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1da177e4 LT |
1 | /* $Id: divasi.c,v 1.25.6.2 2005/01/31 12:22:20 armin Exp $ |
2 | * | |
3 | * Driver for Eicon DIVA Server ISDN cards. | |
475be4d8 | 4 | * User Mode IDI Interface |
1da177e4 LT |
5 | * |
6 | * Copyright 2000-2003 by Armin Schindler ([email protected]) | |
7 | * Copyright 2000-2003 Cytronics & Melware ([email protected]) | |
8 | * | |
9 | * This software may be used and distributed according to the terms | |
10 | * of the GNU General Public License, incorporated herein by reference. | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/sched.h> | |
1da177e4 LT |
17 | #include <linux/poll.h> |
18 | #include <linux/proc_fs.h> | |
19 | #include <linux/skbuff.h> | |
9a58a80a | 20 | #include <linux/seq_file.h> |
7c0f6ba6 | 21 | #include <linux/uaccess.h> |
1da177e4 LT |
22 | |
23 | #include "platform.h" | |
24 | #include "di_defs.h" | |
25 | #include "divasync.h" | |
26 | #include "um_xdi.h" | |
27 | #include "um_idi.h" | |
28 | ||
29 | static char *main_revision = "$Revision: 1.25.6.2 $"; | |
30 | ||
31 | static int major; | |
32 | ||
33 | MODULE_DESCRIPTION("User IDI Interface for Eicon ISDN cards"); | |
34 | MODULE_AUTHOR("Cytronics & Melware, Eicon Networks"); | |
35 | MODULE_SUPPORTED_DEVICE("DIVA card driver"); | |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
38 | typedef struct _diva_um_idi_os_context { | |
39 | wait_queue_head_t read_wait; | |
40 | wait_queue_head_t close_wait; | |
41 | struct timer_list diva_timer_id; | |
42 | int aborted; | |
43 | int adapter_nr; | |
44 | } diva_um_idi_os_context_t; | |
45 | ||
46 | static char *DRIVERNAME = "Eicon DIVA - User IDI (http://www.melware.net)"; | |
47 | static char *DRIVERLNAME = "diva_idi"; | |
48 | static char *DEVNAME = "DivasIDI"; | |
49 | char *DRIVERRELEASE_IDI = "2.0"; | |
50 | ||
51 | extern int idifunc_init(void); | |
52 | extern void idifunc_finit(void); | |
53 | ||
54 | /* | |
55 | * helper functions | |
56 | */ | |
57 | static char *getrev(const char *revision) | |
58 | { | |
59 | char *rev; | |
60 | char *p; | |
61 | if ((p = strchr(revision, ':'))) { | |
62 | rev = p + 2; | |
63 | p = strchr(rev, '$'); | |
64 | *--p = 0; | |
65 | } else | |
66 | rev = "1.0"; | |
67 | return rev; | |
68 | } | |
69 | ||
70 | /* | |
71 | * LOCALS | |
72 | */ | |
73 | static ssize_t um_idi_read(struct file *file, char __user *buf, size_t count, | |
475be4d8 | 74 | loff_t *offset); |
1da177e4 | 75 | static ssize_t um_idi_write(struct file *file, const char __user *buf, |
475be4d8 | 76 | size_t count, loff_t *offset); |
afc9a42b | 77 | static __poll_t um_idi_poll(struct file *file, poll_table *wait); |
1da177e4 LT |
78 | static int um_idi_open(struct inode *inode, struct file *file); |
79 | static int um_idi_release(struct inode *inode, struct file *file); | |
80 | static int remove_entity(void *entity); | |
e99e88a9 | 81 | static void diva_um_timer_function(struct timer_list *t); |
1da177e4 LT |
82 | |
83 | /* | |
84 | * proc entry | |
85 | */ | |
86 | extern struct proc_dir_entry *proc_net_eicon; | |
87 | static struct proc_dir_entry *um_idi_proc_entry = NULL; | |
88 | ||
9a58a80a | 89 | static int um_idi_proc_show(struct seq_file *m, void *v) |
1da177e4 | 90 | { |
1da177e4 LT |
91 | char tmprev[32]; |
92 | ||
9a58a80a AD |
93 | seq_printf(m, "%s\n", DRIVERNAME); |
94 | seq_printf(m, "name : %s\n", DRIVERLNAME); | |
95 | seq_printf(m, "release : %s\n", DRIVERRELEASE_IDI); | |
