gdrom,viocd: Convert to bdops->check_events()
[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/mutex.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 DEFINE_MUTEX(viocd_mutex);
65 static const struct vio_error_entry viocd_err_table[] = {
66         {0x0201, EINVAL, "Invalid Range"},
67         {0x0202, EINVAL, "Invalid Token"},
68         {0x0203, EIO, "DMA Error"},
69         {0x0204, EIO, "Use Error"},
70         {0x0205, EIO, "Release Error"},
71         {0x0206, EINVAL, "Invalid CD"},
72         {0x020C, EROFS, "Read Only Device"},
73         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
74         {0x020E, EIO, "Optical System Error (Varied Off?)"},
75         {0x02FF, EIO, "Internal Error"},
76         {0x3010, EIO, "Changed Volume"},
77         {0xC100, EIO, "Optical System Error"},
78         {0x0000, 0, NULL},
79 };
80
81 /*
82  * This is the structure we use to exchange info between driver and interrupt
83  * handler
84  */
85 struct viocd_waitevent {
86         struct completion       com;
87         int                     rc;
88         u16                     sub_result;
89         int                     changed;
90 };
91
92 /* this is a lookup table for the true capabilities of a device */
93 struct capability_entry {
94         char    *type;
95         int     capability;
96 };
97
98 static struct capability_entry capability_table[] __initdata = {
99         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
100         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
101         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
102         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
103         { "6321", CDC_LOCK },
104         { "632B", 0 },
105         { NULL  , CDC_LOCK },
106 };
107
108 /* These are our internal structures for keeping track of devices */
109 static int viocd_numdev;
110
111 struct disk_info {
112         struct gendisk                  *viocd_disk;
113         struct cdrom_device_info        viocd_info;
114         struct device                   *dev;
115         const char                      *rsrcname;
116         const char                      *type;
117         const char                      *model;
118 };
119 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
120
121 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
122
123 static spinlock_t viocd_reqlock;
124
125 #define MAX_CD_REQ      1
126
127 /* procfs support */
128 static int proc_viocd_show(struct seq_file *m, void *v)
129 {
130         int i;
131
132         for (i = 0; i < viocd_numdev; i++) {
133                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
134                                 "type %4.4s, model %3.3s\n",
135                                 i, viocd_diskinfo[i].rsrcname,
136                                 viocd_diskinfo[i].type,
137                                 viocd_diskinfo[i].model);
138         }
139         return 0;
140 }
141
142 static int proc_viocd_open(struct inode *inode, struct file *file)
143 {
144         return single_open(file, proc_viocd_show, NULL);
145 }
146
147 static const struct file_operations proc_viocd_operations = {
148         .owner          = THIS_MODULE,
149         .open           = proc_viocd_open,
150         .read           = seq_read,
151         .llseek         = seq_lseek,
152         .release        = single_release,
153 };
154
155 static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
156 {
157         struct disk_info *di = bdev->bd_disk->private_data;
158         int ret;
159
160         mutex_lock(&viocd_mutex);
161         ret = cdrom_open(&di->viocd_info, bdev, mode);
162         mutex_unlock(&viocd_mutex);
163
164         return ret;
165 }
166
167 static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
168 {
169         struct disk_info *di = disk->private_data;
170         mutex_lock(&viocd_mutex);
171         cdrom_release(&di->viocd_info, mode);
172         mutex_unlock(&viocd_mutex);
173         return 0;
174 }
175
176 static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
177                 unsigned cmd, unsigned long arg)
178 {
179         struct disk_info *di = bdev->bd_disk->private_data;
180         int ret;
181
182         mutex_lock(&viocd_mutex);
183         ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
184         mutex_unlock(&viocd_mutex);
185
186         return ret;
187 }
188
189 static unsigned int viocd_blk_check_events(struct gendisk *disk,
190                                            unsigned int clearing)
191 {
192         struct disk_info *di = disk->private_data;
193         return cdrom_check_events(&di->viocd_info, clearing);
194 }
195
196 static const struct block_device_operations viocd_fops = {
197         .owner =                THIS_MODULE,
198         .open =                 viocd_blk_open,
199         .release =              viocd_blk_release,
200         .ioctl =                viocd_blk_ioctl,
201         .check_events =         viocd_blk_check_events,
202 };
203
204 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
205 {
206         struct disk_info *diskinfo = cdi->handle;
