Merge git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb
[linux-2.6] / drivers / s390 / char / sclp_tty.c
1 /*
2  *  drivers/s390/char/sclp_tty.c
3  *    SCLP line mode terminal driver.
4  *
5  *  S390 version
6  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7  *    Author(s): Martin Peschke <mpeschke@de.ibm.com>
8  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
9  */
10
11 #include <linux/module.h>
12 #include <linux/kmod.h>
13 #include <linux/tty.h>
14 #include <linux/tty_driver.h>
15 #include <linux/tty_flip.h>
16 #include <linux/wait.h>
17 #include <linux/slab.h>
18 #include <linux/err.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <asm/uaccess.h>
22
23 #include "ctrlchar.h"
24 #include "sclp.h"
25 #include "sclp_rw.h"
26 #include "sclp_tty.h"
27
28 #define SCLP_TTY_PRINT_HEADER "sclp tty driver: "
29
30 /*
31  * size of a buffer that collects single characters coming in
32  * via sclp_tty_put_char()
33  */
34 #define SCLP_TTY_BUF_SIZE 512
35
36 /*
37  * There is exactly one SCLP terminal, so we can keep things simple
38  * and allocate all variables statically.
39  */
40
41 /* Lock to guard over changes to global variables. */
42 static spinlock_t sclp_tty_lock;
43 /* List of free pages that can be used for console output buffering. */
44 static struct list_head sclp_tty_pages;
45 /* List of full struct sclp_buffer structures ready for output. */
46 static struct list_head sclp_tty_outqueue;
47 /* Counter how many buffers are emitted. */
48 static int sclp_tty_buffer_count;
49 /* Pointer to current console buffer. */
50 static struct sclp_buffer *sclp_ttybuf;
51 /* Timer for delayed output of console messages. */
52 static struct timer_list sclp_tty_timer;
53 /* Waitqueue to wait for buffers to get empty. */
54 static wait_queue_head_t sclp_tty_waitq;
55
56 static struct tty_struct *sclp_tty;
57 static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
58 static unsigned short int sclp_tty_chars_count;
59
60 struct tty_driver *sclp_tty_driver;
61
62 static struct sclp_ioctls sclp_ioctls;
63 static struct sclp_ioctls sclp_ioctls_init =
64 {
65         8,                      /* 1 hor. tab. = 8 spaces */
66         0,                      /* no echo of input by this driver */
67         80,                     /* 80 characters/line */
68         1,                      /* write after 1/10 s without final new line */
69         MAX_KMEM_PAGES,         /* quick fix: avoid __alloc_pages */
70         MAX_KMEM_PAGES,         /* take 32/64 pages from kernel memory, */
71         0,                      /* do not convert to lower case */
72         0x6c                    /* to seprate upper and lower case */
73                                 /* ('%' in EBCDIC) */
74 };
75
76 /* This routine is called whenever we try to open a SCLP terminal. */
77 static int
78 sclp_tty_open(struct tty_struct *tty, struct file *filp)
79 {
80         sclp_tty = tty;
81         tty->driver_data = NULL;
82         tty->low_latency = 0;
83         return 0;
84 }
85
86 /* This routine is called when the SCLP terminal is closed. */
87 static void
88 sclp_tty_close(struct tty_struct *tty, struct file *filp)
89 {
90         if (tty->count > 1)
91                 return;
92         sclp_tty = NULL;
93 }
94
95 /* execute commands to control the i/o behaviour of the SCLP tty at runtime */
96 static int
97 sclp_tty_ioctl(struct tty_struct *tty, struct file * file,
98                unsigned int cmd, unsigned long arg)
99 {
100         unsigned long flags;
101         unsigned int obuf;
102         int check;
103         int rc;
104
105         if (tty->flags & (1 << TTY_IO_ERROR))
106                 return -EIO;
107         rc = 0;
108         check = 0;
109         switch (cmd) {
110         case TIOCSCLPSHTAB:
111                 /* set width of horizontal tab  */
112                 if (get_user(sclp_ioctls.htab, (unsigned short __user *) arg))
113                         rc = -EFAULT;
114                 else
115                         check = 1;
116                 break;
117         case TIOCSCLPGHTAB:
118                 /* get width of horizontal tab  */
119                 if (put_user(sclp_ioctls.htab, (unsigned short __user *) arg))
120                         rc = -EFAULT;
121                 break;
122         case TIOCSCLPSECHO:
123                 /* enable/disable echo of input */
124                 if (get_user(sclp_ioctls.echo, (unsigned char __user *) arg))
125                         rc = -EFAULT;
126                 break;
127         case TIOCSCLPGECHO:
128                 /* Is echo of input enabled ?  */
129                 if (put_user(sclp_ioctls.echo, (unsigned char __user *) arg))
130                         rc = -EFAULT;
131                 break;
132         case TIOCSCLPSCOLS:
133                 /* set number of columns for output  */
134                 if (get_user(sclp_ioctls.columns, (unsigned short __user *) arg))
135                         rc = -EFAULT;
136                 else
137                         check = 1;
138                 break;
139         case TIOCSCLPGCOLS:
140                 /* get number of columns for output  */
141                 if (put_user(sclp_ioctls.columns, (unsigned short __user *) arg))
142                         rc = -EFAULT;
143                 break;
144         case TIOCSCLPSNL:
145                 /* enable/disable writing without final new line character  */
146                 if (get_user(sclp_ioctls.final_nl, (signed char __user *) arg))
147                         rc = -EFAULT;
148                 break;
149         case TIOCSCLPGNL:
150                 /* Is writing without final new line character enabled ?  */
151                 if (put_user(sclp_ioctls.final_nl, (signed char __user *) arg))
152                         rc = -EFAULT;
153                 break;
154         case TIOCSCLPSOBUF:
155                 /*
156                  * set the maximum buffers size for output, will be rounded
157                  * up to next 4kB boundary and stored as number of SCCBs
158                  * (4kB Buffers) limitation: 256 x 4kB
159                  */
160                 if (get_user(obuf, (unsigned int __user *) arg) == 0) {
161                         if (obuf & 0xFFF)
162                                 sclp_ioctls.max_sccb = (obuf >> 12) + 1;
163                         else
164                                 sclp_ioctls.max_sccb = (obuf >> 12);
165                 } else
166                         rc = -EFAULT;
167                 break;
168         case TIOCSCLPGOBUF:
169                 /* get the maximum buffers size for output  */
170                 obuf = sclp_ioctls.max_sccb << 12;
171                 if (put_user(obuf, (unsigned int __user *) arg))
172                         rc = -EFAULT;
173                 break;
174         case TIOCSCLPGKBUF:
175                 /* get the number of buffers got from kernel at startup */
176                 if (put_user(sclp_ioctls.kmem_sccb, (unsigned short __user *) arg))
177                         rc = -EFAULT;
178                 break;
179         case TIOCSCLPSCASE:
180                 /* enable/disable conversion from upper to lower case */
181                 if (get_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
182                         rc = -EFAULT;
183                 break;
184         case TIOCSCLPGCASE:
185                 /* Is conversion from upper to lower case of input enabled? */
186                 if (put_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
187                         rc = -EFAULT;
188                 break;
189         case TIOCSCLPSDELIM:
190                 /*
191                  * set special character used for separating upper and
192                  * lower case, 0x00 disables this feature
193                  */
194                 if (get_user(sclp_ioctls.delim, (unsigned char __user *) arg))
195                         rc = -EFAULT;
196                 break;
197         case TIOCSCLPGDELIM:
198                 /*
199                  * get special character used for separating upper and
200                  * lower case, 0x00 disables this feature
201                  */
202                 if (put_user(sclp_ioctls.delim, (unsigned char __user *) arg))
203                         rc = -EFAULT;
204                 break;
205         case TIOCSCLPSINIT:
206                 /* set initial (default) sclp ioctls  */
207                 sclp_ioctls = sclp_ioctls_init;
208                 check = 1;
209                 break;
210         default:
211                 rc = -ENOIOCTLCMD;
212                 break;
213         }
214         if (check) {
215                 spin_lock_irqsave(&sclp_tty_lock, flags);
216                 if (sclp_ttybuf != NULL) {
217                         sclp_set_htab(sclp_ttybuf, sclp_ioctls.htab);
218                         sclp_set_columns(sclp_ttybuf, sclp_ioctls.columns);
219                 }
220                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
221         }
222         return rc;
223 }
224
225 /*
226  * This routine returns the numbers of characters the tty driver
227  * will accept for queuing to be written.  This number is subject
228  * to change as output buffers get emptied, or if the output flow
229  * control is acted. This is not an exact number because not every
230  * character needs the same space in the sccb. The worst case is
231  * a string of newlines. Every newlines creates a new mto which
232  * needs 8 bytes.
233  */
234 static int
235 sclp_tty_write_room (struct tty_struct *tty)
236 {
237         unsigned long flags;
238         struct list_head *l;
239         int count;
240
241         spin_lock_irqsave(&sclp_tty_lock, flags);
242         count = 0;
243         if (sclp_ttybuf != NULL)
244                 count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
245         list_for_each(l, &sclp_tty_pages)
246                 count += NR_EMPTY_MTO_PER_SCCB;
247         spin_unlock_irqrestore(&sclp_tty_lock, flags);
248         return count;
249 }
250
251 static void
252 sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
253 {
254         unsigned long flags;
255         void *page;
256
257         do {
258                 page = sclp_unmake_buffer(buffer);
259                 spin_lock_irqsave(&sclp_tty_lock, flags);
260                 /* Remove buffer from outqueue */
261                 list_del(&buffer->list);
262                 sclp_tty_buffer_count--;
263                 list_add_tail((struct list_head *) page, &sclp_tty_pages);
264                 /* Check if there is a pending buffer on the out queue. */
265                 buffer = NULL;
266                 if (!list_empty(&sclp_tty_outqueue))
267                         buffer = list_entry(sclp_tty_outqueue.next,
268                                             struct sclp_buffer, list);
269                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
270         } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
271         wake_up(&sclp_tty_waitq);
272         /* check if the tty needs a wake up call */
273         if (sclp_tty != NULL) {
274                 tty_wakeup(sclp_tty);
275         }
276 }
277
278 static inline void
279 __sclp_ttybuf_emit(struct sclp_buffer *buffer)
280 {
281         unsigned long flags;
282         int count;
283         int rc;
284
285         spin_lock_irqsave(&sclp_tty_lock, flags);
286         list_add_tail(&buffer->list, &sclp_tty_outqueue);
287         count = sclp_tty_buffer_count++;
288         spin_unlock_irqrestore(&sclp_tty_lock, flags);
289         if (count)
290                 return;
291         rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
292         if (rc)
293                 sclp_ttybuf_callback(buffer, rc);
294 }
295
296 /*
297  * When this routine is called from the timer then we flush the
298  * temporary write buffer.
299  */
300 static void
301 sclp_tty_timeout(unsigned long data)
302 {
303         unsigned long flags;
304         struct sclp_buffer *buf;
305
306         spin_lock_irqsave(&sclp_tty_lock, flags);
307         buf = sclp_ttybuf;
308         sclp_ttybuf = NULL;
309         spin_unlock_irqrestore(&sclp_tty_lock, flags);
310
311         if (buf != NULL) {
312                 __sclp_ttybuf_emit(buf);
313         }
314 }
315
316 /*
317  * Write a string to the sclp tty.
318  */
319 static void
320 sclp_tty_write_string(const unsigned char *str, int count)
321 {
322         unsigned long flags;
323         void *page;
324         int written;
325         struct sclp_buffer *buf;
326
327         if (count <= 0)
328                 return;
329         spin_lock_irqsave(&sclp_tty_lock, flags);
330         do {
331                 /* Create a sclp output buffer if none exists yet */
332                 if (sclp_ttybuf == NULL) {
333                         while (list_empty(&sclp_tty_pages)) {
334                                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
335                                 if (in_interrupt())
336                                         sclp_sync_wait();
337                                 else
338                                         wait_event(sclp_tty_waitq,
339                                                 !list_empty(&sclp_tty_pages));
340                                 spin_lock_irqsave(&sclp_tty_lock, flags);
341                         }
342                         page = sclp_tty_pages.next;
343                         list_del((struct list_head *) page);
344                         sclp_ttybuf = sclp_make_buffer(page,
345                                                        sclp_ioctls.columns,
346                                                        sclp_ioctls.htab);
347                 }
348                 /* try to write the string to the current output buffer */
349                 written = sclp_write(sclp_ttybuf, str, count);
350                 if (written == count)
351                         break;
352                 /*
353                  * Not all characters could be written to the current
354                  * output buffer. Emit the buffer, create a new buffer
355                  * and then output the rest of the string.
356                  */
357                 buf = sclp_ttybuf;
358                 sclp_ttybuf = NULL;
359                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
360                 __sclp_ttybuf_emit(buf);
361                 spin_lock_irqsave(&sclp_tty_lock, flags);
362                 str += written;
363                 count -= written;
364         } while (count > 0);
365         /* Setup timer to output current console buffer after 1/10 second */
366         if (sclp_ioctls.final_nl) {
367                 if (sclp_ttybuf != NULL &&
368                     sclp_chars_in_buffer(sclp_ttybuf) != 0 &&
369                     !timer_pending(&sclp_tty_timer)) {
370                         init_timer(&sclp_tty_timer);
371                         sclp_tty_timer.function = sclp_tty_timeout;
372                         sclp_tty_timer.data = 0UL;
373                         sclp_tty_timer.expires = jiffies + HZ/10;
374                         add_timer(&sclp_tty_timer);
375                 }
376         } else {
377                 if (sclp_ttybuf != NULL &&
378                     sclp_chars_in_buffer(sclp_ttybuf) != 0) {
379                         buf = sclp_ttybuf;
380                         sclp_ttybuf = NULL;
381                         spin_unlock_irqrestore(&sclp_tty_lock, flags);
382                         __sclp_ttybuf_emit(buf);
383                         spin_lock_irqsave(&sclp_tty_lock, flags);
384                 }
385         }
386         spin_unlock_irqrestore(&sclp_tty_lock, flags);
387 }
388
389 /*
390  * This routine is called by the kernel to write a series of characters to the
391  * tty device. The characters may come from user space or kernel space. This
392  * routine will return the number of characters actually accepted for writing.
393  */
394 static int
395 sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
396 {
397         if (sclp_tty_chars_count > 0) {
398                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
399                 sclp_tty_chars_count = 0;
400         }
401         sclp_tty_write_string(buf, count);
402         return count;
403 }
404
405 /*
406  * This routine is called by the kernel to write a single character to the tty
407  * device. If the kernel uses this routine, it must call the flush_chars()
408  * routine (if defined) when it is done stuffing characters into the driver.
409  *
410  * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
411  * If the given character is a '\n' the contents of the SCLP write buffer
412  * - including previous characters from sclp_tty_put_char() and strings from
413  * sclp_write() without final '\n' - will be written.
414  */
415 static void
416 sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
417 {
418         sclp_tty_chars[sclp_tty_chars_count++] = ch;
419         if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
420                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
421                 sclp_tty_chars_count = 0;
422         }
423 }
424
425 /*
426  * This routine is called by the kernel after it has written a series of
427  * characters to the tty device using put_char().
428  */
429 static void
430 sclp_tty_flush_chars(struct tty_struct *tty)
431 {
432         if (sclp_tty_chars_count > 0) {
433                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
434                 sclp_tty_chars_count = 0;
435         }
436 }
437
438 /*
439  * This routine returns the number of characters in the write buffer of the
440  * SCLP driver. The provided number includes all characters that are stored
441  * in the SCCB (will be written next time the SCLP is not busy) as well as
442  * characters in the write buffer (will not be written as long as there is a
443  * final line feed missing).
444  */
445 static int
446 sclp_tty_chars_in_buffer(struct tty_struct *tty)
447 {
448         unsigned long flags;
449         struct list_head *l;
450         struct sclp_buffer *t;
451         int count;
452
453         spin_lock_irqsave(&sclp_tty_lock, flags);
454         count = 0;
455         if (sclp_ttybuf != NULL)
456                 count = sclp_chars_in_buffer(sclp_ttybuf);
457         list_for_each(l, &sclp_tty_outqueue) {
458                 t = list_entry(l, struct sclp_buffer, list);
459                 count += sclp_chars_in_buffer(t);
460         }
461         spin_unlock_irqrestore(&sclp_tty_lock, flags);
462         return count;
463 }
464
465 /*
466  * removes all content from buffers of low level driver
467  */
468 static void
469 sclp_tty_flush_buffer(struct tty_struct *tty)
470 {
471         if (sclp_tty_chars_count > 0) {
472                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
473                 sclp_tty_chars_count = 0;
474         }
475 }
476
477 /*
478  * push input to tty
479  */
480 static void
481 sclp_tty_input(unsigned char* buf, unsigned int count)
482 {
483         unsigned int cchar;
484
485         /*
486          * If this tty driver is currently closed
487          * then throw the received input away.
488          */
489         if (sclp_tty == NULL)
490                 return;
491         cchar = ctrlchar_handle(buf, count, sclp_tty);
492         switch (cchar & CTRLCHAR_MASK) {
493         case CTRLCHAR_SYSRQ:
494                 break;
495         case CTRLCHAR_CTRL:
496                 tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL);
497                 tty_flip_buffer_push(sclp_tty);
498                 break;
499         case CTRLCHAR_NONE:
500                 /* send (normal) input to line discipline */
501                 if (count < 2 ||
502                     (strncmp((const char *) buf + count - 2, "^n", 2) &&
503                      strncmp((const char *) buf + count - 2, "\252n", 2))) {
504                         /* add the auto \n */
505                         tty_insert_flip_string(sclp_tty, buf, count);
506                         tty_insert_flip_char(sclp_tty, '\n', TTY_NORMAL);
507                 } else
508                         tty_insert_flip_string(sclp_tty, buf, count - 2);
509                 tty_flip_buffer_push(sclp_tty);
510                 break;
511         }
512 }
513
514 /*
515  * get a EBCDIC string in upper/lower case,
516  * find out characters in lower/upper case separated by a special character,
517  * modifiy original string,
518  * returns length of resulting string
519  */
520 static int
521 sclp_switch_cases(unsigned char *buf, int count,
522                   unsigned char delim, int tolower)
523 {
524         unsigned char *ip, *op;
525         int toggle;
526
527         /* initially changing case is off */
528         toggle = 0;
529         ip = op = buf;
530         while (count-- > 0) {
531                 /* compare with special character */
532                 if (*ip == delim) {
533                         /* followed by another special character? */
534                         if (count && ip[1] == delim) {
535                                 /*
536                                  * ... then put a single copy of the special
537                                  * character to the output string
538                                  */
539                                 *op++ = *ip++;
540                                 count--;
541                         } else
542                                 /*
543                                  * ... special character follower by a normal
544                                  * character toggles the case change behaviour
545                                  */
546                                 toggle = ~toggle;
547                         /* skip special character */
548                         ip++;
549                 } else
550                         /* not the special character */
551                         if (toggle)
552                                 /* but case switching is on */
553                                 if (tolower)
554                                         /* switch to uppercase */
555                                         *op++ = _ebc_toupper[(int) *ip++];
556                                 else
