drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/errno.h>
  27 #include <linux/hdreg.h>
  28 #include <linux/kdev_t.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/mutex.h>
  31 #include <linux/scatterlist.h>
  32 #include <linux/string_helpers.h>
  33
  34 #include <linux/mmc/card.h>
  35 #include <linux/mmc/host.h>
  36 #include <linux/mmc/mmc.h>
  37 #include <linux/mmc/sd.h>
  38
  39 #include <asm/system.h>
  40 #include <asm/uaccess.h>
  41
  42 #include "queue.h"
  43
  44 MODULE_ALIAS("mmc:block");
  45
  46 /*
  47  * max 8 partitions per card
  48  */
  49 #define MMC_SHIFT       3
  50 #define MMC_NUM_MINORS  (256 >> MMC_SHIFT)
  51
  52 static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
  53
  54 /*
  55  * There is one mmc_blk_data per slot.
  56  */
  57 struct mmc_blk_data {
  58         spinlock_t      lock;
  59         struct gendisk  *disk;
  60         struct mmc_queue queue;
  61
  62         unsigned int    usage;
  63         unsigned int    read_only;
  64 };
  65
  66 static DEFINE_MUTEX(open_lock);
  67
  68 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
  69 {
  70         struct mmc_blk_data *md;
  71
  72         mutex_lock(&open_lock);
  73         md = disk->private_data;
  74         if (md && md->usage == 0)
  75                 md = NULL;
  76         if (md)
  77                 md->usage++;
  78         mutex_unlock(&open_lock);
  79
  80         return md;
  81 }
  82
  83 static void mmc_blk_put(struct mmc_blk_data *md)
  84 {
  85         mutex_lock(&open_lock);
  86         md->usage--;
  87         if (md->usage == 0) {
  88                 int devmaj = MAJOR(disk_devt(md->disk));
  89                 int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
  90
  91                 if (!devmaj)
  92                         devidx = md->disk->first_minor >> MMC_SHIFT;
  93
  94                 __clear_bit(devidx, dev_use);
  95
  96                 put_disk(md->disk);
  97                 kfree(md);
  98         }
  99         mutex_unlock(&open_lock);
 100 }
 101
 102 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 103 {
 104         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 105         int ret = -ENXIO;
 106
 107         if (md) {
 108                 if (md->usage == 2)
 109                         check_disk_change(bdev);
 110                 ret = 0;
 111
 112                 if ((mode & FMODE_WRITE) && md->read_only) {
 113                         mmc_blk_put(md);
 114                         ret = -EROFS;
 115                 }
 116         }
 117
 118         return ret;
 119 }
 120
 121 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 122 {
 123         struct mmc_blk_data *md = disk->private_data;
 124
 125         mmc_blk_put(md);
 126         return 0;
 127 }
 128
 129 static int
 130 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 131 {
 132         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 133         geo->heads = 4;
 134         geo->sectors = 16;
 135         return 0;
 136 }
 137
 138 static const struct block_device_operations mmc_bdops = {
 139         .open                   = mmc_blk_open,
 140         .release                = mmc_blk_release,
 141         .getgeo                 = mmc_blk_getgeo,
 142         .owner                  = THIS_MODULE,
 143 };
 144
 145 struct mmc_blk_request {
 146         struct mmc_request      mrq;
 147         struct mmc_command      cmd;
 148         struct mmc_command      stop;
 149         struct mmc_data         data;
 150 };
 151
 152 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 153 {
 154         int err;
 155         u32 result;
 156         __be32 *blocks;
 157
 158         struct mmc_request mrq;
 159         struct mmc_command cmd;
 160         struct mmc_data data;
 161         unsigned int timeout_us;
 162
 163         struct scatterlist sg;
 164
 165         memset(&cmd, 0, sizeof(struct mmc_command));
 166
 167         cmd.opcode = MMC_APP_CMD;
 168         cmd.arg = card->rca << 16;
 169         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 170
 171         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 172         if (err)
 173                 return (u32)-1;
 174         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 175                 return (u32)-1;
 176
 177         memset(&cmd, 0, sizeof(struct mmc_command));
 178
 179         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 180         cmd.arg = 0;
 181         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 182
 183         memset(&data, 0, sizeof(struct mmc_data));
 184
 185         data.timeout_ns = card->csd.tacc_ns * 100;
 186         data.timeout_clks = card->csd.tacc_clks * 100;
 187
 188         timeout_us = data.timeout_ns / 1000;
 189         timeout_us += data.timeout_clks * 1000 /
 190                 (card->host->ios.clock / 1000);
 191
 192         if (timeout_us > 100000) {
 193                 data.timeout_ns = 100000000;
 194                 data.timeout_clks = 0;
 195         }
 196
 197         data.blksz = 4;
 198         data.blocks = 1;
 199         data.flags = MMC_DATA_READ;
 200         data.sg = &sg;
 201         data.sg_len = 1;
 202
 203         memset(&mrq, 0, sizeof(struct mmc_request));
 204
 205         mrq.cmd = &cmd;
 206         mrq.data = &data;
 207
 208         blocks = kmalloc(4, GFP_KERNEL);
 209         if (!blocks)
 210                 return (u32)-1;
 211
 212         sg_init_one(&sg, blocks, 4);
 213
 214         mmc_wait_for_req(card->host, &mrq);
 215
 216         result = ntohl(*blocks);
 217         kfree(blocks);
 218
 219         if (cmd.error || data.error)
 220                 result = (u32)-1;
 221
 222         return result;
 223 }
 224
 225 static u32 get_card_status(struct mmc_card *card, struct request *req)
 226 {
 227         struct mmc_command cmd;
 228         int err;
 229
 230         memset(&cmd, 0, sizeof(struct mmc_command));
 231         cmd.opcode = MMC_SEND_STATUS;
 232         if (!mmc_host_is_spi(card->host))
 233                 cmd.arg = card->rca << 16;
 234         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 235         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 236         if (err)
 237                 printk(KERN_ERR "%s: error %d sending status comand",
 238                        req->rq_disk->disk_name, err);
 239         return cmd.resp[0];
 240 }
 241
 242 static int
 243 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 244 {
 245         struct mmc_command cmd;
 246         int err;
 247
 248         /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
 249         if (mmc_card_blockaddr(card))
 250                 return 0;
 251
 252         mmc_claim_host(card->host);
 253         cmd.opcode = MMC_SET_BLOCKLEN;
 254         cmd.arg = 512;
 255         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 256         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 257         mmc_release_host(card->host);
 258
 259         if (err) {
 260                 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
 261                         md->disk->disk_name, cmd.arg, err);
 262                 return -EINVAL;
 263         }
 264
 265         return 0;
 266 }
 267
 268
 269 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 270 {
 271         struct mmc_blk_data *md = mq->data;
 272         struct mmc_card *card = md->queue.card;
 273         struct mmc_blk_request brq;
 274         int ret = 1, disable_multi = 0;
 275
 276 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 277         if (mmc_bus_needs_resume(card->host)) {
 278                 mmc_resume_bus(card->host);
 279                 mmc_blk_set_blksize(md, card);
 280         }
 281 #endif
 282
 283         mmc_claim_host(card->host);
 284
 285         do {
 286                 struct mmc_command cmd;
 287                 u32 readcmd, writecmd, status = 0;
 288
 289                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 290                 brq.mrq.cmd = &brq.cmd;
 291                 brq.mrq.data = &brq.data;
 292
 293                 brq.cmd.arg = blk_rq_pos(req);
 294                 if (!mmc_card_blockaddr(card))
 295                         brq.cmd.arg <<= 9;
 296                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 297                 brq.data.blksz = 512;
 298                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 299                 brq.stop.arg = 0;
 300                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 301                 brq.data.blocks = blk_rq_sectors(req);
 302
 303                 /*
 304                  * The block layer doesn't support all sector count
 305                  * restrictions, so we need to be prepared for too big
 306                  * requests.
 307                  */
 308                 if (brq.data.blocks > card->host->max_blk_count)
 309                         brq.data.blocks = card->host->max_blk_count;
 310
 311                 /*
 312                  * After a read error, we redo the request one sector at a time
 313                  * in order to accurately determine which sectors can be read
 314                  * successfully.
 315                  */
 316                 if (disable_multi && brq.data.blocks > 1)
 317                         brq.data.blocks = 1;
 318
 319                 if (brq.data.blocks > 1) {
 320                         /* SPI multiblock writes terminate using a special
 321                          * token, not a STOP_TRANSMISSION request.
 322                          */
 323                         if (!mmc_host_is_spi(card->host)
 324                                         || rq_data_dir(req) == READ)
 325                                 brq.mrq.stop = &brq.stop;
 326                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 327                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 328                 } else {
 329                         brq.mrq.stop = NULL;
 330                         readcmd = MMC_READ_SINGLE_BLOCK;
 331                         writecmd = MMC_WRITE_BLOCK;
 332                 }
 333
 334                 if (rq_data_dir(req) == READ) {
 335                         brq.cmd.opcode = readcmd;
 336                         brq.data.flags |= MMC_DATA_READ;
 337                 } else {
 338                         brq.cmd.opcode = writecmd;
 339                         brq.data.flags |= MMC_DATA_WRITE;
 340                 }
 341
 342                 mmc_set_data_timeout(&brq.data, card);
 343
 344                 brq.data.sg = mq->sg;
 345                 brq.data.sg_len = mmc_queue_map_sg(mq);
 346
 347                 /*
 348                  * Adjust the sg list so it is the same size as the
 349                  * request.
 350                  */
 351                 if (brq.data.blocks != blk_rq_sectors(req)) {
 352                         int i, data_size = brq.data.blocks << 9;
 353                         struct scatterlist *sg;
 354
 355                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 356                                 data_size -= sg->length;
 357                                 if (data_size <= 0) {
 358                                         sg->length += data_size;
 359                                         i++;
 360                                         break;
 361                                 }
 362                         }
 363                         brq.data.sg_len = i;
 364                 }
 365
 366                 mmc_queue_bounce_pre(mq);
 367
 368                 mmc_wait_for_req(card->host, &brq.mrq);
 369
 370                 mmc_queue_bounce_post(mq);
 371
 372                 /*
 373                  * Check for errors here, but don't jump to cmd_err
 374                  * until later as we need to wait for the card to leave
 375                  * programming mode even when things go wrong.
 376                  */
 377                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 378                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 379                                 /* Redo read one sector at a time */
 380                                 printk(KERN_WARNING "%s: retrying using single "
 381                                        "block read\n", req->rq_disk->disk_name);
 382                                 disable_multi = 1;
 383                                 continue;
 384                         }
 385                         status = get_card_status(card, req);
 386                 } else if (disable_multi == 1) {
 387                         disable_multi = 0;
 388                 }
 389
 390                 if (brq.cmd.error) {
 391                         printk(KERN_ERR "%s: error %d sending read/write "
 392                                "command, response %#x, card status %#x\n",
 393                                req->rq_disk->disk_name, brq.cmd.error,
 394                                brq.cmd.resp[0], status);
 395                 }
 396
 397                 if (brq.data.error) {
 398                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 399                                 /* 'Stop' response contains card status */
 400                                 status = brq.mrq.stop->resp[0];
 401                         printk(KERN_ERR "%s: error %d transferring data,"
 402                                " sector %u, nr %u, card status %#x\n",
 403                                req->rq_disk->disk_name, brq.data.error,
 404                                (unsigned)blk_rq_pos(req),
 405                                (unsigned)blk_rq_sectors(req), status);
 406                 }
 407
 408                 if (brq.stop.error) {
 409                         printk(KERN_ERR "%s: error %d sending stop command, "
 410                                "response %#x, card status %#x\n",
 411                                req->rq_disk->disk_name, brq.stop.error,
 412                                brq.stop.resp[0], status);
 413                 }
 414
 415                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 416                         do {
 417                                 int err;
 418
 419                                 cmd.opcode = MMC_SEND_STATUS;
 420                                 cmd.arg = card->rca << 16;
 421                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 422                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 423                                 if (err) {
 424                                         printk(KERN_ERR "%s: error %d requesting status\n",
 425                                                req->rq_disk->disk_name, err);
 426                                         goto cmd_err;
 427                                 }
 428                                 /*
 429                                  * Some cards mishandle the status bits,
 430                                  * so make sure to check both the busy
 431                                  * indication and the card state.
 432                                  */
 433                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 434                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 435
 436 #if 0
 437                         if (cmd.resp[0] & ~0x00000900)
 438                                 printk(KERN_ERR "%s: status = %08x\n",
 439                                        req->rq_disk->disk_name, cmd.resp[0]);
 440                         if (mmc_decode_status(cmd.resp))
 441                                 goto cmd_err;
 442 #endif
 443                 }
 444
 445                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 446                         if (rq_data_dir(req) == READ) {
 447                                 /*
 448                                  * After an error, we redo I/O one sector at a
 449                                  * time, so we only reach here after trying to
 450                                  * read a single sector.
 451                                  */
 452                                 spin_lock_irq(&md->lock);
 453                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 454                                 spin_unlock_irq(&md->lock);
 455                                 continue;
 456                         }
 457                         goto cmd_err;
 458                 }
 459
 460                 /*
 461                  * A block was successfully transferred.
 462                  */
 463                 spin_lock_irq(&md->lock);
 464                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 465                 spin_unlock_irq(&md->lock);
 466         } while (ret);
 467
 468         mmc_release_host(card->host);
 469
 470         return 1;
 471
 472  cmd_err:
 473         /*
 474          * If this is an SD card and we're writing, we can first
 475          * mark the known good sectors as ok.
 476          *
 477          * If the card is not SD, we can still ok written sectors
 478          * as reported by the controller (which might be less than
 479          * the real number of written sectors, but never more).
 480          */
 481         if (mmc_card_sd(card)) {
 482                 u32 blocks;
 483
 484                 blocks = mmc_sd_num_wr_blocks(card);
 485                 if (blocks != (u32)-1) {
 486                         spin_lock_irq(&md->lock);
 487                         ret = __blk_end_request(req, 0, blocks << 9);
 488                         spin_unlock_irq(&md->lock);
 489                 }
 490         } else {
 491                 spin_lock_irq(&md->lock);
 492                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 493                 spin_unlock_irq(&md->lock);
 494         }
 495
 496         mmc_release_host(card->host);
 497
 498         spin_lock_irq(&md->lock);
 499         while (ret)
 500                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 501         spin_unlock_irq(&md->lock);
 502
 503         return 0;
 504 }
 505
 506
 507 static inline int mmc_blk_readonly(struct mmc_card *card)
 508 {
 509         return mmc_card_readonly(card) ||
 510                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
 511 }
 512
 513 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 514 {
 515         struct mmc_blk_data *md;
 516         int devidx, ret;
 517
 518         devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
 519         if (devidx >= MMC_NUM_MINORS)
 520                 return ERR_PTR(-ENOSPC);
 521         __set_bit(devidx, dev_use);
 522
 523         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 524         if (!md) {
 525                 ret = -ENOMEM;
 526                 goto out;
 527         }
 528
 529
 530         /*
 531          * Set the read-only status based on the supported commands
 532          * and the write protect switch.
 533          */
 534         md->read_only = mmc_blk_readonly(card);
 535
 536         md->disk = alloc_disk(1 << MMC_SHIFT);
 537         if (md->disk == NULL) {
 538                 ret = -ENOMEM;
 539                 goto err_kfree;
 540         }
 541
 542         spin_lock_init(&md->lock);
 543         md->usage = 1;
 544
 545         ret = mmc_init_queue(&md->queue, card, &md->lock);
 546         if (ret)
 547                 goto err_putdisk;
 548
 549         md->queue.issue_fn = mmc_blk_issue_rq;
 550         md->queue.data = md;
 551
 552         md->disk->major = MMC_BLOCK_MAJOR;
 553         md->disk->first_minor = devidx << MMC_SHIFT;
 554         md->disk->fops = &mmc_bdops;
 555         md->disk->private_data = md;
 556         md->disk->queue = md->queue.queue;
 557         md->disk->driverfs_dev = &card->dev;
 558
 559         /*
 560          * As discussed on lkml, GENHD_FL_REMOVABLE should:
 561          *
 562          * - be set for removable media with permanent block devices
 563          * - be unset for removable block devices with permanent media
 564          *
 565          * Since MMC block devices clearly fall under the second
 566          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 567          * should use the block device creation/destruction hotplug
 568          * messages to tell when the card is present.
 569          */
 570
 571         sprintf(md->disk->disk_name, "mmcblk%d", devidx);
 572
 573         blk_queue_logical_block_size(md->queue.queue, 512);
 574
 575         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
 576                 /*
 577                  * The EXT_CSD sector count is in number or 512 byte
 578                  * sectors.
 579                  */
 580                 set_capacity(md->disk, card->ext_csd.sectors);
 581         } else {
 582                 /*
 583                  * The CSD capacity field is in units of read_blkbits.
 584                  * set_capacity takes units of 512 bytes.
 585                  */
 586                 set_capacity(md->disk,
 587                         card->csd.capacity << (card->csd.read_blkbits - 9));
 588         }
 589         return md;
 590
 591  err_putdisk:
 592         put_disk(md->disk);
 593  err_kfree:
 594         kfree(md);
 595  out:
 596         return ERR_PTR(ret);
 597 }
 598
 599 static int mmc_blk_probe(struct mmc_card *card)
 600 {
 601         struct mmc_blk_data *md;
 602         int err;
 603
 604         char cap_str[10];
 605
 606         /*
 607          * Check that the card supports the command class(es) we need.
 608          */
 609         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 610                 return -ENODEV;
 611
 612         md = mmc_blk_alloc(card);
 613         if (IS_ERR(md))
 614                 return PTR_ERR(md);
 615
 616         err = mmc_blk_set_blksize(md, card);
 617         if (err)
 618                 goto out;
 619
 620         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 621                         cap_str, sizeof(cap_str));
 622         printk(KERN_INFO "%s: %s %s %s %s\n",
 623                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 624                 cap_str, md->read_only ? "(ro)" : "");
 625
 626         mmc_set_drvdata(card, md);
 627 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 628         mmc_set_bus_resume_policy(card->host, 1);
 629 #endif
 630         add_disk(md->disk);
 631         return 0;
 632
 633  out:
 634         mmc_cleanup_queue(&md->queue);
 635         mmc_blk_put(md);
 636
 637         return err;
 638 }
 639
 640 static void mmc_blk_remove(struct mmc_card *card)
 641 {
 642         struct mmc_blk_data *md = mmc_get_drvdata(card);
 643
 644         if (md) {
 645                 /* Stop new requests from getting into the queue */
 646                 del_gendisk(md->disk);
 647
 648                 /* Then flush out any already in there */
 649                 mmc_cleanup_queue(&md->queue);
 650
 651                 mmc_blk_put(md);
 652         }
 653         mmc_set_drvdata(card, NULL);
 654 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 655         mmc_set_bus_resume_policy(card->host, 0);
 656 #endif
 657 }
 658
 659 #ifdef CONFIG_PM
 660 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 661 {
 662         struct mmc_blk_data *md = mmc_get_drvdata(card);
 663
 664         if (md) {
 665                 mmc_queue_suspend(&md->queue);
 666         }
 667         return 0;
 668 }
 669
 670 static int mmc_blk_resume(struct mmc_card *card)
 671 {
 672         struct mmc_blk_data *md = mmc_get_drvdata(card);
 673
 674         if (md) {
 675 #ifndef CONFIG_MMC_BLOCK_DEFERRED_RESUME
 676                 mmc_blk_set_blksize(md, card);
 677 #endif
 678                 mmc_queue_resume(&md->queue);
 679         }
 680         return 0;
 681 }
 682 #else
 683 #define mmc_blk_suspend NULL
 684 #define mmc_blk_resume  NULL
 685 #endif
 686
 687 static struct mmc_driver mmc_driver = {
 688         .drv            = {
 689                 .name   = "mmcblk",
 690         },
 691         .probe          = mmc_blk_probe,
 692         .remove         = mmc_blk_remove,
 693         .suspend        = mmc_blk_suspend,
 694         .resume         = mmc_blk_resume,
 695 };
 696
 697 static int __init mmc_blk_init(void)
 698 {
 699         int res;
 700
 701         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
 702         if (res)
 703                 goto out;
 704
 705         res = mmc_register_driver(&mmc_driver);
 706         if (res)
 707                 goto out2;
 708
 709         return 0;
 710  out2:
 711         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 712  out:
 713         return res;
 714 }
 715
 716 static void __exit mmc_blk_exit(void)
 717 {
 718         mmc_unregister_driver(&mmc_driver);
 719         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 720 }
 721
 722 module_init(mmc_blk_init);
 723 module_exit(mmc_blk_exit);
 724
 725 MODULE_LICENSE("GPL");
 726 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
 727