aboutsummaryrefslogtreecommitdiff
path: root/drivers/cdrom/viocd.c
blob: 9b1624e0ddeb5ae7615478c67ec03ec2f4a3a0e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
/* -*- linux-c -*-
 *  drivers/cdrom/viocd.c
 *
 *  iSeries Virtual CD Rom
 *
 *  Authors: Dave Boutcher <boutcher@us.ibm.com>
 *           Ryan Arnold <ryanarn@us.ibm.com>
 *           Colin Devilbiss <devilbis@us.ibm.com>
 *           Stephen Rothwell
 *
 * (C) Copyright 2000-2004 IBM Corporation
 *
 * This program is free software;  you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) anyu later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * This routine provides access to CD ROM drives owned and managed by an
 * OS/400 partition running on the same box as this Linux partition.
 *
 * All operations are performed by sending messages back and forth to
 * the OS/400 partition.
 */

#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/scatterlist.h>

#include <asm/vio.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/vio.h>
#include <asm/firmware.h>

#define VIOCD_DEVICE			"iseries/vcd"

#define VIOCD_VERS "1.06"

#define VIOCD_KERN_WARNING		KERN_WARNING "viocd: "
#define VIOCD_KERN_INFO			KERN_INFO "viocd: "

/*
 * Should probably make this a module parameter....sigh
 */
#define VIOCD_MAX_CD	HVMAXARCHITECTEDVIRTUALCDROMS

static const struct vio_error_entry viocd_err_table[] = {
	{0x0201, EINVAL, "Invalid Range"},
	{0x0202, EINVAL, "Invalid Token"},
	{0x0203, EIO, "DMA Error"},
	{0x0204, EIO, "Use Error"},
	{0x0205, EIO, "Release Error"},
	{0x0206, EINVAL, "Invalid CD"},
	{0x020C, EROFS, "Read Only Device"},
	{0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
	{0x020E, EIO, "Optical System Error (Varied Off?)"},
	{0x02FF, EIO, "Internal Error"},
	{0x3010, EIO, "Changed Volume"},
	{0xC100, EIO, "Optical System Error"},
	{0x0000, 0, NULL},
};

/*
 * This is the structure we use to exchange info between driver and interrupt
 * handler
 */
struct viocd_waitevent {
	struct completion	com;
	int			rc;
	u16			sub_result;
	int			changed;
};

/* this is a lookup table for the true capabilities of a device */
struct capability_entry {
	char	*type;
	int	capability;
};

static struct capability_entry capability_table[] __initdata = {
	{ "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
	{ "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
	{ "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
	{ "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
	{ "6321", CDC_LOCK },
	{ "632B", 0 },
	{ NULL  , CDC_LOCK },
};

/* These are our internal structures for keeping track of devices */
static int viocd_numdev;

struct disk_info {
	struct gendisk			*viocd_disk;
	struct cdrom_device_info	viocd_info;
	struct device			*dev;
	const char			*rsrcname;
	const char			*type;
	const char			*model;
};
static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];

#define DEVICE_NR(di)	((di) - &viocd_diskinfo[0])

static spinlock_t viocd_reqlock;

#define MAX_CD_REQ	1

/* procfs support */
static int proc_viocd_show(struct seq_file *m, void *v)
{
	int i;

	for (i = 0; i < viocd_numdev; i++) {
		seq_printf(m, "viocd device %d is iSeries resource %10.10s"
				"type %4.4s, model %3.3s\n",
				i, viocd_diskinfo[i].rsrcname,
				viocd_diskinfo[i].type,
				viocd_diskinfo[i].model);
	}
	return 0;
}

static int proc_viocd_open(struct inode *inode, struct file *file)
{
	return single_open(file, proc_viocd_show, NULL);
}

static const struct file_operations proc_viocd_operations = {
	.owner		= THIS_MODULE,
	.open		= proc_viocd_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
{
	struct disk_info *di = bdev->bd_disk->private_data;
	return cdrom_open(&di->viocd_info, bdev, mode);
}

