[PATCH] dell_rbu: fix Bug 5854
[linux-2.6.git] / drivers / firmware / dell_rbu.c
1 /*
2  * dell_rbu.c
3  * Bios Update driver for Dell systems
4  * Author: Dell Inc
5  *         Abhay Salunke <abhay_salunke@dell.com>
6  *
7  * Copyright (C) 2005 Dell Inc.
8  *
9  * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by
10  * creating entries in the /sys file systems on Linux 2.6 and higher
11  * kernels. The driver supports two mechanism to update the BIOS namely
12  * contiguous and packetized. Both these methods still require having some
13  * application to set the CMOS bit indicating the BIOS to update itself
14  * after a reboot.
15  *
16  * Contiguous method:
17  * This driver writes the incoming data in a monolithic image by allocating
18  * contiguous physical pages large enough to accommodate the incoming BIOS
19  * image size.
20  *
21  * Packetized method:
22  * The driver writes the incoming packet image by allocating a new packet
23  * on every time the packet data is written. This driver requires an
24  * application to break the BIOS image in to fixed sized packet chunks.
25  *
26  * See Documentation/dell_rbu.txt for more info.
27  *
28  * This program is free software; you can redistribute it and/or modify
29  * it under the terms of the GNU General Public License v2.0 as published by
30  * the Free Software Foundation
31  *
32  * This program is distributed in the hope that it will be useful,
33  * but WITHOUT ANY WARRANTY; without even the implied warranty of
34  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
35  * GNU General Public License for more details.
36  */
37 #include <linux/config.h>
38 #include <linux/init.h>
39 #include <linux/module.h>
40 #include <linux/string.h>
41 #include <linux/errno.h>
42 #include <linux/blkdev.h>
43 #include <linux/platform_device.h>
44 #include <linux/spinlock.h>
45 #include <linux/moduleparam.h>
46 #include <linux/firmware.h>
47 #include <linux/dma-mapping.h>
48
49 MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
50 MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
51 MODULE_LICENSE("GPL");
52 MODULE_VERSION("3.2");
53
54 #define BIOS_SCAN_LIMIT 0xffffffff
55 #define MAX_IMAGE_LENGTH 16
56 static struct _rbu_data {
57         void *image_update_buffer;
58         unsigned long image_update_buffer_size;
59         unsigned long bios_image_size;
60         int image_update_ordernum;
61         int dma_alloc;
62         spinlock_t lock;
63         unsigned long packet_read_count;
64         unsigned long num_packets;
65         unsigned long packetsize;
66         unsigned long imagesize;
67         int entry_created;
68 } rbu_data;
69
70 static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
71 module_param_string(image_type, image_type, sizeof (image_type), 0);
72 MODULE_PARM_DESC(image_type,
73         "BIOS image type. choose- mono or packet or init");
74
75 static unsigned long allocation_floor = 0x100000;
76 module_param(allocation_floor, ulong, 0644);
77 MODULE_PARM_DESC(allocation_floor,
78     "Minimum address for allocations when using Packet mode");
79
80 struct packet_data {
81         struct list_head list;
82         size_t length;
83         void *data;
84         int ordernum;
85 };
86
87 static struct packet_data packet_data_head;
88
89 static struct platform_device *rbu_device;
90 static int context;
91 static dma_addr_t dell_rbu_dmaaddr;
92
93 static void init_packet_head(void)
94 {
95         INIT_LIST_HEAD(&packet_data_head.list);
96         rbu_data.packet_read_count = 0;
97         rbu_data.num_packets = 0;
98         rbu_data.packetsize = 0;
99         rbu_data.imagesize = 0;
100 }
101
102 static int create_packet(void *data, size_t length)
103 {
104         struct packet_data *newpacket;
105         int ordernum = 0;
106         int retval = 0;
107         unsigned int packet_array_size = 0;
108         void **invalid_addr_packet_array = NULL;
109         void *packet_data_temp_buf = NULL;
110         unsigned int idx = 0;
111
112         pr_debug("create_packet: entry \n");
113
114         if (!rbu_data.packetsize) {
115                 pr_debug("create_packet: packetsize not specified\n");
116                 retval = -EINVAL;
117                 goto out_noalloc;
118         }
119
120         spin_unlock(&rbu_data.lock);
121
122         newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL);
123
124         if (!newpacket) {
125                 printk(KERN_WARNING
126                         "dell_rbu:%s: failed to allocate new "
127                         "packet\n", __FUNCTION__);
128                 retval = -ENOMEM;
129                 spin_lock(&rbu_data.lock);
130                 goto out_noalloc;
131         }
132
133         ordernum = get_order(length);
134
135         /*
136          * BIOS errata mean we cannot allocate packets below 1MB or they will
137          * be overwritten by BIOS.
138          *
139          * array to temporarily hold packets
140          * that are below the allocation floor
141          *
142          * NOTE: very simplistic because we only need the floor to be at 1MB
143          *       due to BIOS errata. This shouldn't be used for higher floors
144          *       or you will run out of mem trying to allocate the array.
145          */
146         packet_array_size = max(
147                         (unsigned int)(allocation_floor / rbu_data.packetsize),
148                         (unsigned int)1);
149         invalid_addr_packet_array = kzalloc(packet_array_size * sizeof(void*),
150                                                 GFP_KERNEL);
151
152         if (!invalid_addr_packet_array) {
153                 printk(KERN_WARNING
154                         "dell_rbu:%s: failed to allocate "
155                         "invalid_addr_packet_array \n",
156                         __FUNCTION__);
157                 retval = -ENOMEM;
158                 spin_lock(&rbu_data.lock);
159                 goto out_alloc_packet;
160         }
161
162         while (!packet_data_temp_buf) {
163                 packet_data_temp_buf = (unsigned char *)
164                         __get_free_pages(GFP_KERNEL, ordernum);
165                 if (!packet_data_temp_buf) {
166                         printk(KERN_WARNING
167                                 "dell_rbu:%s: failed to allocate new "
168                                 "packet\n", __FUNCTION__);
169                         retval = -ENOMEM;
170                         spin_lock(&rbu_data.lock);
171                         goto out_alloc_packet_array;
172                 }
173
174                 if ((unsigned long)virt_to_phys(packet_data_temp_buf)
175                                 < allocation_floor) {
176                         pr_debug("packet 0x%lx below floor at 0x%lx.\n",
177                                         (unsigned long)virt_to_phys(
178                                                 packet_data_temp_buf),
179                                         allocation_floor);
180                         invalid_addr_packet_array[idx++] = packet_data_temp_buf;
181                         packet_data_temp_buf = NULL;
182                 }
183         }
184         spin_lock(&rbu_data.lock);
185
186         newpacket->data = packet_data_temp_buf;
187
188         pr_debug("create_packet: newpacket at physical addr %lx\n",
189                 (unsigned long)virt_to_phys(newpacket->data));
190
191         /* packets may not have fixed size */
192         newpacket->length = length;
193         newpacket->ordernum = ordernum;
194         ++rbu_data.num_packets;
195
196         /* initialize the newly created packet headers */
197         INIT_LIST_HEAD(&newpacket->list);
198         list_add_tail(&newpacket->list, &packet_data_head.list);
199
200         memcpy(newpacket->data, data, length);
201
202         pr_debug("create_packet: exit \n");
203
204 out_alloc_packet_array:
205         /* always free packet array */
206         for (;idx>0;idx--) {
207                 pr_debug("freeing unused packet below floor 0x%lx.\n",
208                         (unsigned long)virt_to_phys(
209                                 invalid_addr_packet_array[idx-1]));
210                 free_pages((unsigned long)invalid_addr_packet_array[idx-1],
211                         ordernum);
212         }
213         kfree(invalid_addr_packet_array);
214
215 out_alloc_packet:
216         /* if error, free data */
217         if (retval)
218                 kfree(newpacket);
219
220 out_noalloc:
221         return retval;
222 }
223
224 static int packetize_data(void *data, size_t length)
225 {
226         int rc = 0;
227         int done = 0;
228         int packet_length;
229         u8 *temp;
230         u8 *end = (u8 *) data + length;
231         pr_debug("packetize_data: data length %d\n", length);
232         if (!rbu_data.packetsize) {
233                 printk(KERN_WARNING
234                         "dell_rbu: packetsize not specified\n");
235                 return -EIO;
236         }
237
238         temp = (u8 *) data;
239
240         /* packetize the hunk */
241         while (!done) {
242                 if ((temp + rbu_data.packetsize) < end)
243                         packet_length = rbu_data.packetsize;
244                 else {
245                         /* this is the last packet */
246                         packet_length = end - temp;
247                         done = 1;
248                 }
249
250                 if ((rc = create_packet(temp, packet_length)))
251                         return rc;
252
253                 pr_debug("%lu:%lu\n", temp, (end - temp));
254                 temp += packet_length;
255         }
256
257         rbu_data.imagesize = length;
258
259         return rc;
260 }
261
262 static int do_packet_read(char *data, struct list_head *ptemp_list,
263         int length, int bytes_read, int *list_read_count)
264 {
265         void *ptemp_buf;
266         struct packet_data *newpacket = NULL;
267         int bytes_copied = 0;
268         int j = 0;
269
270         newpacket = list_entry(ptemp_list, struct packet_data, list);
271         *list_read_count += newpacket->length;
272
273         if (*list_read_count > bytes_read) {
274                 /* point to the start of unread data */
275                 j = newpacket->length - (*list_read_count - bytes_read);
276                 /* point to the offset in the packet buffer */
277                 ptemp_buf = (u8 *) newpacket->data + j;
278                 /*
279                  * check if there is enough room in
280                  * * the incoming buffer
281                  */
282                 if (length > (*list_read_count - bytes_read))
283                         /*
284                          * copy what ever is there in this
285                          * packet and move on
286                          */
287                         bytes_copied = (*list_read_count - bytes_read);
288                 else
289                         /* copy the remaining */
290                         bytes_copied = length;
291                 memcpy(data, ptemp_buf, bytes_copied);
292         }
293         return bytes_copied;
294 }
295
296 static int packet_read_list(char *data, size_t * pread_length)
297 {
298         struct list_head *ptemp_list;
299         int temp_count = 0;
300         int bytes_copied = 0;
301         int bytes_read = 0;
302         int remaining_bytes = 0;
303         char *pdest = data;
304
305         /* check if we have any packets */
306         if (0 == rbu_data.num_packets)
307                 return -ENOMEM;
308
309         remaining_bytes = *pread_length;
310         bytes_read = rbu_data.packet_read_count;
311
312         ptemp_list = (&packet_data_head.list)->next;
313         while (!list_empty(ptemp_list)) {
314                 bytes_copied = do_packet_read(pdest, ptemp_list,
315                         remaining_bytes, bytes_read, &temp_count);
316                 remaining_bytes -= bytes_copied;
317                 bytes_read += bytes_copied;
318                 pdest += bytes_copied;
319                 /*
320                  * check if we reached end of buffer before reaching the
321                  * last packet
322                  */
323                 if (remaining_bytes == 0)
324                         break;
325
326                 ptemp_list = ptemp_list->next;
327         }
328         /*finally set the bytes read */
329         *pread_length = bytes_read - rbu_data.packet_read_count;
330         rbu_data.packet_read_count = bytes_read;
331         return 0;
332 }
333
334 static void packet_empty_list(void)
335 {
336         struct list_head *ptemp_list;
337         struct list_head *pnext_list;
338         struct packet_data *newpacket;
339
340         ptemp_list = (&packet_data_head.list)->next;
341         while (!list_empty(ptemp_list)) {
342                 newpacket =
343                         list_entry(ptemp_list, struct packet_data, list);
344                 pnext_list = ptemp_list->next;
345                 list_del(ptemp_list);
346                 ptemp_list = pnext_list;
347                 /*
348                  * zero out the RBU packet memory before freeing
349                  * to make sure there are no stale RBU packets left in memory
350                  */
351                 memset(newpacket->data, 0, rbu_data.packetsize);
352                 free_pages((unsigned long) newpacket->data,
353                         newpacket->ordernum);
354                 kfree(newpacket);
355         }
356         rbu_data.packet_read_count = 0;
357         rbu_data.num_packets = 0;
358         rbu_data.imagesize = 0;
359 }
360
361 /*
362  * img_update_free: Frees the buffer allocated for storing BIOS image
363  * Always called with lock held and returned with lock held
364  */
365 static void img_update_free(void)
366 {
367         if (!rbu_data.image_update_buffer)
368                 return;
369         /*
370          * zero out this buffer before freeing it to get rid of any stale
371          * BIOS image copied in memory.
372          */
373         memset(rbu_data.image_update_buffer, 0,
374                 rbu_data.image_update_buffer_size);
375         if (rbu_data.dma_alloc == 1)
376                 dma_free_coherent(NULL, rbu_data.bios_image_size,
377                         rbu_data.image_update_buffer, dell_rbu_dmaaddr);
378         else
379                 free_pages((unsigned long) rbu_data.image_update_buffer,
380                         rbu_data.image_update_ordernum);
381
382         /*
383          * Re-initialize the rbu_data variables after a free
384          */
385         rbu_data.image_update_ordernum = -1;
386         rbu_data.image_update_buffer = NULL;
387         rbu_data.image_update_buffer_size = 0;
388         rbu_data.bios_image_size = 0;
389         rbu_data.dma_alloc = 0;
390 }
391
392 /*
393  * img_update_realloc: This function allocates the contiguous pages to
394  * accommodate the requested size of data. The memory address and size
395  * values are stored globally and on every call to this function the new
396  * size is checked to see if more data is required than the existing size.
397  * If true the previous memory is freed and new allocation is done to
398  * accommodate the new size. If the incoming size is less then than the
399  * already allocated size, then that memory is reused. This function is
400  * called with lock held and returns with lock held.
401  */
402 static int img_update_realloc(unsigned long size)
403 {
404         unsigned char *image_update_buffer = NULL;
405         unsigned long rc;
406         unsigned long img_buf_phys_addr;
407         int ordernum;
408         int dma_alloc = 0;
409
410         /*
411          * check if the buffer of sufficient size has been
412          * already allocated
413          */
414         if (rbu_data.image_update_buffer_size >= size) {
415                 /*
416                  * check for corruption
417                  */
418                 if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
419                         printk(KERN_ERR "dell_rbu:%s: corruption "
420                                 "check failed\n", __FUNCTION__);
421                         return -EINVAL;
422                 }
423                 /*
424                  * we have a valid pre-allocated buffer with
425                  * sufficient size
426                  */
427                 return 0;
428         }
429
430         /*
431          * free any previously allocated buffer
432          */
433         img_update_free();
434
435         spin_unlock(&rbu_data.lock);
436
437         ordernum = get_order(size);
438         image_update_buffer =
439                 (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);
440
441         img_buf_phys_addr =
442                 (unsigned long) virt_to_phys(image_update_buffer);
443
444         if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
445                 free_pages((unsigned long) image_update_buffer, ordernum);
446                 ordernum = -1;
447                 image_update_buffer = dma_alloc_coherent(NULL, size,
448                         &dell_rbu_dmaaddr, GFP_KERNEL);
449                 dma_alloc = 1;
450         }
451
452         spin_lock(&rbu_data.lock);
453
454         if (image_update_buffer != NULL) {
455                 rbu_data.image_update_buffer = image_update_buffer;
456                 rbu_data.image_update_buffer_size = size;
457                 rbu_data.bios_image_size =
458                         rbu_data.image_update_buffer_size;
459                 rbu_data.image_update_ordernum = ordernum;
460                 rbu_data.dma_alloc = dma_alloc;
461                 rc = 0;
462         } else {
463                 pr_debug("Not enough memory for image update:"
464                         "size = %ld\n", size);
465                 rc = -ENOMEM;
466         }
467
468         return rc;
469 }
470
471 static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
472 {
473         int retval;
474         size_t bytes_left;
475         size_t data_length;
476         char *ptempBuf = buffer;
477
478         /* check to see if we have something to return */
479         if (rbu_data.num_packets == 0) {
480                 pr_debug("read_packet_data: no packets written\n");
481                 retval = -ENOMEM;
482                 goto read_rbu_data_exit;
483         }
484
485         if (pos > rbu_data.imagesize) {
486                 retval = 0;
487                 printk(KERN_WARNING "dell_rbu:read_packet_data: "
488                         "data underrun\n");
489                 goto read_rbu_data_exit;
490         }
491
492         bytes_left = rbu_data.imagesize - pos;
493         data_length = min(bytes_left, count);
494
495         if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
496                 goto read_rbu_data_exit;
497
498         if ((pos + count) > rbu_data.imagesize) {
499                 rbu_data.packet_read_count = 0;
500                 /* this was the last copy */
501                 retval = bytes_left;
502         } else
503                 retval = count;
504
505       read_rbu_data_exit:
506         return retval;
507 }
508
509 static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
510 {
511         unsigned char *ptemp = NULL;
512         size_t bytes_left = 0;
513         size_t data_length = 0;
514         ssize_t ret_count = 0;
515
516         /* check to see if we have something to return */
517         if ((rbu_data.image_update_buffer == NULL) ||
518                 (rbu_data.bios_image_size == 0)) {
519                 pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
520                         "bios_image_size %lu\n",
521                         rbu_data.image_update_buffer,
522                         rbu_data.bios_image_size);
523                 ret_count = -ENOMEM;
524                 goto read_rbu_data_exit;
525         }
526
527         if (pos > rbu_data.bios_image_size) {
528                 ret_count = 0;
529                 goto read_rbu_data_exit;
530         }
531
532         bytes_left = rbu_data.bios_image_size - pos;
533         data_length = min(bytes_left, count);
534
535         ptemp = rbu_data.image_update_buffer;
536         memcpy(buffer, (ptemp + pos), data_length);
537
538         if ((pos + count) > rbu_data.bios_image_size)
539                 /* this was the last copy */
540                 ret_count = bytes_left;
541         else
542                 ret_count = count;
543       read_rbu_data_exit:
544         return ret_count;
545 }
546
547 static ssize_t read_rbu_data(struct kobject *kobj, char *buffer,
548         loff_t pos, size_t count)
549 {
550         ssize_t ret_count = 0;
551
552         spin_lock(&rbu_data.lock);
553
554         if (!strcmp(image_type, "mono"))
555                 ret_count = read_rbu_mono_data(buffer, pos, count);
556         else if (!strcmp(image_type, "packet"))
557                 ret_count = read_packet_data(buffer, pos, count);
558         else
559                 pr_debug("read_rbu_data: invalid image type specified\n");
560
561         spin_unlock(&rbu_data.lock);
562         return ret_count;
563 }
564
565 static void callbackfn_rbu(const struct firmware *fw, void *context)
566 {
567         rbu_data.entry_created = 0;
568
569         if (!fw || !fw->size)
570                 return;
571
572         spin_lock(&rbu_data.lock);
573         if (!strcmp(image_type, "mono")) {
574                 if (!img_update_realloc(fw->size))
575                         memcpy(rbu_data.image_update_buffer,
576                                 fw->data, fw->size);
577         } else if (!strcmp(image_type, "packet")) {
578                 /*
579                  * we need to free previous packets if a
580                  * new hunk of packets needs to be downloaded
581                  */
582                 packet_empty_list();
583                 if (packetize_data(fw->data, fw->size))
584                         /* Incase something goes wrong when we are
585                          * in middle of packetizing the data, we
586                          * need to free up whatever packets might
587                          * have been created before we quit.
588                          */
589                         packet_empty_list();
590         } else
591                 pr_debug("invalid image type specified.\n");
592         spin_unlock(&rbu_data.lock);
593 }
594
595 static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer,
596         loff_t pos, size_t count)
597 {
598         int size = 0;
599         if (!pos)
600                 size = sprintf(buffer, "%s\n", image_type);
601         return size;
602 }
603
604 static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer,
605         loff_t pos, size_t count)
606 {
607         int rc = count;
608         int req_firm_rc = 0;
609         int i;
610         spin_lock(&rbu_data.lock);
611         /*
612          * Find the first newline or space
613          */
614         for (i = 0; i < count; ++i)
615                 if (buffer[i] == '\n' || buffer[i] == ' ') {
616                         buffer[i] = '\0';
617                         break;
618                 }
619         if (i == count)
620                 buffer[count] = '\0';
621
622         if (strstr(buffer, "mono"))
623                 strcpy(image_type, "mono");
624         else if (strstr(buffer, "packet"))
625                 strcpy(image_type, "packet");
626         else if (strstr(buffer, "init")) {
627                 /*
628                  * If due to the user error the driver gets in a bad
629                  * state where even though it is loaded , the
630                  * /sys/class/firmware/dell_rbu entries are missing.
631                  * to cover this situation the user can recreate entries
632                  * by writing init to image_type.
633                  */
634                 if (!rbu_data.entry_created) {
635                         spin_unlock(&rbu_data.lock);
636                         req_firm_rc = request_firmware_nowait(THIS_MODULE,
637                                 FW_ACTION_NOHOTPLUG, "dell_rbu",
638                                 &rbu_device->dev, &context,
639                                 callbackfn_rbu);
640                         if (req_firm_rc) {
641                                 printk(KERN_ERR
642                                         "dell_rbu:%s request_firmware_nowait"
643                                         " failed %d\n", __FUNCTION__, rc);
644                                 rc = -EIO;
645                         } else
646                                 rbu_data.entry_created = 1;
647
648                         spin_lock(&rbu_data.lock);
649                 }
650         } else {
651                 printk(KERN_WARNING "dell_rbu: image_type is invalid\n");
652                 spin_unlock(&rbu_data.lock);
653                 return -EINVAL;
654         }
655
656         /* we must free all previous allocations */
657         packet_empty_list();
658         img_update_free();
659         spin_unlock(&rbu_data.lock);
660
661         return rc;
662 }
663
664 static ssize_t read_rbu_packet_size(struct kobject *kobj, char *buffer,
665         loff_t pos, size_t count)
666 {
667         int size = 0;
668         if (!pos) {
669                 spin_lock(&rbu_data.lock);
670                 size = sprintf(buffer, "%lu\n", rbu_data.packetsize);
671                 spin_unlock(&rbu_data.lock);
672         }
673         return size;
674 }
675
676 static ssize_t write_rbu_packet_size(struct kobject *kobj, char *buffer,
677         loff_t pos, size_t count)
678 {
679         unsigned long temp;
680         spin_lock(&rbu_data.lock);
681         packet_empty_list();
682         sscanf(buffer, "%lu", &temp);
683         if (temp < 0xffffffff)
684                 rbu_data.packetsize = temp;
685
686         spin_unlock(&rbu_data.lock);
687         return count;
688 }
689
690 static struct bin_attribute rbu_data_attr = {
691         .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
692         .read = read_rbu_data,
693 };
694
695 static struct bin_attribute rbu_image_type_attr = {
696         .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
697         .read = read_rbu_image_type,
698         .write = write_rbu_image_type,
699 };
700
701 static struct bin_attribute rbu_packet_size_attr = {
702         .attr = {.name = "packet_size",.owner = THIS_MODULE,.mode = 0644},
703         .read = read_rbu_packet_size,
704         .write = write_rbu_packet_size,
705 };
706
707 static int __init dcdrbu_init(void)
708 {
709         int rc = 0;
710         spin_lock_init(&rbu_data.lock);
711
712         init_packet_head();
713         rbu_device =
714                 platform_device_register_simple("dell_rbu", -1, NULL, 0);
715         if (!rbu_device) {
716                 printk(KERN_ERR
717                         "dell_rbu:%s:platform_device_register_simple "
718                         "failed\n", __FUNCTION__);
719                 return -EIO;
720         }
721
722         sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
723         sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
724         sysfs_create_bin_file(&rbu_device->dev.kobj,
725                 &rbu_packet_size_attr);
726
727         rbu_data.entry_created = 0;
728         return rc;
729
730 }
731
732 static __exit void dcdrbu_exit(void)
733 {
734         spin_lock(&rbu_data.lock);
735         packet_empty_list();
736         img_update_free();
737         spin_unlock(&rbu_data.lock);
738         platform_device_unregister(rbu_device);
739 }
740
741 module_exit(dcdrbu_exit);
742 module_init(dcdrbu_init);
743
744 /* vim:noet:ts=8:sw=8
745 */