drivers/cdrom/viocd.c

   1 /* -*- linux-c -*-
   2  *  drivers/cdrom/viocd.c
   3  *
   4  *  iSeries Virtual CD Rom
   5  *
   6  *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7  *           Ryan Arnold <ryanarn@us.ibm.com>
   8  *           Colin Devilbiss <devilbis@us.ibm.com>
   9  *           Stephen Rothwell
  10  *
  11  * (C) Copyright 2000-2004 IBM Corporation
  12  *
  13  * This program is free software;  you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of the
  16  * License, or (at your option) anyu later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * This routine provides access to CD ROM drives owned and managed by an
  28  * OS/400 partition running on the same box as this Linux partition.
  29  *
  30  * All operations are performed by sending messages back and forth to
  31  * the OS/400 partition.
  32  */
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/major.h>
  37 #include <linux/blkdev.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/errno.h>
  40 #include <linux/init.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/module.h>
  43 #include <linux/completion.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/mutex.h>
  46 #include <linux/seq_file.h>
  47 #include <linux/scatterlist.h>
  48
  49 #include <asm/vio.h>
  50 #include <asm/iseries/hv_types.h>
  51 #include <asm/iseries/hv_lp_event.h>
  52 #include <asm/iseries/vio.h>
  53 #include <asm/firmware.h>
  54
  55 #define VIOCD_DEVICE                    "iseries/vcd"
  56
  57 #define VIOCD_VERS "1.06"
  58
  59 /*
  60  * Should probably make this a module parameter....sigh
  61  */
  62 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  63
  64 static DEFINE_MUTEX(viocd_mutex);
  65 static const struct vio_error_entry viocd_err_table[] = {
  66         {0x0201, EINVAL, "Invalid Range"},
  67         {0x0202, EINVAL, "Invalid Token"},
  68         {0x0203, EIO, "DMA Error"},
  69         {0x0204, EIO, "Use Error"},
  70         {0x0205, EIO, "Release Error"},
  71         {0x0206, EINVAL, "Invalid CD"},
  72         {0x020C, EROFS, "Read Only Device"},
  73         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  74         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  75         {0x02FF, EIO, "Internal Error"},
  76         {0x3010, EIO, "Changed Volume"},
  77         {0xC100, EIO, "Optical System Error"},
  78         {0x0000, 0, NULL},
  79 };
  80
  81 /*
  82  * This is the structure we use to exchange info between driver and interrupt
  83  * handler
  84  */
  85 struct viocd_waitevent {
  86         struct completion       com;
  87         int                     rc;
  88         u16                     sub_result;
  89         int                     changed;
  90 };
  91
  92 /* this is a lookup table for the true capabilities of a device */
  93 struct capability_entry {
  94         char    *type;
  95         int     capability;
  96 };
  97
  98 static struct capability_entry capability_table[] __initdata = {
  99         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 100         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 101         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 102         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 103         { "6321", CDC_LOCK },
 104         { "632B", 0 },
 105         { NULL  , CDC_LOCK },
 106 };
 107
 108 /* These are our internal structures for keeping track of devices */
 109 static int viocd_numdev;
 110
 111 struct disk_info {
 112         struct gendisk                  *viocd_disk;
 113         struct cdrom_device_info        viocd_info;
 114         struct device                   *dev;
 115         const char                      *rsrcname;
 116         const char                      *type;
 117         const char                      *model;
 118 };
 119 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 120
 121 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 122
 123 static spinlock_t viocd_reqlock;
 124
 125 #define MAX_CD_REQ      1
 126
 127 /* procfs support */
 128 static int proc_viocd_show(struct seq_file *m, void *v)
 129 {
 130         int i;
 131
 132         for (i = 0; i < viocd_numdev; i++) {
 133                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 134                                 "type %4.4s, model %3.3s\n",
 135                                 i, viocd_diskinfo[i].rsrcname,
 136                                 viocd_diskinfo[i].type,
 137                                 viocd_diskinfo[i].model);
 138         }
 139         return 0;
 140 }
 141
 142 static int proc_viocd_open(struct inode *inode, struct file *file)
 143 {
 144         return single_open(file, proc_viocd_show, NULL);
 145 }
 146
 147 static const struct file_operations proc_viocd_operations = {
 148         .owner          = THIS_MODULE,
 149         .open           = proc_viocd_open,
 150         .read           = seq_read,
 151         .llseek         = seq_lseek,
 152         .release        = single_release,
 153 };
 154
 155 static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 156 {
 157         struct disk_info *di = bdev->bd_disk->private_data;
 158         int ret;
 159
 160         mutex_lock(&viocd_mutex);
 161         ret = cdrom_open(&di->viocd_info, bdev, mode);
 162         mutex_unlock(&viocd_mutex);
 163
 164         return ret;
 165 }
 166
 167 static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 168 {
 169         struct disk_info *di = disk->private_data;
 170         mutex_lock(&viocd_mutex);
 171         cdrom_release(&di->viocd_info, mode);
 172         mutex_unlock(&viocd_mutex);
 173         return 0;
 174 }
 175
 176 static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
 177                 unsigned cmd, unsigned long arg)
 178 {
 179         struct disk_info *di = bdev->bd_disk->private_data;
 180         int ret;
 181
 182         mutex_lock(&viocd_mutex);
 183         ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
 184         mutex_unlock(&viocd_mutex);
 185
 186         return ret;
 187 }
 188
 189 static int viocd_blk_media_changed(struct gendisk *disk)
 190 {
 191         struct disk_info *di = disk->private_data;
 192         return cdrom_media_changed(&di->viocd_info);
 193 }
 194
 195 static const struct block_device_operations viocd_fops = {
 196         .owner =                THIS_MODULE,
 197         .open =                 viocd_blk_open,
 198         .release =              viocd_blk_release,
 199         .ioctl =                viocd_blk_ioctl,
 200         .media_changed =        viocd_blk_media_changed,
 201 };
 202
 203 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 204 {
 205         struct disk_info *diskinfo = cdi->handle;
 206         int device_no = DEVICE_NR(diskinfo);
 207         HvLpEvent_Rc hvrc;
 208         struct viocd_waitevent we;
 209
 210         init_completion(&we.com);
 211         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 212                         HvLpEvent_Type_VirtualIo,
 213                         viomajorsubtype_cdio | viocdopen,
 214                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 215                         viopath_sourceinst(viopath_hostLp),
 216                         viopath_targetinst(viopath_hostLp),
 217                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 218                         0, 0, 0);
 219         if (hvrc != 0) {
 220                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 221                            (int)hvrc);
 222                 return -EIO;
 223         }
 224
 225         wait_for_completion(&we.com);
 226
 227         if (we.rc) {
 228                 const struct vio_error_entry *err =
 229                         vio_lookup_rc(viocd_err_table, we.sub_result);
 230                 pr_warning("bad rc %d:0x%04X on open: %s\n",
 231                            we.rc, we.sub_result, err->msg);
 232                 return -err->errno;
 233         }
 234
 235         return 0;
 236 }
 237
 238 static void viocd_release(struct cdrom_device_info *cdi)
 239 {
 240         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 241         HvLpEvent_Rc hvrc;
 242
 243         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 244                         HvLpEvent_Type_VirtualIo,
 245                         viomajorsubtype_cdio | viocdclose,
 246                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 247                         viopath_sourceinst(viopath_hostLp),
 248                         viopath_targetinst(viopath_hostLp), 0,
 249                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 250         if (hvrc != 0)
 251                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 252                            (int)hvrc);
 253 }
 254
 255 /* Send a read or write request to OS/400 */
 256 static int send_request(struct request *req)
 257 {
 258         HvLpEvent_Rc hvrc;
 259         struct disk_info *diskinfo = req->rq_disk->private_data;
 260         u64 len;
 261         dma_addr_t dmaaddr;
 262         int direction;
 263         u16 cmd;
 264         struct scatterlist sg;
 265
 266         BUG_ON(req->nr_phys_segments > 1);
 267
 268         if (rq_data_dir(req) == READ) {
 269                 direction = DMA_FROM_DEVICE;
 270                 cmd = viomajorsubtype_cdio | viocdread;
 271         } else {
 272                 direction = DMA_TO_DEVICE;
 273                 cmd = viomajorsubtype_cdio | viocdwrite;
 274         }
 275
 276         sg_init_table(&sg, 1);
 277         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 278                 pr_warning("error setting up scatter/gather list\n");
 279                 return -1;
 280         }
 281
 282         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 283                 pr_warning("error allocating sg tce\n");
 284                 return -1;
 285         }
 286         dmaaddr = sg_dma_address(&sg);
 287         len = sg_dma_len(&sg);
 288
 289         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 290                         HvLpEvent_Type_VirtualIo, cmd,
 291                         HvLpEvent_AckInd_DoAck,
 292                         HvLpEvent_AckType_ImmediateAck,
 293                         viopath_sourceinst(viopath_hostLp),
 294                         viopath_targetinst(viopath_hostLp),
 295                         (u64)req, VIOVERSION << 16,
 296                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 297                         (u64)blk_rq_pos(req) * 512, len, 0);
 298         if (hvrc != HvLpEvent_Rc_Good) {
 299                 pr_warning("hv error on op %d\n", (int)hvrc);
 300                 return -1;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int rwreq;
 307
 308 static void do_viocd_request(struct request_queue *q)
 309 {
 310         struct request *req;
 311
 312         while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
