/*
 * The Mitsumi CDROM interface
 * Copyright (C) 1995 1996 Heiko Schlittermann <heiko@lotte.sax.de>
 * VERSION: 2.14(hs)
 *
 * ... anyway, I'm back again, thanks to Marcin, he adopted
 * large portions of my code (at least the parts containing
 * my main thoughts ...)
 *
 ****************** H E L P *********************************
 * If you ever plan to update your CD ROM drive and perhaps
 * want to sell or simply give away your Mitsumi FX-001[DS]
 * -- Please --
 * mail me (heiko@lotte.sax.de).  When my last drive goes
 * ballistic no more driver support will be available from me!
 *************************************************************
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Thanks to
 *  The Linux Community at all and ...
 *  Martin Harriss (he wrote the first Mitsumi Driver)
 *  Eberhard Moenkeberg (he gave me much support and the initial kick)
 *  Bernd Huebner, Ruediger Helsch (Unifix-Software GmbH, they
 *      improved the original driver)
 *  Jon Tombs, Bjorn Ekwall (module support)
 *  Daniel v. Mosnenck (he sent me the Technical and Programming Reference)
 *  Gerd Knorr (he lent me his PhotoCD)
 *  Nils Faerber and Roger E. Wolff (extensively tested the LU portion)
 *  Andreas Kies (testing the mysterious hang-ups)
 *  Heiko Eissfeldt (VERIFY_READ/WRITE)
 *  Marcin Dalecki (improved performance, shortened code)
 *  ... somebody forgotten?
 *
 *  9 November 1999 -- Make kernel-parameter implementation work with 2.3.x 
 *                     Removed init_module & cleanup_module in favor of 
 *                     module_init & module_exit.
 *                     Torben Mathiasen <tmm@image.dk>
 */


#if RCS
static const char *mcdx_c_version
    = "$Id: mcdx.c,v 1.21 1997/01/26 07:12:59 davem Exp $";
#endif

#include <linux/version.h>
#include <linux/module.h>

#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/cdrom.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/current.h>
#include <asm/uaccess.h>

#include <linux/major.h>
#define MAJOR_NR MITSUMI_X_CDROM_MAJOR
#include <linux/blkdev.h>
#include <linux/devfs_fs_kernel.h>

/* for compatible parameter passing with "insmod" */
#define mcdx_drive_map mcdx
#include "mcdx.h"

#ifndef HZ
#error HZ not defined
#endif

#define xwarn(fmt, args...) printk(KERN_WARNING MCDX " " fmt, ## args)

#if !MCDX_QUIET
#define xinfo(fmt, args...) printk(KERN_INFO MCDX " " fmt, ## args)
#else
#define xinfo(fmt, args...) { ; }
#endif

#if MCDX_DEBUG
#define xtrace(lvl, fmt, args...) \
                { if (lvl > 0) \
                        { printk(KERN_DEBUG MCDX ":: " fmt, ## args); } }
#define xdebug(fmt, args...) printk(KERN_DEBUG MCDX ":: " fmt, ## args)
#else
#define xtrace(lvl, fmt, args...) { ; }
#define xdebug(fmt, args...) { ; }
#endif

/* CONSTANTS *******************************************************/

/* Following are the number of sectors we _request_ from the drive
   every time an access outside the already requested range is done.
   The _direct_ size is the number of sectors we're allowed to skip
   directly (performing a read instead of requesting the new sector
   needed */
const int REQUEST_SIZE = 800;   /* should be less then 255 * 4 */
const int DIRECT_SIZE = 400;    /* should be less then REQUEST_SIZE */

enum drivemodes { TOC, DATA, RAW, COOKED };
enum datamodes { MODE0, MODE1, MODE2 };
enum resetmodes { SOFT, HARD };

const int SINGLE = 0x01;        /* single speed drive (FX001S, LU) */
const int DOUBLE = 0x02;        /* double speed drive (FX001D, ..? */
const int DOOR = 0x04;          /* door locking capability */
const int MULTI = 0x08;         /* multi session capability */

const unsigned char READ1X = 0xc0;
const unsigned char READ2X = 0xc1;


/* DECLARATIONS ****************************************************/
struct s_subqcode {
        unsigned char control;
        unsigned char tno;
        unsigned char index;
        struct cdrom_msf0 tt;
        struct cdrom_msf0 dt;
};

struct s_diskinfo {
        unsigned int n_first;
        unsigned int n_last;
        struct cdrom_msf0 msf_leadout;
        struct cdrom_msf0 msf_first;
};

struct s_multi {
        unsigned char multi;
        struct cdrom_msf0 msf_last;
};

struct s_version {
        unsigned char code;
        unsigned char ver;
};

/* Per drive/controller stuff **************************************/

struct s_drive_stuff {
        /* waitqueues */
        wait_queue_head_t busyq;
        wait_queue_head_t lockq;
        wait_queue_head_t sleepq;

        /* flags */
        volatile int introk;    /* status of last irq operation */
        volatile int busy;      /* drive performs an operation */
        volatile int lock;      /* exclusive usage */

        /* cd infos */
        struct s_diskinfo di;
        struct s_multi multi;
        struct s_subqcode *toc; /* first entry of the toc array */
        struct s_subqcode start;
        struct s_subqcode stop;
        int xa;                 /* 1 if xa disk */
        int audio;              /* 1 if audio disk */
        int audiostatus;

        /* `buffer' control */
        volatile int valid;     /* pending, ..., values are valid */
        volatile int pending;   /* next sector to be read */
        volatile int low_border;        /* first sector not to be skipped direct */
        volatile int high_border;       /* first sector `out of area' */
#ifdef AK2
        volatile int int_err;
#endif                          /* AK2 */

        /* adds and odds */
        unsigned wreg_data;     /* w data */
        unsigned wreg_reset;    /* w hardware reset */
        unsigned wreg_hcon;     /* w hardware conf */
        unsigned wreg_chn;      /* w channel */
        unsigned rreg_data;     /* r data */
        unsigned rreg_status;   /* r status */

        int irq;                /* irq used by this drive */
        int present;            /* drive present and its capabilities */
        unsigned char readcmd;  /* read cmd depends on single/double speed */
        unsigned char playcmd;  /* play should always be single speed */
        unsigned int xxx;       /* set if changed, reset while open */
        unsigned int yyy;       /* set if changed, reset by media_changed */
        int users;              /* keeps track of open/close */
        int lastsector;         /* last block accessible */
        int status;             /* last operation's error / status */
        int readerrs;           /* # of blocks read w/o error */
        struct cdrom_device_info info;
        struct gendisk *disk;
};


/* Prototypes ******************************************************/

/*      The following prototypes are already declared elsewhere.  They are
        repeated here to show what's going on.  And to sense, if they're
        changed elsewhere. */

/* declared in blk.h */
int mcdx_init(void);
void do_mcdx_request(request_queue_t * q);

static int mcdx_block_open(struct inode *inode, struct file *file)
{
        struct s_drive_stuff *p = inode->i_bdev->bd_disk->private_data;
        return cdrom_open(&p->info, inode, file);
}

static int mcdx_block_release(struct inode *inode, struct file *file)
{
        struct s_drive_stuff *p = inode->i_bdev->bd_disk->private_data;
        return cdrom_release(&p->info, file);
}

static int mcdx_block_ioctl(struct inode *inode, struct file *file,
                                unsigned cmd, unsigned long arg)
{
        struct s_drive_stuff *p = inode->i_bdev->bd_disk->private_data;
        return cdrom_ioctl(file, &p->info, inode, cmd, arg);
}

static int mcdx_block_media_changed(struct gendisk *disk)
{
        struct s_drive_stuff *p = disk->private_data;
        return cdrom_media_changed(&p->info);
}

static struct block_device_operations mcdx_bdops =
{
        .owner          = THIS_MODULE,
        .open           = mcdx_block_open,
        .release        = mcdx_block_release,
        .ioctl          = mcdx_block_ioctl,
        .media_changed  = mcdx_block_media_changed,
};


/*      Indirect exported functions. These functions are exported by their
        addresses, such as mcdx_open and mcdx_close in the
        structure mcdx_dops. */

/* exported by file_ops */
static int mcdx_open(struct cdrom_device_info *cdi, int purpose);
static void mcdx_close(struct cdrom_device_info *cdi);
static int mcdx_media_changed(struct cdrom_device_info *cdi, int disc_nr);
static int mcdx_tray_move(struct cdrom_device_info *cdi, int position);
static int mcdx_lockdoor(struct cdrom_device_info *cdi, int lock);
static int mcdx_audio_ioctl(struct cdrom_device_info *cdi,
                            unsigned int cmd, void *arg);

/* misc internal support functions */
static void log2msf(unsigned int, struct cdrom_msf0 *);
static unsigned int msf2log(const struct cdrom_msf0 *);
static unsigned int uint2bcd(unsigned int);
static unsigned int bcd2uint(unsigned char);
static unsigned port(int *);
static int irq(int *);
static void mcdx_delay(struct s_drive_stuff *, long jifs);
static int mcdx_transfer(struct s_drive_stuff *, char *buf, int sector,
                         int nr_sectors);
static int mcdx_xfer(struct s_drive_stuff *, char *buf, int sector,
                     int nr_sectors);

static int mcdx_config(struct s_drive_stuff *, int);
static int mcdx_requestversion(struct s_drive_stuff *, struct s_version *,
                               int);
static int mcdx_stop(struct s_drive_stuff *, int);
static int mcdx_hold(struct s_drive_stuff *, int);
static int mcdx_reset(struct s_drive_stuff *, enum resetmodes, int);
static int mcdx_setdrivemode(struct s_drive_stuff *, enum drivemodes, int);
static int mcdx_setdatamode(struct s_drive_stuff *, enum datamodes, int);
static int mcdx_requestsubqcode(struct s_drive_stuff *,
                                struct s_subqcode *, int);
static int mcdx_requestmultidiskinfo(struct s_drive_stuff *,
                                     struct s_multi *, int);
static int mcdx_requesttocdata(struct s_drive_stuff *, struct s_diskinfo *,
                               int);
static int mcdx_getstatus(struct s_drive_stuff *, int);
static int mcdx_getval(struct s_drive_stuff *, int to, int delay, char *);
static int mcdx_talk(struct s_drive_stuff *,
                     const unsigned char *cmd, size_t,
                     void *buffer, size_t size, unsigned int timeout, int);
static int mcdx_readtoc(struct s_drive_stuff *);
static int mcdx_playtrk(struct s_drive_stuff *, const struct cdrom_ti *);
static int mcdx_playmsf(struct s_drive_stuff *, const struct cdrom_msf *);
static int mcdx_setattentuator(struct s_drive_stuff *,
                               struct cdrom_volctrl *, int);

/* static variables ************************************************/

static int mcdx_drive_map[][2] = MCDX_DRIVEMAP;
static struct s_drive_stuff *mcdx_stuffp[MCDX_NDRIVES];
static spinlock_t mcdx_lock = SPIN_LOCK_UNLOCKED;
static struct request_queue *mcdx_queue;
MODULE_PARM(mcdx, "1-4i");

static struct cdrom_device_ops mcdx_dops = {
        .open           = mcdx_open,
        .release        = mcdx_close,
        .media_changed  = mcdx_media_changed,
        .tray_move      = mcdx_tray_move,
        .lock_door      = mcdx_lockdoor,
        .audio_ioctl    = mcdx_audio_ioctl,
        .capability     = CDC_OPEN_TRAY | CDC_LOCK | CDC_MEDIA_CHANGED |
                          CDC_PLAY_AUDIO | CDC_DRIVE_STATUS,
};

/* KERNEL INTERFACE FUNCTIONS **************************************/


static int mcdx_audio_ioctl(struct cdrom_device_info *cdi,
                            unsigned int cmd, void *arg)
{
        struct s_drive_stuff *stuffp = cdi->handle;

        if (!stuffp->present)
                return -ENXIO;

        if (stuffp->xxx) {
                if (-1 == mcdx_requesttocdata(stuffp, &stuffp->di, 1)) {
                        stuffp->lastsector = -1;
                } else {
                        stuffp->lastsector = (CD_FRAMESIZE / 512)
                            * msf2log(&stuffp->di.msf_leadout) - 1;
                }

                if (stuffp->toc) {
                        kfree(stuffp->toc);
                        stuffp->toc = NULL;
                        if (-1 == mcdx_readtoc(stuffp))
                                return -1;
                }

                stuffp->xxx = 0;
        }

        switch (cmd) {
        case CDROMSTART:{
                        xtrace(IOCTL, "ioctl() START\n");
                        /* Spin up the drive.  Don't think we can do this.
                           * For now, ignore it.
                         */
                        return 0;
                }

        case CDROMSTOP:{
                        xtrace(IOCTL, "ioctl() STOP\n");
                        stuffp->audiostatus = CDROM_AUDIO_INVALID;
                        if (-1 == mcdx_stop(stuffp, 1))
                                return -EIO;
                        return 0;
                }

        case CDROMPLAYTRKIND:{
                        struct cdrom_ti *ti = (struct cdrom_ti *) arg;

                        xtrace(IOCTL, "ioctl() PLAYTRKIND\n");
                        if ((ti->cdti_trk0 < stuffp->di.n_first)
                            || (ti->cdti_trk0 > stuffp->di.n_last)
                            || (ti->cdti_trk1 < stuffp->di.n_first))
                                return -EINVAL;
                        if (ti->cdti_trk1 > stuffp->di.n_last)
                                ti->cdti_trk1 = stuffp->di.n_last;
                        xtrace(PLAYTRK, "ioctl() track %d to %d\n",
                               ti->cdti_trk0, ti->cdti_trk1);
                        return mcdx_playtrk(stuffp, ti);
                }

        case CDROMPLAYMSF:{
                        struct cdrom_msf *msf = (struct cdrom_msf *) arg;

                        xtrace(IOCTL, "ioctl() PLAYMSF\n");

                        if ((stuffp->audiostatus == CDROM_AUDIO_PLAY)
                            && (-1 == mcdx_hold(stuffp, 1)))
                                return -EIO;

                        msf->cdmsf_min0 = uint2bcd(msf->cdmsf_min0);
                        msf->cdmsf_sec0 = uint2bcd(msf->cdmsf_sec0);
                        msf->cdmsf_frame0 = uint2bcd(msf->cdmsf_frame0);

                        msf->cdmsf_min1 = uint2bcd(msf->cdmsf_min1);
                        msf->cdmsf_sec1 = uint2bcd(msf->cdmsf_sec1);
                        msf->cdmsf_frame1 = uint2bcd(msf->cdmsf_frame1);

                        stuffp->stop.dt.minute = msf->cdmsf_min1;
                        stuffp->stop.dt.second = msf->cdmsf_sec1;
                        stuffp->stop.dt.frame = msf->cdmsf_frame1;

                        return mcdx_playmsf(stuffp, msf);
                }

        case CDROMRESUME:{
                        xtrace(IOCTL, "ioctl() RESUME\n");
                        return mcdx_playtrk(stuffp, NULL);
                }

        case CDROMREADTOCENTRY:{
                        struct cdrom_tocentry *entry =
                            (struct cdrom_tocentry *) arg;
                        struct s_subqcode *tp = NULL;
                        xtrace(IOCTL, "ioctl() READTOCENTRY\n");

                        if (-1 == mcdx_readtoc(stuffp))
                                return -1;
                        if (entry->cdte_track == CDROM_LEADOUT)
                                tp = &stuffp->toc[stuffp->di.n_last -
                                                  stuffp->di.n_first + 1];
                        else if (entry->cdte_track > stuffp->di.n_last
                                 || entry->cdte_track < stuffp->di.n_first)
                                return -EINVAL;
                        else
                                tp = &stuffp->toc[entry->cdte_track -
                                                  stuffp->di.n_first];

                        if (NULL == tp)
                                return -EIO;
                        entry->cdte_adr = tp->control;
                        entry->cdte_ctrl = tp->control >> 4;
                        /* Always return stuff in MSF, and let the Uniform cdrom driver
                           worry about what the user actually wants */
                        entry->cdte_addr.msf.minute =
                            bcd2uint(tp->dt.minute);
                        entry->cdte_addr.msf.second =
                            bcd2uint(tp->dt.second);
                        entry->cdte_addr.msf.frame =
                            bcd2uint(tp->dt.frame);
                        return 0;
                }

        case CDROMSUBCHNL:{
                        struct cdrom_subchnl *sub =
                            (struct cdrom_subchnl *) arg;
                        struct s_subqcode q;

                        xtrace(IOCTL, "ioctl() SUBCHNL\n");

                        if (-1 == mcdx_requestsubqcode(stuffp, &q, 2))
                                return -EIO;

                        xtrace(SUBCHNL, "audiostatus: %x\n",
                               stuffp->audiostatus);
                        sub->cdsc_audiostatus = stuffp->audiostatus;
                        sub->cdsc_adr = q.control;
                        sub->cdsc_ctrl = q.control >> 4;
                        sub->cdsc_trk = bcd2uint(q.tno);
                        sub->cdsc_ind = bcd2uint(q.index);

                        xtrace(SUBCHNL, "trk %d, ind %d\n",
                               sub->cdsc_trk, sub->cdsc_ind);
                        /* Always return stuff in MSF, and let the Uniform cdrom driver
                           worry about what the user actually wants */
                        sub->cdsc_absaddr.msf.minute =
                            bcd2uint(q.dt.minute);
                        sub->cdsc_absaddr.msf.second =
                            bcd2uint(q.dt.second);
                        sub->cdsc_absaddr.msf.frame = bcd2uint(q.dt.frame);
                        sub->cdsc_reladdr.msf.minute =
                            bcd2uint(q.tt.minute);
                        sub->cdsc_reladdr.msf.second =
                            bcd2uint(q.tt.second);
                        sub->cdsc_reladdr.msf.frame = bcd2uint(q.tt.frame);
                        xtrace(SUBCHNL,
                               "msf: abs %02d:%02d:%02d, rel %02d:%02d:%02d\n",
                               sub->cdsc_absaddr.msf.minute,
                               sub->cdsc_absaddr.msf.second,
                               sub->cdsc_absaddr.msf.frame,
                               sub->cdsc_reladdr.msf.minute,
                               sub->cdsc_reladdr.msf.second,
                               sub->cdsc_reladdr.msf.frame);

                        return 0;
                }

        case CDROMREADTOCHDR:{
                        struct cdrom_tochdr *toc =
                            (struct cdrom_tochdr *) arg;

                        xtrace(IOCTL, "ioctl() READTOCHDR\n");
                        toc->cdth_trk0 = stuffp->di.n_first;
                        toc->cdth_trk1 = stuffp->di.n_last;
                        xtrace(TOCHDR,
                               "ioctl() track0 = %d, track1 = %d\n",
                               stuffp->di.n_first, stuffp->di.n_last);
                        return 0;
                }

        case CDROMPAUSE:{
                        xtrace(IOCTL, "ioctl() PAUSE\n");
                        if (stuffp->audiostatus != CDROM_AUDIO_PLAY)
                                return -EINVAL;
                        if (-1 == mcdx_stop(stuffp, 1))
                                return -EIO;
                        stuffp->audiostatus = CDROM_AUDIO_PAUSED;
                        if (-1 ==
                            mcdx_requestsubqcode(stuffp, &stuffp->start,
                                                 1))
                                return -EIO;
                        return 0;
                }

        case CDROMMULTISESSION:{
                        struct cdrom_multisession *ms =
                            (struct cdrom_multisession *) arg;
                        xtrace(IOCTL, "ioctl() MULTISESSION\n");
                        /* Always return stuff in LBA, and let the Uniform cdrom driver
                           worry about what the user actually wants */
                        ms->addr.lba = msf2log(&stuffp->multi.msf_last);
                        ms->xa_flag = !!stuffp->multi.multi;
                        xtrace(MS,
                               "ioctl() (%d, 0x%08x [%02x:%02x.%02x])\n",
                               ms->xa_flag, ms->addr.lba,
                               stuffp->multi.msf_last.minute,
                               stuffp->multi.msf_last.second,
                               stuffp->multi.msf_last.frame);

                        return 0;
                }

        case CDROMEJECT:{
                        xtrace(IOCTL, "ioctl() EJECT\n");
                        if (stuffp->users > 1)
                                return -EBUSY;
                        return (mcdx_tray_move(cdi, 1));
                }

        case CDROMCLOSETRAY:{
                        xtrace(IOCTL, "ioctl() CDROMCLOSETRAY\n");
                        return (mcdx_tray_move(cdi, 0));
                }

        case CDROMVOLCTRL:{
                        struct cdrom_volctrl *volctrl =
                            (struct cdrom_volctrl *) arg;
                        xtrace(IOCTL, "ioctl() VOLCTRL\n");

#if 0                           /* not tested! */
                        /* adjust for the weirdness of workman (md) */
                        /* can't test it (hs) */
                        volctrl.channel2 = volctrl.channel1;
                        volctrl.channel1 = volctrl.channel3 = 0x00;
#endif
                        return mcdx_setattentuator(stuffp, volctrl, 2);
                }

        default:
                return -EINVAL;
        }
}

void do_mcdx_request(request_queue_t * q)
{
        struct s_drive_stuff *stuffp;
        struct request *req;

      again:

        req = elv_next_request(q);
        if (!req)
                return;

        stuffp = req->rq_disk->private_data;

        if (!stuffp->present) {
                xwarn("do_request(): bad device: %s\n",req->rq_disk->disk_name);
                xtrace(REQUEST, "end_request(0): bad device\n");
                end_request(req, 0);
                return;
        }

        if (stuffp->audio) {
                xwarn("do_request() attempt to read from audio cd\n");
                xtrace(REQUEST, "end_request(0): read from audio\n");
                end_request(req, 0);
                return;
        }

        xtrace(REQUEST, "do_request() (%lu + %lu)\n",
               req->sector, req->nr_sectors);

        if (req->cmd != READ) {
                xwarn("do_request(): non-read command to cd!!\n");
                xtrace(REQUEST, "end_request(0): write\n");
                end_request(req, 0);
                return;
        }
        else {
                stuffp->status = 0;
                while (req->nr_sectors) {
                        int i;

                        i = mcdx_transfer(stuffp,
                                          req->buffer,
                                          req->sector,
                                          req->nr_sectors);

                        if (i == -1) {
                                end_request(req, 0);
                                goto again;
                        }
                        req->sector += i;
                        req->nr_sectors -= i;
                        req->buffer += (i * 512);
                }
                end_request(req, 1);
                goto again;

                xtrace(REQUEST, "end_request(1)\n");
                end_request(req, 1);
        }

        goto again;
}

static int mcdx_open(struct cdrom_device_info *cdi, int purpose)
{
        struct s_drive_stuff *stuffp;
        xtrace(OPENCLOSE, "open()\n");
        stuffp = cdi->handle;
        if (!stuffp->present)
                return -ENXIO;

        /* Make the modules looking used ... (thanx bjorn).
         * But we shouldn't forget to decrement the module counter
         * on error return */

        /* this is only done to test if the drive talks with us */
        if (-1 == mcdx_getstatus(stuffp, 1))
                return -EIO;

        if (stuffp->xxx) {

                xtrace(OPENCLOSE, "open() media changed\n");
                stuffp->audiostatus = CDROM_AUDIO_INVALID;
                stuffp->readcmd = 0;
                xtrace(OPENCLOSE, "open() Request multisession info\n");
                if (-1 ==
                    mcdx_requestmultidiskinfo(stuffp, &stuffp->multi, 6))
                        xinfo("No multidiskinfo\n");
        } else {
                /* multisession ? */
                if (!stuffp->multi.multi)
                        stuffp->multi.msf_last.second = 2;

                xtrace(OPENCLOSE, "open() MS: %d, last @ %02x:%02x.%02x\n",
                       stuffp->multi.multi,
                       stuffp->multi.msf_last.minute,
                       stuffp->multi.msf_last.second,
                       stuffp->multi.msf_last.frame);

                {;
                }               /* got multisession information */
                /* request the disks table of contents (aka diskinfo) */
                if (-1 == mcdx_requesttocdata(stuffp, &stuffp->di, 1)) {

                        stuffp->lastsector = -1;

                } else {

                        stuffp->lastsector = (CD_FRAMESIZE / 512)
                            * msf2log(&stuffp->di.msf_leadout) - 1;

                        xtrace(OPENCLOSE,
                               "open() start %d (%02x:%02x.%02x) %d\n",
                               stuffp->di.n_first,
                               stuffp->di.msf_first.minute,
                               stuffp->di.msf_first.second,
                               stuffp->di.msf_first.frame,
                               msf2log(&stuffp->di.msf_first));
                        xtrace(OPENCLOSE,
                               "open() last %d (%02x:%02x.%02x) %d\n",
                               stuffp->di.n_last,
                               stuffp->di.msf_leadout.minute,
                               stuffp->di.msf_leadout.second,
                               stuffp->di.msf_leadout.frame,
                               msf2log(&stuffp->di.msf_leadout));
                }

                if (stuffp->toc) {
                        xtrace(MALLOC, "open() free old toc @ %p\n",
                               stuffp->toc);
                        kfree(stuffp->toc);

                        stuffp->toc = NULL;
                }

                xtrace(OPENCLOSE, "open() init irq generation\n");
                if (-1 == mcdx_config(stuffp, 1))
                        return -EIO;
#if FALLBACK
                /* Set the read speed */
                xwarn("AAA %x AAA\n", stuffp->readcmd);
                if (stuffp->readerrs)
                        stuffp->readcmd = READ1X;
                else
                        stuffp->readcmd =
                            stuffp->present | SINGLE ? READ1X : READ2X;
                xwarn("XXX %x XXX\n", stuffp->readcmd);
#else
                stuffp->readcmd =
                    stuffp->present | SINGLE ? READ1X : READ2X;
#endif

                /* try to get the first sector, iff any ... */
                if (stuffp->lastsector >= 0) {
                        char buf[512];
                        int ans;
                        int tries;

                        stuffp->xa = 0;
                        stuffp->audio = 0;

                        for (tries = 6; tries; tries--) {

                                stuffp->introk = 1;

                                xtrace(OPENCLOSE, "open() try as %s\n",
                                       stuffp->xa ? "XA" : "normal");
                                /* set data mode */
                                if (-1 == (ans = mcdx_setdatamode(stuffp,
                                                                  stuffp->
                                                                  xa ?
                                                                  MODE2 :
                                                                  MODE1,
                                                                  1))) {
                                        /* return -EIO; */
                                        stuffp->xa = 0;
                                        break;
                                }

                                if ((stuffp->audio = e_audio(ans)))
                                        break;

                                while (0 ==
                                       (ans =
                                        mcdx_transfer(stuffp, buf, 0, 1)));

                                if (ans == 1)
                                        break;
                                stuffp->xa = !stuffp->xa;
                        }
                }
                /* xa disks will be read in raw mode, others not */
                if (-1 == mcdx_setdrivemode(stuffp,
                                            stuffp->xa ? RAW : COOKED,
                                            1))
                        return -EIO;
                if (stuffp->audio) {
                        xinfo("open() audio disk found\n");
                } else if (stuffp->lastsector >= 0) {
                        xinfo("open() %s%s disk found\n",
                              stuffp->xa ? "XA / " : "",
                              stuffp->multi.
                              multi ? "Multi Session" : "Single Session");
                }
        }
        stuffp->xxx = 0;
        stuffp->users++;
        return 0;
}

static void mcdx_close(struct cdrom_device_info *cdi)
{
        struct s_drive_stuff *stuffp;

        xtrace(OPENCLOSE, "close()\n");

        stuffp = cdi->handle;

        --stuffp->users;
}

static int mcdx_media_changed(struct cdrom_device_info *cdi, int disc_nr)
/*      Return: 1 if media changed since last call to this function
                        0 otherwise */
{
        struct s_drive_stuff *stuffp;

        xinfo("mcdx_media_changed called for device %s\n", cdi->name);

        stuffp = cdi->handle;
        mcdx_getstatus(stuffp, 1);

        if (stuffp->yyy == 0)
                return 0;

        stuffp->yyy = 0;
        return 1;
}

#ifndef MODULE
static int __init mcdx_setup(char *str)
{
        int pi[4];
        (void) get_options(str, ARRAY_SIZE(pi), pi);

        if (pi[0] > 0)
                mcdx_drive_map[0][0] = pi[1];
        if (pi[0] > 1)
                mcdx_drive_map[0][1] = pi[2];
        return 1;
}

__setup("mcdx=", mcdx_setup);

#endif

/* DIRTY PART ******************************************************/

static void mcdx_delay(struct s_drive_stuff *stuff, long jifs)
/* This routine is used for sleeping.
 * A jifs value <0 means NO sleeping,
 *              =0 means minimal sleeping (let the kernel
 *                 run for other processes)
 *              >0 means at least sleep for that amount.
 *      May be we could use a simple count loop w/ jumps to itself, but
 *      I wanna make this independent of cpu speed. [1 jiffy is 1/HZ] sec */
{
        if (jifs < 0)
                return;

        xtrace(SLEEP, "*** delay: sleepq\n");
        interruptible_sleep_on_timeout(&stuff->sleepq, jifs);
        xtrace(SLEEP, "delay awoken\n");
        if (signal_pending(current)) {
                xtrace(SLEEP, "got signal\n");
        }
}

static irqreturn_t mcdx_intr(int irq, void *dev_id, struct pt_regs *regs)
{
        struct s_drive_stuff *stuffp = dev_id;
        unsigned char b;

        if (stuffp == NULL) {
                xwarn("mcdx: no device for intr %d\n", irq);
                return IRQ_NONE;
        }
#ifdef AK2
        if (!stuffp->busy && stuffp->pending)
                stuffp->int_err = 1;

#endif                          /* AK2 */
        /* get the interrupt status */
        b = inb(stuffp->rreg_status);
        stuffp->introk = ~b & MCDX_RBIT_DTEN;

        /* NOTE: We only should get interrupts if the data we
         * requested are ready to transfer.
         * But the drive seems to generate ``asynchronous'' interrupts
         * on several error conditions too.  (Despite the err int enable
         * setting during initialisation) */

        /* if not ok, read the next byte as the drives status */
        if (!stuffp->introk) {
                xtrace(IRQ, "intr() irq %d hw status 0x%02x\n", irq, b);
                if (~b & MCDX_RBIT_STEN) {
                        xinfo("intr() irq %d    status 0x%02x\n",
                              irq, inb(stuffp->rreg_data));
                } else {
                        xinfo("intr() irq %d ambiguous hw status\n", irq);
                }
        } else {
                xtrace(IRQ, "irq() irq %d ok, status %02x\n", irq, b);
        }

        stuffp->busy = 0;
        wake_up_interruptible(&stuffp->busyq);
        return IRQ_HANDLED;
}


static int mcdx_talk(struct s_drive_stuff *stuffp,
          const unsigned char *cmd, size_t cmdlen,
          void *buffer, size_t size, unsigned int timeout, int tries)
/* Send a command to the drive, wait for the result.
 * returns -1 on timeout, drive status otherwise
 * If buffer is not zero, the result (length size) is stored there.
 * If buffer is zero the size should be the number of bytes to read
 * from the drive.  These bytes are discarded.
 */
{
        int st;
        char c;
        int discard;

        /* Somebody wants the data read? */
        if ((discard = (buffer == NULL)))
                buffer = &c;

        while (stuffp->lock) {
                xtrace(SLEEP, "*** talk: lockq\n");
                interruptible_sleep_on(&stuffp->lockq);
                xtrace(SLEEP, "talk: awoken\n");
        }

        stuffp->lock = 1;

        /* An operation other then reading data destroys the
           * data already requested and remembered in stuffp->request, ... */
        stuffp->valid = 0;

#if MCDX_DEBUG & TALK
        {
                unsigned char i;
                xtrace(TALK,
                       "talk() %d / %d tries, res.size %d, command 0x%02x",
                       tries, timeout, size, (unsigned char) cmd[0]);
                for (i = 1; i < cmdlen; i++)
                        xtrace(TALK, " 0x%02x", cmd[i]);
                xtrace(TALK, "\n");
        }
#endif

        /*  give up if all tries are done (bad) or if the status
         *  st != -1 (good) */
        for (st = -1; st == -1 && tries; tries--) {

                char *bp = (char *) buffer;
                size_t sz = size;

                outsb(stuffp->wreg_data, cmd, cmdlen);
                xtrace(TALK, "talk() command sent\n");

                /* get the status byte */
                if (-1 == mcdx_getval(stuffp, timeout, 0, bp)) {
                        xinfo("talk() %02x timed out (status), %d tr%s left\n",
                             cmd[0], tries - 1, tries == 2 ? "y" : "ies");
                        continue;
                }
                st = *bp;
                sz--;
                if (!discard)
                        bp++;

                xtrace(TALK, "talk() got status 0x%02x\n", st);

                /* command error? */
                if (e_cmderr(st)) {
                        xwarn("command error cmd = %02x %s \n",
                              cmd[0], cmdlen > 1 ? "..." : "");
                        st = -1;
                        continue;
                }

                /* audio status? */
                if (stuffp->audiostatus == CDROM_AUDIO_INVALID)
                        stuffp->audiostatus =
                            e_audiobusy(st) ? CDROM_AUDIO_PLAY :
                            CDROM_AUDIO_NO_STATUS;
                else if (stuffp->audiostatus == CDROM_AUDIO_PLAY
                         && e_audiobusy(st) == 0)
                        stuffp->audiostatus = CDROM_AUDIO_COMPLETED;

                /* media change? */
                if (e_changed(st)) {
                        xinfo("talk() media changed\n");
                        stuffp->xxx = stuffp->yyy = 1;
                }

                /* now actually get the data */
                while (sz--) {
                        if (-1 == mcdx_getval(stuffp, timeout, 0, bp)) {
                                xinfo("talk() %02x timed out (data), %d tr%s left\n",
                                     cmd[0], tries - 1,
                                     tries == 2 ? "y" : "ies");
                                st = -1;
                                break;
                        }
                        if (!discard)
                                bp++;
                        xtrace(TALK, "talk() got 0x%02x\n", *(bp - 1));
                }
        }

#if !MCDX_QUIET
        if (!tries && st == -1)
                xinfo("talk() giving up\n");
#endif

        stuffp->lock = 0;
        wake_up_interruptible(&stuffp->lockq);

        xtrace(TALK, "talk() done with 0x%02x\n", st);
        return st;
}

/* MODULE STUFF ***********************************************************/

int __mcdx_init(void)
{
        int i;
        int drives = 0;

        mcdx_init();
        for (i = 0; i < MCDX_NDRIVES; i++) {
                if (mcdx_stuffp[i]) {
                        xtrace(INIT, "init_module() drive %d stuff @ %p\n",
                               i, mcdx_stuffp[i]);
                        drives++;
                }
        }

        if (!drives)
                return -EIO;

        return 0;
}

void __exit mcdx_exit(void)
{
        int i;

        xinfo("cleanup_module called\n");

        for (i = 0; i < MCDX_NDRIVES; i++) {
                struct s_drive_stuff *stuffp = mcdx_stuffp[i];
                if (!stuffp)
                        continue;
                del_gendisk(stuffp->disk);
                if (unregister_cdrom(&stuffp->info)) {
                        printk(KERN_WARNING "Can't unregister cdrom mcdx\n");
                        continue;
                }
                put_disk(stuffp->disk);
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                free_irq(stuffp->irq, NULL);
                if (stuffp->toc) {
                        xtrace(MALLOC, "cleanup_module() free toc @ %p\n",
                               stuffp->toc);
                        kfree(stuffp->toc);
                }
                xtrace(MALLOC, "cleanup_module() free stuffp @ %p\n",
                       stuffp);
                mcdx_stuffp[i] = NULL;
                kfree(stuffp);
        }

        if (unregister_blkdev(MAJOR_NR, "mcdx") != 0) {
                xwarn("cleanup() unregister_blkdev() failed\n");
        }
        blk_cleanup_queue(mcdx_queue);
#if !MCDX_QUIET
        else
        xinfo("cleanup() succeeded\n");
#endif
}

#ifdef MODULE
module_init(__mcdx_init);
#endif
module_exit(mcdx_exit);


/* Support functions ************************************************/

int __init mcdx_init_drive(int drive)
{
        struct s_version version;
        struct gendisk *disk;
        struct s_drive_stuff *stuffp;
        int size = sizeof(*stuffp);
        char msg[80];

        xtrace(INIT, "init() try drive %d\n", drive);

        xtrace(INIT, "kmalloc space for stuffpt's\n");
        xtrace(MALLOC, "init() malloc %d bytes\n", size);
        if (!(stuffp = kmalloc(size, GFP_KERNEL))) {
                xwarn("init() malloc failed\n");
                return 1;
        }

        disk = alloc_disk(1);
        if (!disk) {
                xwarn("init() malloc failed\n");
                kfree(stuffp);
                return 1;
        }

        xtrace(INIT, "init() got %d bytes for drive stuff @ %p\n",
               sizeof(*stuffp), stuffp);

        /* set default values */
        memset(stuffp, 0, sizeof(*stuffp));

        stuffp->present = 0;    /* this should be 0 already */
        stuffp->toc = NULL;     /* this should be NULL already */

        /* setup our irq and i/o addresses */
        stuffp->irq = irq(mcdx_drive_map[drive]);
        stuffp->wreg_data = stuffp->rreg_data = port(mcdx_drive_map[drive]);
        stuffp->wreg_reset = stuffp->rreg_status = stuffp->wreg_data + 1;
        stuffp->wreg_hcon = stuffp->wreg_reset + 1;
        stuffp->wreg_chn = stuffp->wreg_hcon + 1;

        init_waitqueue_head(&stuffp->busyq);
        init_waitqueue_head(&stuffp->lockq);
        init_waitqueue_head(&stuffp->sleepq);

        /* check if i/o addresses are available */
        if (!request_region(stuffp->wreg_data, MCDX_IO_SIZE, "mcdx")) {
                xwarn("0x%03x,%d: Init failed. "
                      "I/O ports (0x%03x..0x%03x) already in use.\n",
                      stuffp->wreg_data, stuffp->irq,
                      stuffp->wreg_data,
                      stuffp->wreg_data + MCDX_IO_SIZE - 1);
                xtrace(MALLOC, "init() free stuffp @ %p\n", stuffp);
                kfree(stuffp);
                put_disk(disk);
                xtrace(INIT, "init() continue at next drive\n");
                return 0;       /* next drive */
        }

        xtrace(INIT, "init() i/o port is available at 0x%03x\n"
               stuffp->wreg_data);
        xtrace(INIT, "init() hardware reset\n");
        mcdx_reset(stuffp, HARD, 1);

        xtrace(INIT, "init() get version\n");
        if (-1 == mcdx_requestversion(stuffp, &version, 4)) {
                /* failed, next drive */
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                xwarn("%s=0x%03x,%d: Init failed. Can't get version.\n",
                      MCDX, stuffp->wreg_data, stuffp->irq);
                xtrace(MALLOC, "init() free stuffp @ %p\n", stuffp);
                kfree(stuffp);
                put_disk(disk);
                xtrace(INIT, "init() continue at next drive\n");
                return 0;
        }

        switch (version.code) {
        case 'D':
                stuffp->readcmd = READ2X;
                stuffp->present = DOUBLE | DOOR | MULTI;
                break;
        case 'F':
                stuffp->readcmd = READ1X;
                stuffp->present = SINGLE | DOOR | MULTI;
                break;
        case 'M':
                stuffp->readcmd = READ1X;
                stuffp->present = SINGLE;
                break;
        default:
                stuffp->present = 0;
                break;
        }

        stuffp->playcmd = READ1X;

        if (!stuffp->present) {
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                xwarn("%s=0x%03x,%d: Init failed. No Mitsumi CD-ROM?.\n",
                      MCDX, stuffp->wreg_data, stuffp->irq);
                kfree(stuffp);
                put_disk(disk);
                return 0;       /* next drive */
        }

        xtrace(INIT, "init() register blkdev\n");
        if (register_blkdev(MAJOR_NR, "mcdx")) {
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                kfree(stuffp);
                put_disk(disk);
                return 1;
        }

        mcdx_queue = blk_init_queue(do_mcdx_request, &mcdx_lock);
        if (!mcdx_queue) {
                unregister_blkdev(MAJOR_NR, "mcdx");
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                kfree(stuffp);
                put_disk(disk);
                return 1;
        }

        xtrace(INIT, "init() subscribe irq and i/o\n");
        if (request_irq(stuffp->irq, mcdx_intr, SA_INTERRUPT, "mcdx", stuffp)) {
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                xwarn("%s=0x%03x,%d: Init failed. Can't get irq (%d).\n",
                      MCDX, stuffp->wreg_data, stuffp->irq, stuffp->irq);
                stuffp->irq = 0;
                blk_cleanup_queue(mcdx_queue);
                kfree(stuffp);
                put_disk(disk);
                return 0;
        }

        xtrace(INIT, "init() get garbage\n");
        {
                int i;
                mcdx_delay(stuffp, HZ / 2);
                for (i = 100; i; i--)
                        (void) inb(stuffp->rreg_status);
        }


#if WE_KNOW_WHY
        /* irq 11 -> channel register */
        outb(0x50, stuffp->wreg_chn);
#endif

        xtrace(INIT, "init() set non dma but irq mode\n");
        mcdx_config(stuffp, 1);

        stuffp->info.ops = &mcdx_dops;
        stuffp->info.speed = 2;
        stuffp->info.capacity = 1;
        stuffp->info.handle = stuffp;
        sprintf(stuffp->info.name, "mcdx%d", drive);
        disk->major = MAJOR_NR;
        disk->first_minor = drive;
        strcpy(disk->disk_name, stuffp->info.name);
        disk->fops = &mcdx_bdops;
        disk->flags = GENHD_FL_CD;
        stuffp->disk = disk;

        sprintf(msg, " mcdx: Mitsumi CD-ROM installed at 0x%03x, irq %d."
                " (Firmware version %c %x)\n",
                stuffp->wreg_data, stuffp->irq, version.code, version.ver);
        mcdx_stuffp[drive] = stuffp;
        xtrace(INIT, "init() mcdx_stuffp[%d] = %p\n", drive, stuffp);
        if (register_cdrom(&stuffp->info) != 0) {
                printk("Cannot register Mitsumi CD-ROM!\n");
                free_irq(stuffp->irq, NULL);
                release_region(stuffp->wreg_data, MCDX_IO_SIZE);
                kfree(stuffp);
                put_disk(disk);
                if (unregister_blkdev(MAJOR_NR, "mcdx") != 0)
                        xwarn("cleanup() unregister_blkdev() failed\n");
                blk_cleanup_queue(mcdx_queue);
                return 2;
        }
        disk->private_data = stuffp;
        disk->queue = mcdx_queue;
        add_disk(disk);
        printk(msg);
        return 0;
}

int __init mcdx_init(void)
{
        int drive;
#ifdef MODULE
        xwarn("Version 2.14(hs) for " UTS_RELEASE "\n");
#else
        xwarn("Version 2.14(hs) \n");
#endif

        xwarn("$Id: mcdx.c,v 1.21 1997/01/26 07:12:59 davem Exp $\n");

        /* zero the pointer array */
        for (drive = 0; drive < MCDX_NDRIVES; drive++)
                mcdx_stuffp[drive] = NULL;

        /* do the initialisation */
        for (drive = 0; drive < MCDX_NDRIVES; drive++) {
                switch (mcdx_init_drive(drive)) {
                case 2:
                        return -EIO;
                case 1:
                        break;
                }
        }
        return 0;
}

static int mcdx_transfer(struct s_drive_stuff *stuffp,
              char *p, int sector, int nr_sectors)
/*      This seems to do the actually transfer.  But it does more.  It
        keeps track of errors occurred and will (if possible) fall back
        to single speed on error.
        Return: -1 on timeout or other error
                        else status byte (as in stuff->st) */
{
        int ans;

        ans = mcdx_xfer(stuffp, p, sector, nr_sectors);
        return ans;
#if FALLBACK
        if (-1 == ans)
                stuffp->readerrs++;
        else
                return ans;

        if (stuffp->readerrs && stuffp->readcmd == READ1X) {
                xwarn("XXX Already reading 1x -- no chance\n");
                return -1;
        }

        xwarn("XXX Fallback to 1x\n");

        stuffp->readcmd = READ1X;
        return mcdx_transfer(stuffp, p, sector, nr_sectors);
#endif

}


static int mcdx_xfer(struct s_drive_stuff *stuffp,
                     char *p, int sector, int nr_sectors)
/*      This does actually the transfer from the drive.
        Return: -1 on timeout or other error
                        else status byte (as in stuff->st) */
{
        int border;
        int done = 0;
        long timeout;

        if (stuffp->audio) {
                xwarn("Attempt to read from audio CD.\n");
                return -1;
        }

        if (!stuffp->readcmd) {
                xinfo("Can't transfer from missing disk.\n");
                return -1;
        }

        while (stuffp->lock) {
                interruptible_sleep_on(&stuffp->lockq);
        }

        if (stuffp->valid && (sector >= stuffp->pending)
            && (sector < stuffp->low_border)) {

                /* All (or at least a part of the sectors requested) seems
                   * to be already requested, so we don't need to bother the
                   * drive with new requests ...
                   * Wait for the drive become idle, but first
                   * check for possible occurred errors --- the drive
                   * seems to report them asynchronously */


                border = stuffp->high_border < (border =
                                                sector + nr_sectors)
                    ? stuffp->high_border : border;

                stuffp->lock = current->pid;

                do {

                        while (stuffp->busy) {

                                timeout =
                                    interruptible_sleep_on_timeout
                                    (&stuffp->busyq, 5 * HZ);

                                if (!stuffp->introk) {
                                        xtrace(XFER,
                                               "error via interrupt\n");
                                } else if (!timeout) {
                                        xtrace(XFER, "timeout\n");
                                } else if (signal_pending(current)) {
                                        xtrace(XFER, "signal\n");
                                } else
                                        continue;

                                stuffp->lock = 0;
                                stuffp->busy = 0;
                                stuffp->valid = 0;

                                wake_up_interruptible(&stuffp->lockq);
                                xtrace(XFER, "transfer() done (-1)\n");
                                return -1;
                        }

                        /* check if we need to set the busy flag (as we
                         * expect an interrupt */
                        stuffp->busy = (3 == (stuffp->pending & 3));

                        /* Test if it's the first sector of a block,
                         * there we have to skip some bytes as we read raw data */
                        if (stuffp->xa && (0 == (stuffp->pending & 3))) {
                                const int HEAD =
                                    CD_FRAMESIZE_RAW - CD_XA_TAIL -
                                    CD_FRAMESIZE;
                                insb(stuffp->rreg_data, p, HEAD);
                        }

                        /* now actually read the data */
                        insb(stuffp->rreg_data, p, 512);

                        /* test if it's the last sector of a block,
                         * if so, we have to handle XA special */
                        if ((3 == (stuffp->pending & 3)) && stuffp->xa) {
                                char dummy[CD_XA_TAIL];
                                insb(stuffp->rreg_data, &dummy[0], CD_XA_TAIL);
                        }

                        if (stuffp->pending == sector) {
                                p += 512;
                                done++;
                                sector++;
                        }
                } while (++(stuffp->pending) < border);

                stuffp->lock = 0;
                wake_up_interruptible(&stuffp->lockq);

        } else {

                /* The requested sector(s) is/are out of the
                 * already requested range, so we have to bother the drive
                 * with a new request. */

                static unsigned char cmd[] = {
                        0,
                        0, 0, 0,
                        0, 0, 0
                };

                cmd[0] = stuffp->readcmd;

                /* The numbers held in ->pending, ..., should be valid */
                stuffp->valid = 1;
                stuffp->pending = sector & ~3;

                /* do some sanity checks */
                if (stuffp->pending > stuffp->lastsector) {
                        xwarn
                            ("transfer() sector %d from nirvana requested.\n",
                             stuffp->pending);
                        stuffp->status = MCDX_ST_EOM;
                        stuffp->valid = 0;
                        xtrace(XFER, "transfer() done (-1)\n");
                        return -1;
                }

                if ((stuffp->low_border = stuffp->pending + DIRECT_SIZE)
                    > stuffp->lastsector + 1) {
                        xtrace(XFER, "cut low_border\n");
                        stuffp->low_border = stuffp->lastsector + 1;
                }
                if ((stuffp->high_border = stuffp->pending + REQUEST_SIZE)
                    > stuffp->lastsector + 1) {
                        xtrace(XFER, "cut high_border\n");
                        stuffp->high_border = stuffp->lastsector + 1;
                }

                {               /* Convert the sector to be requested to MSF format */
                        struct cdrom_msf0 pending;
                        log2msf(stuffp->pending / 4, &pending);
                        cmd[1] = pending.minute;
                        cmd[2] = pending.second;
                        cmd[3] = pending.frame;
                }

                cmd[6] =
                    (unsigned
                     char) ((stuffp->high_border - stuffp->pending) / 4);
                xtrace(XFER, "[%2d]\n", cmd[6]);

                stuffp->busy = 1;
                /* Now really issue the request command */
                outsb(stuffp->wreg_data, cmd, sizeof cmd);

        }
#ifdef AK2
        if (stuffp->int_err) {
                stuffp->valid = 0;
                stuffp->int_err = 0;
                return -1;
        }
#endif                          /* AK2 */

        stuffp->low_border = (stuffp->low_border +=
                              done) <
            stuffp->high_border ? stuffp->low_border : stuffp->high_border;

        return done;
}


/*      Access to elements of the mcdx_drive_map members */

static unsigned port(int *ip)
{
        return ip[0];
}
static int irq(int *ip)
{
        return ip[1];
}

/*      Misc number converters */

static unsigned int bcd2uint(unsigned char c)
{
        return (c >> 4) * 10 + (c & 0x0f);
}

static unsigned int uint2bcd(unsigned int ival)
{
        return ((ival / 10) << 4) | (ival % 10);
}

static void log2msf(unsigned int l, struct cdrom_msf0 *pmsf)
{
        l += CD_MSF_OFFSET;
        pmsf->minute = uint2bcd(l / 4500), l %= 4500;
        pmsf->second = uint2bcd(l / 75);
        pmsf->frame = uint2bcd(l % 75);
}

static unsigned int msf2log(const struct cdrom_msf0 *pmsf)
{
        return bcd2uint(pmsf->frame)
            + bcd2uint(pmsf->second) * 75
            + bcd2uint(pmsf->minute) * 4500 - CD_MSF_OFFSET;
}

int mcdx_readtoc(struct s_drive_stuff *stuffp)
/*  Read the toc entries from the CD,
 *  Return: -1 on failure, else 0 */
{

        if (stuffp->toc) {
                xtrace(READTOC, "ioctl() toc already read\n");
                return 0;
        }

        xtrace(READTOC, "ioctl() readtoc for %d tracks\n",
               stuffp->di.n_last - stuffp->di.n_first + 1);

        if (-1 == mcdx_hold(stuffp, 1))
                return -1;

        xtrace(READTOC, "ioctl() tocmode\n");
        if (-1 == mcdx_setdrivemode(stuffp, TOC, 1))
                return -EIO;

        /* all seems to be ok so far ... malloc */
        {
                int size;
                size =
                    sizeof(struct s_subqcode) * (stuffp->di.n_last -
                                                 stuffp->di.n_first + 2);

                xtrace(MALLOC, "ioctl() malloc %d bytes\n", size);
                stuffp->toc = kmalloc(size, GFP_KERNEL);
                if (!stuffp->toc) {
                        xwarn("Cannot malloc %d bytes for toc\n", size);
                        mcdx_setdrivemode(stuffp, DATA, 1);
                        return -EIO;
                }
        }

        /* now read actually the index */
        {
                int trk;
                int retries;

                for (trk = 0;
                     trk < (stuffp->di.n_last - stuffp->di.n_first + 1);
                     trk++)
                        stuffp->toc[trk].index = 0;

                for (retries = 300; retries; retries--) {       /* why 300? */
                        struct s_subqcode q;
                        unsigned int idx;

                        if (-1 == mcdx_requestsubqcode(stuffp, &q, 1)) {
                                mcdx_setdrivemode(stuffp, DATA, 1);
                                return -EIO;
                        }

                        idx = bcd2uint(q.index);

                        if ((idx > 0)
                            && (idx <= stuffp->di.n_last)
                            && (q.tno == 0)
                            && (stuffp->toc[idx - stuffp->di.n_first].
                                index == 0)) {
                                stuffp->toc[idx - stuffp->di.n_first] = q;
                                xtrace(READTOC,
                                       "ioctl() toc idx %d (trk %d)\n",
                                       idx, trk);
                                trk--;
                        }
                        if (trk == 0)
                                break;
                }
                memset(&stuffp->
                       toc[stuffp->di.n_last - stuffp->di.n_first + 1], 0,
                       sizeof(stuffp->toc[0]));
                stuffp->toc[stuffp->di.n_last - stuffp->di.n_first +
                            1].dt = stuffp->di.msf_leadout;
        }

        /* unset toc mode */
        xtrace(READTOC, "ioctl() undo toc mode\n");
        if (-1 == mcdx_setdrivemode(stuffp, DATA, 2))
                return -EIO;

#if MCDX_DEBUG && READTOC
        {
                int trk;
                for (trk = 0;
                     trk < (stuffp->di.n_last - stuffp->di.n_first + 2);
                     trk++)
                        xtrace(READTOC, "ioctl() %d readtoc %02x %02x %02x"
                               "  %02x:%02x.%02x  %02x:%02x.%02x\n",
                               trk + stuffp->di.n_first,
                               stuffp->toc[trk].control,
                               stuffp->toc[trk].tno,
                               stuffp->toc[trk].index,
                               stuffp->toc[trk].tt.minute,
                               stuffp->toc[trk].tt.second,
                               stuffp->toc[trk].tt.frame,
                               stuffp->toc[trk].dt.minute,
                               stuffp->toc[trk].dt.second,
                               stuffp->toc[trk].dt.frame);
        }
#endif

        return 0;
}

static int
mcdx_playmsf(struct s_drive_stuff *stuffp, const struct cdrom_msf *msf)
{
        unsigned char cmd[7] = {
                0, 0, 0, 0, 0, 0, 0
        };

        if (!stuffp->readcmd) {
                xinfo("Can't play from missing disk.\n");
                return -1;
        }

        cmd[0] = stuffp->playcmd;

        cmd[1] = msf->cdmsf_min0;
        cmd[2] = msf->cdmsf_sec0;
        cmd[3] = msf->cdmsf_frame0;
        cmd[4] = msf->cdmsf_min1;
        cmd[5] = msf->cdmsf_sec1;
        cmd[6] = msf->cdmsf_frame1;

        xtrace(PLAYMSF, "ioctl(): play %x "
               "%02x:%02x:%02x -- %02x:%02x:%02x\n",
               cmd[0], cmd[1], cmd[2], cmd[3], cmd[4], cmd[5], cmd[6]);

        outsb(stuffp->wreg_data, cmd, sizeof cmd);

        if (-1 == mcdx_getval(stuffp, 3 * HZ, 0, NULL)) {
                xwarn("playmsf() timeout\n");
                return -1;
        }

        stuffp->audiostatus = CDROM_AUDIO_PLAY;
        return 0;
}

static int
mcdx_playtrk(struct s_drive_stuff *stuffp, const struct cdrom_ti *ti)
{
        struct s_subqcode *p;
        struct cdrom_msf msf;

        if (-1 == mcdx_readtoc(stuffp))
                return -1;

        if (ti)
                p = &stuffp->toc[ti->cdti_trk0 - stuffp->di.n_first];
        else
                p = &stuffp->start;

        msf.cdmsf_min0 = p->dt.minute;
        msf.cdmsf_sec0 = p->dt.second;
        msf.cdmsf_frame0 = p->dt.frame;

        if (ti) {
                p = &stuffp->toc[ti->cdti_trk1 - stuffp->di.n_first + 1];
                stuffp->stop = *p;
        } else
                p = &stuffp->stop;

        msf.cdmsf_min1 = p->dt.minute;
        msf.cdmsf_sec1 = p->dt.second;
        msf.cdmsf_frame1 = p->dt.frame;

        return mcdx_playmsf(stuffp, &msf);
}


/* Drive functions ************************************************/

static int mcdx_tray_move(struct cdrom_device_info *cdi, int position)
{
        struct s_drive_stuff *stuffp = cdi->handle;

        if (!stuffp->present)
                return -ENXIO;
        if (!(stuffp->present & DOOR))
                return -ENOSYS;

        if (position)           /* 1: eject */
                return mcdx_talk(stuffp, "\xf6", 1, NULL, 1, 5 * HZ, 3);
        else                    /* 0: close */
                return mcdx_talk(stuffp, "\xf8", 1, NULL, 1, 5 * HZ, 3);
        return 1;
}

static int mcdx_stop(struct s_drive_stuff *stuffp, int tries)
{
        return mcdx_talk(stuffp, "\xf0", 1, NULL, 1, 2 * HZ, tries);
}

static int mcdx_hold(struct s_drive_stuff *stuffp, int tries)
{
        return mcdx_talk(stuffp, "\x70", 1, NULL, 1, 2 * HZ, tries);
}

static int mcdx_requestsubqcode(struct s_drive_stuff *stuffp,
                     struct s_subqcode *sub, int tries)
{
        char buf[11];
        int ans;

        if (-1 == (ans = mcdx_talk(stuffp, "\x20", 1, buf, sizeof(buf),
                                   2 * HZ, tries)))
                return -1;
        sub->control = buf[1];
        sub->tno = buf[2];
        sub->index = buf[3];
        sub->tt.minute = buf[4];
        sub->tt.second = buf[5];
        sub->tt.frame = buf[6];
        sub->dt.minute = buf[8];
        sub->dt.second = buf[9];
        sub->dt.frame = buf[10];

        return ans;
}

static int mcdx_requestmultidiskinfo(struct s_drive_stuff *stuffp,
                          struct s_multi *multi, int tries)
{
        char buf[5];
        int ans;

        if (stuffp->present & MULTI) {
                ans =
                    mcdx_talk(stuffp, "\x11", 1, buf, sizeof(buf), 2 * HZ,
                              tries);
                multi->multi = buf[1];
                multi->msf_last.minute = buf[2];
                multi->msf_last.second = buf[3];
                multi->msf_last.frame = buf[4];
                return ans;
        } else {
                multi->multi = 0;
                return 0;
        }
}

static int mcdx_requesttocdata(struct s_drive_stuff *stuffp, struct s_diskinfo *info,
                    int tries)
{
        char buf[9];
        int ans;
        ans =
            mcdx_talk(stuffp, "\x10", 1, buf, sizeof(buf), 2 * HZ, tries);
        if (ans == -1) {
                info->n_first = 0;
                info->n_last = 0;
        } else {
                info->n_first = bcd2uint(buf[1]);
                info->n_last = bcd2uint(buf[2]);
                info->msf_leadout.minute = buf[3];
                info->msf_leadout.second = buf[4];
                info->msf_leadout.frame = buf[5];
                info->msf_first.minute = buf[6];
                info->msf_first.second = buf[7];
                info->msf_first.frame = buf[8];
        }
        return ans;
}

static int mcdx_setdrivemode(struct s_drive_stuff *stuffp, enum drivemodes mode,
                  int tries)
{
        char cmd[2];
        int ans;

        xtrace(HW, "setdrivemode() %d\n", mode);

        if (-1 == (ans = mcdx_talk(stuffp, "\xc2", 1, cmd, sizeof(cmd), 5 * HZ, tries)))
                return -1;

        switch (mode) {
        case TOC:
                cmd[1] |= 0x04;
                break;
        case DATA:
                cmd[1] &= ~0x04;
                break;
        case RAW:
                cmd[1] |= 0x40;
                break;
        case COOKED:
                cmd[1] &= ~0x40;
                break;
        default:
                break;
        }
        cmd[0] = 0x50;
        return mcdx_talk(stuffp, cmd, 2, NULL, 1, 5 * HZ, tries);
}

static int mcdx_setdatamode(struct s_drive_stuff *stuffp, enum datamodes mode,
                 int tries)
{
        unsigned char cmd[2] = { 0xa0 };
        xtrace(HW, "setdatamode() %d\n", mode);
        switch (mode) {
        case MODE0:
                cmd[1] = 0x00;
                break;
        case MODE1:
                cmd[1] = 0x01;
                break;
        case MODE2:
                cmd[1] = 0x02;
                break;
        default:
                return -EINVAL;
        }
        return mcdx_talk(stuffp, cmd, 2, NULL, 1, 5 * HZ, tries);
}

static int mcdx_config(struct s_drive_stuff *stuffp, int tries)
{
        char cmd[4];

        xtrace(HW, "config()\n");

        cmd[0] = 0x90;

        cmd[1] = 0x10;          /* irq enable */
        cmd[2] = 0x05;          /* pre, err irq enable */

        if (-1 == mcdx_talk(stuffp, cmd, 3, NULL, 1, 1 * HZ, tries))
                return -1;

        cmd[1] = 0x02;          /* dma select */
        cmd[2] = 0x00;          /* no dma */

        return mcdx_talk(stuffp, cmd, 3, NULL, 1, 1 * HZ, tries);
}

static int mcdx_requestversion(struct s_drive_stuff *stuffp, struct s_version *ver,
                    int tries)
{
        char buf[3];
        int ans;

        if (-1 == (ans = mcdx_talk(stuffp, "\xdc",
                                   1, buf, sizeof(buf), 2 * HZ, tries)))
                return ans;

        ver->code = buf[1];
        ver->ver = buf[2];

        return ans;
}

static int mcdx_reset(struct s_drive_stuff *stuffp, enum resetmodes mode, int tries)
{
        if (mode == HARD) {
                outb(0, stuffp->wreg_chn);      /* no dma, no irq -> hardware */
                outb(0, stuffp->wreg_reset);    /* hw reset */
                return 0;
        } else
                return mcdx_talk(stuffp, "\x60", 1, NULL, 1, 5 * HZ, tries);
}

static int mcdx_lockdoor(struct cdrom_device_info *cdi, int lock)
{
        struct s_drive_stuff *stuffp = cdi->handle;
        char cmd[2] = { 0xfe };

        if (!(stuffp->present & DOOR))
                return -ENOSYS;
        if (stuffp->present & DOOR) {
                cmd[1] = lock ? 0x01 : 0x00;
                return mcdx_talk(stuffp, cmd, sizeof(cmd), NULL, 1, 5 * HZ, 3);
        } else
                return 0;
}

static int mcdx_getstatus(struct s_drive_stuff *stuffp, int tries)
{
        return mcdx_talk(stuffp, "\x40", 1, NULL, 1, 5 * HZ, tries);
}

static int
mcdx_getval(struct s_drive_stuff *stuffp, int to, int delay, char *buf)
{
        unsigned long timeout = to + jiffies;
        char c;

        if (!buf)
                buf = &c;

        while (inb(stuffp->rreg_status) & MCDX_RBIT_STEN) {
                if (time_after(jiffies, timeout))
                        return -1;
                mcdx_delay(stuffp, delay);
        }

        *buf = (unsigned char) inb(stuffp->rreg_data) & 0xff;

        return 0;
}

static int mcdx_setattentuator(struct s_drive_stuff *stuffp,
                    struct cdrom_volctrl *vol, int tries)
{
        char cmd[5];
        cmd[0] = 0xae;
        cmd[1] = vol->channel0;
        cmd[2] = 0;
        cmd[3] = vol->channel1;
        cmd[4] = 0;

        return mcdx_talk(stuffp, cmd, sizeof(cmd), NULL, 5, 200, tries);
}

MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(MITSUMI_X_CDROM_MAJOR);