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V4L/DVB (6115): ivtv/ivtv-fb: improve locking to avoid initialization problems
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / cdrom / viocd.c
blobe51550db1575acf758ba313bc207f72658547afa
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 #include <asm/firmware.h>
51
52 #define VIOCD_DEVICE "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 const 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 static void viocd_end_request(struct request *req, int uptodate)
380 {
381 int nsectors = req->hard_nr_sectors;
382
383 /*
384 * Make sure it's fully ended, and ensure that we process
385 * at least one sector.
386 */
387 if (blk_pc_request(req))
388 nsectors = (req->data_len + 511) >> 9;
389 if (!nsectors)
390 nsectors = 1;
391
392 if (end_that_request_first(req, uptodate, nsectors))
393 BUG();
394 add_disk_randomness(req->rq_disk);
395 blkdev_dequeue_request(req);
396 end_that_request_last(req, uptodate);
397 }
398
399 static int rwreq;
400
401 static void do_viocd_request(struct request_queue *q)
402 {
403 struct request *req;
404
405 while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
406 if (!blk_fs_request(req))
407 viocd_end_request(req, 0);
408 else if (send_request(req) < 0) {
409 printk(VIOCD_KERN_WARNING
410 "unable to send message to OS/400!");
411 viocd_end_request(req, 0);
412 } else
413 rwreq++;
414 }
415 }
416
417 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
418 {
419 struct viocd_waitevent we;
420 HvLpEvent_Rc hvrc;
421 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
422
423 init_completion(&we.com);
424
425 /* Send the open event to OS/400 */
426 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
427 HvLpEvent_Type_VirtualIo,
428 viomajorsubtype_cdio | viocdcheck,
429 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
430 viopath_sourceinst(viopath_hostLp),
431 viopath_targetinst(viopath_hostLp),
432 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
433 0, 0, 0);
434 if (hvrc != 0) {
435 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
436 (int)hvrc);
437 return -EIO;
438 }
439
440 wait_for_completion(&we.com);
441
442 /* Check the return code. If bad, assume no change */
443 if (we.rc) {
444 const struct vio_error_entry *err =
445 vio_lookup_rc(viocd_err_table, we.sub_result);
446 printk(VIOCD_KERN_WARNING
447 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
448 we.rc, we.sub_result, err->msg);
449 return 0;
450 }
451
452 return we.changed;
453 }
454
455 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
456 {
457 HvLpEvent_Rc hvrc;
458 u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
459 /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
460 u64 flags = !!locking;
461 struct viocd_waitevent we;
462
463 init_completion(&we.com);
464
465 /* Send the lockdoor event to OS/400 */
466 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
467 HvLpEvent_Type_VirtualIo,
468 viomajorsubtype_cdio | viocdlockdoor,
469 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
470 viopath_sourceinst(viopath_hostLp),
471 viopath_targetinst(viopath_hostLp),
472 (u64)&we, VIOVERSION << 16,
473 (device_no << 48) | (flags << 32), 0, 0, 0);
474 if (hvrc != 0) {
475 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
476 (int)hvrc);
477 return -EIO;
478 }
479
480 wait_for_completion(&we.com);
481
482 if (we.rc != 0)
483 return -EIO;
484 return 0;
485 }
486
487 static int viocd_packet(struct cdrom_device_info *cdi,
488 struct packet_command *cgc)
489 {
490 unsigned int buflen = cgc->buflen;
491 int ret = -EIO;
492
493 switch (cgc->cmd[0]) {
494 case GPCMD_READ_DISC_INFO:
495 {
496 disc_information *di = (disc_information *)cgc->buffer;
497
498 if (buflen >= 2) {
499 di->disc_information_length = cpu_to_be16(1);
500 ret = 0;
501 }
502 if (buflen >= 3)
503 di->erasable =
504 (cdi->ops->capability & ~cdi->mask
505 & (CDC_DVD_RAM | CDC_RAM)) != 0;
506 }
507 break;
508 case GPCMD_GET_CONFIGURATION:
509 if (cgc->cmd[3] == CDF_RWRT) {
510 struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
511
512 if ((buflen >=
513 (sizeof(struct feature_header) + sizeof(*rfd))) &&
514 (cdi->ops->capability & ~cdi->mask
515 & (CDC_DVD_RAM | CDC_RAM))) {
516 rfd->feature_code = cpu_to_be16(CDF_RWRT);
517 rfd->curr = 1;
518 ret = 0;
519 }
520 }
521 break;
522 default:
523 if (cgc->sense) {
524 /* indicate Unknown code */
525 cgc->sense->sense_key = 0x05;
