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