1da177e4 | 96 | strcpy(tmprev, main_revision); |
9a58a80a AD |
97 | seq_printf(m, "revision : %s\n", getrev(tmprev)); |
98 | seq_printf(m, "build : %s\n", DIVA_BUILD); | |
99 | seq_printf(m, "major : %d\n", major); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
d7398892 | 104 | static int __init create_um_idi_proc(void) |
1da177e4 | 105 | { |
3f3942ac CH |
106 | um_idi_proc_entry = proc_create_single(DRIVERLNAME, S_IRUGO, |
107 | proc_net_eicon, um_idi_proc_show); | |
1da177e4 LT |
108 | if (!um_idi_proc_entry) |
109 | return (0); | |
1da177e4 LT |
110 | return (1); |
111 | } | |
112 | ||
113 | static void remove_um_idi_proc(void) | |
114 | { | |
115 | if (um_idi_proc_entry) { | |
116 | remove_proc_entry(DRIVERLNAME, proc_net_eicon); | |
117 | um_idi_proc_entry = NULL; | |
118 | } | |
119 | } | |
120 | ||
2b8693c0 | 121 | static const struct file_operations divas_idi_fops = { |
1da177e4 LT |
122 | .owner = THIS_MODULE, |
123 | .llseek = no_llseek, | |
124 | .read = um_idi_read, | |
125 | .write = um_idi_write, | |
126 | .poll = um_idi_poll, | |
127 | .open = um_idi_open, | |
128 | .release = um_idi_release | |
129 | }; | |
130 | ||
131 | static void divas_idi_unregister_chrdev(void) | |
132 | { | |
1da177e4 LT |
133 | unregister_chrdev(major, DEVNAME); |
134 | } | |
135 | ||
d7398892 | 136 | static int __init divas_idi_register_chrdev(void) |
1da177e4 LT |
137 | { |
138 | if ((major = register_chrdev(0, DEVNAME, &divas_idi_fops)) < 0) | |
139 | { | |
140 | printk(KERN_ERR "%s: failed to create /dev entry.\n", | |
141 | DRIVERLNAME); | |
142 | return (0); | |
143 | } | |
1da177e4 LT |
144 | |
145 | return (1); | |
146 | } | |
147 | ||
148 | /* | |
149 | ** Driver Load | |
150 | */ | |
d7398892 | 151 | static int __init divasi_init(void) |
1da177e4 LT |
152 | { |
153 | char tmprev[50]; | |
154 | int ret = 0; | |
155 | ||
156 | printk(KERN_INFO "%s\n", DRIVERNAME); | |
157 | printk(KERN_INFO "%s: Rel:%s Rev:", DRIVERLNAME, DRIVERRELEASE_IDI); | |
158 | strcpy(tmprev, main_revision); | |
159 | printk("%s Build: %s\n", getrev(tmprev), DIVA_BUILD); | |
160 | ||
161 | if (!divas_idi_register_chrdev()) { | |
162 | ret = -EIO; | |
163 | goto out; | |
164 | } | |
165 | ||
166 | if (!create_um_idi_proc()) { | |
167 | divas_idi_unregister_chrdev(); | |
168 | printk(KERN_ERR "%s: failed to create proc entry.\n", | |
169 | DRIVERLNAME); | |
170 | ret = -EIO; | |
171 | goto out; | |
172 | } | |
173 | ||
174 | if (!(idifunc_init())) { | |
175 | remove_um_idi_proc(); | |
176 | divas_idi_unregister_chrdev(); | |
177 | printk(KERN_ERR "%s: failed to connect to DIDD.\n", | |
178 | DRIVERLNAME); | |
179 | ret = -EIO; | |
180 | goto out; | |
181 | } | |
182 | printk(KERN_INFO "%s: started with major %d\n", DRIVERLNAME, major); | |
183 | ||
475be4d8 | 184 | out: |
1da177e4 LT |
185 | return (ret); |
186 | } | |
187 | ||
188 | ||
189 | /* | |
190 | ** Driver Unload | |
191 | */ | |
d7398892 | 192 | static void __exit divasi_exit(void) |
1da177e4 LT |
193 | { |
194 | idifunc_finit(); | |
195 | remove_um_idi_proc(); | |
196 | divas_idi_unregister_chrdev(); | |
197 | ||
198 | printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME); | |
199 | } | |
200 | ||
201 | module_init(divasi_init); | |
202 | module_exit(divasi_exit); | |
203 | ||
204 | ||
205 | /* | |
206 | * FILE OPERATIONS | |
207 | */ | |
208 | ||
209 | static int | |
210 | divas_um_idi_copy_to_user(void *os_handle, void *dst, const void *src, | |
211 | int length) | |