207         int device_no = DEVICE_NR(diskinfo);
208         HvLpEvent_Rc hvrc;
209         struct viocd_waitevent we;
210
211         init_completion(&we.com);
212         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
213                         HvLpEvent_Type_VirtualIo,
214                         viomajorsubtype_cdio | viocdopen,
215                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
216                         viopath_sourceinst(viopath_hostLp),
217                         viopath_targetinst(viopath_hostLp),
218                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
219                         0, 0, 0);
220         if (hvrc != 0) {
221                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
222                            (int)hvrc);
223                 return -EIO;
224         }
225
226         wait_for_completion(&we.com);
227
228         if (we.rc) {
229                 const struct vio_error_entry *err =
230                         vio_lookup_rc(viocd_err_table, we.sub_result);
231                 pr_warning("bad rc %d:0x%04X on open: %s\n",
232                            we.rc, we.sub_result, err->msg);
233                 return -err->errno;
234         }
235
236         return 0;
237 }
238
239 static void viocd_release(struct cdrom_device_info *cdi)
240 {
241         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
242         HvLpEvent_Rc hvrc;
243
244         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
245                         HvLpEvent_Type_VirtualIo,
246                         viomajorsubtype_cdio | viocdclose,
247                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
248                         viopath_sourceinst(viopath_hostLp),
249                         viopath_targetinst(viopath_hostLp), 0,
250                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
251         if (hvrc != 0)
252                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
253                            (int)hvrc);
254 }
255
256 /* Send a read or write request to OS/400 */
257 static int send_request(struct request *req)
258 {
259         HvLpEvent_Rc hvrc;
260         struct disk_info *diskinfo = req->rq_disk->private_data;
261         u64 len;
262         dma_addr_t dmaaddr;
263         int direction;
264         u16 cmd;
265         struct scatterlist sg;
266
267         BUG_ON(req->nr_phys_segments > 1);
268
269         if (rq_data_dir(req) == READ) {
270                 direction = DMA_FROM_DEVICE;
271                 cmd = viomajorsubtype_cdio | viocdread;
272         } else {
273                 direction = DMA_TO_DEVICE;
274                 cmd = viomajorsubtype_cdio | viocdwrite;
275         }
276
277         sg_init_table(&sg, 1);
278         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
279                 pr_warning("error setting up scatter/gather list\n");
280                 return -1;
281         }
282
283         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
284                 pr_warning("error allocating sg tce\n");
285                 return -1;
286         }
287         dmaaddr = sg_dma_address(&sg);
288         len = sg_dma_len(&sg);
289
290         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
291                         HvLpEvent_Type_VirtualIo, cmd,
292                         HvLpEvent_AckInd_DoAck,
293                         HvLpEvent_AckType_ImmediateAck,
294                         viopath_sourceinst(viopath_hostLp),
295                         viopath_targetinst(viopath_hostLp),
296                         (u64)req, VIOVERSION << 16,
297                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
298                         (u64)blk_rq_pos(req) * 512, len, 0);
299         if (hvrc != HvLpEvent_Rc_Good) {
300                 pr_warning("hv error on op %d\n", (int)hvrc);
301                 return -1;
302         }
303
304         return 0;
305 }
306
307 static int rwreq;
308
309 static void do_viocd_request(struct request_queue *q)
310 {
311         struct request *req;
312
313         while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
314                 if (req->cmd_type != REQ_TYPE_FS)
315                         __blk_end_request_all(req, -EIO);
316                 else if (send_request(req) < 0) {
317                         pr_warning("unable to send message to OS/400!\n");
318                         __blk_end_request_all(req, -EIO);
319                 } else
320                         rwreq++;
321         }
322 }
323
324 static unsigned int viocd_check_events(struct cdrom_device_info *cdi,
325                                        unsigned int clearing, int disc_nr)
326 {
327         struct viocd_waitevent we;
328         HvLpEvent_Rc hvrc;
329         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
330
331         init_completion(&we.com);
332
333         /* Send the open event to OS/400 */
334         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
335                         HvLpEvent_Type_VirtualIo,
