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[PATCH] remove bogus asm/bug.h includes.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / cdrom / viocd.c
blobe276172595528282fd07467ea5cc360dd9ac7fd6
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_IOCTLS | 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");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree