Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
4b214a0c | 2 | * IBM/3270 Driver - fullscreen driver. |
1da177e4 | 3 | * |
4b214a0c MS |
4 | * Author(s): |
5 | * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) | |
6 | * Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Copyright IBM Corp. 2003, 2009 | |
1da177e4 LT |
8 | */ |
9 | ||
1da177e4 LT |
10 | #include <linux/bootmem.h> |
11 | #include <linux/console.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/types.h> | |
764a4a8e | 16 | #include <linux/smp_lock.h> |
1da177e4 | 17 | |
16e1a577 | 18 | #include <asm/compat.h> |
1da177e4 LT |
19 | #include <asm/ccwdev.h> |
20 | #include <asm/cio.h> | |
1da177e4 LT |
21 | #include <asm/ebcdic.h> |
22 | #include <asm/idals.h> | |
23 | ||
24 | #include "raw3270.h" | |
25 | #include "ctrlchar.h" | |
26 | ||
2b67fc46 | 27 | static struct raw3270_fn fs3270_fn; |
1da177e4 LT |
28 | |
29 | struct fs3270 { | |
30 | struct raw3270_view view; | |
782237a2 | 31 | struct pid *fs_pid; /* Pid of controlling program. */ |
1da177e4 LT |
32 | int read_command; /* ccw command to use for reads. */ |
33 | int write_command; /* ccw command to use for writes. */ | |
34 | int attention; /* Got attention. */ | |
ed3cb6f0 RH |
35 | int active; /* Fullscreen view is active. */ |
36 | struct raw3270_request *init; /* single init request. */ | |
37 | wait_queue_head_t wait; /* Init & attention wait queue. */ | |
38 | struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */ | |
39 | size_t rdbuf_size; /* size of data returned by RDBUF */ | |
1da177e4 LT |
40 | }; |
41 | ||
5cbb5f57 MS |
42 | static DEFINE_MUTEX(fs3270_mutex); |
43 | ||
1da177e4 LT |
44 | static void |
45 | fs3270_wake_up(struct raw3270_request *rq, void *data) | |
46 | { | |
47 | wake_up((wait_queue_head_t *) data); | |
48 | } | |
49 | ||
ed3cb6f0 RH |
50 | static inline int |
51 | fs3270_working(struct fs3270 *fp) | |
52 | { | |
53 | /* | |
54 | * The fullscreen view is in working order if the view | |
55 | * has been activated AND the initial request is finished. | |
56 | */ | |
57 | return fp->active && raw3270_request_final(fp->init); | |
58 | } | |
59 | ||
1da177e4 LT |
60 | static int |
61 | fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq) | |
62 | { | |
ed3cb6f0 | 63 | struct fs3270 *fp; |
1da177e4 LT |
64 | int rc; |
65 | ||
ed3cb6f0 | 66 | fp = (struct fs3270 *) view; |
1da177e4 | 67 | rq->callback = fs3270_wake_up; |
ed3cb6f0 RH |
68 | rq->callback_data = &fp->wait; |
69 | ||
70 | do { | |
71 | if (!fs3270_working(fp)) { | |
72 | /* Fullscreen view isn't ready yet. */ | |
73 | rc = wait_event_interruptible(fp->wait, | |
74 | fs3270_working(fp)); | |
75 | if (rc != 0) | |
76 | break; | |
77 | } | |
78 | rc = raw3270_start(view, rq); | |
79 | if (rc == 0) { | |
af901ca1 | 80 | /* Started successfully. Now wait for completion. */ |
ed3cb6f0 RH |
81 | wait_event(fp->wait, raw3270_request_final(rq)); |
82 | } | |
83 | } while (rc == -EACCES); | |
84 | return rc; | |
1da177e4 LT |
85 | } |
86 | ||
ed3cb6f0 RH |
87 | /* |
88 | * Switch to the fullscreen view. | |
89 | */ | |
1da177e4 LT |
90 | static void |
91 | fs3270_reset_callback(struct raw3270_request *rq, void *data) | |
92 | { | |
ed3cb6f0 RH |
93 | struct fs3270 *fp; |
94 | ||
95 | fp = (struct fs3270 *) rq->view; | |
1da177e4 | 96 | raw3270_request_reset(rq); |
ed3cb6f0 RH |
97 | wake_up(&fp->wait); |
98 | } | |
99 | ||
100 | static void | |
101 | fs3270_restore_callback(struct raw3270_request *rq, void *data) | |
102 | { | |
103 | struct fs3270 *fp; | |
104 | ||
105 | fp = (struct fs3270 *) rq->view; | |
106 | if (rq->rc != 0 || rq->rescnt != 0) { | |
107 | if (fp->fs_pid) | |
782237a2 | 108 | kill_pid(fp->fs_pid, SIGHUP, 1); |
ed3cb6f0 RH |
109 | } |
110 | fp->rdbuf_size = 0; | |
111 | raw3270_request_reset(rq); | |
112 | wake_up(&fp->wait); | |
1da177e4 LT |
113 | } |
114 | ||
1da177e4 LT |
115 | static int |
116 | fs3270_activate(struct raw3270_view *view) | |
117 | { | |
118 | struct fs3270 *fp; | |
ed3cb6f0 RH |
119 | char *cp; |
120 | int rc; | |
1da177e4 LT |
121 | |
122 | fp = (struct fs3270 *) view; | |
ed3cb6f0 RH |
123 | |
124 | /* If an old init command is still running just return. */ | |
125 | if (!raw3270_request_final(fp->init)) | |
126 | return 0; | |
127 | ||
128 | if (fp->rdbuf_size == 0) { | |
129 | /* No saved buffer. Just clear the screen. */ | |
130 | raw3270_request_set_cmd(fp->init, TC_EWRITEA); | |
131 | fp->init->callback = fs3270_reset_callback; | |
132 | } else { | |
133 | /* Restore fullscreen buffer saved by fs3270_deactivate. */ | |
134 | raw3270_request_set_cmd(fp->init, TC_EWRITEA); | |
135 | raw3270_request_set_idal(fp->init, fp->rdbuf); | |
136 | fp->init->ccw.count = fp->rdbuf_size; | |
137 | cp = fp->rdbuf->data[0]; | |
138 | cp[0] = TW_KR; | |
139 | cp[1] = TO_SBA; | |
140 | cp[2] = cp[6]; | |
141 | cp[3] = cp[7]; | |
142 | cp[4] = TO_IC; | |
143 | cp[5] = TO_SBA; | |
144 | cp[6] = 0x40; | |
145 | cp[7] = 0x40; | |
146 | fp->init->rescnt = 0; | |
147 | fp->init->callback = fs3270_restore_callback; | |
148 | } | |
149 | rc = fp->init->rc = raw3270_start_locked(view, fp->init); | |
150 | if (rc) | |
151 | fp->init->callback(fp->init, NULL); | |
152 | else | |
153 | fp->active = 1; | |
154 | return rc; | |
1da177e4 LT |
155 | } |
156 | ||
157 | /* | |
158 | * Shutdown fullscreen view. | |
159 | */ | |
ed3cb6f0 RH |
160 | static void |
161 | fs3270_save_callback(struct raw3270_request *rq, void *data) | |
162 | { | |
163 | struct fs3270 *fp; | |
164 | ||
165 | fp = (struct fs3270 *) rq->view; | |
166 | ||
167 | /* Correct idal buffer element 0 address. */ | |
168 | fp->rdbuf->data[0] -= 5; | |
169 | fp->rdbuf->size += 5; | |
170 | ||
171 | /* | |
172 | * If the rdbuf command failed or the idal buffer is | |
173 | * to small for the amount of data returned by the | |
174 | * rdbuf command, then we have no choice but to send | |
175 | * a SIGHUP to the application. | |
176 | */ | |
177 | if (rq->rc != 0 || rq->rescnt == 0) { | |
178 | if (fp->fs_pid) | |
782237a2 | 179 | kill_pid(fp->fs_pid, SIGHUP, 1); |
ed3cb6f0 RH |
180 | fp->rdbuf_size = 0; |
181 | } else | |
