Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/kmod.h> | |
13 | #include <linux/tty.h> | |
14 | #include <linux/tty_driver.h> | |
33f0f88f | 15 | #include <linux/tty_flip.h> |
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/err.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <asm/uaccess.h> | |
21 | ||
22 | #include "ctrlchar.h" | |
23 | #include "sclp.h" | |
24 | #include "sclp_rw.h" | |
25 | #include "sclp_tty.h" | |
26 | ||
1da177e4 LT |
27 | /* |
28 | * size of a buffer that collects single characters coming in | |
29 | * via sclp_tty_put_char() | |
30 | */ | |
31 | #define SCLP_TTY_BUF_SIZE 512 | |
32 | ||
33 | /* | |
34 | * There is exactly one SCLP terminal, so we can keep things simple | |
35 | * and allocate all variables statically. | |
36 | */ | |
37 | ||
38 | /* Lock to guard over changes to global variables. */ | |
39 | static spinlock_t sclp_tty_lock; | |
40 | /* List of free pages that can be used for console output buffering. */ | |
41 | static struct list_head sclp_tty_pages; | |
42 | /* List of full struct sclp_buffer structures ready for output. */ | |
43 | static struct list_head sclp_tty_outqueue; | |
44 | /* Counter how many buffers are emitted. */ | |
45 | static int sclp_tty_buffer_count; | |
46 | /* Pointer to current console buffer. */ | |
47 | static struct sclp_buffer *sclp_ttybuf; | |
48 | /* Timer for delayed output of console messages. */ | |
49 | static struct timer_list sclp_tty_timer; | |
1da177e4 LT |
50 | |
51 | static struct tty_struct *sclp_tty; | |
52 | static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE]; | |
53 | static unsigned short int sclp_tty_chars_count; | |
54 | ||
55 | struct tty_driver *sclp_tty_driver; | |
56 | ||
095761d2 HC |
57 | static int sclp_tty_tolower; |
58 | static int sclp_tty_columns = 80; | |
59 | ||
60 | #define SPACES_PER_TAB 8 | |
61 | #define CASE_DELIMITER 0x6c /* to separate upper and lower case (% in EBCDIC) */ | |
1da177e4 LT |
62 | |
63 | /* This routine is called whenever we try to open a SCLP terminal. */ | |
64 | static int | |
65 | sclp_tty_open(struct tty_struct *tty, struct file *filp) | |
66 | { | |
67 | sclp_tty = tty; | |
68 | tty->driver_data = NULL; | |
69 | tty->low_latency = 0; | |
70 | return 0; | |
71 | } | |
72 | ||
73 | /* This routine is called when the SCLP terminal is closed. */ | |
74 | static void | |
75 | sclp_tty_close(struct tty_struct *tty, struct file *filp) | |
76 | { | |
77 | if (tty->count > 1) | |
78 | return; | |
79 | sclp_tty = NULL; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * This routine returns the numbers of characters the tty driver | |
84 | * will accept for queuing to be written. This number is subject | |
85 | * to change as output buffers get emptied, or if the output flow | |
86 | * control is acted. This is not an exact number because not every | |
87 | * character needs the same space in the sccb. The worst case is | |
88 | * a string of newlines. Every newlines creates a new mto which | |
89 | * needs 8 bytes. | |
90 | */ | |
91 | static int | |
92 | sclp_tty_write_room (struct tty_struct *tty) | |
93 | { | |
94 | unsigned long flags; | |
95 | struct list_head *l; | |
96 | int count; | |
97 | ||
98 | spin_lock_irqsave(&sclp_tty_lock, flags); | |
99 | count = 0; | |
100 | if (sclp_ttybuf != NULL) | |
101 | count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto); | |
102 | list_for_each(l, &sclp_tty_pages) | |
103 | count += NR_EMPTY_MTO_PER_SCCB; | |
104 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
105 | return count; | |
106 | } | |
107 | ||
108 | static void | |
109 | sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc) | |
