mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Alexey Dobriyan](/assets/img/avatar_default.png)
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
703 lines
16 KiB
C
703 lines
16 KiB
C
/*
|
|
* Block driver for media (i.e., flash cards)
|
|
*
|
|
* Copyright 2002 Hewlett-Packard Company
|
|
* Copyright 2005-2008 Pierre Ossman
|
|
*
|
|
* Use consistent with the GNU GPL is permitted,
|
|
* provided that this copyright notice is
|
|
* preserved in its entirety in all copies and derived works.
|
|
*
|
|
* HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
|
|
* AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
|
|
* FITNESS FOR ANY PARTICULAR PURPOSE.
|
|
*
|
|
* Many thanks to Alessandro Rubini and Jonathan Corbet!
|
|
*
|
|
* Author: Andrew Christian
|
|
* 28 May 2002
|
|
*/
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/hdreg.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/string_helpers.h>
|
|
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/mmc.h>
|
|
#include <linux/mmc/sd.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "queue.h"
|
|
|
|
MODULE_ALIAS("mmc:block");
|
|
|
|
/*
|
|
* max 8 partitions per card
|
|
*/
|
|
#define MMC_SHIFT 3
|
|
#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
|
|
|
|
static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
|
|
|
|
/*
|
|
* There is one mmc_blk_data per slot.
|
|
*/
|
|
struct mmc_blk_data {
|
|
spinlock_t lock;
|
|
struct gendisk *disk;
|
|
struct mmc_queue queue;
|
|
|
|
unsigned int usage;
|
|
unsigned int read_only;
|
|
};
|
|
|
|
static DEFINE_MUTEX(open_lock);
|
|
|
|
static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
|
|
mutex_lock(&open_lock);
|
|
md = disk->private_data;
|
|
if (md && md->usage == 0)
|
|
md = NULL;
|
|
if (md)
|
|
md->usage++;
|
|
mutex_unlock(&open_lock);
|
|
|
|
return md;
|
|
}
|
|
|
|
static void mmc_blk_put(struct mmc_blk_data *md)
|
|
{
|
|
mutex_lock(&open_lock);
|
|
md->usage--;
|
|
if (md->usage == 0) {
|
|
int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
|
|
__clear_bit(devidx, dev_use);
|
|
|
|
put_disk(md->disk);
|
|
kfree(md);
|
|
}
|
|
mutex_unlock(&open_lock);
|
|
}
|
|
|
|
static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
|
|
int ret = -ENXIO;
|
|
|
|
if (md) {
|
|
if (md->usage == 2)
|
|
check_disk_change(bdev);
|
|
ret = 0;
|
|
|
|
if ((mode & FMODE_WRITE) && md->read_only) {
|
|
mmc_blk_put(md);
|
|
ret = -EROFS;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct mmc_blk_data *md = disk->private_data;
|
|
|
|
mmc_blk_put(md);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
|
|
geo->heads = 4;
|
|
geo->sectors = 16;
|
|
return 0;
|
|
}
|
|
|
|
static const struct block_device_operations mmc_bdops = {
|
|
.open = mmc_blk_open,
|
|
.release = mmc_blk_release,
|
|
.getgeo = mmc_blk_getgeo,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
struct mmc_blk_request {
|
|
struct mmc_request mrq;
|
|
struct mmc_command cmd;
|
|
struct mmc_command stop;
|
|
struct mmc_data data;
|
|
};
|
|
|
|
static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
u32 result;
|
|
__be32 *blocks;
|
|
|
|
struct mmc_request mrq;
|
|
struct mmc_command cmd;
|
|
struct mmc_data data;
|
|
unsigned int timeout_us;
|
|
|
|
struct scatterlist sg;
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
|
|
cmd.opcode = MMC_APP_CMD;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err)
|
|
return (u32)-1;
|
|
if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
|
|
return (u32)-1;
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
|
|
cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
|
|
memset(&data, 0, sizeof(struct mmc_data));
|
|
|
|
data.timeout_ns = card->csd.tacc_ns * 100;
|
|
data.timeout_clks = card->csd.tacc_clks * 100;
|
|
|
|
timeout_us = data.timeout_ns / 1000;
|
|
timeout_us += data.timeout_clks * 1000 /
|
|
(card->host->ios.clock / 1000);
|
|
|
|
if (timeout_us > 100000) {
|
|
data.timeout_ns = 100000000;
|
|
data.timeout_clks = 0;
|
|
}
|
|
|
|
data.blksz = 4;
|
|
data.blocks = 1;
|
|
data.flags = MMC_DATA_READ;
|
|
data.sg = &sg;
|
|
data.sg_len = 1;
|
|
|
|
memset(&mrq, 0, sizeof(struct mmc_request));
|
|
|
|
mrq.cmd = &cmd;
|
|
mrq.data = &data;
|
|
|
|
blocks = kmalloc(4, GFP_KERNEL);
|
|
if (!blocks)
|
|
return (u32)-1;
|
|
|
|
sg_init_one(&sg, blocks, 4);
|
|
|
|
mmc_wait_for_req(card->host, &mrq);
|
|
|
|
result = ntohl(*blocks);
|
|
kfree(blocks);
|
|
|
|
if (cmd.error || data.error)
|
|
result = (u32)-1;
|
|
|
|
return result;
|
|
}
|
|
|
|
static u32 get_card_status(struct mmc_card *card, struct request *req)
|
|
{
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
cmd.opcode = MMC_SEND_STATUS;
|
|
if (!mmc_host_is_spi(card->host))
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err)
|
|
printk(KERN_ERR "%s: error %d sending status comand",
|
|
req->rq_disk->disk_name, err);
|
|
return cmd.resp[0];
|
|
}
|
|
|
|
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_blk_data *md = mq->data;
|
|
struct mmc_card *card = md->queue.card;
|
|
struct mmc_blk_request brq;
|
|
int ret = 1, disable_multi = 0;
|
|
|
|
mmc_claim_host(card->host);
|
|
|
|
do {
|
|
struct mmc_command cmd;
|
|
u32 readcmd, writecmd, status = 0;
|
|
|
|
memset(&brq, 0, sizeof(struct mmc_blk_request));
|
|
brq.mrq.cmd = &brq.cmd;
|
|
brq.mrq.data = &brq.data;
|
|
|
|
brq.cmd.arg = blk_rq_pos(req);
|
|
if (!mmc_card_blockaddr(card))
|
|
brq.cmd.arg <<= 9;
|
|
brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
brq.data.blksz = 512;
|
|
brq.stop.opcode = MMC_STOP_TRANSMISSION;
|
|
brq.stop.arg = 0;
|
|
brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
|
|
brq.data.blocks = blk_rq_sectors(req);
|
|
|
|
/*
|
|
* The block layer doesn't support all sector count
|
|
* restrictions, so we need to be prepared for too big
|
|
* requests.
|
|
*/
|
|
if (brq.data.blocks > card->host->max_blk_count)
|
|
brq.data.blocks = card->host->max_blk_count;
|
|
|
|
/*
|
|
* After a read error, we redo the request one sector at a time
|
|
* in order to accurately determine which sectors can be read
|
|
* successfully.
|
|
*/
|
|
if (disable_multi && brq.data.blocks > 1)
|
|
brq.data.blocks = 1;
|
|
|
|
if (brq.data.blocks > 1) {
|
|
/* SPI multiblock writes terminate using a special
|
|
* token, not a STOP_TRANSMISSION request.
|
|
*/
|
|
if (!mmc_host_is_spi(card->host)
|
|
|| rq_data_dir(req) == READ)
|
|
brq.mrq.stop = &brq.stop;
|
|
readcmd = MMC_READ_MULTIPLE_BLOCK;
|
|
writecmd = MMC_WRITE_MULTIPLE_BLOCK;
|
|
} else {
|
|
brq.mrq.stop = NULL;
|
|
readcmd = MMC_READ_SINGLE_BLOCK;
|
|
writecmd = MMC_WRITE_BLOCK;
|
|
}
|
|
|
|
if (rq_data_dir(req) == READ) {
|
|
brq.cmd.opcode = readcmd;
|
|
brq.data.flags |= MMC_DATA_READ;
|
|
} else {
|
|
brq.cmd.opcode = writecmd;
|
|
brq.data.flags |= MMC_DATA_WRITE;
|
|
}
|
|
|
|
mmc_set_data_timeout(&brq.data, card);
|
|
|
|
brq.data.sg = mq->sg;
|
|
brq.data.sg_len = mmc_queue_map_sg(mq);
|
|
|
|
/*
|
|
* Adjust the sg list so it is the same size as the
|
|
* request.
|
|
*/
|
|
if (brq.data.blocks != blk_rq_sectors(req)) {
|
|
int i, data_size = brq.data.blocks << 9;
|
|
struct scatterlist *sg;
|
|
|
|
for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
|
|
data_size -= sg->length;
|
|
if (data_size <= 0) {
|
|
sg->length += data_size;
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
brq.data.sg_len = i;
|
|
}
|
|
|
|
mmc_queue_bounce_pre(mq);
|
|
|
|
mmc_wait_for_req(card->host, &brq.mrq);
|
|
|
|
mmc_queue_bounce_post(mq);
|
|
|
|
/*
|
|
* Check for errors here, but don't jump to cmd_err
|
|
* until later as we need to wait for the card to leave
|
|
* programming mode even when things go wrong.
|
|
*/
|
|
if (brq.cmd.error || brq.data.error || brq.stop.error) {
|
|
if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
|
|
/* Redo read one sector at a time */
|
|
printk(KERN_WARNING "%s: retrying using single "
|
|
"block read\n", req->rq_disk->disk_name);
|
|
disable_multi = 1;
|
|
continue;
|
|
}
|
|
status = get_card_status(card, req);
|
|
}
|
|
|
|
if (brq.cmd.error) {
|
|
printk(KERN_ERR "%s: error %d sending read/write "
|
|
"command, response %#x, card status %#x\n",
|
|
req->rq_disk->disk_name, brq.cmd.error,
|
|
brq.cmd.resp[0], status);
|
|
}
|
|
|
|
if (brq.data.error) {
|
|
if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
|
|
/* 'Stop' response contains card status */
|
|
status = brq.mrq.stop->resp[0];
|
|
printk(KERN_ERR "%s: error %d transferring data,"
|
|
" sector %u, nr %u, card status %#x\n",
|
|
req->rq_disk->disk_name, brq.data.error,
|
|
(unsigned)blk_rq_pos(req),
|
|
(unsigned)blk_rq_sectors(req), status);
|
|
}
|
|
|
|
if (brq.stop.error) {
|
|
printk(KERN_ERR "%s: error %d sending stop command, "
|
|
"response %#x, card status %#x\n",
|
|
req->rq_disk->disk_name, brq.stop.error,
|
|
brq.stop.resp[0], status);
|
|
}
|
|
|
|
if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
|
|
do {
|
|
int err;
|
|
|
|
cmd.opcode = MMC_SEND_STATUS;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 5);
|
|
if (err) {
|
|
printk(KERN_ERR "%s: error %d requesting status\n",
|
|
req->rq_disk->disk_name, err);
|
|
goto cmd_err;
|
|
}
|
|
/*
|
|
* Some cards mishandle the status bits,
|
|
* so make sure to check both the busy
|
|
* indication and the card state.
|
|
*/
|
|
} while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
|
|
(R1_CURRENT_STATE(cmd.resp[0]) == 7));
|
|
|
|
#if 0
|
|
if (cmd.resp[0] & ~0x00000900)
|
|
printk(KERN_ERR "%s: status = %08x\n",
|
|
req->rq_disk->disk_name, cmd.resp[0]);
|
|
if (mmc_decode_status(cmd.resp))
|
|
goto cmd_err;
|
|
#endif
|
|
}
|
|
|
|
if (brq.cmd.error || brq.stop.error || brq.data.error) {
|
|
if (rq_data_dir(req) == READ) {
|
|
/*
|
|
* After an error, we redo I/O one sector at a
|
|
* time, so we only reach here after trying to
|
|
* read a single sector.
|
|
*/
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, -EIO, brq.data.blksz);
|
|
spin_unlock_irq(&md->lock);
|
|
continue;
|
|
}
|
|
goto cmd_err;
|
|
}
|
|
|
|
/*
|
|
* A block was successfully transferred.
|
|
*/
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
|
|
spin_unlock_irq(&md->lock);
|
|
} while (ret);
|
|
|
|
mmc_release_host(card->host);
|
|
|
|
return 1;
|
|
|
|
cmd_err:
|
|
/*
|
|
* If this is an SD card and we're writing, we can first
|
|
* mark the known good sectors as ok.
|
|
*
|
|
* If the card is not SD, we can still ok written sectors
|
|
* as reported by the controller (which might be less than
|
|
* the real number of written sectors, but never more).
|
|
*/
|
|
if (mmc_card_sd(card)) {
|
|
u32 blocks;
|
|
|
|
blocks = mmc_sd_num_wr_blocks(card);
|
|
if (blocks != (u32)-1) {
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, 0, blocks << 9);
|
|
spin_unlock_irq(&md->lock);
|
|
}
|
|
} else {
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
|
|
spin_unlock_irq(&md->lock);
|
|
}
|
|
|
|
mmc_release_host(card->host);
|
|
|
|
spin_lock_irq(&md->lock);
|
|
while (ret)
|
|
ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
|
|
spin_unlock_irq(&md->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline int mmc_blk_readonly(struct mmc_card *card)
|
|
{
|
|
return mmc_card_readonly(card) ||
|
|
!(card->csd.cmdclass & CCC_BLOCK_WRITE);
|
|
}
|
|
|
|
static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int devidx, ret;
|
|
|
|
devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
|
|
if (devidx >= MMC_NUM_MINORS)
|
|
return ERR_PTR(-ENOSPC);
|
|
__set_bit(devidx, dev_use);
|
|
|
|
md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
|
|
if (!md) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set the read-only status based on the supported commands
|
|
* and the write protect switch.
|
|
*/
|
|
md->read_only = mmc_blk_readonly(card);
|
|
|
|
md->disk = alloc_disk(1 << MMC_SHIFT);
|
|
if (md->disk == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_kfree;
|
|
}
|
|
|
|
spin_lock_init(&md->lock);
|
|
md->usage = 1;
|
|
|
|
ret = mmc_init_queue(&md->queue, card, &md->lock);
|
|
if (ret)
|
|
goto err_putdisk;
|
|
|
|
md->queue.issue_fn = mmc_blk_issue_rq;
|
|
md->queue.data = md;
|
|
|
|
md->disk->major = MMC_BLOCK_MAJOR;
|
|
md->disk->first_minor = devidx << MMC_SHIFT;
|
|
md->disk->fops = &mmc_bdops;
|
|
md->disk->private_data = md;
|
|
md->disk->queue = md->queue.queue;
|
|
md->disk->driverfs_dev = &card->dev;
|
|
|
|
/*
|
|
* As discussed on lkml, GENHD_FL_REMOVABLE should:
|
|
*
|
|
* - be set for removable media with permanent block devices
|
|
* - be unset for removable block devices with permanent media
|
|
*
|
|
* Since MMC block devices clearly fall under the second
|
|
* case, we do not set GENHD_FL_REMOVABLE. Userspace
|
|
* should use the block device creation/destruction hotplug
|
|
* messages to tell when the card is present.
|
|
*/
|
|
|
|
sprintf(md->disk->disk_name, "mmcblk%d", devidx);
|
|
|
|
blk_queue_logical_block_size(md->queue.queue, 512);
|
|
|
|
if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
|
|
/*
|
|
* The EXT_CSD sector count is in number or 512 byte
|
|
* sectors.
|
|
*/
|
|
set_capacity(md->disk, card->ext_csd.sectors);
|
|
} else {
|
|
/*
|
|
* The CSD capacity field is in units of read_blkbits.
|
|
* set_capacity takes units of 512 bytes.
|
|
*/
|
|
set_capacity(md->disk,
|
|
card->csd.capacity << (card->csd.read_blkbits - 9));
|
|
}
|
|
return md;
|
|
|
|
err_putdisk:
|
|
put_disk(md->disk);
|
|
err_kfree:
|
|
kfree(md);
|
|
out:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int
|
|
mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
|
|
{
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
/* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
|
|
if (mmc_card_blockaddr(card))
|
|
return 0;
|
|
|
|
mmc_claim_host(card->host);
|
|
cmd.opcode = MMC_SET_BLOCKLEN;
|
|
cmd.arg = 512;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 5);
|
|
mmc_release_host(card->host);
|
|
|
|
if (err) {
|
|
printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
|
|
md->disk->disk_name, cmd.arg, err);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_probe(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int err;
|
|
|
|
char cap_str[10];
|
|
|
|
/*
|
|
* Check that the card supports the command class(es) we need.
|
|
*/
|
|
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
|
|
return -ENODEV;
|
|
|
|
md = mmc_blk_alloc(card);
|
|
if (IS_ERR(md))
|
|
return PTR_ERR(md);
|
|
|
|
err = mmc_blk_set_blksize(md, card);
|
|
if (err)
|
|
goto out;
|
|
|
|
string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
|
|
cap_str, sizeof(cap_str));
|
|
printk(KERN_INFO "%s: %s %s %s %s\n",
|
|
md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
|
|
cap_str, md->read_only ? "(ro)" : "");
|
|
|
|
mmc_set_drvdata(card, md);
|
|
add_disk(md->disk);
|
|
return 0;
|
|
|
|
out:
|
|
mmc_blk_put(md);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void mmc_blk_remove(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
if (md) {
|
|
/* Stop new requests from getting into the queue */
|
|
del_gendisk(md->disk);
|
|
|
|
/* Then flush out any already in there */
|
|
mmc_cleanup_queue(&md->queue);
|
|
|
|
mmc_blk_put(md);
|
|
}
|
|
mmc_set_drvdata(card, NULL);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
|
|
{
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
if (md) {
|
|
mmc_queue_suspend(&md->queue);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_resume(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
if (md) {
|
|
mmc_blk_set_blksize(md, card);
|
|
mmc_queue_resume(&md->queue);
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
#define mmc_blk_suspend NULL
|
|
#define mmc_blk_resume NULL
|
|
#endif
|
|
|
|
static struct mmc_driver mmc_driver = {
|
|
.drv = {
|
|
.name = "mmcblk",
|
|
},
|
|
.probe = mmc_blk_probe,
|
|
.remove = mmc_blk_remove,
|
|
.suspend = mmc_blk_suspend,
|
|
.resume = mmc_blk_resume,
|
|
};
|
|
|
|
static int __init mmc_blk_init(void)
|
|
{
|
|
int res;
|
|
|
|
res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
if (res)
|
|
goto out;
|
|
|
|
res = mmc_register_driver(&mmc_driver);
|
|
if (res)
|
|
goto out2;
|
|
|
|
return 0;
|
|
out2:
|
|
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static void __exit mmc_blk_exit(void)
|
|
{
|
|
mmc_unregister_driver(&mmc_driver);
|
|
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
}
|
|
|
|
module_init(mmc_blk_init);
|
|
module_exit(mmc_blk_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
|
|
|