182 | fp->rdbuf_size = fp->rdbuf->size - rq->rescnt; | |
183 | raw3270_request_reset(rq); | |
184 | wake_up(&fp->wait); | |
185 | } | |
186 | ||
1da177e4 LT |
187 | static void |
188 | fs3270_deactivate(struct raw3270_view *view) | |
189 | { | |
1da177e4 LT |
190 | struct fs3270 *fp; |
191 | ||
192 | fp = (struct fs3270 *) view; | |
ed3cb6f0 RH |
193 | fp->active = 0; |
194 | ||
195 | /* If an old init command is still running just return. */ | |
196 | if (!raw3270_request_final(fp->init)) | |
197 | return; | |
198 | ||
199 | /* Prepare read-buffer request. */ | |
200 | raw3270_request_set_cmd(fp->init, TC_RDBUF); | |
201 | /* | |
202 | * Hackish: skip first 5 bytes of the idal buffer to make | |
203 | * room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence | |
204 | * in the activation command. | |
205 | */ | |
206 | fp->rdbuf->data[0] += 5; | |
207 | fp->rdbuf->size -= 5; | |
208 | raw3270_request_set_idal(fp->init, fp->rdbuf); | |
209 | fp->init->rescnt = 0; | |
210 | fp->init->callback = fs3270_save_callback; | |
211 | ||
212 | /* Start I/O to read in the 3270 buffer. */ | |
213 | fp->init->rc = raw3270_start_locked(view, fp->init); | |
214 | if (fp->init->rc) | |
215 | fp->init->callback(fp->init, NULL); | |
1da177e4 LT |
216 | } |
217 | ||
218 | static int | |
219 | fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb) | |
220 | { | |
221 | /* Handle ATTN. Set indication and wake waiters for attention. */ | |
23d805b6 | 222 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { |
1da177e4 | 223 | fp->attention = 1; |
ed3cb6f0 | 224 | wake_up(&fp->wait); |
1da177e4 LT |
225 | } |
226 | ||
227 | if (rq) { | |
23d805b6 | 228 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) |
1da177e4 LT |
229 | rq->rc = -EIO; |
230 | else | |
231 | /* Normal end. Copy residual count. */ | |
23d805b6 | 232 | rq->rescnt = irb->scsw.cmd.count; |
1da177e4 LT |
233 | } |
234 | return RAW3270_IO_DONE; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Process reads from fullscreen 3270. | |
239 | */ | |
240 | static ssize_t | |
d2c993d8 | 241 | fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off) |
1da177e4 LT |
242 | { |
243 | struct fs3270 *fp; | |
244 | struct raw3270_request *rq; | |
245 | struct idal_buffer *ib; | |
ed3cb6f0 | 246 | ssize_t rc; |
1da177e4 LT |
247 | |
248 | if (count == 0 || count > 65535) | |
249 | return -EINVAL; | |
250 | fp = filp->private_data; | |
251 | if (!fp) | |
252 | return -ENODEV; | |
253 | ib = idal_buffer_alloc(count, 0); | |
ed3cb6f0 | 254 | if (IS_ERR(ib)) |
1da177e4 LT |
255 | return -ENOMEM; |
256 | rq = raw3270_request_alloc(0); | |
257 | if (!IS_ERR(rq)) { | |
258 | if (fp->read_command == 0 && fp->write_command != 0) | |
259 | fp->read_command = 6; | |
260 | raw3270_request_set_cmd(rq, fp->read_command ? : 2); | |
261 | raw3270_request_set_idal(rq, ib); | |
ed3cb6f0 RH |
262 | rc = wait_event_interruptible(fp->wait, fp->attention); |
263 | fp->attention = 0; | |
264 | if (rc == 0) { | |
265 | rc = fs3270_do_io(&fp->view, rq); | |
266 | if (rc == 0) { | |
