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 unsigned int viocd_blk_check_events(struct gendisk *disk,
 190                                            unsigned int clearing)
 191 {
 192         struct disk_info *di = disk->private_data;
 193         return cdrom_check_events(&di->viocd_info, clearing);
 194 }
 195
 196 static const struct block_device_operations viocd_fops = {
 197         .owner =                THIS_MODULE,
 198         .open =                 viocd_blk_open,
 199         .release =              viocd_blk_release,
 200         .ioctl =                viocd_blk_ioctl,
 201         .check_events =         viocd_blk_check_events,
 202 };
 203
 204 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 205 {
 206         struct disk_info *diskinfo = cdi->handle;
 207         int device_no = DEVICE_NR(diskinfo);
 208         HvLpEvent_Rc hvrc;
 209         struct viocd_waitevent we;
 210
 211         init_completion(&we.com);
 212         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 213                         HvLpEvent_Type_VirtualIo,
 214                         viomajorsubtype_cdio | viocdopen,
 215                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 216                         viopath_sourceinst(viopath_hostLp),
 217                         viopath_targetinst(viopath_hostLp),
 218                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 219                         0, 0, 0);
 220         if (hvrc != 0) {
 221                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 222                            (int)hvrc);
 223                 return -EIO;
 224         }
 225
 226         wait_for_completion(&we.com);
 227
 228         if (we.rc) {
 229                 const struct vio_error_entry *err =
 230                         vio_lookup_rc(viocd_err_table, we.sub_result);
 231                 pr_warning("bad rc %d:0x%04X on open: %s\n",
 232                            we.rc, we.sub_result, err->msg);
 233                 return -err->errno;
 234         }
 235
 236         return 0;
 237 }
 238
 239 static void viocd_release(struct cdrom_device_info *cdi)
 240 {
 241         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 242         HvLpEvent_Rc hvrc;
 243
 244         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 245                         HvLpEvent_Type_VirtualIo,
 246                         viomajorsubtype_cdio | viocdclose,
 247                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 248                         viopath_sourceinst(viopath_hostLp),
 249                         viopath_targetinst(viopath_hostLp), 0,
 250                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 251         if (hvrc != 0)
 252                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 253                            (int)hvrc);
 254 }
 255
 256 /* Send a read or write request to OS/400 */
 257 static int send_request(struct request *req)
 258 {
 259         HvLpEvent_Rc hvrc;
 260         struct disk_info *diskinfo = req->rq_disk->private_data;
 261         u64 len;
 262         dma_addr_t dmaaddr;
 263         int direction;
 264         u16 cmd;
 265         struct scatterlist sg;
 266
 267         BUG_ON(req->nr_phys_segments > 1);
 268
 269         if (rq_data_dir(req) == READ) {
 270                 direction = DMA_FROM_DEVICE;
 271                 cmd = viomajorsubtype_cdio | viocdread;
 272         } else {
 273                 direction = DMA_TO_DEVICE;
 274                 cmd = viomajorsubtype_cdio | viocdwrite;
 275         }
 276
 277         sg_init_table(&sg, 1);
 278         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 279                 pr_warning("error setting up scatter/gather list\n");
 280                 return -1;
 281         }
 282
 283         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 284                 pr_warning("error allocating sg tce\n");
 285                 return -1;
 286         }
 287         dmaaddr = sg_dma_address(&sg);
 288         len = sg_dma_len(&sg);
 289
 290         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 291                         HvLpEvent_Type_VirtualIo, cmd,
 292                         HvLpEvent_AckInd_DoAck,
 293                         HvLpEvent_AckType_ImmediateAck,
 294                         viopath_sourceinst(viopath_hostLp),
 295                         viopath_targetinst(viopath_hostLp),
 296                         (u64)req, VIOVERSION << 16,
 297                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 298                         (u64)blk_rq_pos(req) * 512, len, 0);
 299         if (hvrc != HvLpEvent_Rc_Good) {
 300                 pr_warning("hv error on op %d\n", (int)hvrc);
 301                 return -1;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static int rwreq;
 308
 309 static void do_viocd_request(struct request_queue *q)
 310 {
 311         struct request *req;
 312
 313         while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
 314                 if (req->cmd_type != REQ_TYPE_FS)
 315                         __blk_end_request_all(req, -EIO);
 316                 else if (send_request(req) < 0) {
 317                         pr_warning("unable to send message to OS/400!\n");
 318                         __blk_end_request_all(req, -EIO);
 319                 } else
 320                         rwreq++;
 321         }
 322 }
 323
