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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Provide access to virtual console memory. |
4 | * /dev/vcs0: the screen as it is being viewed right now (possibly scrolled) | |
5 | * /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63) | |
6 | * [minor: N] | |
7 | * | |
8 | * /dev/vcsaN: idem, but including attributes, and prefixed with | |
9 | * the 4 bytes lines,columns,x,y (as screendump used to give). | |
10 | * Attribute/character pair is in native endianity. | |
11 | * [minor: N+128] | |
12 | * | |
13 | * This replaces screendump and part of selection, so that the system | |
14 | * administrator can control access using file system permissions. | |
15 | * | |
16 | * aeb@cwi.nl - efter Friedas begravelse - 950211 | |
17 | * | |
18 | * machek@k332.feld.cvut.cz - modified not to send characters to wrong console | |
19 | * - fixed some fatal off-by-one bugs (0-- no longer == -1 -> looping and looping and looping...) | |
20 | * - making it shorter - scr_readw are macros which expand in PRETTY long code | |
21 | */ | |
22 | ||
1da177e4 LT |
23 | #include <linux/kernel.h> |
24 | #include <linux/major.h> | |
25 | #include <linux/errno.h> | |
0e648f42 | 26 | #include <linux/export.h> |
1da177e4 | 27 | #include <linux/tty.h> |
1da177e4 LT |
28 | #include <linux/interrupt.h> |
29 | #include <linux/mm.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/vt_kern.h> | |
32 | #include <linux/selection.h> | |
33 | #include <linux/kbd_kern.h> | |
34 | #include <linux/console.h> | |
1da177e4 | 35 | #include <linux/device.h> |
47725ac7 NP |
36 | #include <linux/sched.h> |
37 | #include <linux/fs.h> | |
38 | #include <linux/poll.h> | |
39 | #include <linux/signal.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/notifier.h> | |
c831c338 | 42 | |
7c0f6ba6 | 43 | #include <linux/uaccess.h> |
1da177e4 LT |
44 | #include <asm/byteorder.h> |
45 | #include <asm/unaligned.h> | |
46 | ||
47 | #undef attr | |
48 | #undef org | |
49 | #undef addr | |
50 | #define HEADER_SIZE 4 | |
51 | ||
fcdba07e JO |
52 | #define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE) |
53 | ||
47725ac7 NP |
54 | struct vcs_poll_data { |
55 | struct notifier_block notifier; | |
56 | unsigned int cons_num; | |
57 | bool seen_last_update; | |
58 | wait_queue_head_t waitq; | |
59 | struct fasync_struct *fasync; | |
60 | }; | |
61 | ||
62 | static int | |
63 | vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param) | |
64 | { | |
65 | struct vt_notifier_param *param = _param; | |
66 | struct vc_data *vc = param->vc; | |
67 | struct vcs_poll_data *poll = | |
68 | container_of(nb, struct vcs_poll_data, notifier); | |
69 | int currcons = poll->cons_num; | |
70 | ||
71 | if (code != VT_UPDATE) | |
72 | return NOTIFY_DONE; | |
73 | ||
74 | if (currcons == 0) | |
75 | currcons = fg_console; | |
76 | else | |
77 | currcons--; | |
78 | if (currcons != vc->vc_num) | |
79 | return NOTIFY_DONE; | |
80 | ||
81 | poll->seen_last_update = false; | |
82 | wake_up_interruptible(&poll->waitq); | |
83 | kill_fasync(&poll->fasync, SIGIO, POLL_IN); | |
84 | return NOTIFY_OK; | |
85 | } | |
86 | ||
87 | static void | |
88 | vcs_poll_data_free(struct vcs_poll_data *poll) | |
89 | { | |
90 | unregister_vt_notifier(&poll->notifier); | |
91 | kfree(poll); | |
92 | } | |
93 | ||
94 | static struct vcs_poll_data * | |
95 | vcs_poll_data_get(struct file *file) | |
96 | { | |
e8cd8169 | 97 | struct vcs_poll_data *poll = file->private_data, *kill = NULL; |
