summaryrefslogtreecommitdiff
path: root/drivers/usb/mtu3/mtu3_gadget.c
blob: 9977600616d7ea1957dac214691d8b8844df1d2d (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
// SPDX-License-Identifier: GPL-2.0
/*
 * mtu3_gadget.c - MediaTek usb3 DRD peripheral support
 *
 * Copyright (C) 2016 MediaTek Inc.
 *
 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
 */

#include "mtu3.h"
#include "mtu3_trace.h"

void mtu3_req_complete(struct mtu3_ep *mep,
		     struct usb_request *req, int status)
__releases(mep->mtu->lock)
__acquires(mep->mtu->lock)
{
	struct mtu3_request *mreq = to_mtu3_request(req);
	struct mtu3 *mtu = mreq->mtu;

	list_del(&mreq->list);
	if (req->status == -EINPROGRESS)
		req->status = status;

	trace_mtu3_req_complete(mreq);
	spin_unlock(&mtu->lock);

	/* ep0 makes use of PIO, needn't unmap it */
	if (mep->epnum)
		usb_gadget_unmap_request(&mtu->g, req, mep->is_in);

	dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
		mep->name, req, req->status, req->actual, req->length);

	usb_gadget_giveback_request(&mep->ep, req);
	spin_lock(&mtu->lock);
}

static void nuke(struct mtu3_ep *mep, const int status)
{
	struct mtu3_request *mreq = NULL;

	if (list_empty(&mep->req_list))
		return;

	dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);

	/* exclude EP0 */
	if (mep->epnum)
		mtu3_qmu_flush(mep);

	while (!list_empty(&mep->req_list)) {
		mreq = list_first_entry(&mep->req_list,
					struct mtu3_request, list);
		mtu3_req_complete(mep, &mreq->request, status);
	}
}

static int mtu3_ep_enable(struct mtu3_ep *mep)
{
	const struct usb_endpoint_descriptor *desc;
	const struct usb_ss_ep_comp_descriptor *comp_desc;
	struct mtu3 *mtu = mep->mtu;
	u32 interval = 0;
	u32 mult = 0;
	u32 burst = 0;
	int ret;

	desc = mep->desc;
	comp_desc = mep->comp_desc;
	mep->type = usb_endpoint_type(desc);
	mep->maxp = usb_endpoint_maxp(desc);

	switch (mtu->g.speed) {
	case USB_SPEED_SUPER:
	case USB_SPEED_SUPER_PLUS:
		if (usb_endpoint_xfer_int(desc) ||
				usb_endpoint_xfer_isoc(desc)) {
			interval = desc->bInterval;
			interval = clamp_val(interval, 1, 16);
			if (usb_endpoint_xfer_isoc(desc) && comp_desc)
				mult = comp_desc->bmAttributes;
		}
		if (comp_desc)
			burst = comp_desc->bMaxBurst;

		break;
	case USB_SPEED_HIGH:
		if (usb_endpoint_xfer_isoc(desc) ||
				usb_endpoint_xfer_int(desc)) {
			interval = desc->bInterval;
			interval = clamp_val(interval, 1, 16);
			mult = usb_endpoint_maxp_mult(desc) - 1;
		}
		break;
	case USB_SPEED_FULL:
		if (usb_endpoint_xfer_isoc(desc))
			interval = clamp_val(desc->bInterval, 1, 16);
		else if (usb_endpoint_xfer_int(desc))
			interval = clamp_val(desc->bInterval, 1, 255);

		break;
	default:
		break; /*others are ignored */
	}

	dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
		__func__, mep->maxp, interval, burst, mult);

	mep->ep.maxpacket = mep->maxp;
	mep->ep.desc = desc;
	mep->ep.comp_desc = comp_desc;

	/* slot mainly affects bulk/isoc transfer, so ignore int */
	mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;

	ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
	if (ret < 0)
		return ret;

	ret = mtu3_gpd_ring_alloc(mep);
	if (ret < 0) {
		mtu3_deconfig_ep(mtu, mep);
		return ret;
	}

	mtu3_qmu_start(mep);

	return 0;
}

static int mtu3_ep_disable(struct mtu3_ep *mep)
{
	struct mtu3 *mtu = mep->mtu;

	mtu3_qmu_stop(mep);

	/* abort all pending requests */
	nuke(mep, -ESHUTDOWN);
	mtu3_deconfig_ep(mtu, mep);
	mtu3_gpd_ring_free(mep);

	mep->desc = NULL;
	mep->ep.desc = NULL;
	mep->comp_desc = NULL;
	mep->type = 0;
	mep->flags = 0;

	return 0;
}

static int mtu3_gadget_ep_enable(struct usb_ep *ep,
		const struct usb_endpoint_descriptor *desc)
{
	struct mtu3_ep *mep;
	struct mtu3 *mtu;
	unsigned long flags;
	int ret = -EINVAL;

	if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
		pr_debug("%s invalid parameters\n", __func__);
		return -EINVAL;
	}

	if (!desc->wMaxPacketSize) {
		pr_debug("%s missing wMaxPacketSize\n", __func__);
		return -EINVAL;
	}
	mep = to_mtu3_ep(ep);
	mtu = mep->mtu;

	/* check ep number and direction against endpoint */
	if (usb_endpoint_num(desc) != mep->epnum)
		return -EINVAL;

	if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
		return -EINVAL;

	dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);

	if (mep->flags & MTU3_EP_ENABLED) {
		dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
				mep->name);
		return 0;
	}

	spin_lock_irqsave(&mtu->lock, flags);
	mep->desc = desc;
	mep->comp_desc = ep->comp_desc;

	ret = mtu3_ep_enable(mep);
	if (ret)
		goto error;

	mep->flags = MTU3_EP_ENABLED;
	mtu->active_ep++;

error:
	spin_unlock_irqrestore(&mtu->lock, flags);

	dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
	trace_mtu3_gadget_ep_enable(mep);

	return ret;
}

static int mtu3_gadget_ep_disable(struct usb_ep *ep)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3 *mtu = mep->mtu;
	unsigned long flags;

	dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
	trace_mtu3_gadget_ep_disable(mep);

	if (!(mep->flags & MTU3_EP_ENABLED)) {
		dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
		return 0;
	}

	spin_lock_irqsave(&mtu->lock, flags);
	mtu3_ep_disable(mep);
	mep->flags = 0;
	mtu->active_ep--;
	spin_unlock_irqrestore(&(mtu->lock), flags);

	dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
		__func__, mtu->active_ep, mtu->is_active);

	return 0;
}

struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3_request *mreq;

	mreq = kzalloc(sizeof(*mreq), gfp_flags);
	if (!mreq)
		return NULL;

	mreq->request.dma = DMA_ADDR_INVALID;
	mreq->epnum = mep->epnum;
	mreq->mep = mep;
	INIT_LIST_HEAD(&mreq->list);
	trace_mtu3_alloc_request(mreq);

	return &mreq->request;
}

void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
{
	struct mtu3_request *mreq = to_mtu3_request(req);

	trace_mtu3_free_request(mreq);
	kfree(mreq);
}

static int mtu3_gadget_queue(struct usb_ep *ep,
		struct usb_request *req, gfp_t gfp_flags)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3_request *mreq = to_mtu3_request(req);
	struct mtu3 *mtu = mep->mtu;
	unsigned long flags;
	int ret = 0;

	if (!req->buf)
		return -ENODATA;

	if (mreq->mep != mep)
		return -EINVAL;

	dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
		__func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
		mreq, ep->maxpacket, mreq->request.length);

	if (req->length > GPD_BUF_SIZE ||
	    (mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) {
		dev_warn(mtu->dev,
			"req length > supported MAX:%d requested:%d\n",
			mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE,
			req->length);
		return -EOPNOTSUPP;
	}

	/* don't queue if the ep is down */
	if (!mep->desc) {
		dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
			req, ep->name);
		return -ESHUTDOWN;
	}

	mreq->mtu = mtu;
	mreq->request.actual = 0;
	mreq->request.status = -EINPROGRESS;

	ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
	if (ret) {
		dev_err(mtu->dev, "dma mapping failed\n");
		return ret;
	}

	spin_lock_irqsave(&mtu->lock, flags);

	if (mtu3_prepare_transfer(mep)) {
		ret = -EAGAIN;
		goto error;
	}

	list_add_tail(&mreq->list, &mep->req_list);
	mtu3_insert_gpd(mep, mreq);
	mtu3_qmu_resume(mep);

error:
	spin_unlock_irqrestore(&mtu->lock, flags);
	trace_mtu3_gadget_queue(mreq);

	return ret;
}

static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3_request *mreq = to_mtu3_request(req);
	struct mtu3_request *r;
	struct mtu3 *mtu = mep->mtu;
	unsigned long flags;
	int ret = 0;

	if (mreq->mep != mep)
		return -EINVAL;

	dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
	trace_mtu3_gadget_dequeue(mreq);

	spin_lock_irqsave(&mtu->lock, flags);

	list_for_each_entry(r, &mep->req_list, list) {
		if (r == mreq)
			break;
	}
	if (r != mreq) {
		dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
		ret = -EINVAL;
		goto done;
	}

	mtu3_qmu_flush(mep);  /* REVISIT: set BPS ?? */
	mtu3_req_complete(mep, req, -ECONNRESET);
	mtu3_qmu_start(mep);

done:
	spin_unlock_irqrestore(&mtu->lock, flags);

	return ret;
}

/*
 * Set or clear the halt bit of an EP.
 * A halted EP won't TX/RX any data but will queue requests.
 */
static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3 *mtu = mep->mtu;
	struct mtu3_request *mreq;
	unsigned long flags;
	int ret = 0;

	dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);

	spin_lock_irqsave(&mtu->lock, flags);

	if (mep->type == USB_ENDPOINT_XFER_ISOC) {
		ret = -EINVAL;
		goto done;
	}

	mreq = next_request(mep);
	if (value) {
		/*
		 * If there is not request for TX-EP, QMU will not transfer
		 * data to TX-FIFO, so no need check whether TX-FIFO
		 * holds bytes or not here
		 */
		if (mreq) {
			dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
				ep->name);
			ret = -EAGAIN;
			goto done;
		}
	} else {
		mep->flags &= ~MTU3_EP_WEDGE;
	}

	dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");

	mtu3_ep_stall_set(mep, value);

done:
	spin_unlock_irqrestore(&mtu->lock, flags);
	trace_mtu3_gadget_ep_set_halt(mep);

	return ret;
}

/* Sets the halt feature with the clear requests ignored */
static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);

	mep->flags |= MTU3_EP_WEDGE;

	return usb_ep_set_halt(ep);
}

static const struct usb_ep_ops mtu3_ep_ops = {
	.enable = mtu3_gadget_ep_enable,
	.disable = mtu3_gadget_ep_disable,
	.alloc_request = mtu3_alloc_request,
	.free_request = mtu3_free_request,
	.queue = mtu3_gadget_queue,
	.dequeue = mtu3_gadget_dequeue,
	.set_halt = mtu3_gadget_ep_set_halt,
	.set_wedge = mtu3_gadget_ep_set_wedge,
};

static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);

	return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
}

static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s\n", __func__);

	/* remote wakeup feature is not enabled by host */
	if (!mtu->may_wakeup)
		return  -EOPNOTSUPP;

	spin_lock_irqsave(&mtu->lock, flags);
	if (mtu->g.speed >= USB_SPEED_SUPER) {
		mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
	} else {
		mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
		spin_unlock_irqrestore(&mtu->lock, flags);
		usleep_range(10000, 11000);
		spin_lock_irqsave(&mtu->lock, flags);
		mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
	}
	spin_unlock_irqrestore(&mtu->lock, flags);
	return 0;
}

static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
		int is_selfpowered)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);

	mtu->is_self_powered = !!is_selfpowered;
	return 0;
}

static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
		is_on ? "on" : "off", mtu->is_active ? "" : "in");

	pm_runtime_get_sync(mtu->dev);