212 | { | |
213 | memcpy(dst, src, length); | |
214 | return (length); | |
215 | } | |
216 | ||
217 | static ssize_t | |
475be4d8 | 218 | um_idi_read(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4 LT |
219 | { |
220 | diva_um_idi_os_context_t *p_os; | |
221 | int ret = -EINVAL; | |
222 | void *data; | |
223 | ||
224 | if (!file->private_data) { | |
225 | return (-ENODEV); | |
226 | } | |
227 | ||
228 | if (! | |
229 | (p_os = | |
230 | (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file-> | |
231 | private_data))) | |
232 | { | |
233 | return (-ENODEV); | |
234 | } | |
235 | if (p_os->aborted) { | |
236 | return (-ENODEV); | |
237 | } | |
238 | ||
239 | if (!(data = diva_os_malloc(0, count))) { | |
240 | return (-ENOMEM); | |
241 | } | |
242 | ||
243 | ret = diva_um_idi_read(file->private_data, | |
244 | file, data, count, | |
245 | divas_um_idi_copy_to_user); | |
246 | switch (ret) { | |
247 | case 0: /* no message available */ | |
248 | ret = (-EAGAIN); | |
249 | break; | |
250 | case (-1): /* adapter was removed */ | |
251 | ret = (-ENODEV); | |
252 | break; | |
253 | case (-2): /* message_length > length of user buffer */ | |
254 | ret = (-EFAULT); | |
255 | break; | |
256 | } | |
257 | ||
258 | if (ret > 0) { | |
259 | if (copy_to_user(buf, data, ret)) { | |
260 | ret = (-EFAULT); | |
261 | } | |
262 | } | |
263 | ||
264 | diva_os_free(0, data); | |
265 | DBG_TRC(("read: ret %d", ret)); | |
266 | return (ret); | |
267 | } | |
268 | ||
269 | ||
270 | static int | |
271 | divas_um_idi_copy_from_user(void *os_handle, void *dst, const void *src, | |
272 | int length) | |
273 | { | |
274 | memcpy(dst, src, length); | |
275 | return (length); | |
276 | } | |
277 | ||
278 | static int um_idi_open_adapter(struct file *file, int adapter_nr) | |
279 | { | |
280 | diva_um_idi_os_context_t *p_os; | |
281 | void *e = | |
475be4d8 | 282 | divas_um_idi_create_entity((dword) adapter_nr, (void *) file); |
1da177e4 LT |
283 | |
284 | if (!(file->private_data = e)) { | |
285 | return (0); | |
286 | } | |
287 | p_os = (diva_um_idi_os_context_t *) diva_um_id_get_os_context(e); | |
288 | init_waitqueue_head(&p_os->read_wait); | |
289 | init_waitqueue_head(&p_os->close_wait); | |
e99e88a9 | 290 | timer_setup(&p_os->diva_timer_id, diva_um_timer_function, 0); |
1da177e4 LT |
291 | p_os->aborted = 0; |
292 | p_os->adapter_nr = adapter_nr; | |
293 | return (1); | |
294 | } | |
295 | ||
296 | static ssize_t | |
297 | um_idi_write(struct file *file, const char __user *buf, size_t count, | |
475be4d8 | 298 | loff_t *offset) |
1da177e4 LT |
299 | { |
300 | diva_um_idi_os_context_t *p_os; | |
301 | int ret = -EINVAL; | |
302 | void *data; | |
303 | int adapter_nr = 0; | |
304 | ||
305 | if (!file->private_data) { | |
306 | /* the first write() selects the adapter_nr */ | |
307 | if (count == sizeof(int)) { | |
308 | if (copy_from_user | |
309 | ((void *) &adapter_nr, buf, | |
310 | count)) return (-EFAULT); | |
311 | if (!(um_idi_open_adapter(file, adapter_nr))) | |
312 | return (-ENODEV); | |
313 | return (count); | |
314 | } else | |
315 | return (-ENODEV); | |
316 | } | |
317 | ||
318 | if (!(p_os = | |
475be4d8 JP |
319 | (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file-> |
320 | private_data))) | |
1da177e4 LT |
321 | { |
322 | return (-ENODEV); | |
323 | } | |
324 | if (p_os->aborted) { | |
325 | return (-ENODEV); | |
326 | } | |
327 | ||
328 | if (!(data = diva_os_malloc(0, count))) { | |
