summaryrefslogtreecommitdiff
path: root/drivers/usb/host/hwa-hc.c
blob: da3b18038d2317ac362a15f583badc517ee9060b (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
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
/*
 * Host Wire Adapter:
 * Driver glue, HWA-specific functions, bridges to WAHC and WUSBHC
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * The HWA driver is a simple layer that forwards requests to the WAHC
 * (Wire Adater Host Controller) or WUSBHC (Wireless USB Host
 * Controller) layers.
 *
 * Host Wire Adapter is the 'WUSB 1.0 standard' name for Wireless-USB
 * Host Controller that is connected to your system via USB (a USB
 * dongle that implements a USB host...). There is also a Device Wired
 * Adaptor, DWA (Wireless USB hub) that uses the same mechanism for
 * transferring data (it is after all a USB host connected via
 * Wireless USB), we have a common layer called Wire Adapter Host
 * Controller that does all the hard work. The WUSBHC (Wireless USB
 * Host Controller) is the part common to WUSB Host Controllers, the
 * HWA and the PCI-based one, that is implemented following the WHCI
 * spec. All these layers are implemented in ../wusbcore.
 *
 * The main functions are hwahc_op_urb_{en,de}queue(), that pass the
 * job of converting a URB to a Wire Adapter
 *
 * Entry points:
 *
 *   hwahc_driver_*()   Driver initialization, registration and
 *                      teardown.
 *
 *   hwahc_probe()	New device came up, create an instance for
 *                      it [from device enumeration].
 *
 *   hwahc_disconnect()	Remove device instance [from device
 *                      enumeration].
 *
 *   [__]hwahc_op_*()   Host-Wire-Adaptor specific functions for
 *                      starting/stopping/etc (some might be made also
 *                      DWA).
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include "../wusbcore/wa-hc.h"
#include "../wusbcore/wusbhc.h"

struct hwahc {
	struct wusbhc wusbhc;	/* has to be 1st */
	struct wahc wa;
};

/*
 * FIXME should be wusbhc
 *
 * NOTE: we need to cache the Cluster ID because later...there is no
 *       way to get it :)
 */
static int __hwahc_set_cluster_id(struct hwahc *hwahc, u8 cluster_id)
{
	int result;
	struct wusbhc *wusbhc = &hwahc->wusbhc;
	struct wahc *wa = &hwahc->wa;
	struct device *dev = &wa->usb_iface->dev;

	result = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_SET_CLUSTER_ID,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			cluster_id,
			wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
			NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (result < 0)
		dev_err(dev, "Cannot set WUSB Cluster ID to 0x%02x: %d\n",
			cluster_id, result);
	else
		wusbhc->cluster_id = cluster_id;
	dev_info(dev, "Wireless USB Cluster ID set to 0x%02x\n", cluster_id);
	return result;
}

static int __hwahc_op_set_num_dnts(struct wusbhc *wusbhc, u8 interval, u8 slots)
{
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;

	return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_SET_NUM_DNTS,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			interval << 8 | slots,
			wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
			NULL, 0, USB_CTRL_SET_TIMEOUT);
}

/*
 * Reset a WUSB host controller and wait for it to complete doing it.
 *
 * @usb_hcd:	Pointer to WUSB Host Controller instance.
 *
 */
static int hwahc_op_reset(struct usb_hcd *usb_hcd)
{
	int result;
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct device *dev = &hwahc->wa.usb_iface->dev;

	mutex_lock(&wusbhc->mutex);
	wa_nep_disarm(&hwahc->wa);
	result = __wa_set_feature(&hwahc->wa, WA_RESET);
	if (result < 0) {
		dev_err(dev, "error commanding HC to reset: %d\n", result);
		goto error_unlock;
	}
	result = __wa_wait_status(&hwahc->wa, WA_STATUS_RESETTING, 0);
	if (result < 0) {
		dev_err(dev, "error waiting for HC to reset: %d\n", result);
		goto error_unlock;
	}
error_unlock:
	mutex_unlock(&wusbhc->mutex);
	return result;
}