267 | count -= rq->rescnt; | |
268 | if (idal_buffer_to_user(ib, data, count) != 0) | |
269 | rc = -EFAULT; | |
270 | else | |
271 | rc = count; | |
272 | ||
273 | } | |
274 | } | |
1da177e4 LT |
275 | raw3270_request_free(rq); |
276 | } else | |
277 | rc = PTR_ERR(rq); | |
278 | idal_buffer_free(ib); | |
279 | return rc; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Process writes to fullscreen 3270. | |
284 | */ | |
285 | static ssize_t | |
d2c993d8 | 286 | fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off) |
1da177e4 LT |
287 | { |
288 | struct fs3270 *fp; | |
289 | struct raw3270_request *rq; | |
290 | struct idal_buffer *ib; | |
291 | int write_command; | |
ed3cb6f0 | 292 | ssize_t rc; |
1da177e4 LT |
293 | |
294 | fp = filp->private_data; | |
295 | if (!fp) | |
296 | return -ENODEV; | |
297 | ib = idal_buffer_alloc(count, 0); | |
ed3cb6f0 | 298 | if (IS_ERR(ib)) |
1da177e4 LT |
299 | return -ENOMEM; |
300 | rq = raw3270_request_alloc(0); | |
301 | if (!IS_ERR(rq)) { | |
302 | if (idal_buffer_from_user(ib, data, count) == 0) { | |
303 | write_command = fp->write_command ? : 1; | |
304 | if (write_command == 5) | |
305 | write_command = 13; | |
306 | raw3270_request_set_cmd(rq, write_command); | |
307 | raw3270_request_set_idal(rq, ib); | |
308 | rc = fs3270_do_io(&fp->view, rq); | |
ed3cb6f0 RH |
309 | if (rc == 0) |
310 | rc = count - rq->rescnt; | |
1da177e4 LT |
311 | } else |
312 | rc = -EFAULT; | |
313 | raw3270_request_free(rq); | |
314 | } else | |
315 | rc = PTR_ERR(rq); | |
316 | idal_buffer_free(ib); | |
317 | return rc; | |
318 | } | |
319 | ||
320 | /* | |
321 | * process ioctl commands for the tube driver | |
322 | */ | |
0f75e00c CH |
323 | static long |
324 | fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 325 | { |
16e1a577 | 326 | char __user *argp; |
1da177e4 LT |
327 | struct fs3270 *fp; |
328 | struct raw3270_iocb iocb; | |
329 | int rc; | |
330 | ||
331 | fp = filp->private_data; | |
332 | if (!fp) | |
333 | return -ENODEV; | |
16e1a577 HC |
334 | if (is_compat_task()) |
335 | argp = compat_ptr(arg); | |
336 | else | |
337 | argp = (char __user *)arg; | |
1da177e4 | 338 | rc = 0; |
5cbb5f57 | 339 | mutex_lock(&fs3270_mutex); |
1da177e4 LT |
340 | switch (cmd) { |
341 | case TUBICMD: | |
342 | fp->read_command = arg; | |
343 | break; | |
344 | case TUBOCMD: | |
345 | fp->write_command = arg; | |
346 | break; | |
347 | case TUBGETI: | |
16e1a577 | 348 | rc = put_user(fp->read_command, argp); |
1da177e4 LT |
349 | break; |
350 | case TUBGETO: | |
16e1a577 | 351 | rc = put_user(fp->write_command, argp); |
1da177e4 LT |
352 | break; |
353 | case TUBGETMOD: | |
354 | iocb.model = fp->view.model; | |
355 | iocb.line_cnt = fp->view.rows; | |
356 | iocb.col_cnt = fp->view.cols; | |
357 | iocb.pf_cnt = 24; | |
358 | iocb.re_cnt = 20; | |
359 | iocb.map = 0; | |
16e1a577 | 360 | if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb))) |
1da177e4 LT |
361 | rc = -EFAULT; |
362 | break; | |
363 | } | |
5cbb5f57 | 364 | mutex_unlock(&fs3270_mutex); |
1da177e4 LT |
365 | return rc; |
366 | } | |
367 | ||
368 | /* | |
ed3cb6f0 | 369 | * Allocate fs3270 structure. |
1da177e4 LT |
370 | */ |
371 | static struct fs3270 * | |
372 | fs3270_alloc_view(void) | |
373 | { | |
374 | struct fs3270 *fp; | |
375 | ||
88abaab4 | 376 | fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL); |
1da177e4 LT |
377 | if (!fp) |
378 | return ERR_PTR(-ENOMEM); | |
ed3cb6f0 RH |
379 | fp->init = raw3270_request_alloc(0); |
380 | if (IS_ERR(fp->init)) { | |
1da177e4 LT |
381 | kfree(fp); |
382 | return ERR_PTR(-ENOMEM); | |
383 | } | |
384 | return fp; | |
385 | } | |
386 | ||
387 | /* | |
ed3cb6f0 | 388 | * Free fs3270 structure. |
1da177e4 LT |
389 | */ |
390 | static void | |
391 | fs3270_free_view(struct raw3270_view *view) | |
392 | { | |
ed3cb6f0 RH |
393 | struct fs3270 *fp; |
394 | ||
395 | fp = (struct fs3270 *) view; | |
396 | if (fp->rdbuf) | |
397 | idal_buffer_free(fp->rdbuf); | |
398 | raw3270_request_free(((struct fs3270 *) view)->init); | |
1da177e4 LT |
399 | kfree(view); |
400 | } | |
401 | ||
402 | /* | |
403 | * Unlink fs3270 data structure from filp. | |
404 | */ | |
405 | static void | |
406 | fs3270_release(struct raw3270_view *view) | |
407 | { | |
4b214a0c MS |
408 | struct fs3270 *fp; |
409 | ||
410 | fp = (struct fs3270 *) view; | |
411 | if (fp->fs_pid) | |
412 | kill_pid(fp->fs_pid, SIGHUP, 1); | |
1da177e4 LT |
413 | } |
414 | ||
415 | /* View to a 3270 device. Can be console, tty or fullscreen. */ | |
2b67fc46 | 416 | static struct raw3270_fn fs3270_fn = { |
1da177e4 LT |
417 | .activate = fs3270_activate, |
418 | .deactivate = fs3270_deactivate, | |
419 | .intv = (void *) fs3270_irq, | |
420 | .release = fs3270_release, | |
421 | .free = fs3270_free_view | |
422 | }; | |
423 | ||
424 | /* | |
425 | * This routine is called whenever a 3270 fullscreen device is opened. | |
426 | */ | |
427 | static int | |
428 | fs3270_open(struct inode *inode, struct file *filp) | |
429 | { | |
430 | struct fs3270 *fp; | |
ed3cb6f0 | 431 | struct idal_buffer *ib; |
a18992d4 | 432 | int minor, rc = 0; |
1da177e4 | 433 | |
49522c97 | 434 | if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR) |
1da177e4 | 435 | return -ENODEV; |
49522c97 | 436 | minor = iminor(filp->f_path.dentry->d_inode); |
ed3cb6f0 RH |
437 | /* Check for minor 0 multiplexer. */ |
438 | if (minor == 0) { | |
a90610e5 | 439 | struct tty_struct *tty = get_current_tty(); |
24ec839c | 440 | if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) { |
452a00d2 | 441 | tty_kref_put(tty); |
a18992d4 | 442 | return -ENODEV; |
24ec839c PZ |
443 | } |
444 | minor = tty->index + RAW3270_FIRSTMINOR; | |
452a00d2 | 445 | tty_kref_put(tty); |
ed3cb6f0 | 446 | } |
5cbb5f57 | 447 | mutex_lock(&fs3270_mutex); |
1da177e4 LT |
448 | /* Check if some other program is already using fullscreen mode. */ |
449 | fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor); | |
450 | if (!IS_ERR(fp)) { | |
451 | raw3270_put_view(&fp->view); | |
764a4a8e JC |
452 | rc = -EBUSY; |
453 | goto out; | |
1da177e4 LT |
454 | } |
455 | /* Allocate fullscreen view structure. */ | |
