summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/ses.c
blob: 50adabbb5808902aea6abfd64a39c183678a6a6f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
/*
 * SCSI Enclosure Services
 *
 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
 *
**-----------------------------------------------------------------------------
**
**  This program is free software; you can redistribute it and/or
**  modify it under the terms of the GNU General Public License
**  version 2 as published by the Free Software Foundation.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
*/

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/enclosure.h>
#include <asm/unaligned.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_host.h>

#include <scsi/scsi_transport_sas.h>

struct ses_device {
	unsigned char *page1;
	unsigned char *page1_types;
	unsigned char *page2;
	unsigned char *page10;
	short page1_len;
	short page1_num_types;
	short page2_len;
	short page10_len;
};

struct ses_component {
	u64 addr;
};

static int ses_probe(struct device *dev)
{
	struct scsi_device *sdev = to_scsi_device(dev);
	int err = -ENODEV;

	if (sdev->type != TYPE_ENCLOSURE)
		goto out;

	err = 0;
	sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");

 out:
	return err;
}

#define SES_TIMEOUT (30 * HZ)
#define SES_RETRIES 3

static void init_device_slot_control(unsigned char *dest_desc,
				     struct enclosure_component *ecomp,
				     unsigned char *status)
{
	memcpy(dest_desc, status, 4);
	dest_desc[0] = 0;
	/* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
	if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
		dest_desc[1] = 0;
	dest_desc[2] &= 0xde;
	dest_desc[3] &= 0x3c;
}


static int ses_recv_diag(struct scsi_device *sdev, int page_code,
			 void *buf, int bufflen)
{
	int ret;
	unsigned char cmd[] = {
		RECEIVE_DIAGNOSTIC,
		1,		/* Set PCV bit */
		page_code,
		bufflen >> 8,
		bufflen & 0xff,
		0
	};
	unsigned char recv_page_code;

	ret =  scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
				NULL, SES_TIMEOUT, SES_RETRIES, NULL);
	if (unlikely(!ret))
		return ret;

	recv_page_code = ((unsigned char *)buf)[0];

	if (likely(recv_page_code == page_code))
		return ret;

	/* successful diagnostic but wrong page code.  This happens to some
	 * USB devices, just print a message and pretend there was an error */

	sdev_printk(KERN_ERR, sdev,
		    "Wrong diagnostic page; asked for %d got %u\n",
		    page_code, recv_page_code);

	return -EINVAL;
}

static int ses_send_diag(struct scsi_device *sdev, int page_code,
			 void *buf, int bufflen)
{
	u32 result;

	unsigned char cmd[] = {
		SEND_DIAGNOSTIC,
		0x10,		/* Set PF bit */
		0,
		bufflen >> 8,
		bufflen & 0xff,
		0
	};

	result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
				  NULL, SES_TIMEOUT, SES_RETRIES, NULL);
	if (result)
		sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
			    result);
	return result;
}

static int ses_set_page2_descriptor(struct enclosure_device *edev,
				      struct enclosure_component *ecomp,
				      unsigned char *desc)
{
	int i, j, count = 0, descriptor = ecomp->number;
	struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
	struct ses_device *ses_dev = edev->scratch;
	unsigned char *type_ptr = ses_dev->page1_types;
	unsigned char *desc_ptr = ses_dev->page2 + 8;

	/* Clear everything */
	memset(desc_ptr, 0, ses_dev->page2_len - 8);
	for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
		for (j = 0; j < type_ptr[1]; j++) {
			desc_ptr += 4;
			if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
			    type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
				continue;
			if (count++ == descriptor) {
				memcpy(desc_ptr, desc, 4);
				/* set select */
				desc_ptr[0] |= 0x80;
				/* clear reserved, just in case */
				desc_ptr[0] &= 0xf0;
			}
		}
	}

	return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
}

static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
				      struct enclosure_component *ecomp)
{
	int i, j, count = 0, descriptor = ecomp->number;
	struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
	struct ses_device *ses_dev = edev->scratch;
	unsigned char *type_ptr = ses_dev->page1_types;
	unsigned char *desc_ptr = ses_dev->page2 + 8;

	ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);

	for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
		for (j = 0; j < type_ptr[1]; j++) {
			desc_ptr += 4;
			if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
			    type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
				continue;
			if (count++ == descriptor)
				return desc_ptr;
		}
	}
	return NULL;
}

/* For device slot and array device slot elements, byte 3 bit 6
 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
 * code stands these bits are shifted 4 positions right so in
 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
static void ses_get_fault(struct enclosure_device *edev,
			  struct enclosure_component *ecomp)
{
	unsigned char *desc;

	desc = ses_get_page2_descriptor(edev, ecomp);
	if (desc)
		ecomp->fault = (desc[3] & 0x60) >> 4;
}

static int ses_set_fault(struct enclosure_device *edev,
			  struct enclosure_component *ecomp,
			 enum enclosure_component_setting val)
{
	unsigned char desc[4];
	unsigned char *desc_ptr;

	desc_ptr = ses_get_page2_descriptor(edev, ecomp);

	if (!desc_ptr)
		return -EIO;

	init_device_slot_control(desc, ecomp, desc_ptr);

	switch (val) {
	case ENCLOSURE_SETTING_DISABLED:
		desc[3] &= 0xdf;
		break;
	case ENCLOSURE_SETTING_ENABLED:
		desc[3] |= 0x20;
		break;
	default:
		/* SES doesn't do the SGPIO blink settings */
		return -EINVAL;
	}

	return ses_set_page2_descriptor(edev, ecomp, desc);
}

static void ses_get_status(struct enclosure_device *edev,
			   struct enclosure_component *ecomp)
{
	unsigned char *desc;

	desc = ses_get_page2_descriptor(edev, ecomp);
	if (desc)
		ecomp->status = (desc[0] & 0x0f);
}

static void ses_get_locate(struct enclosure_device *edev,
			   struct enclosure_component *ecomp)
{
	unsigned char *desc;

	desc = ses_get_page2_descriptor(edev, ecomp);
	if (desc)
		ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
}

static int ses_set_locate(struct enclosure_device *edev,
			  struct enclosure_component *ecomp,
			  enum enclosure_component_setting val)
{
	unsigned char desc[4];
	unsigned char *desc_ptr;

	desc_ptr = ses_get_page2_descriptor(edev, ecomp);

	if (!desc_ptr)
		return -EIO;

	init_device_slot_control(desc, ecomp, desc_ptr);

	switch (val) {
	case ENCLOSURE_SETTING_DISABLED:
		desc[2] &= 0xfd;
		break;
	case ENCLOSURE_SETTING_ENABLED:
		desc[2] |= 0x02;
		break;
	default:
		/* SES doesn't do the SGPIO blink settings */
		return -EINVAL;
	}
	return ses_set_page2_descriptor(edev, ecomp, desc);
}

static int ses_set_active(struct enclosure_device *edev,
			  struct enclosure_component *ecomp,
			  enum enclosure_component_setting val)
{
	unsigned char desc[4];
	unsigned char *desc_ptr;

	desc_ptr = ses_get_page2_descriptor(edev, ecomp);

	if (!desc_ptr)
		return -EIO;

	init_device_slot_control(desc, ecomp, desc_ptr);

	switch (val) {
	case ENCLOSURE_SETTING_DISABLED:
		desc[2] &= 0x7f;
		ecomp->active = 0;
		break;
	case ENCLOSURE_SETTING_ENABLED:
		desc[2] |= 0x80;
		ecomp->active = 1;
		break;
	default:
		/* SES doesn't do the SGPIO blink settings */
		return -EINVAL;
	}
	return ses_set_page2_descriptor(edev, ecomp, desc);
}

static int ses_show_id(struct enclosure_device *edev, char *buf)
{
	struct ses_device *ses_dev = edev->scratch;
	unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);

	return sprintf(buf, "%#llx\n", id);
}

static void ses_get_power_status(struct enclosure_device *edev,
				 struct enclosure_component *ecomp)
{
	unsigned char *desc;

	desc = ses_get_page2_descriptor(edev, ecomp);
	if (desc)
		ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
}