110 | { | |
111 | unsigned long flags; | |
112 | void *page; | |
113 | ||
114 | do { | |
115 | page = sclp_unmake_buffer(buffer); | |
116 | spin_lock_irqsave(&sclp_tty_lock, flags); | |
117 | /* Remove buffer from outqueue */ | |
118 | list_del(&buffer->list); | |
119 | sclp_tty_buffer_count--; | |
120 | list_add_tail((struct list_head *) page, &sclp_tty_pages); | |
121 | /* Check if there is a pending buffer on the out queue. */ | |
122 | buffer = NULL; | |
123 | if (!list_empty(&sclp_tty_outqueue)) | |
124 | buffer = list_entry(sclp_tty_outqueue.next, | |
125 | struct sclp_buffer, list); | |
126 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
127 | } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback)); | |
1da177e4 LT |
128 | /* check if the tty needs a wake up call */ |
129 | if (sclp_tty != NULL) { | |
130 | tty_wakeup(sclp_tty); | |
131 | } | |
132 | } | |
133 | ||
134 | static inline void | |
135 | __sclp_ttybuf_emit(struct sclp_buffer *buffer) | |
136 | { | |
137 | unsigned long flags; | |
138 | int count; | |
139 | int rc; | |
140 | ||
141 | spin_lock_irqsave(&sclp_tty_lock, flags); | |
142 | list_add_tail(&buffer->list, &sclp_tty_outqueue); | |
143 | count = sclp_tty_buffer_count++; | |
144 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
145 | if (count) | |
146 | return; | |
147 | rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback); | |
148 | if (rc) | |
149 | sclp_ttybuf_callback(buffer, rc); | |
150 | } | |
151 | ||
152 | /* | |
153 | * When this routine is called from the timer then we flush the | |
154 | * temporary write buffer. | |
155 | */ | |
156 | static void | |
157 | sclp_tty_timeout(unsigned long data) | |
158 | { | |
159 | unsigned long flags; | |
160 | struct sclp_buffer *buf; | |
161 | ||
162 | spin_lock_irqsave(&sclp_tty_lock, flags); | |
163 | buf = sclp_ttybuf; | |
164 | sclp_ttybuf = NULL; | |
165 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
166 | ||
167 | if (buf != NULL) { | |
168 | __sclp_ttybuf_emit(buf); | |
169 | } | |
170 | } | |
171 | ||
172 | /* | |
173 | * Write a string to the sclp tty. | |
174 | */ | |
5e34599f | 175 | static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail) |
1da177e4 LT |
176 | { |
177 | unsigned long flags; | |
178 | void *page; | |
179 | int written; | |
5e34599f | 180 | int overall_written; |
1da177e4 LT |
181 | struct sclp_buffer *buf; |
182 | ||
183 | if (count <= 0) | |
5e34599f HC |
184 | return 0; |
185 | overall_written = 0; | |
1da177e4 LT |
186 | spin_lock_irqsave(&sclp_tty_lock, flags); |
187 | do { | |
188 | /* Create a sclp output buffer if none exists yet */ | |
189 | if (sclp_ttybuf == NULL) { | |
190 | while (list_empty(&sclp_tty_pages)) { | |
191 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
5e34599f HC |
192 | if (may_fail) |
193 | goto out; | |
1da177e4 | 194 | else |
5e34599f | 195 | sclp_sync_wait(); |
1da177e4 LT |
196 | spin_lock_irqsave(&sclp_tty_lock, flags); |
197 | } | |
198 | page = sclp_tty_pages.next; | |
199 | list_del((struct list_head *) page); | |
095761d2 HC |
200 | sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns, |
201 | SPACES_PER_TAB); | |
1da177e4 LT |
202 | } |
203 | /* try to write the string to the current output buffer */ | |
204 | written = sclp_write(sclp_ttybuf, str, count); | |
5e34599f | 205 | overall_written += written; |
1da177e4 LT |
206 | if (written == count) |
207 | break; | |
208 | /* | |
209 | * Not all characters could be written to the current | |
210 | * output buffer. Emit the buffer, create a new buffer | |
211 | * and then output the rest of the string. | |