456 | fp = fs3270_alloc_view(); | |
764a4a8e JC |
457 | if (IS_ERR(fp)) { |
458 | rc = PTR_ERR(fp); | |
459 | goto out; | |
460 | } | |
1da177e4 | 461 | |
ed3cb6f0 | 462 | init_waitqueue_head(&fp->wait); |
782237a2 | 463 | fp->fs_pid = get_pid(task_pid(current)); |
1da177e4 LT |
464 | rc = raw3270_add_view(&fp->view, &fs3270_fn, minor); |
465 | if (rc) { | |
466 | fs3270_free_view(&fp->view); | |
764a4a8e | 467 | goto out; |
1da177e4 LT |
468 | } |
469 | ||
ed3cb6f0 RH |
470 | /* Allocate idal-buffer. */ |
471 | ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0); | |
472 | if (IS_ERR(ib)) { | |
473 | raw3270_put_view(&fp->view); | |
474 | raw3270_del_view(&fp->view); | |
2b31001d | 475 | rc = PTR_ERR(ib); |
764a4a8e | 476 | goto out; |
ed3cb6f0 RH |
477 | } |
478 | fp->rdbuf = ib; | |
479 | ||
1da177e4 LT |
480 | rc = raw3270_activate_view(&fp->view); |
481 | if (rc) { | |
ed3cb6f0 | 482 | raw3270_put_view(&fp->view); |
1da177e4 | 483 | raw3270_del_view(&fp->view); |
764a4a8e | 484 | goto out; |
1da177e4 LT |
485 | } |
486 | filp->private_data = fp; | |
764a4a8e | 487 | out: |
5cbb5f57 | 488 | mutex_unlock(&fs3270_mutex); |
a18992d4 | 489 | return rc; |
1da177e4 LT |
490 | } |
491 | ||
492 | /* | |
493 | * This routine is called when the 3270 tty is closed. We wait | |
494 | * for the remaining request to be completed. Then we clean up. | |
495 | */ | |
496 | static int | |
497 | fs3270_close(struct inode *inode, struct file *filp) | |
498 | { | |
499 | struct fs3270 *fp; | |
500 | ||
501 | fp = filp->private_data; | |
d2c993d8 | 502 | filp->private_data = NULL; |
ed3cb6f0 | 503 | if (fp) { |
782237a2 CLG |
504 | put_pid(fp->fs_pid); |
505 | fp->fs_pid = NULL; | |
ed3cb6f0 RH |
506 | raw3270_reset(&fp->view); |
507 | raw3270_put_view(&fp->view); | |
1da177e4 | 508 | raw3270_del_view(&fp->view); |
ed3cb6f0 | 509 | } |
1da177e4 LT |
510 | return 0; |
511 | } | |
512 | ||
d54b1fdb | 513 | static const struct file_operations fs3270_fops = { |
0f75e00c CH |
514 | .owner = THIS_MODULE, /* owner */ |
515 | .read = fs3270_read, /* read */ | |
516 | .write = fs3270_write, /* write */ | |
517 | .unlocked_ioctl = fs3270_ioctl, /* ioctl */ | |
518 | .compat_ioctl = fs3270_ioctl, /* ioctl */ | |
16e1a577 HC |
519 | .open = fs3270_open, /* open */ |
520 | .release = fs3270_close, /* release */ | |
1da177e4 LT |
521 | }; |
522 | ||
523 | /* | |
524 | * 3270 fullscreen driver initialization. | |
525 | */ | |
526 | static int __init | |
527 | fs3270_init(void) | |
528 | { | |
529 | int rc; | |
530 | ||
531 | rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops); | |
a26182ed | 532 | if (rc) |
1da177e4 | 533 | return rc; |
1da177e4 LT |
534 | return 0; |
535 | } | |
536 | ||
537 | static void __exit | |
538 | fs3270_exit(void) | |
539 | { | |
540 | unregister_chrdev(IBM_FS3270_MAJOR, "fs3270"); | |
541 | } | |
542 | ||
543 | MODULE_LICENSE("GPL"); | |
544 | MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR); | |
545 | ||
546 | module_init(fs3270_init); | |
547 | module_exit(fs3270_exit); |