336                         viomajorsubtype_cdio | viocdcheck,
337                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
338                         viopath_sourceinst(viopath_hostLp),
339                         viopath_targetinst(viopath_hostLp),
340                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
341                         0, 0, 0);
342         if (hvrc != 0) {
343                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
344                            (int)hvrc);
345                 return 0;
346         }
347
348         wait_for_completion(&we.com);
349
350         /* Check the return code.  If bad, assume no change */
351         if (we.rc) {
352                 const struct vio_error_entry *err =
353                         vio_lookup_rc(viocd_err_table, we.sub_result);
354                 pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
355                            we.rc, we.sub_result, err->msg);
356                 return 0;
357         }
358
359         return we.changed ? DISK_EVENT_MEDIA_CHANGE : 0;
360 }
361
362 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
363 {
364         HvLpEvent_Rc hvrc;
365         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
366         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
367         u64 flags = !!locking;
368         struct viocd_waitevent we;
369
370         init_completion(&we.com);
371
372         /* Send the lockdoor event to OS/400 */
373         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
374                         HvLpEvent_Type_VirtualIo,
375                         viomajorsubtype_cdio | viocdlockdoor,
376                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
377                         viopath_sourceinst(viopath_hostLp),
378                         viopath_targetinst(viopath_hostLp),
379                         (u64)&we, VIOVERSION << 16,
380                         (device_no << 48) | (flags << 32), 0, 0, 0);
381         if (hvrc != 0) {
382                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
383                            (int)hvrc);
384                 return -EIO;
385         }
386
387         wait_for_completion(&we.com);
388
389         if (we.rc != 0)
390                 return -EIO;
391         return 0;
392 }
393
394 static int viocd_packet(struct cdrom_device_info *cdi,
395                 struct packet_command *cgc)
396 {
397         unsigned int buflen = cgc->buflen;
398         int ret = -EIO;
399
400         switch (cgc->cmd[0]) {
401         case GPCMD_READ_DISC_INFO:
402                 {
403                         disc_information *di = (disc_information *)cgc->buffer;
404
405                         if (buflen >= 2) {
406                                 di->disc_information_length = cpu_to_be16(1);
407                                 ret = 0;
408                         }
409                         if (buflen >= 3)
410                                 di->erasable =
411                                         (cdi->ops->capability & ~cdi->mask
412                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
413                 }
414                 break;
415         case GPCMD_GET_CONFIGURATION:
416                 if (cgc->cmd[3] == CDF_RWRT) {
417                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
418
419                         if ((buflen >=
420                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
421                             (cdi->ops->capability & ~cdi->mask
422                              & (CDC_DVD_RAM | CDC_RAM))) {
423                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
424                                 rfd->curr = 1;
425                                 ret = 0;
426                         }
427                 }
428                 break;
429         default:
430                 if (cgc->sense) {
431                         /* indicate Unknown code */
432                         cgc->sense->sense_key = 0x05;
433                         cgc->sense->asc = 0x20;
434                         cgc->sense->ascq = 0x00;
435                 }
436                 break;
437         }
438
439         cgc->stat = ret;
440         return ret;
441 }
442
443 static void restart_all_queues(int first_index)
444 {
445         int i;
446
447         for (i = first_index + 1; i < viocd_numdev; i++)
448                 if (viocd_diskinfo[i].viocd_disk)
449                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
450         for (i = 0; i <= first_index; i++)
451                 if (viocd_diskinfo[i].viocd_disk)
452                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
453 }
454
455 /* This routine handles incoming CD LP events */
456 static void vio_handle_cd_event(struct HvLpEvent *event)
457 {
458         struct viocdlpevent *bevent;
459         struct viocd_waitevent *pwe;
460         struct disk_info *di;
461         unsigned long flags;
462         struct request *req;
463
464
465         if (event == NULL)
466                 /* Notification that a partition went away! */
467                 return;
468         /* First, we should NEVER get an int here...only acks */
469         if (hvlpevent_is_int(event)) {
470                 pr_warning("Yikes! got an int in viocd event handler!\n");
471                 if (hvlpevent_need_ack(event)) {
472                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
473                         HvCallEvent_ackLpEvent(event);
474                 }
475         }
476
477         bevent = (struct viocdlpevent *)event;
478
479         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
480         case viocdopen:
481                 if (event->xRc == 0) {
482                         di = &viocd_diskinfo[bevent->disk];
483                         blk_queue_logical_block_size(di->viocd_disk->queue,
484                                                      bevent->block_size);
485                         set_capacity(di->viocd_disk,
486                                         bevent->media_size *
487                                         bevent->block_size / 512);
488                 }
489                 /* FALLTHROUGH !! */
490         case viocdlockdoor:
491                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
492 return_complete:
493                 pwe->rc = event->xRc;
494                 pwe->sub_result = bevent->sub_result;
495                 complete(&pwe->com);
496                 break;
497
498         case viocdcheck:
499                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
500                 pwe->changed = bevent->flags;
501                 goto return_complete;
502
503         case viocdclose:
504                 break;
505
506         case viocdwrite:
507         case viocdread:
508                 /*
509                  * Since this is running in interrupt mode, we need to
510                  * make sure we're not stepping on any global I/O operations
511                  */
512                 di = &viocd_diskinfo[bevent->disk];
513                 spin_lock_irqsave(&viocd_reqlock, flags);
514                 dma_unmap_single(di->dev, bevent->token, bevent->len,
515                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
516                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
517                 req = (struct request *)bevent->event.xCorrelationToken;
518                 rwreq--;
519
520                 if (event->xRc != HvLpEvent_Rc_Good) {
521                         const struct vio_error_entry *err =
522                                 vio_lookup_rc(viocd_err_table,
523                                                 bevent->sub_result);
524                         pr_warning("request %p failed with rc %d:0x%04X: %s\n",
525                                    req, event->xRc,
526                                    bevent->sub_result, err->msg);
527                         __blk_end_request_all(req, -EIO);
528                 } else
529                         __blk_end_request_all(req, 0);
530
531                 /* restart handling of incoming requests */
532                 spin_unlock_irqrestore(&viocd_reqlock, flags);
533                 restart_all_queues(bevent->disk);
534                 break;
535
536         default:
537                 pr_warning("message with invalid subtype %0x04X!\n",
538                            event->xSubtype & VIOMINOR_SUBTYPE_MASK);
539                 if (hvlpevent_need_ack(event)) {
540                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
541                         HvCallEvent_ackLpEvent(event);
542                 }
543         }
544 }
545
546 static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
547                              void *arg)
548 {
549         return -EINVAL;
550 }
551
552 static struct cdrom_device_ops viocd_dops = {
553         .open = viocd_open,
554         .release = viocd_release,
555         .check_events = viocd_check_events,
556         .lock_door = viocd_lock_door,
557         .generic_packet = viocd_packet,
558         .audio_ioctl = viocd_audio_ioctl,
559         .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
560 };
561
562 static int find_capability(const char *type)
563 {
564         struct capability_entry *entry;
565
566         for(entry = capability_table; entry->type; ++entry)
567                 if(!strncmp(entry->type, type, 4))
568                         break;
569         return entry->capability;
570 }
571
572 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
573 {
574         struct gendisk *gendisk;
575         int deviceno;
576         struct disk_info *d;
577         struct cdrom_device_info *c;
578         struct request_queue *q;
579         struct device_node *node = vdev->dev.of_node;
580
581         deviceno = vdev->unit_address;
582         if (deviceno >= VIOCD_MAX_CD)
583                 return -ENODEV;
584         if (!node)
585                 return -ENODEV;
586
587         if (deviceno >= viocd_numdev)
588                 viocd_numdev = deviceno + 1;
589
590         d = &viocd_diskinfo[deviceno];
591         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
