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34#include <linux/major.h>
35#include <linux/blkdev.h>
36#include <linux/cdrom.h>
37#include <linux/errno.h>
38#include <linux/init.h>
39#include <linux/dma-mapping.h>
40#include <linux/module.h>
41#include <linux/completion.h>
42#include <linux/proc_fs.h>
43#include <linux/seq_file.h>
44#include <linux/scatterlist.h>
45
46#include <asm/vio.h>
47#include <asm/iseries/hv_types.h>
48#include <asm/iseries/hv_lp_event.h>
49#include <asm/iseries/vio.h>
50#include <asm/firmware.h>
51
52#define VIOCD_DEVICE "iseries/vcd"
53
54#define VIOCD_VERS "1.06"
55
56#define VIOCD_KERN_WARNING KERN_WARNING "viocd: "
57#define VIOCD_KERN_INFO KERN_INFO "viocd: "
58
59
60
61
62#define VIOCD_MAX_CD HVMAXARCHITECTEDVIRTUALCDROMS
63
64static 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
82
83
84struct viocd_waitevent {
85 struct completion com;
86 int rc;
87 u16 sub_result;
88 int changed;
89};
90
91
92struct capability_entry {
93 char *type;
94 int capability;
95};
96
97static 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
108static int viocd_numdev;
109
110struct 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};
118static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
119
120#define DEVICE_NR(di) ((di) - &viocd_diskinfo[0])
121
122static spinlock_t viocd_reqlock;
123
124#define MAX_CD_REQ 1
125
126
127static 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
141static int proc_viocd_open(struct inode *inode, struct file *file)
142{
143 return single_open(file, proc_viocd_show, NULL);
144}
145
146static 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
154static 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
160static 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
167static 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 return cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
172}
173
174static int viocd_blk_media_changed(struct gendisk *disk)
175{
176 struct disk_info *di = disk->private_data;
177 return cdrom_media_changed(&di->viocd_info);
178}
179
180static const struct block_device_operations viocd_fops = {
181 .owner = THIS_MODULE,
182 .open = viocd_blk_open,
183 .release = viocd_blk_release,
184 .locked_ioctl = viocd_blk_ioctl,
185 .media_changed = viocd_blk_media_changed,
186};
187
188static int viocd_open(struct cdrom_device_info *cdi, int purpose)
189{
190 struct disk_info *diskinfo = cdi->handle;
191 int device_no = DEVICE_NR(diskinfo);
192 HvLpEvent_Rc hvrc;
193 struct viocd_waitevent we;
194
195 init_completion(&we.com);
196 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
197 HvLpEvent_Type_VirtualIo,
198 viomajorsubtype_cdio | viocdopen,
199 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
200 viopath_sourceinst(viopath_hostLp),
201 viopath_targetinst(viopath_hostLp),
202 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
203 0, 0, 0);
204 if (hvrc != 0) {
205 printk(VIOCD_KERN_WARNING
206 "bad rc on HvCallEvent_signalLpEventFast %d\n",
207 (int)hvrc);
208 return -EIO;
209 }
210
211 wait_for_completion(&we.com);
212
213 if (we.rc) {
214 const struct vio_error_entry *err =
215 vio_lookup_rc(viocd_err_table, we.sub_result);
216 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
217 we.rc, we.sub_result, err->msg);
218 return -err->errno;
219 }
220
221 return 0;
222}
223
224static void viocd_release(struct cdrom_device_info *cdi)
225{
226 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
227 HvLpEvent_Rc hvrc;
228
229 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
230 HvLpEvent_Type_VirtualIo,
231 viomajorsubtype_cdio | viocdclose,
232 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
233 viopath_sourceinst(viopath_hostLp),
234 viopath_targetinst(viopath_hostLp), 0,
235 VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
236 if (hvrc != 0)
237 printk(VIOCD_KERN_WARNING
238 "bad rc on HvCallEvent_signalLpEventFast %d\n",
239 (int)hvrc);
240}
241
242
243static int send_request(struct request *req)
244{
245 HvLpEvent_Rc hvrc;
246 struct disk_info *diskinfo = req->rq_disk->private_data;
247 u64 len;
248 dma_addr_t dmaaddr;
249 int direction;
250 u16 cmd;
251 struct scatterlist sg;
252
253 BUG_ON(req->nr_phys_segments > 1);
254
255 if (rq_data_dir(req) == READ) {
256 direction = DMA_FROM_DEVICE;
257 cmd = viomajorsubtype_cdio | viocdread;
258 } else {
259 direction = DMA_TO_DEVICE;
260 cmd = viomajorsubtype_cdio | viocdwrite;
261 }
262
263 sg_init_table(&sg, 1);
264 if (blk_rq_map_sg(req->q, req, &sg) == 0) {
265 printk(VIOCD_KERN_WARNING
266 "error setting up scatter/gather list\n");
267 return -1;
268 }
269
270 if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
271 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
272 return -1;
273 }
274 dmaaddr = sg_dma_address(&sg);
275 len = sg_dma_len(&sg);
276
277 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
278 HvLpEvent_Type_VirtualIo, cmd,
279 HvLpEvent_AckInd_DoAck,
280 HvLpEvent_AckType_ImmediateAck,
281 viopath_sourceinst(viopath_hostLp),
282 viopath_targetinst(viopath_hostLp),
283 (u64)req, VIOVERSION << 16,
284 ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
285 (u64)blk_rq_pos(req) * 512, len, 0);
286 if (hvrc != HvLpEvent_Rc_Good) {
287 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
288 return -1;
289 }
290
291 return 0;
292}
293
294static int rwreq;
295
296static void do_viocd_request(struct request_queue *q)
297{
298 struct request *req;
299
300 while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
301 if (!blk_fs_request(req))
302 __blk_end_request_all(req, -EIO);
303 else if (send_request(req) < 0) {
304 printk(VIOCD_KERN_WARNING
305 "unable to send message to OS/400!");
306 __blk_end_request_all(req, -EIO);
307 } else
308 rwreq++;
309 }
310}
311
312static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
313{
314 struct viocd_waitevent we;
315 HvLpEvent_Rc hvrc;
316 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
317
318 init_completion(&we.com);
319
320
321 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
322 HvLpEvent_Type_VirtualIo,
323 viomajorsubtype_cdio | viocdcheck,
324 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
325 viopath_sourceinst(viopath_hostLp),
326 viopath_targetinst(viopath_hostLp),
327 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
328 0, 0, 0);
329 if (hvrc != 0) {
330 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
331 (int)hvrc);
332 return -EIO;
333 }
334
335 wait_for_completion(&we.com);
336
337
338 if (we.rc) {
339 const struct vio_error_entry *err =
340 vio_lookup_rc(viocd_err_table, we.sub_result);
341 printk(VIOCD_KERN_WARNING
342 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
343 we.rc, we.sub_result, err->msg);
344 return 0;
345 }
346
347 return we.changed;
348}
349
350static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
351{
352 HvLpEvent_Rc hvrc;
353 u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
354
355 u64 flags = !!locking;
356 struct viocd_waitevent we;
357
358 init_completion(&we.com);
359
360
361 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
362 HvLpEvent_Type_VirtualIo,
363 viomajorsubtype_cdio | viocdlockdoor,
364 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
365 viopath_sourceinst(viopath_hostLp),
366 viopath_targetinst(viopath_hostLp),
367 (u64)&we, VIOVERSION << 16,
368 (device_no << 48) | (flags << 32), 0, 0, 0);
369 if (hvrc != 0) {
370 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
371 (int)hvrc);
372 return -EIO;
373 }
374
375 wait_for_completion(&we.com);
