Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/fs3270.c | |
3 | * IBM/3270 Driver - fullscreen driver. | |
4 | * | |
5 | * Author(s): | |
6 | * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) | |
7 | * Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com> | |
8 | * -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/bootmem.h> |
12 | #include <linux/console.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/types.h> | |
764a4a8e | 17 | #include <linux/smp_lock.h> |
1da177e4 LT |
18 | |
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 | ||
42 | static void | |
43 | fs3270_wake_up(struct raw3270_request *rq, void *data) | |
44 | { | |
45 | wake_up((wait_queue_head_t *) data); | |
46 | } | |
47 | ||
ed3cb6f0 RH |
48 | static inline int |
49 | fs3270_working(struct fs3270 *fp) | |
50 | { | |
51 | /* | |
52 | * The fullscreen view is in working order if the view | |
53 | * has been activated AND the initial request is finished. | |
54 | */ | |
55 | return fp->active && raw3270_request_final(fp->init); | |
56 | } | |
57 | ||
1da177e4 LT |
58 | static int |
59 | fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq) | |
60 | { | |
ed3cb6f0 | 61 | struct fs3270 *fp; |
1da177e4 LT |
62 | int rc; |
63 | ||
ed3cb6f0 | 64 | fp = (struct fs3270 *) view; |
1da177e4 | 65 | rq->callback = fs3270_wake_up; |
ed3cb6f0 RH |
66 | rq->callback_data = &fp->wait; |
67 | ||
68 | do { | |
69 | if (!fs3270_working(fp)) { | |
70 | /* Fullscreen view isn't ready yet. */ | |
71 | rc = wait_event_interruptible(fp->wait, | |
72 | fs3270_working(fp)); | |
73 | if (rc != 0) | |
74 | break; | |
75 | } | |
76 | rc = raw3270_start(view, rq); | |
77 | if (rc == 0) { | |
78 | /* Started sucessfully. Now wait for completion. */ | |
79 | wait_event(fp->wait, raw3270_request_final(rq)); | |
80 | } | |
81 | } while (rc == -EACCES); | |
82 | return rc; | |
1da177e4 LT |
83 | } |
84 | ||
ed3cb6f0 RH |
85 | /* |
86 | * Switch to the fullscreen view. | |
87 | */ | |
1da177e4 LT |
88 | static void |
89 | fs3270_reset_callback(struct raw3270_request *rq, void *data) | |
90 | { | |
ed3cb6f0 RH |
91 | struct fs3270 *fp; |
92 | ||
93 | fp = (struct fs3270 *) rq->view; | |
1da177e4 | 94 | raw3270_request_reset(rq); |
ed3cb6f0 RH |
95 | wake_up(&fp->wait); |
96 | } | |
97 | ||
98 | static void | |
99 | fs3270_restore_callback(struct raw3270_request *rq, void *data) | |
100 | { | |
101 | struct fs3270 *fp; | |
102 | ||
103 | fp = (struct fs3270 *) rq->view; | |
104 | if (rq->rc != 0 || rq->rescnt != 0) { | |
105 | if (fp->fs_pid) | |
782237a2 | 106 | kill_pid(fp->fs_pid, SIGHUP, 1); |
ed3cb6f0 RH |
107 | } |
108 | fp->rdbuf_size = 0; | |
109 | raw3270_request_reset(rq); | |
110 | wake_up(&fp->wait); | |
1da177e4 LT |
111 | } |
112 | ||
1da177e4 LT |
113 | static int |
114 | fs3270_activate(struct raw3270_view *view) | |
115 | { | |
116 | struct fs3270 *fp; | |
ed3cb6f0 RH |
117 | char *cp; |
118 | int rc; | |
1da177e4 LT |
119 | |
120 | fp = (struct fs3270 *) view; | |
ed3cb6f0 RH |
121 | |
122 | /* If an old init command is still running just return. */ | |
123 | if (!raw3270_request_final(fp->init)) | |
124 | return 0; | |
125 | ||
126 | if (fp->rdbuf_size == 0) { | |
127 | /* No saved buffer. Just clear the screen. */ | |
128 | raw3270_request_set_cmd(fp->init, TC_EWRITEA); | |
129 | fp->init->callback = fs3270_reset_callback; | |
130 | } else { | |