static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
{
	struct disk_info *di = disk->private_data;
	cdrom_release(&di->viocd_info, mode);
	return 0;
}

static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned cmd, unsigned long arg)
{
	struct disk_info *di = bdev->bd_disk->private_data;
	return cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
}

static int viocd_blk_media_changed(struct gendisk *disk)
{
	struct disk_info *di = disk->private_data;
	return cdrom_media_changed(&di->viocd_info);
}

struct block_device_operations viocd_fops = {
	.owner =		THIS_MODULE,
	.open =			viocd_blk_open,
	.release =		viocd_blk_release,
	.locked_ioctl =		viocd_blk_ioctl,
	.media_changed =	viocd_blk_media_changed,
};

static int viocd_open(struct cdrom_device_info *cdi, int purpose)
{
        struct disk_info *diskinfo = cdi->handle;
	int device_no = DEVICE_NR(diskinfo);
	HvLpEvent_Rc hvrc;
	struct viocd_waitevent we;

	init_completion(&we.com);
	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_cdio | viocdopen,
			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
			0, 0, 0);
	if (hvrc != 0) {
		printk(VIOCD_KERN_WARNING
				"bad rc on HvCallEvent_signalLpEventFast %d\n",
				(int)hvrc);
		return -EIO;
	}

	wait_for_completion(&we.com);

	if (we.rc) {
		const struct vio_error_entry *err =
			vio_lookup_rc(viocd_err_table, we.sub_result);
		printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
				we.rc, we.sub_result, err->msg);
		return -err->errno;
	}

	return 0;
}

static void viocd_release(struct cdrom_device_info *cdi)
{
	int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
	HvLpEvent_Rc hvrc;

	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_cdio | viocdclose,
			HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp), 0,
			VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
	if (hvrc != 0)
		printk(VIOCD_KERN_WARNING
				"bad rc on HvCallEvent_signalLpEventFast %d\n",
				(int)hvrc);
}

/* Send a read or write request to OS/400 */
static int send_request(struct request *req)
{
	HvLpEvent_Rc hvrc;
	struct disk_info *diskinfo = req->rq_disk->private_data;
	u64 len;
	dma_addr_t dmaaddr;
	int direction;
	u16 cmd;
	struct scatterlist sg;

	BUG_ON(req->nr_phys_segments > 1);

	if (rq_data_dir(req) == READ) {
		direction = DMA_FROM_DEVICE;
		cmd = viomajorsubtype_cdio | viocdread;
	} else {
		direction = DMA_TO_DEVICE;
		cmd = viomajorsubtype_cdio | viocdwrite;
	}

	sg_init_table(&sg, 1);
        if (blk_rq_map_sg(req->q, req, &sg) == 0) {
		printk(VIOCD_KERN_WARNING
				"error setting up scatter/gather list\n");
		return -1;
	}

	if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
		printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
		return -1;
	}
	dmaaddr = sg_dma_address(&sg);
	len = sg_dma_len(&sg);

	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo, cmd,
			HvLpEvent_AckInd_DoAck,
			HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)req, VIOVERSION << 16,
			((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
			(u64)req->sector * 512, len, 0);
	if (hvrc != HvLpEvent_Rc_Good) {
		printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
		return -1;
	}

	return 0;
}

static void viocd_end_request(struct request *req, int error)
{
	int nsectors = req->hard_nr_sectors;

