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