ = TAX_RESET;
1069 if (f_color != TAC_RESET) {
1070 *cp++ = TO_SA;
1071 *cp++ = TAT_COLOR;
1072 *cp++ = TAC_RESET;
1074 if (line->len < tp->view.cols) {
1075 *cp++ = TO_RA;
1076 *cp++ = 0;
1077 *cp++ = 0;
1078 *cp++ = 0;
1081 if (tp->nr_up + line_nr < tp->view.rows - 2) {
1082 /* Line is currently visible on screen. */
1083 tty3270_update_string(tp, s, line_nr);
1084 /* Add line to update list. */
1085 if (list_empty(&s->update)) {
1086 list_add_tail(&s->update, &tp->update);
1087 tp->update_flags |= TTY_UPDATE_LIST;
1093 * Do carriage return.
1095 static void
1096 tty3270_cr(struct tty3270 *tp)
1098 tp->cx = 0;
1102 * Do line feed.
1104 static void
1105 tty3270_lf(struct tty3270 *tp)
1107 struct tty3270_line temp;
1108 int i;
1110 tty3270_convert_line(tp, tp->cy);
1111 if (tp->cy < tp->view.rows - 3) {
1112 tp->cy++;
1113 return;
1115 /* Last line just filled up. Add new, blank line. */
1116 tty3270_blank_line(tp);
1117 temp = tp->screen[0];
1118 temp.len = 0;
1119 for (i = 0; i < tp->view.rows - 3; i++)
1120 tp->screen[i] = tp->screen[i+1];
1121 tp->screen[tp->view.rows - 3] = temp;
1122 tty3270_rebuild_update(tp);
1125 static void
1126 tty3270_ri(struct tty3270 *tp)
1128 if (tp->cy > 0) {
1129 tty3270_convert_line(tp, tp->cy);
1130 tp->cy--;
1135 * Insert characters at current position.
1137 static void
1138 tty3270_insert_characters(struct tty3270 *tp, int n)
1140 struct tty3270_line *line;
1141 int k;
1143 line = tp->screen + tp->cy;
1144 while (line->len < tp->cx) {
1145 line->cells[line->len].character = tp->view.ascebc[' '];
1146 line->cells[line->len].highlight = TAX_RESET;
1147 line->cells[line->len].f_color = TAC_RESET;
1148 line->len++;
1150 if (n > tp->view.cols - tp->cx)
1151 n = tp->view.cols - tp->cx;
1152 k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n);
1153 while (k--)
1154 line->cells[tp->cx + n + k] = line->cells[tp->cx + k];
1155 line->len += n;
1156 if (line->len > tp->view.cols)
1157 line->len = tp->view.cols;
1158 while (n-- > 0) {
1159 line->cells[tp->cx + n].character = tp->view.ascebc[' '];
1160 line->cells[tp->cx + n].highlight = tp->highlight;
1161 line->cells[tp->cx + n].f_color = tp->f_color;
1166 * Delete characters at current position.
1168 static void
1169 tty3270_delete_characters(struct tty3270 *tp, int n)
1171 struct tty3270_line *line;
1172 int i;
1174 line = tp->screen + tp->cy;
1175 if (line->len <= tp->cx)
1176 return;
1177 if (line->len - tp->cx <= n) {
1178 line->len = tp->cx;
1179 return;
1181 for (i = tp->cx; i + n < line->len; i++)
1182 line->cells[i] = line->cells[i + n];
1183 line->len -= n;
1187 * Erase characters at current position.
1189 static void
1190 tty3270_erase_characters(struct tty3270 *tp, int n)
1192 struct tty3270_line *line;
1193 struct tty3270_cell *cell;
1195 line = tp->screen + tp->cy;
1196 while (line->len > tp->cx && n-- > 0) {
1197 cell = line->cells + tp->cx++;
1198 cell->character = ' ';
1199 cell->highlight = TAX_RESET;
1200 cell->f_color = TAC_RESET;
1202 tp->cx += n;
1203 tp->cx = min_t(int, tp->cx, tp->view.cols - 1);
1207 * Erase line, 3 different cases:
1208 * Esc [ 0 K Erase from current position to end of line inclusive
1209 * Esc [ 1 K Erase from beginning of line to current position inclusive
1210 * Esc [ 2 K Erase entire line (without moving cursor)
1212 static void
1213 tty3270_erase_line(struct tty3270 *tp, int mode)
1215 struct tty3270_line *line;
1216 struct tty3270_cell *cell;
1217 int i;
1219 line = tp->screen + tp->cy;
1220 if (mode == 0)
1221 line->len = tp->cx;
1222 else if (mode == 1) {
1223 for (i = 0; i < tp->cx; i++) {
1224 cell = line->cells + i;
1225 cell->character = ' ';
1226 cell->highlight = TAX_RESET;
1227 cell->f_color = TAC_RESET;
1229 if (line->len <= tp->cx)
1230 line->len = tp->cx + 1;
1231 } else if (mode == 2)
1232 line->len = 0;
1233 tty3270_convert_line(tp, tp->cy);
1237 * Erase display, 3 different cases:
1238 * Esc [ 0 J Erase from current position to bottom of screen inclusive
1239 * Esc [ 1 J Erase from top of screen to current position inclusive
1240 * Esc [ 2 J Erase entire screen (without moving the cursor)
1242 static void
1243 tty3270_erase_display(struct tty3270 *tp, int mode)
1245 int i;
1247 if (mode == 0) {
1248 tty3270_erase_line(tp, 0);
1249 for (i = tp->cy + 1; i < tp->view.rows - 2; i++) {
1250 tp->screen[i].len = 0;
1251 tty3270_convert_line(tp, i);
1253 } else if (mode == 1) {
1254 for (i = 0; i < tp->cy; i++) {
1255 tp->screen[i].len = 0;
1256 tty3270_convert_line(tp, i);
1258 tty3270_erase_line(tp, 1);
1259 } else if (mode == 2) {
1260 for (i = 0; i < tp->view.rows - 2; i++) {
1261 tp->screen[i].len = 0;
1262 tty3270_convert_line(tp, i);
1265 tty3270_rebuild_update(tp);
1269 * Set attributes found in an escape sequence.
1270 * Esc [ <attr> ; <attr> ; ... m
1272 static void
1273 tty3270_set_attributes(struct tty3270 *tp)
1275 static unsigned char f_colors[] = {
1276 TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE,
1277 TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT
1279 int i, attr;
1281 for (i = 0; i <= tp->esc_npar; i++) {
1282 attr = tp->esc_par[i];
1283 switch (attr) {
1284 case 0: /* Reset */
1285 tp->highlight = TAX_RESET;
1286 tp->f_color = TAC_RESET;
1287 break;
1288 /* Highlight. */
1289 case 4: /* Start underlining. */
1290 tp->highlight = TAX_UNDER;
1291 break;
1292 case 5: /* Start blink. */
1293 tp->highlight = TAX_BLINK;
1294 break;
1295 case 7: /* Start reverse. */
1296 tp->highlight = TAX_REVER;
1297 break;
1298 case 24: /* End underlining */
1299 if (tp->highlight == TAX_UNDER)
1300 tp->highlight = TAX_RESET;
1301 break;
1302 case 25: /* End blink. */
1303 if (tp->highlight == TAX_BLINK)
1304 tp->highlight = TAX_RESET;
1305 break;
1306 case 27: /* End reverse. */
1307 if (tp->highlight == TAX_REVER)
1308 tp->highlight = TAX_RESET;
1309 break;
1310 /* Foreground color. */
1311 case 30: /* Black */
1312 case 31: /* Red */
1313 case 32: /* Green */
1314 case 33: /* Yellow */
1315 case 34: /* Blue */
1316 case 35: /* Magenta */
1317 case 36: /* Cyan */
1318 case 37: /* White */
1319 case 39: /* Black */
1320 tp->f_color = f_colors[attr - 30];
1321 break;
1326 static inline int
1327 tty3270_getpar(struct tty3270 *tp, int ix)
1329 return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1;
1332 static void
1333 tty3270_goto_xy(struct tty3270 *tp, int cx, int cy)
1335 int max_cx = max(0, cx);
1336 int max_cy = max(0, cy);
1338 tp->cx = min_t(int, tp->view.cols - 1, max_cx);
1339 cy = min_t(int, tp->view.rows - 3, max_cy);
1340 if (cy != tp->cy) {
1341 tty3270_convert_line(tp, tp->cy);
1342 tp->cy = cy;
1347 * Process escape sequences. Known sequences:
1348 * Esc 7 Save Cursor Position
1349 * Esc 8 Restore Cursor Position
1350 * Esc [ Pn ; Pn ; .. m Set attributes
1351 * Esc [ Pn ; Pn H Cursor Position
1352 * Esc [ Pn ; Pn f Cursor Position
1353 * Esc [ Pn A Cursor Up
1354 * Esc [ Pn B Cursor Down
1355 * Esc [ Pn C Cursor Forward
1356 * Esc [ Pn D Cursor Backward
1357 * Esc [ Pn G Cursor Horizontal Absolute
1358 * Esc [ Pn X Erase Characters
1359 * Esc [ Ps J Erase in Display
1360 * Esc [ Ps K Erase in Line
1361 * // FIXME: add all the new ones.
1363 * Pn is a numeric parameter, a string of zero or more decimal digits.
1364 * Ps is a selective parameter.
1366 static void
1367 tty3270_escape_sequence(struct tty3270 *tp, char ch)
1369 enum { ESnormal, ESesc, ESsquare, ESgetpars };
1371 if (tp->esc_state == ESnormal) {
1372 if (ch == 0x1b)
1373 /* Starting new escape sequence. */
1374 tp->esc_state = ESesc;
1375 return;
1377 if (tp->esc_state == ESesc) {
1378 tp->esc_state = ESnormal;
1379 switch (ch) {
1380 case '[':
1381 tp->esc_state = ESsquare;
1382 break;
1383 case 'E':
1384 tty3270_cr(tp);
1385 tty3270_lf(tp);
1386 break;
1387 case 'M':
1388 tty3270_ri(tp);
1389 break;
1390 case 'D':
1391 tty3270_lf(tp);
1392 break;
1393 case 'Z': /* Respond ID. */
1394 kbd_puts_queue(tp->tty, "\033[?6c");
1395 break;
1396 case '7': /* Save cursor position. */
1397 tp->saved_cx = tp->cx;
1398 tp->saved_cy = tp->cy;
1399 tp->saved_highlight = tp->highlight;
1400 tp->saved_f_color = tp->f_color;
1401 break;
1402 case '8': /* Restore cursor position. */
1403 tty3270_convert_line(tp, tp->cy);
1404 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1405 tp->highlight = tp->saved_highlight;
1406 tp->f_color = tp->saved_f_color;
1407 break;
1408 case 'c': /* Reset terminal. */
1409 tp->cx = tp->saved_cx = 0;
1410 tp->cy = tp->saved_cy = 0;
1411 tp->highlight = tp->saved_highlight = TAX_RESET;
1412 tp->f_color = tp->saved_f_color = TAC_RESET;
1413 tty3270_erase_display(tp, 2);
1414 break;
1416 return;
1418 if (tp->esc_state == ESsquare) {
1419 tp->esc_state = ESgetpars;
1420 memset(tp->esc_par, 0, sizeof(tp->esc_par));
1421 tp->esc_npar = 0;
1422 tp->esc_ques = (ch == '?');
1423 if (tp->esc_ques)
1424 return;
1426 if (tp->esc_state == ESgetpars) {
1427 if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {
1428 tp->esc_npar++;
1429 return;
1431 if (ch >= '0' && ch <= '9') {
1432 tp->esc_par[tp->esc_npar] *= 10;
1433 tp->esc_par[tp->esc_npar] += ch - '0';
1434 return;
1437 tp->esc_state = ESnormal;
1438 if (ch == 'n' && !tp->esc_ques) {
1439 if (tp->esc_par[0] == 5) /* Status report. */
1440 kbd_puts_queue(tp->tty, "\033[0n");
1441 else if (tp->esc_par[0] == 6) { /* Cursor report. */
1442 char buf[40];
1443 sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1);
1444 kbd_puts_queue(tp->tty, buf);
1446 return;
1448 if (tp->esc_ques)
1449 return;
1450 switch (ch) {
1451 case 'm':
1452 tty3270_set_attributes(tp);
1453 break;
1454 case 'H': /* Set cursor position. */
1455 case 'f':
1456 tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1,
1457 tty3270_getpar(tp, 0) - 1);
1458 break;
1459 case 'd': /* Set y position. */
1460 tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1);
1461 break;
1462 case 'A': /* Cursor up. */
1463 case 'F':
1464 tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0));
1465 break;
1466 case 'B': /* Cursor down. */
1467 case 'e':
1468 case 'E':
1469 tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0));
1470 break;
1471 case 'C': /* Cursor forward. */
1472 case 'a':
1473 tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy);
1474 break;
1475 case 'D': /* Cursor backward. */
1476 tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy);
1477 break;
1478 case 'G': /* Set x position. */
1479 case '`':
1480 tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy);
1481 break;
1482 case 'X': /* Erase Characters. */
1483 tty3270_erase_characters(tp, tty3270_getpar(tp, 0));
1484 break;
1485 case 'J': /* Erase display. */
1486 tty3270_erase_display(tp, tp->esc_par[0]);
1487 break;
1488 case 'K': /* Erase line. */
1489 tty3270_erase_line(tp, tp->esc_par[0]);
1490 break;
1491 case 'P': /* Delete characters. */
1492 tty3270_delete_characters(tp, tty3270_getpar(tp, 0));
1493 break;
1494 case '@': /* Insert characters. */
1495 tty3270_insert_characters(tp, tty3270_getpar(tp, 0));
1496 break;
1497 case 's': /* Save cursor position. */
1498 tp->saved_cx = tp->cx;
1499 tp->saved_cy = tp->cy;
1500 tp->saved_highlight = tp->highlight;
1501 tp->saved_f_color = tp->f_color;
1502 break;
1503 case 'u': /* Restore cursor position. */
1504 tty3270_convert_line(tp, tp->cy);
1505 tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy);
1506 tp->highlight = tp->saved_highlight;
1507 tp->f_color = tp->saved_f_color;
1508 break;
1513 * String write routine for 3270 ttys
1515 static void
1516 tty3270_do_write(struct tty3270 *tp, const unsigned char *buf, int count)
1518 int i_msg, i;
1520 spin_lock_bh(&tp->view.lock);
1521 for (i_msg = 0; !tp->tty->stopped && i_msg < count; i_msg++) {
1522 if (tp->esc_state != 0) {
1523 /* Continue escape sequence. */
1524 tty3270_escape_sequence(tp, buf[i_msg]);
1525 continue;
1528 switch (buf[i_msg]) {
1529 case 0x07: /* '\a' -- Alarm */
1530 tp->wcc |= TW_PLUSALARM;
1531 break;
1532 case 0x08: /* Backspace. */
1533 if (tp->cx > 0) {
1534 tp->cx--;
1535 tty3270_put_character(tp, ' ');
1537 break;
1538 case 0x09: /* '\t' -- Tabulate */
1539 for (i = tp->cx % 8; i < 8; i++) {
1540 if (tp->cx >= tp->view.cols) {
1541 tty3270_cr(tp);
1542 tty3270_lf(tp);
1543 break;
1545 tty3270_put_character(tp, ' ');
1546 tp->cx++;
1548 break;
1549 case 0x0a: /* '\n' -- New Line */
1550 tty3270_cr(tp);
1551 tty3270_lf(tp);
1552 break;
1553 case 0x0c: /* '\f' -- Form Feed */
1554 tty3270_erase_display(tp, 2);
1555 tp->cx = tp->cy = 0;
1556 break;
1557 case 0x0d: /* '\r' -- Carriage Return */
1558 tp->cx = 0;
1559 break;
1560 case 0x0f: /* SuSE "exit alternate mode" */
1561 break;
1562 case 0x1b: /* Start escape sequence. */
1563 tty3270_escape_sequence(tp, buf[i_msg]);
1564 break;
1565 default: /* Insert normal character. */
1566 if (tp->cx >= tp->view.cols) {
1567 tty3270_cr(tp);
1568 tty3270_lf(tp);
1570 tty3270_put_character(tp, buf[i_msg]);
1571 tp->cx++;
1572 break;
1575 /* Convert current line to 3270 data fragment. */
1576 tty3270_convert_line(tp, tp->cy);
1578 /* Setup timer to update display after 1/10 second */
1579 if (!timer_pending(&tp->timer))
1580 tty3270_set_timer(tp, HZ/10);
1582 spin_unlock_bh(&tp->view.lock);
1586 * String write routine for 3270 ttys
1588 static int
1589 tty3270_write(struct tty_struct * tty,
1590 const unsigned char *buf, int count)
1592 struct tty3270 *tp;
1594 tp = tty->driver_data;
1595 if (!tp)
1596 return 0;
1597 if (tp->char_count > 0) {
1598 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1599 tp->char_count = 0;
1601 tty3270_do_write(tp, buf, count);
1602 return count;
1606 * Put single characters to the ttys character buffer
1608 static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
1610 struct tty3270 *tp;
1612 tp = tty->driver_data;
1613 if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
1614 return 0;
1615 tp->char_buf[tp->char_count++] = ch;
1616 return 1;
1620 * Flush all characters from the ttys characeter buffer put there
1621 * by tty3270_put_char.
1623 static void
1624 tty3270_flush_chars(struct tty_struct *tty)
1626 struct tty3270 *tp;
1628 tp = tty->driver_data;
1629 if (!tp)
1630 return;
1631 if (tp->char_count > 0) {
1632 tty3270_do_write(tp, tp->char_buf, tp->char_count);
1633 tp->char_count = 0;
1638 * Returns the number of characters in the output buffer. This is
1639 * used in tty_wait_until_sent to wait until all characters have
1640 * appeared on the screen.
