git.oblomov.eu Git - linux-2.6/blob - 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 */