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