	/* we'd rather not pullup unless the device is active. */
	spin_lock_irqsave(&mtu->lock, flags);

	is_on = !!is_on;
	if (!mtu->is_active) {
		/* save it for mtu3_start() to process the request */
		mtu->softconnect = is_on;
	} else if (is_on != mtu->softconnect) {
		mtu->softconnect = is_on;
		mtu3_dev_on_off(mtu, is_on);
	}

	spin_unlock_irqrestore(&mtu->lock, flags);
	pm_runtime_put(mtu->dev);

	return 0;
}

static int mtu3_gadget_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	unsigned long flags;

	if (mtu->gadget_driver) {
		dev_err(mtu->dev, "%s is already bound to %s\n",
			mtu->g.name, mtu->gadget_driver->driver.name);
		return -EBUSY;
	}

	dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
	pm_runtime_get_sync(mtu->dev);

	spin_lock_irqsave(&mtu->lock, flags);

	mtu->softconnect = 0;
	mtu->gadget_driver = driver;

	if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
		mtu3_start(mtu);

	spin_unlock_irqrestore(&mtu->lock, flags);
	pm_runtime_put(mtu->dev);

	return 0;
}

static void stop_activity(struct mtu3 *mtu)
{
	struct usb_gadget_driver *driver = mtu->gadget_driver;
	int i;

	/* don't disconnect if it's not connected */
	if (mtu->g.speed == USB_SPEED_UNKNOWN)
		driver = NULL;
	else
		mtu->g.speed = USB_SPEED_UNKNOWN;

	/* deactivate the hardware */
	if (mtu->softconnect) {
		mtu->softconnect = 0;
		mtu3_dev_on_off(mtu, 0);
	}

	/*
	 * killing any outstanding requests will quiesce the driver;
	 * then report disconnect
	 */
	nuke(mtu->ep0, -ESHUTDOWN);
	for (i = 1; i < mtu->num_eps; i++) {
		nuke(mtu->in_eps + i, -ESHUTDOWN);
		nuke(mtu->out_eps + i, -ESHUTDOWN);
	}

	if (driver) {
		spin_unlock(&mtu->lock);
		driver->disconnect(&mtu->g);
		spin_lock(&mtu->lock);
	}
}

static int mtu3_gadget_stop(struct usb_gadget *g)
{
	struct mtu3 *mtu = gadget_to_mtu3(g);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s\n", __func__);

	spin_lock_irqsave(&mtu->lock, flags);

	stop_activity(mtu);
	mtu->gadget_driver = NULL;

	if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
		mtu3_stop(mtu);

	spin_unlock_irqrestore(&mtu->lock, flags);

	synchronize_irq(mtu->irq);
	return 0;
}

static void
mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
{
	struct mtu3 *mtu = gadget_to_mtu3(g);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s %s\n", __func__, usb_speed_string(speed));

	spin_lock_irqsave(&mtu->lock, flags);
	mtu->speed = speed;
	spin_unlock_irqrestore(&mtu->lock, flags);
}

static const struct usb_gadget_ops mtu3_gadget_ops = {
	.get_frame = mtu3_gadget_get_frame,
	.wakeup = mtu3_gadget_wakeup,
	.set_selfpowered = mtu3_gadget_set_self_powered,
	.pullup = mtu3_gadget_pullup,
	.udc_start = mtu3_gadget_start,
	.udc_stop = mtu3_gadget_stop,
	.udc_set_speed = mtu3_gadget_set_speed,
};

static void mtu3_state_reset(struct mtu3 *mtu)
{
	mtu->address = 0;
	mtu->ep0_state = MU3D_EP0_STATE_SETUP;
	mtu->may_wakeup = 0;
	mtu->u1_enable = 0;
	mtu->u2_enable = 0;
	mtu->delayed_status = false;
	mtu->test_mode = false;
}

static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
		u32 epnum, u32 is_in)
{
	mep->epnum = epnum;
	mep->mtu = mtu;
	mep->is_in = is_in;