329 | return (-ENOMEM); | |
330 | } | |
331 | ||
332 | if (copy_from_user(data, buf, count)) { | |
333 | ret = -EFAULT; | |
334 | } else { | |
335 | ret = diva_um_idi_write(file->private_data, | |
336 | file, data, count, | |
337 | divas_um_idi_copy_from_user); | |
338 | switch (ret) { | |
339 | case 0: /* no space available */ | |
340 | ret = (-EAGAIN); | |
341 | break; | |
342 | case (-1): /* adapter was removed */ | |
343 | ret = (-ENODEV); | |
344 | break; | |
345 | case (-2): /* length of user buffer > max message_length */ | |
346 | ret = (-EFAULT); | |
347 | break; | |
348 | } | |
349 | } | |
350 | diva_os_free(0, data); | |
351 | DBG_TRC(("write: ret %d", ret)); | |
352 | return (ret); | |
353 | } | |
354 | ||
afc9a42b | 355 | static __poll_t um_idi_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
356 | { |
357 | diva_um_idi_os_context_t *p_os; | |
358 | ||
359 | if (!file->private_data) { | |
a9a08845 | 360 | return (EPOLLERR); |
1da177e4 LT |
361 | } |
362 | ||
363 | if ((!(p_os = | |
364 | (diva_um_idi_os_context_t *) | |
365 | diva_um_id_get_os_context(file->private_data))) | |
366 | || p_os->aborted) { | |
a9a08845 | 367 | return (EPOLLERR); |
1da177e4 LT |
368 | } |
369 | ||
370 | poll_wait(file, &p_os->read_wait, wait); | |
371 | ||
372 | if (p_os->aborted) { | |
a9a08845 | 373 | return (EPOLLERR); |
1da177e4 LT |
374 | } |
375 | ||
376 | switch (diva_user_mode_idi_ind_ready(file->private_data, file)) { | |
377 | case (-1): | |
a9a08845 | 378 | return (EPOLLERR); |
1da177e4 LT |
379 | |
380 | case 0: | |
381 | return (0); | |
382 | } | |
383 | ||
a9a08845 | 384 | return (EPOLLIN | EPOLLRDNORM); |
1da177e4 LT |
385 | } |
386 | ||
387 | static int um_idi_open(struct inode *inode, struct file *file) | |
388 | { | |
389 | return (0); | |
390 | } | |
391 | ||
392 | ||
393 | static int um_idi_release(struct inode *inode, struct file *file) | |
394 | { | |
395 | diva_um_idi_os_context_t *p_os; | |
396 | unsigned int adapter_nr; | |
397 | int ret = 0; | |
398 | ||
399 | if (!(file->private_data)) { | |
400 | ret = -ENODEV; | |
401 | goto out; | |
402 | } | |
403 | ||
404 | if (!(p_os = | |
475be4d8 | 405 | (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->private_data))) { |
1da177e4 LT |
406 | ret = -ENODEV; |
407 | goto out; | |
408 | } | |
409 | ||
410 | adapter_nr = p_os->adapter_nr; | |
411 | ||
412 | if ((ret = remove_entity(file->private_data))) { | |
413 | goto out; | |
414 | } | |
415 | ||
416 | if (divas_um_idi_delete_entity | |
417 | ((int) adapter_nr, file->private_data)) { | |
418 | ret = -ENODEV; | |
419 | goto out; | |
420 | } | |
421 | ||
475be4d8 | 422 | out: |
1da177e4 LT |
423 | return (ret); |
424 | } | |
425 | ||
426 | int diva_os_get_context_size(void) | |
427 | { | |
428 | return (sizeof(diva_um_idi_os_context_t)); | |
429 | } | |
430 | ||
431 | void diva_os_wakeup_read(void *os_context) | |
432 | { | |
433 | diva_um_idi_os_context_t *p_os = | |
475be4d8 | 434 | (diva_um_idi_os_context_t *) os_context; |
1da177e4 LT |
435 | wake_up_interruptible(&p_os->read_wait); |
436 | } | |
437 | ||
438 | void diva_os_wakeup_close(void *os_context) | |
439 | { | |
440 | diva_um_idi_os_context_t *p_os = | |
475be4d8 | 441 | (diva_um_idi_os_context_t *) os_context; |
1da177e4 LT |
442 | wake_up_interruptible(&p_os->close_wait); |
443 | } | |
444 | ||
445 | static | |
e99e88a9 | 446 | void diva_um_timer_function(struct timer_list *t) |
1da177e4 | 447 | { |
