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[PATCH] switch cdrom_{open,release,ioctl} to sane APIs
[linux-2.6-omap-h63xx.git] / 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 #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  * 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 inode *inode, struct file *file)
155 {
156         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
157         return cdrom_open(&di->viocd_info, inode->i_bdev, file->f_mode);
158 }
159
160 static int viocd_blk_release(struct inode *inode, struct file *file)
161 {
162         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
163         cdrom_release(&di->viocd_info, file ? file->f_mode : 0);
164         return 0;
165 }
166
167 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
168                 unsigned cmd, unsigned long arg)
169 {
170         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
171         return cdrom_ioctl(&di->viocd_info, inode->i_bdev,
172                            file ? file->f_mode : 0, cmd, arg);
173 }
174
175 static int viocd_blk_media_changed(struct gendisk *disk)
176 {
177         struct disk_info *di = disk->private_data;
178         return cdrom_media_changed(&di->viocd_info);
179 }
180
181 struct block_device_operations viocd_fops = {
182         .owner =                THIS_MODULE,
183         .open =                 viocd_blk_open,
184         .release =              viocd_blk_release,
185         .ioctl =                viocd_blk_ioctl,
186         .media_changed =        viocd_blk_media_changed,
187 };
188
189 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
190 {
191         struct disk_info *diskinfo = cdi->handle;
192         int device_no = DEVICE_NR(diskinfo);
193         HvLpEvent_Rc hvrc;
194         struct viocd_waitevent we;
195
196         init_completion(&we.com);
197         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
198                         HvLpEvent_Type_VirtualIo,
199                         viomajorsubtype_cdio | viocdopen,
200                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
201                         viopath_sourceinst(viopath_hostLp),
202                         viopath_targetinst(viopath_hostLp),
203                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
204                         0, 0, 0);
205         if (hvrc != 0) {
206                 printk(VIOCD_KERN_WARNING
207                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
208                                 (int)hvrc);
209                 return -EIO;
210         }
211
212         wait_for_completion(&we.com);
213
214         if (we.rc) {
215                 const struct vio_error_entry *err =
216                         vio_lookup_rc(viocd_err_table, we.sub_result);
217                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
218                                 we.rc, we.sub_result, err->msg);
219                 return -err->errno;
220         }
221
222         return 0;
223 }
224
225 static void viocd_release(struct cdrom_device_info *cdi)
226 {
227         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
228         HvLpEvent_Rc hvrc;
229
230         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
231                         HvLpEvent_Type_VirtualIo,
232                         viomajorsubtype_cdio | viocdclose,
233                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
234                         viopath_sourceinst(viopath_hostLp),
235                         viopath_targetinst(viopath_hostLp), 0,
236                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
237         if (hvrc != 0)
238                 printk(VIOCD_KERN_WARNING
239                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
240                                 (int)hvrc);
241 }
242
243 /* Send a read or write request to OS/400 */
244 static int send_request(struct request *req)
245 {
246         HvLpEvent_Rc hvrc;
247         struct disk_info *diskinfo = req->rq_disk->private_data;
248         u64 len;
249         dma_addr_t dmaaddr;
250         int direction;
251         u16 cmd;
252         struct scatterlist sg;
253
254         BUG_ON(req->nr_phys_segments > 1);
255
256         if (rq_data_dir(req) == READ) {
257                 direction = DMA_FROM_DEVICE;
258                 cmd = viomajorsubtype_cdio | viocdread;
259         } else {
260                 direction = DMA_TO_DEVICE;
261                 cmd = viomajorsubtype_cdio | viocdwrite;
262         }
263
264         sg_init_table(&sg, 1);
265         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
266                 printk(VIOCD_KERN_WARNING
267                                 "error setting up scatter/gather list\n");
268                 return -1;
269         }
270
271         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
272                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
273                 return -1;
274         }
275         dmaaddr = sg_dma_address(&sg);
276         len = sg_dma_len(&sg);
277
278         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
279                         HvLpEvent_Type_VirtualIo, cmd,
280                         HvLpEvent_AckInd_DoAck,
281                         HvLpEvent_AckType_ImmediateAck,
282                         viopath_sourceinst(viopath_hostLp),
283                         viopath_targetinst(viopath_hostLp),
284                         (u64)req, VIOVERSION << 16,
285                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
286                         (u64)req->sector * 512, len, 0);
287         if (hvrc != HvLpEvent_Rc_Good) {
288                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
289                 return -1;
290         }
291
292         return 0;
293 }
294
295 static void viocd_end_request(struct request *req, int error)
296 {
297         int nsectors = req->hard_nr_sectors;
298
299         /*
300          * Make sure it's fully ended, and ensure that we process
301          * at least one sector.