47725ac7 NP |
98 | |
99 | if (poll) | |
100 | return poll; | |
101 | ||
102 | poll = kzalloc(sizeof(*poll), GFP_KERNEL); | |
103 | if (!poll) | |
104 | return NULL; | |
496ad9aa | 105 | poll->cons_num = iminor(file_inode(file)) & 127; |
47725ac7 NP |
106 | init_waitqueue_head(&poll->waitq); |
107 | poll->notifier.notifier_call = vcs_notifier; | |
108 | if (register_vt_notifier(&poll->notifier) != 0) { | |
109 | kfree(poll); | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | /* | |
114 | * This code may be called either through ->poll() or ->fasync(). | |
115 | * If we have two threads using the same file descriptor, they could | |
116 | * both enter this function, both notice that the structure hasn't | |
117 | * been allocated yet and go ahead allocating it in parallel, but | |
118 | * only one of them must survive and be shared otherwise we'd leak | |
119 | * memory with a dangling notifier callback. | |
120 | */ | |
121 | spin_lock(&file->f_lock); | |
122 | if (!file->private_data) { | |
123 | file->private_data = poll; | |
124 | } else { | |
125 | /* someone else raced ahead of us */ | |
e8cd8169 | 126 | kill = poll; |
47725ac7 NP |
127 | poll = file->private_data; |
128 | } | |
129 | spin_unlock(&file->f_lock); | |
e8cd8169 AV |
130 | if (kill) |
131 | vcs_poll_data_free(kill); | |
47725ac7 NP |
132 | |
133 | return poll; | |
134 | } | |
135 | ||
fcdba07e JO |
136 | /* |
137 | * Returns VC for inode. | |
138 | * Must be called with console_lock. | |
139 | */ | |
140 | static struct vc_data* | |
141 | vcs_vc(struct inode *inode, int *viewed) | |
142 | { | |
143 | unsigned int currcons = iminor(inode) & 127; | |
144 | ||
145 | WARN_CONSOLE_UNLOCKED(); | |
146 | ||
147 | if (currcons == 0) { | |
148 | currcons = fg_console; | |
149 | if (viewed) | |
150 | *viewed = 1; | |
151 | } else { | |
152 | currcons--; | |
153 | if (viewed) | |
154 | *viewed = 0; | |
155 | } | |
156 | return vc_cons[currcons].d; | |
157 | } | |
158 | ||
159 | /* | |
160 | * Returns size for VC carried by inode. | |
161 | * Must be called with console_lock. | |
162 | */ | |
1da177e4 LT |
163 | static int |
164 | vcs_size(struct inode *inode) | |
165 | { | |
166 | int size; | |
167 | int minor = iminor(inode); | |
1da177e4 LT |
168 | struct vc_data *vc; |
169 | ||
fcdba07e JO |
170 | WARN_CONSOLE_UNLOCKED(); |
171 | ||
172 | vc = vcs_vc(inode, NULL); | |
173 | if (!vc) | |
1da177e4 | 174 | return -ENXIO; |
1da177e4 LT |
175 | |
176 | size = vc->vc_rows * vc->vc_cols; | |
177 | ||
178 | if (minor & 128) | |
179 | size = 2*size + HEADER_SIZE; | |
180 | return size; | |
181 | } | |
182 | ||
183 | static loff_t vcs_lseek(struct file *file, loff_t offset, int orig) | |
184 | { | |
185 | int size; | |
186 | ||
dc1892c4 | 187 | console_lock(); |
496ad9aa | 188 | size = vcs_size(file_inode(file)); |
dc1892c4 | 189 | console_unlock(); |
fcdba07e | 190 | if (size < 0) |
dc1892c4 | 191 | return size; |
65004276 | 192 | return fixed_size_llseek(file, offset, orig, size); |
1da177e4 LT |
193 | } |
194 | ||
195 | ||
196 | static ssize_t | |
197 | vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
198 | { | |
496ad9aa | 199 | struct inode *inode = file_inode(file); |
1da177e4 LT |
200 | unsigned int currcons = iminor(inode); |
201 | struct vc_data *vc; | |
47725ac7 | 202 | struct vcs_poll_data *poll; |
1da177e4 | 203 | long pos; |
fcdba07e JO |
204 | long attr, read; |
205 | int col, maxcol, viewed; | |
1da177e4 LT |
206 | unsigned short *org = NULL; |
