Free Electrons

Embedded Linux Experts

  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
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
/* $Id: divasmain.c,v 1.55.4.6 2005/02/09 19:28:20 armin Exp $
 *
 * Low level driver for Eicon DIVA Server ISDN cards.
 *
 * 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/uaccess.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/poll.h>
#include <linux/kmod.h>

#include "platform.h"
#undef ID_MASK
#undef N_DATA
#include "pc.h"
#include "di_defs.h"
#include "divasync.h"
#include "diva.h"
#include "di.h"
#include "io.h"
#include "xdi_msg.h"
#include "xdi_adapter.h"
#include "xdi_vers.h"
#include "diva_dma.h"
#include "diva_pci.h"

static char *main_revision = "$Revision: 1.55.4.6 $";

static int major;

static int dbgmask;

MODULE_DESCRIPTION("Kernel driver for Eicon DIVA Server cards");
MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
MODULE_LICENSE("GPL");

module_param(dbgmask, int, 0);
MODULE_PARM_DESC(dbgmask, "initial debug mask");

static char *DRIVERNAME =
	"Eicon DIVA Server driver (http://www.melware.net)";
static char *DRIVERLNAME = "divas";
static char *DEVNAME = "Divas";
char *DRIVERRELEASE_DIVAS = "2.0";

extern irqreturn_t diva_os_irq_wrapper(int irq, void *context);
extern int create_divas_proc(void);
extern void remove_divas_proc(void);
extern void diva_get_vserial_number(PISDN_ADAPTER IoAdapter, char *buf);
extern int divasfunc_init(int dbgmask);
extern void divasfunc_exit(void);

typedef struct _diva_os_thread_dpc {
	struct tasklet_struct divas_task;
	diva_os_soft_isr_t *psoft_isr;
} diva_os_thread_dpc_t;

/* --------------------------------------------------------------------------
   PCI driver interface section
   -------------------------------------------------------------------------- */
/*
  vendor, device	Vendor and device ID to match (or PCI_ANY_ID)
  subvendor,	Subsystem vendor and device ID to match (or PCI_ANY_ID)
  subdevice
  class,		Device class to match. The class_mask tells which bits
  class_mask	of the class are honored during the comparison.
  driver_data	Data private to the driver.
*/

#if !defined(PCI_DEVICE_ID_EICON_MAESTRAP_2)
#define PCI_DEVICE_ID_EICON_MAESTRAP_2       0xE015
#endif

#if !defined(PCI_DEVICE_ID_EICON_4BRI_VOIP)
#define PCI_DEVICE_ID_EICON_4BRI_VOIP        0xE016
#endif

#if !defined(PCI_DEVICE_ID_EICON_4BRI_2_VOIP)
#define PCI_DEVICE_ID_EICON_4BRI_2_VOIP      0xE017
#endif

#if !defined(PCI_DEVICE_ID_EICON_BRI2M_2)
#define PCI_DEVICE_ID_EICON_BRI2M_2          0xE018
#endif

#if !defined(PCI_DEVICE_ID_EICON_MAESTRAP_2_VOIP)
#define PCI_DEVICE_ID_EICON_MAESTRAP_2_VOIP  0xE019
#endif

#if !defined(PCI_DEVICE_ID_EICON_2F)
#define PCI_DEVICE_ID_EICON_2F               0xE01A
#endif

#if !defined(PCI_DEVICE_ID_EICON_BRI2M_2_VOIP)
#define PCI_DEVICE_ID_EICON_BRI2M_2_VOIP     0xE01B
#endif

/*
  This table should be sorted by PCI device ID
*/
static const struct pci_device_id divas_pci_tbl[] = {
	/* Diva Server BRI-2M PCI 0xE010 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_MAESTRA),
	  CARDTYPE_MAESTRA_PCI },
	/* Diva Server 4BRI-8M PCI 0xE012 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_MAESTRAQ),
	  CARDTYPE_DIVASRV_Q_8M_PCI },
	/* Diva Server 4BRI-8M 2.0 PCI 0xE013 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_MAESTRAQ_U),
	  CARDTYPE_DIVASRV_Q_8M_V2_PCI },
	/* Diva Server PRI-30M PCI 0xE014 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_MAESTRAP),
	  CARDTYPE_DIVASRV_P_30M_PCI },
	/* Diva Server PRI 2.0 adapter 0xE015 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_MAESTRAP_2),
	  CARDTYPE_DIVASRV_P_30M_V2_PCI },
	/* Diva Server Voice 4BRI-8M PCI 0xE016 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_4BRI_VOIP),
	  CARDTYPE_DIVASRV_VOICE_Q_8M_PCI },
	/* Diva Server Voice 4BRI-8M 2.0 PCI 0xE017 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_4BRI_2_VOIP),
	  CARDTYPE_DIVASRV_VOICE_Q_8M_V2_PCI },
	/* Diva Server BRI-2M 2.0 PCI 0xE018 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_BRI2M_2),
	  CARDTYPE_DIVASRV_B_2M_V2_PCI },
	/* Diva Server Voice PRI 2.0 PCI 0xE019 */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_MAESTRAP_2_VOIP),
	  CARDTYPE_DIVASRV_VOICE_P_30M_V2_PCI },
	/* Diva Server 2FX 0xE01A */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_2F),
	  CARDTYPE_DIVASRV_B_2F_PCI },
	/* Diva Server Voice BRI-2M 2.0 PCI 0xE01B */
	{ PCI_VDEVICE(EICON, PCI_DEVICE_ID_EICON_BRI2M_2_VOIP),
	  CARDTYPE_DIVASRV_VOICE_B_2M_V2_PCI },
	{ 0, }			/* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, divas_pci_tbl);

static int divas_init_one(struct pci_dev *pdev,
			  const struct pci_device_id *ent);
static void divas_remove_one(struct pci_dev *pdev);

static struct pci_driver diva_pci_driver = {
	.name     = "divas",
	.probe    = divas_init_one,
	.remove   = divas_remove_one,
	.id_table = divas_pci_tbl,
};

/*********************************************************
 ** little 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;
}

void diva_log_info(unsigned char *format, ...)
{
	va_list args;
	unsigned char line[160];

	va_start(args, format);
	vsnprintf(line, sizeof(line), format, args);
	va_end(args);

	printk(KERN_INFO "%s: %s\n", DRIVERLNAME, line);
}

void divas_get_version(char *p)
{
	char tmprev[32];

	strcpy(tmprev, main_revision);
	sprintf(p, "%s: %s(%s) %s(%s) major=%d\n", DRIVERLNAME, DRIVERRELEASE_DIVAS,
		getrev(tmprev), diva_xdi_common_code_build, DIVA_BUILD, major);
}

/* --------------------------------------------------------------------------
   PCI Bus services
   -------------------------------------------------------------------------- */
byte diva_os_get_pci_bus(void *pci_dev_handle)
{
	struct pci_dev *pdev = (struct pci_dev *) pci_dev_handle;
	return ((byte) pdev->bus->number);
}

byte diva_os_get_pci_func(void *pci_dev_handle)
{
	struct pci_dev *pdev = (struct pci_dev *) pci_dev_handle;
	return ((byte) pdev->devfn);
}

unsigned long divasa_get_pci_irq(unsigned char bus, unsigned char func,
				 void *pci_dev_handle)
{
	unsigned char irq = 0;
	struct pci_dev *dev = (struct pci_dev *) pci_dev_handle;

	irq = dev->irq;

	return ((unsigned long) irq);
}

unsigned long divasa_get_pci_bar(unsigned char bus, unsigned char func,
				 int bar, void *pci_dev_handle)
{
	unsigned long ret = 0;
	struct pci_dev *dev = (struct pci_dev *) pci_dev_handle;

	if (bar < 6) {
		ret = dev->resource[bar].start;
	}

	DBG_TRC(("GOT BAR[%d]=%08x", bar, ret));

	{
		unsigned long type = (ret & 0x00000001);
		if (type & PCI_BASE_ADDRESS_SPACE_IO) {
			DBG_TRC(("  I/O"));
			ret &= PCI_BASE_ADDRESS_IO_MASK;
		} else {
			DBG_TRC(("  memory"));
			ret &= PCI_BASE_ADDRESS_MEM_MASK;
		}
		DBG_TRC(("  final=%08x", ret));
	}

	return (ret);
}

void PCIwrite(byte bus, byte func, int offset, void *data, int length,
	      void *pci_dev_handle)
{
	struct pci_dev *dev = (struct pci_dev *) pci_dev_handle;

	switch (length) {
	case 1:		/* byte */
		pci_write_config_byte(dev, offset,
				      *(unsigned char *) data);
		break;
	case 2:		/* word */
		pci_write_config_word(dev, offset,
				      *(unsigned short *) data);
		break;
	case 4:		/* dword */
		pci_write_config_dword(dev, offset,
				       *(unsigned int *) data);
		break;

	default:		/* buffer */
		if (!(length % 4) && !(length & 0x03)) {	/* Copy as dword */
			dword *p = (dword *) data;
			length /= 4;

			while (length--) {
				pci_write_config_dword(dev, offset,
						       *(unsigned int *)
						       p++);
			}
		} else {	/* copy as byte stream */
			byte *p = (byte *) data;

			while (length--) {
				pci_write_config_byte(dev, offset,
						      *(unsigned char *)
						      p++);
			}
		}
	}
}

void PCIread(byte bus, byte func, int offset, void *data, int length,
	     void *pci_dev_handle)
{
	struct pci_dev *dev = (struct pci_dev *) pci_dev_handle;

	switch (length) {
	case 1:		/* byte */
		pci_read_config_byte(dev, offset, (unsigned char *) data);
		break;
	case 2:		/* word */
		pci_read_config_word(dev, offset, (unsigned short *) data);
		break;
	case 4:		/* dword */
		pci_read_config_dword(dev, offset, (unsigned int *) data);
		break;

	default:		/* buffer */
		if (!(length % 4) && !(length & 0x03)) {	/* Copy as dword */
			dword *p = (dword *) data;
			length /= 4;

			while (length--) {
				pci_read_config_dword(dev, offset,
						      (unsigned int *)
						      p++);
			}
		} else {	/* copy as byte stream */
			byte *p = (byte *) data;

			while (length--) {
				pci_read_config_byte(dev, offset,
						     (unsigned char *)
						     p++);
			}
		}
	}
}

/*
  Init map with DMA pages. It is not problem if some allocations fail -
  the channels that will not get one DMA page will use standard PIO
  interface
*/
static void *diva_pci_alloc_consistent(struct pci_dev *hwdev,
				       size_t size,
				       dma_addr_t *dma_handle,
				       void **addr_handle)
{
	void *addr = pci_alloc_consistent(hwdev, size, dma_handle);

	*addr_handle = addr;

	return (addr);
}

void diva_init_dma_map(void *hdev,
		       struct _diva_dma_map_entry **ppmap, int nentries)
{
	struct pci_dev *pdev = (struct pci_dev *) hdev;
	struct _diva_dma_map_entry *pmap =
		diva_alloc_dma_map(hdev, nentries);

	if (pmap) {
		int i;
		dma_addr_t dma_handle;
		void *cpu_addr;
		void *addr_handle;

		for (i = 0; i < nentries; i++) {
			if (!(cpu_addr = diva_pci_alloc_consistent(pdev,
								   PAGE_SIZE,
								   &dma_handle,
								   &addr_handle)))
			{
				break;
			}
			diva_init_dma_map_entry(pmap, i, cpu_addr,
						(dword) dma_handle,
						addr_handle);
			DBG_TRC(("dma map alloc [%d]=(%08lx:%08x:%08lx)",
				 i, (unsigned long) cpu_addr,
				 (dword) dma_handle,
				 (unsigned long) addr_handle))}
	}

	*ppmap = pmap;
}

/*
  Free all contained in the map entries and memory used by the map
  Should be always called after adapter removal from DIDD array
*/
void diva_free_dma_map(void *hdev, struct _diva_dma_map_entry *pmap)
{
	struct pci_dev *pdev = (struct pci_dev *) hdev;
	int i;
	dword phys_addr;
	void *cpu_addr;
	dma_addr_t dma_handle;
	void *addr_handle;

	for (i = 0; (pmap != NULL); i++) {
		diva_get_dma_map_entry(pmap, i, &cpu_addr, &phys_addr);
		if (!cpu_addr) {
			break;
		}
		addr_handle = diva_get_entry_handle(pmap, i);
		dma_handle = (dma_addr_t) phys_addr;
		pci_free_consistent(pdev, PAGE_SIZE, addr_handle,
				    dma_handle);
		DBG_TRC(("dma map free [%d]=(%08lx:%08x:%08lx)", i,
			 (unsigned long) cpu_addr, (dword) dma_handle,
			 (unsigned long) addr_handle))
			}

	diva_free_dma_mapping(pmap);
}


/*********************************************************
 ** I/O port utilities
 *********************************************************/

int
diva_os_register_io_port(void *adapter, int on, unsigned long port,
			 unsigned long length, const char *name, int id)
{
	if (on) {
		if (!request_region(port, length, name)) {
			DBG_ERR(("A: I/O: can't register port=%08x", port))
				return (-1);
		}
	} else {
		release_region(port, length);
	}
	return (0);
}

void __iomem *divasa_remap_pci_bar(diva_os_xdi_adapter_t *a, int id, unsigned long bar, unsigned long area_length)
{
	void __iomem *ret = ioremap(bar, area_length);
	DBG_TRC(("remap(%08x)->%p", bar, ret));
	return (ret);
}

void divasa_unmap_pci_bar(void __iomem *bar)
{
	if (bar) {
		iounmap(bar);
	}
}

/*********************************************************
 ** I/O port access
 *********************************************************/
inline byte inpp(void __iomem *addr)
{
	return (inb((unsigned long) addr));
}

inline word inppw(void __iomem *addr)
{
	return (inw((unsigned long) addr));
}

inline void inppw_buffer(void __iomem *addr, void *P, int length)
{
	insw((unsigned long) addr, (word *) P, length >> 1);
}

inline void outppw_buffer(void __iomem *addr, void *P, int length)
{
	outsw((unsigned long) addr, (word *) P, length >> 1);
}

inline void outppw(void __iomem *addr, word w)
{
	outw(w, (unsigned long) addr);
}

inline void outpp(void __iomem *addr, word p)
{
	outb(p, (unsigned long) addr);
}

/* --------------------------------------------------------------------------
   IRQ request / remove
   -------------------------------------------------------------------------- */
int diva_os_register_irq(void *context, byte irq, const char *name)
{
	int result = request_irq(irq, diva_os_irq_wrapper,
				 IRQF_SHARED, name, context);
	return (result);
}

void diva_os_remove_irq(void *context, byte irq)
{
	free_irq(irq, context);
}

/* --------------------------------------------------------------------------
   DPC framework implementation
   -------------------------------------------------------------------------- */
static void diva_os_dpc_proc(unsigned long context)
{
	diva_os_thread_dpc_t *psoft_isr = (diva_os_thread_dpc_t *) context;
	diva_os_soft_isr_t *pisr = psoft_isr->psoft_isr;

	(*(pisr->callback)) (pisr, pisr->callback_context);
}

int diva_os_initialize_soft_isr(diva_os_soft_isr_t *psoft_isr,
				diva_os_soft_isr_callback_t callback,
				void *callback_context)
{
	diva_os_thread_dpc_t *pdpc;

	pdpc = (diva_os_thread_dpc_t *) diva_os_malloc(0, sizeof(*pdpc));
	if (!(psoft_isr->object = pdpc)) {
		return (-1);
	}
	memset(pdpc, 0x00, sizeof(*pdpc));
	psoft_isr->callback = callback;
	psoft_isr->callback_context = callback_context;
	pdpc->psoft_isr = psoft_isr;
	tasklet_init(&pdpc->divas_task, diva_os_dpc_proc, (unsigned long)pdpc);

	return (0);
}

int diva_os_schedule_soft_isr(diva_os_soft_isr_t *psoft_isr)
{
	if (psoft_isr && psoft_isr->object) {
		diva_os_thread_dpc_t *pdpc =
			(diva_os_thread_dpc_t *) psoft_isr->object;

		tasklet_schedule(&pdpc->divas_task);
	}

	return (1);
}

int diva_os_cancel_soft_isr(diva_os_soft_isr_t *psoft_isr)
{
	return (0);
}

void diva_os_remove_soft_isr(diva_os_soft_isr_t *psoft_isr)
{
	if (psoft_isr && psoft_isr->object) {
		diva_os_thread_dpc_t *pdpc =
			(diva_os_thread_dpc_t *) psoft_isr->object;
		void *mem;

		tasklet_kill(&pdpc->divas_task);
		mem = psoft_isr->object;
		psoft_isr->object = NULL;
		diva_os_free(0, mem);
	}
}

/*
 * kernel/user space copy functions
 */
static int
xdi_copy_to_user(void *os_handle, void __user *dst, const void *src, int length)
{
	if (copy_to_user(dst, src, length)) {
		return (-EFAULT);
	}
	return (length);
}

static int
xdi_copy_from_user(void *os_handle, void *dst, const void __user *src, int length)
{
	if (copy_from_user(dst, src, length)) {
		return (-EFAULT);
	}
	return (length);
}

/*
 * device node operations
 */
static int divas_open(struct inode *inode, struct file *file)
{
	return (0);
}

static int divas_release(struct inode *inode, struct file *file)
{
	if (file->private_data) {
		diva_xdi_close_adapter(file->private_data, file);
	}
	return (0);
}

static ssize_t divas_write(struct file *file, const char __user *buf,
			   size_t count, loff_t *ppos)
{
	int ret = -EINVAL;

	if (!file->private_data) {
		file->private_data = diva_xdi_open_adapter(file, buf,
							   count,
							   xdi_copy_from_user);
	}
	if (!file->private_data) {
		return (-ENODEV);
	}

	ret = diva_xdi_write(file->private_data, file,
			     buf, count, xdi_copy_from_user);
	switch (ret) {
	case -1:		/* Message should be removed from rx mailbox first */
		ret = -EBUSY;
		break;
	case -2:		/* invalid adapter was specified in this call */
		ret = -ENOMEM;
		break;
	case -3:
		ret = -ENXIO;
		break;
	}
	DBG_TRC(("write: ret %d", ret));
	return (ret);
}

static ssize_t divas_read(struct file *file, char __user *buf,
			  size_t count, loff_t *ppos)
{
	int ret = -EINVAL;

	if (!file->private_data) {
		file->private_data = diva_xdi_open_adapter(file, buf,
							   count,
							   xdi_copy_from_user);
	}
	if (!file->private_data) {
		return (-ENODEV);
	}

	ret = diva_xdi_read(file->private_data, file,
			    buf, count, xdi_copy_to_user);
	switch (ret) {
	case -1:		/* RX mailbox is empty */
		ret = -EAGAIN;
		break;
	case -2:		/* no memory, mailbox was cleared, last command is failed */
		ret = -ENOMEM;
		break;
	case -3:		/* can't copy to user, retry */
		ret = -EFAULT;
		break;
	}
	DBG_TRC(("read: ret %d", ret));
	return (ret);
}

static unsigned int divas_poll(struct file *file, poll_table *wait)
{
	if (!file->private_data) {
		return (POLLERR);
	}
	return (POLLIN | POLLRDNORM);
}

static const struct file_operations divas_fops = {
	.owner   = THIS_MODULE,
	.llseek  = no_llseek,
	.read    = divas_read,
	.write   = divas_write,
	.poll    = divas_poll,
	.open    = divas_open,
	.release = divas_release
};

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

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

	return (1);
}

/* --------------------------------------------------------------------------
   PCI driver section
   -------------------------------------------------------------------------- */
static int divas_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	void *pdiva = NULL;
	u8 pci_latency;
	u8 new_latency = 32;

	DBG_TRC(("%s bus: %08x fn: %08x insertion.\n",
		 CardProperties[ent->driver_data].Name,
		 pdev->bus->number, pdev->devfn))
		printk(KERN_INFO "%s: %s bus: %08x fn: %08x insertion.\n",
		       DRIVERLNAME, CardProperties[ent->driver_data].Name,
		       pdev->bus->number, pdev->devfn);

	if (pci_enable_device(pdev)) {
		DBG_TRC(("%s: %s bus: %08x fn: %08x device init failed.\n",
			 DRIVERLNAME,
			 CardProperties[ent->driver_data].Name,
			 pdev->bus->number,
			 pdev->devfn))
			printk(KERN_ERR
			       "%s: %s bus: %08x fn: %08x device init failed.\n",
			       DRIVERLNAME,
			       CardProperties[ent->driver_data].
			       Name, pdev->bus->number,
			       pdev->devfn);
		return (-EIO);
	}

	pci_set_master(pdev);

	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &pci_latency);
	if (!pci_latency) {
		DBG_TRC(("%s: bus: %08x fn: %08x fix latency.\n",
			 DRIVERLNAME, pdev->bus->number, pdev->devfn))
			printk(KERN_INFO
			       "%s: bus: %08x fn: %08x fix latency.\n",
			       DRIVERLNAME, pdev->bus->number, pdev->devfn);
		pci_write_config_byte(pdev, PCI_LATENCY_TIMER, new_latency);
	}

	if (!(pdiva = diva_driver_add_card(pdev, ent->driver_data))) {
		DBG_TRC(("%s: %s bus: %08x fn: %08x card init failed.\n",
			 DRIVERLNAME,
			 CardProperties[ent->driver_data].Name,
			 pdev->bus->number,
			 pdev->devfn))
			printk(KERN_ERR
			       "%s: %s bus: %08x fn: %08x card init failed.\n",
			       DRIVERLNAME,
			       CardProperties[ent->driver_data].
			       Name, pdev->bus->number,
			       pdev->devfn);
		return (-EIO);
	}

	pci_set_drvdata(pdev, pdiva);

	return (0);
}

static void divas_remove_one(struct pci_dev *pdev)
{
	void *pdiva = pci_get_drvdata(pdev);

	DBG_TRC(("bus: %08x fn: %08x removal.\n",
		 pdev->bus->number, pdev->devfn))
		printk(KERN_INFO "%s: bus: %08x fn: %08x removal.\n",
		       DRIVERLNAME, pdev->bus->number, pdev->devfn);

	if (pdiva) {
		diva_driver_remove_card(pdiva);
	}

}

/* --------------------------------------------------------------------------
   Driver Load / Startup
   -------------------------------------------------------------------------- */
static int __init divas_init(void)
{
	char tmprev[50];
	int ret = 0;

	printk(KERN_INFO "%s\n", DRIVERNAME);
	printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_DIVAS);
	strcpy(tmprev, main_revision);
	printk("%s  Build: %s(%s)\n", getrev(tmprev),
	       diva_xdi_common_code_build, DIVA_BUILD);
	printk(KERN_INFO "%s: support for: ", DRIVERLNAME);
#ifdef CONFIG_ISDN_DIVAS_BRIPCI
	printk("BRI/PCI ");
#endif
#ifdef CONFIG_ISDN_DIVAS_PRIPCI
	printk("PRI/PCI ");
#endif
	printk("adapters\n");

	if (!divasfunc_init(dbgmask)) {
		printk(KERN_ERR "%s: failed to connect to DIDD.\n",
		       DRIVERLNAME);
		ret = -EIO;
		goto out;
	}

	if (!divas_register_chrdev()) {
#ifdef MODULE
		divasfunc_exit();
#endif
		ret = -EIO;
		goto out;
	}

	if (!create_divas_proc()) {
#ifdef MODULE
		divas_unregister_chrdev();
		divasfunc_exit();
#endif
		printk(KERN_ERR "%s: failed to create proc entry.\n",
		       DRIVERLNAME);
		ret = -EIO;
		goto out;
	}

	if ((ret = pci_register_driver(&diva_pci_driver))) {
#ifdef MODULE
		remove_divas_proc();
		divas_unregister_chrdev();
		divasfunc_exit();
#endif
		printk(KERN_ERR "%s: failed to init pci driver.\n",
		       DRIVERLNAME);
		goto out;
	}
	printk(KERN_INFO "%s: started with major %d\n", DRIVERLNAME, major);

out:
	return (ret);
}

/* --------------------------------------------------------------------------
   Driver Unload
   -------------------------------------------------------------------------- */
static void __exit divas_exit(void)
{
	pci_unregister_driver(&diva_pci_driver);
	remove_divas_proc();
	divas_unregister_chrdev();
	divasfunc_exit();

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

module_init(divas_init);
module_exit(divas_exit);