 313                 if (req->cmd_type != REQ_TYPE_FS)
 314                         __blk_end_request_all(req, -EIO);
 315                 else if (send_request(req) < 0) {
 316                         pr_warning("unable to send message to OS/400!\n");
 317                         __blk_end_request_all(req, -EIO);
 318                 } else
 319                         rwreq++;
 320         }
 321 }
 322
 323 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 324 {
 325         struct viocd_waitevent we;
 326         HvLpEvent_Rc hvrc;
 327         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 328
 329         init_completion(&we.com);
 330
 331         /* Send the open event to OS/400 */
 332         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 333                         HvLpEvent_Type_VirtualIo,
 334                         viomajorsubtype_cdio | viocdcheck,
 335                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 336                         viopath_sourceinst(viopath_hostLp),
 337                         viopath_targetinst(viopath_hostLp),
 338                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 339                         0, 0, 0);
 340         if (hvrc != 0) {
 341                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 342                            (int)hvrc);
 343                 return -EIO;
 344         }
 345
 346         wait_for_completion(&we.com);
 347
 348         /* Check the return code.  If bad, assume no change */
 349         if (we.rc) {
 350                 const struct vio_error_entry *err =
 351                         vio_lookup_rc(viocd_err_table, we.sub_result);
 352                 pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 353                            we.rc, we.sub_result, err->msg);
 354                 return 0;
 355         }
 356
 357         return we.changed;
 358 }
 359
 360 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 361 {
 362         HvLpEvent_Rc hvrc;
 363         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 364         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 365         u64 flags = !!locking;
 366         struct viocd_waitevent we;
 367
 368         init_completion(&we.com);
 369
 370         /* Send the lockdoor event to OS/400 */
 371         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 372                         HvLpEvent_Type_VirtualIo,
 373                         viomajorsubtype_cdio | viocdlockdoor,
 374                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 375                         viopath_sourceinst(viopath_hostLp),
 376                         viopath_targetinst(viopath_hostLp),
 377                         (u64)&we, VIOVERSION << 16,
 378                         (device_no << 48) | (flags << 32), 0, 0, 0);
 379         if (hvrc != 0) {
 380                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 381                            (int)hvrc);
 382                 return -EIO;
 383         }
 384
 385         wait_for_completion(&we.com);
 386
 387         if (we.rc != 0)
 388                 return -EIO;
 389         return 0;
 390 }
 391
 392 static int viocd_packet(struct cdrom_device_info *cdi,
 393                 struct packet_command *cgc)
 394 {
 395         unsigned int buflen = cgc->buflen;
 396         int ret = -EIO;
 397
 398         switch (cgc->cmd[0]) {
 399         case GPCMD_READ_DISC_INFO:
 400                 {
 401                         disc_information *di = (disc_information *)cgc->buffer;
 402
 403                         if (buflen >= 2) {
 404                                 di->disc_information_length = cpu_to_be16(1);
 405                                 ret = 0;
 406                         }
 407                         if (buflen >= 3)
 408                                 di->erasable =
 409                                         (cdi->ops->capability & ~cdi->mask
 410                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 411                 }
 412                 break;
 413         case GPCMD_GET_CONFIGURATION:
 414                 if (cgc->cmd[3] == CDF_RWRT) {
 415                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 416
 417                         if ((buflen >=
 418                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 419                             (cdi->ops->capability & ~cdi->mask
 420                              & (CDC_DVD_RAM | CDC_RAM))) {
 421                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 422                                 rfd->curr = 1;
 423                                 ret = 0;
 424                         }
 425                 }
 426                 break;
 427         default:
 428                 if (cgc->sense) {
 429                         /* indicate Unknown code */
 430                         cgc->sense->sense_key = 0x05;
 431                         cgc->sense->asc = 0x20;
 432                         cgc->sense->ascq = 0x00;
 433                 }
 434                 break;
 435         }
 436
 437         cgc->stat = ret;
 438         return ret;
 439 }
 440
 441 static void restart_all_queues(int first_index)
 442 {
 443         int i;
 444
 445         for (i = first_index + 1; i < viocd_numdev; i++)
 446                 if (viocd_diskinfo[i].viocd_disk)
 447                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 448         for (i = 0; i <= first_index; i++)
