blob: a879c139926ac0deb7ed012684813ca90f934113 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/kmod.h>
13#include <linux/tty.h>
14#include <linux/tty_driver.h>
Alan Cox33f0f882006-01-09 20:54:13 -080015#include <linux/tty_flip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/err.h>
17#include <linux/init.h>
18#include <linux/interrupt.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <asm/uaccess.h>
21
22#include "ctrlchar.h"
23#include "sclp.h"
24#include "sclp_rw.h"
25#include "sclp_tty.h"
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027/*
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. */
39static spinlock_t sclp_tty_lock;
40/* List of free pages that can be used for console output buffering. */
41static struct list_head sclp_tty_pages;
42/* List of full struct sclp_buffer structures ready for output. */
43static struct list_head sclp_tty_outqueue;
44/* Counter how many buffers are emitted. */
45static int sclp_tty_buffer_count;
46/* Pointer to current console buffer. */
47static struct sclp_buffer *sclp_ttybuf;
48/* Timer for delayed output of console messages. */
49static struct timer_list sclp_tty_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51static struct tty_struct *sclp_tty;
52static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
53static unsigned short int sclp_tty_chars_count;
54
55struct tty_driver *sclp_tty_driver;
56
Heiko Carstens095761d2008-07-14 09:59:45 +020057static int sclp_tty_tolower;
58static 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) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63/* This routine is called whenever we try to open a SCLP terminal. */
64static int
65sclp_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. */
74static void
75sclp_tty_close(struct tty_struct *tty, struct file *filp)
76{
77 if (tty->count > 1)
78 return;
79 sclp_tty = NULL;
80}
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082/*
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 */
91static int
92sclp_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
108static void
109sclp_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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 /* check if the tty needs a wake up call */
129 if (sclp_tty != NULL) {
130 tty_wakeup(sclp_tty);
131 }
132}
133
134static 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 */
156static void
157sclp_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 */
Heiko Carstens5e345992008-07-14 09:59:46 +0200175static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
177 unsigned long flags;
178 void *page;
179 int written;
Heiko Carstens5e345992008-07-14 09:59:46 +0200180 int overall_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 struct sclp_buffer *buf;
182
183 if (count <= 0)
Heiko Carstens5e345992008-07-14 09:59:46 +0200184 return 0;
185 overall_written = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 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);
Heiko Carstens5e345992008-07-14 09:59:46 +0200192 if (may_fail)
193 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 else
Heiko Carstens5e345992008-07-14 09:59:46 +0200195 sclp_sync_wait();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 spin_lock_irqsave(&sclp_tty_lock, flags);
197 }
198 page = sclp_tty_pages.next;
199 list_del((struct list_head *) page);
Heiko Carstens095761d2008-07-14 09:59:45 +0200200 sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns,
201 SPACES_PER_TAB);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
203 /* try to write the string to the current output buffer */
204 written = sclp_write(sclp_ttybuf, str, count);
Heiko Carstens5e345992008-07-14 09:59:46 +0200205 overall_written += written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 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 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200222 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
230 spin_unlock_irqrestore(&sclp_tty_lock, flags);
Heiko Carstens5e345992008-07-14 09:59:46 +0200231out:
232 return overall_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
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 */
240static int
241sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
242{
243 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200244 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 sclp_tty_chars_count = 0;
246 }
Heiko Carstens5e345992008-07-14 09:59:46 +0200247 return sclp_tty_write_string(buf, count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
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 */
Alan Cox9e7c9a12008-04-30 00:54:00 -0700260static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261sclp_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) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200265 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 sclp_tty_chars_count = 0;
Heiko Carstens5e345992008-07-14 09:59:46 +0200267 }
268 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269}
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 */
275static void
276sclp_tty_flush_chars(struct tty_struct *tty)
277{
278 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200279 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 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 */
291static int
292sclp_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 */
314static void
315sclp_tty_flush_buffer(struct tty_struct *tty)
316{
317 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200318 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 sclp_tty_chars_count = 0;
320 }
321}
322
323/*
324 * push input to tty
325 */
326static void
327sclp_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:
Alan Cox33f0f882006-01-09 20:54:13 -0800342 tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 tty_flip_buffer_push(sclp_tty);
344 break;
345 case CTRLCHAR_NONE:
346 /* send (normal) input to line discipline */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 if (count < 2 ||
Alan Cox33f0f882006-01-09 20:54:13 -0800348 (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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 } else
Alan Cox33f0f882006-01-09 20:54:13 -0800354 tty_insert_flip_string(sclp_tty, buf, count - 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 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 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200366static int sclp_switch_cases(unsigned char *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
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 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200376 if (*ip == CASE_DELIMITER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /* followed by another special character? */
Heiko Carstens095761d2008-07-14 09:59:45 +0200378 if (count && ip[1] == CASE_DELIMITER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 /*
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 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200397 if (sclp_tty_tolower)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 /* 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
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200411static void sclp_get_input(struct gds_subvector *sv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200413 unsigned char *str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 int count;
415
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200416 str = (unsigned char *) (sv + 1);
417 count = sv->length - sizeof(*sv);
Heiko Carstens095761d2008-07-14 09:59:45 +0200418 if (sclp_tty_tolower)
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200419 EBC_TOLOWER(str, count);
420 count = sclp_switch_cases(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 /* convert EBCDIC to ASCII (modify original input in SCCB) */
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200422 sclp_ebcasc_str(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 /* transfer input to high level driver */
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200425 sclp_tty_input(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426}
427
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200428static inline void sclp_eval_selfdeftextmsg(struct gds_subvector *sv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200430 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200432 end = (void *) sv + sv->length;
433 for (sv = sv + 1; (void *) sv < end; sv = (void *) sv + sv->length)
434 if (sv->key == 0x30)
435 sclp_get_input(sv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436}
437
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200438static inline void sclp_eval_textcmd(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200440 struct gds_subvector *sv;
441 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200443 end = (void *) v + v->length;
444 for (sv = (struct gds_subvector *) (v + 1);
445 (void *) sv < end; sv = (void *) sv + sv->length)
446 if (sv->key == GDS_KEY_SELFDEFTEXTMSG)
447 sclp_eval_selfdeftextmsg(sv);
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200451static inline void sclp_eval_cpmsu(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200453 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200455 end = (void *) v + v->length;
456 for (v = v + 1; (void *) v < end; v = (void *) v + v->length)
457 if (v->gds_id == GDS_ID_TEXTCMD)
458 sclp_eval_textcmd(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
461
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200462static inline void sclp_eval_mdsmu(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200464 v = sclp_find_gds_vector(v + 1, (void *) v + v->length, GDS_ID_CPMSU);
465 if (v)
466 sclp_eval_cpmsu(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467}
468
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200469static void sclp_tty_receiver(struct evbuf_header *evbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200471 struct gds_vector *v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200473 v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
474 GDS_ID_MDSMU);
475 if (v)
476 sclp_eval_mdsmu(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
479static void
480sclp_tty_state_change(struct sclp_register *reg)
481{
482}
483
484static struct sclp_register sclp_input_event =
485{
Stefan Haberland6d4740c2007-04-27 16:01:53 +0200486 .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 .state_change_fn = sclp_tty_state_change,
488 .receiver_fn = sclp_tty_receiver
489};
490
Jeff Dikeb68e31d2006-10-02 02:17:18 -0700491static const struct tty_operations sclp_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 .open = sclp_tty_open,
493 .close = sclp_tty_close,
494 .write = sclp_tty_write,
495 .put_char = sclp_tty_put_char,
496 .flush_chars = sclp_tty_flush_chars,
497 .write_room = sclp_tty_write_room,
498 .chars_in_buffer = sclp_tty_chars_in_buffer,
499 .flush_buffer = sclp_tty_flush_buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500};
501
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100502static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503sclp_tty_init(void)
504{
505 struct tty_driver *driver;
506 void *page;
507 int i;
508 int rc;
509
510 if (!CONSOLE_IS_SCLP)
511 return 0;
512 driver = alloc_tty_driver(1);
513 if (!driver)
514 return -ENOMEM;
515
516 rc = sclp_rw_init();
517 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 put_tty_driver(driver);
519 return rc;
520 }
521 /* Allocate pages for output buffering */
522 INIT_LIST_HEAD(&sclp_tty_pages);
523 for (i = 0; i < MAX_KMEM_PAGES; i++) {
524 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
525 if (page == NULL) {
526 put_tty_driver(driver);
527 return -ENOMEM;
528 }
529 list_add_tail((struct list_head *) page, &sclp_tty_pages);
530 }
531 INIT_LIST_HEAD(&sclp_tty_outqueue);
532 spin_lock_init(&sclp_tty_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 init_timer(&sclp_tty_timer);
534 sclp_ttybuf = NULL;
535 sclp_tty_buffer_count = 0;
536 if (MACHINE_IS_VM) {
537 /*
538 * save 4 characters for the CPU number
539 * written at start of each line by VM/CP
540 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200541 sclp_tty_columns = 76;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 /* case input lines to lowercase */
Heiko Carstens095761d2008-07-14 09:59:45 +0200543 sclp_tty_tolower = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 sclp_tty_chars_count = 0;
546 sclp_tty = NULL;
547
548 rc = sclp_register(&sclp_input_event);
549 if (rc) {
550 put_tty_driver(driver);
551 return rc;
552 }
553
554 driver->owner = THIS_MODULE;
555 driver->driver_name = "sclp_line";
556 driver->name = "sclp_line";
557 driver->major = TTY_MAJOR;
558 driver->minor_start = 64;
559 driver->type = TTY_DRIVER_TYPE_SYSTEM;
560 driver->subtype = SYSTEM_TYPE_TTY;
561 driver->init_termios = tty_std_termios;
562 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
563 driver->init_termios.c_oflag = ONLCR | XTABS;
564 driver->init_termios.c_lflag = ISIG | ECHO;
565 driver->flags = TTY_DRIVER_REAL_RAW;
566 tty_set_operations(driver, &sclp_ops);
567 rc = tty_register_driver(driver);
568 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 put_tty_driver(driver);
570 return rc;
571 }
572 sclp_tty_driver = driver;
573 return 0;
574}
575module_init(sclp_tty_init);