131 | /* Restore fullscreen buffer saved by fs3270_deactivate. */ | |
132 | raw3270_request_set_cmd(fp->init, TC_EWRITEA); | |
133 | raw3270_request_set_idal(fp->init, fp->rdbuf); | |
134 | fp->init->ccw.count = fp->rdbuf_size; | |
135 | cp = fp->rdbuf->data[0]; | |
136 | cp[0] = TW_KR; | |
137 | cp[1] = TO_SBA; | |
138 | cp[2] = cp[6]; | |
139 | cp[3] = cp[7]; | |
140 | cp[4] = TO_IC; | |
141 | cp[5] = TO_SBA; | |
142 | cp[6] = 0x40; | |
143 | cp[7] = 0x40; | |
144 | fp->init->rescnt = 0; | |
145 | fp->init->callback = fs3270_restore_callback; | |
146 | } | |
147 | rc = fp->init->rc = raw3270_start_locked(view, fp->init); | |
148 | if (rc) | |
149 | fp->init->callback(fp->init, NULL); | |
150 | else | |
151 | fp->active = 1; | |
152 | return rc; | |
1da177e4 LT |
153 | } |
154 | ||
155 | /* | |
156 | * Shutdown fullscreen view. | |
157 | */ | |
ed3cb6f0 RH |
158 | static void |
159 | fs3270_save_callback(struct raw3270_request *rq, void *data) | |
160 | { | |
161 | struct fs3270 *fp; | |
162 | ||
163 | fp = (struct fs3270 *) rq->view; | |
164 | ||
165 | /* Correct idal buffer element 0 address. */ | |
166 | fp->rdbuf->data[0] -= 5; | |
167 | fp->rdbuf->size += 5; | |
168 | ||
169 | /* | |
170 | * If the rdbuf command failed or the idal buffer is | |
171 | * to small for the amount of data returned by the | |
172 | * rdbuf command, then we have no choice but to send | |
173 | * a SIGHUP to the application. | |
174 | */ | |
175 | if (rq->rc != 0 || rq->rescnt == 0) { | |
176 | if (fp->fs_pid) | |
782237a2 | 177 | kill_pid(fp->fs_pid, SIGHUP, 1); |
ed3cb6f0 RH |
178 | fp->rdbuf_size = 0; |
179 | } else | |
180 | fp->rdbuf_size = fp->rdbuf->size - rq->rescnt; | |
181 | raw3270_request_reset(rq); | |
182 | wake_up(&fp->wait); | |
183 | } | |
184 | ||
1da177e4 LT |
185 | static void |
186 | fs3270_deactivate(struct raw3270_view *view) | |
187 | { | |
1da177e4 LT |
188 | struct fs3270 *fp; |
189 | ||
190 | fp = (struct fs3270 *) view; | |
ed3cb6f0 RH |
191 | fp->active = 0; |
192 | ||
193 | /* If an old init command is still running just return. */ | |
194 | if (!raw3270_request_final(fp->init)) | |
195 | return; | |
196 | ||
197 | /* Prepare read-buffer request. */ | |
198 | raw3270_request_set_cmd(fp->init, TC_RDBUF); | |
199 | /* | |
200 | * Hackish: skip first 5 bytes of the idal buffer to make | |
201 | * room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence | |
202 | * in the activation command. | |
203 | */ | |
204 | fp->rdbuf->data[0] += 5; | |
205 | fp->rdbuf->size -= 5; | |
206 | raw3270_request_set_idal(fp->init, fp->rdbuf); | |
207 | fp->init->rescnt = 0; | |
208 | fp->init->callback = fs3270_save_callback; | |
209 | ||
210 | /* Start I/O to read in the 3270 buffer. */ | |
211 | fp->init->rc = raw3270_start_locked(view, fp->init); | |
212 | if (fp->init->rc) | |
213 | fp->init->callback(fp->init, NULL); | |
1da177e4 LT |
214 | } |
215 | ||
216 | static int | |
217 | fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb) | |
218 | { | |
219 | /* Handle ATTN. Set indication and wake waiters for attention. */ | |
23d805b6 | 220 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { |
1da177e4 | 221 | fp->attention = 1; |
ed3cb6f0 | 222 | wake_up(&fp->wait); |
1da177e4 LT |
223 | } |
224 | ||
225 | if (rq) { | |
23d805b6 | 226 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) |
1da177e4 LT |
227 | rq->rc = -EIO; |
228 | else | |
229 | /* Normal end. Copy residual count. */ | |
23d805b6 | 230 | rq->rescnt = irb->scsw.cmd.count; |
1da177e4 LT |
231 | } |
232 | return RAW3270_IO_DONE; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Process reads from fullscreen 3270. | |
237 | */ | |
238 | static ssize_t | |
d2c993d8 | 239 | fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off) |
1da177e4 LT |
240 | { |
241 | struct fs3270 *fp; | |
242 | struct raw3270_request *rq; | |
243 | struct idal_buffer *ib; | |
ed3cb6f0 | 244 | ssize_t rc; |
1da177e4 LT |
245 | |
246 | if (count == 0 || count > 65535) | |
247 | return -EINVAL; | |
248 | fp = filp->private_data; | |
249 | if (!fp) | |
250 | return -ENODEV; | |
251 | ib = idal_buffer_alloc(count, 0); | |
ed3cb6f0 | 252 | if (IS_ERR(ib)) |
1da177e4 LT |
253 | return -ENOMEM; |
254 | rq = raw3270_request_alloc(0); | |
255 | if (!IS_ERR(rq)) { | |
256 | if (fp->read_command == 0 && fp->write_command != 0) | |
257 | fp->read_command = 6; | |
258 | raw3270_request_set_cmd(rq, fp->read_command ? : 2); | |
259 | raw3270_request_set_idal(rq, ib); | |
ed3cb6f0 RH |
260 | rc = wait_event_interruptible(fp->wait, fp->attention); |
261 | fp->attention = 0; | |
262 | if (rc == 0) { | |
263 | rc = fs3270_do_io(&fp->view, rq); | |
264 | if (rc == 0) { | |
265 | count -= rq->rescnt; | |
266 | if (idal_buffer_to_user(ib, data, count) != 0) | |
267 | rc = -EFAULT; | |
268 | else | |
269 | rc = count; | |
270 | ||
271 | } | |
272 | } | |
1da177e4 LT |
273 | raw3270_request_free(rq); |
274 | } else | |
275 | rc = PTR_ERR(rq); | |
276 | idal_buffer_free(ib); | |
277 | return rc; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Process writes to fullscreen 3270. | |
282 | */ | |
283 | static ssize_t | |
d2c993d8 | 284 | fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off) |
1da177e4 LT |
285 | { |
286 | struct fs3270 *fp; | |
287 | struct raw3270_request *rq; | |
288 | struct idal_buffer *ib; | |
289 | int write_command; | |
ed3cb6f0 | 290 | ssize_t rc; |
1da177e4 LT |
291 | |
292 | fp = filp->private_data; | |
293 | if (!fp) | |
294 | return -ENODEV; | |
295 | ib = idal_buffer_alloc(count, 0); | |
ed3cb6f0 | 296 | if (IS_ERR(ib)) |
1da177e4 LT |
297 | return -ENOMEM; |
298 | rq = raw3270_request_alloc(0); | |
299 | if (!IS_ERR(rq)) { | |
300 | if (idal_buffer_from_user(ib, data, count) == 0) { | |
301 | write_command = fp->write_command ? : 1; | |
302 | if (write_command == 5) | |
303 | write_command = 13; | |
304 | raw3270_request_set_cmd(rq, write_command); | |
305 | raw3270_request_set_idal(rq, ib); | |
306 | rc = fs3270_do_io(&fp->view, rq); | |
ed3cb6f0 RH |
307 | if (rc == 0) |
308 | rc = count - rq->rescnt; | |
1da177e4 LT |
309 | } else |
310 | rc = -EFAULT; | |
311 | raw3270_request_free(rq); | |
312 | } else | |
313 | rc = PTR_ERR(rq); | |
314 | idal_buffer_free(ib); | |
315 | return rc; | |
316 | } | |
317 | ||
318 | /* | |
319 | * process ioctl commands for the tube driver | |
320 | */ | |
0f75e00c CH |
321 | static long |
322 | fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
323 | { |
324 | struct fs3270 *fp; | |
325 | struct raw3270_iocb iocb; | |
326 | int rc; | |
327 | ||
328 | fp = filp->private_data; | |
329 | if (!fp) | |
330 | return -ENODEV; | |
331 | rc = 0; | |
0f75e00c | 332 | lock_kernel(); |
1da177e4 LT |
333 | switch (cmd) { |
334 | case TUBICMD: | |