 449                 if (viocd_diskinfo[i].viocd_disk)
 450                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 451 }
 452
 453 /* This routine handles incoming CD LP events */
 454 static void vio_handle_cd_event(struct HvLpEvent *event)
 455 {
 456         struct viocdlpevent *bevent;
 457         struct viocd_waitevent *pwe;
 458         struct disk_info *di;
 459         unsigned long flags;
 460         struct request *req;
 461
 462
 463         if (event == NULL)
 464                 /* Notification that a partition went away! */
 465                 return;
 466         /* First, we should NEVER get an int here...only acks */
 467         if (hvlpevent_is_int(event)) {
 468                 pr_warning("Yikes! got an int in viocd event handler!\n");
 469                 if (hvlpevent_need_ack(event)) {
 470                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 471                         HvCallEvent_ackLpEvent(event);
 472                 }
 473         }
 474
 475         bevent = (struct viocdlpevent *)event;
 476
 477         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 478         case viocdopen:
 479                 if (event->xRc == 0) {
 480                         di = &viocd_diskinfo[bevent->disk];
 481                         blk_queue_logical_block_size(di->viocd_disk->queue,
 482                                                      bevent->block_size);
 483                         set_capacity(di->viocd_disk,
 484                                         bevent->media_size *
 485                                         bevent->block_size / 512);
 486                 }
 487                 /* FALLTHROUGH !! */
 488         case viocdlockdoor:
 489                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 490 return_complete:
 491                 pwe->rc = event->xRc;
 492                 pwe->sub_result = bevent->sub_result;
 493                 complete(&pwe->com);
 494                 break;
 495
 496         case viocdcheck:
 497                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 498                 pwe->changed = bevent->flags;
 499                 goto return_complete;
 500
 501         case viocdclose:
 502                 break;
 503
 504         case viocdwrite:
 505         case viocdread:
 506                 /*
 507                  * Since this is running in interrupt mode, we need to
 508                  * make sure we're not stepping on any global I/O operations
 509                  */
 510                 di = &viocd_diskinfo[bevent->disk];
 511                 spin_lock_irqsave(&viocd_reqlock, flags);
 512                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 513                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 514                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 515                 req = (struct request *)bevent->event.xCorrelationToken;
 516                 rwreq--;
 517
 518                 if (event->xRc != HvLpEvent_Rc_Good) {
 519                         const struct vio_error_entry *err =
 520                                 vio_lookup_rc(viocd_err_table,
 521                                                 bevent->sub_result);
 522                         pr_warning("request %p failed with rc %d:0x%04X: %s\n",
 523                                    req, event->xRc,
 524                                    bevent->sub_result, err->msg);
 525                         __blk_end_request_all(req, -EIO);
 526                 } else
 527                         __blk_end_request_all(req, 0);
 528
 529                 /* restart handling of incoming requests */
 530                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 531                 restart_all_queues(bevent->disk);
 532                 break;
 533
 534         default:
 535                 pr_warning("message with invalid subtype %0x04X!\n",
 536                            event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 537                 if (hvlpevent_need_ack(event)) {
 538                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 539                         HvCallEvent_ackLpEvent(event);
 540                 }
 541         }
 542 }
 543
 544 static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 545                              void *arg)
 546 {
 547         return -EINVAL;
 548 }
 549
 550 static struct cdrom_device_ops viocd_dops = {
 551         .open = viocd_open,
 552         .release = viocd_release,
 553         .media_changed = viocd_media_changed,
 554         .lock_door = viocd_lock_door,
 555         .generic_packet = viocd_packet,
 556         .audio_ioctl = viocd_audio_ioctl,
 557         .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
 558 };
 559
 560 static int find_capability(const char *type)
 561 {
 562         struct capability_entry *entry;
 563
 564         for(entry = capability_table; entry->type; ++entry)
 565                 if(!strncmp(entry->type, type, 4))
 566                         break;
 567         return entry->capability;
 568 }
 569
 570 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 571 {
 572         struct gendisk *gendisk;
 573         int deviceno;
 574         struct disk_info *d;
 575         struct cdrom_device_info *c;
 576         struct request_queue *q;
 577         struct device_node *node = vdev->dev.of_node;
 578
 579         deviceno = vdev->unit_address;
 580         if (deviceno >= VIOCD_MAX_CD)
 581                 return -ENODEV;
