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   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/version.h>
  38 #include <linux/config.h>
  39 #include <linux/init.h>
  40 #include <linux/module.h>
  41 #include <linux/string.h>
  42 #include <linux/errno.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/platform_device.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/firmware.h>
  48 #include <linux/dma-mapping.h>
  49
  50 MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
  51 MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
  52 MODULE_LICENSE("GPL");
  53 MODULE_VERSION("3.0");
  54
  55 #define BIOS_SCAN_LIMIT 0xffffffff
  56 #define MAX_IMAGE_LENGTH 16
  57 static struct _rbu_data {
  58         void *image_update_buffer;
  59         unsigned long image_update_buffer_size;
  60         unsigned long bios_image_size;
  61         int image_update_ordernum;
  62         int dma_alloc;
  63         spinlock_t lock;
  64         unsigned long packet_read_count;
  65         unsigned long num_packets;
  66         unsigned long packetsize;
  67         unsigned long imagesize;
  68         int entry_created;
  69 } rbu_data;
  70
  71 static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
  72 module_param_string(image_type, image_type, sizeof (image_type), 0);
  73 MODULE_PARM_DESC(image_type,
  74         "BIOS image type. choose- mono or packet or init");
  75
  76 struct packet_data {
  77         struct list_head list;
  78         size_t length;
  79         void *data;
  80         int ordernum;
  81 };
  82
  83 static struct packet_data packet_data_head;
  84
  85 static struct platform_device *rbu_device;
  86 static int context;
  87 static dma_addr_t dell_rbu_dmaaddr;
  88
  89 static void init_packet_head(void)
  90 {
  91         INIT_LIST_HEAD(&packet_data_head.list);
  92         rbu_data.packet_read_count = 0;
  93         rbu_data.num_packets = 0;
  94         rbu_data.packetsize = 0;
  95         rbu_data.imagesize = 0;
  96 }
  97
  98 static int create_packet(void *data, size_t length)
  99 {
 100         struct packet_data *newpacket;
 101         int ordernum = 0;
 102
 103         pr_debug("create_packet: entry \n");
 104
 105         if (!rbu_data.packetsize) {
 106                 pr_debug("create_packet: packetsize not specified\n");
 107                 return -EINVAL;
 108         }
 109         spin_unlock(&rbu_data.lock);
 110         newpacket = kmalloc(sizeof (struct packet_data), GFP_KERNEL);
 111         spin_lock(&rbu_data.lock);
 112
 113         if (!newpacket) {
 114                 printk(KERN_WARNING
 115                         "dell_rbu:%s: failed to allocate new "
 116                         "packet\n", __FUNCTION__);
 117                 return -ENOMEM;
 118         }
 119
 120         ordernum = get_order(length);
 121         /*
 122          * there is no upper limit on memory
 123          * address for packetized mechanism
 124          */
 125         spin_unlock(&rbu_data.lock);
 126         newpacket->data = (unsigned char *) __get_free_pages(GFP_KERNEL,
 127                 ordernum);
 128         spin_lock(&rbu_data.lock);
 129
 130         pr_debug("create_packet: newpacket %p\n", newpacket->data);
 131
 132         if (!newpacket->data) {
 133                 printk(KERN_WARNING
 134                         "dell_rbu:%s: failed to allocate new "
 135                         "packet\n", __FUNCTION__);
 136                 kfree(newpacket);
 137                 return -ENOMEM;
 138         }
 139
 140         newpacket->ordernum = ordernum;
 141         ++rbu_data.num_packets;
 142         /*
 143          * initialize the newly created packet headers
 144          */
 145         INIT_LIST_HEAD(&newpacket->list);
 146         list_add_tail(&newpacket->list, &packet_data_head.list);
 147         /*
 148          * packets may not have fixed size
 149          */
 150         newpacket->length = length;
 151
 152         memcpy(newpacket->data, data, length);
 153
 154         pr_debug("create_packet: exit \n");
 155
 156         return 0;
 157 }
 158
 159 static int packetize_data(void *data, size_t length)
 160 {
 161         int rc = 0;
 162         int done = 0;
 163         int packet_length;
 164         u8 *temp;
 165         u8 *end = (u8 *) data + length;
 166         pr_debug("packetize_data: data length %d\n", length);
 167         if (!rbu_data.packetsize) {
 168                 printk(KERN_WARNING
 169                         "dell_rbu: packetsize not specified\n");
 170                 return -EIO;
 171         }
 172
 173         temp = (u8 *) data;
 174
 175         /* packetize the hunk */
 176         while (!done) {
 177                 if ((temp + rbu_data.packetsize) < end)
 178                         packet_length = rbu_data.packetsize;
 179                 else {
 180                         /* this is the last packet */
 181                         packet_length = end - temp;
 182                         done = 1;
 183                 }
 184
 185                 if ((rc = create_packet(temp, packet_length)))
 186                         return rc;
 187
 188                 pr_debug("%lu:%lu\n", temp, (end - temp));
 189                 temp += packet_length;
 190         }
 191
 192         rbu_data.imagesize = length;
 193
 194         return rc;
 195 }
 196
 197 static int do_packet_read(char *data, struct list_head *ptemp_list,
 198         int length, int bytes_read, int *list_read_count)
 199 {
 200         void *ptemp_buf;
 201         struct packet_data *newpacket = NULL;
 202         int bytes_copied = 0;
 203         int j = 0;
 204
 205         newpacket = list_entry(ptemp_list, struct packet_data, list);
 206         *list_read_count += newpacket->length;
 207
 208         if (*list_read_count > bytes_read) {
 209                 /* point to the start of unread data */
 210                 j = newpacket->length - (*list_read_count - bytes_read);
 211                 /* point to the offset in the packet buffer */
 212                 ptemp_buf = (u8 *) newpacket->data + j;
 213                 /*
 214                  * check if there is enough room in
 215                  * * the incoming buffer
 216                  */
 217                 if (length > (*list_read_count - bytes_read))
 218                         /*
 219                          * copy what ever is there in this
 220                          * packet and move on
 221                          */
 222                         bytes_copied = (*list_read_count - bytes_read);
 223                 else
 224                         /* copy the remaining */
 225                         bytes_copied = length;
 226                 memcpy(data, ptemp_buf, bytes_copied);
 227         }
 228         return bytes_copied;
 229 }
 230
 231 static int packet_read_list(char *data, size_t * pread_length)
 232 {
 233         struct list_head *ptemp_list;
 234         int temp_count = 0;
 235         int bytes_copied = 0;
 236         int bytes_read = 0;
 237         int remaining_bytes = 0;
 238         char *pdest = data;
 239
 240         /* check if we have any packets */
 241         if (0 == rbu_data.num_packets)
 242                 return -ENOMEM;
 243
 244         remaining_bytes = *pread_length;
 245         bytes_read = rbu_data.packet_read_count;
 246
 247         ptemp_list = (&packet_data_head.list)->next;
 248         while (!list_empty(ptemp_list)) {
 249                 bytes_copied = do_packet_read(pdest, ptemp_list,
 250                         remaining_bytes, bytes_read, &temp_count);
 251                 remaining_bytes -= bytes_copied;
 252                 bytes_read += bytes_copied;
 253                 pdest += bytes_copied;
 254                 /*
 255                  * check if we reached end of buffer before reaching the
 256                  * last packet
 257                  */
 258                 if (remaining_bytes == 0)
 259                         break;
 260
 261                 ptemp_list = ptemp_list->next;
 262         }
 263         /*finally set the bytes read */
 264         *pread_length = bytes_read - rbu_data.packet_read_count;
 265         rbu_data.packet_read_count = bytes_read;
 266         return 0;
 267 }
 268
 269 static void packet_empty_list(void)
 270 {
 271         struct list_head *ptemp_list;
 272         struct list_head *pnext_list;
 273         struct packet_data *newpacket;
 274
 275         ptemp_list = (&packet_data_head.list)->next;
 276         while (!list_empty(ptemp_list)) {
 277                 newpacket =
 278                         list_entry(ptemp_list, struct packet_data, list);
 279                 pnext_list = ptemp_list->next;
 280                 list_del(ptemp_list);
 281                 ptemp_list = pnext_list;
 282                 /*
 283                  * zero out the RBU packet memory before freeing
 284                  * to make sure there are no stale RBU packets left in memory
 285                  */
 286                 memset(newpacket->data, 0, rbu_data.packetsize);
 287                 free_pages((unsigned long) newpacket->data,
 288                         newpacket->ordernum);
 289                 kfree(newpacket);
 290         }
 291         rbu_data.packet_read_count = 0;
 292         rbu_data.num_packets = 0;
 293         rbu_data.imagesize = 0;
 294 }
 295
 296 /*
 297  * img_update_free: Frees the buffer allocated for storing BIOS image
 298  * Always called with lock held and returned with lock held
 299  */
 300 static void img_update_free(void)
 301 {
 302         if (!rbu_data.image_update_buffer)
 303                 return;
 304         /*
 305          * zero out this buffer before freeing it to get rid of any stale
 306          * BIOS image copied in memory.
 307          */
 308         memset(rbu_data.image_update_buffer, 0,
 309                 rbu_data.image_update_buffer_size);
 310         if (rbu_data.dma_alloc == 1)
 311                 dma_free_coherent(NULL, rbu_data.bios_image_size,
 312                         rbu_data.image_update_buffer, dell_rbu_dmaaddr);
 313         else
 314                 free_pages((unsigned long) rbu_data.image_update_buffer,
 315                         rbu_data.image_update_ordernum);
 316
 317         /*
 318          * Re-initialize the rbu_data variables after a free
 319          */
 320         rbu_data.image_update_ordernum = -1;
 321         rbu_data.image_update_buffer = NULL;
 322         rbu_data.image_update_buffer_size = 0;
 323         rbu_data.bios_image_size = 0;
 324         rbu_data.dma_alloc = 0;
 325 }
 326
 327 /*
 328  * img_update_realloc: This function allocates the contiguous pages to
 329  * accommodate the requested size of data. The memory address and size
 330  * values are stored globally and on every call to this function the new
 331  * size is checked to see if more data is required than the existing size.
 332  * If true the previous memory is freed and new allocation is done to
 333  * accommodate the new size. If the incoming size is less then than the
 334  * already allocated size, then that memory is reused. This function is
 335  * called with lock held and returns with lock held.
 336  */
 337 static int img_update_realloc(unsigned long size)
 338 {
 339         unsigned char *image_update_buffer = NULL;
 340         unsigned long rc;
 341         unsigned long img_buf_phys_addr;
 342         int ordernum;
 343         int dma_alloc = 0;
 344
 345         /*
 346          * check if the buffer of sufficient size has been
 347          * already allocated
 348          */
 349         if (rbu_data.image_update_buffer_size >= size) {
 350                 /*
 351                  * check for corruption
 352                  */
 353                 if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
 354                         printk(KERN_ERR "dell_rbu:%s: corruption "
 355                                 "check failed\n", __FUNCTION__);
 356                         return -EINVAL;
 357                 }
 358                 /*
 359                  * we have a valid pre-allocated buffer with
 360                  * sufficient size
 361                  */
 362                 return 0;
 363         }
 364
 365         /*
 366          * free any previously allocated buffer
 367          */
 368         img_update_free();
 369
 370         spin_unlock(&rbu_data.lock);
 371
 372         ordernum = get_order(size);
 373         image_update_buffer =
 374                 (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);
 375
 376         img_buf_phys_addr =
 377                 (unsigned long) virt_to_phys(image_update_buffer);
 378
 379         if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
 380                 free_pages((unsigned long) image_update_buffer, ordernum);
 381                 ordernum = -1;
 382                 image_update_buffer = dma_alloc_coherent(NULL, size,
 383                         &dell_rbu_dmaaddr, GFP_KERNEL);
 384                 dma_alloc = 1;
 385         }
 386
 387         spin_lock(&rbu_data.lock);
 388
 389         if (image_update_buffer != NULL) {
 390                 rbu_data.image_update_buffer = image_update_buffer;
 391                 rbu_data.image_update_buffer_size = size;
 392                 rbu_data.bios_image_size =
 393                         rbu_data.image_update_buffer_size;
 394                 rbu_data.image_update_ordernum = ordernum;
 395                 rbu_data.dma_alloc = dma_alloc;
 396                 rc = 0;
 397         } else {
 398                 pr_debug("Not enough memory for image update:"
 399                         "size = %ld\n", size);
 400                 rc = -ENOMEM;
 401         }
 402
 403         return rc;
 404 }
 405
 406 static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
 407 {
 408         int retval;
 409         size_t bytes_left;
 410         size_t data_length;
 411         char *ptempBuf = buffer;
 412
 413         /* check to see if we have something to return */
 414         if (rbu_data.num_packets == 0) {
 415                 pr_debug("read_packet_data: no packets written\n");
 416                 retval = -ENOMEM;
 417                 goto read_rbu_data_exit;
 418         }
 419
 420         if (pos > rbu_data.imagesize) {
 421                 retval = 0;
 422                 printk(KERN_WARNING "dell_rbu:read_packet_data: "
 423                         "data underrun\n");
 424                 goto read_rbu_data_exit;
 425         }
 426
 427         bytes_left = rbu_data.imagesize - pos;
 428         data_length = min(bytes_left, count);
 429
 430         if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
 431                 goto read_rbu_data_exit;
 432
 433         if ((pos + count) > rbu_data.imagesize) {
 434                 rbu_data.packet_read_count = 0;
 435                 /* this was the last copy */
 436                 retval = bytes_left;
 437         } else
 438                 retval = count;
 439
 440       read_rbu_data_exit:
 441         return retval;
 442 }
 443
 444 static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
 445 {
 446         unsigned char *ptemp = NULL;
 447         size_t bytes_left = 0;
 448         size_t data_length = 0;
 449         ssize_t ret_count = 0;
 450
 451         /* check to see if we have something to return */
 452         if ((rbu_data.image_update_buffer == NULL) ||
 453                 (rbu_data.bios_image_size == 0)) {
 454                 pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
 455                         "bios_image_size %lu\n",
 456                         rbu_data.image_update_buffer,
 457                         rbu_data.bios_image_size);
 458                 ret_count = -ENOMEM;
 459                 goto read_rbu_data_exit;
 460         }
 461
 462         if (pos > rbu_data.bios_image_size) {
 463                 ret_count = 0;
 464                 goto read_rbu_data_exit;
 465         }
 466
 467         bytes_left = rbu_data.bios_image_size - pos;
 468         data_length = min(bytes_left, count);
 469
 470         ptemp = rbu_data.image_update_buffer;
 471         memcpy(buffer, (ptemp + pos), data_length);
 472
 473         if ((pos + count) > rbu_data.bios_image_size)
 474                 /* this was the last copy */
 475                 ret_count = bytes_left;
 476         else
 477                 ret_count = count;
 478       read_rbu_data_exit:
 479         return ret_count;
 480 }
 481
 482 static ssize_t read_rbu_data(struct kobject *kobj, char *buffer,
 483         loff_t pos, size_t count)
 484 {
 485         ssize_t ret_count = 0;
 486
 487         spin_lock(&rbu_data.lock);
 488
 489         if (!strcmp(image_type, "mono"))
 490                 ret_count = read_rbu_mono_data(buffer, pos, count);
 491         else if (!strcmp(image_type, "packet"))
 492                 ret_count = read_packet_data(buffer, pos, count);
 493         else
 494                 pr_debug("read_rbu_data: invalid image type specified\n");
 495
 496         spin_unlock(&rbu_data.lock);
 497         return ret_count;
 498 }
 499
 500 static void callbackfn_rbu(const struct firmware *fw, void *context)
 501 {
 502         int rc = 0;
 503
 504         if (!fw || !fw->size) {
 505                 rbu_data.entry_created = 0;
 506                 return;
 507         }
 508
 509         spin_lock(&rbu_data.lock);
 510         if (!strcmp(image_type, "mono")) {
 511                 if (!img_update_realloc(fw->size))
 512                         memcpy(rbu_data.image_update_buffer,
 513                                 fw->data, fw->size);
 514         } else if (!strcmp(image_type, "packet")) {
 515                 /*
 516                  * we need to free previous packets if a
 517                  * new hunk of packets needs to be downloaded
 518                  */
 519                 packet_empty_list();
 520                 if (packetize_data(fw->data, fw->size))
 521                         /* Incase something goes wrong when we are
 522                          * in middle of packetizing the data, we
 523                          * need to free up whatever packets might
 524                          * have been created before we quit.
 525                          */
 526                         packet_empty_list();
 527         } else
 528                 pr_debug("invalid image type specified.\n");
 529         spin_unlock(&rbu_data.lock);
 530
 531         rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
 532                 "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu);
 533         if (rc)
 534                 printk(KERN_ERR
 535                         "dell_rbu:%s request_firmware_nowait failed"
 536                         " %d\n", __FUNCTION__, rc);
 537         else
 538                 rbu_data.entry_created = 1;
 539 }
 540
 541 static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer,
 542         loff_t pos, size_t count)
 543 {
 544         int size = 0;
 545         if (!pos)
 546                 size = sprintf(buffer, "%s\n", image_type);
 547         return size;
 548 }
 549
 550 static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer,
 551         loff_t pos, size_t count)
 552 {
 553         int rc = count;
 554         int req_firm_rc = 0;
 555         int i;
 556         spin_lock(&rbu_data.lock);
 557         /*
 558          * Find the first newline or space
 559          */
 560         for (i = 0; i < count; ++i)
 561                 if (buffer[i] == '\n' || buffer[i] == ' ') {
 562                         buffer[i] = '\0';
 563                         break;
 564                 }
 565         if (i == count)
 566                 buffer[count] = '\0';
 567
 568         if (strstr(buffer, "mono"))
 569                 strcpy(image_type, "mono");
 570         else if (strstr(buffer, "packet"))
 571                 strcpy(image_type, "packet");
 572         else if (strstr(buffer, "init")) {
 573                 /*
 574                  * If due to the user error the driver gets in a bad
 575                  * state where even though it is loaded , the
 576                  * /sys/class/firmware/dell_rbu entries are missing.
 577                  * to cover this situation the user can recreate entries
 578                  * by writing init to image_type.
 579                  */
 580                 if (!rbu_data.entry_created) {
 581                         spin_unlock(&rbu_data.lock);
 582                         req_firm_rc = request_firmware_nowait(THIS_MODULE,
 583                                 FW_ACTION_NOHOTPLUG, "dell_rbu",
 584                                 &rbu_device->dev, &context,
 585                                 callbackfn_rbu);
 586                         if (req_firm_rc) {
 587                                 printk(KERN_ERR
 588                                         "dell_rbu:%s request_firmware_nowait"
 589                                         " failed %d\n", __FUNCTION__, rc);
 590                                 rc = -EIO;
 591                         } else
 592                                 rbu_data.entry_created = 1;
 593
 594                         spin_lock(&rbu_data.lock);
 595                 }
 596         } else {
 597                 printk(KERN_WARNING "dell_rbu: image_type is invalid\n");
 598                 spin_unlock(&rbu_data.lock);
 599                 return -EINVAL;
 600         }
 601
 602         /* we must free all previous allocations */
 603         packet_empty_list();
 604         img_update_free();
 605         spin_unlock(&rbu_data.lock);
 606
 607         return rc;
 608 }
 609
 610 static ssize_t read_rbu_packet_size(struct kobject *kobj, char *buffer,
 611         loff_t pos, size_t count)
 612 {
 613         int size = 0;
 614         if (!pos) {
 615                 spin_lock(&rbu_data.lock);
 616                 size = sprintf(buffer, "%lu\n", rbu_data.packetsize);
 617                 spin_unlock(&rbu_data.lock);
 618         }
 619         return size;
 620 }
 621
 622 static ssize_t write_rbu_packet_size(struct kobject *kobj, char *buffer,
 623         loff_t pos, size_t count)
 624 {
 625         unsigned long temp;
 626         spin_lock(&rbu_data.lock);
 627         packet_empty_list();
 628         sscanf(buffer, "%lu", &temp);
 629         if (temp < 0xffffffff)
 630                 rbu_data.packetsize = temp;
 631
 632         spin_unlock(&rbu_data.lock);
 633         return count;
 634 }
 635
 636 static struct bin_attribute rbu_data_attr = {
 637         .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
 638         .read = read_rbu_data,
 639 };
 640
 641 static struct bin_attribute rbu_image_type_attr = {
 642         .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
 643         .read = read_rbu_image_type,
 644         .write = write_rbu_image_type,
 645 };
 646
 647 static struct bin_attribute rbu_packet_size_attr = {
 648         .attr = {.name = "packet_size",.owner = THIS_MODULE,.mode = 0644},
 649         .read = read_rbu_packet_size,
 650         .write = write_rbu_packet_size,
 651 };
 652
 653 static int __init dcdrbu_init(void)
 654 {
 655         int rc = 0;
 656         spin_lock_init(&rbu_data.lock);
 657
 658         init_packet_head();
 659         rbu_device =
 660                 platform_device_register_simple("dell_rbu", -1, NULL, 0);
 661         if (!rbu_device) {
 662                 printk(KERN_ERR
 663                         "dell_rbu:%s:platform_device_register_simple "
 664                         "failed\n", __FUNCTION__);
 665                 return -EIO;
 666         }
 667
 668         sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
 669         sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
 670         sysfs_create_bin_file(&rbu_device->dev.kobj,
 671                 &rbu_packet_size_attr);
 672
 673         rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
 674                 "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu);
 675         if (rc)
 676                 printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait"
 677                         " failed %d\n", __FUNCTION__, rc);
 678         else
 679                 rbu_data.entry_created = 1;
 680
 681         return rc;
 682
 683 }
 684
 685 static __exit void dcdrbu_exit(void)
 686 {
 687         spin_lock(&rbu_data.lock);
 688         packet_empty_list();
 689         img_update_free();
 690         spin_unlock(&rbu_data.lock);
 691         platform_device_unregister(rbu_device);
 692 }
 693
 694 module_exit(dcdrbu_exit);
 695 module_init(dcdrbu_init);