335 | fp->read_command = arg; | |
336 | break; | |
337 | case TUBOCMD: | |
338 | fp->write_command = arg; | |
339 | break; | |
340 | case TUBGETI: | |
d2c993d8 | 341 | rc = put_user(fp->read_command, (char __user *) arg); |
1da177e4 LT |
342 | break; |
343 | case TUBGETO: | |
d2c993d8 | 344 | rc = put_user(fp->write_command,(char __user *) arg); |
1da177e4 LT |
345 | break; |
346 | case TUBGETMOD: | |
347 | iocb.model = fp->view.model; | |
348 | iocb.line_cnt = fp->view.rows; | |
349 | iocb.col_cnt = fp->view.cols; | |
350 | iocb.pf_cnt = 24; | |
351 | iocb.re_cnt = 20; | |
352 | iocb.map = 0; | |
d2c993d8 | 353 | if (copy_to_user((char __user *) arg, &iocb, |
1da177e4 LT |
354 | sizeof(struct raw3270_iocb))) |
355 | rc = -EFAULT; | |
356 | break; | |
357 | } | |
0f75e00c | 358 | unlock_kernel(); |
1da177e4 LT |
359 | return rc; |
360 | } | |
361 | ||
362 | /* | |
ed3cb6f0 | 363 | * Allocate fs3270 structure. |
1da177e4 LT |
364 | */ |
365 | static struct fs3270 * | |
366 | fs3270_alloc_view(void) | |
367 | { | |
368 | struct fs3270 *fp; | |
369 | ||
88abaab4 | 370 | fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL); |
1da177e4 LT |
371 | if (!fp) |
372 | return ERR_PTR(-ENOMEM); | |
ed3cb6f0 RH |
373 | fp->init = raw3270_request_alloc(0); |
374 | if (IS_ERR(fp->init)) { | |
1da177e4 LT |
375 | kfree(fp); |
376 | return ERR_PTR(-ENOMEM); | |
377 | } | |
378 | return fp; | |
379 | } | |
380 | ||
381 | /* | |
ed3cb6f0 | 382 | * Free fs3270 structure. |
1da177e4 LT |
383 | */ |
384 | static void | |
385 | fs3270_free_view(struct raw3270_view *view) | |
386 | { | |
ed3cb6f0 RH |
387 | struct fs3270 *fp; |
388 | ||
389 | fp = (struct fs3270 *) view; | |
390 | if (fp->rdbuf) | |
391 | idal_buffer_free(fp->rdbuf); | |
392 | raw3270_request_free(((struct fs3270 *) view)->init); | |
1da177e4 LT |
393 | kfree(view); |
394 | } | |
395 | ||
396 | /* | |
397 | * Unlink fs3270 data structure from filp. | |
398 | */ | |
399 | static void | |
400 | fs3270_release(struct raw3270_view *view) | |
401 | { | |
402 | } | |
403 | ||
404 | /* View to a 3270 device. Can be console, tty or fullscreen. */ | |
2b67fc46 | 405 | static struct raw3270_fn fs3270_fn = { |
1da177e4 LT |
406 | .activate = fs3270_activate, |
407 | .deactivate = fs3270_deactivate, | |
408 | .intv = (void *) fs3270_irq, | |
409 | .release = fs3270_release, | |
410 | .free = fs3270_free_view | |
411 | }; | |
412 | ||
413 | /* | |
414 | * This routine is called whenever a 3270 fullscreen device is opened. | |
415 | */ | |
416 | static int | |
417 | fs3270_open(struct inode *inode, struct file *filp) | |
418 | { | |
419 | struct fs3270 *fp; | |
ed3cb6f0 | 420 | struct idal_buffer *ib; |
1da177e4 LT |
421 | int minor, rc; |
422 | ||
49522c97 | 423 | if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR) |
1da177e4 | 424 | return -ENODEV; |
764a4a8e | 425 | lock_kernel(); |
49522c97 | 426 | minor = iminor(filp->f_path.dentry->d_inode); |
ed3cb6f0 RH |
427 | /* Check for minor 0 multiplexer. */ |
428 | if (minor == 0) { | |
24ec839c PZ |
429 | struct tty_struct *tty; |
430 | mutex_lock(&tty_mutex); | |
431 | tty = get_current_tty(); | |
432 | if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) { | |
433 | mutex_unlock(&tty_mutex); | |
764a4a8e JC |
434 | rc = -ENODEV; |
435 | goto out; | |
24ec839c PZ |
436 | } |
437 | minor = tty->index + RAW3270_FIRSTMINOR; | |
438 | mutex_unlock(&tty_mutex); | |