212 | */ | |
213 | buf = sclp_ttybuf; | |
214 | sclp_ttybuf = NULL; | |
215 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
216 | __sclp_ttybuf_emit(buf); | |
217 | spin_lock_irqsave(&sclp_tty_lock, flags); | |
218 | str += written; | |
219 | count -= written; | |
220 | } while (count > 0); | |
221 | /* Setup timer to output current console buffer after 1/10 second */ | |
095761d2 HC |
222 | if (sclp_ttybuf && sclp_chars_in_buffer(sclp_ttybuf) && |
223 | !timer_pending(&sclp_tty_timer)) { | |
224 | init_timer(&sclp_tty_timer); | |
225 | sclp_tty_timer.function = sclp_tty_timeout; | |
226 | sclp_tty_timer.data = 0UL; | |
227 | sclp_tty_timer.expires = jiffies + HZ/10; | |
228 | add_timer(&sclp_tty_timer); | |
1da177e4 LT |
229 | } |
230 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
5e34599f HC |
231 | out: |
232 | return overall_written; | |
1da177e4 LT |
233 | } |
234 | ||
235 | /* | |
236 | * This routine is called by the kernel to write a series of characters to the | |
237 | * tty device. The characters may come from user space or kernel space. This | |
238 | * routine will return the number of characters actually accepted for writing. | |
239 | */ | |
240 | static int | |
241 | sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
242 | { | |
243 | if (sclp_tty_chars_count > 0) { | |
5e34599f | 244 | sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); |
1da177e4 LT |
245 | sclp_tty_chars_count = 0; |
246 | } | |
5e34599f | 247 | return sclp_tty_write_string(buf, count, 1); |
1da177e4 LT |
248 | } |
249 | ||
250 | /* | |
251 | * This routine is called by the kernel to write a single character to the tty | |
252 | * device. If the kernel uses this routine, it must call the flush_chars() | |
253 | * routine (if defined) when it is done stuffing characters into the driver. | |
254 | * | |
255 | * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver. | |
256 | * If the given character is a '\n' the contents of the SCLP write buffer | |
257 | * - including previous characters from sclp_tty_put_char() and strings from | |
258 | * sclp_write() without final '\n' - will be written. | |
259 | */ | |
9e7c9a19 | 260 | static int |
1da177e4 LT |
261 | sclp_tty_put_char(struct tty_struct *tty, unsigned char ch) |
262 | { | |
263 | sclp_tty_chars[sclp_tty_chars_count++] = ch; | |
264 | if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) { | |
5e34599f | 265 | sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); |
1da177e4 | 266 | sclp_tty_chars_count = 0; |
5e34599f HC |
267 | } |
268 | return 1; | |
1da177e4 LT |
269 | } |
270 | ||
271 | /* | |
272 | * This routine is called by the kernel after it has written a series of | |
273 | * characters to the tty device using put_char(). | |
274 | */ | |
275 | static void | |
276 | sclp_tty_flush_chars(struct tty_struct *tty) | |
277 | { | |
278 | if (sclp_tty_chars_count > 0) { | |
5e34599f | 279 | sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); |
1da177e4 LT |
280 | sclp_tty_chars_count = 0; |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * This routine returns the number of characters in the write buffer of the | |
286 | * SCLP driver. The provided number includes all characters that are stored | |
287 | * in the SCCB (will be written next time the SCLP is not busy) as well as | |
288 | * characters in the write buffer (will not be written as long as there is a | |
289 | * final line feed missing). | |
290 | */ | |
291 | static int | |
292 | sclp_tty_chars_in_buffer(struct tty_struct *tty) | |
293 | { | |
294 | unsigned long flags; | |
295 | struct list_head *l; | |
296 | struct sclp_buffer *t; | |