207 | ssize_t ret; | |
fcdba07e | 208 | char *con_buf; |
1da177e4 | 209 | |
fcdba07e JO |
210 | con_buf = (char *) __get_free_page(GFP_KERNEL); |
211 | if (!con_buf) | |
212 | return -ENOMEM; | |
1da177e4 LT |
213 | |
214 | pos = *ppos; | |
215 | ||
216 | /* Select the proper current console and verify | |
217 | * sanity of the situation under the console lock. | |
218 | */ | |
ac751efa | 219 | console_lock(); |
1da177e4 LT |
220 | |
221 | attr = (currcons & 128); | |
1da177e4 | 222 | ret = -ENXIO; |
fcdba07e JO |
223 | vc = vcs_vc(inode, &viewed); |
224 | if (!vc) | |
1da177e4 | 225 | goto unlock_out; |
1da177e4 LT |
226 | |
227 | ret = -EINVAL; | |
228 | if (pos < 0) | |
229 | goto unlock_out; | |
47725ac7 NP |
230 | poll = file->private_data; |
231 | if (count && poll) | |
232 | poll->seen_last_update = true; | |
1da177e4 LT |
233 | read = 0; |
234 | ret = 0; | |
235 | while (count) { | |
236 | char *con_buf0, *con_buf_start; | |
237 | long this_round, size; | |
238 | ssize_t orig_count; | |
239 | long p = pos; | |
240 | ||
241 | /* Check whether we are above size each round, | |
242 | * as copy_to_user at the end of this loop | |
243 | * could sleep. | |
244 | */ | |
245 | size = vcs_size(inode); | |
dc1892c4 JO |
246 | if (size < 0) { |
247 | if (read) | |
248 | break; | |
249 | ret = size; | |
250 | goto unlock_out; | |
251 | } | |
1da177e4 LT |
252 | if (pos >= size) |
253 | break; | |
254 | if (count > size - pos) | |
255 | count = size - pos; | |
256 | ||
257 | this_round = count; | |
258 | if (this_round > CON_BUF_SIZE) | |
259 | this_round = CON_BUF_SIZE; | |
260 | ||
261 | /* Perform the whole read into the local con_buf. | |
262 | * Then we can drop the console spinlock and safely | |
263 | * attempt to move it to userspace. | |
264 | */ | |
265 | ||
266 | con_buf_start = con_buf0 = con_buf; | |
267 | orig_count = this_round; | |
268 | maxcol = vc->vc_cols; | |
269 | if (!attr) { | |
270 | org = screen_pos(vc, p, viewed); | |
271 | col = p % maxcol; | |
272 | p += maxcol - col; | |
273 | while (this_round-- > 0) { | |
274 | *con_buf0++ = (vcs_scr_readw(vc, org++) & 0xff); | |
275 | if (++col == maxcol) { | |
276 | org = screen_pos(vc, p, viewed); | |
277 | col = 0; | |
278 | p += maxcol; | |
279 | } | |
280 | } | |
281 | } else { | |
282 | if (p < HEADER_SIZE) { | |
283 | size_t tmp_count; | |
284 | ||
285 | con_buf0[0] = (char)vc->vc_rows; | |
286 | con_buf0[1] = (char)vc->vc_cols; | |
287 | getconsxy(vc, con_buf0 + 2); | |
288 | ||
289 | con_buf_start += p; | |
290 | this_round += p; | |
291 | if (this_round > CON_BUF_SIZE) { | |
292 | this_round = CON_BUF_SIZE; | |
293 | orig_count = this_round - p; | |
294 | } | |
295 | ||
296 | tmp_count = HEADER_SIZE; | |
297 | if (tmp_count > this_round) | |
298 | tmp_count = this_round; | |
299 | ||
300 | /* Advance state pointers and move on. */ | |
301 | this_round -= tmp_count; | |
302 | p = HEADER_SIZE; | |
303 | con_buf0 = con_buf + HEADER_SIZE; | |
304 | /* If this_round >= 0, then p is even... */ | |
305 | } else if (p & 1) { | |
306 | /* Skip first byte for output if start address is odd | |
307 | * Update region sizes up/down depending on free | |
308 | * space in buffer. | |
309 | */ | |
310 | con_buf_start++; | |
311 | if (this_round < CON_BUF_SIZE) | |
312 | this_round++; | |
313 | else | |
314 | orig_count--; | |
315 | } | |
316 | if (this_round > 0) { | |
317 | unsigned short *tmp_buf = (unsigned short *)con_buf0; | |
318 | ||
319 | p -= HEADER_SIZE; | |
320 | p /= 2; | |
321 | col = p % maxcol; | |
322 | ||
323 | org = screen_pos(vc, p, viewed); | |
324 | p += maxcol - col; | |
325 | ||
326 | /* Buffer has even length, so we can always copy | |
327 | * character + attribute. We do not copy last byte | |
328 | * to userspace if this_round is odd. | |
329 | */ | |
330 | this_round = (this_round + 1) >> 1; | |
331 | ||
332 | while (this_round) { | |
333 | *tmp_buf++ = vcs_scr_readw(vc, org++); | |
334 | this_round --; | |
335 | if (++col == maxcol) { | |
336 | org = screen_pos(vc, p, viewed); | |
337 | col = 0; | |
338 | p += maxcol; | |
339 | } | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | /* Finally, release the console semaphore while we push | |
345 | * all the data to userspace from our temporary buffer. | |
346 | * | |
347 | * AKPM: Even though it's a semaphore, we should drop it because | |
348 | * the pagefault handling code may want to call printk(). | |
349 | */ | |
350 | ||
ac751efa | 351 | console_unlock(); |
1da177e4 | 352 | ret = copy_to_user(buf, con_buf_start, orig_count); |
ac751efa | 353 | console_lock(); |
1da177e4 LT |
354 | |
355 | if (ret) { | |
356 | read += (orig_count - ret); | |
357 | ret = -EFAULT; | |
358 | break; | |
359 | } | |
360 | buf += orig_count; | |
361 | pos += orig_count; | |
362 | read += orig_count; | |
363 | count -= orig_count; | |
364 | } | |
365 | *ppos += read; | |
366 | if (read) | |
367 | ret = read; | |
368 | unlock_out: | |
ac751efa | 369 | console_unlock(); |
fcdba07e | 370 | free_page((unsigned long) con_buf); |
1da177e4 LT |
371 | return ret; |
372 | } | |
373 | ||
374 | static ssize_t | |
375 | vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
376 | { | |
496ad9aa | 377 | struct inode *inode = file_inode(file); |
1da177e4 LT |
378 | unsigned int currcons = iminor(inode); |
379 | struct vc_data *vc; | |
380 | long pos; | |
fcdba07e | 381 | long attr, size, written; |
1da177e4 | 382 | char *con_buf0; |
fcdba07e | 383 | int col, maxcol, viewed; |
1da177e4 LT |
384 | u16 *org0 = NULL, *org = NULL; |
385 | size_t ret; | |
fcdba07e | 386 | char *con_buf; |
1da177e4 | 387 | |
fcdba07e JO |
388 | con_buf = (char *) __get_free_page(GFP_KERNEL); |
389 | if (!con_buf) | |
390 | return -ENOMEM; | |
1da177e4 LT |
391 | |
392 | pos = *ppos; | |
393 | ||
394 | /* Select the proper current console and verify | |
395 | * sanity of the situation under the console lock. | |
396 | */ | |
ac751efa | 397 | console_lock(); |
1da177e4 LT |
398 | |
399 | attr = (currcons & 128); | |
1da177e4 | 400 | ret = -ENXIO; |
fcdba07e JO |
401 | vc = vcs_vc(inode, &viewed); |
402 | if (!vc) | |
1da177e4 | 403 | goto unlock_out; |
1da177e4 LT |
404 | |
405 | size = vcs_size(inode); | |
406 | ret = -EINVAL; | |
407 | if (pos < 0 || pos > size) | |
408 | goto unlock_out; | |
409 | if (count > size - pos) | |
410 | count = size - pos; | |
411 | written = 0; | |
412 | while (count) { | |
413 | long this_round = count; | |
414 | size_t orig_count; | |
415 | long p; | |
416 | ||
417 | if (this_round > CON_BUF_SIZE) | |
418 | this_round = CON_BUF_SIZE; | |
419 | ||
420 | /* Temporarily drop the console lock so that we can read | |
421 | * in the write data from userspace safely. | |
422 | */ | |
ac751efa | 423 | console_unlock(); |
1da177e4 | 424 | ret = copy_from_user(con_buf, buf, this_round); |
ac751efa | 425 | console_lock(); |
1da177e4 LT |
426 | |
427 | if (ret) { | |
428 | this_round -= ret; | |
429 | if (!this_round) { | |
430 | /* Abort loop if no data were copied. Otherwise | |
