[PATCH] kill cdrom ->dev_ioctl method
[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 <sfr@au1.ibm.com>
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
45 #include <asm/vio.h>
46 #include <asm/scatterlist.h>
47 #include <asm/iseries/hv_types.h>
48 #include <asm/iseries/hv_lp_event.h>
49 #include <asm/iseries/vio.h>
50
51 #define VIOCD_DEVICE                    "iseries/vcd"
52 #define VIOCD_DEVICE_DEVFS              "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 struct viocdlpevent {
60         struct HvLpEvent        event;
61         u32                     reserved;
62         u16                     version;
63         u16                     sub_result;
64         u16                     disk;
65         u16                     flags;
66         u32                     token;
67         u64                     offset;         /* On open, max number of disks */
68         u64                     len;            /* On open, size of the disk */
69         u32                     block_size;     /* Only set on open */
70         u32                     media_size;     /* Only set on open */
71 };
72
73 enum viocdsubtype {
74         viocdopen = 0x0001,
75         viocdclose = 0x0002,
76         viocdread = 0x0003,
77         viocdwrite = 0x0004,
78         viocdlockdoor = 0x0005,
79         viocdgetinfo = 0x0006,
80         viocdcheck = 0x0007
81 };
82
83 /*
84  * Should probably make this a module parameter....sigh
85  */
86 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
87
88 static const struct vio_error_entry viocd_err_table[] = {
89         {0x0201, EINVAL, "Invalid Range"},
90         {0x0202, EINVAL, "Invalid Token"},
91         {0x0203, EIO, "DMA Error"},
92         {0x0204, EIO, "Use Error"},
93         {0x0205, EIO, "Release Error"},
94         {0x0206, EINVAL, "Invalid CD"},
95         {0x020C, EROFS, "Read Only Device"},
96         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
97         {0x020E, EIO, "Optical System Error (Varied Off?)"},
98         {0x02FF, EIO, "Internal Error"},
99         {0x3010, EIO, "Changed Volume"},
100         {0xC100, EIO, "Optical System Error"},
101         {0x0000, 0, NULL},
102 };
103
104 /*
105  * This is the structure we use to exchange info between driver and interrupt
106  * handler
107  */
108 struct viocd_waitevent {
109         struct completion       com;
110         int                     rc;
111         u16                     sub_result;
112         int                     changed;
113 };
114
115 /* this is a lookup table for the true capabilities of a device */
116 struct capability_entry {
117         char    *type;
118         int     capability;
119 };
120
121 static struct capability_entry capability_table[] __initdata = {
122         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
123         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
124         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
125         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
126         { "6321", CDC_LOCK },
127         { "632B", 0 },
128         { NULL  , CDC_LOCK },
129 };
130
131 /* These are our internal structures for keeping track of devices */
132 static int viocd_numdev;
133
134 struct cdrom_info {
135         char    rsrcname[10];
136         char    type[4];
137         char    model[3];
138 };
139 /*
140  * This needs to be allocated since it is passed to the
141  * Hypervisor and we may be a module.