557                                         /* switch to lowercase */
558                                         *op++ = _ebc_tolower[(int) *ip++];
559                         else
560                                 /* no case switching, copy the character */
561                                 *op++ = *ip++;
562         }
563         /* return length of reformatted string. */
564         return op - buf;
565 }
566
567 static void
568 sclp_get_input(unsigned char *start, unsigned char *end)
569 {
570         int count;
571
572         count = end - start;
573         /*
574          * if set in ioctl convert EBCDIC to lower case
575          * (modify original input in SCCB)
576          */
577         if (sclp_ioctls.tolower)
578                 EBC_TOLOWER(start, count);
579
580         /*
581          * if set in ioctl find out characters in lower or upper case
582          * (depends on current case) separated by a special character,
583          * works on EBCDIC
584          */
585         if (sclp_ioctls.delim)
586                 count = sclp_switch_cases(start, count,
587                                           sclp_ioctls.delim,
588                                           sclp_ioctls.tolower);
589
590         /* convert EBCDIC to ASCII (modify original input in SCCB) */
591         sclp_ebcasc_str(start, count);
592
593         /* if set in ioctl write operators input to console  */
594         if (sclp_ioctls.echo)
595                 sclp_tty_write(sclp_tty, start, count);
596
597         /* transfer input to high level driver */
598         sclp_tty_input(start, count);
599 }
600
601 static inline struct gds_vector *
602 find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id)
603 {
604         struct gds_vector *vec;
605
606         for (vec = start; vec < end; vec = (void *) vec + vec->length)
607                 if (vec->gds_id == id)
608                         return vec;
609         return NULL;
610 }
611
612 static inline struct gds_subvector *
613 find_gds_subvector(struct gds_subvector *start,
614                    struct gds_subvector *end, u8 key)
615 {
616         struct gds_subvector *subvec;
617
618         for (subvec = start; subvec < end;
619              subvec = (void *) subvec + subvec->length)
620                 if (subvec->key == key)
621                         return subvec;
622         return NULL;
623 }
624
625 static inline void
626 sclp_eval_selfdeftextmsg(struct gds_subvector *start,
627                          struct gds_subvector *end)
628 {
629         struct gds_subvector *subvec;
630
631         subvec = start;
632         while (subvec < end) {
633                 subvec = find_gds_subvector(subvec, end, 0x30);
634                 if (!subvec)
635                         break;
636                 sclp_get_input((unsigned char *)(subvec + 1),
637                                (unsigned char *) subvec + subvec->length);
638                 subvec = (void *) subvec + subvec->length;
639         }
640 }
641
642 static inline void
643 sclp_eval_textcmd(struct gds_subvector *start,
644                   struct gds_subvector *end)
645 {
646         struct gds_subvector *subvec;
647
648         subvec = start;
649         while (subvec < end) {
650                 subvec = find_gds_subvector(subvec, end,
651                                             GDS_KEY_SELFDEFTEXTMSG);
652                 if (!subvec)
653                         break;
654                 sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1),
655                                          (void *)subvec + subvec->length);
656                 subvec = (void *) subvec + subvec->length;
657         }
658 }
659
660 static inline void
661 sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end)
662 {
663         struct gds_vector *vec;
664
665         vec = start;
666         while (vec < end) {
667                 vec = find_gds_vector(vec, end, GDS_ID_TEXTCMD);
668                 if (!vec)
669                         break;
670                 sclp_eval_textcmd((struct gds_subvector *)(vec + 1),
671                                   (void *) vec + vec->length);
672                 vec = (void *) vec + vec->length;
673         }
674 }
675
676
677 static inline void
678 sclp_eval_mdsmu(struct gds_vector *start, void *end)
679 {
680         struct gds_vector *vec;
681
682         vec = find_gds_vector(start, end, GDS_ID_CPMSU);