526 cgc->sense->asc = 0x20;
527 cgc->sense->ascq = 0x00;
528 }
529 break;
530 }
531
532 cgc->stat = ret;
533 return ret;
534 }
535
536 static void restart_all_queues(int first_index)
537 {
538 int i;
539
540 for (i = first_index + 1; i < viocd_numdev; i++)
541 if (viocd_diskinfo[i].viocd_disk)
542 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
543 for (i = 0; i <= first_index; i++)
544 if (viocd_diskinfo[i].viocd_disk)
545 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
546 }
547
548 /* This routine handles incoming CD LP events */
549 static void vio_handle_cd_event(struct HvLpEvent *event)
550 {
551 struct viocdlpevent *bevent;
552 struct viocd_waitevent *pwe;
553 struct disk_info *di;
554 unsigned long flags;
555 struct request *req;
556
557
558 if (event == NULL)
559 /* Notification that a partition went away! */
560 return;
561 /* First, we should NEVER get an int here...only acks */
562 if (hvlpevent_is_int(event)) {
563 printk(VIOCD_KERN_WARNING
564 "Yikes! got an int in viocd event handler!\n");
565 if (hvlpevent_need_ack(event)) {
566 event->xRc = HvLpEvent_Rc_InvalidSubtype;
567 HvCallEvent_ackLpEvent(event);
568 }
569 }
570
571 bevent = (struct viocdlpevent *)event;
572
573 switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
574 case viocdopen:
575 if (event->xRc == 0) {
576 di = &viocd_diskinfo[bevent->disk];
577 blk_queue_hardsect_size(di->viocd_disk->queue,
578 bevent->block_size);
579 set_capacity(di->viocd_disk,
580 bevent->media_size *
581 bevent->block_size / 512);
582 }
583 /* FALLTHROUGH !! */
584 case viocdgetinfo:
585 case viocdlockdoor:
586 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
587 return_complete:
588 pwe->rc = event->xRc;
589 pwe->sub_result = bevent->sub_result;
590 complete(&pwe->com);
591 break;
592
593 case viocdcheck:
594 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
595 pwe->changed = bevent->flags;
596 goto return_complete;
597
598 case viocdclose:
599 break;
600
601 case viocdwrite:
602 case viocdread:
603 /*
604 * Since this is running in interrupt mode, we need to
605 * make sure we're not stepping on any global I/O operations
606 */
607 di = &viocd_diskinfo[bevent->disk];
608 spin_lock_irqsave(&viocd_reqlock, flags);
609 dma_unmap_single(di->dev, bevent->token, bevent->len,
610 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
611 ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
612 req = (struct request *)bevent->event.xCorrelationToken;
613 rwreq--;
614
615 if (event->xRc != HvLpEvent_Rc_Good) {
616 const struct vio_error_entry *err =
617 vio_lookup_rc(viocd_err_table,
618 bevent->sub_result);
619 printk(VIOCD_KERN_WARNING "request %p failed "
620 "with rc %d:0x%04X: %s\n",
621 req, event->xRc,
622 bevent->sub_result, err->msg);
623 viocd_end_request(req, 0);
624 } else
625 viocd_end_request(req, 1);
626
627 /* restart handling of incoming requests */
628 spin_unlock_irqrestore(&viocd_reqlock, flags);
629 restart_all_queues(bevent->disk);
630 break;
631
632 default:
633 printk(VIOCD_KERN_WARNING
634 "message with invalid subtype %0x04X!\n",
635 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
636 if (hvlpevent_need_ack(event)) {
637 event->xRc = HvLpEvent_Rc_InvalidSubtype;
638 HvCallEvent_ackLpEvent(event);
639 }
640 }
641 }
642
643 static struct cdrom_device_ops viocd_dops = {
644 .open = viocd_open,
645 .release = viocd_release,
646 .media_changed = viocd_media_changed,
647 .lock_door = viocd_lock_door,
648 .generic_packet = viocd_packet,
649 .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
650 };
651
652 static int __init find_capability(const char *type)
653 {
654 struct capability_entry *entry;
655
656 for(entry = capability_table; entry->type; ++entry)
657 if(!strncmp(entry->type, type, 4))
658 break;
659 return entry->capability;
660 }
661
662 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
663 {
664 struct gendisk *gendisk;
665 int deviceno;
666 struct disk_info *d;
667 struct cdrom_device_info *c;
668 struct cdrom_info *ci;
669 struct request_queue *q;
670
671 deviceno = vdev->unit_address;
672 if (deviceno >= viocd_numdev)
673 return -ENODEV;
674
675 d = &viocd_diskinfo[deviceno];
676 c = &d->viocd_info;
677 ci = &viocd_unitinfo[deviceno];
678
679 c->ops = &viocd_dops;
680 c->speed = 4;
681 c->capacity = 1;
682 c->handle = d;
683 c->mask = ~find_capability(ci->type);
684 sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
685
686 if (register_cdrom(c) != 0) {