 324 static unsigned int viocd_check_events(struct cdrom_device_info *cdi,
 325                                        unsigned int clearing, int disc_nr)
 326 {
 327         struct viocd_waitevent we;
 328         HvLpEvent_Rc hvrc;
 329         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 330
 331         init_completion(&we.com);
 332
 333         /* Send the open event to OS/400 */
 334         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 335                         HvLpEvent_Type_VirtualIo,
 336                         viomajorsubtype_cdio | viocdcheck,
 337                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 338                         viopath_sourceinst(viopath_hostLp),
 339                         viopath_targetinst(viopath_hostLp),
 340                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 341                         0, 0, 0);
 342         if (hvrc != 0) {
 343                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 344                            (int)hvrc);
 345                 return 0;
 346         }
 347
 348         wait_for_completion(&we.com);
 349
 350         /* Check the return code.  If bad, assume no change */
 351         if (we.rc) {
 352                 const struct vio_error_entry *err =
 353                         vio_lookup_rc(viocd_err_table, we.sub_result);
 354                 pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 355                            we.rc, we.sub_result, err->msg);
 356                 return 0;
 357         }
 358
 359         return we.changed ? DISK_EVENT_MEDIA_CHANGE : 0;
 360 }
 361
 362 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 363 {
 364         HvLpEvent_Rc hvrc;
 365         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 366         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 367         u64 flags = !!locking;
 368         struct viocd_waitevent we;
 369
 370         init_completion(&we.com);
 371
 372         /* Send the lockdoor event to OS/400 */
 373         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 374                         HvLpEvent_Type_VirtualIo,
 375                         viomajorsubtype_cdio | viocdlockdoor,
 376                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 377                         viopath_sourceinst(viopath_hostLp),
 378                         viopath_targetinst(viopath_hostLp),
 379                         (u64)&we, VIOVERSION << 16,
 380                         (device_no << 48) | (flags << 32), 0, 0, 0);
 381         if (hvrc != 0) {
 382                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 383                            (int)hvrc);
 384                 return -EIO;
 385         }
 386
 387         wait_for_completion(&we.com);
 388
 389         if (we.rc != 0)
 390                 return -EIO;
 391         return 0;
 392 }
 393
 394 static int viocd_packet(struct cdrom_device_info *cdi,
 395                 struct packet_command *cgc)
 396 {
 397         unsigned int buflen = cgc->buflen;
 398         int ret = -EIO;
 399
 400         switch (cgc->cmd[0]) {
 401         case GPCMD_READ_DISC_INFO:
 402                 {
 403                         disc_information *di = (disc_information *)cgc->buffer;
 404
 405                         if (buflen >= 2) {
 406                                 di->disc_information_length = cpu_to_be16(1);
 407                                 ret = 0;
 408                         }
 409                         if (buflen >= 3)
 410                                 di->erasable =
 411                                         (cdi->ops->capability & ~cdi->mask
 412                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 413                 }
 414                 break;
 415         case GPCMD_GET_CONFIGURATION:
 416                 if (cgc->cmd[3] == CDF_RWRT) {
 417                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 418
 419                         if ((buflen >=
 420                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 421                             (cdi->ops->capability & ~cdi->mask
 422                              & (CDC_DVD_RAM | CDC_RAM))) {
 423                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 424                                 rfd->curr = 1;
 425                                 ret = 0;
 426                         }
 427                 }
 428                 break;
 429         default:
 430                 if (cgc->sense) {
 431                         /* indicate Unknown code */
 432                         cgc->sense->sense_key = 0x05;
 433                         cgc->sense->asc = 0x20;
 434                         cgc->sense->ascq = 0x00;
 435                 }
 436                 break;
 437         }
 438
 439         cgc->stat = ret;
 440         return ret;
 441 }
 442
 443 static void restart_all_queues(int first_index)
 444 {
 445         int i;
 446
 447         for (i = first_index + 1; i < viocd_numdev; i++)
 448                 if (viocd_diskinfo[i].viocd_disk)
 449                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 450         for (i = 0; i <= first_index; i++)
 451                 if (viocd_diskinfo[i].viocd_disk)
 452                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 453 }
 454
 455 /* This routine handles incoming CD LP events */
 456 static void vio_handle_cd_event(struct HvLpEvent *event)
 457 {