302          */
303         if (blk_pc_request(req))
304                 nsectors = (req->data_len + 511) >> 9;
305         if (!nsectors)
306                 nsectors = 1;
307
308         if (__blk_end_request(req, error, nsectors << 9))
309                 BUG();
310 }
311
312 static int rwreq;
313
314 static void do_viocd_request(struct request_queue *q)
315 {
316         struct request *req;
317
318         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
319                 if (!blk_fs_request(req))
320                         viocd_end_request(req, -EIO);
321                 else if (send_request(req) < 0) {
322                         printk(VIOCD_KERN_WARNING
323                                         "unable to send message to OS/400!");
324                         viocd_end_request(req, -EIO);
325                 } else
326                         rwreq++;
327         }
328 }
329
330 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
331 {
332         struct viocd_waitevent we;
333         HvLpEvent_Rc hvrc;
334         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
335
336         init_completion(&we.com);
337
338         /* Send the open event to OS/400 */
339         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
340                         HvLpEvent_Type_VirtualIo,
341                         viomajorsubtype_cdio | viocdcheck,
342                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
343                         viopath_sourceinst(viopath_hostLp),
344                         viopath_targetinst(viopath_hostLp),
345                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
346                         0, 0, 0);
347         if (hvrc != 0) {
348                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
349                                 (int)hvrc);
350                 return -EIO;
351         }
352
353         wait_for_completion(&we.com);
354
355         /* Check the return code.  If bad, assume no change */
356         if (we.rc) {
357                 const struct vio_error_entry *err =
358                         vio_lookup_rc(viocd_err_table, we.sub_result);
359                 printk(VIOCD_KERN_WARNING
360                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
361                                 we.rc, we.sub_result, err->msg);
362                 return 0;
363         }
364
365         return we.changed;
366 }
367
368 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
369 {
370         HvLpEvent_Rc hvrc;
371         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
372         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
373         u64 flags = !!locking;
374         struct viocd_waitevent we;
375
376         init_completion(&we.com);
377
378         /* Send the lockdoor event to OS/400 */
379         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
380                         HvLpEvent_Type_VirtualIo,
381                         viomajorsubtype_cdio | viocdlockdoor,
382                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
383                         viopath_sourceinst(viopath_hostLp),
384                         viopath_targetinst(viopath_hostLp),
385                         (u64)&we, VIOVERSION << 16,
386                         (device_no << 48) | (flags << 32), 0, 0, 0);
387         if (hvrc != 0) {
388                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
389                                 (int)hvrc);
390                 return -EIO;
391         }
392
393         wait_for_completion(&we.com);
394
395         if (we.rc != 0)
396                 return -EIO;
397         return 0;
398 }
399
400 static int viocd_packet(struct cdrom_device_info *cdi,
401                 struct packet_command *cgc)
402 {
403         unsigned int buflen = cgc->buflen;
404         int ret = -EIO;
405
406         switch (cgc->cmd[0]) {
407         case GPCMD_READ_DISC_INFO:
408                 {
409                         disc_information *di = (disc_information *)cgc->buffer;
410
411                         if (buflen >= 2) {
412                                 di->disc_information_length = cpu_to_be16(1);
413                                 ret = 0;
414                         }
415                         if (buflen >= 3)
416                                 di->erasable =
417                                         (cdi->ops->capability & ~cdi->mask
418                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
419                 }
420                 break;
421         case GPCMD_GET_CONFIGURATION:
422                 if (cgc->cmd[3] == CDF_RWRT) {
423                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
424
425                         if ((buflen >=
426                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
427                             (cdi->ops->capability & ~cdi->mask
428                              & (CDC_DVD_RAM | CDC_RAM))) {
429                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
430                                 rfd->curr = 1;
431                                 ret = 0;
432                         }
433                 }
434                 break;
435         default:
436                 if (cgc->sense) {
437                         /* indicate Unknown code */
438                         cgc->sense->sense_key = 0x05;
439                         cgc->sense->asc = 0x20;
440                         cgc->sense->ascq = 0x00;
441                 }
442                 break;
443         }
444
445         cgc->stat = ret;
446         return ret;
447 }
448
449 static void restart_all_queues(int first_index)
450 {
451         int i;
452
453         for (i = first_index + 1; i < viocd_numdev; i++)
454                 if (viocd_diskinfo[i].viocd_disk)
455                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
456         for (i = 0; i <= first_index; i++)
457                 if (viocd_diskinfo[i].viocd_disk)
458                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
459 }
460
461 /* This routine handles incoming CD LP events */
462 static void vio_handle_cd_event(struct HvLpEvent *event)
463 {
464         struct viocdlpevent *bevent;
465         struct viocd_waitevent *pwe;
466         struct disk_info *di;
467         unsigned long flags;
468         struct request *req;
469
470
471         if (event == NULL)
472                 /* Notification that a partition went away! */
473                 return;
474         /* First, we should NEVER get an int here...only acks */
475         if (hvlpevent_is_int(event)) {
476                 printk(VIOCD_KERN_WARNING
477                                 "Yikes! got an int in viocd event handler!\n");
478                 if (hvlpevent_need_ack(event)) {
479                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
480                         HvCallEvent_ackLpEvent(event);
481                 }
482         }
483
484         bevent = (struct viocdlpevent *)event;
485
486         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
487         case viocdopen:
488                 if (event->xRc == 0) {
489                         di = &viocd_diskinfo[bevent->disk];
490                         blk_queue_hardsect_size(di->viocd_disk->queue,
491                                         bevent->block_size);
492                         set_capacity(di->viocd_disk,
493                                         bevent->media_size *
494                                         bevent->block_size / 512);
495                 }
496                 /* FALLTHROUGH !! */
497         case viocdlockdoor:
498                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
499 return_complete:
500                 pwe->rc = event->xRc;
501                 pwe->sub_result = bevent->sub_result;
502                 complete(&pwe->com);
503                 break;
504
505         case viocdcheck:
506                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
507                 pwe->changed = bevent->flags;
508                 goto return_complete;
509
510         case viocdclose:
511                 break;
512
513         case viocdwrite:
514         case viocdread:
515                 /*
516                  * Since this is running in interrupt mode, we need to
517                  * make sure we're not stepping on any global I/O operations
518                  */
519                 di = &viocd_diskinfo[bevent->disk];
520                 spin_lock_irqsave(&viocd_reqlock, flags);
521                 dma_unmap_single(di->dev, bevent->token, bevent->len,
522                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
523                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
524                 req = (struct request *)bevent->event.xCorrelationToken;
525                 rwreq--;
526
527                 if (event->xRc != HvLpEvent_Rc_Good) {
528                         const struct vio_error_entry *err =
529                                 vio_lookup_rc(viocd_err_table,
530                                                 bevent->sub_result);
531                         printk(VIOCD_KERN_WARNING "request %p failed "
532                                         "with rc %d:0x%04X: %s\n",
533                                         req, event->xRc,
534                                         bevent->sub_result, err->msg);
535                         viocd_end_request(req, -EIO);
536                 } else
537                         viocd_end_request(req, 0);
538
539                 /* restart handling of incoming requests */
540                 spin_unlock_irqrestore(&viocd_reqlock, flags);
541                 restart_all_queues(bevent->disk);
542                 break;
543
544         default:
545                 printk(VIOCD_KERN_WARNING
546                                 "message with invalid subtype %0x04X!\n",
547                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
548                 if (hvlpevent_need_ack(event)) {
549                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
550                         HvCallEvent_ackLpEvent(event);
551                 }
552         }
553 }
554
555 static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
556                              void *arg)
557 {
558         return -EINVAL;
559 }
560
561 static struct cdrom_device_ops viocd_dops = {
562         .open = viocd_open,
563         .release = viocd_release,
564         .media_changed = viocd_media_changed,
565         .lock_door = viocd_lock_door,
566         .generic_packet = viocd_packet,
567         .audio_ioctl = viocd_audio_ioctl,
568         .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
569 };
570
571 static int find_capability(const char *type)
572 {
573         struct capability_entry *entry;
574
575         for(entry = capability_table; entry->type; ++entry)
576                 if(!strncmp(entry->type, type, 4))
577                         break;
578         return entry->capability;
579 }
580
581 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
582 {
583         struct gendisk *gendisk;
584         int deviceno;
585         struct disk_info *d;
586         struct cdrom_device_info *c;
587         struct request_queue *q;
588         struct device_node *node = vdev->dev.archdata.of_node;
589
590         deviceno = vdev->unit_address;
591         if (deviceno > VIOCD_MAX_CD)
