summaryrefslogtreecommitdiff
path: root/drivers/firewire/nosy.c
blob: fee2e9e7ea20a8adb1d82e108a7ee96ff984842a (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
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
/*
 * nosy - Snoop mode driver for TI PCILynx 1394 controllers
 * Copyright (C) 2002-2007 Kristian Høgsberg
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/sched.h> /* required for linux/wait.h */
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/time64.h>
#include <linux/timex.h>
#include <linux/uaccess.h>
#include <linux/wait.h>
#include <linux/dma-mapping.h>
#include <linux/atomic.h>
#include <asm/byteorder.h>

#include "nosy.h"
#include "nosy-user.h"

#define TCODE_PHY_PACKET		0x10
#define PCI_DEVICE_ID_TI_PCILYNX	0x8000

static char driver_name[] = KBUILD_MODNAME;

/* this is the physical layout of a PCL, its size is 128 bytes */
struct pcl {
	__le32 next;
	__le32 async_error_next;
	u32 user_data;
	__le32 pcl_status;
	__le32 remaining_transfer_count;
	__le32 next_data_buffer;
	struct {
		__le32 control;
		__le32 pointer;
	} buffer[13];
};

struct packet {
	unsigned int length;
	char data[0];
};

struct packet_buffer {
	char *data;
	size_t capacity;
	long total_packet_count, lost_packet_count;
	atomic_t size;
	struct packet *head, *tail;
	wait_queue_head_t wait;
};

struct pcilynx {
	struct pci_dev *pci_device;
	__iomem char *registers;

	struct pcl *rcv_start_pcl, *rcv_pcl;
	__le32 *rcv_buffer;

	dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;

	spinlock_t client_list_lock;
	struct list_head client_list;

	struct miscdevice misc;
	struct list_head link;
	struct kref kref;
};

static inline struct pcilynx *
lynx_get(struct pcilynx *lynx)
{
	kref_get(&lynx->kref);

	return lynx;
}

static void
lynx_release(struct kref *kref)
{
	kfree(container_of(kref, struct pcilynx, kref));
}

static inline void
lynx_put(struct pcilynx *lynx)
{
	kref_put(&lynx->kref, lynx_release);
}

struct client {
	struct pcilynx *lynx;
	u32 tcode_mask;
	struct packet_buffer buffer;
	struct list_head link;
};

static DEFINE_MUTEX(card_mutex);
static LIST_HEAD(card_list);

static int
packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
{
	buffer->data = kmalloc(capacity, GFP_KERNEL);
	if (buffer->data == NULL)
		return -ENOMEM;
	buffer->head = (struct packet *) buffer->data;
	buffer->tail = (struct packet *) buffer->data;
	buffer->capacity = capacity;
	buffer->lost_packet_count = 0;
	atomic_set(&buffer->size, 0);
	init_waitqueue_head(&buffer->wait);

	return 0;
}

static void
packet_buffer_destroy(struct packet_buffer *buffer)
{
	kfree(buffer->data);
}

static int
packet_buffer_get(struct client *client, char __user *data, size_t user_length)
{
	struct packet_buffer *buffer = &client->buffer;
	size_t length;
	char *end;

	if (wait_event_interruptible(buffer->wait,
				     atomic_read(&buffer->size) > 0) ||
				     list_empty(&client->lynx->link))
		return -ERESTARTSYS;

	if (atomic_read(&buffer->size) == 0)
		return -ENODEV;

	/* FIXME: Check length <= user_length. */

	end = buffer->data + buffer->capacity;
	length = buffer->head->length;

	if (&buffer->head->data[length] < end) {
		if (copy_to_user(data, buffer->head->data, length))
			return -EFAULT;
		buffer->head = (struct packet *) &buffer->head->data[length];
	} else {
		size_t split = end - buffer->head->data;

		if (copy_to_user(data, buffer->head->data, split))
			return -EFAULT;
		if (copy_to_user(data + split, buffer->data, length - split))
			return -EFAULT;
		buffer->head = (struct packet *) &buffer->data[length - split];
	}

	/*
	 * Decrease buffer->size as the last thing, since this is what
	 * keeps the interrupt from overwriting the packet we are
	 * retrieving from the buffer.
	 */
	atomic_sub(sizeof(struct packet) + length, &buffer->size);

	return length;
}

static void
packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
{
	char *end;

	buffer->total_packet_count++;

	if (buffer->capacity <
	    atomic_read(&buffer->size) + sizeof(struct packet) + length) {
		buffer->lost_packet_count++;
		return;
	}

	end = buffer->data + buffer->capacity;
	buffer->tail->length = length;

	if (&buffer->tail->data[length] < end) {
		memcpy(buffer->tail->data, data, length);
		buffer->tail = (struct packet *) &buffer->tail->data[length];
	} else {
		size_t split = end - buffer->tail->data;

		memcpy(buffer->tail->data, data, split);
		memcpy(buffer->data, data + split, length - split);
		buffer->tail = (struct packet *) &buffer->data[length - split];
	}

	/* Finally, adjust buffer size and wake up userspace reader. */

	atomic_add(sizeof(struct packet) + length, &buffer->size);
	wake_up_interruptible(&buffer->wait);
}

static inline void
reg_write(struct pcilynx *lynx, int offset, u32 data)
{
	writel(data, lynx->registers + offset);
}

static inline u32
reg_read(struct pcilynx *lynx, int offset)
{
	return readl(lynx->registers + offset);
}

static inline void
reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
{
	reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
}

/*
 * Maybe the pcl programs could be set up to just append data instead
 * of using a whole packet.
 */
static inline void
run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
			   int dmachan)
{
	reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
	reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
		  DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
}

static int
set_phy_reg(struct pcilynx *lynx, int addr, int val)
{
	if (addr > 15) {
		dev_err(&lynx->pci_device->dev,
			"PHY register address %d out of range\n", addr);
		return -1;
	}
	if (val > 0xff) {
		dev_err(&lynx->pci_device->dev,
			"PHY register value %d out of range\n", val);
		return -1;
	}
	reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
		  LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));

	return 0;
}

static int
nosy_open(struct inode *inode, struct file *file)
{
	int minor = iminor(inode);
	struct client *client;
	struct pcilynx *tmp, *lynx = NULL;

	mutex_lock(&card_mutex);
	list_for_each_entry(tmp, &card_list, link)
		if (tmp->misc.minor == minor) {
			lynx = lynx_get(tmp);
			break;
		}
	mutex_unlock(&card_mutex);
	if (lynx == NULL)
		return -ENODEV;

	client = kmalloc(sizeof *client, GFP_KERNEL);
	if (client == NULL)
		goto fail;

	client->tcode_mask = ~0;
	client->lynx = lynx;
	INIT_LIST_HEAD(&client->link);

	if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
		goto fail;

	file->private_data = client;

	return nonseekable_open(inode, file);
fail:
	kfree(client);
	lynx_put(lynx);

	return -ENOMEM;
}

static int
nosy_release(struct inode *inode, struct file *file)
{
	struct client *client = file->private_data;
	struct pcilynx *lynx = client->lynx;

	spin_lock_irq(&lynx->client_list_lock);
	list_del_init(&client->link);
	spin_unlock_irq(&lynx->client_list_lock);

	packet_buffer_destroy(&client->buffer);
	kfree(client);
	lynx_put(lynx);

	return 0;
}

static __poll_t
nosy_poll(struct file *file, poll_table *pt)
{
	struct client *client = file->private_data;
	__poll_t ret = 0;

	poll_wait(file, &client->buffer.wait, pt);

	if (atomic_read(&client->buffer.size) > 0)
		ret = POLLIN | POLLRDNORM;

	if (list_empty(&client->lynx->link))
		ret |= POLLHUP;

	return ret;
}

static ssize_t
nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
{
	struct client *client = file->private_data;

	return packet_buffer_get(client, buffer, count);
}

static long
nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct client *client = file->private_data;
	spinlock_t *client_list_lock = &client->lynx->client_list_lock;
	struct nosy_stats stats;

	switch (cmd) {
	case NOSY_IOC_GET_STATS:
		spin_lock_irq(client_list_lock);
		stats.total_packet_count = client->buffer.total_packet_count;
		stats.lost_packet_count  = client->buffer.lost_packet_count;
		spin_unlock_irq(client_list_lock);

		if (copy_to_user((void __user *) arg, &stats, sizeof stats))
			return -EFAULT;
		else
			return 0;

	case NOSY_IOC_START:
		spin_lock_irq(client_list_lock);
		list_add_tail(&client->link, &client->lynx->client_list);
		spin_unlock_irq(client_list_lock);

		return 0;

	case NOSY_IOC_STOP:
		spin_lock_irq(client_list_lock);
		list_del_init(&client->link);
		spin_unlock_irq(client_list_lock);

		return 0;

	case NOSY_IOC_FILTER:
		spin_lock_irq(client_list_lock);
		client->tcode_mask = arg;
		spin_unlock_irq(client_list_lock);

		return 0;

	default:
		return -EINVAL;
		/* Flush buffer, configure filter. */
	}
}

static const struct file_operations nosy_ops = {
	.owner =		THIS_MODULE,
	.read =			nosy_read,
	.unlocked_ioctl =	nosy_ioctl,
	.poll =			nosy_poll,
	.open =			nosy_open,
	.release =		nosy_release,
};

#define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */

static void
packet_irq_handler(struct pcilynx *lynx)
{
	struct client *client;
	u32 tcode_mask, tcode, timestamp;
	size_t length;
	struct timespec64 ts64;

	/* FIXME: Also report rcv_speed. */

	length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
	tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;

	ktime_get_real_ts64(&ts64);
	timestamp = ts64.tv_nsec / NSEC_PER_USEC;
	lynx->rcv_buffer[0] = (__force __le32)timestamp;

	if (length == PHY_PACKET_SIZE)
		tcode_mask = 1 << TCODE_PHY_PACKET;
	else
		tcode_mask = 1 << tcode;

	spin_lock(&lynx->client_list_lock);

	list_for_each_entry(client, &lynx->client_list, link)
		if (client->tcode_mask & tcode_mask)
			packet_buffer_put(&client->buffer,
					  lynx->rcv_buffer, length + 4);

	spin_unlock(&lynx->client_list_lock);
}

static void
bus_reset_irq_handler(struct pcilynx *lynx)
{
	struct client *client;
	struct timespec64 ts64;
	u32    timestamp;

	ktime_get_real_ts64(&ts64);
	timestamp = ts64.tv_nsec / NSEC_PER_USEC;

	spin_lock(&lynx->client_list_lock);

	list_for_each_entry(client, &lynx->client_list, link)
		packet_buffer_put(&client->buffer, &timestamp, 4);

	spin_unlock(&lynx->client_list_lock);
}

static irqreturn_t
irq_handler(int irq, void *device)
{
	struct pcilynx *lynx = device;
	u32 pci_int_status;

	pci_int_status = reg_read(lynx, PCI_INT_STATUS);

	if (pci_int_status == ~0)
		/* Card was ejected. */
		return IRQ_NONE;

	if ((pci_int_status & PCI_INT_INT_PEND) == 0)
		/* Not our interrupt, bail out quickly. */
		return IRQ_NONE;

	if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
		u32 link_int_status;

		link_int_status = reg_read(lynx, LINK_INT_STATUS);
		reg_write(lynx, LINK_INT_STATUS, link_int_status);

		if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
			bus_reset_irq_handler(lynx);
	}

	/* Clear the PCI_INT_STATUS register only after clearing the
	 * LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
	 * be set again immediately. */

	reg_write(lynx, PCI_INT_STATUS, pci_int_status);

	if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
		packet_irq_handler(lynx);
		run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
	}

	return IRQ_HANDLED;
}

static void
remove_card(struct pci_dev *dev)
{
	struct pcilynx *lynx = pci_get_drvdata(dev);
	struct client *client;

	mutex_lock(&card_mutex);
	list_del_init(&lynx->link);
	misc_deregister(&lynx->misc);
	mutex_unlock(&card_mutex);

	reg_write(lynx, PCI_INT_ENABLE, 0);
	free_irq(lynx->pci_device->irq, lynx);

	spin_lock_irq(&lynx->client_list_lock);
	list_for_each_entry(client, &lynx->client_list, link)
		wake_up_interruptible(&client->buffer.wait);
	spin_unlock_irq(&lynx->client_list_lock);

	pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
			    lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
	pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
			    lynx->rcv_pcl, lynx->rcv_pcl_bus);
	pci_free_consistent(lynx->pci_device, PAGE_SIZE,
			    lynx->rcv_buffer, lynx->rcv_buffer_bus);

	iounmap(lynx->registers);
	pci_disable_device(dev);
	lynx_put(lynx);
}

#define RCV_BUFFER_SIZE (16 * 1024)

static int
add_card(struct pci_dev *dev, const struct pci_device_id *unused)
{
	struct pcilynx *lynx;
	u32 p, end;
	int ret, i;

	if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
		dev_err(&dev->dev,
		    "DMA address limits not supported for PCILynx hardware\n");
		return -ENXIO;
	}
	if (pci_enable_device(dev)) {
		dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
		return -ENXIO;
	}
	pci_set_master(dev);

	lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
	if (lynx == NULL) {
		dev_err(&dev->dev, "Failed to allocate control structure\n");
		ret = -ENOMEM;
		goto fail_disable;
	}
	lynx->pci_device = dev;
	pci_set_drvdata(dev, lynx);

	spin_lock_init(&lynx->client_list_lock);
	INIT_LIST_HEAD(&lynx->client_list);
	kref_init(&lynx->kref);

	lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
					  PCILYNX_MAX_REGISTER);
	if (lynx->registers == NULL) {
		dev_err(&dev->dev, "Failed to map registers\n");
		ret = -ENOMEM;
		goto fail_deallocate_lynx;
	}

	lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
				sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
	lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
				sizeof(struct pcl), &lynx->rcv_pcl_bus);
	lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
				RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
	if (lynx->rcv_start_pcl == NULL ||
	    lynx->rcv_pcl == NULL ||
	    lynx->rcv_buffer == NULL) {
		dev_err(&dev->dev, "Failed to allocate receive buffer\n");
		ret = -ENOMEM;
		goto fail_deallocate_buffers;
	}
	lynx->rcv_start_pcl->next	= cpu_to_le32(lynx->rcv_pcl_bus);
	lynx->rcv_pcl->next		= cpu_to_le32(PCL_NEXT_INVALID);
	lynx->rcv_pcl->async_error_next	= cpu_to_le32(PCL_NEXT_INVALID);

	lynx->rcv_pcl->buffer[0].control =
			cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
	lynx->rcv_pcl->buffer[0].pointer =
			cpu_to_le32(lynx->rcv_buffer_bus + 4);
	p = lynx->rcv_buffer_bus + 2048;
	end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
	for (i = 1; p < end; i++, p += 2048) {
		lynx->rcv_pcl->buffer[i].control =
			cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
		lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
	}
	lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);

	reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
	/* Fix buggy cards with autoboot pin not tied low: */
	reg_write(lynx, DMA0_CHAN_CTRL, 0);
	reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);

#if 0
	/* now, looking for PHY register set */
	if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
		lynx->phyic.reg_1394a = 1;
		PRINT(KERN_INFO, lynx->id,
		      "found 1394a conform PHY (using extended register set)");
		lynx->phyic.vendor = get_phy_vendorid(lynx);
		lynx->phyic.product = get_phy_productid(lynx);
	} else {
		lynx->phyic.reg_1394a = 0;
		PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
	}
#endif

	/* Setup the general receive FIFO max size. */
	reg_write(lynx, FIFO_SIZES, 255);

	reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);

	reg_write(lynx, LINK_INT_ENABLE,
		  LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
		  LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
		  LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
		  LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
		  LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);

	/* Disable the L flag in self ID packets. */
	set_phy_reg(lynx, 4, 0);

	/* Put this baby into snoop mode */
	reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);

	run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);

	if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
			driver_name, lynx)) {
		dev_err(&dev->dev,
			"Failed to allocate shared interrupt %d\n", dev->irq);
		ret = -EIO;
		goto fail_deallocate_buffers;
	}

	lynx->misc.parent = &dev->dev;
	lynx->misc.minor = MISC_DYNAMIC_MINOR;
	lynx->misc.name = "nosy";
	lynx->misc.fops = &nosy_ops;

	mutex_lock(&card_mutex);
	ret = misc_register(&lynx->misc);
	if (ret) {
		dev_err(&dev->dev, "Failed to register misc char device\n");
		mutex_unlock(&card_mutex);
		goto fail_free_irq;
	}
	list_add_tail(&lynx->link, &card_list);
	mutex_unlock(&card_mutex);

	dev_info(&dev->dev,
		 "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);

	return 0;

fail_free_irq:
	reg_write(lynx, PCI_INT_ENABLE, 0);
	free_irq(lynx->pci_device->irq, lynx);

fail_deallocate_buffers:
	if (lynx->rcv_start_pcl)
		pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
				lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
	if (lynx->rcv_pcl)
		pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
				lynx->rcv_pcl, lynx->rcv_pcl_bus);
	if (lynx->rcv_buffer)
		pci_free_consistent(lynx->pci_device, PAGE_SIZE,
				lynx->rcv_buffer, lynx->rcv_buffer_bus);
	iounmap(lynx->registers);

fail_deallocate_lynx:
	kfree(lynx);

fail_disable:
	pci_disable_device(dev);

	return ret;
}

static struct pci_device_id pci_table[] = {
	{
		.vendor =    PCI_VENDOR_ID_TI,
		.device =    PCI_DEVICE_ID_TI_PCILYNX,
		.subvendor = PCI_ANY_ID,
		.subdevice = PCI_ANY_ID,
	},
	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(pci, pci_table);

static struct pci_driver lynx_pci_driver = {
	.name =		driver_name,
	.id_table =	pci_table,
	.probe =	add_card,
	.remove =	remove_card,
};

module_pci_driver(lynx_pci_driver);

MODULE_AUTHOR("Kristian Hoegsberg");
MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
MODULE_LICENSE("GPL");