aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/firmware/dell_rbu.c
blob: 6a8b1e037e0776e7e4a1e3d1214380e062da694c (plain) (blame)
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
/*
 * dell_rbu.c
 * Bios Update driver for Dell systems
 * Author: Dell Inc
 *         Abhay Salunke <abhay_salunke@dell.com>
 *
 * Copyright (C) 2005 Dell Inc.
 *
 * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by
 * creating entries in the /sys file systems on Linux 2.6 and higher
 * kernels. The driver supports two mechanism to update the BIOS namely
 * contiguous and packetized. Both these methods still require having some
 * application to set the CMOS bit indicating the BIOS to update itself
 * after a reboot.
 *
 * Contiguous method:
 * This driver writes the incoming data in a monolithic image by allocating
 * contiguous physical pages large enough to accommodate the incoming BIOS
 * image size.
 *
 * Packetized method:
 * The driver writes the incoming packet image by allocating a new packet
 * on every time the packet data is written. This driver requires an
 * application to break the BIOS image in to fixed sized packet chunks.
 *
 * See Documentation/dell_rbu.txt for more info.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License v2.0 as published by
 * the Free Software Foundation
 *
 * 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.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/blkdev.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/dma-mapping.h>

MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
MODULE_LICENSE("GPL");
MODULE_VERSION("3.2");

#define BIOS_SCAN_LIMIT 0xffffffff
#define MAX_IMAGE_LENGTH 16
static struct _rbu_data {
	void *image_update_buffer;
	unsigned long image_update_buffer_size;
	unsigned long bios_image_size;
	int image_update_ordernum;
	int dma_alloc;
	spinlock_t lock;
	unsigned long packet_read_count;
	unsigned long num_packets;
	unsigned long packetsize;
	unsigned long imagesize;
	int entry_created;
} rbu_data;

static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
module_param_string(image_type, image_type, sizeof (image_type), 0);
MODULE_PARM_DESC(image_type,
	"BIOS image type. choose- mono or packet or init");

static unsigned long allocation_floor = 0x100000;
module_param(allocation_floor, ulong, 0644);
MODULE_PARM_DESC(allocation_floor,
    "Minimum address for allocations when using Packet mode");

struct packet_data {
	struct list_head list;
	size_t length;
	void *data;
	int ordernum;
};

static struct packet_data packet_data_head;

static struct platform_device *rbu_device;
static int context;
static dma_addr_t dell_rbu_dmaaddr;

static void init_packet_head(void)
{
	INIT_LIST_HEAD(&packet_data_head.list);
	rbu_data.packet_read_count = 0;
	rbu_data.num_packets = 0;
	rbu_data.packetsize = 0;
	rbu_data.imagesize = 0;
}

static int create_packet(void *data, size_t length)
{
	struct packet_data *newpacket;
	int ordernum = 0;
	int retval = 0;
	unsigned int packet_array_size = 0;
	void **invalid_addr_packet_array = NULL;
	void *packet_data_temp_buf = NULL;
	unsigned int idx = 0;

	pr_debug("create_packet: entry \n");

	if (!rbu_data.packetsize) {
		pr_debug("create_packet: packetsize not specified\n");
		retval = -EINVAL;
		goto out_noalloc;
	}

	spin_unlock(&rbu_data.lock);

	newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL);

	if (!newpacket) {
		printk(KERN_WARNING
			"dell_rbu:%s: failed to allocate new "
			"packet\n", __func__);
		retval = -ENOMEM;
		spin_lock(&rbu_data.lock);
		goto out_noalloc;
	}

	ordernum = get_order(length);

	/*
	 * BIOS errata mean we cannot allocate packets below 1MB or they will
	 * be overwritten by BIOS.
	 *
	 * array to temporarily hold packets
	 * that are below the allocation floor
	 *
	 * NOTE: very simplistic because we only need the floor to be at 1MB
	 *       due to BIOS errata. This shouldn't be used for higher floors
	 *       or you will run out of mem trying to allocate the array.
	 */
	packet_array_size = max(
	       		(unsigned int)(allocation_floor / rbu_data.packetsize),
			(unsigned int)1);
	invalid_addr_packet_array = kzalloc(packet_array_size * sizeof(void*),
						GFP_KERNEL);

	if (!invalid_addr_packet_array) {
		printk(KERN_WARNING
			"dell_rbu:%s: failed to allocate "
			"invalid_addr_packet_array \n",
			__func__);
		retval = -ENOMEM;
		spin_lock(&rbu_data.lock);
		goto out_alloc_packet;
	}

	while (!packet_data_temp_buf) {
		packet_data_temp_buf = (unsigned char *)
			__get_free_pages(GFP_KERNEL, ordernum);
		if (!packet_data_temp_buf) {
			printk(KERN_WARNING
				"dell_rbu:%s: failed to allocate new "
				"packet\n", __func__);
			retval = -ENOMEM;
			spin_lock(&rbu_data.lock);
			goto out_alloc_packet_array;
		}

		if ((unsigned long)virt_to_phys(packet_data_temp_buf)
				< allocation_floor) {
			pr_debug("packet 0x%lx below floor at 0x%lx.\n",
					(unsigned long)virt_to_phys(
						packet_data_temp_buf),
					allocation_floor);
			invalid_addr_packet_array[idx++] = packet_data_temp_buf;
			packet_data_temp_buf = NULL;
		}
	}
	spin_lock(&rbu_data.lock);

	newpacket->data = packet_data_temp_buf;

	pr_debug("create_packet: newpacket at physical addr %lx\n",
		(unsigned long)virt_to_phys(newpacket->data));

	/* packets may not have fixed size */
	newpacket->length = length;
	newpacket->ordernum = ordernum;
	++rbu_data.num_packets;

	/* initialize the newly created packet headers */
	INIT_LIST_HEAD(&newpacket->list);
	list_add_tail(&newpacket->list, &packet_data_head.list);

	memcpy(newpacket->data, data, length);

	pr_debug("create_packet: exit \n");

out_alloc_packet_array:
	/* always free packet array */
	for (;idx>0;idx--) {
		pr_debug("freeing unused packet below floor 0x%lx.\n",
			(unsigned long)virt_to_phys(
				invalid_addr_packet_array[idx-1]));
		free_pages((unsigned long)invalid_addr_packet_array[idx-1],
			ordernum);
	}
	kfree(invalid_addr_packet_array);

out_alloc_packet:
	/* if error, free data */
	if (retval)
		kfree(newpacket);

out_noalloc:
	return retval;
}

static int packetize_data(void *data, size_t length)
{
	int rc = 0;
	int done = 0;
	int packet_length;
	u8 *temp;
	u8 *end = (u8 *) data + length;
	pr_debug("packetize_data: data length %zd\n", length);
	if (!rbu_data.packetsize) {
		printk(KERN_WARNING
			"dell_rbu: packetsize not specified\n");
		return -EIO;
	}

	temp = (u8 *) data;

	/* packetize the hunk */
	while (!done) {
		if ((temp + rbu_data.packetsize) < end)
			packet_length = rbu_data.packetsize;
		else {
			/* this is the last packet */
			packet_length = end - temp;
			done = 1;
		}

		if ((rc = create_packet(temp, packet_length)))
			return rc;

		pr_debug("%p:%td\n", temp, (end - temp));
		temp += packet_length;
	}

	rbu_data.imagesize = length;

	return rc;
}

static int do_packet_read(char *data, struct list_head *ptemp_list,
	int length, int bytes_read, int *list_read_count)
{
	void *ptemp_buf;
	struct packet_data *newpacket = NULL;
	int bytes_copied = 0;
	int j = 0;

	newpacket = list_entry(ptemp_list, struct packet_data, list);
	*list_read_count += newpacket->length;

	if (*list_read_count > bytes_read) {
		/* point to the start of unread data */
		j = newpacket->length - (*list_read_count - bytes_read);
		/* point to the offset in the packet buffer */
		ptemp_buf = (u8 *) newpacket->data + j;
		/*
		 * check if there is enough room in
		 * * the incoming buffer
		 */
		if (length > (*list_read_count - bytes_read))
			/*
			 * copy what ever is there in this
			 * packet and move on
			 */
			bytes_copied = (*list_read_count - bytes_read);
		else
			/* copy the remaining */
			bytes_copied = length;
		memcpy(data, ptemp_buf, bytes_copied);
	}
	return bytes_copied;
}

static int packet_read_list(char *data, size_t * pread_length)
{
	struct list_head *ptemp_list;
	int temp_count = 0;
	int bytes_copied = 0;
	int bytes_read = 0;
	int remaining_bytes = 0;
	char *pdest = data;

	/* check if we have any packets */
	if (0 == rbu_data.num_packets)
		return -ENOMEM;

	remaining_bytes = *pread_length;
	bytes_read = rbu_data.packet_read_count;

	ptemp_list = (&packet_data_head.list)->next;
	while (!list_empty(ptemp_list)) {
		bytes_copied = do_packet_read(pdest, ptemp_list,
			remaining_bytes, bytes_read, &temp_count);
		remaining_bytes -= bytes_copied;
		bytes_read += bytes_copied;
		pdest += bytes_copied;
		/*
		 * check if we reached end of buffer before reaching the
		 * last packet
		 */
		if (remaining_bytes == 0)
			break;

		ptemp_list = ptemp_list->next;
	}
	/*finally set the bytes read */
	*pread_length = bytes_read - rbu_data.packet_read_count;
	rbu_data.packet_read_count = bytes_read;
	return 0;
}

static void packet_empty_list(void)
{
	struct list_head *ptemp_list;
	struct list_head *pnext_list;
	struct packet_data *newpacket;

	ptemp_list = (&packet_data_head.list)->next;
	while (!list_empty(ptemp_list)) {
		newpacket =
			list_entry(ptemp_list, struct packet_data, list);
		pnext_list = ptemp_list->next;
		list_del(ptemp_list);
		ptemp_list = pnext_list;
		/*
		 * zero out the RBU packet memory before freeing
		 * to make sure there are no stale RBU packets left in memory
		 */
		memset(newpacket->data, 0, rbu_data.packetsize);
		free_pages((unsigned long) newpacket->data,
			newpacket->ordernum);
		kfree(newpacket);
	}
	rbu_data.packet_read_count = 0;
	rbu_data.num_packets = 0;
	rbu_data.imagesize = 0;
}

/*
 * img_update_free: Frees the buffer allocated for storing BIOS image
 * Always called with lock held and returned with lock held
 */
static void img_update_free(void)
{
	if (!rbu_data.image_update_buffer)
		return;
	/*
	 * zero out this buffer before freeing it to get rid of any stale
	 * BIOS image copied in memory.
	 */
	memset(rbu_data.image_update_buffer, 0,
		rbu_data.image_update_buffer_size);
	if (rbu_data.dma_alloc == 1)
		dma_free_coherent(NULL, rbu_data.bios_image_size,
			rbu_data.image_update_buffer, dell_rbu_dmaaddr);
	else
		free_pages((unsigned long) rbu_data.image_update_buffer,
			rbu_data.image_update_ordernum);

	/*
	 * Re-initialize the rbu_data variables after a free
	 */
	rbu_data.image_update_ordernum = -1;
	rbu_data.image_update_buffer = NULL;
	rbu_data.image_update_buffer_size = 0;
	rbu_data.bios_image_size = 0;
	rbu_data.dma_alloc = 0;
}

/*
 * img_update_realloc: This function allocates the contiguous pages to
 * accommodate the requested size of data. The memory address and size
 * values are stored globally and on every call to this function the new
 * size is checked to see if more data is required than the existing size.
 * If true the previous memory is freed and new allocation is done to
 * accommodate the new size. If the incoming size is less then than the
 * already allocated size, then that memory is reused. This function is
 * called with lock held and returns with lock held.
 */
static int img_update_realloc(unsigned long size)
{
	unsigned char *image_update_buffer = NULL;
	unsigned long rc;
	unsigned long img_buf_phys_addr;
	int ordernum;
	int dma_alloc = 0;

	/*
	 * check if the buffer of sufficient size has been
	 * already allocated
	 */
	if (rbu_data.image_update_buffer_size >= size) {
		/*
		 * check for corruption
		 */
		if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
			printk(KERN_ERR "dell_rbu:%s: corruption "
				"check failed\n", __func__);
			return -EINVAL;
		}
		/*
		 * we have a valid pre-allocated buffer with
		 * sufficient size
		 */
		return 0;
	}

	/*
	 * free any previously allocated buffer
	 */
	img_update_free();

	spin_unlock(&rbu_data.lock);

	ordernum = get_order(size);
	image_update_buffer =
		(unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);

	img_buf_phys_addr =
		(unsigned long) virt_to_phys(image_update_buffer);

	if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
		free_pages((unsigned long) image_update_buffer, ordernum);
		ordernum = -1;
		image_update_buffer = dma_alloc_coherent(NULL, size,
			&dell_rbu_dmaaddr, GFP_KERNEL);
		dma_alloc = 1;
	}

	spin_lock(&rbu_data.lock);

	if (image_update_buffer != NULL) {
		rbu_data.image_update_buffer = image_update_buffer;
		rbu_data.image_update_buffer_size = size;
		rbu_data.bios_image_size =
			rbu_data.image_update_buffer_size;
		rbu_data.image_update_ordernum = ordernum;
		rbu_data.dma_alloc = dma_alloc;
		rc = 0;
	} else {
		pr_debug("Not enough memory for image update:"
			"size = %ld\n", size);
		rc = -ENOMEM;
	}

	return rc;
}

static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
{
	int retval;
	size_t bytes_left;
	size_t data_length;
	char *ptempBuf = buffer;

	/* check to see if we have something to return */
	if (rbu_data.num_packets == 0) {
		pr_debug("read_packet_data: no packets written\n");
		retval = -ENOMEM;
		goto read_rbu_data_exit;
	}

	if (pos > rbu_data.imagesize) {
		retval = 0;
		printk(KERN_WARNING "dell_rbu:read_packet_data: "
			"data underrun\n");
		goto read_rbu_data_exit;
	}

	bytes_left = rbu_data.imagesize - pos;
	data_length = min(bytes_left, count);

	if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
		goto read_rbu_data_exit;

	if ((pos + count) > rbu_data.imagesize) {
		rbu_data.packet_read_count = 0;
		/* this was the last copy */
		retval = bytes_left;
	} else
		retval = count;

      read_rbu_data_exit:
	return retval;
}

static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
{
	unsigned char *ptemp = NULL;
	size_t bytes_left = 0;
	size_t data_length = 0;
	ssize_t ret_count = 0;

	/* check to see if we have something to return */
	if ((rbu_data.image_update_buffer == NULL) ||
		(rbu_data.bios_image_size == 0)) {
		pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
			"bios_image_size %lu\n",
			rbu_data.image_update_buffer,
			rbu_data.bios_image_size);
		ret_count = -ENOMEM;
		goto read_rbu_data_exit;
	}

	if (pos > rbu_data.bios_image_size) {
		ret_count = 0;
		goto read_rbu_data_exit;
	}

	bytes_left = rbu_data.bios_image_size - pos;
	data_length = min(bytes_left, count);

	ptemp = rbu_data.image_update_buffer;
	memcpy(buffer, (ptemp + pos), data_length);

	if ((pos + count) > rbu_data.bios_image_size)
		/* this was the last copy */
		ret_count = bytes_left;
	else
		ret_count = count;
      read_rbu_data_exit:
	return ret_count;
}

static ssize_t read_rbu_data(struct kobject *kobj,
			     struct bin_attribute *bin_attr,
			     char *buffer, loff_t pos, size_t count)
{
	ssize_t ret_count = 0;

	spin_lock(&rbu_data.lock);

	if (!strcmp(image_type, "mono"))
		ret_count = read_rbu_mono_data(buffer, pos, count);
	else if (!strcmp(image_type, "packet"))
		ret_count = read_packet_data(buffer, pos, count);
	else
		pr_debug("read_rbu_data: invalid image type specified\n");

	spin_unlock(&rbu_data.lock);
	return ret_count;
}

static void callbackfn_rbu(const struct firmware *fw, void *context)
{
	rbu_data.entry_created = 0;

	if (!fw || !fw->size)
		return;

	spin_lock(&rbu_data.lock);
	if (!strcmp(image_type, "mono")) {
		if (!img_update_realloc(fw->size))
			memcpy(rbu_data.image_update_buffer,
				fw->data, fw->size);
	} else if (!strcmp(image_type, "packet")) {
		/*
		 * we need to free previous packets if a
		 * new hunk of packets needs to be downloaded
		 */
		packet_empty_list();
		if (packetize_data(fw->data, fw->size))
			/* Incase something goes wrong when we are
			 * in middle of packetizing the data, we
			 * need to free up whatever packets might
			 * have been created before we quit.
			 */
			packet_empty_list();
	} else
		pr_debug("invalid image type specified.\n");
	spin_unlock(&rbu_data.lock);
}

static ssize_t read_rbu_image_type(struct kobject *kobj,
				   struct bin_attribute *bin_attr,
				   char *buffer, loff_t pos, size_t count)
{
	int size = 0;
	if (!pos)
		size = sprintf(buffer, "%s\n", image_type);
	return size;
}

static ssize_t write_rbu_image_type(struct kobject *kobj,
				    struct bin_attribute *bin_attr,
				    char *buffer, loff_t pos, size_t count)
{
	int rc = count;
	int req_firm_rc = 0;
	int i;
	spin_lock(&rbu_data.lock);
	/*
	 * Find the first newline or space
	 */
	for (i = 0; i < count; ++i)
		if (buffer[i] == '\n' || buffer[i] == ' ') {
			buffer[i] = '\0';
			break;
		}
	if (i == count)
		buffer[count] = '\0';

	if (strstr(buffer, "mono"))
		strcpy(image_type, "mono");
	else if (strstr(buffer, "packet"))
		strcpy(image_type, "packet");
	else if (strstr(buffer, "init")) {
		/*
		 * If due to the user error the driver gets in a bad
		 * state where even though it is loaded , the
		 * /sys/class/firmware/dell_rbu entries are missing.
		 * to cover this situation the user can recreate entries
		 * by writing init to image_type.
		 */
		if (!rbu_data.entry_created) {
			spin_unlock(&rbu_data.lock);
			req_firm_rc = request_firmware_nowait(THIS_MODULE,
				FW_ACTION_NOHOTPLUG, "dell_rbu",
				&rbu_device->dev, &context,
				callbackfn_rbu);
			if (req_firm_rc) {
				printk(KERN_ERR
					"dell_rbu:%s request_firmware_nowait"
					" failed %d\n", __func__, rc);
				rc = -EIO;
			} else
				rbu_data.entry_created = 1;

			spin_lock(&rbu_data.lock);
		}
	} else {
		printk(KERN_WARNING "dell_rbu: image_type is invalid\n");
		spin_unlock(&rbu_data.lock);
		return -EINVAL;
	}

	/* we must free all previous allocations */
	packet_empty_list();
	img_update_free();
	spin_unlock(&rbu_data.lock);

	return rc;
}

static ssize_t read_rbu_packet_size(struct kobject *kobj,
				    struct bin_attribute *bin_attr,
				    char *buffer, loff_t pos, size_t count)
{
	int size = 0;
	if (!pos) {
		spin_lock(&rbu_data.lock);
		size = sprintf(buffer, "%lu\n", rbu_data.packetsize);
		spin_unlock(&rbu_data.lock);
	}
	return size;
}

static ssize_t write_rbu_packet_size(struct kobject *kobj,
				     struct bin_attribute *bin_attr,
				     char *buffer, loff_t pos, size_t count)
{
	unsigned long temp;
	spin_lock(&rbu_data.lock);
	packet_empty_list();
	sscanf(buffer, "%lu", &temp);
	if (temp < 0xffffffff)
		rbu_data.packetsize = temp;

	spin_unlock(&rbu_data.lock);
	return count;
}

static struct bin_attribute rbu_data_attr = {
	.attr = {.name = "data", .mode = 0444},
	.read = read_rbu_data,
};

static struct bin_attribute rbu_image_type_attr = {
	.attr = {.name = "image_type", .mode = 0644},
	.read = read_rbu_image_type,
	.write = write_rbu_image_type,
};

static struct bin_attribute rbu_packet_size_attr = {
	.attr = {.name = "packet_size", .mode = 0644},
	.read = read_rbu_packet_size,
	.write = write_rbu_packet_size,
};

static int __init dcdrbu_init(void)
{
	int rc;
	spin_lock_init(&rbu_data.lock);

	init_packet_head();
	rbu_device = platform_device_register_simple("dell_rbu", -1, NULL, 0);
	if (IS_ERR(rbu_device)) {
		printk(KERN_ERR
			"dell_rbu:%s:platform_device_register_simple "
			"failed\n", __func__);
		return PTR_ERR(rbu_device);
	}

	rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
	if (rc)
		goto out_devreg;
	rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
	if (rc)
		goto out_data;
	rc = sysfs_create_bin_file(&rbu_device->dev.kobj,
		&rbu_packet_size_attr);
	if (rc)
		goto out_imtype;

	rbu_data.entry_created = 0;
	return 0;

out_imtype:
	sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
out_data:
	sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
out_devreg:
	platform_device_unregister(rbu_device);
	return rc;
}

static __exit void dcdrbu_exit(void)
{
	spin_lock(&rbu_data.lock);
	packet_empty_list();
	img_update_free();
	spin_unlock(&rbu_data.lock);
	platform_device_unregister(rbu_device);
}

module_exit(dcdrbu_exit);
module_init(dcdrbu_init);

/* vim:noet:ts=8:sw=8
*/