 458         struct viocdlpevent *bevent;
 459         struct viocd_waitevent *pwe;
 460         struct disk_info *di;
 461         unsigned long flags;
 462         struct request *req;
 463
 464
 465         if (event == NULL)
 466                 /* Notification that a partition went away! */
 467                 return;
 468         /* First, we should NEVER get an int here...only acks */
 469         if (hvlpevent_is_int(event)) {
 470                 pr_warning("Yikes! got an int in viocd event handler!\n");
 471                 if (hvlpevent_need_ack(event)) {
 472                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 473                         HvCallEvent_ackLpEvent(event);
 474                 }
 475         }
 476
 477         bevent = (struct viocdlpevent *)event;
 478
 479         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 480         case viocdopen:
 481                 if (event->xRc == 0) {
 482                         di = &viocd_diskinfo[bevent->disk];
 483                         blk_queue_logical_block_size(di->viocd_disk->queue,
 484                                                      bevent->block_size);
 485                         set_capacity(di->viocd_disk,
 486                                         bevent->media_size *
 487                                         bevent->block_size / 512);
 488                 }
 489                 /* FALLTHROUGH !! */
 490         case viocdlockdoor:
 491                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 492 return_complete:
 493                 pwe->rc = event->xRc;
 494                 pwe->sub_result = bevent->sub_result;
 495                 complete(&pwe->com);
 496                 break;
 497
 498         case viocdcheck:
 499                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 500                 pwe->changed = bevent->flags;
 501                 goto return_complete;
 502
 503         case viocdclose:
 504                 break;
 505
 506         case viocdwrite:
 507         case viocdread:
 508                 /*
 509                  * Since this is running in interrupt mode, we need to
 510                  * make sure we're not stepping on any global I/O operations
 511                  */
 512                 di = &viocd_diskinfo[bevent->disk];
 513                 spin_lock_irqsave(&viocd_reqlock, flags);
 514                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 515                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 516                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 517                 req = (struct request *)bevent->event.xCorrelationToken;
 518                 rwreq--;
 519
 520                 if (event->xRc != HvLpEvent_Rc_Good) {
 521                         const struct vio_error_entry *err =
 522                                 vio_lookup_rc(viocd_err_table,
 523                                                 bevent->sub_result);
 524                         pr_warning("request %p failed with rc %d:0x%04X: %s\n",
 525                                    req, event->xRc,
 526                                    bevent->sub_result, err->msg);
 527                         __blk_end_request_all(req, -EIO);
 528                 } else
 529                         __blk_end_request_all(req, 0);
 530
 531                 /* restart handling of incoming requests */
 532                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 533                 restart_all_queues(bevent->disk);
 534                 break;
 535
 536         default:
 537                 pr_warning("message with invalid subtype %0x04X!\n",
 538                            event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 539                 if (hvlpevent_need_ack(event)) {
 540                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 541                         HvCallEvent_ackLpEvent(event);
 542                 }
 543         }
 544 }
 545
 546 static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 547                              void *arg)
 548 {
 549         return -EINVAL;
 550 }
 551
 552 static struct cdrom_device_ops viocd_dops = {
 553         .open = viocd_open,
 554         .release = viocd_release,
 555         .check_events = viocd_check_events,
 556         .lock_door = viocd_lock_door,
 557         .generic_packet = viocd_packet,
 558         .audio_ioctl = viocd_audio_ioctl,
 559         .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
 560 };
 561
 562 static int find_capability(const char *type)
 563 {
 564         struct capability_entry *entry;
 565
 566         for(entry = capability_table; entry->type; ++entry)
 567                 if(!strncmp(entry->type, type, 4))
 568                         break;
 569         return entry->capability;
 570 }
 571
 572 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 573 {
 574         struct gendisk *gendisk;
 575         int deviceno;
 576         struct disk_info *d;
 577         struct cdrom_device_info *c;
 578         struct request_queue *q;
 579         struct device_node *node = vdev->dev.of_node;
 580
 581         deviceno = vdev->unit_address;
 582         if (deviceno >= VIOCD_MAX_CD)
 583                 return -ENODEV;
 584         if (!node)
 585                 return -ENODEV;
 586
 587         if (deviceno >= viocd_numdev)
 588                 viocd_numdev = deviceno + 1;
 589
 590         d = &viocd_diskinfo[deviceno];
 591         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 592         d->type = of_get_property(node, "linux,vio_type", NULL);
 593         d->model = of_get_property(node, "linux,vio_model", NULL);
 594
 595         c = &d->viocd_info;
 596
 597         c->ops = &viocd_dops;
 598         c->speed = 4;
 599         c->capacity = 1;
 600         c->handle = d;
 601         c->mask = ~find_capability(d->type);
 602         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 603
 604         if (register_cdrom(c) != 0) {
 605                 pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
 606                 goto out;
 607         }
 608         pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
 609                 c->name, d->rsrcname, d->type, d->model);
 610         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 611         if (q == NULL) {
 612                 pr_warning("Cannot allocate queue for %s!\n", c->name);
 613                 goto out_unregister_cdrom;
 614         }
 615         gendisk = alloc_disk(1);
 616         if (gendisk == NULL) {
 617                 pr_warning("Cannot create gendisk for %s!\n", c->name);
 618                 goto out_cleanup_queue;
 619         }
 620         gendisk->major = VIOCD_MAJOR;
 621         gendisk->first_minor = deviceno;
 622         strncpy(gendisk->disk_name, c->name,
 623                         sizeof(gendisk->disk_name));
 624         blk_queue_max_segments(q, 1);
 625         blk_queue_max_hw_sectors(q, 4096 / 512);
 626         gendisk->queue = q;
 627         gendisk->fops = &viocd_fops;
 628         gendisk->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE |
 629                          GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
 630         gendisk->events = DISK_EVENT_MEDIA_CHANGE;
 631         set_capacity(gendisk, 0);
 632         gendisk->private_data = d;
 633         d->viocd_disk = gendisk;
 634         d->dev = &vdev->dev;
 635         gendisk->driverfs_dev = d->dev;
 636         add_disk(gendisk);
 637         return 0;
 638
 639 out_cleanup_queue:
 640         blk_cleanup_queue(q);
 641 out_unregister_cdrom:
 642         unregister_cdrom(c);
 643 out:
 644         return -ENODEV;
 645 }
 646
 647 static int viocd_remove(struct vio_dev *vdev)
 648 {
 649         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 650
 651         unregister_cdrom(&d->viocd_info);
 652         del_gendisk(d->viocd_disk);
 653         blk_cleanup_queue(d->viocd_disk->queue);
 654         put_disk(d->viocd_disk);
 655         return 0;
 656 }
 657
 658 /**
 659  * viocd_device_table: Used by vio.c to match devices that we
 660  * support.
 661  */
 662 static struct vio_device_id viocd_device_table[] __devinitdata = {
 663         { "block", "IBM,iSeries-viocd" },
 664         { "", "" }
 665 };
 666 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 667
 668 static struct vio_driver viocd_driver = {
 669         .id_table = viocd_device_table,
 670         .probe = viocd_probe,
 671         .remove = viocd_remove,
 672         .driver = {
 673                 .name = "viocd",
 674                 .owner = THIS_MODULE,
 675         }
 676 };
 677
 678 static int __init viocd_init(void)
 679 {
 680         int ret = 0;
 681
 682         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 683                 return -ENODEV;
 684
 685         if (viopath_hostLp == HvLpIndexInvalid) {
 686                 vio_set_hostlp();
 687                 /* If we don't have a host, bail out */
 688                 if (viopath_hostLp == HvLpIndexInvalid)
 689                         return -ENODEV;
 690         }
 691
 692         pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
 693
 694         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 695                 pr_warning("Unable to get major %d for %s\n",
 696                            VIOCD_MAJOR, VIOCD_DEVICE);
 697                 return -EIO;
 698         }
 699
 700         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 701                         MAX_CD_REQ + 2);
 702         if (ret) {
 703                 pr_warning("error opening path to host partition %d\n",
 704                            viopath_hostLp);
 705                 goto out_unregister;
 706         }
 707
 708         /* Initialize our request handler */
 709         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 710
 711         spin_lock_init(&viocd_reqlock);
 712
 713         ret = vio_register_driver(&viocd_driver);
 714         if (ret)
 715                 goto out_free_info;
 716
 717         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
 718                     &proc_viocd_operations);
 719         return 0;
 720
 721 out_free_info:
 722         vio_clearHandler(viomajorsubtype_cdio);
 723         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 724 out_unregister:
 725         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 726         return ret;
 727 }
 728
 729 static void __exit viocd_exit(void)
 730 {
 731         remove_proc_entry("iSeries/viocd", NULL);
 732         vio_unregister_driver(&viocd_driver);
 733         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 734         vio_clearHandler(viomajorsubtype_cdio);
 735         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 736 }
 737
 738 module_init(viocd_init);
 739 module_exit(viocd_exit);
 740 MODULE_LICENSE("GPL");