be73a9b493a69970135663ffd4ed7a83cb568cb9
[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 int viocd_blk_media_changed(struct gendisk *disk)
190 {
191         struct disk_info *di = disk->private_data;
192         return cdrom_media_changed(&di->viocd_info);
193 }
194
195 static const struct block_device_operations viocd_fops = {
196         .owner =                THIS_MODULE,
197         .open =                 viocd_blk_open,
198         .release =              viocd_blk_release,
199         .ioctl =                viocd_blk_ioctl,
200         .media_changed =        viocd_blk_media_changed,
201 };
202
203 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
204 {
205         struct disk_info *diskinfo = cdi->handle;
206         int device_no = DEVICE_NR(diskinfo);
207         HvLpEvent_Rc hvrc;
208         struct viocd_waitevent we;
209
210         init_completion(&we.com);
211         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
212                         HvLpEvent_Type_VirtualIo,
213                         viomajorsubtype_cdio | viocdopen,
214                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
215                         viopath_sourceinst(viopath_hostLp),
216                         viopath_targetinst(viopath_hostLp),
217                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
218                         0, 0, 0);
219         if (hvrc != 0) {
220                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
221                            (int)hvrc);
222                 return -EIO;
223         }
224
225         wait_for_completion(&we.com);
226
227         if (we.rc) {
228                 const struct vio_error_entry *err =
229                         vio_lookup_rc(viocd_err_table, we.sub_result);
230                 pr_warning("bad rc %d:0x%04X on open: %s\n",
231                            we.rc, we.sub_result, err->msg);
232                 return -err->errno;
233         }
234
235         return 0;
236 }
237
238 static void viocd_release(struct cdrom_device_info *cdi)
239 {
240         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
241         HvLpEvent_Rc hvrc;
242
243         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
244                         HvLpEvent_Type_VirtualIo,
245                         viomajorsubtype_cdio | viocdclose,
246                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
247                         viopath_sourceinst(viopath_hostLp),
248                         viopath_targetinst(viopath_hostLp), 0,
249                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
250         if (hvrc != 0)
251                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
252                            (int)hvrc);
253 }
254
255 /* Send a read or write request to OS/400 */
256 static int send_request(struct request *req)
257 {
258         HvLpEvent_Rc hvrc;
259         struct disk_info *diskinfo = req->rq_disk->private_data;
260         u64 len;
261         dma_addr_t dmaaddr;
262         int direction;
263         u16 cmd;
264         struct scatterlist sg;
265
266         BUG_ON(req->nr_phys_segments > 1);
267
268         if (rq_data_dir(req) == READ) {
269                 direction = DMA_FROM_DEVICE;
270                 cmd = viomajorsubtype_cdio | viocdread;
271         } else {
272                 direction = DMA_TO_DEVICE;
273                 cmd = viomajorsubtype_cdio | viocdwrite;
274         }
275
276         sg_init_table(&sg, 1);
277         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
278                 pr_warning("error setting up scatter/gather list\n");
279                 return -1;
280         }
281
282         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
283                 pr_warning("error allocating sg tce\n");
284                 return -1;
285         }
286         dmaaddr = sg_dma_address(&sg);
287         len = sg_dma_len(&sg);
288
289         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
290                         HvLpEvent_Type_VirtualIo, cmd,
291                         HvLpEvent_AckInd_DoAck,
292                         HvLpEvent_AckType_ImmediateAck,
293                         viopath_sourceinst(viopath_hostLp),
294                         viopath_targetinst(viopath_hostLp),
295                         (u64)req, VIOVERSION << 16,
296                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
297                         (u64)blk_rq_pos(req) * 512, len, 0);
298         if (hvrc != HvLpEvent_Rc_Good) {
299                 pr_warning("hv error on op %d\n", (int)hvrc);
300                 return -1;
301         }
302
303         return 0;
304 }
305
306 static int rwreq;
307
308 static void do_viocd_request(struct request_queue *q)
309 {
310         struct request *req;
311
312         while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
313                 if (req->cmd_type != REQ_TYPE_FS)
314                         __blk_end_request_all(req, -EIO);
315                 else if (send_request(req) < 0) {
316                         pr_warning("unable to send message to OS/400!\n");
317                         __blk_end_request_all(req, -EIO);
318                 } else
319                         rwreq++;
320         }
321 }
322
323 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
324 {
325         struct viocd_waitevent we;
326         HvLpEvent_Rc hvrc;
327         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
328
329         init_completion(&we.com);
330
331         /* Send the open event to OS/400 */
332         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
333                         HvLpEvent_Type_VirtualIo,
334                         viomajorsubtype_cdio | viocdcheck,
335                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
336                         viopath_sourceinst(viopath_hostLp),
337                         viopath_targetinst(viopath_hostLp),
338                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
339                         0, 0, 0);
340         if (hvrc != 0) {
341                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
342                            (int)hvrc);
343                 return -EIO;
344         }
345
346         wait_for_completion(&we.com);
347
348         /* Check the return code.  If bad, assume no change */
349         if (we.rc) {
350                 const struct vio_error_entry *err =
351                         vio_lookup_rc(viocd_err_table, we.sub_result);
352                 pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
353                            we.rc, we.sub_result, err->msg);
354                 return 0;
355         }
356
357         return we.changed;
358 }
359
360 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
361 {
362         HvLpEvent_Rc hvrc;
363         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
364         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
365         u64 flags = !!locking;
366         struct viocd_waitevent we;
367
368         init_completion(&we.com);
369
370         /* Send the lockdoor event to OS/400 */
371         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
372                         HvLpEvent_Type_VirtualIo,
373                         viomajorsubtype_cdio | viocdlockdoor,
374                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
375                         viopath_sourceinst(viopath_hostLp),
376                         viopath_targetinst(viopath_hostLp),
377                         (u64)&we, VIOVERSION << 16,
378                         (device_no << 48) | (flags << 32), 0, 0, 0);
379         if (hvrc != 0) {
380                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
381                            (int)hvrc);
382                 return -EIO;
383         }
384
385         wait_for_completion(&we.com);
386
387         if (we.rc != 0)
388                 return -EIO;
389         return 0;
390 }
391
392 static int viocd_packet(struct cdrom_device_info *cdi,
393                 struct packet_command *cgc)
394 {
395         unsigned int buflen = cgc->buflen;
396         int ret = -EIO;
397
398         switch (cgc->cmd[0]) {
399         case GPCMD_READ_DISC_INFO:
400                 {
401                         disc_information *di = (disc_information *)cgc->buffer;
402
403                         if (buflen >= 2) {
404                                 di->disc_information_length = cpu_to_be16(1);
405                                 ret = 0;
406                         }
407                         if (buflen >= 3)
408                                 di->erasable =
409                                         (cdi->ops->capability & ~cdi->mask
410                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
411                 }
412                 break;
413         case GPCMD_GET_CONFIGURATION:
414                 if (cgc->cmd[3] == CDF_RWRT) {
415                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
416
417                         if ((buflen >=
418                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
419                             (cdi->ops->capability & ~cdi->mask
420                              & (CDC_DVD_RAM | CDC_RAM))) {
421                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
422                                 rfd->curr = 1;
423                                 ret = 0;
424                         }
425                 }
426                 break;
427         default:
428                 if (cgc->sense) {
429                         /* indicate Unknown code */
430                         cgc->sense->sense_key = 0x05;
431                         cgc->sense->asc = 0x20;
432                         cgc->sense->ascq = 0x00;
433                 }
434                 break;
435         }
436
437         cgc->stat = ret;
438         return ret;
439 }
440
441 static void restart_all_queues(int first_index)
442 {
443         int i;
444
445         for (i = first_index + 1; i < viocd_numdev; i++)
446                 if (viocd_diskinfo[i].viocd_disk)
447                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
448         for (i = 0; i <= first_index; i++)
449                 if (viocd_diskinfo[i].viocd_disk)
450                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
451 }
452
453 /* This routine handles incoming CD LP events */
454 static void vio_handle_cd_event(struct HvLpEvent *event)
455 {
456         struct viocdlpevent *bevent;
457         struct viocd_waitevent *pwe;
458         struct disk_info *di;
459         unsigned long flags;
460         struct request *req;
461
462
463         if (event == NULL)
464                 /* Notification that a partition went away! */
465                 return;
466         /* First, we should NEVER get an int here...only acks */
467         if (hvlpevent_is_int(event)) {
468                 pr_warning("Yikes! got an int in viocd event handler!\n");
469                 if (hvlpevent_need_ack(event)) {
470                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
471                         HvCallEvent_ackLpEvent(event);
472                 }
473         }
474
475         bevent = (struct viocdlpevent *)event;
476
477         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
478         case viocdopen:
479                 if (event->xRc == 0) {
480                         di = &viocd_diskinfo[bevent->disk];
481                         blk_queue_logical_block_size(di->viocd_disk->queue,
482                                                      bevent->block_size);
483                         set_capacity(di->viocd_disk,
484                                         bevent->media_size *
485                                         bevent->block_size / 512);
486                 }
487                 /* FALLTHROUGH !! */
488         case viocdlockdoor:
489                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
490 return_complete:
491                 pwe->rc = event->xRc;
492                 pwe->sub_result = bevent->sub_result;
493                 complete(&pwe->com);
494                 break;
495
496         case viocdcheck:
497                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
498                 pwe->changed = bevent->flags;
499                 goto return_complete;
500
501         case viocdclose:
502                 break;
503
504         case viocdwrite:
505         case viocdread:
506                 /*
507                  * Since this is running in interrupt mode, we need to
508                  * make sure we're not stepping on any global I/O operations
509                  */
510                 di = &viocd_diskinfo[bevent->disk];
511                 spin_lock_irqsave(&viocd_reqlock, flags);
512                 dma_unmap_single(di->dev, bevent->token, bevent->len,
513                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
514                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
515                 req = (struct request *)bevent->event.xCorrelationToken;
516                 rwreq--;
517
518                 if (event->xRc != HvLpEvent_Rc_Good) {
519                         const struct vio_error_entry *err =
520                                 vio_lookup_rc(viocd_err_table,
521                                                 bevent->sub_result);
522                         pr_warning("request %p failed with rc %d:0x%04X: %s\n",
523                                    req, event->xRc,
524                                    bevent->sub_result, err->msg);
525                         __blk_end_request_all(req, -EIO);
526                 } else
527                         __blk_end_request_all(req, 0);
528
529                 /* restart handling of incoming requests */
530                 spin_unlock_irqrestore(&viocd_reqlock, flags);
531                 restart_all_queues(bevent->disk);
532                 break;
533
534         default:
535                 pr_warning("message with invalid subtype %0x04X!\n",
536                            event->xSubtype & VIOMINOR_SUBTYPE_MASK);
537                 if (hvlpevent_need_ack(event)) {
538                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
539                         HvCallEvent_ackLpEvent(event);
540                 }
541         }
542 }
543
544 static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
545                              void *arg)
546 {
547         return -EINVAL;
548 }
549
550 static struct cdrom_device_ops viocd_dops = {
551         .open = viocd_open,
552         .release = viocd_release,
553         .media_changed = viocd_media_changed,
554         .lock_door = viocd_lock_door,
555         .generic_packet = viocd_packet,
556         .audio_ioctl = viocd_audio_ioctl,
557         .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
558 };
559
560 static int find_capability(const char *type)
561 {
562         struct capability_entry *entry;
563
564         for(entry = capability_table; entry->type; ++entry)
565                 if(!strncmp(entry->type, type, 4))
566                         break;
567         return entry->capability;
568 }
569
570 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
571 {
572         struct gendisk *gendisk;
573         int deviceno;
574         struct disk_info *d;
575         struct cdrom_device_info *c;
576         struct request_queue *q;
577         struct device_node *node = vdev->dev.of_node;
578
579         deviceno = vdev->unit_address;
580         if (deviceno >= VIOCD_MAX_CD)
581                 return -ENODEV;
582         if (!node)
583                 return -ENODEV;
584
585         if (deviceno >= viocd_numdev)