592         d->type = of_get_property(node, "linux,vio_type", NULL);
593         d->model = of_get_property(node, "linux,vio_model", NULL);
594
595         c = &d->viocd_info;
596
597         c->ops = &viocd_dops;
598         c->speed = 4;
599         c->capacity = 1;
600         c->handle = d;
601         c->mask = ~find_capability(d->type);
602         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
603
604         if (register_cdrom(c) != 0) {
605                 pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
606                 goto out;
607         }
608         pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
609                 c->name, d->rsrcname, d->type, d->model);
610         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
611         if (q == NULL) {
612                 pr_warning("Cannot allocate queue for %s!\n", c->name);
613                 goto out_unregister_cdrom;
614         }
615         gendisk = alloc_disk(1);
616         if (gendisk == NULL) {
617                 pr_warning("Cannot create gendisk for %s!\n", c->name);
618                 goto out_cleanup_queue;
619         }
620         gendisk->major = VIOCD_MAJOR;
621         gendisk->first_minor = deviceno;
622         strncpy(gendisk->disk_name, c->name,
623                         sizeof(gendisk->disk_name));
624         blk_queue_max_segments(q, 1);
625         blk_queue_max_hw_sectors(q, 4096 / 512);
626         gendisk->queue = q;
627         gendisk->fops = &viocd_fops;
628         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
629         gendisk->events = DISK_EVENT_MEDIA_CHANGE;
630         set_capacity(gendisk, 0);
631         gendisk->private_data = d;
632         d->viocd_disk = gendisk;
633         d->dev = &vdev->dev;
634         gendisk->driverfs_dev = d->dev;
635         add_disk(gendisk);
636         return 0;
637
638 out_cleanup_queue:
639         blk_cleanup_queue(q);
640 out_unregister_cdrom:
641         unregister_cdrom(c);
642 out:
643         return -ENODEV;
644 }
645
646 static int viocd_remove(struct vio_dev *vdev)
647 {
648         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
649
650         unregister_cdrom(&d->viocd_info);
651         del_gendisk(d->viocd_disk);
652         blk_cleanup_queue(d->viocd_disk->queue);
653         put_disk(d->viocd_disk);
654         return 0;
655 }
656
657 /**
658  * viocd_device_table: Used by vio.c to match devices that we
659  * support.
660  */
661 static struct vio_device_id viocd_device_table[] __devinitdata = {
662         { "block", "IBM,iSeries-viocd" },
663         { "", "" }
664 };
665 MODULE_DEVICE_TABLE(vio, viocd_device_table);
666
667 static struct vio_driver viocd_driver = {
668         .id_table = viocd_device_table,
669         .probe = viocd_probe,
670         .remove = viocd_remove,
671         .driver = {
672                 .name = "viocd",
673                 .owner = THIS_MODULE,
674         }
675 };
676
677 static int __init viocd_init(void)
678 {
679         int ret = 0;
680
681         if (!firmware_has_feature(FW_FEATURE_ISERIES))
682                 return -ENODEV;
683
684         if (viopath_hostLp == HvLpIndexInvalid) {
685                 vio_set_hostlp();
686                 /* If we don't have a host, bail out */
687                 if (viopath_hostLp == HvLpIndexInvalid)
688                         return -ENODEV;
689         }
690
691         pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
692
693         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
694                 pr_warning("Unable to get major %d for %s\n",
695                            VIOCD_MAJOR, VIOCD_DEVICE);
696                 return -EIO;
697         }
698
699         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
700                         MAX_CD_REQ + 2);
701         if (ret) {
702                 pr_warning("error opening path to host partition %d\n",
703                            viopath_hostLp);
704                 goto out_unregister;
705         }
706
707         /* Initialize our request handler */
708         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
709
710         spin_lock_init(&viocd_reqlock);
711
712         ret = vio_register_driver(&viocd_driver);
713         if (ret)
714                 goto out_free_info;
715
716         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
717                     &proc_viocd_operations);
718         return 0;
719
720 out_free_info:
721         vio_clearHandler(viomajorsubtype_cdio);
722         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
723 out_unregister:
724         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
725         return ret;
726 }
727
728 static void __exit viocd_exit(void)
729 {
730         remove_proc_entry("iSeries/viocd", NULL);
731         vio_unregister_driver(&viocd_driver);
732         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
733         vio_clearHandler(viomajorsubtype_cdio);
734         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
735 }
736
737 module_init(viocd_init);
738 module_exit(viocd_exit);
739 MODULE_LICENSE("GPL");