376
377 if (we.rc != 0)
378 return -EIO;
379 return 0;
380}
381
382static int viocd_packet(struct cdrom_device_info *cdi,
383 struct packet_command *cgc)
384{
385 unsigned int buflen = cgc->buflen;
386 int ret = -EIO;
387
388 switch (cgc->cmd[0]) {
389 case GPCMD_READ_DISC_INFO:
390 {
391 disc_information *di = (disc_information *)cgc->buffer;
392
393 if (buflen >= 2) {
394 di->disc_information_length = cpu_to_be16(1);
395 ret = 0;
396 }
397 if (buflen >= 3)
398 di->erasable =
399 (cdi->ops->capability & ~cdi->mask
400 & (CDC_DVD_RAM | CDC_RAM)) != 0;
401 }
402 break;
403 case GPCMD_GET_CONFIGURATION:
404 if (cgc->cmd[3] == CDF_RWRT) {
405 struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
406
407 if ((buflen >=
408 (sizeof(struct feature_header) + sizeof(*rfd))) &&
409 (cdi->ops->capability & ~cdi->mask
410 & (CDC_DVD_RAM | CDC_RAM))) {
411 rfd->feature_code = cpu_to_be16(CDF_RWRT);
412 rfd->curr = 1;
413 ret = 0;
414 }
415 }
416 break;
417 default:
418 if (cgc->sense) {
419
420 cgc->sense->sense_key = 0x05;
421 cgc->sense->asc = 0x20;
422 cgc->sense->ascq = 0x00;
423 }
424 break;
425 }
426
427 cgc->stat = ret;
428 return ret;
429}
430
431static void restart_all_queues(int first_index)
432{
433 int i;
434
435 for (i = first_index + 1; i < viocd_numdev; i++)
436 if (viocd_diskinfo[i].viocd_disk)
437 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
438 for (i = 0; i <= first_index; i++)
439 if (viocd_diskinfo[i].viocd_disk)
440 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
441}
442
443
444static void vio_handle_cd_event(struct HvLpEvent *event)
445{
446 struct viocdlpevent *bevent;
447 struct viocd_waitevent *pwe;
448 struct disk_info *di;
449 unsigned long flags;
450 struct request *req;
451
452
453 if (event == NULL)
454
455 return;
456
457 if (hvlpevent_is_int(event)) {
458 printk(VIOCD_KERN_WARNING
459 "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
479 case viocdlockdoor:
480 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
481return_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
499
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 printk(VIOCD_KERN_WARNING "request %p failed "
514 "with rc %d:0x%04X: %s\n",
515 req, event->xRc,
516 bevent->sub_result, err->msg);
517 __blk_end_request_all(req, -EIO);
518 } else
519 __blk_end_request_all(req, 0);
520
521
522 spin_unlock_irqrestore(&viocd_reqlock, flags);
523 restart_all_queues(bevent->disk);
524 break;
525
526 default:
527 printk(VIOCD_KERN_WARNING
528 "message with invalid subtype %0x04X!\n",
529 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
530 if (hvlpevent_need_ack(event)) {
531 event->xRc = HvLpEvent_Rc_InvalidSubtype;
532 HvCallEvent_ackLpEvent(event);
533 }
534 }
535}
536
537static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
538 void *arg)
539{
540 return -EINVAL;
541}
542
543static struct cdrom_device_ops viocd_dops = {
544 .open = viocd_open,
545 .release = viocd_release,
546 .media_changed = viocd_media_changed,
547 .lock_door = viocd_lock_door,
548 .generic_packet = viocd_packet,
549 .audio_ioctl = viocd_audio_ioctl,
550 .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
551};
552
553static int find_capability(const char *type)
554{
555 struct capability_entry *entry;
556
557 for(entry = capability_table; entry->type; ++entry)
558 if(!strncmp(entry->type, type, 4))
559 break;
560 return entry->capability;
561}
562
563static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
564{
565 struct gendisk *gendisk;
566 int deviceno;
567 struct disk_info *d;
568 struct cdrom_device_info *c;
569 struct request_queue *q;
570 struct device_node *node = vdev->dev.archdata.of_node;
571
572 deviceno = vdev->unit_address;
573 if (deviceno >= VIOCD_MAX_CD)
574 return -ENODEV;
575 if (!node)