142  */
143 static struct cdrom_info *viocd_unitinfo;
144 static dma_addr_t unitinfo_dmaaddr;
145
146 struct disk_info {
147         struct gendisk                  *viocd_disk;
148         struct cdrom_device_info        viocd_info;
149         struct device                   *dev;
150 };
151 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
152
153 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
154
155 static spinlock_t viocd_reqlock;
156
157 #define MAX_CD_REQ      1
158
159 /* procfs support */
160 static int proc_viocd_show(struct seq_file *m, void *v)
161 {
162         int i;
163
164         for (i = 0; i < viocd_numdev; i++) {
165                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
166                                 "type %4.4s, model %3.3s\n",
167                                 i, viocd_unitinfo[i].rsrcname,
168                                 viocd_unitinfo[i].type,
169                                 viocd_unitinfo[i].model);
170         }
171         return 0;
172 }
173
174 static int proc_viocd_open(struct inode *inode, struct file *file)
175 {
176         return single_open(file, proc_viocd_show, NULL);
177 }
178
179 static struct file_operations proc_viocd_operations = {
180         .open           = proc_viocd_open,
181         .read           = seq_read,
182         .llseek         = seq_lseek,
183         .release        = single_release,
184 };
185
186 static int viocd_blk_open(struct inode *inode, struct file *file)
187 {
188         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
189         return cdrom_open(&di->viocd_info, inode, file);
190 }
191
192 static int viocd_blk_release(struct inode *inode, struct file *file)
193 {
194         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
195         return cdrom_release(&di->viocd_info, file);
196 }
197
198 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
199                 unsigned cmd, unsigned long arg)
200 {
201         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
202         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
203 }
204
205 static int viocd_blk_media_changed(struct gendisk *disk)
206 {
207         struct disk_info *di = disk->private_data;
208         return cdrom_media_changed(&di->viocd_info);
209 }
210
211 struct block_device_operations viocd_fops = {
212         .owner =                THIS_MODULE,
213         .open =                 viocd_blk_open,
214         .release =              viocd_blk_release,
215         .ioctl =                viocd_blk_ioctl,
216         .media_changed =        viocd_blk_media_changed,
217 };
218
219 /* Get info on CD devices from OS/400 */
220 static void __init get_viocd_info(void)
221 {
222         HvLpEvent_Rc hvrc;
223         int i;
224         struct viocd_waitevent we;
225
226         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
227                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
228                         &unitinfo_dmaaddr, GFP_ATOMIC);
229         if (viocd_unitinfo == NULL) {
230                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
231                 return;
232         }
233
234         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
235
236         init_completion(&we.com);
237
238         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
239                         HvLpEvent_Type_VirtualIo,
240                         viomajorsubtype_cdio | viocdgetinfo,
241                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
242                         viopath_sourceinst(viopath_hostLp),
243                         viopath_targetinst(viopath_hostLp),
244                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
245                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
246         if (hvrc != HvLpEvent_Rc_Good) {
247                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
248                                 (int)hvrc);
249                 goto error_ret;
250         }
251
252         wait_for_completion(&we.com);
253
254         if (we.rc) {
255                 const struct vio_error_entry *err =
256                         vio_lookup_rc(viocd_err_table, we.sub_result);
257                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
258                                 we.rc, we.sub_result, err->msg);
259                 goto error_ret;
260         }
261
262         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
263                 viocd_numdev++;
264
265 error_ret:
266         if (viocd_numdev == 0) {
267                 dma_free_coherent(iSeries_vio_dev,
268                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
269                                 viocd_unitinfo, unitinfo_dmaaddr);
270                 viocd_unitinfo = NULL;
271         }
272 }
273
274 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
275 {
276         struct disk_info *diskinfo = cdi->handle;
277         int device_no = DEVICE_NR(diskinfo);
278         HvLpEvent_Rc hvrc;
279         struct viocd_waitevent we;
280
281         init_completion(&we.com);
282         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
283                         HvLpEvent_Type_VirtualIo,