683         if (vec)
684                 sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length);
685 }
686
687 static void
688 sclp_tty_receiver(struct evbuf_header *evbuf)
689 {
690         struct gds_vector *start, *end, *vec;
691
692         start = (struct gds_vector *)(evbuf + 1);
693         end = (void *) evbuf + evbuf->length;
694         vec = find_gds_vector(start, end, GDS_ID_MDSMU);
695         if (vec)
696                 sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length);
697 }
698
699 static void
700 sclp_tty_state_change(struct sclp_register *reg)
701 {
702 }
703
704 static struct sclp_register sclp_input_event =
705 {
706         .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
707         .state_change_fn = sclp_tty_state_change,
708         .receiver_fn = sclp_tty_receiver
709 };
710
711 static const struct tty_operations sclp_ops = {
712         .open = sclp_tty_open,
713         .close = sclp_tty_close,
714         .write = sclp_tty_write,
715         .put_char = sclp_tty_put_char,
716         .flush_chars = sclp_tty_flush_chars,
717         .write_room = sclp_tty_write_room,
718         .chars_in_buffer = sclp_tty_chars_in_buffer,
719         .flush_buffer = sclp_tty_flush_buffer,
720         .ioctl = sclp_tty_ioctl,
721 };
722
723 static int __init
724 sclp_tty_init(void)
725 {
726         struct tty_driver *driver;
727         void *page;
728         int i;
729         int rc;
730
731         if (!CONSOLE_IS_SCLP)
732                 return 0;
733         driver = alloc_tty_driver(1);
734         if (!driver)
735                 return -ENOMEM;
736
737         rc = sclp_rw_init();
738         if (rc) {
739                 printk(KERN_ERR SCLP_TTY_PRINT_HEADER
740                        "could not register tty - "
741                        "sclp_rw_init returned %d\n", rc);
742                 put_tty_driver(driver);
743                 return rc;
744         }
745         /* Allocate pages for output buffering */
746         INIT_LIST_HEAD(&sclp_tty_pages);
747         for (i = 0; i < MAX_KMEM_PAGES; i++) {
748                 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
749                 if (page == NULL) {
750                         put_tty_driver(driver);
751                         return -ENOMEM;
752                 }
753                 list_add_tail((struct list_head *) page, &sclp_tty_pages);
754         }
755         INIT_LIST_HEAD(&sclp_tty_outqueue);
756         spin_lock_init(&sclp_tty_lock);
757         init_waitqueue_head(&sclp_tty_waitq);
758         init_timer(&sclp_tty_timer);
759         sclp_ttybuf = NULL;
760         sclp_tty_buffer_count = 0;
761         if (MACHINE_IS_VM) {
762                 /*
763                  * save 4 characters for the CPU number
764                  * written at start of each line by VM/CP
765                  */
766                 sclp_ioctls_init.columns = 76;
767                 /* case input lines to lowercase */
768                 sclp_ioctls_init.tolower = 1;
769         }
770         sclp_ioctls = sclp_ioctls_init;
771         sclp_tty_chars_count = 0;
772         sclp_tty = NULL;
773
774         rc = sclp_register(&sclp_input_event);
775         if (rc) {
776                 put_tty_driver(driver);
777                 return rc;
778         }
779
780         driver->owner = THIS_MODULE;
781         driver->driver_name = "sclp_line";
782         driver->name = "sclp_line";
783         driver->major = TTY_MAJOR;
784         driver->minor_start = 64;
785         driver->type = TTY_DRIVER_TYPE_SYSTEM;
786         driver->subtype = SYSTEM_TYPE_TTY;
787         driver->init_termios = tty_std_termios;
788         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
789         driver->init_termios.c_oflag = ONLCR | XTABS;
790         driver->init_termios.c_lflag = ISIG | ECHO;
791         driver->flags = TTY_DRIVER_REAL_RAW;
792         tty_set_operations(driver, &sclp_ops);
793         rc = tty_register_driver(driver);
794         if (rc) {
795                 printk(KERN_ERR SCLP_TTY_PRINT_HEADER
796                        "could not register tty - "
797                        "tty_register_driver returned %d\n", rc);
798                 put_tty_driver(driver);
799                 return rc;
800         }
801         sclp_tty_driver = driver;
802         return 0;
803 }
804 module_init(sclp_tty_init);