592                 return -ENODEV;
593         if (!node)
594                 return -ENODEV;
595
596         if (deviceno >= viocd_numdev)
597                 viocd_numdev = deviceno + 1;
598
599         d = &viocd_diskinfo[deviceno];
600         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
601         d->type = of_get_property(node, "linux,vio_type", NULL);
602         d->model = of_get_property(node, "linux,vio_model", NULL);
603
604         c = &d->viocd_info;
605
606         c->ops = &viocd_dops;
607         c->speed = 4;
608         c->capacity = 1;
609         c->handle = d;
610         c->mask = ~find_capability(d->type);
611         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
612
613         if (register_cdrom(c) != 0) {
614                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
615                                 c->name);
616                 goto out;
617         }
618         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
619                         "type %4.4s, model %3.3s\n",
620                         c->name, d->rsrcname, d->type, d->model);
621         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
622         if (q == NULL) {
623                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
624                                 c->name);
625                 goto out_unregister_cdrom;
626         }
627         gendisk = alloc_disk(1);
628         if (gendisk == NULL) {
629                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
630                                 c->name);
631                 goto out_cleanup_queue;
632         }
633         gendisk->major = VIOCD_MAJOR;
634         gendisk->first_minor = deviceno;
635         strncpy(gendisk->disk_name, c->name,
636                         sizeof(gendisk->disk_name));
637         blk_queue_max_hw_segments(q, 1);
638         blk_queue_max_phys_segments(q, 1);
639         blk_queue_max_sectors(q, 4096 / 512);
640         gendisk->queue = q;
641         gendisk->fops = &viocd_fops;
642         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
643         set_capacity(gendisk, 0);
644         gendisk->private_data = d;
645         d->viocd_disk = gendisk;
646         d->dev = &vdev->dev;
647         gendisk->driverfs_dev = d->dev;
648         add_disk(gendisk);
649         return 0;
650
651 out_cleanup_queue:
652         blk_cleanup_queue(q);
653 out_unregister_cdrom:
654         unregister_cdrom(c);
655 out:
656         return -ENODEV;
657 }
658
659 static int viocd_remove(struct vio_dev *vdev)
660 {
661         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
662
663         unregister_cdrom(&d->viocd_info);
664         del_gendisk(d->viocd_disk);
665         blk_cleanup_queue(d->viocd_disk->queue);
666         put_disk(d->viocd_disk);
667         return 0;
668 }
669
670 /**
671  * viocd_device_table: Used by vio.c to match devices that we
672  * support.
673  */
674 static struct vio_device_id viocd_device_table[] __devinitdata = {
675         { "block", "IBM,iSeries-viocd" },
676         { "", "" }
677 };
678 MODULE_DEVICE_TABLE(vio, viocd_device_table);
679
680 static struct vio_driver viocd_driver = {
681         .id_table = viocd_device_table,
682         .probe = viocd_probe,
683         .remove = viocd_remove,
684         .driver = {
685                 .name = "viocd",
686                 .owner = THIS_MODULE,
687         }
688 };
689
690 static int __init viocd_init(void)
691 {
692         int ret = 0;
693
694         if (!firmware_has_feature(FW_FEATURE_ISERIES))
695                 return -ENODEV;
696
697         if (viopath_hostLp == HvLpIndexInvalid) {
698                 vio_set_hostlp();
699                 /* If we don't have a host, bail out */
700                 if (viopath_hostLp == HvLpIndexInvalid)
701                         return -ENODEV;
702         }
703
704         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
705                         viopath_hostLp);
706
707         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
708                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
709                                 VIOCD_MAJOR, VIOCD_DEVICE);
710                 return -EIO;
711         }
712
713         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
714                         MAX_CD_REQ + 2);
715         if (ret) {
716                 printk(VIOCD_KERN_WARNING
717                                 "error opening path to host partition %d\n",
718                                 viopath_hostLp);
719                 goto out_unregister;
720         }
721
722         /* Initialize our request handler */
723         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
724
725         spin_lock_init(&viocd_reqlock);
726
727         ret = vio_register_driver(&viocd_driver);
728         if (ret)
729                 goto out_free_info;
730
731         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
732                     &proc_viocd_operations);
733         return 0;
734
735 out_free_info:
736         vio_clearHandler(viomajorsubtype_cdio);
737         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
738 out_unregister:
739         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
740         return ret;
741 }
742
743 static void __exit viocd_exit(void)
744 {
745         remove_proc_entry("iSeries/viocd", NULL);
746         vio_unregister_driver(&viocd_driver);
747         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
748         vio_clearHandler(viomajorsubtype_cdio);
749         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
750 }
751
752 module_init(viocd_init);
753 module_exit(viocd_exit);
754 MODULE_LICENSE("GPL");