16dada0627ee62d8c84922c1c92ac5c8565803fa
[linux-2.6.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 #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");