/*
 * FIXME: break this function up
 */
static int hwahc_op_start(struct usb_hcd *usb_hcd)
{
	u8 addr;
	int result;
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);

	result = -ENOSPC;
	mutex_lock(&wusbhc->mutex);
	addr = wusb_cluster_id_get();
	if (addr == 0)
		goto error_cluster_id_get;
	result = __hwahc_set_cluster_id(hwahc, addr);
	if (result < 0)
		goto error_set_cluster_id;

	usb_hcd->uses_new_polling = 1;
	set_bit(HCD_FLAG_POLL_RH, &usb_hcd->flags);
	usb_hcd->state = HC_STATE_RUNNING;

	/*
	 * prevent USB core from suspending the root hub since
	 * bus_suspend and bus_resume are not yet supported.
	 */
	pm_runtime_get_noresume(&usb_hcd->self.root_hub->dev);

	result = 0;
out:
	mutex_unlock(&wusbhc->mutex);
	return result;

error_set_cluster_id:
	wusb_cluster_id_put(wusbhc->cluster_id);
error_cluster_id_get:
	goto out;

}

/*
 * No need to abort pipes, as when this is called, all the children
 * has been disconnected and that has done it [through
 * usb_disable_interface() -> usb_disable_endpoint() ->
 * hwahc_op_ep_disable() - >rpipe_ep_disable()].
 */
static void hwahc_op_stop(struct usb_hcd *usb_hcd)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);

	mutex_lock(&wusbhc->mutex);
	wusb_cluster_id_put(wusbhc->cluster_id);
	mutex_unlock(&wusbhc->mutex);
}

static int hwahc_op_get_frame_number(struct usb_hcd *usb_hcd)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;

	/*
	 * We cannot query the HWA for the WUSB time since that requires sending
	 * a synchronous URB and this function can be called in_interrupt.
	 * Instead, query the USB frame number for our parent and use that.
	 */
	return usb_get_current_frame_number(wa->usb_dev);
}

static int hwahc_op_urb_enqueue(struct usb_hcd *usb_hcd, struct urb *urb,
				gfp_t gfp)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);

	return wa_urb_enqueue(&hwahc->wa, urb->ep, urb, gfp);
}

static int hwahc_op_urb_dequeue(struct usb_hcd *usb_hcd, struct urb *urb,
				int status)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);

	return wa_urb_dequeue(&hwahc->wa, urb, status);
}

/*
 * Release resources allocated for an endpoint
 *
 * If there is an associated rpipe to this endpoint, go ahead and put it.
 */
static void hwahc_op_endpoint_disable(struct usb_hcd *usb_hcd,
				      struct usb_host_endpoint *ep)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);

	rpipe_ep_disable(&hwahc->wa, ep);
}

static int __hwahc_op_wusbhc_start(struct wusbhc *wusbhc)
{
	int result;
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct device *dev = &hwahc->wa.usb_iface->dev;

	result = __wa_set_feature(&hwahc->wa, WA_ENABLE);
	if (result < 0) {
		dev_err(dev, "error commanding HC to start: %d\n", result);
		goto error_stop;
	}
	result = __wa_wait_status(&hwahc->wa, WA_ENABLE, WA_ENABLE);
	if (result < 0) {
		dev_err(dev, "error waiting for HC to start: %d\n", result);
		goto error_stop;
	}
	result = wa_nep_arm(&hwahc->wa, GFP_KERNEL);
	if (result < 0) {
		dev_err(dev, "cannot listen to notifications: %d\n", result);
		goto error_stop;
	}
	/*
	 * If WUSB_QUIRK_ALEREON_HWA_DISABLE_XFER_NOTIFICATIONS is set,
	 *  disable transfer notifications.
	 */
	if (hwahc->wa.quirks &
		WUSB_QUIRK_ALEREON_HWA_DISABLE_XFER_NOTIFICATIONS) {
		struct usb_host_interface *cur_altsetting =
			hwahc->wa.usb_iface->cur_altsetting;

		result = usb_control_msg(hwahc->wa.usb_dev,
				usb_sndctrlpipe(hwahc->wa.usb_dev, 0),
				WA_REQ_ALEREON_DISABLE_XFER_NOTIFICATIONS,
				USB_DIR_OUT | USB_TYPE_VENDOR |
					USB_RECIP_INTERFACE,
				WA_REQ_ALEREON_FEATURE_SET,
				cur_altsetting->desc.bInterfaceNumber,
				NULL, 0,
				USB_CTRL_SET_TIMEOUT);
		/*
		 * If we successfully sent the control message, start DTI here
		 * because no transfer notifications will be received which is
		 * where DTI is normally started.
		 */
		if (result == 0)
			result = wa_dti_start(&hwahc->wa);
		else
			result = 0;	/* OK.  Continue normally. */

		if (result < 0) {
			dev_err(dev, "cannot start DTI: %d\n", result);
			goto error_dti_start;
		}
	}

	return result;

error_dti_start:
	wa_nep_disarm(&hwahc->wa);
error_stop:
	__wa_clear_feature(&hwahc->wa, WA_ENABLE);
	return result;
}

static void __hwahc_op_wusbhc_stop(struct wusbhc *wusbhc, int delay)
{
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	u8 iface_no = wa->usb_iface->cur_altsetting->desc.bInterfaceNumber;
	int ret;

	ret = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			      WUSB_REQ_CHAN_STOP,
			      USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			      delay * 1000,
			      iface_no,
			      NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (ret == 0)
		msleep(delay);

	wa_nep_disarm(&hwahc->wa);
	__wa_stop(&hwahc->wa);
}

/*
 * Set the UWB MAS allocation for the WUSB cluster
 *
 * @stream_index: stream to use (-1 for cancelling the allocation)
 * @mas: mas bitmap to use
 */
static int __hwahc_op_bwa_set(struct wusbhc *wusbhc, s8 stream_index,
			      const struct uwb_mas_bm *mas)
{
	int result;
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	struct device *dev = &wa->usb_iface->dev;
	u8 mas_le[UWB_NUM_MAS/8];

	/* Set the stream index */
	result = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_SET_STREAM_IDX,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			stream_index,
			wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
			NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (result < 0) {
		dev_err(dev, "Cannot set WUSB stream index: %d\n", result);
		goto out;
	}
	uwb_mas_bm_copy_le(mas_le, mas);
	/* Set the MAS allocation */
	result = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_SET_WUSB_MAS,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			0, wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
			mas_le, 32, USB_CTRL_SET_TIMEOUT);
	if (result < 0)
		dev_err(dev, "Cannot set WUSB MAS allocation: %d\n", result);
out:
	return result;
}

/*
 * Add an IE to the host's MMC
 *
 * @interval:    See WUSB1.0[8.5.3.1]
 * @repeat_cnt:  See WUSB1.0[8.5.3.1]
 * @handle:      See WUSB1.0[8.5.3.1]
 * @wuie:        Pointer to the header of the WUSB IE data to add.
 *               MUST BE allocated in a kmalloc buffer (no stack or
 *               vmalloc).
 *
 * NOTE: the format of the WUSB IEs for MMCs are different to the
 *       normal MBOA MAC IEs (IE Id + Length in MBOA MAC vs. Length +
 *       Id in WUSB IEs). Standards...you gotta love'em.
 */
static int __hwahc_op_mmcie_add(struct wusbhc *wusbhc, u8 interval,
				u8 repeat_cnt, u8 handle,
				struct wuie_hdr *wuie)
{
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	u8 iface_no = wa->usb_iface->cur_altsetting->desc.bInterfaceNumber;

	return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_ADD_MMC_IE,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			interval << 8 | repeat_cnt,
			handle << 8 | iface_no,
			wuie, wuie->bLength, USB_CTRL_SET_TIMEOUT);
}

/*
 * Remove an IE to the host's MMC
 *
 * @handle:      See WUSB1.0[8.5.3.1]
 */
static int __hwahc_op_mmcie_rm(struct wusbhc *wusbhc, u8 handle)
{
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	u8 iface_no = wa->usb_iface->cur_altsetting->desc.bInterfaceNumber;
	return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_REMOVE_MMC_IE,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			0, handle << 8 | iface_no,
			NULL, 0, USB_CTRL_SET_TIMEOUT);
}

/*
 * Update device information for a given fake port
 *
 * @port_idx: Fake port to which device is connected (wusbhc index, not
 *            USB port number).
 */
static int __hwahc_op_dev_info_set(struct wusbhc *wusbhc,
				   struct wusb_dev *wusb_dev)
{
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	u8 iface_no = wa->usb_iface->cur_altsetting->desc.bInterfaceNumber;
	struct hwa_dev_info *dev_info;
	int ret;

	/* fill out the Device Info buffer and send it */
	dev_info = kzalloc(sizeof(struct hwa_dev_info), GFP_KERNEL);
	if (!dev_info)
		return -ENOMEM;
	uwb_mas_bm_copy_le(dev_info->bmDeviceAvailability,
			   &wusb_dev->availability);
	dev_info->bDeviceAddress = wusb_dev->addr;

	/*
	 * If the descriptors haven't been read yet, use a default PHY
	 * rate of 53.3 Mbit/s only.  The correct value will be used
	 * when this will be called again as part of the
	 * authentication process (which occurs after the descriptors
	 * have been read).
	 */
	if (wusb_dev->wusb_cap_descr)
		dev_info->wPHYRates = wusb_dev->wusb_cap_descr->wPHYRates;
	else
		dev_info->wPHYRates = cpu_to_le16(USB_WIRELESS_PHY_53);

	ret = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			WUSB_REQ_SET_DEV_INFO,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			0, wusb_dev->port_idx << 8 | iface_no,
			dev_info, sizeof(struct hwa_dev_info),
			USB_CTRL_SET_TIMEOUT);
	kfree(dev_info);
	return ret;
}

/*
 * Set host's idea of which encryption (and key) method to use when
 * talking to ad evice on a given port.
 *
 * If key is NULL, it means disable encryption for that "virtual port"
 * (used when we disconnect).
 */
static int __hwahc_dev_set_key(struct wusbhc *wusbhc, u8 port_idx, u32 tkid,
			       const void *key, size_t key_size,
			       u8 key_idx)
{
	int result = -ENOMEM;
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	u8 iface_no = wa->usb_iface->cur_altsetting->desc.bInterfaceNumber;
	struct usb_key_descriptor *keyd;
	size_t keyd_len;

	keyd_len = sizeof(*keyd) + key_size;
	keyd = kzalloc(keyd_len, GFP_KERNEL);
	if (keyd == NULL)
		return -ENOMEM;

	keyd->bLength = keyd_len;
	keyd->bDescriptorType = USB_DT_KEY;
	keyd->tTKID[0] = (tkid >>  0) & 0xff;
	keyd->tTKID[1] = (tkid >>  8) & 0xff;
	keyd->tTKID[2] = (tkid >> 16) & 0xff;
	memcpy(keyd->bKeyData, key, key_size);

	result = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			USB_REQ_SET_DESCRIPTOR,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			USB_DT_KEY << 8 | key_idx,
			port_idx << 8 | iface_no,
			keyd, keyd_len, USB_CTRL_SET_TIMEOUT);

	kzfree(keyd); /* clear keys etc. */
	return result;
}

/*
 * Set host's idea of which encryption (and key) method to use when
 * talking to ad evice on a given port.
 *
 * If key is NULL, it means disable encryption for that "virtual port"
 * (used when we disconnect).
 */
static int __hwahc_op_set_ptk(struct wusbhc *wusbhc, u8 port_idx, u32 tkid,
			      const void *key, size_t key_size)
{
	int result = -ENOMEM;
	struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	struct wahc *wa = &hwahc->wa;
	u8 iface_no = wa->usb_iface->cur_altsetting->desc.bInterfaceNumber;
	u8 encryption_value;

	/* Tell the host which key to use to talk to the device */
	if (key) {
		u8 key_idx = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_PTK,
					    WUSB_KEY_INDEX_ORIGINATOR_HOST);

		result = __hwahc_dev_set_key(wusbhc, port_idx, tkid,
					     key, key_size, key_idx);
		if (result < 0)
			goto error_set_key;
		encryption_value = wusbhc->ccm1_etd->bEncryptionValue;
	} else {
		/* FIXME: this should come from wusbhc->etd[UNSECURE].value */
		encryption_value = 0;
	}

	/* Set the encryption type for communicating with the device */
	result = usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
			USB_REQ_SET_ENCRYPTION,
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			encryption_value, port_idx << 8 | iface_no,
			NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (result < 0)
		dev_err(wusbhc->dev, "Can't set host's WUSB encryption for "
			"port index %u to %s (value %d): %d\n", port_idx,
			wusb_et_name(wusbhc->ccm1_etd->bEncryptionType),
			wusbhc->ccm1_etd->bEncryptionValue, result);
error_set_key:
	return result;
}

/*
 * Set host's GTK key
 */
static int __hwahc_op_set_gtk(struct wusbhc *wusbhc, u32 tkid,
			      const void *key, size_t key_size)
{
	u8 key_idx = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_GTK,
				    WUSB_KEY_INDEX_ORIGINATOR_HOST);

	return __hwahc_dev_set_key(wusbhc, 0, tkid, key, key_size, key_idx);
}

/*
 * Get the Wire Adapter class-specific descriptor
 *
 * NOTE: this descriptor comes with the big bundled configuration
 *       descriptor that includes the interfaces' and endpoints', so
 *       we just look for it in the cached copy kept by the USB stack.
 *
 * NOTE2: We convert LE fields to CPU order.
 */
static int wa_fill_descr(struct wahc *wa)
{
	int result;
	struct device *dev = &wa->usb_iface->dev;
	char *itr;
	struct usb_device *usb_dev = wa->usb_dev;
	struct usb_descriptor_header *hdr;
	struct usb_wa_descriptor *wa_descr;
	size_t itr_size, actconfig_idx;

	actconfig_idx = (usb_dev->actconfig - usb_dev->config) /
			sizeof(usb_dev->config[0]);
	itr = usb_dev->rawdescriptors[actconfig_idx];
	itr_size = le16_to_cpu(usb_dev->actconfig->desc.wTotalLength);
	while (itr_size >= sizeof(*hdr)) {
		hdr = (struct usb_descriptor_header *) itr;
		dev_dbg(dev, "Extra device descriptor: "
			"type %02x/%u bytes @ %zu (%zu left)\n",
			hdr->bDescriptorType, hdr->bLength,
			(itr - usb_dev->rawdescriptors[actconfig_idx]),
			itr_size);
		if (hdr->bDescriptorType == USB_DT_WIRE_ADAPTER)
			goto found;
		itr += hdr->bLength;
		itr_size -= hdr->bLength;
	}
	dev_err(dev, "cannot find Wire Adapter Class descriptor\n");
	return -ENODEV;

found:
	result = -EINVAL;
	if (hdr->bLength > itr_size) {	/* is it available? */
		dev_err(dev, "incomplete Wire Adapter Class descriptor "
			"(%zu bytes left, %u needed)\n",
			itr_size, hdr->bLength);
		goto error;
	}
	if (hdr->bLength < sizeof(*wa->wa_descr)) {
		dev_err(dev, "short Wire Adapter Class descriptor\n");
		goto error;
	}
	wa->wa_descr = wa_descr = (struct usb_wa_descriptor *) hdr;
	if (le16_to_cpu(wa_descr->bcdWAVersion) > 0x0100)
		dev_warn(dev, "Wire Adapter v%d.%d newer than groked v1.0\n",
			 (le16_to_cpu(wa_descr->bcdWAVersion) & 0xff00) >> 8,
			 le16_to_cpu(wa_descr->bcdWAVersion) & 0x00ff);
	result = 0;
error:
	return result;
}

static const struct hc_driver hwahc_hc_driver = {
	.description = "hwa-hcd",
	.product_desc = "Wireless USB HWA host controller",
	.hcd_priv_size = sizeof(struct hwahc) - sizeof(struct usb_hcd),
	.irq = NULL,			/* FIXME */
	.flags = HCD_USB25,
	.reset = hwahc_op_reset,
	.start = hwahc_op_start,
	.stop = hwahc_op_stop,
	.get_frame_number = hwahc_op_get_frame_number,
	.urb_enqueue = hwahc_op_urb_enqueue,
	.urb_dequeue = hwahc_op_urb_dequeue,
	.endpoint_disable = hwahc_op_endpoint_disable,

	.hub_status_data = wusbhc_rh_status_data,
	.hub_control = wusbhc_rh_control,
	.start_port_reset = wusbhc_rh_start_port_reset,
};

static int hwahc_security_create(struct hwahc *hwahc)
{
	int result;
	struct wusbhc *wusbhc = &hwahc->wusbhc;
	struct usb_device *usb_dev = hwahc->wa.usb_dev;
	struct device *dev = &usb_dev->dev;
	struct usb_security_descriptor *secd;
	struct usb_encryption_descriptor *etd;
	void *itr, *top;
	size_t itr_size, needed, bytes;
	u8 index;
	char buf[64];

	/* Find the host's security descriptors in the config descr bundle */
	index = (usb_dev->actconfig - usb_dev->config) /
		sizeof(usb_dev->config[0]);
	itr = usb_dev->rawdescriptors[index];
	itr_size = le16_to_cpu(usb_dev->actconfig->desc.wTotalLength);
	top = itr + itr_size;
	result = __usb_get_extra_descriptor(usb_dev->rawdescriptors[index],
			le16_to_cpu(usb_dev->actconfig->desc.wTotalLength),
			USB_DT_SECURITY, (void **) &secd);
	if (result == -1) {
		dev_warn(dev, "BUG? WUSB host has no security descriptors\n");
		return 0;
	}
	needed = sizeof(*secd);
	if (top - (void *)secd < needed) {
		dev_err(dev, "BUG? Not enough data to process security "
			"descriptor header (%zu bytes left vs %zu needed)\n",
			top - (void *) secd, needed);
		return 0;
	}
	needed = le16_to_cpu(secd->wTotalLength);
	if (top - (void *)secd < needed) {
		dev_err(dev, "BUG? Not enough data to process security "
			"descriptors (%zu bytes left vs %zu needed)\n",
			top - (void *) secd, needed);
		return 0;
	}
	/* Walk over the sec descriptors and store CCM1's on wusbhc */
	itr = (void *) secd + sizeof(*secd);
	top = (void *) secd + le16_to_cpu(secd->wTotalLength);
	index = 0;
	bytes = 0;
	while (itr < top) {
		etd = itr;
		if (top - itr < sizeof(*etd)) {
			dev_err(dev, "BUG: bad host security descriptor; "
				"not enough data (%zu vs %zu left)\n",
				top - itr, sizeof(*etd));
			break;
		}
		if (etd->bLength < sizeof(*etd)) {
			dev_err(dev, "BUG: bad host encryption descriptor; "
				"descriptor is too short "
				"(%zu vs %zu needed)\n",
				(size_t)etd->bLength, sizeof(*etd));
			break;
		}
		itr += etd->bLength;
		bytes += snprintf(buf + bytes, sizeof(buf) - bytes,
				  "%s (0x%02x) ",
				  wusb_et_name(etd->bEncryptionType),
				  etd->bEncryptionValue);
		wusbhc->ccm1_etd = etd;
	}
	dev_info(dev, "supported encryption types: %s\n", buf);
	if (wusbhc->ccm1_etd == NULL) {
		dev_err(dev, "E: host doesn't support CCM-1 crypto\n");
		return 0;
	}
	/* Pretty print what we support */
	return 0;
}

static void hwahc_security_release(struct hwahc *hwahc)
{
	/* nothing to do here so far... */
}

static int hwahc_create(struct hwahc *hwahc, struct usb_interface *iface,
	kernel_ulong_t quirks)
{
	int result;
	struct device *dev = &iface->dev;
	struct wusbhc *wusbhc = &hwahc->wusbhc;
	struct wahc *wa = &hwahc->wa;
	struct usb_device *usb_dev = interface_to_usbdev(iface);

	wa->usb_dev = usb_get_dev(usb_dev);	/* bind the USB device */
	wa->usb_iface = usb_get_intf(iface);
	wusbhc->dev = dev;
	/* defer getting the uwb_rc handle until it is needed since it
	 * may not have been registered by the hwa_rc driver yet. */
	wusbhc->uwb_rc = NULL;
	result = wa_fill_descr(wa);	/* Get the device descriptor */
	if (result < 0)
		goto error_fill_descriptor;
	if (wa->wa_descr->bNumPorts > USB_MAXCHILDREN) {
		dev_err(dev, "FIXME: USB_MAXCHILDREN too low for WUSB "
			"adapter (%u ports)\n", wa->wa_descr->bNumPorts);
		wusbhc->ports_max = USB_MAXCHILDREN;
	} else {
		wusbhc->ports_max = wa->wa_descr->bNumPorts;
	}
	wusbhc->mmcies_max = wa->wa_descr->bNumMMCIEs;
	wusbhc->start = __hwahc_op_wusbhc_start;
	wusbhc->stop = __hwahc_op_wusbhc_stop;
	wusbhc->mmcie_add = __hwahc_op_mmcie_add;
	wusbhc->mmcie_rm = __hwahc_op_mmcie_rm;
	wusbhc->dev_info_set = __hwahc_op_dev_info_set;
	wusbhc->bwa_set = __hwahc_op_bwa_set;
	wusbhc->set_num_dnts = __hwahc_op_set_num_dnts;
	wusbhc->set_ptk = __hwahc_op_set_ptk;
	wusbhc->set_gtk = __hwahc_op_set_gtk;
	result = hwahc_security_create(hwahc);
	if (result < 0) {
		dev_err(dev, "Can't initialize security: %d\n", result);
		goto error_security_create;
	}
	wa->wusb = wusbhc;	/* FIXME: ugly, need to fix */
	result = wusbhc_create(&hwahc->wusbhc);
	if (result < 0) {
		dev_err(dev, "Can't create WUSB HC structures: %d\n", result);
		goto error_wusbhc_create;
	}
	result = wa_create(&hwahc->wa, iface, quirks);
	if (result < 0)
		goto error_wa_create;
	return 0;

error_wa_create:
	wusbhc_destroy(&hwahc->wusbhc);
error_wusbhc_create:
	/* WA Descr fill allocs no resources */
error_security_create:
error_fill_descriptor:
	usb_put_intf(iface);
	usb_put_dev(usb_dev);
	return result;
}

static void hwahc_destroy(struct hwahc *hwahc)
{
	struct wusbhc *wusbhc = &hwahc->wusbhc;

	mutex_lock(&wusbhc->mutex);
	__wa_destroy(&hwahc->wa);
	wusbhc_destroy(&hwahc->wusbhc);
	hwahc_security_release(hwahc);
	hwahc->wusbhc.dev = NULL;
	uwb_rc_put(wusbhc->uwb_rc);
	usb_put_intf(hwahc->wa.usb_iface);
	usb_put_dev(hwahc->wa.usb_dev);
	mutex_unlock(&wusbhc->mutex);
}

static void hwahc_init(struct hwahc *hwahc)
{
	wa_init(&hwahc->wa);
}

static int hwahc_probe(struct usb_interface *usb_iface,
		       const struct usb_device_id *id)
{
	int result;
	struct usb_hcd *usb_hcd;
	struct wusbhc *wusbhc;
	struct hwahc *hwahc;
	struct device *dev = &usb_iface->dev;

	result = -ENOMEM;
	usb_hcd = usb_create_hcd(&hwahc_hc_driver, &usb_iface->dev, "wusb-hwa");
	if (usb_hcd == NULL) {
		dev_err(dev, "unable to allocate instance\n");
		goto error_alloc;
	}
	usb_hcd->wireless = 1;
	usb_hcd->self.sg_tablesize = ~0;
	wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	hwahc = container_of(wusbhc, struct hwahc, wusbhc);
	hwahc_init(hwahc);
	result = hwahc_create(hwahc, usb_iface, id->driver_info);
	if (result < 0) {
		dev_err(dev, "Cannot initialize internals: %d\n", result);
		goto error_hwahc_create;
	}
	result = usb_add_hcd(usb_hcd, 0, 0);
	if (result < 0) {
		dev_err(dev, "Cannot add HCD: %d\n", result);
		goto error_add_hcd;
	}
	device_wakeup_enable(usb_hcd->self.controller);
	result = wusbhc_b_create(&hwahc->wusbhc);
	if (result < 0) {
		dev_err(dev, "Cannot setup phase B of WUSBHC: %d\n", result);
		goto error_wusbhc_b_create;
	}
	return 0;

error_wusbhc_b_create:
	usb_remove_hcd(usb_hcd);
error_add_hcd:
	hwahc_destroy(hwahc);
error_hwahc_create:
	usb_put_hcd(usb_hcd);
error_alloc:
	return result;
}

static void hwahc_disconnect(struct usb_interface *usb_iface)
{
	struct usb_hcd *usb_hcd;
	struct wusbhc *wusbhc;
	struct hwahc *hwahc;

	usb_hcd = usb_get_intfdata(usb_iface);
	wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	hwahc = container_of(wusbhc, struct hwahc, wusbhc);

	wusbhc_b_destroy(&hwahc->wusbhc);
	usb_remove_hcd(usb_hcd);
	hwahc_destroy(hwahc);
	usb_put_hcd(usb_hcd);
}

static const struct usb_device_id hwahc_id_table[] = {
	/* Alereon 5310 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x13dc, 0x5310, 0xe0, 0x02, 0x01),
	  .driver_info = WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC |
		WUSB_QUIRK_ALEREON_HWA_DISABLE_XFER_NOTIFICATIONS },
	/* Alereon 5611 */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x13dc, 0x5611, 0xe0, 0x02, 0x01),
	  .driver_info = WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC |
		WUSB_QUIRK_ALEREON_HWA_DISABLE_XFER_NOTIFICATIONS },
	/* FIXME: use class labels for this */
	{ USB_INTERFACE_INFO(0xe0, 0x02, 0x01), },
	{},
};
MODULE_DEVICE_TABLE(usb, hwahc_id_table);

static struct usb_driver hwahc_driver = {
	.name =		"hwa-hc",
	.probe =	hwahc_probe,
	.disconnect =	hwahc_disconnect,
	.id_table =	hwahc_id_table,
};

module_usb_driver(hwahc_driver);

MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
MODULE_DESCRIPTION("Host Wired Adapter USB Host Control Driver");
MODULE_LICENSE("GPL");