687 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
688 c->name);
689 goto out;
690 }
691 printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
692 "type %4.4s, model %3.3s\n",
693 c->name, ci->rsrcname, ci->type, ci->model);
694 q = blk_init_queue(do_viocd_request, &viocd_reqlock);
695 if (q == NULL) {
696 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
697 c->name);
698 goto out_unregister_cdrom;
699 }
700 gendisk = alloc_disk(1);
701 if (gendisk == NULL) {
702 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
703 c->name);
704 goto out_cleanup_queue;
705 }
706 gendisk->major = VIOCD_MAJOR;
707 gendisk->first_minor = deviceno;
708 strncpy(gendisk->disk_name, c->name,
709 sizeof(gendisk->disk_name));
710 blk_queue_max_hw_segments(q, 1);
711 blk_queue_max_phys_segments(q, 1);
712 blk_queue_max_sectors(q, 4096 / 512);
713 gendisk->queue = q;
714 gendisk->fops = &viocd_fops;
715 gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
716 set_capacity(gendisk, 0);
717 gendisk->private_data = d;
718 d->viocd_disk = gendisk;
719 d->dev = &vdev->dev;
720 gendisk->driverfs_dev = d->dev;
721 add_disk(gendisk);
722 return 0;
723
724 out_cleanup_queue:
725 blk_cleanup_queue(q);
726 out_unregister_cdrom:
727 unregister_cdrom(c);
728 out:
729 return -ENODEV;
730 }
731
732 static int viocd_remove(struct vio_dev *vdev)
733 {
734 struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
735
736 if (unregister_cdrom(&d->viocd_info) != 0)
737 printk(VIOCD_KERN_WARNING
738 "Cannot unregister viocd CD-ROM %s!\n",
739 d->viocd_info.name);
740 del_gendisk(d->viocd_disk);
741 blk_cleanup_queue(d->viocd_disk->queue);
742 put_disk(d->viocd_disk);
743 return 0;
744 }
745
746 /**
747 * viocd_device_table: Used by vio.c to match devices that we
748 * support.
749 */
750 static struct vio_device_id viocd_device_table[] __devinitdata = {
751 { "block", "IBM,iSeries-viocd" },
752 { "", "" }
753 };
754 MODULE_DEVICE_TABLE(vio, viocd_device_table);
755
756 static struct vio_driver viocd_driver = {
757 .id_table = viocd_device_table,
758 .probe = viocd_probe,
759 .remove = viocd_remove,
760 .driver = {
761 .name = "viocd",
762 .owner = THIS_MODULE,
763 }
764 };
765
766 static int __init viocd_init(void)
767 {
768 struct proc_dir_entry *e;
769 int ret = 0;
770
771 if (!firmware_has_feature(FW_FEATURE_ISERIES))
772 return -ENODEV;
773
774 if (viopath_hostLp == HvLpIndexInvalid) {
775 vio_set_hostlp();
776 /* If we don't have a host, bail out */
777 if (viopath_hostLp == HvLpIndexInvalid)
778 return -ENODEV;
779 }
780
781 printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
782 viopath_hostLp);
783
784 if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
785 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
786 VIOCD_MAJOR, VIOCD_DEVICE);
787 return -EIO;
788 }
789
790 ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
791 MAX_CD_REQ + 2);
792 if (ret) {
793 printk(VIOCD_KERN_WARNING
794 "error opening path to host partition %d\n",
795 viopath_hostLp);
796 goto out_unregister;
797 }
798
799 /* Initialize our request handler */
800 vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
801
802 get_viocd_info();
803
804 spin_lock_init(&viocd_reqlock);
805
806 ret = vio_register_driver(&viocd_driver);
807 if (ret)
808 goto out_free_info;
809
810 e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
811 if (e) {
812 e->owner = THIS_MODULE;
813 e->proc_fops = &proc_viocd_operations;
814 }
815
816 return 0;
817
818 out_free_info:
819 dma_free_coherent(iSeries_vio_dev,
820 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
821 viocd_unitinfo, unitinfo_dmaaddr);
822 vio_clearHandler(viomajorsubtype_cdio);
823 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
824 out_unregister:
825 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
826 return ret;
827 }
828
829 static void __exit viocd_exit(void)
830 {
831 remove_proc_entry("iSeries/viocd", NULL);
832 vio_unregister_driver(&viocd_driver);
833 if (viocd_unitinfo != NULL)
834 dma_free_coherent(iSeries_vio_dev,
835 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
836 viocd_unitinfo, unitinfo_dmaaddr);
837 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
838 vio_clearHandler(viomajorsubtype_cdio);
839 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
840 }
841
842 module_init(viocd_init);
843 module_exit(viocd_exit);
844 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree