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