431 | * fail with -EFAULT. | |
432 | */ | |
433 | if (written) | |
434 | break; | |
435 | ret = -EFAULT; | |
436 | goto unlock_out; | |
437 | } | |
438 | } | |
439 | ||
440 | /* The vcs_size might have changed while we slept to grab | |
441 | * the user buffer, so recheck. | |
442 | * Return data written up to now on failure. | |
443 | */ | |
444 | size = vcs_size(inode); | |
dc1892c4 JO |
445 | if (size < 0) { |
446 | if (written) | |
447 | break; | |
448 | ret = size; | |
449 | goto unlock_out; | |
450 | } | |
1da177e4 LT |
451 | if (pos >= size) |
452 | break; | |
453 | if (this_round > size - pos) | |
454 | this_round = size - pos; | |
455 | ||
456 | /* OK, now actually push the write to the console | |
457 | * under the lock using the local kernel buffer. | |
458 | */ | |
459 | ||
460 | con_buf0 = con_buf; | |
461 | orig_count = this_round; | |
462 | maxcol = vc->vc_cols; | |
463 | p = pos; | |
464 | if (!attr) { | |
465 | org0 = org = screen_pos(vc, p, viewed); | |
466 | col = p % maxcol; | |
467 | p += maxcol - col; | |
468 | ||
469 | while (this_round > 0) { | |
470 | unsigned char c = *con_buf0++; | |
471 | ||
472 | this_round--; | |
473 | vcs_scr_writew(vc, | |
474 | (vcs_scr_readw(vc, org) & 0xff00) | c, org); | |
475 | org++; | |
476 | if (++col == maxcol) { | |
477 | org = screen_pos(vc, p, viewed); | |
478 | col = 0; | |
479 | p += maxcol; | |
480 | } | |
481 | } | |
482 | } else { | |
483 | if (p < HEADER_SIZE) { | |
484 | char header[HEADER_SIZE]; | |
485 | ||
486 | getconsxy(vc, header + 2); | |
487 | while (p < HEADER_SIZE && this_round > 0) { | |
488 | this_round--; | |
489 | header[p++] = *con_buf0++; | |
490 | } | |
491 | if (!viewed) | |
492 | putconsxy(vc, header + 2); | |
493 | } | |
494 | p -= HEADER_SIZE; | |
495 | col = (p/2) % maxcol; | |
496 | if (this_round > 0) { | |
497 | org0 = org = screen_pos(vc, p/2, viewed); | |
498 | if ((p & 1) && this_round > 0) { | |
499 | char c; | |
500 | ||
501 | this_round--; | |
502 | c = *con_buf0++; | |
503 | #ifdef __BIG_ENDIAN | |
504 | vcs_scr_writew(vc, c | | |
505 | (vcs_scr_readw(vc, org) & 0xff00), org); | |
506 | #else | |
507 | vcs_scr_writew(vc, (c << 8) | | |
508 | (vcs_scr_readw(vc, org) & 0xff), org); | |
509 | #endif | |
510 | org++; | |
511 | p++; | |
512 | if (++col == maxcol) { | |
513 | org = screen_pos(vc, p/2, viewed); | |
514 | col = 0; | |
515 | } | |
516 | } | |
517 | p /= 2; | |
518 | p += maxcol - col; | |
519 | } | |
520 | while (this_round > 1) { | |
521 | unsigned short w; | |
522 | ||
ee025949 | 523 | w = get_unaligned(((unsigned short *)con_buf0)); |
1da177e4 LT |
524 | vcs_scr_writew(vc, w, org++); |
525 | con_buf0 += 2; | |
526 | this_round -= 2; | |
527 | if (++col == maxcol) { | |
528 | org = screen_pos(vc, p, viewed); | |
529 | col = 0; | |
530 | p += maxcol; | |
531 | } | |
532 | } | |
533 | if (this_round > 0) { | |
534 | unsigned char c; | |
535 | ||
536 | c = *con_buf0++; | |
537 | #ifdef __BIG_ENDIAN | |
538 | vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff) | (c << 8), org); | |
539 | #else | |
540 | vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff00) | c, org); | |
541 | #endif | |
542 | } | |
543 | } | |
544 | count -= orig_count; | |
545 | written += orig_count; | |
546 | buf += orig_count; | |
547 | pos += orig_count; | |
548 | if (org0) | |
549 | update_region(vc, (unsigned long)(org0), org - org0); | |
550 | } | |
551 | *ppos += written; | |
552 | ret = written; | |
432c9ed2 NP |
553 | if (written) |
554 | vcs_scr_updated(vc); | |
1da177e4 LT |
555 | |
556 | unlock_out: | |
ac751efa | 557 | console_unlock(); |
fcdba07e | 558 | free_page((unsigned long) con_buf); |
1da177e4 LT |
559 | return ret; |
560 | } | |
561 | ||
47725ac7 NP |
562 | static unsigned int |
563 | vcs_poll(struct file *file, poll_table *wait) | |
564 | { | |
565 | struct vcs_poll_data *poll = vcs_poll_data_get(file); | |
47c344d0 | 566 | int ret = DEFAULT_POLLMASK|POLLERR|POLLPRI; |
47725ac7 NP |
567 | |
568 | if (poll) { | |
569 | poll_wait(file, &poll->waitq, wait); | |
47c344d0 NP |
570 | if (poll->seen_last_update) |
571 | ret = DEFAULT_POLLMASK; | |
47725ac7 NP |
572 | } |
573 | return ret; | |
574 | } | |
575 | ||
576 | static int | |
577 | vcs_fasync(int fd, struct file *file, int on) | |
578 | { | |
579 | struct vcs_poll_data *poll = file->private_data; | |
580 | ||
581 | if (!poll) { | |
582 | /* don't allocate anything if all we want is disable fasync */ | |
583 | if (!on) | |
584 | return 0; | |
585 | poll = vcs_poll_data_get(file); | |
586 | if (!poll) | |
587 | return -ENOMEM; | |
588 | } | |
589 | ||
590 | return fasync_helper(fd, file, on, &poll->fasync); | |
591 | } | |
592 | ||
1da177e4 LT |
593 | static int |
594 | vcs_open(struct inode *inode, struct file *filp) | |
595 | { | |
596 | unsigned int currcons = iminor(inode) & 127; | |
f97259e3 JC |
597 | int ret = 0; |
598 | ||
4001d7b7 | 599 | console_lock(); |
1da177e4 | 600 | if(currcons && !vc_cons_allocated(currcons-1)) |
f97259e3 | 601 | ret = -ENXIO; |
4001d7b7 | 602 | console_unlock(); |
f97259e3 | 603 | return ret; |
1da177e4 LT |
604 | } |
605 | ||
47725ac7 NP |
606 | static int vcs_release(struct inode *inode, struct file *file) |
607 | { | |
608 | struct vcs_poll_data *poll = file->private_data; | |
609 | ||
610 | if (poll) | |
611 | vcs_poll_data_free(poll); | |
612 | return 0; | |
613 | } | |
614 | ||
62322d25 | 615 | static const struct file_operations vcs_fops = { |
1da177e4 LT |
616 | .llseek = vcs_lseek, |
617 | .read = vcs_read, | |
618 | .write = vcs_write, | |
47725ac7 NP |
619 | .poll = vcs_poll, |
620 | .fasync = vcs_fasync, | |
1da177e4 | 621 | .open = vcs_open, |
47725ac7 | 622 | .release = vcs_release, |
1da177e4 LT |
623 | }; |
624 | ||
ca8eca68 | 625 | static struct class *vc_class; |
1da177e4 | 626 | |
4995f8ef | 627 | void vcs_make_sysfs(int index) |
1da177e4 | 628 | { |
4995f8ef KS |
629 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL, |
630 | "vcs%u", index + 1); | |
631 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL, | |
632 | "vcsa%u", index + 1); | |
1da177e4 | 633 | } |
d09d7ddf | 634 | |
4995f8ef | 635 | void vcs_remove_sysfs(int index) |
1da177e4 | 636 | { |
4995f8ef KS |
637 | device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 1)); |
638 | device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 129)); | |
1da177e4 LT |
639 | } |
640 | ||
641 | int __init vcs_init(void) | |
642 | { | |
c46a7aec KS |
643 | unsigned int i; |
644 | ||
1da177e4 LT |
645 | if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops)) |
646 | panic("unable to get major %d for vcs device", VCS_MAJOR); | |
ca8eca68 | 647 | vc_class = class_create(THIS_MODULE, "vc"); |
1da177e4 | 648 | |
03457cd4 GKH |
649 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs"); |
650 | device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa"); | |
c46a7aec KS |
651 | for (i = 0; i < MIN_NR_CONSOLES; i++) |
652 | vcs_make_sysfs(i); | |
1da177e4 LT |
653 | return 0; |
654 | } |