586                 viocd_numdev = deviceno + 1;
587
588         d = &viocd_diskinfo[deviceno];
589         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
590         d->type = of_get_property(node, "linux,vio_type", NULL);
591         d->model = of_get_property(node, "linux,vio_model", NULL);
592
593         c = &d->viocd_info;
594
595         c->ops = &viocd_dops;
596         c->speed = 4;
597         c->capacity = 1;
598         c->handle = d;
599         c->mask = ~find_capability(d->type);
600         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
601
602         if (register_cdrom(c) != 0) {
603                 pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
604                 goto out;
605         }
606         pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
607                 c->name, d->rsrcname, d->type, d->model);
608         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
609         if (q == NULL) {
610                 pr_warning("Cannot allocate queue for %s!\n", c->name);
611                 goto out_unregister_cdrom;
612         }
613         gendisk = alloc_disk(1);
614         if (gendisk == NULL) {
615                 pr_warning("Cannot create gendisk for %s!\n", c->name);
616                 goto out_cleanup_queue;
617         }
618         gendisk->major = VIOCD_MAJOR;
619         gendisk->first_minor = deviceno;
620         strncpy(gendisk->disk_name, c->name,
621                         sizeof(gendisk->disk_name));
622         blk_queue_max_segments(q, 1);
623         blk_queue_max_hw_sectors(q, 4096 / 512);
624         gendisk->queue = q;
625         gendisk->fops = &viocd_fops;
626         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
627         set_capacity(gendisk, 0);
628         gendisk->private_data = d;
629         d->viocd_disk = gendisk;
630         d->dev = &vdev->dev;
631         gendisk->driverfs_dev = d->dev;
632         add_disk(gendisk);
633         return 0;
634
635 out_cleanup_queue:
636         blk_cleanup_queue(q);
637 out_unregister_cdrom:
638         unregister_cdrom(c);
639 out:
640         return -ENODEV;
641 }
642
643 static int viocd_remove(struct vio_dev *vdev)
644 {
645         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
646
647         unregister_cdrom(&d->viocd_info);
648         del_gendisk(d->viocd_disk);
649         blk_cleanup_queue(d->viocd_disk->queue);
650         put_disk(d->viocd_disk);
651         return 0;
652 }
653
654 /**
655  * viocd_device_table: Used by vio.c to match devices that we
656  * support.
657  */
658 static struct vio_device_id viocd_device_table[] __devinitdata = {
659         { "block", "IBM,iSeries-viocd" },
660         { "", "" }
661 };
662 MODULE_DEVICE_TABLE(vio, viocd_device_table);
663
664 static struct vio_driver viocd_driver = {
665         .id_table = viocd_device_table,
666         .probe = viocd_probe,
667         .remove = viocd_remove,
668         .driver = {
669                 .name = "viocd",
670                 .owner = THIS_MODULE,
671         }
672 };
673
674 static int __init viocd_init(void)
675 {
676         int ret = 0;
677
678         if (!firmware_has_feature(FW_FEATURE_ISERIES))
679                 return -ENODEV;
680
681         if (viopath_hostLp == HvLpIndexInvalid) {
682                 vio_set_hostlp();
683                 /* If we don't have a host, bail out */
684                 if (viopath_hostLp == HvLpIndexInvalid)
685                         return -ENODEV;
686         }
687
688         pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
689
690         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
691                 pr_warning("Unable to get major %d for %s\n",
692                            VIOCD_MAJOR, VIOCD_DEVICE);
693                 return -EIO;
694         }
695
696         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
697                         MAX_CD_REQ + 2);
698         if (ret) {
699                 pr_warning("error opening path to host partition %d\n",
700                            viopath_hostLp);
701                 goto out_unregister;
702         }
703
704         /* Initialize our request handler */
705         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
706
707         spin_lock_init(&viocd_reqlock);
708
709         ret = vio_register_driver(&viocd_driver);
710         if (ret)
711                 goto out_free_info;
712
713         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
714                     &proc_viocd_operations);
715         return 0;
716
717 out_free_info:
718         vio_clearHandler(viomajorsubtype_cdio);
719         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
720 out_unregister:
721         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
722         return ret;
723 }
724
725 static void __exit viocd_exit(void)
726 {
727         remove_proc_entry("iSeries/viocd", NULL);
728         vio_unregister_driver(&viocd_driver);
729         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
730         vio_clearHandler(viomajorsubtype_cdio);
731         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
732 }
733
734 module_init(viocd_init);
735 module_exit(viocd_exit);
736 MODULE_LICENSE("GPL");