| /* |
| * 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/slab.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"); |
| #ifdef MODULE_PARAM_PREFIX |
| #undef MODULE_PARAM_PREFIX |
| #endif |
| #define MODULE_PARAM_PREFIX "mmcblk." |
| |
| static DEFINE_MUTEX(block_mutex); |
| |
| /* |
| * The defaults come from config options but can be overriden by module |
| * or bootarg options. |
| */ |
| static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; |
| |
| /* |
| * We've only got one major, so number of mmcblk devices is |
| * limited to 256 / number of minors per device. |
| */ |
| static int max_devices; |
| |
| /* 256 minors, so at most 256 separate devices */ |
| static DECLARE_BITMAP(dev_use, 256); |
| |
| /* |
| * 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); |
| |
| module_param(perdev_minors, int, 0444); |
| MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); |
| |
| 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 devmaj = MAJOR(disk_devt(md->disk)); |
| int devidx = MINOR(disk_devt(md->disk)) / perdev_minors; |
| |
| if (!devmaj) |
| devidx = md->disk->first_minor / perdev_minors; |
| |
| blk_cleanup_queue(md->queue.queue); |
| |
| __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; |
| |
| mutex_lock(&block_mutex); |
| 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; |
| } |
| } |
| mutex_unlock(&block_mutex); |
| |
| return ret; |
| } |
| |
| static int mmc_blk_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct mmc_blk_data *md = disk->private_data; |
| |
| mutex_lock(&block_mutex); |
| mmc_blk_put(md); |
| mutex_unlock(&block_mutex); |
| 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 command", |
| req->rq_disk->disk_name, err); |
| return cmd.resp[0]; |
| } |
| |
| static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req) |
| { |
| struct mmc_blk_data *md = mq->data; |
| struct mmc_card *card = md->queue.card; |
| unsigned int from, nr, arg; |
| int err = 0; |
| |
| mmc_claim_host(card->host); |
| |
| if (!mmc_can_erase(card)) { |
| err = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| from = blk_rq_pos(req); |
| nr = blk_rq_sectors(req); |
| |
| if (mmc_can_trim(card)) |
| arg = MMC_TRIM_ARG; |
| else |
| arg = MMC_ERASE_ARG; |
| |
| err = mmc_erase(card, from, nr, arg); |
| out: |
| spin_lock_irq(&md->lock); |
| __blk_end_request(req, err, blk_rq_bytes(req)); |
| spin_unlock_irq(&md->lock); |
| |
| mmc_release_host(card->host); |
| |
| return err ? 0 : 1; |
| } |
| |
| static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, |
| struct request *req) |
| { |
| struct mmc_blk_data *md = mq->data; |
| struct mmc_card *card = md->queue.card; |
| unsigned int from, nr, arg; |
| int err = 0; |
| |
| mmc_claim_host(card->host); |
| |
| if (!mmc_can_secure_erase_trim(card)) { |
| err = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| from = blk_rq_pos(req); |
| nr = blk_rq_sectors(req); |
| |
| if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) |
| arg = MMC_SECURE_TRIM1_ARG; |
| else |
| arg = MMC_SECURE_ERASE_ARG; |
| |
| err = mmc_erase(card, from, nr, arg); |
| if (!err && arg == MMC_SECURE_TRIM1_ARG) |
| err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); |
| out: |
| spin_lock_irq(&md->lock); |
| __blk_end_request(req, err, blk_rq_bytes(req)); |
| spin_unlock_irq(&md->lock); |
| |
| mmc_release_host(card->host); |
| |
| return err ? 0 : 1; |
| } |
| |
| static int mmc_blk_issue_rw_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 int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) |
| { |
| if (req->cmd_flags & REQ_DISCARD) { |
| if (req->cmd_flags & REQ_SECURE) |
| return mmc_blk_issue_secdiscard_rq(mq, req); |
| else |
| return mmc_blk_issue_discard_rq(mq, req); |
| } else { |
| return mmc_blk_issue_rw_rq(mq, req); |
| } |
| } |
| |
| 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, max_devices); |
| if (devidx >= max_devices) |
| 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(perdev_minors); |
| 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 * perdev_minors; |
| 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. |
| */ |
| |
| snprintf(md->disk->disk_name, sizeof(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) |
| { |
| int err; |
| |
| mmc_claim_host(card->host); |
| err = mmc_set_blocklen(card, 512); |
| mmc_release_host(card->host); |
| |
| if (err) { |
| printk(KERN_ERR "%s: unable to set block size to 512: %d\n", |
| md->disk->disk_name, 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_cleanup_queue(&md->queue); |
| 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; |
| |
| if (perdev_minors != CONFIG_MMC_BLOCK_MINORS) |
| pr_info("mmcblk: using %d minors per device\n", perdev_minors); |
| |
| max_devices = 256 / perdev_minors; |
| |
| 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"); |
| |