ed3cb6f0 | 439 | } |
1da177e4 LT |
440 | /* Check if some other program is already using fullscreen mode. */ |
441 | fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor); | |
442 | if (!IS_ERR(fp)) { | |
443 | raw3270_put_view(&fp->view); | |
764a4a8e JC |
444 | rc = -EBUSY; |
445 | goto out; | |
1da177e4 LT |
446 | } |
447 | /* Allocate fullscreen view structure. */ | |
448 | fp = fs3270_alloc_view(); | |
764a4a8e JC |
449 | if (IS_ERR(fp)) { |
450 | rc = PTR_ERR(fp); | |
451 | goto out; | |
452 | } | |
1da177e4 | 453 | |
ed3cb6f0 | 454 | init_waitqueue_head(&fp->wait); |
782237a2 | 455 | fp->fs_pid = get_pid(task_pid(current)); |
1da177e4 LT |
456 | rc = raw3270_add_view(&fp->view, &fs3270_fn, minor); |
457 | if (rc) { | |
458 | fs3270_free_view(&fp->view); | |
764a4a8e | 459 | goto out; |
1da177e4 LT |
460 | } |
461 | ||
ed3cb6f0 RH |
462 | /* Allocate idal-buffer. */ |
463 | ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0); | |
464 | if (IS_ERR(ib)) { | |
465 | raw3270_put_view(&fp->view); | |
466 | raw3270_del_view(&fp->view); | |
764a4a8e JC |
467 | rc = PTR_ERR(fp); |
468 | goto out; | |
ed3cb6f0 RH |
469 | } |
470 | fp->rdbuf = ib; | |
471 | ||
1da177e4 LT |
472 | rc = raw3270_activate_view(&fp->view); |
473 | if (rc) { | |
ed3cb6f0 | 474 | raw3270_put_view(&fp->view); |
1da177e4 | 475 | raw3270_del_view(&fp->view); |
764a4a8e | 476 | goto out; |
1da177e4 LT |
477 | } |
478 | filp->private_data = fp; | |
764a4a8e JC |
479 | out: |
480 | unlock_kernel(); | |
1da177e4 LT |
481 | return 0; |
482 | } | |
483 | ||
484 | /* | |
485 | * This routine is called when the 3270 tty is closed. We wait | |
486 | * for the remaining request to be completed. Then we clean up. | |
487 | */ | |
488 | static int | |
489 | fs3270_close(struct inode *inode, struct file *filp) | |
490 | { | |
491 | struct fs3270 *fp; | |
492 | ||
493 | fp = filp->private_data; | |
d2c993d8 | 494 | filp->private_data = NULL; |
ed3cb6f0 | 495 | if (fp) { |
782237a2 CLG |
496 | put_pid(fp->fs_pid); |
497 | fp->fs_pid = NULL; | |
ed3cb6f0 RH |
498 | raw3270_reset(&fp->view); |
499 | raw3270_put_view(&fp->view); | |
1da177e4 | 500 | raw3270_del_view(&fp->view); |
ed3cb6f0 | 501 | } |
1da177e4 LT |
502 | return 0; |
503 | } | |
504 | ||
d54b1fdb | 505 | static const struct file_operations fs3270_fops = { |
0f75e00c CH |
506 | .owner = THIS_MODULE, /* owner */ |
507 | .read = fs3270_read, /* read */ | |
508 | .write = fs3270_write, /* write */ | |
509 | .unlocked_ioctl = fs3270_ioctl, /* ioctl */ | |
510 | .compat_ioctl = fs3270_ioctl, /* ioctl */ | |
511 | .open = fs3270_open, /* open */ | |
512 | .release = fs3270_close, /* release */ | |
1da177e4 LT |
513 | }; |
514 | ||
515 | /* | |
516 | * 3270 fullscreen driver initialization. | |
517 | */ | |
518 | static int __init | |
519 | fs3270_init(void) | |
520 | { | |
521 | int rc; | |
522 | ||
523 | rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops); | |
a26182ed | 524 | if (rc) |
1da177e4 | 525 | return rc; |
1da177e4 LT |
526 | return 0; |
527 | } | |
528 | ||
529 | static void __exit | |
530 | fs3270_exit(void) | |
531 | { | |
532 | unregister_chrdev(IBM_FS3270_MAJOR, "fs3270"); | |
533 | } | |
534 | ||
535 | MODULE_LICENSE("GPL"); | |
536 | MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR); | |
537 | ||
538 | module_init(fs3270_init); | |
539 | module_exit(fs3270_exit); |