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1/*
2 * SCSI Enclosure Services
3 *
4 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
5 *
6**-----------------------------------------------------------------------------
7**
8** This program is free software; you can redistribute it and/or
9** modify it under the terms of the GNU General Public License
10** version 2 as published by the Free Software Foundation.
11**
12** This program is distributed in the hope that it will be useful,
13** but WITHOUT ANY WARRANTY; without even the implied warranty of
14** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15** GNU General Public License for more details.
16**
17** You should have received a copy of the GNU General Public License
18** along with this program; if not, write to the Free Software
19** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20**
21**-----------------------------------------------------------------------------
22*/
23
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/enclosure.h>
28#include <asm/unaligned.h>
29
30#include <scsi/scsi.h>
31#include <scsi/scsi_cmnd.h>
32#include <scsi/scsi_dbg.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_driver.h>
35#include <scsi/scsi_host.h>
36
37struct ses_device {
38 unsigned char *page1;
39 unsigned char *page1_types;
40 unsigned char *page2;
41 unsigned char *page10;
42 short page1_len;
43 short page1_num_types;
44 short page2_len;
45 short page10_len;
46};
47
48struct ses_component {
49 u64 addr;
50 unsigned char *desc;
51};
52
53static int ses_probe(struct device *dev)
54{
55 struct scsi_device *sdev = to_scsi_device(dev);
56 int err = -ENODEV;
57
58 if (sdev->type != TYPE_ENCLOSURE)
59 goto out;
60
61 err = 0;
62 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
63
64 out:
65 return err;
66}
67
68#define SES_TIMEOUT (30 * HZ)
69#define SES_RETRIES 3
70
71static int ses_recv_diag(struct scsi_device *sdev, int page_code,
72 void *buf, int bufflen)
73{
74 unsigned char cmd[] = {
75 RECEIVE_DIAGNOSTIC,
76 1, /* Set PCV bit */
77 page_code,
78 bufflen >> 8,
79 bufflen & 0xff,
80 0
81 };
82
83 return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
84 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
85}
86
87static int ses_send_diag(struct scsi_device *sdev, int page_code,
88 void *buf, int bufflen)
89{
90 u32 result;
91
92 unsigned char cmd[] = {
93 SEND_DIAGNOSTIC,
94 0x10, /* Set PF bit */
95 0,
96 bufflen >> 8,
97 bufflen & 0xff,
98 0
99 };
100
101 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
102 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
103 if (result)
104 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
105 result);
106 return result;
107}
108
109static int ses_set_page2_descriptor(struct enclosure_device *edev,
110 struct enclosure_component *ecomp,
111 unsigned char *desc)
112{
113 int i, j, count = 0, descriptor = ecomp->number;
114 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
115 struct ses_device *ses_dev = edev->scratch;
116 unsigned char *type_ptr = ses_dev->page1_types;
117 unsigned char *desc_ptr = ses_dev->page2 + 8;
118
119 /* Clear everything */
120 memset(desc_ptr, 0, ses_dev->page2_len - 8);
121 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
122 for (j = 0; j < type_ptr[1]; j++) {
123 desc_ptr += 4;
124 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
125 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
126 continue;
127 if (count++ == descriptor) {
128 memcpy(desc_ptr, desc, 4);
129 /* set select */
130 desc_ptr[0] |= 0x80;
131 /* clear reserved, just in case */
132 desc_ptr[0] &= 0xf0;
133 }
134 }
135 }
136
137 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
138}
139
140static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
141 struct enclosure_component *ecomp)
142{
143 int i, j, count = 0, descriptor = ecomp->number;
144 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
145 struct ses_device *ses_dev = edev->scratch;
146 unsigned char *type_ptr = ses_dev->page1_types;
147 unsigned char *desc_ptr = ses_dev->page2 + 8;
148
149 ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
150
151 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
152 for (j = 0; j < type_ptr[1]; j++) {
153 desc_ptr += 4;
154 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
155 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
156 continue;
157 if (count++ == descriptor)
158 return desc_ptr;
159 }
160 }
161 return NULL;
162}
163
164/* For device slot and array device slot elements, byte 3 bit 6
165 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
166 * code stands these bits are shifted 4 positions right so in
167 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
168static void ses_get_fault(struct enclosure_device *edev,
169 struct enclosure_component *ecomp)
170{
171 unsigned char *desc;
172