	/*
	 * Make sure it's fully ended, and ensure that we process
	 * at least one sector.
	 */
	if (blk_pc_request(req))
		nsectors = (req->data_len + 511) >> 9;
	if (!nsectors)
		nsectors = 1;

	if (__blk_end_request(req, error, nsectors << 9))
		BUG();
}

static int rwreq;

static void do_viocd_request(struct request_queue *q)
{
	struct request *req;

	while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
		if (!blk_fs_request(req))
			viocd_end_request(req, -EIO);
		else if (send_request(req) < 0) {
			printk(VIOCD_KERN_WARNING
					"unable to send message to OS/400!");
			viocd_end_request(req, -EIO);
		} else
			rwreq++;
	}
}

static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
{
	struct viocd_waitevent we;
	HvLpEvent_Rc hvrc;
	int device_no = DEVICE_NR((struct disk_info *)cdi->handle);

	init_completion(&we.com);

	/* Send the open event to OS/400 */
	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_cdio | viocdcheck,
			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
			0, 0, 0);
	if (hvrc != 0) {
		printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
				(int)hvrc);
		return -EIO;
	}

	wait_for_completion(&we.com);

	/* Check the return code.  If bad, assume no change */
	if (we.rc) {
		const struct vio_error_entry *err =
			vio_lookup_rc(viocd_err_table, we.sub_result);
		printk(VIOCD_KERN_WARNING
				"bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
				we.rc, we.sub_result, err->msg);
		return 0;
	}

	return we.changed;
}

static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
{
	HvLpEvent_Rc hvrc;
	u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
	/* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
	u64 flags = !!locking;
	struct viocd_waitevent we;

	init_completion(&we.com);

	/* Send the lockdoor event to OS/400 */
	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_cdio | viocdlockdoor,
			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)&we, VIOVERSION << 16,
			(device_no << 48) | (flags << 32), 0, 0, 0);
	if (hvrc != 0) {
		printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
				(int)hvrc);
		return -EIO;
	}

	wait_for_completion(&we.com);

	if (we.rc != 0)
		return -EIO;
	return 0;
}

static int viocd_packet(struct cdrom_device_info *cdi,
		struct packet_command *cgc)
{
	unsigned int buflen = cgc->buflen;
	int ret = -EIO;

	switch (cgc->cmd[0]) {
	case GPCMD_READ_DISC_INFO:
		{
			disc_information *di = (disc_information *)cgc->buffer;

			if (buflen >= 2) {
				di->disc_information_length = cpu_to_be16(1);
				ret = 0;
			}
			if (buflen >= 3)
				di->erasable =
					(cdi->ops->capability & ~cdi->mask
					 & (CDC_DVD_RAM | CDC_RAM)) != 0;
		}
		break;
	case GPCMD_GET_CONFIGURATION:
		if (cgc->cmd[3] == CDF_RWRT) {
			struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));

			if ((buflen >=
			     (sizeof(struct feature_header) + sizeof(*rfd))) &&
			    (cdi->ops->capability & ~cdi->mask
			     & (CDC_DVD_RAM | CDC_RAM))) {
				rfd->feature_code = cpu_to_be16(CDF_RWRT);
				rfd->curr = 1;
				ret = 0;
			}
		}
		break;
	default:
		if (cgc->sense) {
			/* indicate Unknown code */
			cgc->sense->sense_key = 0x05;
			cgc->sense->asc = 0x20;
			cgc->sense->ascq = 0x00;
		}
		break;
	}

	cgc->stat = ret;
	return ret;
}

static void restart_all_queues(int first_index)
{
	int i;

	for (i = first_index + 1; i < viocd_numdev; i++)
		if (viocd_diskinfo[i].viocd_disk)
			blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
	for (i = 0; i <= first_index; i++)
		if (viocd_diskinfo[i].viocd_disk)
			blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
}