e99e88a9 | 448 | diva_um_idi_os_context_t *p_os = from_timer(p_os, t, diva_timer_id); |
1da177e4 LT |
449 | |
450 | p_os->aborted = 1; | |
451 | wake_up_interruptible(&p_os->read_wait); | |
452 | wake_up_interruptible(&p_os->close_wait); | |
453 | DBG_ERR(("entity removal watchdog")) | |
475be4d8 | 454 | } |
1da177e4 LT |
455 | |
456 | /* | |
457 | ** If application exits without entity removal this function will remove | |
458 | ** entity and block until removal is complete | |
459 | */ | |
460 | static int remove_entity(void *entity) | |
461 | { | |
462 | struct task_struct *curtask = current; | |
463 | diva_um_idi_os_context_t *p_os; | |
464 | ||
465 | diva_um_idi_stop_wdog(entity); | |
466 | ||
467 | if (!entity) { | |
468 | DBG_FTL(("Zero entity on remove")) | |
475be4d8 | 469 | return (0); |
1da177e4 LT |
470 | } |
471 | ||
472 | if (!(p_os = | |
475be4d8 JP |
473 | (diva_um_idi_os_context_t *) |
474 | diva_um_id_get_os_context(entity))) { | |
1da177e4 | 475 | DBG_FTL(("Zero entity os context on remove")) |
475be4d8 | 476 | return (0); |
1da177e4 LT |
477 | } |
478 | ||
479 | if (!divas_um_idi_entity_assigned(entity) || p_os->aborted) { | |
480 | /* | |
475be4d8 JP |
481 | Entity is not assigned, also can be removed |
482 | */ | |
1da177e4 LT |
483 | return (0); |
484 | } | |
485 | ||
486 | DBG_TRC(("E(%08x) check remove", entity)) | |
487 | ||
475be4d8 JP |
488 | /* |
489 | If adapter not answers on remove request inside of | |
490 | 10 Sec, then adapter is dead | |
491 | */ | |
492 | diva_um_idi_start_wdog(entity); | |
1da177e4 LT |
493 | |
494 | { | |
495 | DECLARE_WAITQUEUE(wait, curtask); | |
496 | ||
497 | add_wait_queue(&p_os->close_wait, &wait); | |
498 | for (;;) { | |
499 | set_current_state(TASK_INTERRUPTIBLE); | |
500 | if (!divas_um_idi_entity_start_remove(entity) | |
501 | || p_os->aborted) { | |
502 | break; | |
503 | } | |
504 | schedule(); | |
505 | } | |
506 | set_current_state(TASK_RUNNING); | |
507 | remove_wait_queue(&p_os->close_wait, &wait); | |
508 | } | |
509 | ||
510 | DBG_TRC(("E(%08x) start remove", entity)) | |
511 | { | |
512 | DECLARE_WAITQUEUE(wait, curtask); | |
513 | ||
514 | add_wait_queue(&p_os->close_wait, &wait); | |
515 | for (;;) { | |
516 | set_current_state(TASK_INTERRUPTIBLE); | |
517 | if (!divas_um_idi_entity_assigned(entity) | |
518 | || p_os->aborted) { | |
519 | break; | |
520 | } | |
521 | schedule(); | |
522 | } | |
523 | set_current_state(TASK_RUNNING); | |
524 | remove_wait_queue(&p_os->close_wait, &wait); | |
525 | } | |
526 | ||
527 | DBG_TRC(("E(%08x) remove complete, aborted:%d", entity, | |
528 | p_os->aborted)) | |
529 | ||
475be4d8 | 530 | diva_um_idi_stop_wdog(entity); |
1da177e4 LT |
531 | |
532 | p_os->aborted = 0; | |
533 | ||
534 | return (0); | |
535 | } | |
536 | ||
537 | /* | |
538 | * timer watchdog | |
539 | */ | |
540 | void diva_um_idi_start_wdog(void *entity) | |
541 | { | |
542 | diva_um_idi_os_context_t *p_os; | |
543 | ||
544 | if (entity && | |
545 | ((p_os = | |
546 | (diva_um_idi_os_context_t *) | |
547 | diva_um_id_get_os_context(entity)))) { | |
548 | mod_timer(&p_os->diva_timer_id, jiffies + 10 * HZ); | |
549 | } | |
550 | } | |
551 | ||
552 | void diva_um_idi_stop_wdog(void *entity) | |
553 | { | |
554 | diva_um_idi_os_context_t *p_os; | |
555 | ||
556 | if (entity && | |
557 | ((p_os = | |
558 | (diva_um_idi_os_context_t *) | |
559 | diva_um_id_get_os_context(entity)))) { | |
560 | del_timer(&p_os->diva_timer_id); | |
561 | } | |
562 | } |