173 desc = ses_get_page2_descriptor(edev, ecomp);
174 if (desc)
175 ecomp->fault = (desc[3] & 0x60) >> 4;
176}
177
178static int ses_set_fault(struct enclosure_device *edev,
179 struct enclosure_component *ecomp,
180 enum enclosure_component_setting val)
181{
182 unsigned char desc[4] = {0 };
183
184 switch (val) {
185 case ENCLOSURE_SETTING_DISABLED:
186 /* zero is disabled */
187 break;
188 case ENCLOSURE_SETTING_ENABLED:
189 desc[3] = 0x20;
190 break;
191 default:
192 /* SES doesn't do the SGPIO blink settings */
193 return -EINVAL;
194 }
195
196 return ses_set_page2_descriptor(edev, ecomp, desc);
197}
198
199static void ses_get_status(struct enclosure_device *edev,
200 struct enclosure_component *ecomp)
201{
202 unsigned char *desc;
203
204 desc = ses_get_page2_descriptor(edev, ecomp);
205 if (desc)
206 ecomp->status = (desc[0] & 0x0f);
207}
208
209static void ses_get_locate(struct enclosure_device *edev,
210 struct enclosure_component *ecomp)
211{
212 unsigned char *desc;
213
214 desc = ses_get_page2_descriptor(edev, ecomp);
215 if (desc)
216 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
217}
218
219static int ses_set_locate(struct enclosure_device *edev,
220 struct enclosure_component *ecomp,
221 enum enclosure_component_setting val)
222{
223 unsigned char desc[4] = {0 };
224
225 switch (val) {
226 case ENCLOSURE_SETTING_DISABLED:
227 /* zero is disabled */
228 break;
229 case ENCLOSURE_SETTING_ENABLED:
230 desc[2] = 0x02;
231 break;
232 default:
233 /* SES doesn't do the SGPIO blink settings */
234 return -EINVAL;
235 }
236 return ses_set_page2_descriptor(edev, ecomp, desc);
237}
238
239static int ses_set_active(struct enclosure_device *edev,
240 struct enclosure_component *ecomp,
241 enum enclosure_component_setting val)
242{
243 unsigned char desc[4] = {0 };
244
245 switch (val) {
246 case ENCLOSURE_SETTING_DISABLED:
247 /* zero is disabled */
248 ecomp->active = 0;
249 break;
250 case ENCLOSURE_SETTING_ENABLED:
251 desc[2] = 0x80;
252 ecomp->active = 1;
253 break;
254 default:
255 /* SES doesn't do the SGPIO blink settings */
256 return -EINVAL;
257 }
258 return ses_set_page2_descriptor(edev, ecomp, desc);
259}
260
261static struct enclosure_component_callbacks ses_enclosure_callbacks = {
262 .get_fault = ses_get_fault,
263 .set_fault = ses_set_fault,
264 .get_status = ses_get_status,
265 .get_locate = ses_get_locate,
266 .set_locate = ses_set_locate,
267 .set_active = ses_set_active,
268};
269
270struct ses_host_edev {
271 struct Scsi_Host *shost;
272 struct enclosure_device *edev;
273};
274
275#if 0
276int ses_match_host(struct enclosure_device *edev, void *data)
277{
278 struct ses_host_edev *sed = data;
279 struct scsi_device *sdev;
280
281 if (!scsi_is_sdev_device(edev->edev.parent))
282 return 0;
283
284 sdev = to_scsi_device(edev->edev.parent);
285
286 if (sdev->host != sed->shost)
287 return 0;
288
289 sed->edev = edev;
290 return 1;
291}
292#endif /* 0 */
293
294static void ses_process_descriptor(struct enclosure_component *ecomp,
295 unsigned char *desc)
296{
297 int eip = desc[0] & 0x10;
298 int invalid = desc[0] & 0x80;
299 enum scsi_protocol proto = desc[0] & 0x0f;
300 u64 addr = 0;
301 struct ses_component *scomp = ecomp->scratch;
302 unsigned char *d;
303
304 scomp->desc = desc;
305
306 if (invalid)
307 return;
308
309 switch (proto) {
310 case SCSI_PROTOCOL_SAS:
311 if (eip)
312 d = desc + 8;
313 else
314 d = desc + 4;
315 /* only take the phy0 addr */
316 addr = (u64)d[12] << 56 |
317 (u64)d[13] << 48 |
318 (u64)d[14] << 40 |
319 (u64)d[15] << 32 |
320 (u64)d[16] << 24 |
321 (u64)d[17] << 16 |
322 (u64)d[18] << 8 |
323 (u64)d[19];
324 break;
325 default:
326 /* FIXME: Need to add more protocols than just SAS */
327 break;
328 }
329 scomp->addr = addr;
330}
331
332struct efd {
333 u64 addr;
334 struct device *dev;
335};
336
337static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
338 void *data)
339{
340 struct efd *efd = data;
341 int i;
342 struct ses_component *scomp;
343
344 if (!edev->component[0].scratch)
345 return 0;
346
347 for (i = 0; i < edev->components; i++) {
348 scomp = edev->component[i].scratch;
349 if (scomp->addr != efd->addr)
350 continue;
351
352 enclosure_add_device(edev, i, efd->dev);
353 return 1;
354 }
355 return 0;
356}
357
358#define INIT_ALLOC_SIZE 32
359
360static void ses_enclosure_data_process(struct enclosure_device *edev,
361 struct scsi_device *sdev,
362 int create)
363{
364 u32 result;
365 unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
366 int i, j, page7_len, len, components;
367 struct ses_device *ses_dev = edev->scratch;
368 int types = ses_dev->page1_num_types;
369 unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
370
371 if (!hdr_buf)
372 goto simple_populate;
373
374 /* re-read page 10 */
375 if (ses_dev->page10)
376 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
377 /* Page 7 for the descriptors is optional */
378 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
379 if (result)
380 goto simple_populate;
381
382 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
383 /* add 1 for trailing '\0' we'll use */
384 buf = kzalloc(len + 1, GFP_KERNEL);
385 if (!buf)
386 goto simple_populate;
387 result = ses_recv_diag(sdev, 7, buf, len);
388 if (result) {
389 simple_populate:
390 kfree(buf);
391 buf = NULL;
392 desc_ptr = NULL;
393 len = 0;
394 page7_len = 0;
395 } else {
396 desc_ptr = buf + 8;
397 len = (desc_ptr[2] << 8) + desc_ptr[3];
398 /* skip past overall descriptor */
399 desc_ptr += len + 4;
400 }
401 if (ses_dev->page10)
402 addl_desc_ptr = ses_dev->page10 + 8;
403 type_ptr = ses_dev->page1_types;
404 components = 0;
405 for (i = 0; i < types; i++, type_ptr += 4) {
406 for (j = 0; j < type_ptr[1]; j++) {
407 char *name = NULL;
408 struct enclosure_component *ecomp;
409
410 if (desc_ptr) {
411 if (desc_ptr >= buf + page7_len) {
412 desc_ptr = NULL;
413 } else {
414 len = (desc_ptr[2] << 8) + desc_ptr[3];
415 desc_ptr += 4;
416 /* Add trailing zero - pushes into
417 * reserved space */
418 desc_ptr[len] = '\0';
419 name = desc_ptr;
420 }
421 }
422 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
423 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
424
425 if (create)
426 ecomp = enclosure_component_register(edev,
427 components++,
428 type_ptr[0],
429 name);
430 else
431 ecomp = &edev->component[components++];
432
433 if (!IS_ERR(ecomp) && addl_desc_ptr)
434 ses_process_descriptor(ecomp,
435 addl_desc_ptr);
436 }
437 if (desc_ptr)
438 desc_ptr += len;
439
440 if (addl_desc_ptr)
441 addl_desc_ptr += addl_desc_ptr[1] + 2;
442
443 }
444 }
445 kfree(buf);
446 kfree(hdr_buf);
447}
448
449static void ses_match_to_enclosure(struct enclosure_device *edev,
450 struct scsi_device *sdev)
451{
452 unsigned char *desc;
453 struct efd efd = {
454 .addr = 0,
455 };
456
457 ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
458
459 if (!sdev->vpd_pg83_len)
460 return;
461
462 desc = sdev->vpd_pg83 + 4;
463 while (desc < sdev->vpd_pg83 + sdev->vpd_pg83_len) {
464 enum scsi_protocol proto = desc[0] >> 4;
465 u8 code_set = desc[0] & 0x0f;
466 u8 piv = desc[1] & 0x80;
467 u8 assoc = (desc[1] & 0x30) >> 4;
468 u8 type = desc[1] & 0x0f;
469 u8 len = desc[3];
470
471 if (piv && code_set == 1 && assoc == 1
472 && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
473 efd.addr = get_unaligned_be64(&desc[4]);
474
475 desc += len + 4;
476 }
477 if (efd.addr) {
478 efd.dev = &sdev->sdev_gendev;
479
480 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
481 }
482}
483
484static int ses_intf_add(struct device *cdev,
485 struct class_interface *intf)
486{
487 struct scsi_device *sdev = to_scsi_device(cdev->parent);
488 struct scsi_device *tmp_sdev;
489 unsigned char *buf = NULL, *hdr_buf, *type_ptr;
490 struct ses_device *ses_dev;
491 u32 result;
492 int i, types, len, components = 0;
493 int err = -ENOMEM;
494 int num_enclosures;
495 struct enclosure_device *edev;
496 struct ses_component *scomp = NULL;
497
498 if (!scsi_device_enclosure(sdev)) {
499 /* not an enclosure, but might be in one */
500 struct enclosure_device *prev = NULL;
501
502 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
503 ses_match_to_enclosure(edev, sdev);
504 prev = edev;
505 }
506 return -ENODEV;
507 }
508
509 /* TYPE_ENCLOSURE prints a message in probe */
510 if (sdev->type != TYPE_ENCLOSURE)
511 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
512
513 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
514 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
515 if (!hdr_buf || !ses_dev)
516 goto err_init_free;
517
518 result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
519 if (result)
520 goto recv_failed;
521
522 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
523 buf = kzalloc(len, GFP_KERNEL);
524 if (!buf)
525 goto err_free;
526
527 result = ses_recv_diag(sdev, 1, buf, len);
528 if (result)
529 goto recv_failed;
530
531 types = 0;
532
533 /* we always have one main enclosure and the rest are referred
534 * to as secondary subenclosures */
535 num_enclosures = buf[1] + 1;
536
537 /* begin at the enclosure descriptor */
538 type_ptr = buf + 8;
539 /* skip all the enclosure descriptors */
540 for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
541 types += type_ptr[2];
542 type_ptr += type_ptr[3] + 4;
543 }
544
545 ses_dev->page1_types = type_ptr;
546 ses_dev->page1_num_types = types;
547
548 for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
549 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
550 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
551 components += type_ptr[1];
552 }
553 ses_dev->page1 = buf;
554 ses_dev->page1_len = len;
555 buf = NULL;
556
557 result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
558 if (result)
559 goto recv_failed;
560
561 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
562 buf = kzalloc(len, GFP_KERNEL);
563 if (!buf)
564 goto err_free;
565
566 /* make sure getting page 2 actually works */
567 result = ses_recv_diag(sdev, 2, buf, len);
568 if (result)
569 goto recv_failed;
570 ses_dev->page2 = buf;
571 ses_dev->page2_len = len;
572 buf = NULL;
573
574 /* The additional information page --- allows us
575 * to match up the devices */
576 result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
577 if (!result) {
578
579 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
580 buf = kzalloc(len, GFP_KERNEL);
581 if (!buf)
582 goto err_free;
583
584 result = ses_recv_diag(sdev, 10, buf, len);
585 if (result)
586 goto recv_failed;
587 ses_dev->page10 = buf;
588 ses_dev->page10_len = len;
589 buf = NULL;
590 }
591 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
592 if (!scomp)
593 goto err_free;
594
595 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
596 components, &ses_enclosure_callbacks);
597 if (IS_ERR(edev)) {
598 err = PTR_ERR(edev);
599 goto err_free;
600 }
601
602 kfree(hdr_buf);
603
604 edev->scratch = ses_dev;
605 for (i = 0; i < components; i++)
606 edev->component[i].scratch = scomp + i;
607
608 ses_enclosure_data_process(edev, sdev, 1);
609
610 /* see if there are any devices matching before
611 * we found the enclosure */
612 shost_for_each_device(tmp_sdev, sdev->host) {
613 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
614 continue;
615 ses_match_to_enclosure(edev, tmp_sdev);
616 }
617
618 return 0;
619
620 recv_failed:
621 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
622 result);
623 err = -ENODEV;
624 err_free:
625 kfree(buf);
626 kfree(scomp);
627 kfree(ses_dev->page10);
628 kfree(ses_dev->page2);
629 kfree(ses_dev->page1);
630 err_init_free:
631 kfree(ses_dev);
632 kfree(hdr_buf);
633 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
634 return err;
635}
636
637static int ses_remove(struct device *dev)
638{
639 return 0;
640}
641
642static void ses_intf_remove_component(struct scsi_device *sdev)
643{
644 struct enclosure_device *edev, *prev = NULL;
645
646 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
647 prev = edev;
648 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
649 break;
650 }
651 if (edev)
652 put_device(&edev->edev);
653}
654
655static void ses_intf_remove_enclosure(struct scsi_device *sdev)
656{
657 struct enclosure_device *edev;
658 struct ses_device *ses_dev;
659
660 /* exact match to this enclosure */
661 edev = enclosure_find(&sdev->sdev_gendev, NULL);
662 if (!edev)
663 return;
664
665 ses_dev = edev->scratch;
666 edev->scratch = NULL;
667
668 kfree(ses_dev->page10);
669 kfree(ses_dev->page1);
670 kfree(ses_dev->page2);
671 kfree(ses_dev);
672
673 kfree(edev->component[0].scratch);
674
675 put_device(&edev->edev);
676 enclosure_unregister(edev);
677}
678
679static void ses_intf_remove(struct device *cdev,
680 struct class_interface *intf)
681{
682 struct scsi_device *sdev = to_scsi_device(cdev->parent);
683
684 if (!scsi_device_enclosure(sdev))
685 ses_intf_remove_component(sdev);
686 else
687 ses_intf_remove_enclosure(sdev);
688}
689
690static struct class_interface ses_interface = {
691 .add_dev = ses_intf_add,
692 .remove_dev = ses_intf_remove,
693};
694
695static struct scsi_driver ses_template = {
696 .owner = THIS_MODULE,
697 .gendrv = {
698 .name = "ses",
699 .probe = ses_probe,
700 .remove = ses_remove,
701 },
702};
703
704static int __init ses_init(void)
705{
706 int err;
707
708 err = scsi_register_interface(&ses_interface);
709 if (err)
710 return err;
711
712 err = scsi_register_driver(&ses_template.gendrv);
713 if (err)
714 goto out_unreg;
715
716 return 0;
717
718 out_unreg:
719 scsi_unregister_interface(&ses_interface);
720 return err;
721}
722
723static void __exit ses_exit(void)
724{
725 scsi_unregister_driver(&ses_template.gendrv);
726 scsi_unregister_interface(&ses_interface);
727}
728
729module_init(ses_init);
730module_exit(ses_exit);
731
732MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
733
734MODULE_AUTHOR("James Bottomley");
735MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
736MODULE_LICENSE("GPL v2");
1/*
2 * SCSI Enclosure Services
3 *
4 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
5 *
6**-----------------------------------------------------------------------------
7**
8** This program is free software; you can redistribute it and/or
9** modify it under the terms of the GNU General Public License
10** version 2 as published by the Free Software Foundation.
11**
12** This program is distributed in the hope that it will be useful,
13** but WITHOUT ANY WARRANTY; without even the implied warranty of
14** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15** GNU General Public License for more details.
16**
17** You should have received a copy of the GNU General Public License
18** along with this program; if not, write to the Free Software
19** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20**
21**-----------------------------------------------------------------------------
22*/
23
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/enclosure.h>
28#include <asm/unaligned.h>
29
30#include <scsi/scsi.h>
31#include <scsi/scsi_cmnd.h>
32#include <scsi/scsi_dbg.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_driver.h>
35#include <scsi/scsi_host.h>
36
37#include <scsi/scsi_transport_sas.h>
38
39struct ses_device {
40 unsigned char *page1;
41 unsigned char *page1_types;
42 unsigned char *page2;
43 unsigned char *page10;
44 short page1_len;
45 short page1_num_types;
46 short page2_len;
47 short page10_len;
48};
49
50struct ses_component {
51 u64 addr;
52};
53
54static int ses_probe(struct device *dev)
55{
56 struct scsi_device *sdev = to_scsi_device(dev);
57 int err = -ENODEV;
58
59 if (sdev->type != TYPE_ENCLOSURE)
60 goto out;
61
62 err = 0;
63 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
64
65 out:
66 return err;
67}
68
69#define SES_TIMEOUT (30 * HZ)
70#define SES_RETRIES 3
71
72static void init_device_slot_control(unsigned char *dest_desc,
73 struct enclosure_component *ecomp,
74 unsigned char *status)
75{
76 memcpy(dest_desc, status, 4);
77 dest_desc[0] = 0;
78 /* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
79 if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
80 dest_desc[1] = 0;
81 dest_desc[2] &= 0xde;
82 dest_desc[3] &= 0x3c;
83}
84
85
86static int ses_recv_diag(struct scsi_device *sdev, int page_code,
87 void *buf, int bufflen)
88{
89 int ret;
90 unsigned char cmd[] = {
91 RECEIVE_DIAGNOSTIC,
92 1, /* Set PCV bit */
93 page_code,
94 bufflen >> 8,
95 bufflen & 0xff,
96 0
97 };
98 unsigned char recv_page_code;
99
100 ret = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
101 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
102 if (unlikely(!ret))
103 return ret;
104
105 recv_page_code = ((unsigned char *)buf)[0];
106
107 if (likely(recv_page_code == page_code))
108 return ret;
109
110 /* successful diagnostic but wrong page code. This happens to some
111 * USB devices, just print a message and pretend there was an error */
112
113 sdev_printk(KERN_ERR, sdev,
114 "Wrong diagnostic page; asked for %d got %u\n",
115 page_code, recv_page_code);
116
117 return -EINVAL;
118}
119
120static int ses_send_diag(struct scsi_device *sdev, int page_code,
121 void *buf, int bufflen)
122{
123 u32 result;
124
125 unsigned char cmd[] = {
126 SEND_DIAGNOSTIC,
127 0x10, /* Set PF bit */
128 0,
129 bufflen >> 8,
130 bufflen & 0xff,
131 0
132 };
133
134 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
135 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
136 if (result)
137 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
138 result);
139 return result;
140}
141
142static int ses_set_page2_descriptor(struct enclosure_device *edev,
143 struct enclosure_component *ecomp,
144 unsigned char *desc)
145{
146 int i, j, count = 0, descriptor = ecomp->number;
147 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
148 struct ses_device *ses_dev = edev->scratch;
149 unsigned char *type_ptr = ses_dev->page1_types;
150 unsigned char *desc_ptr = ses_dev->page2 + 8;
151
152 /* Clear everything */
153 memset(desc_ptr, 0, ses_dev->page2_len - 8);
154 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
155 for (j = 0; j < type_ptr[1]; j++) {
156 desc_ptr += 4;
157 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
158 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
159 continue;
160 if (count++ == descriptor) {
161 memcpy(desc_ptr, desc, 4);
162 /* set select */
163 desc_ptr[0] |= 0x80;
164 /* clear reserved, just in case */
165 desc_ptr[0] &= 0xf0;
166 }
167 }
168 }
169
170 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
171}
172
173static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
174 struct enclosure_component *ecomp)
175{
176 int i, j, count = 0, descriptor = ecomp->number;
177 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
178 struct ses_device *ses_dev = edev->scratch;
179 unsigned char *type_ptr = ses_dev->page1_types;
180 unsigned char *desc_ptr = ses_dev->page2 + 8;
181
182 ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
183
184 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
185 for (j = 0; j < type_ptr[1]; j++) {
186 desc_ptr += 4;
187 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
188 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
189 continue;
190 if (count++ == descriptor)
191 return desc_ptr;
192 }
193 }
194 return NULL;
195}
196
197/* For device slot and array device slot elements, byte 3 bit 6
198 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
199 * code stands these bits are shifted 4 positions right so in
200 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
201static void ses_get_fault(struct enclosure_device *edev,
202 struct enclosure_component *ecomp)
203{
204 unsigned char *desc;
205
206 desc = ses_get_page2_descriptor(edev, ecomp);
207 if (desc)
208 ecomp->fault = (desc[3] & 0x60) >> 4;
209}
210
211static int ses_set_fault(struct enclosure_device *edev,
212 struct enclosure_component *ecomp,
213 enum enclosure_component_setting val)
214{
215 unsigned char desc[4];
216 unsigned char *desc_ptr;
217
218 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
219
220 if (!desc_ptr)
221 return -EIO;
222
223 init_device_slot_control(desc, ecomp, desc_ptr);
224
225 switch (val) {
226 case ENCLOSURE_SETTING_DISABLED:
227 desc[3] &= 0xdf;
228 break;
229 case ENCLOSURE_SETTING_ENABLED:
230 desc[3] |= 0x20;
231 break;
232 default:
233 /* SES doesn't do the SGPIO blink settings */
234 return -EINVAL;
235 }
236
237 return ses_set_page2_descriptor(edev, ecomp, desc);
238}
239
240static void ses_get_status(struct enclosure_device *edev,
241 struct enclosure_component *ecomp)
242{
243 unsigned char *desc;
244
245 desc = ses_get_page2_descriptor(edev, ecomp);
246 if (desc)
247 ecomp->status = (desc[0] & 0x0f);
248}
249
250static void ses_get_locate(struct enclosure_device *edev,
251 struct enclosure_component *ecomp)
252{
253 unsigned char *desc;
254
255 desc = ses_get_page2_descriptor(edev, ecomp);
256 if (desc)
257 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
258}
259
260static int ses_set_locate(struct enclosure_device *edev,
261 struct enclosure_component *ecomp,
262 enum enclosure_component_setting val)
263{
264 unsigned char desc[4];
265 unsigned char *desc_ptr;
266
267 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
268
269 if (!desc_ptr)
270 return -EIO;
271
272 init_device_slot_control(desc, ecomp, desc_ptr);
273
274 switch (val) {
275 case ENCLOSURE_SETTING_DISABLED:
276 desc[2] &= 0xfd;
277 break;
278 case ENCLOSURE_SETTING_ENABLED:
279 desc[2] |= 0x02;
280 break;
281 default:
282 /* SES doesn't do the SGPIO blink settings */
283 return -EINVAL;
284 }
285 return ses_set_page2_descriptor(edev, ecomp, desc);
286}
287
288static int ses_set_active(struct enclosure_device *edev,
289 struct enclosure_component *ecomp,
290 enum enclosure_component_setting val)
291{
292 unsigned char desc[4];
293 unsigned char *desc_ptr;
294
295 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
296
297 if (!desc_ptr)
298 return -EIO;
299
300 init_device_slot_control(desc, ecomp, desc_ptr);
301
302 switch (val) {
303 case ENCLOSURE_SETTING_DISABLED:
304 desc[2] &= 0x7f;
305 ecomp->active = 0;
306 break;
307 case ENCLOSURE_SETTING_ENABLED:
308 desc[2] |= 0x80;
309 ecomp->active = 1;
310 break;
311 default:
312 /* SES doesn't do the SGPIO blink settings */
313 return -EINVAL;
314 }
315 return ses_set_page2_descriptor(edev, ecomp, desc);
316}
317
318static int ses_show_id(struct enclosure_device *edev, char *buf)
319{
320 struct ses_device *ses_dev = edev->scratch;
321 unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
322
323 return sprintf(buf, "%#llx\n", id);
324}
325
326static void ses_get_power_status(struct enclosure_device *edev,
327 struct enclosure_component *ecomp)
328{
329 unsigned char *desc;
330
331 desc = ses_get_page2_descriptor(edev, ecomp);
332 if (desc)
333 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
334}
335
336static int ses_set_power_status(struct enclosure_device *edev,
337 struct enclosure_component *ecomp,
338 int val)
339{
340 unsigned char desc[4];
341 unsigned char *desc_ptr;
342
343 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
344
345 if (!desc_ptr)
346 return -EIO;
347
348 init_device_slot_control(desc, ecomp, desc_ptr);
349
350 switch (val) {
351 /* power = 1 is device_off = 0 and vice versa */
352 case 0:
353 desc[3] |= 0x10;
354 break;
355 case 1:
356 desc[3] &= 0xef;
357 break;
358 default:
359 return -EINVAL;
360 }
361 ecomp->power_status = val;
362 return ses_set_page2_descriptor(edev, ecomp, desc);
363}
364
365static struct enclosure_component_callbacks ses_enclosure_callbacks = {
366 .get_fault = ses_get_fault,
367 .set_fault = ses_set_fault,
368 .get_status = ses_get_status,
369 .get_locate = ses_get_locate,
370 .set_locate = ses_set_locate,
371 .get_power_status = ses_get_power_status,
372 .set_power_status = ses_set_power_status,
373 .set_active = ses_set_active,
374 .show_id = ses_show_id,
375};
376
377struct ses_host_edev {
378 struct Scsi_Host *shost;
379 struct enclosure_device *edev;
380};
381
382#if 0
383int ses_match_host(struct enclosure_device *edev, void *data)
384{
385 struct ses_host_edev *sed = data;
386 struct scsi_device *sdev;
387
388 if (!scsi_is_sdev_device(edev->edev.parent))
389 return 0;
390
391 sdev = to_scsi_device(edev->edev.parent);
392
393 if (sdev->host != sed->shost)
394 return 0;
395
396 sed->edev = edev;
397 return 1;
398}
399#endif /* 0 */
400
401static void ses_process_descriptor(struct enclosure_component *ecomp,
402 unsigned char *desc)
403{
404 int eip = desc[0] & 0x10;
405 int invalid = desc[0] & 0x80;
406 enum scsi_protocol proto = desc[0] & 0x0f;
407 u64 addr = 0;
408 int slot = -1;
409 struct ses_component *scomp = ecomp->scratch;
410 unsigned char *d;
411
412 if (invalid)
413 return;
414
415 switch (proto) {
416 case SCSI_PROTOCOL_FCP:
417 if (eip) {
418 d = desc + 4;
419 slot = d[3];
420 }
421 break;
422 case SCSI_PROTOCOL_SAS:
423 if (eip) {
424 d = desc + 4;
425 slot = d[3];
426 d = desc + 8;
427 } else
428 d = desc + 4;
429 /* only take the phy0 addr */
430 addr = (u64)d[12] << 56 |
431 (u64)d[13] << 48 |
432 (u64)d[14] << 40 |
433 (u64)d[15] << 32 |
434 (u64)d[16] << 24 |
435 (u64)d[17] << 16 |
436 (u64)d[18] << 8 |
437 (u64)d[19];
438 break;
439 default:
440 /* FIXME: Need to add more protocols than just SAS */
441 break;
442 }
443 ecomp->slot = slot;
444 scomp->addr = addr;
445}
446
447struct efd {
448 u64 addr;
449 struct device *dev;
450};
451
452static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
453 void *data)
454{
455 struct efd *efd = data;
456 int i;
457 struct ses_component *scomp;
458
459 if (!edev->component[0].scratch)
460 return 0;
461
462 for (i = 0; i < edev->components; i++) {
463 scomp = edev->component[i].scratch;
464 if (scomp->addr != efd->addr)
465 continue;
466
467 if (enclosure_add_device(edev, i, efd->dev) == 0)
468 kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
469 return 1;
470 }
471 return 0;
472}
473
474#define INIT_ALLOC_SIZE 32
475
476static void ses_enclosure_data_process(struct enclosure_device *edev,
477 struct scsi_device *sdev,
478 int create)
479{
480 u32 result;
481 unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
482 int i, j, page7_len, len, components;
483 struct ses_device *ses_dev = edev->scratch;
484 int types = ses_dev->page1_num_types;
485 unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
486
487 if (!hdr_buf)
488 goto simple_populate;
489
490 /* re-read page 10 */
491 if (ses_dev->page10)
492 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
493 /* Page 7 for the descriptors is optional */
494 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
495 if (result)
496 goto simple_populate;
497
498 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
499 /* add 1 for trailing '\0' we'll use */
500 buf = kzalloc(len + 1, GFP_KERNEL);
501 if (!buf)
502 goto simple_populate;
503 result = ses_recv_diag(sdev, 7, buf, len);
504 if (result) {
505 simple_populate:
506 kfree(buf);
507 buf = NULL;
508 desc_ptr = NULL;
509 len = 0;
510 page7_len = 0;
511 } else {
512 desc_ptr = buf + 8;
513 len = (desc_ptr[2] << 8) + desc_ptr[3];
514 /* skip past overall descriptor */
515 desc_ptr += len + 4;
516 }
517 if (ses_dev->page10)
518 addl_desc_ptr = ses_dev->page10 + 8;
519 type_ptr = ses_dev->page1_types;
520 components = 0;
521 for (i = 0; i < types; i++, type_ptr += 4) {
522 for (j = 0; j < type_ptr[1]; j++) {
523 char *name = NULL;
524 struct enclosure_component *ecomp;
525
526 if (desc_ptr) {
527 if (desc_ptr >= buf + page7_len) {
528 desc_ptr = NULL;
529 } else {
530 len = (desc_ptr[2] << 8) + desc_ptr[3];
531 desc_ptr += 4;
532 /* Add trailing zero - pushes into
533 * reserved space */
534 desc_ptr[len] = '\0';
535 name = desc_ptr;
536 }
537 }
538 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
539 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
540
541 if (create)
542 ecomp = enclosure_component_alloc(
543 edev,
544 components++,
545 type_ptr[0],
546 name);
547 else
548 ecomp = &edev->component[components++];
549
550 if (!IS_ERR(ecomp)) {
551 ses_get_power_status(edev, ecomp);
552 if (addl_desc_ptr)
553 ses_process_descriptor(
554 ecomp,
555 addl_desc_ptr);
556 if (create)
557 enclosure_component_register(
558 ecomp);
559 }
560 }
561 if (desc_ptr)
562 desc_ptr += len;
563
564 if (addl_desc_ptr &&
565 /* only find additional descriptions for specific devices */
566 (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
567 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
568 type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
569 /* these elements are optional */
570 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
571 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
572 type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
573 addl_desc_ptr += addl_desc_ptr[1] + 2;
574
575 }
576 }
577 kfree(buf);
578 kfree(hdr_buf);
579}
580
581static void ses_match_to_enclosure(struct enclosure_device *edev,
582 struct scsi_device *sdev)
583{
584 struct efd efd = {
585 .addr = 0,
586 };
587
588 ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
589
590 if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
591 efd.addr = sas_get_address(sdev);
592
593 if (efd.addr) {
594 efd.dev = &sdev->sdev_gendev;
595
596 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
597 }
598}
599
600static int ses_intf_add(struct device *cdev,
601 struct class_interface *intf)
602{
603 struct scsi_device *sdev = to_scsi_device(cdev->parent);
604 struct scsi_device *tmp_sdev;
605 unsigned char *buf = NULL, *hdr_buf, *type_ptr;
606 struct ses_device *ses_dev;
607 u32 result;
608 int i, types, len, components = 0;
609 int err = -ENOMEM;
610 int num_enclosures;
611 struct enclosure_device *edev;
612 struct ses_component *scomp = NULL;
613
614 if (!scsi_device_enclosure(sdev)) {
615 /* not an enclosure, but might be in one */
616 struct enclosure_device *prev = NULL;
617
618 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
619 ses_match_to_enclosure(edev, sdev);
620 prev = edev;
621 }
622 return -ENODEV;
623 }
624
625 /* TYPE_ENCLOSURE prints a message in probe */
626 if (sdev->type != TYPE_ENCLOSURE)
627 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
628
629 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
630 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
631 if (!hdr_buf || !ses_dev)
632 goto err_init_free;
633
634 result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
635 if (result)
636 goto recv_failed;
637
638 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
639 buf = kzalloc(len, GFP_KERNEL);
640 if (!buf)
641 goto err_free;
642
643 result = ses_recv_diag(sdev, 1, buf, len);
644 if (result)
645 goto recv_failed;
646
647 types = 0;
648
649 /* we always have one main enclosure and the rest are referred
650 * to as secondary subenclosures */
651 num_enclosures = buf[1] + 1;
652
653 /* begin at the enclosure descriptor */
654 type_ptr = buf + 8;
655 /* skip all the enclosure descriptors */
656 for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
657 types += type_ptr[2];
658 type_ptr += type_ptr[3] + 4;
659 }
660
661 ses_dev->page1_types = type_ptr;
662 ses_dev->page1_num_types = types;
663
664 for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
665 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
666 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
667 components += type_ptr[1];
668 }
669 ses_dev->page1 = buf;
670 ses_dev->page1_len = len;
671 buf = NULL;
672
673 result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
674 if (result)
675 goto recv_failed;
676
677 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
678 buf = kzalloc(len, GFP_KERNEL);
679 if (!buf)
680 goto err_free;
681
682 /* make sure getting page 2 actually works */
683 result = ses_recv_diag(sdev, 2, buf, len);
684 if (result)
685 goto recv_failed;
686 ses_dev->page2 = buf;
687 ses_dev->page2_len = len;
688 buf = NULL;
689
690 /* The additional information page --- allows us
691 * to match up the devices */
692 result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
693 if (!result) {
694
695 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
696 buf = kzalloc(len, GFP_KERNEL);
697 if (!buf)
698 goto err_free;
699
700 result = ses_recv_diag(sdev, 10, buf, len);
701 if (result)
702 goto recv_failed;
703 ses_dev->page10 = buf;
704 ses_dev->page10_len = len;
705 buf = NULL;
706 }
707 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
708 if (!scomp)
709 goto err_free;
710
711 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
712 components, &ses_enclosure_callbacks);
713 if (IS_ERR(edev)) {
714 err = PTR_ERR(edev);
715 goto err_free;
716 }
717
718 kfree(hdr_buf);
719
720 edev->scratch = ses_dev;
721 for (i = 0; i < components; i++)
722 edev->component[i].scratch = scomp + i;
723
724 ses_enclosure_data_process(edev, sdev, 1);
725
726 /* see if there are any devices matching before
727 * we found the enclosure */
728 shost_for_each_device(tmp_sdev, sdev->host) {
729 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
730 continue;
731 ses_match_to_enclosure(edev, tmp_sdev);
732 }
733
734 return 0;
735
736 recv_failed:
737 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
738 result);
739 err = -ENODEV;
740 err_free:
741 kfree(buf);
742 kfree(scomp);
743 kfree(ses_dev->page10);
744 kfree(ses_dev->page2);
745 kfree(ses_dev->page1);
746 err_init_free:
747 kfree(ses_dev);
748 kfree(hdr_buf);
749 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
750 return err;
751}
752
753static int ses_remove(struct device *dev)
754{
755 return 0;
756}
757
758static void ses_intf_remove_component(struct scsi_device *sdev)
759{
760 struct enclosure_device *edev, *prev = NULL;
761
762 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
763 prev = edev;
764 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
765 break;
766 }
767 if (edev)
768 put_device(&edev->edev);
769}
770
771static void ses_intf_remove_enclosure(struct scsi_device *sdev)
772{
773 struct enclosure_device *edev;
774 struct ses_device *ses_dev;
775
776 /* exact match to this enclosure */
777 edev = enclosure_find(&sdev->sdev_gendev, NULL);
778 if (!edev)
779 return;
780
781 enclosure_unregister(edev);
782
783 ses_dev = edev->scratch;
784 edev->scratch = NULL;
785
786 kfree(ses_dev->page10);
787 kfree(ses_dev->page1);
788 kfree(ses_dev->page2);
789 kfree(ses_dev);
790
791 kfree(edev->component[0].scratch);
792
793 put_device(&edev->edev);
794}
795
796static void ses_intf_remove(struct device *cdev,
797 struct class_interface *intf)
798{
799 struct scsi_device *sdev = to_scsi_device(cdev->parent);
800
801 if (!scsi_device_enclosure(sdev))
802 ses_intf_remove_component(sdev);
803 else
804 ses_intf_remove_enclosure(sdev);
805}
806
807static struct class_interface ses_interface = {
808 .add_dev = ses_intf_add,
809 .remove_dev = ses_intf_remove,
810};
811
812static struct scsi_driver ses_template = {
813 .gendrv = {
814 .name = "ses",
815 .owner = THIS_MODULE,
816 .probe = ses_probe,
817 .remove = ses_remove,
818 },
819};
820
821static int __init ses_init(void)
822{
823 int err;
824
825 err = scsi_register_interface(&ses_interface);
826 if (err)
827 return err;
828
829 err = scsi_register_driver(&ses_template.gendrv);
830 if (err)
831 goto out_unreg;
832
833 return 0;
834
835 out_unreg:
836 scsi_unregister_interface(&ses_interface);
837 return err;
838}
839
840static void __exit ses_exit(void)
841{
842 scsi_unregister_driver(&ses_template.gendrv);
843 scsi_unregister_interface(&ses_interface);
844}
845
846module_init(ses_init);
847module_exit(ses_exit);
848
849MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
850
851MODULE_AUTHOR("James Bottomley");
852MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
853MODULE_LICENSE("GPL v2");