/* This routine handles incoming CD LP events */
static void vio_handle_cd_event(struct HvLpEvent *event)
{
	struct viocdlpevent *bevent;
	struct viocd_waitevent *pwe;
	struct disk_info *di;
	unsigned long flags;
	struct request *req;


	if (event == NULL)
		/* Notification that a partition went away! */
		return;
	/* First, we should NEVER get an int here...only acks */
	if (hvlpevent_is_int(event)) {
		printk(VIOCD_KERN_WARNING
				"Yikes! got an int in viocd event handler!\n");
		if (hvlpevent_need_ack(event)) {
			event->xRc = HvLpEvent_Rc_InvalidSubtype;
			HvCallEvent_ackLpEvent(event);
		}
	}

	bevent = (struct viocdlpevent *)event;

	switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
	case viocdopen:
		if (event->xRc == 0) {
			di = &viocd_diskinfo[bevent->disk];
			blk_queue_hardsect_size(di->viocd_disk->queue,
					bevent->block_size);
			set_capacity(di->viocd_disk,
					bevent->media_size *
					bevent->block_size / 512);
		}
		/* FALLTHROUGH !! */
	case viocdlockdoor:
		pwe = (struct viocd_waitevent *)event->xCorrelationToken;
return_complete:
		pwe->rc = event->xRc;
		pwe->sub_result = bevent->sub_result;
		complete(&pwe->com);
		break;

	case viocdcheck:
		pwe = (struct viocd_waitevent *)event->xCorrelationToken;
		pwe->changed = bevent->flags;
		goto return_complete;

	case viocdclose:
		break;

	case viocdwrite:
	case viocdread:
		/*
		 * Since this is running in interrupt mode, we need to
		 * make sure we're not stepping on any global I/O operations
		 */
		di = &viocd_diskinfo[bevent->disk];
		spin_lock_irqsave(&viocd_reqlock, flags);
		dma_unmap_single(di->dev, bevent->token, bevent->len,
				((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
				?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
		req = (struct request *)bevent->event.xCorrelationToken;
		rwreq--;

		if (event->xRc != HvLpEvent_Rc_Good) {
			const struct vio_error_entry *err =
				vio_lookup_rc(viocd_err_table,
						bevent->sub_result);
			printk(VIOCD_KERN_WARNING "request %p failed "
					"with rc %d:0x%04X: %s\n",
					req, event->xRc,
					bevent->sub_result, err->msg);
			viocd_end_request(req, -EIO);
		} else
			viocd_end_request(req, 0);

		/* restart handling of incoming requests */
		spin_unlock_irqrestore(&viocd_reqlock, flags);
		restart_all_queues(bevent->disk);
		break;

	default:
		printk(VIOCD_KERN_WARNING
				"message with invalid subtype %0x04X!\n",
				event->xSubtype & VIOMINOR_SUBTYPE_MASK);
		if (hvlpevent_need_ack(event)) {
			event->xRc = HvLpEvent_Rc_InvalidSubtype;
			HvCallEvent_ackLpEvent(event);
		}
	}
}

static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
			     void *arg)
{
	return -EINVAL;
}

static struct cdrom_device_ops viocd_dops = {
	.open = viocd_open,
	.release = viocd_release,
	.media_changed = viocd_media_changed,
	.lock_door = viocd_lock_door,
	.generic_packet = viocd_packet,
	.audio_ioctl = viocd_audio_ioctl,
	.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
};

static int find_capability(const char *type)
{
	struct capability_entry *entry;

	for(entry = capability_table; entry->type; ++entry)
		if(!strncmp(entry->type, type, 4))
			break;
	return entry->capability;
}

static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
	struct gendisk *gendisk;
	int deviceno;
	struct disk_info *d;
	struct cdrom_device_info *c;
	struct request_queue *q;
	struct device_node *node = vdev->dev.archdata.of_node;

	deviceno = vdev->unit_address;
	if (deviceno >= VIOCD_MAX_CD)
		return -ENODEV;
	if (!node)
		return -ENODEV;

	if (deviceno >= viocd_numdev)
		viocd_numdev = deviceno + 1;

	d = &viocd_diskinfo[deviceno];
	d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
	d->type = of_get_property(node, "linux,vio_type", NULL);
	d->model = of_get_property(node, "linux,vio_model", NULL);

	c = &d->viocd_info;