static int ses_set_power_status(struct enclosure_device *edev,
				struct enclosure_component *ecomp,
				int val)
{
	unsigned char desc[4];
	unsigned char *desc_ptr;

	desc_ptr = ses_get_page2_descriptor(edev, ecomp);

	if (!desc_ptr)
		return -EIO;

	init_device_slot_control(desc, ecomp, desc_ptr);

	switch (val) {
	/* power = 1 is device_off = 0 and vice versa */
	case 0:
		desc[3] |= 0x10;
		break;
	case 1:
		desc[3] &= 0xef;
		break;
	default:
		return -EINVAL;
	}
	ecomp->power_status = val;
	return ses_set_page2_descriptor(edev, ecomp, desc);
}

static struct enclosure_component_callbacks ses_enclosure_callbacks = {
	.get_fault		= ses_get_fault,
	.set_fault		= ses_set_fault,
	.get_status		= ses_get_status,
	.get_locate		= ses_get_locate,
	.set_locate		= ses_set_locate,
	.get_power_status	= ses_get_power_status,
	.set_power_status	= ses_set_power_status,
	.set_active		= ses_set_active,
	.show_id		= ses_show_id,
};

struct ses_host_edev {
	struct Scsi_Host *shost;
	struct enclosure_device *edev;
};

#if 0
int ses_match_host(struct enclosure_device *edev, void *data)
{
	struct ses_host_edev *sed = data;
	struct scsi_device *sdev;

	if (!scsi_is_sdev_device(edev->edev.parent))
		return 0;

	sdev = to_scsi_device(edev->edev.parent);

	if (sdev->host != sed->shost)
		return 0;

	sed->edev = edev;
	return 1;
}
#endif  /*  0  */

static void ses_process_descriptor(struct enclosure_component *ecomp,
				   unsigned char *desc)
{
	int eip = desc[0] & 0x10;
	int invalid = desc[0] & 0x80;
	enum scsi_protocol proto = desc[0] & 0x0f;
	u64 addr = 0;
	int slot = -1;
	struct ses_component *scomp = ecomp->scratch;
	unsigned char *d;

	if (invalid)
		return;

	switch (proto) {
	case SCSI_PROTOCOL_FCP:
		if (eip) {
			d = desc + 4;
			slot = d[3];
		}
		break;
	case SCSI_PROTOCOL_SAS:
		if (eip) {
			d = desc + 4;
			slot = d[3];
			d = desc + 8;
		} else
			d = desc + 4;
		/* only take the phy0 addr */
		addr = (u64)d[12] << 56 |
			(u64)d[13] << 48 |
			(u64)d[14] << 40 |
			(u64)d[15] << 32 |
			(u64)d[16] << 24 |
			(u64)d[17] << 16 |
			(u64)d[18] << 8 |
			(u64)d[19];
		break;
	default:
		/* FIXME: Need to add more protocols than just SAS */
		break;
	}
	ecomp->slot = slot;
	scomp->addr = addr;
}

struct efd {
	u64 addr;
	struct device *dev;
};

static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
				      void *data)
{
	struct efd *efd = data;
	int i;
	struct ses_component *scomp;

	if (!edev->component[0].scratch)
		return 0;

	for (i = 0; i < edev->components; i++) {
		scomp = edev->component[i].scratch;
		if (scomp->addr != efd->addr)
			continue;

		if (enclosure_add_device(edev, i, efd->dev) == 0)
			kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
		return 1;
	}
	return 0;
}

#define INIT_ALLOC_SIZE 32

static void ses_enclosure_data_process(struct enclosure_device *edev,
				       struct scsi_device *sdev,
				       int create)
{
	u32 result;
	unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
	int i, j, page7_len, len, components;
	struct ses_device *ses_dev = edev->scratch;
	int types = ses_dev->page1_num_types;
	unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);

	if (!hdr_buf)
		goto simple_populate;

	/* re-read page 10 */
	if (ses_dev->page10)
		ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
	/* Page 7 for the descriptors is optional */
	result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
	if (result)
		goto simple_populate;

	page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
	/* add 1 for trailing '\0' we'll use */
	buf = kzalloc(len + 1, GFP_KERNEL);
	if (!buf)
		goto simple_populate;
	result = ses_recv_diag(sdev, 7, buf, len);
	if (result) {
 simple_populate:
		kfree(buf);
		buf = NULL;
		desc_ptr = NULL;
		len = 0;
		page7_len = 0;
	} else {
		desc_ptr = buf + 8;
		len = (desc_ptr[2] << 8) + desc_ptr[3];
		/* skip past overall descriptor */
		desc_ptr += len + 4;
	}
	if (ses_dev->page10)
		addl_desc_ptr = ses_dev->page10 + 8;
	type_ptr = ses_dev->page1_types;
	components = 0;
	for (i = 0; i < types; i++, type_ptr += 4) {
		for (j = 0; j < type_ptr[1]; j++) {
			char *name = NULL;
			struct enclosure_component *ecomp;

			if (desc_ptr) {
				if (desc_ptr >= buf + page7_len) {
					desc_ptr = NULL;
				} else {
					len = (desc_ptr[2] << 8) + desc_ptr[3];
					desc_ptr += 4;
					/* Add trailing zero - pushes into
					 * reserved space */
					desc_ptr[len] = '\0';
					name = desc_ptr;
				}
			}
			if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
			    type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {

				if (create)
					ecomp =	enclosure_component_alloc(
						edev,
						components++,
						type_ptr[0],
						name);
				else
					ecomp = &edev->component[components++];

				if (!IS_ERR(ecomp)) {
					ses_get_power_status(edev, ecomp);
					if (addl_desc_ptr)
						ses_process_descriptor(
							ecomp,
							addl_desc_ptr);
					if (create)
						enclosure_component_register(
							ecomp);
				}
			}
			if (desc_ptr)
				desc_ptr += len;

			if (addl_desc_ptr &&
			    /* only find additional descriptions for specific devices */
			    (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
			     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
			     type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
			     /* these elements are optional */
			     type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
			     type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
			     type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
				addl_desc_ptr += addl_desc_ptr[1] + 2;

		}
	}
	kfree(buf);
	kfree(hdr_buf);
}

static void ses_match_to_enclosure(struct enclosure_device *edev,
				   struct scsi_device *sdev)
{
	struct efd efd = {
		.addr = 0,
	};

	ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);

	if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
		efd.addr = sas_get_address(sdev);

	if (efd.addr) {
		efd.dev = &sdev->sdev_gendev;

		enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
	}
}

static int ses_intf_add(struct device *cdev,
			struct class_interface *intf)
{
	struct scsi_device *sdev = to_scsi_device(cdev->parent);
	struct scsi_device *tmp_sdev;
	unsigned char *buf = NULL, *hdr_buf, *type_ptr;
	struct ses_device *ses_dev;
	u32 result;
	int i, types, len, components = 0;
	int err = -ENOMEM;
	int num_enclosures;
	struct enclosure_device *edev;
	struct ses_component *scomp = NULL;

	if (!scsi_device_enclosure(sdev)) {
		/* not an enclosure, but might be in one */
		struct enclosure_device *prev = NULL;

		while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
			ses_match_to_enclosure(edev, sdev);
			prev = edev;
		}
		return -ENODEV;
	}

	/* TYPE_ENCLOSURE prints a message in probe */
	if (sdev->type != TYPE_ENCLOSURE)
		sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");

	ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
	hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
	if (!hdr_buf || !ses_dev)
		goto err_init_free;

	result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
	if (result)
		goto recv_failed;

	len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
	buf = kzalloc(len, GFP_KERNEL);
	if (!buf)
		goto err_free;

	result = ses_recv_diag(sdev, 1, buf, len);
	if (result)
		goto recv_failed;

	types = 0;

	/* we always have one main enclosure and the rest are referred
	 * to as secondary subenclosures */
	num_enclosures = buf[1] + 1;

	/* begin at the enclosure descriptor */
	type_ptr = buf + 8;
	/* skip all the enclosure descriptors */
	for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
		types += type_ptr[2];
		type_ptr += type_ptr[3] + 4;
	}

	ses_dev->page1_types = type_ptr;
	ses_dev->page1_num_types = types;

	for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
		if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
		    type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
			components += type_ptr[1];
	}
	ses_dev->page1 = buf;
	ses_dev->page1_len = len;
	buf = NULL;

	result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
	if (result)
		goto recv_failed;

	len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
	buf = kzalloc(len, GFP_KERNEL);
	if (!buf)
		goto err_free;

	/* make sure getting page 2 actually works */
	result = ses_recv_diag(sdev, 2, buf, len);
	if (result)
		goto recv_failed;
	ses_dev->page2 = buf;
	ses_dev->page2_len = len;
	buf = NULL;

	/* The additional information page --- allows us
	 * to match up the devices */
	result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
	if (!result) {

		len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
		buf = kzalloc(len, GFP_KERNEL);
		if (!buf)
			goto err_free;

		result = ses_recv_diag(sdev, 10, buf, len);
		if (result)
			goto recv_failed;
		ses_dev->page10 = buf;
		ses_dev->page10_len = len;
		buf = NULL;
	}
	scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
	if (!scomp)
		goto err_free;

	edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
				  components, &ses_enclosure_callbacks);
	if (IS_ERR(edev)) {
		err = PTR_ERR(edev);
		goto err_free;
	}

	kfree(hdr_buf);

	edev->scratch = ses_dev;
	for (i = 0; i < components; i++)
		edev->component[i].scratch = scomp + i;

	ses_enclosure_data_process(edev, sdev, 1);

	/* see if there are any devices matching before
	 * we found the enclosure */
	shost_for_each_device(tmp_sdev, sdev->host) {
		if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
			continue;
		ses_match_to_enclosure(edev, tmp_sdev);
	}

	return 0;

 recv_failed:
	sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
		    result);
	err = -ENODEV;
 err_free:
	kfree(buf);
	kfree(scomp);
	kfree(ses_dev->page10);
	kfree(ses_dev->page2);
	kfree(ses_dev->page1);
 err_init_free:
	kfree(ses_dev);
	kfree(hdr_buf);
	sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
	return err;
}

static int ses_remove(struct device *dev)
{
	return 0;
}

static void ses_intf_remove_component(struct scsi_device *sdev)
{
	struct enclosure_device *edev, *prev = NULL;

	while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
		prev = edev;
		if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
			break;
	}
	if (edev)
		put_device(&edev->edev);
}

static void ses_intf_remove_enclosure(struct scsi_device *sdev)
{
	struct enclosure_device *edev;
	struct ses_device *ses_dev;

	/*  exact match to this enclosure */
	edev = enclosure_find(&sdev->sdev_gendev, NULL);
	if (!edev)
		return;

	enclosure_unregister(edev);

	ses_dev = edev->scratch;
	edev->scratch = NULL;

	kfree(ses_dev->page10);
	kfree(ses_dev->page1);
	kfree(ses_dev->page2);
	kfree(ses_dev);

	kfree(edev->component[0].scratch);

	put_device(&edev->edev);
}

static void ses_intf_remove(struct device *cdev,
			    struct class_interface *intf)
{
	struct scsi_device *sdev = to_scsi_device(cdev->parent);

	if (!scsi_device_enclosure(sdev))
		ses_intf_remove_component(sdev);
	else
		ses_intf_remove_enclosure(sdev);
}

static struct class_interface ses_interface = {
	.add_dev	= ses_intf_add,
	.remove_dev	= ses_intf_remove,
};

static struct scsi_driver ses_template = {
	.gendrv = {
		.name		= "ses",
		.owner		= THIS_MODULE,
		.probe		= ses_probe,
		.remove		= ses_remove,
	},
};

static int __init ses_init(void)
{
	int err;

	err = scsi_register_interface(&ses_interface);
	if (err)
		return err;

	err = scsi_register_driver(&ses_template.gendrv);
	if (err)
		goto out_unreg;

	return 0;

 out_unreg:
	scsi_unregister_interface(&ses_interface);
	return err;
}

static void __exit ses_exit(void)
{
	scsi_unregister_driver(&ses_template.gendrv);
	scsi_unregister_interface(&ses_interface);
}

module_init(ses_init);
module_exit(ses_exit);

MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);

MODULE_AUTHOR("James Bottomley");
MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud