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viocd.c

/* -*- linux-c -*-
 *  drivers/cdrom/viocd.c
 *
 *  iSeries Virtual CD Rom
 *
 *  Authors: Dave Boutcher <boutcher@us.ibm.com>
 *           Ryan Arnold <ryanarn@us.ibm.com>
 *           Colin Devilbiss <devilbis@us.ibm.com>
 *           Stephen Rothwell <sfr@au1.ibm.com>
 *
 * (C) Copyright 2000-2004 IBM Corporation
 *
 * 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 of the
 * License, or (at your option) anyu 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; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * This routine provides access to CD ROM drives owned and managed by an
 * OS/400 partition running on the same box as this Linux partition.
 *
 * All operations are performed by sending messages back and forth to
 * the OS/400 partition.
 */

#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/scatterlist.h>

#include <asm/vio.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/vio.h>
#include <asm/firmware.h>

#define VIOCD_DEVICE                "iseries/vcd"

#define VIOCD_VERS "1.06"

#define VIOCD_KERN_WARNING          KERN_WARNING "viocd: "
#define VIOCD_KERN_INFO             KERN_INFO "viocd: "

/*
 * Should probably make this a module parameter....sigh
 */
#define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS

static const struct vio_error_entry viocd_err_table[] = {
      {0x0201, EINVAL, "Invalid Range"},
      {0x0202, EINVAL, "Invalid Token"},
      {0x0203, EIO, "DMA Error"},
      {0x0204, EIO, "Use Error"},
      {0x0205, EIO, "Release Error"},
      {0x0206, EINVAL, "Invalid CD"},
      {0x020C, EROFS, "Read Only Device"},
      {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
      {0x020E, EIO, "Optical System Error (Varied Off?)"},
      {0x02FF, EIO, "Internal Error"},
      {0x3010, EIO, "Changed Volume"},
      {0xC100, EIO, "Optical System Error"},
      {0x0000, 0, NULL},
};

/*
 * This is the structure we use to exchange info between driver and interrupt
 * handler
 */
struct viocd_waitevent {
      struct completion com;
      int               rc;
      u16               sub_result;
      int               changed;
};

/* this is a lookup table for the true capabilities of a device */
struct capability_entry {
      char  *type;
      int   capability;
};

static struct capability_entry capability_table[] __initdata = {
      { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
      { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
      { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
      { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
      { "6321", CDC_LOCK },
      { "632B", 0 },
      { NULL  , CDC_LOCK },
};

/* These are our internal structures for keeping track of devices */
static int viocd_numdev;

struct disk_info {
      struct gendisk                *viocd_disk;
      struct cdrom_device_info      viocd_info;
      struct device                 *dev;
      const char              *rsrcname;
      const char              *type;
      const char              *model;
};
static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];

#define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])

static spinlock_t viocd_reqlock;

#define MAX_CD_REQ      1

/* procfs support */
static int proc_viocd_show(struct seq_file *m, void *v)
{
      int i;

      for (i = 0; i < viocd_numdev; i++) {
            seq_printf(m, "viocd device %d is iSeries resource %10.10s"
                        "type %4.4s, model %3.3s\n",
                        i, viocd_diskinfo[i].rsrcname,
                        viocd_diskinfo[i].type,
                        viocd_diskinfo[i].model);
      }
      return 0;
}

static int proc_viocd_open(struct inode *inode, struct file *file)
{
      return single_open(file, proc_viocd_show, NULL);
}

static const struct file_operations proc_viocd_operations = {
      .open       = proc_viocd_open,
      .read       = seq_read,
      .llseek           = seq_lseek,
      .release    = single_release,
};

static int viocd_blk_open(struct inode *inode, struct file *file)
{
      struct disk_info *di = inode->i_bdev->bd_disk->private_data;
      return cdrom_open(&di->viocd_info, inode, file);
}

static int viocd_blk_release(struct inode *inode, struct file *file)
{
      struct disk_info *di = inode->i_bdev->bd_disk->private_data;
      return cdrom_release(&di->viocd_info, file);
}

static int viocd_blk_ioctl(struct inode *inode, struct file *file,
            unsigned cmd, unsigned long arg)
{
      struct disk_info *di = inode->i_bdev->bd_disk->private_data;
      return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
}

static int viocd_blk_media_changed(struct gendisk *disk)
{
      struct disk_info *di = disk->private_data;
      return cdrom_media_changed(&di->viocd_info);
}

struct block_device_operations viocd_fops = {
      .owner =          THIS_MODULE,
      .open =                 viocd_blk_open,
      .release =        viocd_blk_release,
      .ioctl =          viocd_blk_ioctl,
      .media_changed =  viocd_blk_media_changed,
};

static int viocd_open(struct cdrom_device_info *cdi, int purpose)
{
        struct disk_info *diskinfo = cdi->handle;
      int device_no = DEVICE_NR(diskinfo);
      HvLpEvent_Rc hvrc;
      struct viocd_waitevent we;

      init_completion(&we.com);
      hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                  HvLpEvent_Type_VirtualIo,
                  viomajorsubtype_cdio | viocdopen,
                  HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
                  viopath_sourceinst(viopath_hostLp),
                  viopath_targetinst(viopath_hostLp),
                  (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
                  0, 0, 0);
      if (hvrc != 0) {
            printk(VIOCD_KERN_WARNING
                        "bad rc on HvCallEvent_signalLpEventFast %d\n",
                        (int)hvrc);
            return -EIO;
      }

      wait_for_completion(&we.com);

      if (we.rc) {
            const struct vio_error_entry *err =
                  vio_lookup_rc(viocd_err_table, we.sub_result);
            printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
                        we.rc, we.sub_result, err->msg);
            return -err->errno;
      }

      return 0;
}

static void viocd_release(struct cdrom_device_info *cdi)
{
      int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
      HvLpEvent_Rc hvrc;

      hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                  HvLpEvent_Type_VirtualIo,
                  viomajorsubtype_cdio | viocdclose,
                  HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
                  viopath_sourceinst(viopath_hostLp),
                  viopath_targetinst(viopath_hostLp), 0,
                  VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
      if (hvrc != 0)
            printk(VIOCD_KERN_WARNING
                        "bad rc on HvCallEvent_signalLpEventFast %d\n",
                        (int)hvrc);
}

/* Send a read or write request to OS/400 */
static int send_request(struct request *req)
{
      HvLpEvent_Rc hvrc;
      struct disk_info *diskinfo = req->rq_disk->private_data;
      u64 len;
      dma_addr_t dmaaddr;
      int direction;
      u16 cmd;
      struct scatterlist sg;

      BUG_ON(req->nr_phys_segments > 1);

      if (rq_data_dir(req) == READ) {
            direction = DMA_FROM_DEVICE;
            cmd = viomajorsubtype_cdio | viocdread;
      } else {
            direction = DMA_TO_DEVICE;
            cmd = viomajorsubtype_cdio | viocdwrite;
      }

      sg_init_table(&sg, 1);
        if (blk_rq_map_sg(req->q, req, &sg) == 0) {
            printk(VIOCD_KERN_WARNING
                        "error setting up scatter/gather list\n");
            return -1;
      }

      if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
            printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
            return -1;
      }
      dmaaddr = sg_dma_address(&sg);
      len = sg_dma_len(&sg);

      hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                  HvLpEvent_Type_VirtualIo, cmd,
                  HvLpEvent_AckInd_DoAck,
                  HvLpEvent_AckType_ImmediateAck,
                  viopath_sourceinst(viopath_hostLp),
                  viopath_targetinst(viopath_hostLp),
                  (u64)req, VIOVERSION << 16,
                  ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
                  (u64)req->sector * 512, len, 0);
      if (hvrc != HvLpEvent_Rc_Good) {
            printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
            return -1;
      }

      return 0;
}

static void viocd_end_request(struct request *req, int uptodate)
{
      int nsectors = req->hard_nr_sectors;

      /*
       * Make sure it's fully ended, and ensure that we process
       * at least one sector.
       */
      if (blk_pc_request(req))
            nsectors = (req->data_len + 511) >> 9;
      if (!nsectors)
            nsectors = 1;

      if (end_that_request_first(req, uptodate, nsectors))
            BUG();
      add_disk_randomness(req->rq_disk);
      blkdev_dequeue_request(req);
      end_that_request_last(req, uptodate);
}

static int rwreq;

static void do_viocd_request(struct request_queue *q)
{
      struct request *req;

      while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
            if (!blk_fs_request(req))
                  viocd_end_request(req, 0);
            else if (send_request(req) < 0) {
                  printk(VIOCD_KERN_WARNING
                              "unable to send message to OS/400!");
                  viocd_end_request(req, 0);
            } else
                  rwreq++;
      }
}

static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
{
      struct viocd_waitevent we;
      HvLpEvent_Rc hvrc;
      int device_no = DEVICE_NR((struct disk_info *)cdi->handle);

      init_completion(&we.com);

      /* Send the open event to OS/400 */
      hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                  HvLpEvent_Type_VirtualIo,
                  viomajorsubtype_cdio | viocdcheck,
                  HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
                  viopath_sourceinst(viopath_hostLp),
                  viopath_targetinst(viopath_hostLp),
                  (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
                  0, 0, 0);
      if (hvrc != 0) {
            printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
                        (int)hvrc);
            return -EIO;
      }

      wait_for_completion(&we.com);

      /* Check the return code.  If bad, assume no change */
      if (we.rc) {
            const struct vio_error_entry *err =
                  vio_lookup_rc(viocd_err_table, we.sub_result);
            printk(VIOCD_KERN_WARNING
                        "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
                        we.rc, we.sub_result, err->msg);
            return 0;
      }

      return we.changed;
}

static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
{
      HvLpEvent_Rc hvrc;
      u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
      /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
      u64 flags = !!locking;
      struct viocd_waitevent we;

      init_completion(&we.com);

      /* Send the lockdoor event to OS/400 */
      hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                  HvLpEvent_Type_VirtualIo,
                  viomajorsubtype_cdio | viocdlockdoor,
                  HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
                  viopath_sourceinst(viopath_hostLp),
                  viopath_targetinst(viopath_hostLp),
                  (u64)&we, VIOVERSION << 16,
                  (device_no << 48) | (flags << 32), 0, 0, 0);
      if (hvrc != 0) {
            printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
                        (int)hvrc);
            return -EIO;
      }

      wait_for_completion(&we.com);

      if (we.rc != 0)
            return -EIO;
      return 0;
}

static int viocd_packet(struct cdrom_device_info *cdi,
            struct packet_command *cgc)
{
      unsigned int buflen = cgc->buflen;
      int ret = -EIO;

      switch (cgc->cmd[0]) {
      case GPCMD_READ_DISC_INFO:
            {
                  disc_information *di = (disc_information *)cgc->buffer;

                  if (buflen >= 2) {
                        di->disc_information_length = cpu_to_be16(1);
                        ret = 0;
                  }
                  if (buflen >= 3)
                        di->erasable =
                              (cdi->ops->capability & ~cdi->mask
                               & (CDC_DVD_RAM | CDC_RAM)) != 0;
            }
            break;
      case GPCMD_GET_CONFIGURATION:
            if (cgc->cmd[3] == CDF_RWRT) {
                  struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));

                  if ((buflen >=
                       (sizeof(struct feature_header) + sizeof(*rfd))) &&
                      (cdi->ops->capability & ~cdi->mask
                       & (CDC_DVD_RAM | CDC_RAM))) {
                        rfd->feature_code = cpu_to_be16(CDF_RWRT);
                        rfd->curr = 1;
                        ret = 0;
                  }
            }
            break;
      default:
            if (cgc->sense) {
                  /* indicate Unknown code */
                  cgc->sense->sense_key = 0x05;
                  cgc->sense->asc = 0x20;
                  cgc->sense->ascq = 0x00;
            }
            break;
      }

      cgc->stat = ret;
      return ret;
}

static void restart_all_queues(int first_index)
{
      int i;

      for (i = first_index + 1; i < viocd_numdev; i++)
            if (viocd_diskinfo[i].viocd_disk)
                  blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
      for (i = 0; i <= first_index; i++)
            if (viocd_diskinfo[i].viocd_disk)
                  blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
}

/* This routine handles incoming CD LP events */
static void vio_handle_cd_event(struct HvLpEvent *event)
{
      struct viocdlpevent *bevent;
      struct viocd_waitevent *pwe;
      struct disk_info *di;
      unsigned long flags;
      struct request *req;


      if (event == NULL)
            /* Notification that a partition went away! */
            return;
      /* First, we should NEVER get an int here...only acks */
      if (hvlpevent_is_int(event)) {
            printk(VIOCD_KERN_WARNING
                        "Yikes! got an int in viocd event handler!\n");
            if (hvlpevent_need_ack(event)) {
                  event->xRc = HvLpEvent_Rc_InvalidSubtype;
                  HvCallEvent_ackLpEvent(event);
            }
      }

      bevent = (struct viocdlpevent *)event;

      switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
      case viocdopen:
            if (event->xRc == 0) {
                  di = &viocd_diskinfo[bevent->disk];
                  blk_queue_hardsect_size(di->viocd_disk->queue,
                              bevent->block_size);
                  set_capacity(di->viocd_disk,
                              bevent->media_size *
                              bevent->block_size / 512);
            }
            /* FALLTHROUGH !! */
      case viocdlockdoor:
            pwe = (struct viocd_waitevent *)event->xCorrelationToken;
return_complete:
            pwe->rc = event->xRc;
            pwe->sub_result = bevent->sub_result;
            complete(&pwe->com);
            break;

      case viocdcheck:
            pwe = (struct viocd_waitevent *)event->xCorrelationToken;
            pwe->changed = bevent->flags;
            goto return_complete;

      case viocdclose:
            break;

      case viocdwrite:
      case viocdread:
            /*
             * Since this is running in interrupt mode, we need to
             * make sure we're not stepping on any global I/O operations
             */
            di = &viocd_diskinfo[bevent->disk];
            spin_lock_irqsave(&viocd_reqlock, flags);
            dma_unmap_single(di->dev, bevent->token, bevent->len,
                        ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
                        ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
            req = (struct request *)bevent->event.xCorrelationToken;
            rwreq--;

            if (event->xRc != HvLpEvent_Rc_Good) {
                  const struct vio_error_entry *err =
                        vio_lookup_rc(viocd_err_table,
                                    bevent->sub_result);
                  printk(VIOCD_KERN_WARNING "request %p failed "
                              "with rc %d:0x%04X: %s\n",
                              req, event->xRc,
                              bevent->sub_result, err->msg);
                  viocd_end_request(req, 0);
            } else
                  viocd_end_request(req, 1);

            /* restart handling of incoming requests */
            spin_unlock_irqrestore(&viocd_reqlock, flags);
            restart_all_queues(bevent->disk);
            break;

      default:
            printk(VIOCD_KERN_WARNING
                        "message with invalid subtype %0x04X!\n",
                        event->xSubtype & VIOMINOR_SUBTYPE_MASK);
            if (hvlpevent_need_ack(event)) {
                  event->xRc = HvLpEvent_Rc_InvalidSubtype;
                  HvCallEvent_ackLpEvent(event);
            }
      }
}

static struct cdrom_device_ops viocd_dops = {
      .open = viocd_open,
      .release = viocd_release,
      .media_changed = viocd_media_changed,
      .lock_door = viocd_lock_door,
      .generic_packet = viocd_packet,
      .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
};

static int __init find_capability(const char *type)
{
      struct capability_entry *entry;

      for(entry = capability_table; entry->type; ++entry)
            if(!strncmp(entry->type, type, 4))
                  break;
      return entry->capability;
}

static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
      struct gendisk *gendisk;
      int deviceno;
      struct disk_info *d;
      struct cdrom_device_info *c;
      struct request_queue *q;
      struct device_node *node = vdev->dev.archdata.of_node;

      deviceno = vdev->unit_address;
      if (deviceno > VIOCD_MAX_CD)
            return -ENODEV;
      if (!node)
            return -ENODEV;

      if (deviceno >= viocd_numdev)
            viocd_numdev = deviceno + 1;

      d = &viocd_diskinfo[deviceno];
      d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
      d->type = of_get_property(node, "linux,vio_type", NULL);
      d->model = of_get_property(node, "linux,vio_model", NULL);

      c = &d->viocd_info;

      c->ops = &viocd_dops;
      c->speed = 4;
      c->capacity = 1;
      c->handle = d;
      c->mask = ~find_capability(d->type);
      sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);

      if (register_cdrom(c) != 0) {
            printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
                        c->name);
            goto out;
      }
      printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
                  "type %4.4s, model %3.3s\n",
                  c->name, d->rsrcname, d->type, d->model);
      q = blk_init_queue(do_viocd_request, &viocd_reqlock);
      if (q == NULL) {
            printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
                        c->name);
            goto out_unregister_cdrom;
      }
      gendisk = alloc_disk(1);
      if (gendisk == NULL) {
            printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
                        c->name);
            goto out_cleanup_queue;
      }
      gendisk->major = VIOCD_MAJOR;
      gendisk->first_minor = deviceno;
      strncpy(gendisk->disk_name, c->name,
                  sizeof(gendisk->disk_name));
      blk_queue_max_hw_segments(q, 1);
      blk_queue_max_phys_segments(q, 1);
      blk_queue_max_sectors(q, 4096 / 512);
      gendisk->queue = q;
      gendisk->fops = &viocd_fops;
      gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
      set_capacity(gendisk, 0);
      gendisk->private_data = d;
      d->viocd_disk = gendisk;
      d->dev = &vdev->dev;
      gendisk->driverfs_dev = d->dev;
      add_disk(gendisk);
      return 0;

out_cleanup_queue:
      blk_cleanup_queue(q);
out_unregister_cdrom:
      unregister_cdrom(c);
out:
      return -ENODEV;
}

static int viocd_remove(struct vio_dev *vdev)
{
      struct disk_info *d = &viocd_diskinfo[vdev->unit_address];

      if (unregister_cdrom(&d->viocd_info) != 0)
            printk(VIOCD_KERN_WARNING
                        "Cannot unregister viocd CD-ROM %s!\n",
                        d->viocd_info.name);
      del_gendisk(d->viocd_disk);
      blk_cleanup_queue(d->viocd_disk->queue);
      put_disk(d->viocd_disk);
      return 0;
}

/**
 * viocd_device_table: Used by vio.c to match devices that we
 * support.
 */
static struct vio_device_id viocd_device_table[] __devinitdata = {
      { "block", "IBM,iSeries-viocd" },
      { "", "" }
};
MODULE_DEVICE_TABLE(vio, viocd_device_table);

static struct vio_driver viocd_driver = {
      .id_table = viocd_device_table,
      .probe = viocd_probe,
      .remove = viocd_remove,
      .driver = {
            .name = "viocd",
            .owner = THIS_MODULE,
      }
};

static int __init viocd_init(void)
{
      struct proc_dir_entry *e;
      int ret = 0;

      if (!firmware_has_feature(FW_FEATURE_ISERIES))
            return -ENODEV;

      if (viopath_hostLp == HvLpIndexInvalid) {
            vio_set_hostlp();
            /* If we don't have a host, bail out */
            if (viopath_hostLp == HvLpIndexInvalid)
                  return -ENODEV;
      }

      printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
                  viopath_hostLp);

      if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
            printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
                        VIOCD_MAJOR, VIOCD_DEVICE);
            return -EIO;
      }

      ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
                  MAX_CD_REQ + 2);
      if (ret) {
            printk(VIOCD_KERN_WARNING
                        "error opening path to host partition %d\n",
                        viopath_hostLp);
            goto out_unregister;
      }

      /* Initialize our request handler */
      vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);

      spin_lock_init(&viocd_reqlock);

      ret = vio_register_driver(&viocd_driver);
      if (ret)
            goto out_free_info;

      e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
      if (e) {
            e->owner = THIS_MODULE;
            e->proc_fops = &proc_viocd_operations;
      }

      return 0;

out_free_info:
      vio_clearHandler(viomajorsubtype_cdio);
      viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
out_unregister:
      unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
      return ret;
}

static void __exit viocd_exit(void)
{
      remove_proc_entry("iSeries/viocd", NULL);
      vio_unregister_driver(&viocd_driver);
      viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
      vio_clearHandler(viomajorsubtype_cdio);
      unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
}

module_init(viocd_init);
module_exit(viocd_exit);
MODULE_LICENSE("GPL");

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