summaryrefslogtreecommitdiff
path: root/drivers/isdn/hardware/eicon/divasi.c
blob: 69e71ebe7841830bf2af1dc68b894186b776cb91 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
/* $Id: divasi.c,v 1.25.6.2 2005/01/31 12:22:20 armin Exp $
 *
 * Driver for Eicon DIVA Server ISDN cards.
 * User Mode IDI Interface 
 *
 * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
 * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>

#include "platform.h"
#include "di_defs.h"
#include "divasync.h"
#include "um_xdi.h"
#include "um_idi.h"

static char *main_revision = "$Revision: 1.25.6.2 $";

static int major;

MODULE_DESCRIPTION("User IDI Interface for Eicon ISDN cards");
MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
MODULE_SUPPORTED_DEVICE("DIVA card driver");
MODULE_LICENSE("GPL");

typedef struct _diva_um_idi_os_context {
	wait_queue_head_t read_wait;
	wait_queue_head_t close_wait;
	struct timer_list diva_timer_id;
	int aborted;
	int adapter_nr;
} diva_um_idi_os_context_t;

static char *DRIVERNAME = "Eicon DIVA - User IDI (http://www.melware.net)";
static char *DRIVERLNAME = "diva_idi";
static char *DEVNAME = "DivasIDI";
char *DRIVERRELEASE_IDI = "2.0";

extern int idifunc_init(void);
extern void idifunc_finit(void);

/*
 *  helper functions
 */
static char *getrev(const char *revision)
{
	char *rev;
	char *p;
	if ((p = strchr(revision, ':'))) {
		rev = p + 2;
		p = strchr(rev, '$');
		*--p = 0;
	} else
		rev = "1.0";
	return rev;
}

/*
 *  LOCALS
 */
static ssize_t um_idi_read(struct file *file, char __user *buf, size_t count,
			   loff_t * offset);
static ssize_t um_idi_write(struct file *file, const char __user *buf,
			    size_t count, loff_t * offset);
static unsigned int um_idi_poll(struct file *file, poll_table * wait);
static int um_idi_open(struct inode *inode, struct file *file);
static int um_idi_release(struct inode *inode, struct file *file);
static int remove_entity(void *entity);
static void diva_um_timer_function(unsigned long data);

/*
 * proc entry
 */
extern struct proc_dir_entry *proc_net_eicon;
static struct proc_dir_entry *um_idi_proc_entry = NULL;

static int
um_idi_proc_read(char *page, char **start, off_t off, int count, int *eof,
		 void *data)
{
	int len = 0;
	char tmprev[32];

	len += sprintf(page + len, "%s\n", DRIVERNAME);
	len += sprintf(page + len, "name     : %s\n", DRIVERLNAME);
	len += sprintf(page + len, "release  : %s\n", DRIVERRELEASE_IDI);
	strcpy(tmprev, main_revision);
	len += sprintf(page + len, "revision : %s\n", getrev(tmprev));
	len += sprintf(page + len, "build    : %s\n", DIVA_BUILD);
	len += sprintf(page + len, "major    : %d\n", major);

	if (off + count >= len)
		*eof = 1;
	if (len < off)
		return 0;
	*start = page + off;
	return ((count < len - off) ? count : len - off);
}

static int DIVA_INIT_FUNCTION create_um_idi_proc(void)
{
	um_idi_proc_entry = create_proc_entry(DRIVERLNAME,
					      S_IFREG | S_IRUGO | S_IWUSR,
					      proc_net_eicon);
	if (!um_idi_proc_entry)
		return (0);

	um_idi_proc_entry->read_proc = um_idi_proc_read;

	return (1);
}

static void remove_um_idi_proc(void)
{
	if (um_idi_proc_entry) {
		remove_proc_entry(DRIVERLNAME, proc_net_eicon);
		um_idi_proc_entry = NULL;
	}
}

static const struct file_operations divas_idi_fops = {
	.owner   = THIS_MODULE,
	.llseek  = no_llseek,
	.read    = um_idi_read,
	.write   = um_idi_write,
	.poll    = um_idi_poll,
	.open    = um_idi_open,
	.release = um_idi_release
};

static void divas_idi_unregister_chrdev(void)
{
	unregister_chrdev(major, DEVNAME);
}

static int DIVA_INIT_FUNCTION divas_idi_register_chrdev(void)
{
	if ((major = register_chrdev(0, DEVNAME, &divas_idi_fops)) < 0)
	{
		printk(KERN_ERR "%s: failed to create /dev entry.\n",
		       DRIVERLNAME);
		return (0);
	}

	return (1);
}

/*
** Driver Load
*/
static int DIVA_INIT_FUNCTION divasi_init(void)
{
	char tmprev[50];
	int ret = 0;

	printk(KERN_INFO "%s\n", DRIVERNAME);
	printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_IDI);
	strcpy(tmprev, main_revision);
	printk("%s  Build: %s\n", getrev(tmprev), DIVA_BUILD);

	if (!divas_idi_register_chrdev()) {
		ret = -EIO;
		goto out;
	}

	if (!create_um_idi_proc()) {
		divas_idi_unregister_chrdev();
		printk(KERN_ERR "%s: failed to create proc entry.\n",
		       DRIVERLNAME);
		ret = -EIO;
		goto out;
	}

	if (!(idifunc_init())) {
		remove_um_idi_proc();
		divas_idi_unregister_chrdev();
		printk(KERN_ERR "%s: failed to connect to DIDD.\n",
		       DRIVERLNAME);
		ret = -EIO;
		goto out;
	}
	printk(KERN_INFO "%s: started with major %d\n", DRIVERLNAME, major);

      out:
	return (ret);
}


/*
** Driver Unload
*/
static void DIVA_EXIT_FUNCTION divasi_exit(void)
{
	idifunc_finit();
	remove_um_idi_proc();
	divas_idi_unregister_chrdev();

	printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
}

module_init(divasi_init);
module_exit(divasi_exit);


/*
 *  FILE OPERATIONS
 */

static int
divas_um_idi_copy_to_user(void *os_handle, void *dst, const void *src,
			  int length)
{
	memcpy(dst, src, length);
	return (length);
}

static ssize_t
um_idi_read(struct file *file, char __user *buf, size_t count, loff_t * offset)
{
	diva_um_idi_os_context_t *p_os;
	int ret = -EINVAL;
	void *data;

	if (!file->private_data) {
		return (-ENODEV);
	}

	if (!
	    (p_os =
	     (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->
								    private_data)))
	{
		return (-ENODEV);
	}
	if (p_os->aborted) {
		return (-ENODEV);
	}

	if (!(data = diva_os_malloc(0, count))) {
		return (-ENOMEM);
	}

	ret = diva_um_idi_read(file->private_data,
			       file, data, count,
			       divas_um_idi_copy_to_user);
	switch (ret) {
	case 0:		/* no message available */
		ret = (-EAGAIN);
		break;
	case (-1):		/* adapter was removed */
		ret = (-ENODEV);
		break;
	case (-2):		/* message_length > length of user buffer */
		ret = (-EFAULT);
		break;
	}

	if (ret > 0) {
		if (copy_to_user(buf, data, ret)) {
			ret = (-EFAULT);
		}
	}

	diva_os_free(0, data);
	DBG_TRC(("read: ret %d", ret));
	return (ret);
}


static int
divas_um_idi_copy_from_user(void *os_handle, void *dst, const void *src,
			    int length)
{
	memcpy(dst, src, length);
	return (length);
}

static int um_idi_open_adapter(struct file *file, int adapter_nr)
{
	diva_um_idi_os_context_t *p_os;
	void *e =
	    divas_um_idi_create_entity((dword) adapter_nr, (void *) file);

	if (!(file->private_data = e)) {
		return (0);
	}
	p_os = (diva_um_idi_os_context_t *) diva_um_id_get_os_context(e);
	init_waitqueue_head(&p_os->read_wait);
	init_waitqueue_head(&p_os->close_wait);
	init_timer(&p_os->diva_timer_id);
	p_os->diva_timer_id.function = (void *) diva_um_timer_function;
	p_os->diva_timer_id.data = (unsigned long) p_os;
	p_os->aborted = 0;
	p_os->adapter_nr = adapter_nr;
	return (1);
}

static ssize_t
um_idi_write(struct file *file, const char __user *buf, size_t count,
	     loff_t * offset)
{
	diva_um_idi_os_context_t *p_os;
	int ret = -EINVAL;
	void *data;
	int adapter_nr = 0;

	if (!file->private_data) {
		/* the first write() selects the adapter_nr */
		if (count == sizeof(int)) {
			if (copy_from_user
			    ((void *) &adapter_nr, buf,
			     count)) return (-EFAULT);
			if (!(um_idi_open_adapter(file, adapter_nr)))
				return (-ENODEV);
			return (count);
		} else
			return (-ENODEV);
	}

	if (!(p_os =
	     (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->
								    private_data)))
	{
		return (-ENODEV);
	}
	if (p_os->aborted) {
		return (-ENODEV);
	}

	if (!(data = diva_os_malloc(0, count))) {
		return (-ENOMEM);
	}

	if (copy_from_user(data, buf, count)) {
		ret = -EFAULT;
	} else {
		ret = diva_um_idi_write(file->private_data,
					file, data, count,
					divas_um_idi_copy_from_user);
		switch (ret) {
		case 0:	/* no space available */
			ret = (-EAGAIN);
			break;
		case (-1):	/* adapter was removed */
			ret = (-ENODEV);
			break;
		case (-2):	/* length of user buffer > max message_length */
			ret = (-EFAULT);
			break;
		}
	}
	diva_os_free(0, data);
	DBG_TRC(("write: ret %d", ret));
	return (ret);
}

static unsigned int um_idi_poll(struct file *file, poll_table * wait)
{
	diva_um_idi_os_context_t *p_os;

	if (!file->private_data) {
		return (POLLERR);
	}

	if ((!(p_os =
	       (diva_um_idi_os_context_t *)
	       diva_um_id_get_os_context(file->private_data)))
	    || p_os->aborted) {
		return (POLLERR);
	}

	poll_wait(file, &p_os->read_wait, wait);

	if (p_os->aborted) {
		return (POLLERR);
	}

	switch (diva_user_mode_idi_ind_ready(file->private_data, file)) {
	case (-1):
		return (POLLERR);

	case 0:
		return (0);
	}

	return (POLLIN | POLLRDNORM);
}

static int um_idi_open(struct inode *inode, struct file *file)
{
	cycle_kernel_lock();
	return (0);
}


static int um_idi_release(struct inode *inode, struct file *file)
{
	diva_um_idi_os_context_t *p_os;
	unsigned int adapter_nr;
	int ret = 0;

	if (!(file->private_data)) {
		ret = -ENODEV;
		goto out;
	}

	if (!(p_os =
		(diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->private_data))) {
		ret = -ENODEV;
		goto out;
	}

	adapter_nr = p_os->adapter_nr;

	if ((ret = remove_entity(file->private_data))) {
		goto out;
	}

	if (divas_um_idi_delete_entity
	    ((int) adapter_nr, file->private_data)) {
		ret = -ENODEV;
		goto out;
	}

      out:
	return (ret);
}

int diva_os_get_context_size(void)
{
	return (sizeof(diva_um_idi_os_context_t));
}

void diva_os_wakeup_read(void *os_context)
{
	diva_um_idi_os_context_t *p_os =
	    (diva_um_idi_os_context_t *) os_context;
	wake_up_interruptible(&p_os->read_wait);
}

void diva_os_wakeup_close(void *os_context)
{
	diva_um_idi_os_context_t *p_os =
	    (diva_um_idi_os_context_t *) os_context;
	wake_up_interruptible(&p_os->close_wait);
}

static
void diva_um_timer_function(unsigned long data)
{
	diva_um_idi_os_context_t *p_os = (diva_um_idi_os_context_t *) data;

	p_os->aborted = 1;
	wake_up_interruptible(&p_os->read_wait);
	wake_up_interruptible(&p_os->close_wait);
	DBG_ERR(("entity removal watchdog"))
}

/*
**  If application exits without entity removal this function will remove
**  entity and block until removal is complete
*/
static int remove_entity(void *entity)
{
	struct task_struct *curtask = current;
	diva_um_idi_os_context_t *p_os;

	diva_um_idi_stop_wdog(entity);

	if (!entity) {
		DBG_FTL(("Zero entity on remove"))
		return (0);
	}

	if (!(p_os =
	     (diva_um_idi_os_context_t *)
	     diva_um_id_get_os_context(entity))) {
		DBG_FTL(("Zero entity os context on remove"))
		return (0);
	}

	if (!divas_um_idi_entity_assigned(entity) || p_os->aborted) {
		/*
		   Entity is not assigned, also can be removed
		 */
		return (0);
	}

	DBG_TRC(("E(%08x) check remove", entity))

	/*
	   If adapter not answers on remove request inside of
	   10 Sec, then adapter is dead
	 */
	diva_um_idi_start_wdog(entity);

	{
		DECLARE_WAITQUEUE(wait, curtask);

		add_wait_queue(&p_os->close_wait, &wait);
		for (;;) {
			set_current_state(TASK_INTERRUPTIBLE);
			if (!divas_um_idi_entity_start_remove(entity)
			    || p_os->aborted) {
				break;
			}
			schedule();
		}
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&p_os->close_wait, &wait);
	}

	DBG_TRC(("E(%08x) start remove", entity))
	{
		DECLARE_WAITQUEUE(wait, curtask);

		add_wait_queue(&p_os->close_wait, &wait);
		for (;;) {
			set_current_state(TASK_INTERRUPTIBLE);
			if (!divas_um_idi_entity_assigned(entity)
			    || p_os->aborted) {
				break;
			}
			schedule();
		}
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&p_os->close_wait, &wait);
	}

	DBG_TRC(("E(%08x) remove complete, aborted:%d", entity,
		 p_os->aborted))

	diva_um_idi_stop_wdog(entity);

	p_os->aborted = 0;

	return (0);
}

/*
 * timer watchdog
 */
void diva_um_idi_start_wdog(void *entity)
{
	diva_um_idi_os_context_t *p_os;

	if (entity &&
	    ((p_os =
	      (diva_um_idi_os_context_t *)
	      diva_um_id_get_os_context(entity)))) {
		mod_timer(&p_os->diva_timer_id, jiffies + 10 * HZ);
	}
}

void diva_um_idi_stop_wdog(void *entity)
{
	diva_um_idi_os_context_t *p_os;

	if (entity &&
	    ((p_os =
	      (diva_um_idi_os_context_t *)
	      diva_um_id_get_os_context(entity)))) {
		del_timer(&p_os->diva_timer_id);
	}
}