 582         if (!node)
 583                 return -ENODEV;
 584
 585         if (deviceno >= viocd_numdev)
 586                 viocd_numdev = deviceno + 1;
 587
 588         d = &viocd_diskinfo[deviceno];
 589         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 590         d->type = of_get_property(node, "linux,vio_type", NULL);
 591         d->model = of_get_property(node, "linux,vio_model", NULL);
 592
 593         c = &d->viocd_info;
 594
 595         c->ops = &viocd_dops;
 596         c->speed = 4;
 597         c->capacity = 1;
 598         c->handle = d;
 599         c->mask = ~find_capability(d->type);
 600         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 601
 602         if (register_cdrom(c) != 0) {
 603                 pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
 604                 goto out;
 605         }
 606         pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
 607                 c->name, d->rsrcname, d->type, d->model);
 608         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 609         if (q == NULL) {
 610                 pr_warning("Cannot allocate queue for %s!\n", c->name);
 611                 goto out_unregister_cdrom;
 612         }
 613         gendisk = alloc_disk(1);
 614         if (gendisk == NULL) {
 615                 pr_warning("Cannot create gendisk for %s!\n", c->name);
 616                 goto out_cleanup_queue;
 617         }
 618         gendisk->major = VIOCD_MAJOR;
 619         gendisk->first_minor = deviceno;
 620         strncpy(gendisk->disk_name, c->name,
 621                         sizeof(gendisk->disk_name));
 622         blk_queue_max_segments(q, 1);
 623         blk_queue_max_hw_sectors(q, 4096 / 512);
 624         gendisk->queue = q;
 625         gendisk->fops = &viocd_fops;
 626         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 627         set_capacity(gendisk, 0);
 628         gendisk->private_data = d;
 629         d->viocd_disk = gendisk;
 630         d->dev = &vdev->dev;
 631         gendisk->driverfs_dev = d->dev;
 632         add_disk(gendisk);
 633         return 0;
 634
 635 out_cleanup_queue:
 636         blk_cleanup_queue(q);
 637 out_unregister_cdrom:
 638         unregister_cdrom(c);
 639 out:
 640         return -ENODEV;
 641 }
 642
 643 static int viocd_remove(struct vio_dev *vdev)
 644 {
 645         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 646
 647         unregister_cdrom(&d->viocd_info);
 648         del_gendisk(d->viocd_disk);
 649         blk_cleanup_queue(d->viocd_disk->queue);
 650         put_disk(d->viocd_disk);
 651         return 0;
 652 }
 653
 654 /**
 655  * viocd_device_table: Used by vio.c to match devices that we
 656  * support.
 657  */
 658 static struct vio_device_id viocd_device_table[] __devinitdata = {
 659         { "block", "IBM,iSeries-viocd" },
 660         { "", "" }
 661 };
 662 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 663
 664 static struct vio_driver viocd_driver = {
 665         .id_table = viocd_device_table,
 666         .probe = viocd_probe,
 667         .remove = viocd_remove,
 668         .driver = {
 669                 .name = "viocd",
 670                 .owner = THIS_MODULE,
 671         }
 672 };
 673
 674 static int __init viocd_init(void)
 675 {
 676         int ret = 0;
 677
 678         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 679                 return -ENODEV;
 680
 681         if (viopath_hostLp == HvLpIndexInvalid) {
 682                 vio_set_hostlp();
 683                 /* If we don't have a host, bail out */
 684                 if (viopath_hostLp == HvLpIndexInvalid)
 685                         return -ENODEV;
 686         }
 687
 688         pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
 689
 690         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 691                 pr_warning("Unable to get major %d for %s\n",
 692                            VIOCD_MAJOR, VIOCD_DEVICE);
 693                 return -EIO;
 694         }
 695
 696         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 697                         MAX_CD_REQ + 2);
 698         if (ret) {
 699                 pr_warning("error opening path to host partition %d\n",
 700                            viopath_hostLp);
 701                 goto out_unregister;
 702         }
 703
 704         /* Initialize our request handler */
 705         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 706
 707         spin_lock_init(&viocd_reqlock);
 708
 709         ret = vio_register_driver(&viocd_driver);
 710         if (ret)
 711                 goto out_free_info;
 712
 713         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
 714                     &proc_viocd_operations);
 715         return 0;
 716
 717 out_free_info:
 718         vio_clearHandler(viomajorsubtype_cdio);
 719         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 720 out_unregister:
 721         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 722         return ret;
 723 }
 724
 725 static void __exit viocd_exit(void)
 726 {
 727         remove_proc_entry("iSeries/viocd", NULL);
 728         vio_unregister_driver(&viocd_driver);
 729         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 730         vio_clearHandler(viomajorsubtype_cdio);
 731         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 732 }
 733
 734 module_init(viocd_init);
 735 module_exit(viocd_exit);
 736 MODULE_LICENSE("GPL");