297 | int count; | |
298 | ||
299 | spin_lock_irqsave(&sclp_tty_lock, flags); | |
300 | count = 0; | |
301 | if (sclp_ttybuf != NULL) | |
302 | count = sclp_chars_in_buffer(sclp_ttybuf); | |
303 | list_for_each(l, &sclp_tty_outqueue) { | |
304 | t = list_entry(l, struct sclp_buffer, list); | |
305 | count += sclp_chars_in_buffer(t); | |
306 | } | |
307 | spin_unlock_irqrestore(&sclp_tty_lock, flags); | |
308 | return count; | |
309 | } | |
310 | ||
311 | /* | |
312 | * removes all content from buffers of low level driver | |
313 | */ | |
314 | static void | |
315 | sclp_tty_flush_buffer(struct tty_struct *tty) | |
316 | { | |
317 | if (sclp_tty_chars_count > 0) { | |
5e34599f | 318 | sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); |
1da177e4 LT |
319 | sclp_tty_chars_count = 0; |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * push input to tty | |
325 | */ | |
326 | static void | |
327 | sclp_tty_input(unsigned char* buf, unsigned int count) | |
328 | { | |
329 | unsigned int cchar; | |
330 | ||
331 | /* | |
332 | * If this tty driver is currently closed | |
333 | * then throw the received input away. | |
334 | */ | |
335 | if (sclp_tty == NULL) | |
336 | return; | |
337 | cchar = ctrlchar_handle(buf, count, sclp_tty); | |
338 | switch (cchar & CTRLCHAR_MASK) { | |
339 | case CTRLCHAR_SYSRQ: | |
340 | break; | |
341 | case CTRLCHAR_CTRL: | |
33f0f88f | 342 | tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL); |
1da177e4 LT |
343 | tty_flip_buffer_push(sclp_tty); |
344 | break; | |
345 | case CTRLCHAR_NONE: | |
346 | /* send (normal) input to line discipline */ | |
1da177e4 | 347 | if (count < 2 || |
33f0f88f AC |
348 | (strncmp((const char *) buf + count - 2, "^n", 2) && |
349 | strncmp((const char *) buf + count - 2, "\252n", 2))) { | |
350 | /* add the auto \n */ | |
351 | tty_insert_flip_string(sclp_tty, buf, count); | |
352 | tty_insert_flip_char(sclp_tty, '\n', TTY_NORMAL); | |
1da177e4 | 353 | } else |
33f0f88f | 354 | tty_insert_flip_string(sclp_tty, buf, count - 2); |
1da177e4 LT |
355 | tty_flip_buffer_push(sclp_tty); |
356 | break; | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * get a EBCDIC string in upper/lower case, | |
362 | * find out characters in lower/upper case separated by a special character, | |
363 | * modifiy original string, | |
364 | * returns length of resulting string | |
365 | */ | |
095761d2 | 366 | static int sclp_switch_cases(unsigned char *buf, int count) |
1da177e4 LT |
367 | { |
368 | unsigned char *ip, *op; | |
369 | int toggle; | |
370 | ||
371 | /* initially changing case is off */ | |
372 | toggle = 0; | |
373 | ip = op = buf; | |
374 | while (count-- > 0) { | |
375 | /* compare with special character */ | |
095761d2 | 376 | if (*ip == CASE_DELIMITER) { |
1da177e4 | 377 | /* followed by another special character? */ |
095761d2 | 378 | if (count && ip[1] == CASE_DELIMITER) { |
1da177e4 LT |
379 | /* |
380 | * ... then put a single copy of the special | |
381 | * character to the output string | |
382 | */ | |
383 | *op++ = *ip++; | |
384 | count--; | |
385 | } else | |
386 | /* | |
387 | * ... special character follower by a normal | |
388 | * character toggles the case change behaviour | |
389 | */ | |
390 | toggle = ~toggle; | |
391 | /* skip special character */ | |
392 | ip++; | |
393 | } else | |
394 | /* not the special character */ | |
395 | if (toggle) | |
396 | /* but case switching is on */ | |
095761d2 | 397 | if (sclp_tty_tolower) |
1da177e4 LT |
398 | /* switch to uppercase */ |
399 | *op++ = _ebc_toupper[(int) *ip++]; | |
400 | else | |
401 | /* switch to lowercase */ | |