284                         viomajorsubtype_cdio | viocdopen,
285                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
286                         viopath_sourceinst(viopath_hostLp),
287                         viopath_targetinst(viopath_hostLp),
288                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
289                         0, 0, 0);
290         if (hvrc != 0) {
291                 printk(VIOCD_KERN_WARNING
292                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
293                                 (int)hvrc);
294                 return -EIO;
295         }
296
297         wait_for_completion(&we.com);
298
299         if (we.rc) {
300                 const struct vio_error_entry *err =
301                         vio_lookup_rc(viocd_err_table, we.sub_result);
302                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
303                                 we.rc, we.sub_result, err->msg);
304                 return -err->errno;
305         }
306
307         return 0;
308 }
309
310 static void viocd_release(struct cdrom_device_info *cdi)
311 {
312         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
313         HvLpEvent_Rc hvrc;
314
315         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
316                         HvLpEvent_Type_VirtualIo,
317                         viomajorsubtype_cdio | viocdclose,
318                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
319                         viopath_sourceinst(viopath_hostLp),
320                         viopath_targetinst(viopath_hostLp), 0,
321                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
322         if (hvrc != 0)
323                 printk(VIOCD_KERN_WARNING
324                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
325                                 (int)hvrc);
326 }
327
328 /* Send a read or write request to OS/400 */
329 static int send_request(struct request *req)
330 {
331         HvLpEvent_Rc hvrc;
332         struct disk_info *diskinfo = req->rq_disk->private_data;
333         u64 len;
334         dma_addr_t dmaaddr;
335         int direction;
336         u16 cmd;
337         struct scatterlist sg;
338
339         BUG_ON(req->nr_phys_segments > 1);
340
341         if (rq_data_dir(req) == READ) {
342                 direction = DMA_FROM_DEVICE;
343                 cmd = viomajorsubtype_cdio | viocdread;
344         } else {
345                 direction = DMA_TO_DEVICE;
346                 cmd = viomajorsubtype_cdio | viocdwrite;
347         }
348
349         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
350                 printk(VIOCD_KERN_WARNING
351                                 "error setting up scatter/gather list\n");
352                 return -1;
353         }
354
355         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
356                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
357                 return -1;
358         }
359         dmaaddr = sg_dma_address(&sg);
360         len = sg_dma_len(&sg);
361
362         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
363                         HvLpEvent_Type_VirtualIo, cmd,
364                         HvLpEvent_AckInd_DoAck,
365                         HvLpEvent_AckType_ImmediateAck,
366                         viopath_sourceinst(viopath_hostLp),
367                         viopath_targetinst(viopath_hostLp),
368                         (u64)req, VIOVERSION << 16,
369                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
370                         (u64)req->sector * 512, len, 0);
371         if (hvrc != HvLpEvent_Rc_Good) {
372                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
373                 return -1;
374         }
375
376         return 0;
377 }
378
379
380 static int rwreq;
381
382 static void do_viocd_request(request_queue_t *q)
383 {
384         struct request *req;
385
386         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
387                 if (!blk_fs_request(req))
388                         end_request(req, 0);
389                 else if (send_request(req) < 0) {
390                         printk(VIOCD_KERN_WARNING
391                                         "unable to send message to OS/400!");
392                         end_request(req, 0);
393                 } else
394                         rwreq++;
395         }
396 }
397
398 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
399 {
400         struct viocd_waitevent we;
401         HvLpEvent_Rc hvrc;
402         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
403
404         init_completion(&we.com);
405
406         /* Send the open event to OS/400 */
407         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
408                         HvLpEvent_Type_VirtualIo,
409                         viomajorsubtype_cdio | viocdcheck,
410                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
411                         viopath_sourceinst(viopath_hostLp),
412                         viopath_targetinst(viopath_hostLp),
413                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
414                         0, 0, 0);
415         if (hvrc != 0) {