	INIT_LIST_HEAD(&mep->req_list);

	sprintf(mep->name, "ep%d%s", epnum,
		!epnum ? "" : (is_in ? "in" : "out"));

	mep->ep.name = mep->name;
	INIT_LIST_HEAD(&mep->ep.ep_list);

	/* initialize maxpacket as SS */
	if (!epnum) {
		usb_ep_set_maxpacket_limit(&mep->ep, 512);
		mep->ep.caps.type_control = true;
		mep->ep.ops = &mtu3_ep0_ops;
		mtu->g.ep0 = &mep->ep;
	} else {
		usb_ep_set_maxpacket_limit(&mep->ep, 1024);
		mep->ep.caps.type_iso = true;
		mep->ep.caps.type_bulk = true;
		mep->ep.caps.type_int = true;
		mep->ep.ops = &mtu3_ep_ops;
		list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
	}

	dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
		 mep->ep.maxpacket);

	if (!epnum) {
		mep->ep.caps.dir_in = true;
		mep->ep.caps.dir_out = true;
	} else if (is_in) {
		mep->ep.caps.dir_in = true;
	} else {
		mep->ep.caps.dir_out = true;
	}
}

static void mtu3_gadget_init_eps(struct mtu3 *mtu)
{
	u8 epnum;

	/* initialize endpoint list just once */
	INIT_LIST_HEAD(&(mtu->g.ep_list));

	dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
		__func__, mtu->num_eps);

	init_hw_ep(mtu, mtu->ep0, 0, 0);
	for (epnum = 1; epnum < mtu->num_eps; epnum++) {
		init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
		init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
	}
}

int mtu3_gadget_setup(struct mtu3 *mtu)
{
	mtu->g.ops = &mtu3_gadget_ops;
	mtu->g.max_speed = mtu->max_speed;
	mtu->g.speed = USB_SPEED_UNKNOWN;
	mtu->g.sg_supported = 0;
	mtu->g.name = MTU3_DRIVER_NAME;
	mtu->is_active = 0;
	mtu->delayed_status = false;

	mtu3_gadget_init_eps(mtu);

	return usb_add_gadget_udc(mtu->dev, &mtu->g);
}

void mtu3_gadget_cleanup(struct mtu3 *mtu)
{
	usb_del_gadget_udc(&mtu->g);
}

void mtu3_gadget_resume(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget RESUME\n");
	if (mtu->gadget_driver && mtu->gadget_driver->resume) {
		spin_unlock(&mtu->lock);
		mtu->gadget_driver->resume(&mtu->g);
		spin_lock(&mtu->lock);
	}
}

/* called when SOF packets stop for 3+ msec or enters U3 */
void mtu3_gadget_suspend(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget SUSPEND\n");
	if (mtu->gadget_driver && mtu->gadget_driver->suspend) {
		spin_unlock(&mtu->lock);
		mtu->gadget_driver->suspend(&mtu->g);
		spin_lock(&mtu->lock);
	}
}

/* called when VBUS drops below session threshold, and in other cases */
void mtu3_gadget_disconnect(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget DISCONNECT\n");
	if (mtu->gadget_driver && mtu->gadget_driver->disconnect) {
		spin_unlock(&mtu->lock);
		mtu->gadget_driver->disconnect(&mtu->g);
		spin_lock(&mtu->lock);
	}

	mtu3_state_reset(mtu);
	usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
}

void mtu3_gadget_reset(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget RESET\n");

	/* report disconnect, if we didn't flush EP state */
	if (mtu->g.speed != USB_SPEED_UNKNOWN)
		mtu3_gadget_disconnect(mtu);
	else
		mtu3_state_reset(mtu);
}