402 | *op++ = _ebc_tolower[(int) *ip++]; | |
403 | else | |
404 | /* no case switching, copy the character */ | |
405 | *op++ = *ip++; | |
406 | } | |
407 | /* return length of reformatted string. */ | |
408 | return op - buf; | |
409 | } | |
410 | ||
411 | static void | |
412 | sclp_get_input(unsigned char *start, unsigned char *end) | |
413 | { | |
414 | int count; | |
415 | ||
416 | count = end - start; | |
095761d2 | 417 | if (sclp_tty_tolower) |
1da177e4 | 418 | EBC_TOLOWER(start, count); |
095761d2 | 419 | count = sclp_switch_cases(start, count); |
1da177e4 LT |
420 | /* convert EBCDIC to ASCII (modify original input in SCCB) */ |
421 | sclp_ebcasc_str(start, count); | |
422 | ||
1da177e4 LT |
423 | /* transfer input to high level driver */ |
424 | sclp_tty_input(start, count); | |
425 | } | |
426 | ||
427 | static inline struct gds_vector * | |
428 | find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id) | |
429 | { | |
430 | struct gds_vector *vec; | |
431 | ||
432 | for (vec = start; vec < end; vec = (void *) vec + vec->length) | |
433 | if (vec->gds_id == id) | |
434 | return vec; | |
435 | return NULL; | |
436 | } | |
437 | ||
438 | static inline struct gds_subvector * | |
439 | find_gds_subvector(struct gds_subvector *start, | |
440 | struct gds_subvector *end, u8 key) | |
441 | { | |
442 | struct gds_subvector *subvec; | |
443 | ||
444 | for (subvec = start; subvec < end; | |
445 | subvec = (void *) subvec + subvec->length) | |
446 | if (subvec->key == key) | |
447 | return subvec; | |
448 | return NULL; | |
449 | } | |
450 | ||
451 | static inline void | |
452 | sclp_eval_selfdeftextmsg(struct gds_subvector *start, | |
453 | struct gds_subvector *end) | |
454 | { | |
455 | struct gds_subvector *subvec; | |
456 | ||
457 | subvec = start; | |
458 | while (subvec < end) { | |
459 | subvec = find_gds_subvector(subvec, end, 0x30); | |
460 | if (!subvec) | |
461 | break; | |
462 | sclp_get_input((unsigned char *)(subvec + 1), | |
463 | (unsigned char *) subvec + subvec->length); | |
464 | subvec = (void *) subvec + subvec->length; | |
465 | } | |
466 | } | |
467 | ||
468 | static inline void | |
469 | sclp_eval_textcmd(struct gds_subvector *start, | |
470 | struct gds_subvector *end) | |
471 | { | |
472 | struct gds_subvector *subvec; | |
473 | ||
474 | subvec = start; | |
475 | while (subvec < end) { | |
476 | subvec = find_gds_subvector(subvec, end, | |
6d4740c8 | 477 | GDS_KEY_SELFDEFTEXTMSG); |
1da177e4 LT |
478 | if (!subvec) |
479 | break; | |
480 | sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1), | |
481 | (void *)subvec + subvec->length); | |
482 | subvec = (void *) subvec + subvec->length; | |
483 | } | |
484 | } | |
485 | ||
486 | static inline void | |
487 | sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end) | |
488 | { | |
489 | struct gds_vector *vec; | |
490 | ||
491 | vec = start; | |
492 | while (vec < end) { | |
6d4740c8 | 493 | vec = find_gds_vector(vec, end, GDS_ID_TEXTCMD); |
1da177e4 LT |
494 | if (!vec) |
495 | break; | |
496 | sclp_eval_textcmd((struct gds_subvector *)(vec + 1), | |
497 | (void *) vec + vec->length); | |
498 | vec = (void *) vec + vec->length; | |
499 | } | |
500 | } | |
501 | ||
502 | ||
503 | static inline void | |
504 | sclp_eval_mdsmu(struct gds_vector *start, void *end) | |
505 | { | |
506 | struct gds_vector *vec; | |
507 | ||
508 | vec = find_gds_vector(start, end, GDS_ID_CPMSU); | |
509 | if (vec) | |
510 | sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length); | |
511 | } | |
512 | ||
513 | static void | |
514 | sclp_tty_receiver(struct evbuf_header *evbuf) | |
515 | { | |
516 | struct gds_vector *start, *end, *vec; | |
517 | ||
518 | start = (struct gds_vector *)(evbuf + 1); | |
519 | end = (void *) evbuf + evbuf->length; | |
520 | vec = find_gds_vector(start, end, GDS_ID_MDSMU); | |
521 | if (vec) | |
522 | sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length); | |
523 | } | |
524 | ||
525 | static void | |
526 | sclp_tty_state_change(struct sclp_register *reg) | |
527 | { | |
528 | } | |
529 | ||
530 | static struct sclp_register sclp_input_event = | |
531 | { | |
6d4740c8 | 532 | .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK, |
1da177e4 LT |
533 | .state_change_fn = sclp_tty_state_change, |
534 | .receiver_fn = sclp_tty_receiver | |
535 | }; | |
536 | ||
b68e31d0 | 537 | static const struct tty_operations sclp_ops = { |
1da177e4 LT |
538 | .open = sclp_tty_open, |
539 | .close = sclp_tty_close, | |
540 | .write = sclp_tty_write, | |
541 | .put_char = sclp_tty_put_char, | |
542 | .flush_chars = sclp_tty_flush_chars, | |
543 | .write_room = sclp_tty_write_room, | |
544 | .chars_in_buffer = sclp_tty_chars_in_buffer, | |
545 | .flush_buffer = sclp_tty_flush_buffer, | |
1da177e4 LT |
546 | }; |
547 | ||
2b67fc46 | 548 | static int __init |
1da177e4 LT |
549 | sclp_tty_init(void) |
550 | { | |
551 | struct tty_driver *driver; | |
552 | void *page; | |
553 | int i; | |
554 | int rc; | |
555 | ||
556 | if (!CONSOLE_IS_SCLP) | |
557 | return 0; | |
558 | driver = alloc_tty_driver(1); | |
559 | if (!driver) | |
560 | return -ENOMEM; | |
561 | ||
562 | rc = sclp_rw_init(); | |
563 | if (rc) { | |
1da177e4 LT |
564 | put_tty_driver(driver); |
565 | return rc; | |
566 | } | |
567 | /* Allocate pages for output buffering */ | |
568 | INIT_LIST_HEAD(&sclp_tty_pages); | |
569 | for (i = 0; i < MAX_KMEM_PAGES; i++) { | |
570 | page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
571 | if (page == NULL) { | |
572 | put_tty_driver(driver); | |
573 | return -ENOMEM; | |
574 | } | |
575 | list_add_tail((struct list_head *) page, &sclp_tty_pages); | |
576 | } | |
577 | INIT_LIST_HEAD(&sclp_tty_outqueue); | |
578 | spin_lock_init(&sclp_tty_lock); | |
1da177e4 LT |
579 | init_timer(&sclp_tty_timer); |
580 | sclp_ttybuf = NULL; | |
581 | sclp_tty_buffer_count = 0; | |
582 | if (MACHINE_IS_VM) { | |
583 | /* | |
584 | * save 4 characters for the CPU number | |
585 | * written at start of each line by VM/CP | |
586 | */ | |
095761d2 | 587 | sclp_tty_columns = 76; |
1da177e4 | 588 | /* case input lines to lowercase */ |
095761d2 | 589 | sclp_tty_tolower = 1; |
1da177e4 | 590 | } |
1da177e4 LT |
591 | sclp_tty_chars_count = 0; |
592 | sclp_tty = NULL; | |
593 | ||
594 | rc = sclp_register(&sclp_input_event); | |
595 | if (rc) { | |
596 | put_tty_driver(driver); | |
597 | return rc; | |
598 | } | |
599 | ||
600 | driver->owner = THIS_MODULE; | |
601 | driver->driver_name = "sclp_line"; | |
602 | driver->name = "sclp_line"; | |
603 | driver->major = TTY_MAJOR; | |
604 | driver->minor_start = 64; | |
605 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
606 | driver->subtype = SYSTEM_TYPE_TTY; | |
607 | driver->init_termios = tty_std_termios; | |
608 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
609 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
610 | driver->init_termios.c_lflag = ISIG | ECHO; | |
611 | driver->flags = TTY_DRIVER_REAL_RAW; | |
612 | tty_set_operations(driver, &sclp_ops); | |
613 | rc = tty_register_driver(driver); | |
614 | if (rc) { | |
1da177e4 LT |
615 | put_tty_driver(driver); |
616 | return rc; | |
617 | } | |
618 | sclp_tty_driver = driver; | |
619 | return 0; | |
620 | } | |
621 | module_init(sclp_tty_init); |