416                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
417                                 (int)hvrc);
418                 return -EIO;
419         }
420
421         wait_for_completion(&we.com);
422
423         /* Check the return code.  If bad, assume no change */
424         if (we.rc) {
425                 const struct vio_error_entry *err =
426                         vio_lookup_rc(viocd_err_table, we.sub_result);
427                 printk(VIOCD_KERN_WARNING
428                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
429                                 we.rc, we.sub_result, err->msg);
430                 return 0;
431         }
432
433         return we.changed;
434 }
435
436 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
437 {
438         HvLpEvent_Rc hvrc;
439         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
440         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
441         u64 flags = !!locking;
442         struct viocd_waitevent we;
443
444         init_completion(&we.com);
445
446         /* Send the lockdoor event to OS/400 */
447         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
448                         HvLpEvent_Type_VirtualIo,
449                         viomajorsubtype_cdio | viocdlockdoor,
450                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
451                         viopath_sourceinst(viopath_hostLp),
452                         viopath_targetinst(viopath_hostLp),
453                         (u64)&we, VIOVERSION << 16,
454                         (device_no << 48) | (flags << 32), 0, 0, 0);
455         if (hvrc != 0) {
456                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
457                                 (int)hvrc);
458                 return -EIO;
459         }
460
461         wait_for_completion(&we.com);
462
463         if (we.rc != 0)
464                 return -EIO;
465         return 0;
466 }
467
468 static int viocd_packet(struct cdrom_device_info *cdi,
469                 struct packet_command *cgc)
470 {
471         unsigned int buflen = cgc->buflen;
472         int ret = -EIO;
473
474         switch (cgc->cmd[0]) {
475         case GPCMD_READ_DISC_INFO:
476                 {
477                         disc_information *di = (disc_information *)cgc->buffer;
478
479                         if (buflen >= 2) {
480                                 di->disc_information_length = cpu_to_be16(1);
481                                 ret = 0;
482                         }
483                         if (buflen >= 3)
484                                 di->erasable =
485                                         (cdi->ops->capability & ~cdi->mask
486                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
487                 }
488                 break;
489         case GPCMD_GET_CONFIGURATION:
490                 if (cgc->cmd[3] == CDF_RWRT) {
491                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
492
493                         if ((buflen >=
494                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
495                             (cdi->ops->capability & ~cdi->mask
496                              & (CDC_DVD_RAM | CDC_RAM))) {
497                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
498                                 rfd->curr = 1;
499                                 ret = 0;
500                         }
501                 }
502                 break;
503         default:
504                 if (cgc->sense) {
505                         /* indicate Unknown code */
506                         cgc->sense->sense_key = 0x05;
507                         cgc->sense->asc = 0x20;
508                         cgc->sense->ascq = 0x00;
509                 }
510                 break;
511         }
512
513         cgc->stat = ret;
514         return ret;
515 }
516
517 static void restart_all_queues(int first_index)
518 {
519         int i;
520
521         for (i = first_index + 1; i < viocd_numdev; i++)
522                 if (viocd_diskinfo[i].viocd_disk)
523                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
524         for (i = 0; i <= first_index; i++)
525                 if (viocd_diskinfo[i].viocd_disk)
526                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
527 }
528
529 /* This routine handles incoming CD LP events */
530 static void vio_handle_cd_event(struct HvLpEvent *event)
531 {
532         struct viocdlpevent *bevent;
533         struct viocd_waitevent *pwe;
534         struct disk_info *di;
535         unsigned long flags;
536         struct request *req;
537
538
539         if (event == NULL)
540                 /* Notification that a partition went away! */
541                 return;
542         /* First, we should NEVER get an int here...only acks */
543         if (hvlpevent_is_int(event)) {
544                 printk(VIOCD_KERN_WARNING
545                                 "Yikes! got an int in viocd event handler!\n");
546                 if (hvlpevent_need_ack(event)) {
547                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
548                         HvCallEvent_ackLpEvent(event);
549                 }
550         }
551
552         bevent = (struct viocdlpevent *)event;
553
554         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
555         case viocdopen:
556                 if (event->xRc == 0) {
557                         di = &viocd_diskinfo[bevent->disk];
558                         blk_queue_hardsect_size(di->viocd_disk->queue,
559                                         bevent->block_size);
560                         set_capacity(di->viocd_disk,
561                                         bevent->media_size *
562                                         bevent->block_size / 512);
563                 }
564                 /* FALLTHROUGH !! */
565         case viocdgetinfo:
566         case viocdlockdoor:
567                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
568 return_complete:
569                 pwe->rc = event->xRc;
570                 pwe->sub_result = bevent->sub_result;
571                 complete(&pwe->com);
572                 break;
573
574         case viocdcheck:
575                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
576                 pwe->changed = bevent->flags;
577                 goto return_complete;
578
579         case viocdclose:
580                 break;
581
582         case viocdwrite:
583         case viocdread:
584                 /*
585                  * Since this is running in interrupt mode, we need to
586                  * make sure we're not stepping on any global I/O operations
587                  */
588                 di = &viocd_diskinfo[bevent->disk];
589                 spin_lock_irqsave(&viocd_reqlock, flags);
590                 dma_unmap_single(di->dev, bevent->token, bevent->len,
591                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
592                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
593                 req = (struct request *)bevent->event.xCorrelationToken;
594                 rwreq--;
595
596                 if (event->xRc != HvLpEvent_Rc_Good) {
597                         const struct vio_error_entry *err =
598                                 vio_lookup_rc(viocd_err_table,
599                                                 bevent->sub_result);
600                         printk(VIOCD_KERN_WARNING "request %p failed "
601                                         "with rc %d:0x%04X: %s\n",
602                                         req, event->xRc,
603                                         bevent->sub_result, err->msg);
604                         end_request(req, 0);
605                 } else
606                         end_request(req, 1);
607
608                 /* restart handling of incoming requests */
609                 spin_unlock_irqrestore(&viocd_reqlock, flags);
610                 restart_all_queues(bevent->disk);
611                 break;
612
613         default:
614                 printk(VIOCD_KERN_WARNING
615                                 "message with invalid subtype %0x04X!\n",
616                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
617                 if (hvlpevent_need_ack(event)) {
618                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
619                         HvCallEvent_ackLpEvent(event);
620                 }
621         }
622 }
623
624 static struct cdrom_device_ops viocd_dops = {
625         .open = viocd_open,
626         .release = viocd_release,
627         .media_changed = viocd_media_changed,
628         .lock_door = viocd_lock_door,
629         .generic_packet = viocd_packet,
630         .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
631 };
632
633 static int __init find_capability(const char *type)
634 {
635         struct capability_entry *entry;
636
637         for(entry = capability_table; entry->type; ++entry)
638                 if(!strncmp(entry->type, type, 4))
639                         break;
640         return entry->capability;
641 }
642
643 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
644 {
645         struct gendisk *gendisk;
646         int deviceno;
647         struct disk_info *d;
648         struct cdrom_device_info *c;
649         struct cdrom_info *ci;
650         struct request_queue *q;
651
652         deviceno = vdev->unit_address;
653         if (deviceno >= viocd_numdev)
654                 return -ENODEV;
655
656         d = &viocd_diskinfo[deviceno];
657         c = &d->viocd_info;
658         ci = &viocd_unitinfo[deviceno];
659
660         c->ops = &viocd_dops;
661         c->speed = 4;
662         c->capacity = 1;
663         c->handle = d;
664         c->mask = ~find_capability(ci->type);
665         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
666
667         if (register_cdrom(c) != 0) {
668                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
669                                 c->name);
670                 goto out;
671         }
672         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
673                         "type %4.4s, model %3.3s\n",
674                         c->name, ci->rsrcname, ci->type, ci->model);
675         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
676         if (q == NULL) {
677                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
678                                 c->name);
679                 goto out_unregister_cdrom;
680         }
681         gendisk = alloc_disk(1);
682         if (gendisk == NULL) {
683                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
684                                 c->name);
685                 goto out_cleanup_queue;
686         }
687         gendisk->major = VIOCD_MAJOR;
688         gendisk->first_minor = deviceno;
689         strncpy(gendisk->disk_name, c->name,
690                         sizeof(gendisk->disk_name));
691         snprintf(gendisk->devfs_name, sizeof(gendisk->devfs_name),
692                         VIOCD_DEVICE_DEVFS "%d", deviceno);
693         blk_queue_max_hw_segments(q, 1);
694         blk_queue_max_phys_segments(q, 1);
695         blk_queue_max_sectors(q, 4096 / 512);
696         gendisk->queue = q;
697         gendisk->fops = &viocd_fops;
698         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
699         set_capacity(gendisk, 0);
700         gendisk->private_data = d;
701         d->viocd_disk = gendisk;
702         d->dev = &vdev->dev;
703         gendisk->driverfs_dev = d->dev;
704         add_disk(gendisk);
705         return 0;
706
707 out_cleanup_queue:
708         blk_cleanup_queue(q);
709 out_unregister_cdrom:
710         unregister_cdrom(c);
711 out:
712         return -ENODEV;
713 }
714
715 static int viocd_remove(struct vio_dev *vdev)
716 {
717         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
718
719         if (unregister_cdrom(&d->viocd_info) != 0)
720                 printk(VIOCD_KERN_WARNING
721                                 "Cannot unregister viocd CD-ROM %s!\n",
722                                 d->viocd_info.name);
723         del_gendisk(d->viocd_disk);
724         blk_cleanup_queue(d->viocd_disk->queue);
725         put_disk(d->viocd_disk);
726         return 0;
727 }
728
729 /**
730  * viocd_device_table: Used by vio.c to match devices that we
731  * support.
732  */
733 static struct vio_device_id viocd_device_table[] __devinitdata = {
734         { "viocd", "" },
735         { "", "" }
736 };
737 MODULE_DEVICE_TABLE(vio, viocd_device_table);
738
739 static struct vio_driver viocd_driver = {
740         .id_table = viocd_device_table,
741         .probe = viocd_probe,
742         .remove = viocd_remove,
743         .driver = {
744                 .name = "viocd",
745                 .owner = THIS_MODULE,
746         }
747 };
748
749 static int __init viocd_init(void)
750 {
751         struct proc_dir_entry *e;
752         int ret = 0;
753
754         if (viopath_hostLp == HvLpIndexInvalid) {
755                 vio_set_hostlp();
756                 /* If we don't have a host, bail out */
757                 if (viopath_hostLp == HvLpIndexInvalid)
758                         return -ENODEV;
759         }
760
761         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
762                         viopath_hostLp);
763
764         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
765                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
766                                 VIOCD_MAJOR, VIOCD_DEVICE);
767                 return -EIO;
768         }
769
770         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
771                         MAX_CD_REQ + 2);
772         if (ret) {
773                 printk(VIOCD_KERN_WARNING
774                                 "error opening path to host partition %d\n",
775                                 viopath_hostLp);
776                 goto out_unregister;
777         }
778
779         /* Initialize our request handler */
780         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
781
782         get_viocd_info();
783
784         spin_lock_init(&viocd_reqlock);
785
786         ret = vio_register_driver(&viocd_driver);
787         if (ret)
788                 goto out_free_info;
789
790         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
791         if (e) {
792                 e->owner = THIS_MODULE;
793                 e->proc_fops = &proc_viocd_operations;
794         }
795
796         return 0;
797
798 out_free_info:
799         dma_free_coherent(iSeries_vio_dev,
800                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
801                         viocd_unitinfo, unitinfo_dmaaddr);
802         vio_clearHandler(viomajorsubtype_cdio);
803         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
804 out_unregister:
805         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
806         return ret;
807 }
808
809 static void __exit viocd_exit(void)
810 {
811         remove_proc_entry("iSeries/viocd", NULL);
812         vio_unregister_driver(&viocd_driver);
813         if (viocd_unitinfo != NULL)
814                 dma_free_coherent(iSeries_vio_dev,
815                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
816                                 viocd_unitinfo, unitinfo_dmaaddr);
817         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
818         vio_clearHandler(viomajorsubtype_cdio);
819         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
820 }
821
822 module_init(viocd_init);
823 module_exit(viocd_exit);
824 MODULE_LICENSE("GPL");