W1: feature, enable hardware strong pullup

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / ide / ide-floppy.c

/*
 * IDE ATAPI floppy driver.
 *
 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
 */

#define DRV_NAME "ide-floppy"
#define PFX DRV_NAME ": "

#define IDEFLOPPY_VERSION "1.00"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>

#include <scsi/scsi_ioctl.h>

#include <asm/byteorder.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/unaligned.h>

#include "ide-floppy.h"

/* module parameters */
static unsigned long debug_mask;
module_param(debug_mask, ulong, 0644);

/* define to see debug info */
#define IDEFLOPPY_DEBUG_LOG     0

#if IDEFLOPPY_DEBUG_LOG
#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, args)
#else
#define ide_debug_log(lvl, fmt, args...) do {} while (0)
#endif

/*
 * After each failed packet command we issue a request sense command and retry
 * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 */
#define IDEFLOPPY_MAX_PC_RETRIES        3

/* format capacities descriptor codes */
#define CAPACITY_INVALID        0x00
#define CAPACITY_UNFORMATTED    0x01
#define CAPACITY_CURRENT        0x02
#define CAPACITY_NO_CARTRIDGE   0x03

/*
 * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
 * was apparently being deasserted before the unit was ready to receive data.
 */
#define IDEFLOPPY_PC_DELAY      (HZ/20) /* default delay for ZIP 100 (50ms) */

/* Error code returned in rq->errors to the higher part of the driver. */
#define IDEFLOPPY_ERROR_GENERAL         101

static DEFINE_MUTEX(idefloppy_ref_mutex);

static void idefloppy_cleanup_obj(struct kref *);

static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
{
        struct ide_floppy_obj *floppy = NULL;

        mutex_lock(&idefloppy_ref_mutex);
        floppy = ide_drv_g(disk, ide_floppy_obj);
        if (floppy) {
                if (ide_device_get(floppy->drive))
                        floppy = NULL;
                else
                        kref_get(&floppy->kref);
        }
        mutex_unlock(&idefloppy_ref_mutex);
        return floppy;
}

static void ide_floppy_put(struct ide_floppy_obj *floppy)
{
        ide_drive_t *drive = floppy->drive;

        mutex_lock(&idefloppy_ref_mutex);
        kref_put(&floppy->kref, idefloppy_cleanup_obj);
        ide_device_put(drive);
        mutex_unlock(&idefloppy_ref_mutex);
}

/*
 * Used to finish servicing a request. For read/write requests, we will call
 * ide_end_request to pass to the next buffer.
 */
static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct request *rq = HWGROUP(drive)->rq;
        int error;

        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);

        switch (uptodate) {
        case 0:
                error = IDEFLOPPY_ERROR_GENERAL;
                break;

        case 1:
                error = 0;
                break;

        default:
                error = uptodate;
        }

        if (error)
                floppy->failed_pc = NULL;
        /* Why does this happen? */
        if (!rq)
                return 0;
        if (!blk_special_request(rq)) {
                /* our real local end request function */
                ide_end_request(drive, uptodate, nsecs);
                return 0;
        }
        rq->errors = error;
        /* fixme: need to move this local also */
        ide_end_drive_cmd(drive, 0, 0);
        return 0;
}

static void idefloppy_update_buffers(ide_drive_t *drive,
                                struct ide_atapi_pc *pc)
{
        struct request *rq = pc->rq;
        struct bio *bio = rq->bio;

        while ((bio = rq->bio) != NULL)
                idefloppy_end_request(drive, 1, 0);
}

static void ide_floppy_callback(ide_drive_t *drive, int dsc)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc *pc = drive->pc;
        int uptodate = pc->error ? 0 : 1;

        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);

        if (floppy->failed_pc == pc)
                floppy->failed_pc = NULL;

        if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
            (pc->rq && blk_pc_request(pc->rq)))
                uptodate = 1; /* FIXME */
        else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
                u8 *buf = pc->buf;

                if (!pc->error) {
                        floppy->sense_key = buf[2] & 0x0F;
                        floppy->asc = buf[12];
                        floppy->ascq = buf[13];
                        floppy->progress_indication = buf[15] & 0x80 ?
                                (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;

                        if (floppy->failed_pc)
                                ide_debug_log(IDE_DBG_PC, "pc = %x, ",
                                              floppy->failed_pc->c[0]);

                        ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
                                      "ascq = %x\n", floppy->sense_key,
                                      floppy->asc, floppy->ascq);
                } else
                        printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
                               "Aborting request!\n");
        }

        idefloppy_end_request(drive, uptodate, 0);
}

static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
                                    struct ide_atapi_pc *pc)
{
        /* supress error messages resulting from Medium not present */
        if (floppy->sense_key == 0x02 &&
            floppy->asc       == 0x3a &&
            floppy->ascq      == 0x00)
                return;

        printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
                        "asc = %2x, ascq = %2x\n",
                        floppy->drive->name, pc->c[0], floppy->sense_key,
                        floppy->asc, floppy->ascq);

}

static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
                struct ide_atapi_pc *pc)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        if (floppy->failed_pc == NULL &&
            pc->c[0] != GPCMD_REQUEST_SENSE)
                floppy->failed_pc = pc;

        /* Set the current packet command */
        drive->pc = pc;

        if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
                if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
                        ide_floppy_report_error(floppy, pc);
                /* Giving up */
                pc->error = IDEFLOPPY_ERROR_GENERAL;

                floppy->failed_pc = NULL;
                drive->pc_callback(drive, 0);
                return ide_stopped;
        }

        ide_debug_log(IDE_DBG_FUNC, "%s: Retry #%d\n", __func__, pc->retries);

        pc->retries++;

        return ide_issue_pc(drive, WAIT_FLOPPY_CMD, NULL);
}

void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
{
        ide_init_pc(pc);
        pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
        pc->c[7] = 255;
        pc->c[8] = 255;
        pc->req_xfer = 255;
}

/* A mode sense command is used to "sense" floppy parameters. */
void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
{
        u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */

        ide_init_pc(pc);
        pc->c[0] = GPCMD_MODE_SENSE_10;
        pc->c[1] = 0;
        pc->c[2] = page_code;

        switch (page_code) {
        case IDEFLOPPY_CAPABILITIES_PAGE:
                length += 12;
                break;
        case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
                length += 32;
                break;
        default:
                printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
        }
        put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
        pc->req_xfer = length;
}

static void idefloppy_create_rw_cmd(ide_drive_t *drive,
                                    struct ide_atapi_pc *pc, struct request *rq,
                                    unsigned long sector)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        int block = sector / floppy->bs_factor;
        int blocks = rq->nr_sectors / floppy->bs_factor;
        int cmd = rq_data_dir(rq);

        ide_debug_log(IDE_DBG_FUNC, "%s: block: %d, blocks: %d\n", __func__,
                      block, blocks);

        ide_init_pc(pc);
        pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
        put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
        put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);

        memcpy(rq->cmd, pc->c, 12);

        pc->rq = rq;
        pc->b_count = 0;
        if (rq->cmd_flags & REQ_RW)
                pc->flags |= PC_FLAG_WRITING;
        pc->buf = NULL;
        pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
        pc->flags |= PC_FLAG_DMA_OK;
}

static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
                struct ide_atapi_pc *pc, struct request *rq)
{
        ide_init_pc(pc);
        memcpy(pc->c, rq->cmd, sizeof(pc->c));
        pc->rq = rq;
        pc->b_count = 0;
        if (rq->data_len && rq_data_dir(rq) == WRITE)
                pc->flags |= PC_FLAG_WRITING;
        pc->buf = rq->data;
        if (rq->bio)
                pc->flags |= PC_FLAG_DMA_OK;
        /*
         * possibly problematic, doesn't look like ide-floppy correctly
         * handled scattered requests if dma fails...
         */
        pc->req_xfer = pc->buf_size = rq->data_len;
}

static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
                struct request *rq, sector_t block_s)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        ide_hwif_t *hwif = drive->hwif;
        struct ide_atapi_pc *pc;
        unsigned long block = (unsigned long)block_s;

        ide_debug_log(IDE_DBG_FUNC, "%s: dev: %s, cmd: 0x%x, cmd_type: %x, "
                      "errors: %d\n",
                      __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
                      rq->cmd[0], rq->cmd_type, rq->errors);

        ide_debug_log(IDE_DBG_FUNC, "%s: sector: %ld, nr_sectors: %ld, "
                      "current_nr_sectors: %d\n",
                      __func__, (long)rq->sector, rq->nr_sectors,
                      rq->current_nr_sectors);

        if (rq->errors >= ERROR_MAX) {
                if (floppy->failed_pc)
                        ide_floppy_report_error(floppy, floppy->failed_pc);
                else
                        printk(KERN_ERR PFX "%s: I/O error\n", drive->name);

                idefloppy_end_request(drive, 0, 0);
                return ide_stopped;
        }
        if (blk_fs_request(rq)) {
                if (((long)rq->sector % floppy->bs_factor) ||
                    (rq->nr_sectors % floppy->bs_factor)) {
                        printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
                                drive->name);
                        idefloppy_end_request(drive, 0, 0);
                        return ide_stopped;
                }
                pc = &floppy->queued_pc;
                idefloppy_create_rw_cmd(drive, pc, rq, block);
        } else if (blk_special_request(rq)) {
                pc = (struct ide_atapi_pc *) rq->buffer;
        } else if (blk_pc_request(rq)) {
                pc = &floppy->queued_pc;
                idefloppy_blockpc_cmd(floppy, pc, rq);
        } else {
                blk_dump_rq_flags(rq, PFX "unsupported command in queue");
                idefloppy_end_request(drive, 0, 0);
                return ide_stopped;
        }

        ide_init_sg_cmd(drive, rq);
        ide_map_sg(drive, rq);

        pc->sg = hwif->sg_table;
        pc->sg_cnt = hwif->sg_nents;

        pc->rq = rq;

        return idefloppy_issue_pc(drive, pc);
}

/*
 * Look at the flexible disk page parameters. We ignore the CHS capacity
 * parameters and use the LBA parameters instead.
 */
static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct gendisk *disk = floppy->disk;
        struct ide_atapi_pc pc;
        u8 *page;
        int capacity, lba_capacity;
        u16 transfer_rate, sector_size, cyls, rpm;
        u8 heads, sectors;

        ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);

        if (ide_queue_pc_tail(drive, disk, &pc)) {
                printk(KERN_ERR PFX "Can't get flexible disk page params\n");
                return 1;
        }

        if (pc.buf[3] & 0x80)
                drive->atapi_flags |= IDE_AFLAG_WP;
        else
                drive->atapi_flags &= ~IDE_AFLAG_WP;

        set_disk_ro(disk, !!(drive->atapi_flags & IDE_AFLAG_WP));

        page = &pc.buf[8];

        transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
        sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
        cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
        rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
        heads         = pc.buf[8 + 4];
        sectors       = pc.buf[8 + 5];

        capacity = cyls * heads * sectors * sector_size;

        if (memcmp(page, &floppy->flexible_disk_page, 32))
                printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
                                "%d sector size, %d rpm\n",
                                drive->name, capacity / 1024, cyls, heads,
                                sectors, transfer_rate / 8, sector_size, rpm);

        memcpy(&floppy->flexible_disk_page, page, 32);
        drive->bios_cyl = cyls;
        drive->bios_head = heads;
        drive->bios_sect = sectors;
        lba_capacity = floppy->blocks * floppy->block_size;

        if (capacity < lba_capacity) {
                printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
                        "bytes, but the drive only handles %d\n",
                        drive->name, lba_capacity, capacity);
                floppy->blocks = floppy->block_size ?
                        capacity / floppy->block_size : 0;
        }
        return 0;
}

/*
 * Determine if a media is present in the floppy drive, and if so, its LBA
 * capacity.
 */
static int ide_floppy_get_capacity(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct gendisk *disk = floppy->disk;
        struct ide_atapi_pc pc;
        u8 *cap_desc;
        u8 header_len, desc_cnt;
        int i, rc = 1, blocks, length;

        drive->bios_cyl = 0;
        drive->bios_head = drive->bios_sect = 0;
        floppy->blocks = 0;
        floppy->bs_factor = 1;
        set_capacity(floppy->disk, 0);

        ide_floppy_create_read_capacity_cmd(&pc);
        if (ide_queue_pc_tail(drive, disk, &pc)) {
                printk(KERN_ERR PFX "Can't get floppy parameters\n");
                return 1;
        }
        header_len = pc.buf[3];
        cap_desc = &pc.buf[4];
        desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

        for (i = 0; i < desc_cnt; i++) {
                unsigned int desc_start = 4 + i*8;

                blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
                length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);

                ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
                              "%d sector size\n",
                              i, blocks * length / 1024, blocks, length);

                if (i)
                        continue;
                /*
                 * the code below is valid only for the 1st descriptor, ie i=0
                 */

                switch (pc.buf[desc_start + 4] & 0x03) {
                /* Clik! drive returns this instead of CAPACITY_CURRENT */
                case CAPACITY_UNFORMATTED:
                        if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
                                /*
                                 * If it is not a clik drive, break out
                                 * (maintains previous driver behaviour)
                                 */
                                break;
                case CAPACITY_CURRENT:
                        /* Normal Zip/LS-120 disks */
                        if (memcmp(cap_desc, &floppy->cap_desc, 8))
                                printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
                                       "sector size\n",
                                       drive->name, blocks * length / 1024,
                                       blocks, length);
                        memcpy(&floppy->cap_desc, cap_desc, 8);

                        if (!length || length % 512) {
                                printk(KERN_NOTICE PFX "%s: %d bytes block size"
                                       " not supported\n", drive->name, length);
                        } else {
                                floppy->blocks = blocks;
                                floppy->block_size = length;
                                floppy->bs_factor = length / 512;
                                if (floppy->bs_factor != 1)
                                        printk(KERN_NOTICE PFX "%s: Warning: "
                                               "non 512 bytes block size not "
                                               "fully supported\n",
                                               drive->name);
                                rc = 0;
                        }
                        break;
                case CAPACITY_NO_CARTRIDGE:
                        /*
                         * This is a KERN_ERR so it appears on screen
                         * for the user to see
                         */
                        printk(KERN_ERR PFX "%s: No disk in drive\n",
                               drive->name);
                        break;
                case CAPACITY_INVALID:
                        printk(KERN_ERR PFX "%s: Invalid capacity for disk "
                                "in drive\n", drive->name);
                        break;
                }
                ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d\n",
                              pc.buf[desc_start + 4] & 0x03);
        }

        /* Clik! disk does not support get_flexible_disk_page */
        if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
                (void) ide_floppy_get_flexible_disk_page(drive);

        set_capacity(disk, floppy->blocks * floppy->bs_factor);

        return rc;
}

sector_t ide_floppy_capacity(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        unsigned long capacity = floppy->blocks * floppy->bs_factor;

        return capacity;
}

static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
{
        u16 *id = drive->id;

        drive->pc_callback       = ide_floppy_callback;
        drive->pc_update_buffers = idefloppy_update_buffers;
        drive->pc_io_buffers     = ide_io_buffers;

        /*
         * We used to check revisions here. At this point however I'm giving up.
         * Just assume they are all broken, its easier.
         *
         * The actual reason for the workarounds was likely a driver bug after
         * all rather than a firmware bug, and the workaround below used to hide
         * it. It should be fixed as of version 1.9, but to be on the safe side
         * we'll leave the limitation below for the 2.2.x tree.
         */
        if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
                drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
                /* This value will be visible in the /proc/ide/hdx/settings */
                drive->pc_delay = IDEFLOPPY_PC_DELAY;
                blk_queue_max_sectors(drive->queue, 64);
        }

        /*
         * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
         * nasty clicking noises without it, so please don't remove this.
         */
        if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
                blk_queue_max_sectors(drive->queue, 64);
                drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
                /* IOMEGA Clik! drives do not support lock/unlock commands */
                drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
        }

        (void) ide_floppy_get_capacity(drive);

        ide_proc_register_driver(drive, floppy->driver);
}

static void ide_floppy_remove(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct gendisk *g = floppy->disk;

        ide_proc_unregister_driver(drive, floppy->driver);

        del_gendisk(g);

        ide_floppy_put(floppy);
}

static void idefloppy_cleanup_obj(struct kref *kref)
{
        struct ide_floppy_obj *floppy = to_ide_drv(kref, ide_floppy_obj);
        ide_drive_t *drive = floppy->drive;
        struct gendisk *g = floppy->disk;

        drive->driver_data = NULL;
        g->private_data = NULL;
        put_disk(g);
        kfree(floppy);
}

static int ide_floppy_probe(ide_drive_t *);

static ide_driver_t idefloppy_driver = {
        .gen_driver = {
                .owner          = THIS_MODULE,
                .name           = "ide-floppy",
                .bus            = &ide_bus_type,
        },
        .probe                  = ide_floppy_probe,
        .remove                 = ide_floppy_remove,
        .version                = IDEFLOPPY_VERSION,
        .do_request             = idefloppy_do_request,
        .end_request            = idefloppy_end_request,
        .error                  = __ide_error,
#ifdef CONFIG_IDE_PROC_FS
        .proc                   = ide_floppy_proc,
        .settings               = ide_floppy_settings,
#endif
};

static int idefloppy_open(struct inode *inode, struct file *filp)
{
        struct gendisk *disk = inode->i_bdev->bd_disk;
        struct ide_floppy_obj *floppy;
        ide_drive_t *drive;
        int ret = 0;

        floppy = ide_floppy_get(disk);
        if (!floppy)
                return -ENXIO;

        drive = floppy->drive;

        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);

        floppy->openers++;

        if (floppy->openers == 1) {
                drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
                /* Just in case */

                if (ide_do_test_unit_ready(drive, disk))
                        ide_do_start_stop(drive, disk, 1);

                if (ide_floppy_get_capacity(drive)
                   && (filp->f_flags & O_NDELAY) == 0
                    /*
                     * Allow O_NDELAY to open a drive without a disk, or with an
                     * unreadable disk, so that we can get the format capacity
                     * of the drive or begin the format - Sam
                     */
                    ) {
                        ret = -EIO;
                        goto out_put_floppy;
                }

                if ((drive->atapi_flags & IDE_AFLAG_WP) && (filp->f_mode & 2)) {
                        ret = -EROFS;
                        goto out_put_floppy;
                }

                drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
                ide_set_media_lock(drive, disk, 1);
                check_disk_change(inode->i_bdev);
        } else if (drive->atapi_flags & IDE_AFLAG_FORMAT_IN_PROGRESS) {
                ret = -EBUSY;
                goto out_put_floppy;
        }
        return 0;

out_put_floppy:
        floppy->openers--;
        ide_floppy_put(floppy);
        return ret;
}

static int idefloppy_release(struct inode *inode, struct file *filp)
{
        struct gendisk *disk = inode->i_bdev->bd_disk;
        struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
        ide_drive_t *drive = floppy->drive;

        ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);

        if (floppy->openers == 1) {
                ide_set_media_lock(drive, disk, 0);
                drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
        }

        floppy->openers--;

        ide_floppy_put(floppy);

        return 0;
}

static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
        struct ide_floppy_obj *floppy = ide_drv_g(bdev->bd_disk,
                                                     ide_floppy_obj);
        ide_drive_t *drive = floppy->drive;

        geo->heads = drive->bios_head;
        geo->sectors = drive->bios_sect;
        geo->cylinders = (u16)drive->bios_cyl; /* truncate */
        return 0;
}

static int idefloppy_media_changed(struct gendisk *disk)
{
        struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
        ide_drive_t *drive = floppy->drive;
        int ret;

        /* do not scan partitions twice if this is a removable device */
        if (drive->dev_flags & IDE_DFLAG_ATTACH) {
                drive->dev_flags &= ~IDE_DFLAG_ATTACH;
                return 0;
        }
        ret = !!(drive->atapi_flags & IDE_AFLAG_MEDIA_CHANGED);
        drive->atapi_flags &= ~IDE_AFLAG_MEDIA_CHANGED;
        return ret;
}

static int idefloppy_revalidate_disk(struct gendisk *disk)
{
        struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
        set_capacity(disk, ide_floppy_capacity(floppy->drive));
        return 0;
}

static struct block_device_operations idefloppy_ops = {
        .owner                  = THIS_MODULE,
        .open                   = idefloppy_open,
        .release                = idefloppy_release,
        .ioctl                  = ide_floppy_ioctl,
        .getgeo                 = idefloppy_getgeo,
        .media_changed          = idefloppy_media_changed,
        .revalidate_disk        = idefloppy_revalidate_disk
};

static int ide_floppy_probe(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy;
        struct gendisk *g;

        if (!strstr("ide-floppy", drive->driver_req))
                goto failed;

        if (drive->media != ide_floppy)
                goto failed;

        if (!ide_check_atapi_device(drive, DRV_NAME)) {
                printk(KERN_ERR PFX "%s: not supported by this version of "
                       DRV_NAME "\n", drive->name);
                goto failed;
        }
        floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
        if (!floppy) {
                printk(KERN_ERR PFX "%s: Can't allocate a floppy structure\n",
                       drive->name);
                goto failed;
        }

        g = alloc_disk(1 << PARTN_BITS);
        if (!g)
                goto out_free_floppy;

        ide_init_disk(g, drive);

        kref_init(&floppy->kref);

        floppy->drive = drive;
        floppy->driver = &idefloppy_driver;
        floppy->disk = g;

        g->private_data = &floppy->driver;

        drive->driver_data = floppy;

        drive->debug_mask = debug_mask;

        idefloppy_setup(drive, floppy);
        drive->dev_flags |= IDE_DFLAG_ATTACH;

        g->minors = 1 << PARTN_BITS;
        g->driverfs_dev = &drive->gendev;
        if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
                g->flags = GENHD_FL_REMOVABLE;
        g->fops = &idefloppy_ops;
        add_disk(g);
        return 0;

out_free_floppy:
        kfree(floppy);
failed:
        return -ENODEV;
}

static void __exit idefloppy_exit(void)
{
        driver_unregister(&idefloppy_driver.gen_driver);
}

static int __init idefloppy_init(void)
{
        printk(KERN_INFO DRV_NAME " driver " IDEFLOPPY_VERSION "\n");
        return driver_register(&idefloppy_driver.gen_driver);
}

MODULE_ALIAS("ide:*m-floppy*");
MODULE_ALIAS("ide-floppy");
module_init(idefloppy_init);
module_exit(idefloppy_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ATAPI FLOPPY Driver");