Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Provide access to virtual console memory. |
3 | * /dev/vcs0: the screen as it is being viewed right now (possibly scrolled) | |
4 | * /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63) | |
5 | * [minor: N] | |
6 | * | |
7 | * /dev/vcsaN: idem, but including attributes, and prefixed with | |
8 | * the 4 bytes lines,columns,x,y (as screendump used to give). | |
9 | * Attribute/character pair is in native endianity. | |
10 | * [minor: N+128] | |
11 | * | |
12 | * This replaces screendump and part of selection, so that the system | |
13 | * administrator can control access using file system permissions. | |
14 | * | |
15 | * aeb@cwi.nl - efter Friedas begravelse - 950211 | |
16 | * | |
17 | * machek@k332.feld.cvut.cz - modified not to send characters to wrong console | |
18 | * - fixed some fatal off-by-one bugs (0-- no longer == -1 -> looping and looping and looping...) | |
19 | * - making it shorter - scr_readw are macros which expand in PRETTY long code | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/kernel.h> |
23 | #include <linux/major.h> | |
24 | #include <linux/errno.h> | |
0e648f42 | 25 | #include <linux/export.h> |
1da177e4 | 26 | #include <linux/tty.h> |
1da177e4 LT |
27 | #include <linux/interrupt.h> |
28 | #include <linux/mm.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/vt_kern.h> | |
31 | #include <linux/selection.h> | |
32 | #include <linux/kbd_kern.h> | |
33 | #include <linux/console.h> | |
1da177e4 | 34 | #include <linux/device.h> |
47725ac7 NP |
35 | #include <linux/sched.h> |
36 | #include <linux/fs.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/signal.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/notifier.h> | |
c831c338 | 41 | |
1da177e4 LT |
42 | #include <asm/uaccess.h> |
43 | #include <asm/byteorder.h> | |
44 | #include <asm/unaligned.h> | |
45 | ||
46 | #undef attr | |
47 | #undef org | |
48 | #undef addr | |
49 | #define HEADER_SIZE 4 | |
50 | ||
fcdba07e JO |
51 | #define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE) |
52 | ||
47725ac7 NP |
53 | struct vcs_poll_data { |
54 | struct notifier_block notifier; | |
55 | unsigned int cons_num; | |
56 | bool seen_last_update; | |
57 | wait_queue_head_t waitq; | |
58 | struct fasync_struct *fasync; | |
59 | }; | |
60 | ||
61 | static int | |
62 | vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param) | |
63 | { | |
64 | struct vt_notifier_param *param = _param; | |
65 | struct vc_data *vc = param->vc; | |
66 | struct vcs_poll_data *poll = | |
67 | container_of(nb, struct vcs_poll_data, notifier); | |
68 | int currcons = poll->cons_num; | |
69 | ||
70 | if (code != VT_UPDATE) | |
71 | return NOTIFY_DONE; | |
72 | ||
73 | if (currcons == 0) | |
74 | currcons = fg_console; | |
75 | else | |
76 | currcons--; | |
77 | if (currcons != vc->vc_num) | |
78 | return NOTIFY_DONE; | |
79 | ||
80 | poll->seen_last_update = false; | |
81 | wake_up_interruptible(&poll->waitq); | |
82 | kill_fasync(&poll->fasync, SIGIO, POLL_IN); | |
83 | return NOTIFY_OK; | |
84 | } | |
85 | ||
86 | static void | |
87 | vcs_poll_data_free(struct vcs_poll_data *poll) | |
88 | { | |
89 | unregister_vt_notifier(&poll->notifier); | |
90 | kfree(poll); | |
91 | } | |
92 | ||
93 | static struct vcs_poll_data * | |
94 | vcs_poll_data_get(struct file *file) | |
95 | { | |
96 | struct vcs_poll_data *poll = file->private_data; | |
97 | ||
98 | if (poll) | |
99 | return poll; | |
100 | ||
101 | poll = kzalloc(sizeof(*poll), GFP_KERNEL); | |
102 | if (!poll) | |
103 | return NULL; | |
496ad9aa | 104 | poll->cons_num = iminor(file_inode(file)) & 127; |
47725ac7 NP |
105 | init_waitqueue_head(&poll->waitq); |
106 | poll->notifier.notifier_call = vcs_notifier; | |
107 | if (register_vt_notifier(&poll->notifier) != 0) { | |
108 | kfree(poll); | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | /* | |
113 | * This code may be called either through ->poll() or ->fasync(). | |
114 | * If we have two threads using the same file descriptor, they could | |
115 | * both enter this function, both notice that the structure hasn't | |
116 | * been allocated yet and go ahead allocating it in parallel, but | |
117 | * only one of them must survive and be shared otherwise we'd leak | |
118 | * memory with a dangling notifier callback. | |
119 | */ | |
120 | spin_lock(&file->f_lock); | |
121 | if (!file->private_data) { | |
122 | file->private_data = poll; | |
123 | } else { | |
124 | /* someone else raced ahead of us */ | |
125 | vcs_poll_data_free(poll); | |
126 | poll = file->private_data; | |
127 | } | |
128 | spin_unlock(&file->f_lock); | |
129 | ||
130 | return poll; | |
131 | } | |
132 | ||
fcdba07e JO |
133 | /* |
134 | * Returns VC for inode. | |
135 | * Must be called with console_lock. | |
136 | */ | |
137 | static struct vc_data* | |
138 | vcs_vc(struct inode *inode, int *viewed) | |
139 | { | |
140 | unsigned int currcons = iminor(inode) & 127; | |
141 | ||
142 | WARN_CONSOLE_UNLOCKED(); | |
143 | ||
144 | if (currcons == 0) { | |
145 | currcons = fg_console; | |
146 | if (viewed) | |
147 | *viewed = 1; | |
148 | } else { | |
149 | currcons--; | |
150 | if (viewed) | |
151 | *viewed = 0; | |
152 | } | |
153 | return vc_cons[currcons].d; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Returns size for VC carried by inode. | |
158 | * Must be called with console_lock. | |
159 | */ | |
1da177e4 LT |
160 | static int |
161 | vcs_size(struct inode *inode) | |
162 | { | |
163 | int size; | |
164 | int minor = iminor(inode); | |
1da177e4 LT |
165 | struct vc_data *vc; |
166 | ||
fcdba07e JO |
167 | WARN_CONSOLE_UNLOCKED(); |
168 | ||
169 | vc = vcs_vc(inode, NULL); | |
170 | if (!vc) | |
1da177e4 | 171 | return -ENXIO; |
1da177e4 LT |
172 | |
173 | size = vc->vc_rows * vc->vc_cols; | |
174 | ||
175 | if (minor & 128) | |
176 | size = 2*size + HEADER_SIZE; | |
177 | return size; | |
178 | } | |
179 | ||
180 | static loff_t vcs_lseek(struct file *file, loff_t offset, int orig) | |
181 | { | |
182 | int size; | |
183 | ||
dc1892c4 | 184 | console_lock(); |
496ad9aa | 185 | size = vcs_size(file_inode(file)); |
dc1892c4 | 186 | console_unlock(); |
fcdba07e | 187 | if (size < 0) |
dc1892c4 | 188 | return size; |
1da177e4 LT |
189 | switch (orig) { |
190 | default: | |
1da177e4 LT |
191 | return -EINVAL; |
192 | case 2: | |
193 | offset += size; | |
194 | break; | |
195 | case 1: | |
196 | offset += file->f_pos; | |
197 | case 0: | |
198 | break; | |
199 | } | |
200 | if (offset < 0 || offset > size) { | |
1da177e4 LT |
201 | return -EINVAL; |
202 | } | |
203 | file->f_pos = offset; | |
1da177e4 LT |
204 | return file->f_pos; |
205 | } | |
206 | ||
207 | ||
208 | static ssize_t | |
209 | vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
210 | { | |
496ad9aa | 211 | struct inode *inode = file_inode(file); |
1da177e4 LT |
212 | unsigned int currcons = iminor(inode); |
213 | struct vc_data *vc; | |
47725ac7 | 214 | struct vcs_poll_data *poll; |
1da177e4 | 215 | long pos; |
fcdba07e JO |
216 | long attr, read; |
217 | int col, maxcol, viewed; | |
1da177e4 LT |
218 | unsigned short *org = NULL; |
219 | ssize_t ret; | |
fcdba07e | 220 | char *con_buf; |
1da177e4 | 221 | |
fcdba07e JO |
222 | con_buf = (char *) __get_free_page(GFP_KERNEL); |
223 | if (!con_buf) | |
224 | return -ENOMEM; | |
1da177e4 LT |
225 | |
226 | pos = *ppos; | |
227 | ||
228 | /* Select the proper current console and verify | |
229 | * sanity of the situation under the console lock. | |
230 | */ | |
ac751efa | 231 | console_lock(); |
1da177e4 LT |
232 | |
233 | attr = (currcons & 128); | |
1da177e4 | 234 | ret = -ENXIO; |
fcdba07e JO |
235 | vc = vcs_vc(inode, &viewed); |
236 | if (!vc) | |
1da177e4 | 237 | goto unlock_out; |
1da177e4 LT |
238 | |
239 | ret = -EINVAL; | |
240 | if (pos < 0) | |
241 | goto unlock_out; | |
47725ac7 NP |
242 | poll = file->private_data; |
243 | if (count && poll) | |
244 | poll->seen_last_update = true; | |
1da177e4 LT |
245 | read = 0; |
246 | ret = 0; | |
247 | while (count) { | |
248 | char *con_buf0, *con_buf_start; | |
249 | long this_round, size; | |
250 | ssize_t orig_count; | |
251 | long p = pos; | |
252 | ||
253 | /* Check whether we are above size each round, | |
254 | * as copy_to_user at the end of this loop | |
255 | * could sleep. | |
256 | */ | |
257 | size = vcs_size(inode); | |
dc1892c4 JO |
258 | if (size < 0) { |
259 | if (read) | |
260 | break; | |
261 | ret = size; | |
262 | goto unlock_out; | |
263 | } | |
1da177e4 LT |
264 | if (pos >= size) |
265 | break; | |
266 | if (count > size - pos) | |
267 | count = size - pos; | |
268 | ||
269 | this_round = count; | |
270 | if (this_round > CON_BUF_SIZE) | |
271 | this_round = CON_BUF_SIZE; | |
272 | ||
273 | /* Perform the whole read into the local con_buf. | |
274 | * Then we can drop the console spinlock and safely | |
275 | * attempt to move it to userspace. | |
276 | */ | |
277 | ||
278 | con_buf_start = con_buf0 = con_buf; | |
279 | orig_count = this_round; | |
280 | maxcol = vc->vc_cols; | |
281 | if (!attr) { | |
282 | org = screen_pos(vc, p, viewed); | |
283 | col = p % maxcol; | |
284 | p += maxcol - col; | |
285 | while (this_round-- > 0) { | |
286 | *con_buf0++ = (vcs_scr_readw(vc, org++) & 0xff); | |
287 | if (++col == maxcol) { | |
288 | org = screen_pos(vc, p, viewed); | |
289 | col = 0; | |
290 | p += maxcol; | |
291 | } | |
292 | } | |
293 | } else { | |
294 | if (p < HEADER_SIZE) { | |
295 | size_t tmp_count; | |
296 | ||
297 | con_buf0[0] = (char)vc->vc_rows; | |
298 | con_buf0[1] = (char)vc->vc_cols; | |
299 | getconsxy(vc, con_buf0 + 2); | |
300 | ||
301 | con_buf_start += p; | |
302 | this_round += p; | |
303 | if (this_round > CON_BUF_SIZE) { | |
304 | this_round = CON_BUF_SIZE; | |
305 | orig_count = this_round - p; | |
306 | } | |
307 | ||
308 | tmp_count = HEADER_SIZE; | |
309 | if (tmp_count > this_round) | |
310 | tmp_count = this_round; | |
311 | ||
312 | /* Advance state pointers and move on. */ | |
313 | this_round -= tmp_count; | |
314 | p = HEADER_SIZE; | |
315 | con_buf0 = con_buf + HEADER_SIZE; | |
316 | /* If this_round >= 0, then p is even... */ | |
317 | } else if (p & 1) { | |
318 | /* Skip first byte for output if start address is odd | |
319 | * Update region sizes up/down depending on free | |
320 | * space in buffer. | |
321 | */ | |
322 | con_buf_start++; | |
323 | if (this_round < CON_BUF_SIZE) | |
324 | this_round++; | |
325 | else | |
326 | orig_count--; | |
327 | } | |
328 | if (this_round > 0) { | |
329 | unsigned short *tmp_buf = (unsigned short *)con_buf0; | |
330 | ||
331 | p -= HEADER_SIZE; | |
332 | p /= 2; | |
333 | col = p % maxcol; | |
334 | ||
335 | org = screen_pos(vc, p, viewed); | |
336 | p += maxcol - col; | |
337 | ||
338 | /* Buffer has even length, so we can always copy | |
339 | * character + attribute. We do not copy last byte | |
340 | * to userspace if this_round is odd. | |
341 | */ | |
342 | this_round = (this_round + 1) >> 1; | |
343 | ||
344 | while (this_round) { | |
345 | *tmp_buf++ = vcs_scr_readw(vc, org++); | |
346 | this_round --; | |
347 | if (++col == maxcol) { | |
348 | org = screen_pos(vc, p, viewed); | |
349 | col = 0; | |
350 | p += maxcol; | |
351 | } | |
352 | } | |
353 | } | |
354 | } | |
355 | ||
356 | /* Finally, release the console semaphore while we push | |
357 | * all the data to userspace from our temporary buffer. | |
358 | * | |
359 | * AKPM: Even though it's a semaphore, we should drop it because | |
360 | * the pagefault handling code may want to call printk(). | |
361 | */ | |
362 | ||
ac751efa | 363 | console_unlock(); |
1da177e4 | 364 | ret = copy_to_user(buf, con_buf_start, orig_count); |
ac751efa | 365 | console_lock(); |
1da177e4 LT |
366 | |
367 | if (ret) { | |
368 | read += (orig_count - ret); | |
369 | ret = -EFAULT; | |
370 | break; | |
371 | } | |
372 | buf += orig_count; | |
373 | pos += orig_count; | |
374 | read += orig_count; | |
375 | count -= orig_count; | |
376 | } | |
377 | *ppos += read; | |
378 | if (read) | |
379 | ret = read; | |
380 | unlock_out: | |
ac751efa | 381 | console_unlock(); |
fcdba07e | 382 | free_page((unsigned long) con_buf); |
1da177e4 LT |
383 | return ret; |
384 | } | |
385 | ||
386 | static ssize_t | |
387 | vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
388 | { | |
496ad9aa | 389 | struct inode *inode = file_inode(file); |
1da177e4 LT |
390 | unsigned int currcons = iminor(inode); |
391 | struct vc_data *vc; | |
392 | long pos; | |
fcdba07e | 393 | long attr, size, written; |
1da177e4 | 394 | char *con_buf0; |
fcdba07e | 395 | int col, maxcol, viewed; |
1da177e4 LT |
396 | u16 *org0 = NULL, *org = NULL; |
397 | size_t ret; | |
fcdba07e | 398 | char *con_buf; |
1da177e4 | 399 | |
fcdba07e JO |
400 | con_buf = (char *) __get_free_page(GFP_KERNEL); |
401 | if (!con_buf) | |
402 | return -ENOMEM; | |
1da177e4 LT |
403 | |
404 | pos = *ppos; | |
405 | ||
406 | /* Select the proper current console and verify | |
407 | * sanity of the situation under the console lock. | |
408 | */ | |
ac751efa | 409 | console_lock(); |
1da177e4 LT |
410 | |
411 | attr = (currcons & 128); | |
1da177e4 | 412 | ret = -ENXIO; |
fcdba07e JO |
413 | vc = vcs_vc(inode, &viewed); |
414 | if (!vc) | |
1da177e4 | 415 | goto unlock_out; |
1da177e4 LT |
416 | |
417 | size = vcs_size(inode); | |
418 | ret = -EINVAL; | |
419 | if (pos < 0 || pos > size) | |
420 | goto unlock_out; | |
421 | if (count > size - pos) | |
422 | count = size - pos; | |
423 | written = 0; | |
424 | while (count) { | |
425 | long this_round = count; | |
426 | size_t orig_count; | |
427 | long p; | |
428 | ||
429 | if (this_round > CON_BUF_SIZE) | |
430 | this_round = CON_BUF_SIZE; | |
431 | ||
432 | /* Temporarily drop the console lock so that we can read | |
433 | * in the write data from userspace safely. | |
434 | */ | |
ac751efa | 435 | console_unlock(); |
1da177e4 | 436 | ret = copy_from_user(con_buf, buf, this_round); |
ac751efa | 437 | console_lock(); |
1da177e4 LT |
438 | |
439 | if (ret) { | |
440 | this_round -= ret; | |
441 | if (!this_round) { | |
442 | /* Abort loop if no data were copied. Otherwise | |
443 | * fail with -EFAULT. | |
444 | */ | |
445 | if (written) | |
446 | break; | |
447 | ret = -EFAULT; | |
448 | goto unlock_out; | |
449 | } | |
450 | } | |
451 | ||
452 | /* The vcs_size might have changed while we slept to grab | |
453 | * the user buffer, so recheck. | |
454 | * Return data written up to now on failure. | |
455 | */ | |
456 | size = vcs_size(inode); | |
dc1892c4 JO |
457 | if (size < 0) { |
458 | if (written) | |
459 | break; | |
460 | ret = size; | |
461 | goto unlock_out; | |
462 | } | |
1da177e4 LT |
463 | if (pos >= size) |
464 | break; | |
465 | if (this_round > size - pos) | |
466 | this_round = size - pos; | |
467 | ||
468 | /* OK, now actually push the write to the console | |
469 | * under the lock using the local kernel buffer. | |
470 | */ | |
471 | ||
472 | con_buf0 = con_buf; | |
473 | orig_count = this_round; | |
474 | maxcol = vc->vc_cols; | |
475 | p = pos; | |
476 | if (!attr) { | |
477 | org0 = org = screen_pos(vc, p, viewed); | |
478 | col = p % maxcol; | |
479 | p += maxcol - col; | |
480 | ||
481 | while (this_round > 0) { | |
482 | unsigned char c = *con_buf0++; | |
483 | ||
484 | this_round--; | |
485 | vcs_scr_writew(vc, | |
486 | (vcs_scr_readw(vc, org) & 0xff00) | c, org); | |
487 | org++; | |
488 | if (++col == maxcol) { | |
489 | org = screen_pos(vc, p, viewed); | |
490 | col = 0; | |
491 | p += maxcol; | |
492 | } | |
493 | } | |
494 | } else { | |
495 | if (p < HEADER_SIZE) { | |
496 | char header[HEADER_SIZE]; | |
497 | ||
498 | getconsxy(vc, header + 2); | |
499 | while (p < HEADER_SIZE && this_round > 0) { | |
500 | this_round--; | |
501 | header[p++] = *con_buf0++; | |
502 | } | |
503 | if (!viewed) | |
504 | putconsxy(vc, header + 2); | |
505 | } | |
506 | p -= HEADER_SIZE; | |
507 | col = (p/2) % maxcol; | |
508 | if (this_round > 0) { | |
509 | org0 = org = screen_pos(vc, p/2, viewed); | |
510 | if ((p & 1) && this_round > 0) { | |
511 | char c; | |
512 | ||
513 | this_round--; | |
514 | c = *con_buf0++; | |
515 | #ifdef __BIG_ENDIAN | |
516 | vcs_scr_writew(vc, c | | |
517 | (vcs_scr_readw(vc, org) & 0xff00), org); | |
518 | #else | |
519 | vcs_scr_writew(vc, (c << 8) | | |
520 | (vcs_scr_readw(vc, org) & 0xff), org); | |
521 | #endif | |
522 | org++; | |
523 | p++; | |
524 | if (++col == maxcol) { | |
525 | org = screen_pos(vc, p/2, viewed); | |
526 | col = 0; | |
527 | } | |
528 | } | |
529 | p /= 2; | |
530 | p += maxcol - col; | |
531 | } | |
532 | while (this_round > 1) { | |
533 | unsigned short w; | |
534 | ||
ee025949 | 535 | w = get_unaligned(((unsigned short *)con_buf0)); |
1da177e4 LT |
536 | vcs_scr_writew(vc, w, org++); |
537 | con_buf0 += 2; | |
538 | this_round -= 2; | |
539 | if (++col == maxcol) { | |
540 | org = screen_pos(vc, p, viewed); | |
541 | col = 0; | |
542 | p += maxcol; | |
543 | } | |
544 | } | |
545 | if (this_round > 0) { | |
546 | unsigned char c; | |
547 | ||
548 | c = *con_buf0++; | |
549 | #ifdef __BIG_ENDIAN | |
550 | vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff) | (c << 8), org); | |
551 | #else | |
552 | vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff00) | c, org); | |
553 | #endif | |
554 | } | |
555 | } | |
556 | count -= orig_count; | |
557 | written += orig_count; | |
558 | buf += orig_count; | |
559 | pos += orig_count; | |
560 | if (org0) | |
561 | update_region(vc, (unsigned long)(org0), org - org0); | |
562 | } | |
563 | *ppos += written; | |
564 | ret = written; | |
432c9ed2 NP |
565 | if (written) |
566 | vcs_scr_updated(vc); | |
1da177e4 LT |
567 | |
568 | unlock_out: | |
ac751efa | 569 | console_unlock(); |
fcdba07e | 570 | free_page((unsigned long) con_buf); |
1da177e4 LT |
571 | return ret; |
572 | } | |
573 | ||
47725ac7 NP |
574 | static unsigned int |
575 | vcs_poll(struct file *file, poll_table *wait) | |
576 | { | |
577 | struct vcs_poll_data *poll = vcs_poll_data_get(file); | |
47c344d0 | 578 | int ret = DEFAULT_POLLMASK|POLLERR|POLLPRI; |
47725ac7 NP |
579 | |
580 | if (poll) { | |
581 | poll_wait(file, &poll->waitq, wait); | |
47c344d0 NP |
582 | if (poll->seen_last_update) |
583 | ret = DEFAULT_POLLMASK; | |
47725ac7 NP |
584 | } |
585 | return ret; | |
586 | } | |
587 | ||
588 | static int | |
589 | vcs_fasync(int fd, struct file *file, int on) | |
590 | { | |
591 | struct vcs_poll_data *poll = file->private_data; | |
592 | ||
593 | if (!poll) { | |
594 | /* don't allocate anything if all we want is disable fasync */ | |
595 | if (!on) | |
596 | return 0; | |
597 | poll = vcs_poll_data_get(file); | |
598 | if (!poll) | |
599 | return -ENOMEM; | |
600 | } | |
601 | ||
602 | return fasync_helper(fd, file, on, &poll->fasync); | |
603 | } | |
604 | ||
1da177e4 LT |
605 | static int |
606 | vcs_open(struct inode *inode, struct file *filp) | |
607 | { | |
608 | unsigned int currcons = iminor(inode) & 127; | |
f97259e3 JC |
609 | int ret = 0; |
610 | ||
4001d7b7 | 611 | console_lock(); |
1da177e4 | 612 | if(currcons && !vc_cons_allocated(currcons-1)) |
f97259e3 | 613 | ret = -ENXIO; |
4001d7b7 | 614 | console_unlock(); |
f97259e3 | 615 | return ret; |
1da177e4 LT |
616 | } |
617 | ||
47725ac7 NP |
618 | static int vcs_release(struct inode *inode, struct file *file) |
619 | { | |
620 | struct vcs_poll_data *poll = file->private_data; | |
621 | ||
622 | if (poll) | |
623 | vcs_poll_data_free(poll); | |
624 | return 0; | |
625 | } | |
626 | ||
62322d25 | 627 | static const struct file_operations vcs_fops = { |
1da177e4 LT |
628 | .llseek = vcs_lseek, |
629 | .read = vcs_read, | |
630 | .write = vcs_write, | |
47725ac7 NP |
631 | .poll = vcs_poll, |
632 | .fasync = vcs_fasync, | |
1da177e4 | 633 | .open = vcs_open, |
47725ac7 | 634 | .release = vcs_release, |
1da177e4 LT |
635 | }; |
636 | ||
ca8eca68 | 637 | static struct class *vc_class; |
1da177e4 | 638 | |
4995f8ef | 639 | void vcs_make_sysfs(int index) |
1da177e4 | 640 | { |
4995f8ef KS |
641 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL, |
642 | "vcs%u", index + 1); | |
643 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL, | |
644 | "vcsa%u", index + 1); | |
1da177e4 | 645 | } |
d09d7ddf | 646 | |
4995f8ef | 647 | void vcs_remove_sysfs(int index) |
1da177e4 | 648 | { |
4995f8ef KS |
649 | device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 1)); |
650 | device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 129)); | |
1da177e4 LT |
651 | } |
652 | ||
653 | int __init vcs_init(void) | |
654 | { | |
c46a7aec KS |
655 | unsigned int i; |
656 | ||
1da177e4 LT |
657 | if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops)) |
658 | panic("unable to get major %d for vcs device", VCS_MAJOR); | |
ca8eca68 | 659 | vc_class = class_create(THIS_MODULE, "vc"); |
1da177e4 | 660 | |
03457cd4 GKH |
661 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs"); |
662 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa"); | |
c46a7aec KS |
663 | for (i = 0; i < MIN_NR_CONSOLES; i++) |
664 | vcs_make_sysfs(i); | |
1da177e4 LT |
665 | return 0; |
666 | } |