1642 static int
1643 tty3270_chars_in_buffer(struct tty_struct *tty)
1645 return 0;
1648 static void
1649 tty3270_flush_buffer(struct tty_struct *tty)
1654 * Check for visible/invisible input switches
1656 static void
1657 tty3270_set_termios(struct tty_struct *tty, struct ktermios *old)
1659 struct tty3270 *tp;
1660 int new;
1662 tp = tty->driver_data;
1663 if (!tp)
1664 return;
1665 spin_lock_bh(&tp->view.lock);
1666 if (L_ICANON(tty)) {
1667 new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN;
1668 if (new != tp->inattr) {
1669 tp->inattr = new;
1670 tty3270_update_prompt(tp, NULL, 0);
1671 tty3270_set_timer(tp, 1);
1674 spin_unlock_bh(&tp->view.lock);
1678 * Disable reading from a 3270 tty
1680 static void
1681 tty3270_throttle(struct tty_struct * tty)
1683 struct tty3270 *tp;
1685 tp = tty->driver_data;
1686 if (!tp)
1687 return;
1688 tp->throttle = 1;
1692 * Enable reading from a 3270 tty
1694 static void
1695 tty3270_unthrottle(struct tty_struct * tty)
1697 struct tty3270 *tp;
1699 tp = tty->driver_data;
1700 if (!tp)
1701 return;
1702 tp->throttle = 0;
1703 if (tp->attn)
1704 tty3270_issue_read(tp, 1);
1708 * Hang up the tty device.
1710 static void
1711 tty3270_hangup(struct tty_struct *tty)
1713 // FIXME: implement
1716 static void
1717 tty3270_wait_until_sent(struct tty_struct *tty, int timeout)
1721 static int
1722 tty3270_ioctl(struct tty_struct *tty, struct file *file,
1723 unsigned int cmd, unsigned long arg)
1725 struct tty3270 *tp;
1727 tp = tty->driver_data;
1728 if (!tp)
1729 return -ENODEV;
1730 if (tty->flags & (1 << TTY_IO_ERROR))
1731 return -EIO;
1732 return kbd_ioctl(tp->kbd, file, cmd, arg);
1735 #ifdef CONFIG_COMPAT
1736 static long
1737 tty3270_compat_ioctl(struct tty_struct *tty, struct file *file,
1738 unsigned int cmd, unsigned long arg)
1740 struct tty3270 *tp;
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, file, cmd, (unsigned long)compat_ptr(arg));
1749 #endif
1751 static const struct tty_operations tty3270_ops = {
1752 .open = tty3270_open,
1753 .close = tty3270_close,
1754 .write = tty3270_write,
1755 .put_char = tty3270_put_char,
1756 .flush_chars = tty3270_flush_chars,
1757 .write_room = tty3270_write_room,
1758 .chars_in_buffer = tty3270_chars_in_buffer,
1759 .flush_buffer = tty3270_flush_buffer,
1760 .throttle = tty3270_throttle,
1761 .unthrottle = tty3270_unthrottle,
1762 .hangup = tty3270_hangup,
1763 .wait_until_sent = tty3270_wait_until_sent,
1764 .ioctl = tty3270_ioctl,
1765 #ifdef CONFIG_COMPAT
1766 .compat_ioctl = tty3270_compat_ioctl,
1767 #endif
1768 .set_termios = tty3270_set_termios
1772 * 3270 tty registration code called from tty_init().
1773 * Most kernel services (incl. kmalloc) are available at this poimt.
1775 static int __init tty3270_init(void)
1777 struct tty_driver *driver;
1778 int ret;
1780 driver = alloc_tty_driver(RAW3270_MAXDEVS);
1781 if (!driver)
1782 return -ENOMEM;
1785 * Initialize the tty_driver structure
1786 * Entries in tty3270_driver that are NOT initialized:
1787 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1789 driver->owner = THIS_MODULE;
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 | TTY_DRIVER_DYNAMIC_DEV;
1798 tty_set_operations(driver, &tty3270_ops);
1799 ret = tty_register_driver(driver);
1800 if (ret) {
1801 put_tty_driver(driver);
1802 return ret;
1804 tty3270_driver = driver;
1805 return 0;
1808 static void __exit
1809 tty3270_exit(void)
1811 struct tty_driver *driver;
1813 driver = tty3270_driver;
1814 tty3270_driver = NULL;
1815 tty_unregister_driver(driver);
1816 tty3270_del_views();
1819 MODULE_LICENSE("GPL");
1820 MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR);
1822 module_init(tty3270_init);
1823 module_exit(tty3270_exit);