576 return -ENODEV;
577
578 if (deviceno >= viocd_numdev)
579 viocd_numdev = deviceno + 1;
580
581 d = &viocd_diskinfo[deviceno];
582 d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
583 d->type = of_get_property(node, "linux,vio_type", NULL);
584 d->model = of_get_property(node, "linux,vio_model", NULL);
585
586 c = &d->viocd_info;
587
588 c->ops = &viocd_dops;
589 c->speed = 4;
590 c->capacity = 1;
591 c->handle = d;
592 c->mask = ~find_capability(d->type);
593 sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
594
595 if (register_cdrom(c) != 0) {
596 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
597 c->name);
598 goto out;
599 }
600 printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
601 "type %4.4s, model %3.3s\n",
602 c->name, d->rsrcname, d->type, d->model);
603 q = blk_init_queue(do_viocd_request, &viocd_reqlock);
604 if (q == NULL) {
605 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
606 c->name);
607 goto out_unregister_cdrom;
608 }
609 gendisk = alloc_disk(1);
610 if (gendisk == NULL) {
611 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
612 c->name);
613 goto out_cleanup_queue;
614 }
615 gendisk->major = VIOCD_MAJOR;
616 gendisk->first_minor = deviceno;
617 strncpy(gendisk->disk_name, c->name,
618 sizeof(gendisk->disk_name));
619 blk_queue_max_hw_segments(q, 1);
620 blk_queue_max_phys_segments(q, 1);
621 blk_queue_max_sectors(q, 4096 / 512);
622 gendisk->queue = q;
623 gendisk->fops = &viocd_fops;
624 gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
625 set_capacity(gendisk, 0);
626 gendisk->private_data = d;
627 d->viocd_disk = gendisk;
628 d->dev = &vdev->dev;
629 gendisk->driverfs_dev = d->dev;
630 add_disk(gendisk);
631 return 0;
632
633out_cleanup_queue:
634 blk_cleanup_queue(q);
635out_unregister_cdrom:
636 unregister_cdrom(c);
637out:
638 return -ENODEV;
639}
640
641static int viocd_remove(struct vio_dev *vdev)
642{
643 struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
644
645 unregister_cdrom(&d->viocd_info);
646 del_gendisk(d->viocd_disk);
647 blk_cleanup_queue(d->viocd_disk->queue);
648 put_disk(d->viocd_disk);
649 return 0;
650}
651
652
653
654
655
656static struct vio_device_id viocd_device_table[] __devinitdata = {
657 { "block", "IBM,iSeries-viocd" },
658 { "", "" }
659};
660MODULE_DEVICE_TABLE(vio, viocd_device_table);
661
662static struct vio_driver viocd_driver = {
663 .id_table = viocd_device_table,
664 .probe = viocd_probe,
665 .remove = viocd_remove,
666 .driver = {
667 .name = "viocd",
668 .owner = THIS_MODULE,
669 }
670};
671
672static int __init viocd_init(void)
673{
674 int ret = 0;
675
676 if (!firmware_has_feature(FW_FEATURE_ISERIES))
677 return -ENODEV;
678
679 if (viopath_hostLp == HvLpIndexInvalid) {
680 vio_set_hostlp();
681
682 if (viopath_hostLp == HvLpIndexInvalid)
683 return -ENODEV;
684 }
685
686 printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
687 viopath_hostLp);
688
689 if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
690 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
691 VIOCD_MAJOR, VIOCD_DEVICE);
692 return -EIO;
693 }
694
695 ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
696 MAX_CD_REQ + 2);
697 if (ret) {
698 printk(VIOCD_KERN_WARNING
699 "error opening path to host partition %d\n",
700 viopath_hostLp);
701 goto out_unregister;
702 }
703
704
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
717out_free_info:
718 vio_clearHandler(viomajorsubtype_cdio);
719 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
720out_unregister:
721 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
722 return ret;
723}
724
725static 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
734module_init(viocd_init);
735module_exit(viocd_exit);
736MODULE_LICENSE("GPL");
737