	c->ops = &viocd_dops;
	c->speed = 4;
	c->capacity = 1;
	c->handle = d;
	c->mask = ~find_capability(d->type);
	sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);

	if (register_cdrom(c) != 0) {
		printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
				c->name);
		goto out;
	}
	printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
			"type %4.4s, model %3.3s\n",
			c->name, d->rsrcname, d->type, d->model);
	q = blk_init_queue(do_viocd_request, &viocd_reqlock);
	if (q == NULL) {
		printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
				c->name);
		goto out_unregister_cdrom;
	}
	gendisk = alloc_disk(1);
	if (gendisk == NULL) {
		printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
				c->name);
		goto out_cleanup_queue;
	}
	gendisk->major = VIOCD_MAJOR;
	gendisk->first_minor = deviceno;
	strncpy(gendisk->disk_name, c->name,
			sizeof(gendisk->disk_name));
	blk_queue_max_hw_segments(q, 1);
	blk_queue_max_phys_segments(q, 1);
	blk_queue_max_sectors(q, 4096 / 512);
	gendisk->queue = q;
	gendisk->fops = &viocd_fops;
	gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
	set_capacity(gendisk, 0);
	gendisk->private_data = d;
	d->viocd_disk = gendisk;
	d->dev = &vdev->dev;
	gendisk->driverfs_dev = d->dev;
	add_disk(gendisk);
	return 0;

out_cleanup_queue:
	blk_cleanup_queue(q);
out_unregister_cdrom:
	unregister_cdrom(c);
out:
	return -ENODEV;
}

static int viocd_remove(struct vio_dev *vdev)
{
	struct disk_info *d = &viocd_diskinfo[vdev->unit_address];

	unregister_cdrom(&d->viocd_info);
	del_gendisk(d->viocd_disk);
	blk_cleanup_queue(d->viocd_disk->queue);
	put_disk(d->viocd_disk);
	return 0;
}

/**
 * viocd_device_table: Used by vio.c to match devices that we
 * support.
 */
static struct vio_device_id viocd_device_table[] __devinitdata = {
	{ "block", "IBM,iSeries-viocd" },
	{ "", "" }
};
MODULE_DEVICE_TABLE(vio, viocd_device_table);

static struct vio_driver viocd_driver = {
	.id_table = viocd_device_table,
	.probe = viocd_probe,
	.remove = viocd_remove,
	.driver = {
		.name = "viocd",
		.owner = THIS_MODULE,
	}
};

static int __init viocd_init(void)
{
	int ret = 0;

	if (!firmware_has_feature(FW_FEATURE_ISERIES))
		return -ENODEV;

	if (viopath_hostLp == HvLpIndexInvalid) {
		vio_set_hostlp();
		/* If we don't have a host, bail out */
		if (viopath_hostLp == HvLpIndexInvalid)
			return -ENODEV;
	}

	printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
			viopath_hostLp);

	if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
		printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
				VIOCD_MAJOR, VIOCD_DEVICE);
		return -EIO;
	}

	ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
			MAX_CD_REQ + 2);
	if (ret) {
		printk(VIOCD_KERN_WARNING
				"error opening path to host partition %d\n",
				viopath_hostLp);
		goto out_unregister;
	}

	/* Initialize our request handler */
	vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);

	spin_lock_init(&viocd_reqlock);

	ret = vio_register_driver(&viocd_driver);
	if (ret)
		goto out_free_info;

	proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
		    &proc_viocd_operations);
	return 0;

out_free_info:
	vio_clearHandler(viomajorsubtype_cdio);
	viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
out_unregister:
	unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
	return ret;
}

static void __exit viocd_exit(void)
{
	remove_proc_entry("iSeries/viocd", NULL);
	vio_unregister_driver(&viocd_driver);
	viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
	vio_clearHandler(viomajorsubtype_cdio);
	unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
}

module_init(viocd_init);
module_exit(viocd_exit);
MODULE_LICENSE("GPL");