xref: /openbmc/linux/drivers/usb/gadget/udc/dummy_hcd.c (revision 023e4163)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
4  *
5  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
6  *
7  * Copyright (C) 2003 David Brownell
8  * Copyright (C) 2003-2005 Alan Stern
9  */
10 
11 
12 /*
13  * This exposes a device side "USB gadget" API, driven by requests to a
14  * Linux-USB host controller driver.  USB traffic is simulated; there's
15  * no need for USB hardware.  Use this with two other drivers:
16  *
17  *  - Gadget driver, responding to requests (slave);
18  *  - Host-side device driver, as already familiar in Linux.
19  *
20  * Having this all in one kernel can help some stages of development,
21  * bypassing some hardware (and driver) issues.  UML could help too.
22  *
23  * Note: The emulation does not include isochronous transfers!
24  */
25 
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/init.h>
33 #include <linux/timer.h>
34 #include <linux/list.h>
35 #include <linux/interrupt.h>
36 #include <linux/platform_device.h>
37 #include <linux/usb.h>
38 #include <linux/usb/gadget.h>
39 #include <linux/usb/hcd.h>
40 #include <linux/scatterlist.h>
41 
42 #include <asm/byteorder.h>
43 #include <linux/io.h>
44 #include <asm/irq.h>
45 #include <asm/unaligned.h>
46 
47 #define DRIVER_DESC	"USB Host+Gadget Emulator"
48 #define DRIVER_VERSION	"02 May 2005"
49 
50 #define POWER_BUDGET	500	/* in mA; use 8 for low-power port testing */
51 
52 static const char	driver_name[] = "dummy_hcd";
53 static const char	driver_desc[] = "USB Host+Gadget Emulator";
54 
55 static const char	gadget_name[] = "dummy_udc";
56 
57 MODULE_DESCRIPTION(DRIVER_DESC);
58 MODULE_AUTHOR("David Brownell");
59 MODULE_LICENSE("GPL");
60 
61 struct dummy_hcd_module_parameters {
62 	bool is_super_speed;
63 	bool is_high_speed;
64 	unsigned int num;
65 };
66 
67 static struct dummy_hcd_module_parameters mod_data = {
68 	.is_super_speed = false,
69 	.is_high_speed = true,
70 	.num = 1,
71 };
72 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
73 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
74 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
75 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
76 module_param_named(num, mod_data.num, uint, S_IRUGO);
77 MODULE_PARM_DESC(num, "number of emulated controllers");
78 /*-------------------------------------------------------------------------*/
79 
80 /* gadget side driver data structres */
81 struct dummy_ep {
82 	struct list_head		queue;
83 	unsigned long			last_io;	/* jiffies timestamp */
84 	struct usb_gadget		*gadget;
85 	const struct usb_endpoint_descriptor *desc;
86 	struct usb_ep			ep;
87 	unsigned			halted:1;
88 	unsigned			wedged:1;
89 	unsigned			already_seen:1;
90 	unsigned			setup_stage:1;
91 	unsigned			stream_en:1;
92 };
93 
94 struct dummy_request {
95 	struct list_head		queue;		/* ep's requests */
96 	struct usb_request		req;
97 };
98 
99 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
100 {
101 	return container_of(_ep, struct dummy_ep, ep);
102 }
103 
104 static inline struct dummy_request *usb_request_to_dummy_request
105 		(struct usb_request *_req)
106 {
107 	return container_of(_req, struct dummy_request, req);
108 }
109 
110 /*-------------------------------------------------------------------------*/
111 
112 /*
113  * Every device has ep0 for control requests, plus up to 30 more endpoints,
114  * in one of two types:
115  *
116  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
117  *     number can be changed.  Names like "ep-a" are used for this type.
118  *
119  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
120  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
121  *
122  * Gadget drivers are responsible for not setting up conflicting endpoint
123  * configurations, illegal or unsupported packet lengths, and so on.
124  */
125 
126 static const char ep0name[] = "ep0";
127 
128 static const struct {
129 	const char *name;
130 	const struct usb_ep_caps caps;
131 } ep_info[] = {
132 #define EP_INFO(_name, _caps) \
133 	{ \
134 		.name = _name, \
135 		.caps = _caps, \
136 	}
137 
138 /* we don't provide isochronous endpoints since we don't support them */
139 #define TYPE_BULK_OR_INT	(USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT)
140 
141 	/* everyone has ep0 */
142 	EP_INFO(ep0name,
143 		USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
144 	/* act like a pxa250: fifteen fixed function endpoints */
145 	EP_INFO("ep1in-bulk",
146 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
147 	EP_INFO("ep2out-bulk",
148 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
149 /*
150 	EP_INFO("ep3in-iso",
151 		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
152 	EP_INFO("ep4out-iso",
153 		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
154 */
155 	EP_INFO("ep5in-int",
156 		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
157 	EP_INFO("ep6in-bulk",
158 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
159 	EP_INFO("ep7out-bulk",
160 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
161 /*
162 	EP_INFO("ep8in-iso",
163 		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
164 	EP_INFO("ep9out-iso",
165 		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
166 */
167 	EP_INFO("ep10in-int",
168 		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
169 	EP_INFO("ep11in-bulk",
170 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
171 	EP_INFO("ep12out-bulk",
172 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
173 /*
174 	EP_INFO("ep13in-iso",
175 		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
176 	EP_INFO("ep14out-iso",
177 		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
178 */
179 	EP_INFO("ep15in-int",
180 		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
181 
182 	/* or like sa1100: two fixed function endpoints */
183 	EP_INFO("ep1out-bulk",
184 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
185 	EP_INFO("ep2in-bulk",
186 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
187 
188 	/* and now some generic EPs so we have enough in multi config */
189 	EP_INFO("ep3out",
190 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
191 	EP_INFO("ep4in",
192 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
193 	EP_INFO("ep5out",
194 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
195 	EP_INFO("ep6out",
196 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
197 	EP_INFO("ep7in",
198 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
199 	EP_INFO("ep8out",
200 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
201 	EP_INFO("ep9in",
202 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
203 	EP_INFO("ep10out",
204 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
205 	EP_INFO("ep11out",
206 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
207 	EP_INFO("ep12in",
208 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
209 	EP_INFO("ep13out",
210 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
211 	EP_INFO("ep14in",
212 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
213 	EP_INFO("ep15out",
214 		USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
215 
216 #undef EP_INFO
217 };
218 
219 #define DUMMY_ENDPOINTS	ARRAY_SIZE(ep_info)
220 
221 /*-------------------------------------------------------------------------*/
222 
223 #define FIFO_SIZE		64
224 
225 struct urbp {
226 	struct urb		*urb;
227 	struct list_head	urbp_list;
228 	struct sg_mapping_iter	miter;
229 	u32			miter_started;
230 };
231 
232 
233 enum dummy_rh_state {
234 	DUMMY_RH_RESET,
235 	DUMMY_RH_SUSPENDED,
236 	DUMMY_RH_RUNNING
237 };
238 
239 struct dummy_hcd {
240 	struct dummy			*dum;
241 	enum dummy_rh_state		rh_state;
242 	struct timer_list		timer;
243 	u32				port_status;
244 	u32				old_status;
245 	unsigned long			re_timeout;
246 
247 	struct usb_device		*udev;
248 	struct list_head		urbp_list;
249 	struct urbp			*next_frame_urbp;
250 
251 	u32				stream_en_ep;
252 	u8				num_stream[30 / 2];
253 
254 	unsigned			active:1;
255 	unsigned			old_active:1;
256 	unsigned			resuming:1;
257 };
258 
259 struct dummy {
260 	spinlock_t			lock;
261 
262 	/*
263 	 * SLAVE/GADGET side support
264 	 */
265 	struct dummy_ep			ep[DUMMY_ENDPOINTS];
266 	int				address;
267 	int				callback_usage;
268 	struct usb_gadget		gadget;
269 	struct usb_gadget_driver	*driver;
270 	struct dummy_request		fifo_req;
271 	u8				fifo_buf[FIFO_SIZE];
272 	u16				devstatus;
273 	unsigned			ints_enabled:1;
274 	unsigned			udc_suspended:1;
275 	unsigned			pullup:1;
276 
277 	/*
278 	 * MASTER/HOST side support
279 	 */
280 	struct dummy_hcd		*hs_hcd;
281 	struct dummy_hcd		*ss_hcd;
282 };
283 
284 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
285 {
286 	return (struct dummy_hcd *) (hcd->hcd_priv);
287 }
288 
289 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
290 {
291 	return container_of((void *) dum, struct usb_hcd, hcd_priv);
292 }
293 
294 static inline struct device *dummy_dev(struct dummy_hcd *dum)
295 {
296 	return dummy_hcd_to_hcd(dum)->self.controller;
297 }
298 
299 static inline struct device *udc_dev(struct dummy *dum)
300 {
301 	return dum->gadget.dev.parent;
302 }
303 
304 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
305 {
306 	return container_of(ep->gadget, struct dummy, gadget);
307 }
308 
309 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
310 {
311 	struct dummy *dum = container_of(gadget, struct dummy, gadget);
312 	if (dum->gadget.speed == USB_SPEED_SUPER)
313 		return dum->ss_hcd;
314 	else
315 		return dum->hs_hcd;
316 }
317 
318 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
319 {
320 	return container_of(dev, struct dummy, gadget.dev);
321 }
322 
323 /*-------------------------------------------------------------------------*/
324 
325 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
326 
327 /* called with spinlock held */
328 static void nuke(struct dummy *dum, struct dummy_ep *ep)
329 {
330 	while (!list_empty(&ep->queue)) {
331 		struct dummy_request	*req;
332 
333 		req = list_entry(ep->queue.next, struct dummy_request, queue);
334 		list_del_init(&req->queue);
335 		req->req.status = -ESHUTDOWN;
336 
337 		spin_unlock(&dum->lock);
338 		usb_gadget_giveback_request(&ep->ep, &req->req);
339 		spin_lock(&dum->lock);
340 	}
341 }
342 
343 /* caller must hold lock */
344 static void stop_activity(struct dummy *dum)
345 {
346 	int i;
347 
348 	/* prevent any more requests */
349 	dum->address = 0;
350 
351 	/* The timer is left running so that outstanding URBs can fail */
352 
353 	/* nuke any pending requests first, so driver i/o is quiesced */
354 	for (i = 0; i < DUMMY_ENDPOINTS; ++i)
355 		nuke(dum, &dum->ep[i]);
356 
357 	/* driver now does any non-usb quiescing necessary */
358 }
359 
360 /**
361  * set_link_state_by_speed() - Sets the current state of the link according to
362  *	the hcd speed
363  * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
364  *
365  * This function updates the port_status according to the link state and the
366  * speed of the hcd.
367  */
368 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
369 {
370 	struct dummy *dum = dum_hcd->dum;
371 
372 	if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
373 		if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
374 			dum_hcd->port_status = 0;
375 		} else if (!dum->pullup || dum->udc_suspended) {
376 			/* UDC suspend must cause a disconnect */
377 			dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
378 						USB_PORT_STAT_ENABLE);
379 			if ((dum_hcd->old_status &
380 			     USB_PORT_STAT_CONNECTION) != 0)
381 				dum_hcd->port_status |=
382 					(USB_PORT_STAT_C_CONNECTION << 16);
383 		} else {
384 			/* device is connected and not suspended */
385 			dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
386 						 USB_PORT_STAT_SPEED_5GBPS) ;
387 			if ((dum_hcd->old_status &
388 			     USB_PORT_STAT_CONNECTION) == 0)
389 				dum_hcd->port_status |=
390 					(USB_PORT_STAT_C_CONNECTION << 16);
391 			if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) &&
392 			    (dum_hcd->port_status &
393 			     USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 &&
394 			    dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
395 				dum_hcd->active = 1;
396 		}
397 	} else {
398 		if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
399 			dum_hcd->port_status = 0;
400 		} else if (!dum->pullup || dum->udc_suspended) {
401 			/* UDC suspend must cause a disconnect */
402 			dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
403 						USB_PORT_STAT_ENABLE |
404 						USB_PORT_STAT_LOW_SPEED |
405 						USB_PORT_STAT_HIGH_SPEED |
406 						USB_PORT_STAT_SUSPEND);
407 			if ((dum_hcd->old_status &
408 			     USB_PORT_STAT_CONNECTION) != 0)
409 				dum_hcd->port_status |=
410 					(USB_PORT_STAT_C_CONNECTION << 16);
411 		} else {
412 			dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
413 			if ((dum_hcd->old_status &
414 			     USB_PORT_STAT_CONNECTION) == 0)
415 				dum_hcd->port_status |=
416 					(USB_PORT_STAT_C_CONNECTION << 16);
417 			if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
418 				dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
419 			else if ((dum_hcd->port_status &
420 				  USB_PORT_STAT_SUSPEND) == 0 &&
421 					dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
422 				dum_hcd->active = 1;
423 		}
424 	}
425 }
426 
427 /* caller must hold lock */
428 static void set_link_state(struct dummy_hcd *dum_hcd)
429 {
430 	struct dummy *dum = dum_hcd->dum;
431 	unsigned int power_bit;
432 
433 	dum_hcd->active = 0;
434 	if (dum->pullup)
435 		if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
436 		     dum->gadget.speed != USB_SPEED_SUPER) ||
437 		    (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
438 		     dum->gadget.speed == USB_SPEED_SUPER))
439 			return;
440 
441 	set_link_state_by_speed(dum_hcd);
442 	power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ?
443 			USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER);
444 
445 	if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
446 	     dum_hcd->active)
447 		dum_hcd->resuming = 0;
448 
449 	/* Currently !connected or in reset */
450 	if ((dum_hcd->port_status & power_bit) == 0 ||
451 			(dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
452 		unsigned int disconnect = power_bit &
453 				dum_hcd->old_status & (~dum_hcd->port_status);
454 		unsigned int reset = USB_PORT_STAT_RESET &
455 				(~dum_hcd->old_status) & dum_hcd->port_status;
456 
457 		/* Report reset and disconnect events to the driver */
458 		if (dum->ints_enabled && (disconnect || reset)) {
459 			stop_activity(dum);
460 			++dum->callback_usage;
461 			spin_unlock(&dum->lock);
462 			if (reset)
463 				usb_gadget_udc_reset(&dum->gadget, dum->driver);
464 			else
465 				dum->driver->disconnect(&dum->gadget);
466 			spin_lock(&dum->lock);
467 			--dum->callback_usage;
468 		}
469 	} else if (dum_hcd->active != dum_hcd->old_active &&
470 			dum->ints_enabled) {
471 		++dum->callback_usage;
472 		spin_unlock(&dum->lock);
473 		if (dum_hcd->old_active && dum->driver->suspend)
474 			dum->driver->suspend(&dum->gadget);
475 		else if (!dum_hcd->old_active &&  dum->driver->resume)
476 			dum->driver->resume(&dum->gadget);
477 		spin_lock(&dum->lock);
478 		--dum->callback_usage;
479 	}
480 
481 	dum_hcd->old_status = dum_hcd->port_status;
482 	dum_hcd->old_active = dum_hcd->active;
483 }
484 
485 /*-------------------------------------------------------------------------*/
486 
487 /* SLAVE/GADGET SIDE DRIVER
488  *
489  * This only tracks gadget state.  All the work is done when the host
490  * side tries some (emulated) i/o operation.  Real device controller
491  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
492  */
493 
494 #define is_enabled(dum) \
495 	(dum->port_status & USB_PORT_STAT_ENABLE)
496 
497 static int dummy_enable(struct usb_ep *_ep,
498 		const struct usb_endpoint_descriptor *desc)
499 {
500 	struct dummy		*dum;
501 	struct dummy_hcd	*dum_hcd;
502 	struct dummy_ep		*ep;
503 	unsigned		max;
504 	int			retval;
505 
506 	ep = usb_ep_to_dummy_ep(_ep);
507 	if (!_ep || !desc || ep->desc || _ep->name == ep0name
508 			|| desc->bDescriptorType != USB_DT_ENDPOINT)
509 		return -EINVAL;
510 	dum = ep_to_dummy(ep);
511 	if (!dum->driver)
512 		return -ESHUTDOWN;
513 
514 	dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
515 	if (!is_enabled(dum_hcd))
516 		return -ESHUTDOWN;
517 
518 	/*
519 	 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
520 	 * maximum packet size.
521 	 * For SS devices the wMaxPacketSize is limited by 1024.
522 	 */
523 	max = usb_endpoint_maxp(desc);
524 
525 	/* drivers must not request bad settings, since lower levels
526 	 * (hardware or its drivers) may not check.  some endpoints
527 	 * can't do iso, many have maxpacket limitations, etc.
528 	 *
529 	 * since this "hardware" driver is here to help debugging, we
530 	 * have some extra sanity checks.  (there could be more though,
531 	 * especially for "ep9out" style fixed function ones.)
532 	 */
533 	retval = -EINVAL;
534 	switch (usb_endpoint_type(desc)) {
535 	case USB_ENDPOINT_XFER_BULK:
536 		if (strstr(ep->ep.name, "-iso")
537 				|| strstr(ep->ep.name, "-int")) {
538 			goto done;
539 		}
540 		switch (dum->gadget.speed) {
541 		case USB_SPEED_SUPER:
542 			if (max == 1024)
543 				break;
544 			goto done;
545 		case USB_SPEED_HIGH:
546 			if (max == 512)
547 				break;
548 			goto done;
549 		case USB_SPEED_FULL:
550 			if (max == 8 || max == 16 || max == 32 || max == 64)
551 				/* we'll fake any legal size */
552 				break;
553 			/* save a return statement */
554 		default:
555 			goto done;
556 		}
557 		break;
558 	case USB_ENDPOINT_XFER_INT:
559 		if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
560 			goto done;
561 		/* real hardware might not handle all packet sizes */
562 		switch (dum->gadget.speed) {
563 		case USB_SPEED_SUPER:
564 		case USB_SPEED_HIGH:
565 			if (max <= 1024)
566 				break;
567 			/* save a return statement */
568 			/* fall through */
569 		case USB_SPEED_FULL:
570 			if (max <= 64)
571 				break;
572 			/* save a return statement */
573 			/* fall through */
574 		default:
575 			if (max <= 8)
576 				break;
577 			goto done;
578 		}
579 		break;
580 	case USB_ENDPOINT_XFER_ISOC:
581 		if (strstr(ep->ep.name, "-bulk")
582 				|| strstr(ep->ep.name, "-int"))
583 			goto done;
584 		/* real hardware might not handle all packet sizes */
585 		switch (dum->gadget.speed) {
586 		case USB_SPEED_SUPER:
587 		case USB_SPEED_HIGH:
588 			if (max <= 1024)
589 				break;
590 			/* save a return statement */
591 			/* fall through */
592 		case USB_SPEED_FULL:
593 			if (max <= 1023)
594 				break;
595 			/* save a return statement */
596 		default:
597 			goto done;
598 		}
599 		break;
600 	default:
601 		/* few chips support control except on ep0 */
602 		goto done;
603 	}
604 
605 	_ep->maxpacket = max;
606 	if (usb_ss_max_streams(_ep->comp_desc)) {
607 		if (!usb_endpoint_xfer_bulk(desc)) {
608 			dev_err(udc_dev(dum), "Can't enable stream support on "
609 					"non-bulk ep %s\n", _ep->name);
610 			return -EINVAL;
611 		}
612 		ep->stream_en = 1;
613 	}
614 	ep->desc = desc;
615 
616 	dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
617 		_ep->name,
618 		desc->bEndpointAddress & 0x0f,
619 		(desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
620 		({ char *val;
621 		 switch (usb_endpoint_type(desc)) {
622 		 case USB_ENDPOINT_XFER_BULK:
623 			 val = "bulk";
624 			 break;
625 		 case USB_ENDPOINT_XFER_ISOC:
626 			 val = "iso";
627 			 break;
628 		 case USB_ENDPOINT_XFER_INT:
629 			 val = "intr";
630 			 break;
631 		 default:
632 			 val = "ctrl";
633 			 break;
634 		 } val; }),
635 		max, ep->stream_en ? "enabled" : "disabled");
636 
637 	/* at this point real hardware should be NAKing transfers
638 	 * to that endpoint, until a buffer is queued to it.
639 	 */
640 	ep->halted = ep->wedged = 0;
641 	retval = 0;
642 done:
643 	return retval;
644 }
645 
646 static int dummy_disable(struct usb_ep *_ep)
647 {
648 	struct dummy_ep		*ep;
649 	struct dummy		*dum;
650 	unsigned long		flags;
651 
652 	ep = usb_ep_to_dummy_ep(_ep);
653 	if (!_ep || !ep->desc || _ep->name == ep0name)
654 		return -EINVAL;
655 	dum = ep_to_dummy(ep);
656 
657 	spin_lock_irqsave(&dum->lock, flags);
658 	ep->desc = NULL;
659 	ep->stream_en = 0;
660 	nuke(dum, ep);
661 	spin_unlock_irqrestore(&dum->lock, flags);
662 
663 	dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
664 	return 0;
665 }
666 
667 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
668 		gfp_t mem_flags)
669 {
670 	struct dummy_request	*req;
671 
672 	if (!_ep)
673 		return NULL;
674 
675 	req = kzalloc(sizeof(*req), mem_flags);
676 	if (!req)
677 		return NULL;
678 	INIT_LIST_HEAD(&req->queue);
679 	return &req->req;
680 }
681 
682 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
683 {
684 	struct dummy_request	*req;
685 
686 	if (!_ep || !_req) {
687 		WARN_ON(1);
688 		return;
689 	}
690 
691 	req = usb_request_to_dummy_request(_req);
692 	WARN_ON(!list_empty(&req->queue));
693 	kfree(req);
694 }
695 
696 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
697 {
698 }
699 
700 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
701 		gfp_t mem_flags)
702 {
703 	struct dummy_ep		*ep;
704 	struct dummy_request	*req;
705 	struct dummy		*dum;
706 	struct dummy_hcd	*dum_hcd;
707 	unsigned long		flags;
708 
709 	req = usb_request_to_dummy_request(_req);
710 	if (!_req || !list_empty(&req->queue) || !_req->complete)
711 		return -EINVAL;
712 
713 	ep = usb_ep_to_dummy_ep(_ep);
714 	if (!_ep || (!ep->desc && _ep->name != ep0name))
715 		return -EINVAL;
716 
717 	dum = ep_to_dummy(ep);
718 	dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
719 	if (!dum->driver || !is_enabled(dum_hcd))
720 		return -ESHUTDOWN;
721 
722 #if 0
723 	dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
724 			ep, _req, _ep->name, _req->length, _req->buf);
725 #endif
726 	_req->status = -EINPROGRESS;
727 	_req->actual = 0;
728 	spin_lock_irqsave(&dum->lock, flags);
729 
730 	/* implement an emulated single-request FIFO */
731 	if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
732 			list_empty(&dum->fifo_req.queue) &&
733 			list_empty(&ep->queue) &&
734 			_req->length <= FIFO_SIZE) {
735 		req = &dum->fifo_req;
736 		req->req = *_req;
737 		req->req.buf = dum->fifo_buf;
738 		memcpy(dum->fifo_buf, _req->buf, _req->length);
739 		req->req.context = dum;
740 		req->req.complete = fifo_complete;
741 
742 		list_add_tail(&req->queue, &ep->queue);
743 		spin_unlock(&dum->lock);
744 		_req->actual = _req->length;
745 		_req->status = 0;
746 		usb_gadget_giveback_request(_ep, _req);
747 		spin_lock(&dum->lock);
748 	}  else
749 		list_add_tail(&req->queue, &ep->queue);
750 	spin_unlock_irqrestore(&dum->lock, flags);
751 
752 	/* real hardware would likely enable transfers here, in case
753 	 * it'd been left NAKing.
754 	 */
755 	return 0;
756 }
757 
758 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
759 {
760 	struct dummy_ep		*ep;
761 	struct dummy		*dum;
762 	int			retval = -EINVAL;
763 	unsigned long		flags;
764 	struct dummy_request	*req = NULL;
765 
766 	if (!_ep || !_req)
767 		return retval;
768 	ep = usb_ep_to_dummy_ep(_ep);
769 	dum = ep_to_dummy(ep);
770 
771 	if (!dum->driver)
772 		return -ESHUTDOWN;
773 
774 	local_irq_save(flags);
775 	spin_lock(&dum->lock);
776 	list_for_each_entry(req, &ep->queue, queue) {
777 		if (&req->req == _req) {
778 			list_del_init(&req->queue);
779 			_req->status = -ECONNRESET;
780 			retval = 0;
781 			break;
782 		}
783 	}
784 	spin_unlock(&dum->lock);
785 
786 	if (retval == 0) {
787 		dev_dbg(udc_dev(dum),
788 				"dequeued req %p from %s, len %d buf %p\n",
789 				req, _ep->name, _req->length, _req->buf);
790 		usb_gadget_giveback_request(_ep, _req);
791 	}
792 	local_irq_restore(flags);
793 	return retval;
794 }
795 
796 static int
797 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
798 {
799 	struct dummy_ep		*ep;
800 	struct dummy		*dum;
801 
802 	if (!_ep)
803 		return -EINVAL;
804 	ep = usb_ep_to_dummy_ep(_ep);
805 	dum = ep_to_dummy(ep);
806 	if (!dum->driver)
807 		return -ESHUTDOWN;
808 	if (!value)
809 		ep->halted = ep->wedged = 0;
810 	else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
811 			!list_empty(&ep->queue))
812 		return -EAGAIN;
813 	else {
814 		ep->halted = 1;
815 		if (wedged)
816 			ep->wedged = 1;
817 	}
818 	/* FIXME clear emulated data toggle too */
819 	return 0;
820 }
821 
822 static int
823 dummy_set_halt(struct usb_ep *_ep, int value)
824 {
825 	return dummy_set_halt_and_wedge(_ep, value, 0);
826 }
827 
828 static int dummy_set_wedge(struct usb_ep *_ep)
829 {
830 	if (!_ep || _ep->name == ep0name)
831 		return -EINVAL;
832 	return dummy_set_halt_and_wedge(_ep, 1, 1);
833 }
834 
835 static const struct usb_ep_ops dummy_ep_ops = {
836 	.enable		= dummy_enable,
837 	.disable	= dummy_disable,
838 
839 	.alloc_request	= dummy_alloc_request,
840 	.free_request	= dummy_free_request,
841 
842 	.queue		= dummy_queue,
843 	.dequeue	= dummy_dequeue,
844 
845 	.set_halt	= dummy_set_halt,
846 	.set_wedge	= dummy_set_wedge,
847 };
848 
849 /*-------------------------------------------------------------------------*/
850 
851 /* there are both host and device side versions of this call ... */
852 static int dummy_g_get_frame(struct usb_gadget *_gadget)
853 {
854 	struct timespec64 ts64;
855 
856 	ktime_get_ts64(&ts64);
857 	return ts64.tv_nsec / NSEC_PER_MSEC;
858 }
859 
860 static int dummy_wakeup(struct usb_gadget *_gadget)
861 {
862 	struct dummy_hcd *dum_hcd;
863 
864 	dum_hcd = gadget_to_dummy_hcd(_gadget);
865 	if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
866 				| (1 << USB_DEVICE_REMOTE_WAKEUP))))
867 		return -EINVAL;
868 	if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
869 		return -ENOLINK;
870 	if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
871 			 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
872 		return -EIO;
873 
874 	/* FIXME: What if the root hub is suspended but the port isn't? */
875 
876 	/* hub notices our request, issues downstream resume, etc */
877 	dum_hcd->resuming = 1;
878 	dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
879 	mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
880 	return 0;
881 }
882 
883 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
884 {
885 	struct dummy	*dum;
886 
887 	_gadget->is_selfpowered = (value != 0);
888 	dum = gadget_to_dummy_hcd(_gadget)->dum;
889 	if (value)
890 		dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
891 	else
892 		dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
893 	return 0;
894 }
895 
896 static void dummy_udc_update_ep0(struct dummy *dum)
897 {
898 	if (dum->gadget.speed == USB_SPEED_SUPER)
899 		dum->ep[0].ep.maxpacket = 9;
900 	else
901 		dum->ep[0].ep.maxpacket = 64;
902 }
903 
904 static int dummy_pullup(struct usb_gadget *_gadget, int value)
905 {
906 	struct dummy_hcd *dum_hcd;
907 	struct dummy	*dum;
908 	unsigned long	flags;
909 
910 	dum = gadget_dev_to_dummy(&_gadget->dev);
911 	dum_hcd = gadget_to_dummy_hcd(_gadget);
912 
913 	spin_lock_irqsave(&dum->lock, flags);
914 	dum->pullup = (value != 0);
915 	set_link_state(dum_hcd);
916 	spin_unlock_irqrestore(&dum->lock, flags);
917 
918 	usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
919 	return 0;
920 }
921 
922 static void dummy_udc_set_speed(struct usb_gadget *_gadget,
923 		enum usb_device_speed speed)
924 {
925 	struct dummy	*dum;
926 
927 	dum = gadget_dev_to_dummy(&_gadget->dev);
928 	dum->gadget.speed = speed;
929 	dummy_udc_update_ep0(dum);
930 }
931 
932 static int dummy_udc_start(struct usb_gadget *g,
933 		struct usb_gadget_driver *driver);
934 static int dummy_udc_stop(struct usb_gadget *g);
935 
936 static const struct usb_gadget_ops dummy_ops = {
937 	.get_frame	= dummy_g_get_frame,
938 	.wakeup		= dummy_wakeup,
939 	.set_selfpowered = dummy_set_selfpowered,
940 	.pullup		= dummy_pullup,
941 	.udc_start	= dummy_udc_start,
942 	.udc_stop	= dummy_udc_stop,
943 	.udc_set_speed	= dummy_udc_set_speed,
944 };
945 
946 /*-------------------------------------------------------------------------*/
947 
948 /* "function" sysfs attribute */
949 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
950 		char *buf)
951 {
952 	struct dummy	*dum = gadget_dev_to_dummy(dev);
953 
954 	if (!dum->driver || !dum->driver->function)
955 		return 0;
956 	return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
957 }
958 static DEVICE_ATTR_RO(function);
959 
960 /*-------------------------------------------------------------------------*/
961 
962 /*
963  * Driver registration/unregistration.
964  *
965  * This is basically hardware-specific; there's usually only one real USB
966  * device (not host) controller since that's how USB devices are intended
967  * to work.  So most implementations of these api calls will rely on the
968  * fact that only one driver will ever bind to the hardware.  But curious
969  * hardware can be built with discrete components, so the gadget API doesn't
970  * require that assumption.
971  *
972  * For this emulator, it might be convenient to create a usb slave device
973  * for each driver that registers:  just add to a big root hub.
974  */
975 
976 static int dummy_udc_start(struct usb_gadget *g,
977 		struct usb_gadget_driver *driver)
978 {
979 	struct dummy_hcd	*dum_hcd = gadget_to_dummy_hcd(g);
980 	struct dummy		*dum = dum_hcd->dum;
981 
982 	if (driver->max_speed == USB_SPEED_UNKNOWN)
983 		return -EINVAL;
984 
985 	/*
986 	 * SLAVE side init ... the layer above hardware, which
987 	 * can't enumerate without help from the driver we're binding.
988 	 */
989 
990 	spin_lock_irq(&dum->lock);
991 	dum->devstatus = 0;
992 	dum->driver = driver;
993 	dum->ints_enabled = 1;
994 	spin_unlock_irq(&dum->lock);
995 
996 	return 0;
997 }
998 
999 static int dummy_udc_stop(struct usb_gadget *g)
1000 {
1001 	struct dummy_hcd	*dum_hcd = gadget_to_dummy_hcd(g);
1002 	struct dummy		*dum = dum_hcd->dum;
1003 
1004 	spin_lock_irq(&dum->lock);
1005 	dum->ints_enabled = 0;
1006 	stop_activity(dum);
1007 
1008 	/* emulate synchronize_irq(): wait for callbacks to finish */
1009 	while (dum->callback_usage > 0) {
1010 		spin_unlock_irq(&dum->lock);
1011 		usleep_range(1000, 2000);
1012 		spin_lock_irq(&dum->lock);
1013 	}
1014 
1015 	dum->driver = NULL;
1016 	spin_unlock_irq(&dum->lock);
1017 
1018 	return 0;
1019 }
1020 
1021 #undef is_enabled
1022 
1023 /* The gadget structure is stored inside the hcd structure and will be
1024  * released along with it. */
1025 static void init_dummy_udc_hw(struct dummy *dum)
1026 {
1027 	int i;
1028 
1029 	INIT_LIST_HEAD(&dum->gadget.ep_list);
1030 	for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1031 		struct dummy_ep	*ep = &dum->ep[i];
1032 
1033 		if (!ep_info[i].name)
1034 			break;
1035 		ep->ep.name = ep_info[i].name;
1036 		ep->ep.caps = ep_info[i].caps;
1037 		ep->ep.ops = &dummy_ep_ops;
1038 		list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1039 		ep->halted = ep->wedged = ep->already_seen =
1040 				ep->setup_stage = 0;
1041 		usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1042 		ep->ep.max_streams = 16;
1043 		ep->last_io = jiffies;
1044 		ep->gadget = &dum->gadget;
1045 		ep->desc = NULL;
1046 		INIT_LIST_HEAD(&ep->queue);
1047 	}
1048 
1049 	dum->gadget.ep0 = &dum->ep[0].ep;
1050 	list_del_init(&dum->ep[0].ep.ep_list);
1051 	INIT_LIST_HEAD(&dum->fifo_req.queue);
1052 
1053 #ifdef CONFIG_USB_OTG
1054 	dum->gadget.is_otg = 1;
1055 #endif
1056 }
1057 
1058 static int dummy_udc_probe(struct platform_device *pdev)
1059 {
1060 	struct dummy	*dum;
1061 	int		rc;
1062 
1063 	dum = *((void **)dev_get_platdata(&pdev->dev));
1064 	/* Clear usb_gadget region for new registration to udc-core */
1065 	memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1066 	dum->gadget.name = gadget_name;
1067 	dum->gadget.ops = &dummy_ops;
1068 	if (mod_data.is_super_speed)
1069 		dum->gadget.max_speed = USB_SPEED_SUPER;
1070 	else if (mod_data.is_high_speed)
1071 		dum->gadget.max_speed = USB_SPEED_HIGH;
1072 	else
1073 		dum->gadget.max_speed = USB_SPEED_FULL;
1074 
1075 	dum->gadget.dev.parent = &pdev->dev;
1076 	init_dummy_udc_hw(dum);
1077 
1078 	rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1079 	if (rc < 0)
1080 		goto err_udc;
1081 
1082 	rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1083 	if (rc < 0)
1084 		goto err_dev;
1085 	platform_set_drvdata(pdev, dum);
1086 	return rc;
1087 
1088 err_dev:
1089 	usb_del_gadget_udc(&dum->gadget);
1090 err_udc:
1091 	return rc;
1092 }
1093 
1094 static int dummy_udc_remove(struct platform_device *pdev)
1095 {
1096 	struct dummy	*dum = platform_get_drvdata(pdev);
1097 
1098 	device_remove_file(&dum->gadget.dev, &dev_attr_function);
1099 	usb_del_gadget_udc(&dum->gadget);
1100 	return 0;
1101 }
1102 
1103 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1104 		int suspend)
1105 {
1106 	spin_lock_irq(&dum->lock);
1107 	dum->udc_suspended = suspend;
1108 	set_link_state(dum_hcd);
1109 	spin_unlock_irq(&dum->lock);
1110 }
1111 
1112 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1113 {
1114 	struct dummy		*dum = platform_get_drvdata(pdev);
1115 	struct dummy_hcd	*dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1116 
1117 	dev_dbg(&pdev->dev, "%s\n", __func__);
1118 	dummy_udc_pm(dum, dum_hcd, 1);
1119 	usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1120 	return 0;
1121 }
1122 
1123 static int dummy_udc_resume(struct platform_device *pdev)
1124 {
1125 	struct dummy		*dum = platform_get_drvdata(pdev);
1126 	struct dummy_hcd	*dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1127 
1128 	dev_dbg(&pdev->dev, "%s\n", __func__);
1129 	dummy_udc_pm(dum, dum_hcd, 0);
1130 	usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1131 	return 0;
1132 }
1133 
1134 static struct platform_driver dummy_udc_driver = {
1135 	.probe		= dummy_udc_probe,
1136 	.remove		= dummy_udc_remove,
1137 	.suspend	= dummy_udc_suspend,
1138 	.resume		= dummy_udc_resume,
1139 	.driver		= {
1140 		.name	= (char *) gadget_name,
1141 	},
1142 };
1143 
1144 /*-------------------------------------------------------------------------*/
1145 
1146 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1147 {
1148 	unsigned int index;
1149 
1150 	index = usb_endpoint_num(desc) << 1;
1151 	if (usb_endpoint_dir_in(desc))
1152 		index |= 1;
1153 	return index;
1154 }
1155 
1156 /* MASTER/HOST SIDE DRIVER
1157  *
1158  * this uses the hcd framework to hook up to host side drivers.
1159  * its root hub will only have one device, otherwise it acts like
1160  * a normal host controller.
1161  *
1162  * when urbs are queued, they're just stuck on a list that we
1163  * scan in a timer callback.  that callback connects writes from
1164  * the host with reads from the device, and so on, based on the
1165  * usb 2.0 rules.
1166  */
1167 
1168 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1169 {
1170 	const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1171 	u32 index;
1172 
1173 	if (!usb_endpoint_xfer_bulk(desc))
1174 		return 0;
1175 
1176 	index = dummy_get_ep_idx(desc);
1177 	return (1 << index) & dum_hcd->stream_en_ep;
1178 }
1179 
1180 /*
1181  * The max stream number is saved as a nibble so for the 30 possible endpoints
1182  * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1183  * means we use only 1 stream). The maximum according to the spec is 16bit so
1184  * if the 16 stream limit is about to go, the array size should be incremented
1185  * to 30 elements of type u16.
1186  */
1187 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1188 		unsigned int pipe)
1189 {
1190 	int max_streams;
1191 
1192 	max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1193 	if (usb_pipeout(pipe))
1194 		max_streams >>= 4;
1195 	else
1196 		max_streams &= 0xf;
1197 	max_streams++;
1198 	return max_streams;
1199 }
1200 
1201 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1202 		unsigned int pipe, unsigned int streams)
1203 {
1204 	int max_streams;
1205 
1206 	streams--;
1207 	max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1208 	if (usb_pipeout(pipe)) {
1209 		streams <<= 4;
1210 		max_streams &= 0xf;
1211 	} else {
1212 		max_streams &= 0xf0;
1213 	}
1214 	max_streams |= streams;
1215 	dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1216 }
1217 
1218 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1219 {
1220 	unsigned int max_streams;
1221 	int enabled;
1222 
1223 	enabled = dummy_ep_stream_en(dum_hcd, urb);
1224 	if (!urb->stream_id) {
1225 		if (enabled)
1226 			return -EINVAL;
1227 		return 0;
1228 	}
1229 	if (!enabled)
1230 		return -EINVAL;
1231 
1232 	max_streams = get_max_streams_for_pipe(dum_hcd,
1233 			usb_pipeendpoint(urb->pipe));
1234 	if (urb->stream_id > max_streams) {
1235 		dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1236 				urb->stream_id);
1237 		BUG();
1238 		return -EINVAL;
1239 	}
1240 	return 0;
1241 }
1242 
1243 static int dummy_urb_enqueue(
1244 	struct usb_hcd			*hcd,
1245 	struct urb			*urb,
1246 	gfp_t				mem_flags
1247 ) {
1248 	struct dummy_hcd *dum_hcd;
1249 	struct urbp	*urbp;
1250 	unsigned long	flags;
1251 	int		rc;
1252 
1253 	urbp = kmalloc(sizeof *urbp, mem_flags);
1254 	if (!urbp)
1255 		return -ENOMEM;
1256 	urbp->urb = urb;
1257 	urbp->miter_started = 0;
1258 
1259 	dum_hcd = hcd_to_dummy_hcd(hcd);
1260 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1261 
1262 	rc = dummy_validate_stream(dum_hcd, urb);
1263 	if (rc) {
1264 		kfree(urbp);
1265 		goto done;
1266 	}
1267 
1268 	rc = usb_hcd_link_urb_to_ep(hcd, urb);
1269 	if (rc) {
1270 		kfree(urbp);
1271 		goto done;
1272 	}
1273 
1274 	if (!dum_hcd->udev) {
1275 		dum_hcd->udev = urb->dev;
1276 		usb_get_dev(dum_hcd->udev);
1277 	} else if (unlikely(dum_hcd->udev != urb->dev))
1278 		dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1279 
1280 	list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1281 	urb->hcpriv = urbp;
1282 	if (!dum_hcd->next_frame_urbp)
1283 		dum_hcd->next_frame_urbp = urbp;
1284 	if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1285 		urb->error_count = 1;		/* mark as a new urb */
1286 
1287 	/* kick the scheduler, it'll do the rest */
1288 	if (!timer_pending(&dum_hcd->timer))
1289 		mod_timer(&dum_hcd->timer, jiffies + 1);
1290 
1291  done:
1292 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1293 	return rc;
1294 }
1295 
1296 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1297 {
1298 	struct dummy_hcd *dum_hcd;
1299 	unsigned long	flags;
1300 	int		rc;
1301 
1302 	/* giveback happens automatically in timer callback,
1303 	 * so make sure the callback happens */
1304 	dum_hcd = hcd_to_dummy_hcd(hcd);
1305 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1306 
1307 	rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1308 	if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1309 			!list_empty(&dum_hcd->urbp_list))
1310 		mod_timer(&dum_hcd->timer, jiffies);
1311 
1312 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1313 	return rc;
1314 }
1315 
1316 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1317 		u32 len)
1318 {
1319 	void *ubuf, *rbuf;
1320 	struct urbp *urbp = urb->hcpriv;
1321 	int to_host;
1322 	struct sg_mapping_iter *miter = &urbp->miter;
1323 	u32 trans = 0;
1324 	u32 this_sg;
1325 	bool next_sg;
1326 
1327 	to_host = usb_pipein(urb->pipe);
1328 	rbuf = req->req.buf + req->req.actual;
1329 
1330 	if (!urb->num_sgs) {
1331 		ubuf = urb->transfer_buffer + urb->actual_length;
1332 		if (to_host)
1333 			memcpy(ubuf, rbuf, len);
1334 		else
1335 			memcpy(rbuf, ubuf, len);
1336 		return len;
1337 	}
1338 
1339 	if (!urbp->miter_started) {
1340 		u32 flags = SG_MITER_ATOMIC;
1341 
1342 		if (to_host)
1343 			flags |= SG_MITER_TO_SG;
1344 		else
1345 			flags |= SG_MITER_FROM_SG;
1346 
1347 		sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1348 		urbp->miter_started = 1;
1349 	}
1350 	next_sg = sg_miter_next(miter);
1351 	if (next_sg == false) {
1352 		WARN_ON_ONCE(1);
1353 		return -EINVAL;
1354 	}
1355 	do {
1356 		ubuf = miter->addr;
1357 		this_sg = min_t(u32, len, miter->length);
1358 		miter->consumed = this_sg;
1359 		trans += this_sg;
1360 
1361 		if (to_host)
1362 			memcpy(ubuf, rbuf, this_sg);
1363 		else
1364 			memcpy(rbuf, ubuf, this_sg);
1365 		len -= this_sg;
1366 
1367 		if (!len)
1368 			break;
1369 		next_sg = sg_miter_next(miter);
1370 		if (next_sg == false) {
1371 			WARN_ON_ONCE(1);
1372 			return -EINVAL;
1373 		}
1374 
1375 		rbuf += this_sg;
1376 	} while (1);
1377 
1378 	sg_miter_stop(miter);
1379 	return trans;
1380 }
1381 
1382 /* transfer up to a frame's worth; caller must own lock */
1383 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1384 		struct dummy_ep *ep, int limit, int *status)
1385 {
1386 	struct dummy		*dum = dum_hcd->dum;
1387 	struct dummy_request	*req;
1388 	int			sent = 0;
1389 
1390 top:
1391 	/* if there's no request queued, the device is NAKing; return */
1392 	list_for_each_entry(req, &ep->queue, queue) {
1393 		unsigned	host_len, dev_len, len;
1394 		int		is_short, to_host;
1395 		int		rescan = 0;
1396 
1397 		if (dummy_ep_stream_en(dum_hcd, urb)) {
1398 			if ((urb->stream_id != req->req.stream_id))
1399 				continue;
1400 		}
1401 
1402 		/* 1..N packets of ep->ep.maxpacket each ... the last one
1403 		 * may be short (including zero length).
1404 		 *
1405 		 * writer can send a zlp explicitly (length 0) or implicitly
1406 		 * (length mod maxpacket zero, and 'zero' flag); they always
1407 		 * terminate reads.
1408 		 */
1409 		host_len = urb->transfer_buffer_length - urb->actual_length;
1410 		dev_len = req->req.length - req->req.actual;
1411 		len = min(host_len, dev_len);
1412 
1413 		/* FIXME update emulated data toggle too */
1414 
1415 		to_host = usb_pipein(urb->pipe);
1416 		if (unlikely(len == 0))
1417 			is_short = 1;
1418 		else {
1419 			/* not enough bandwidth left? */
1420 			if (limit < ep->ep.maxpacket && limit < len)
1421 				break;
1422 			len = min_t(unsigned, len, limit);
1423 			if (len == 0)
1424 				break;
1425 
1426 			/* send multiple of maxpacket first, then remainder */
1427 			if (len >= ep->ep.maxpacket) {
1428 				is_short = 0;
1429 				if (len % ep->ep.maxpacket)
1430 					rescan = 1;
1431 				len -= len % ep->ep.maxpacket;
1432 			} else {
1433 				is_short = 1;
1434 			}
1435 
1436 			len = dummy_perform_transfer(urb, req, len);
1437 
1438 			ep->last_io = jiffies;
1439 			if ((int)len < 0) {
1440 				req->req.status = len;
1441 			} else {
1442 				limit -= len;
1443 				sent += len;
1444 				urb->actual_length += len;
1445 				req->req.actual += len;
1446 			}
1447 		}
1448 
1449 		/* short packets terminate, maybe with overflow/underflow.
1450 		 * it's only really an error to write too much.
1451 		 *
1452 		 * partially filling a buffer optionally blocks queue advances
1453 		 * (so completion handlers can clean up the queue) but we don't
1454 		 * need to emulate such data-in-flight.
1455 		 */
1456 		if (is_short) {
1457 			if (host_len == dev_len) {
1458 				req->req.status = 0;
1459 				*status = 0;
1460 			} else if (to_host) {
1461 				req->req.status = 0;
1462 				if (dev_len > host_len)
1463 					*status = -EOVERFLOW;
1464 				else
1465 					*status = 0;
1466 			} else {
1467 				*status = 0;
1468 				if (host_len > dev_len)
1469 					req->req.status = -EOVERFLOW;
1470 				else
1471 					req->req.status = 0;
1472 			}
1473 
1474 		/*
1475 		 * many requests terminate without a short packet.
1476 		 * send a zlp if demanded by flags.
1477 		 */
1478 		} else {
1479 			if (req->req.length == req->req.actual) {
1480 				if (req->req.zero && to_host)
1481 					rescan = 1;
1482 				else
1483 					req->req.status = 0;
1484 			}
1485 			if (urb->transfer_buffer_length == urb->actual_length) {
1486 				if (urb->transfer_flags & URB_ZERO_PACKET &&
1487 				    !to_host)
1488 					rescan = 1;
1489 				else
1490 					*status = 0;
1491 			}
1492 		}
1493 
1494 		/* device side completion --> continuable */
1495 		if (req->req.status != -EINPROGRESS) {
1496 			list_del_init(&req->queue);
1497 
1498 			spin_unlock(&dum->lock);
1499 			usb_gadget_giveback_request(&ep->ep, &req->req);
1500 			spin_lock(&dum->lock);
1501 
1502 			/* requests might have been unlinked... */
1503 			rescan = 1;
1504 		}
1505 
1506 		/* host side completion --> terminate */
1507 		if (*status != -EINPROGRESS)
1508 			break;
1509 
1510 		/* rescan to continue with any other queued i/o */
1511 		if (rescan)
1512 			goto top;
1513 	}
1514 	return sent;
1515 }
1516 
1517 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1518 {
1519 	int	limit = ep->ep.maxpacket;
1520 
1521 	if (dum->gadget.speed == USB_SPEED_HIGH) {
1522 		int	tmp;
1523 
1524 		/* high bandwidth mode */
1525 		tmp = usb_endpoint_maxp_mult(ep->desc);
1526 		tmp *= 8 /* applies to entire frame */;
1527 		limit += limit * tmp;
1528 	}
1529 	if (dum->gadget.speed == USB_SPEED_SUPER) {
1530 		switch (usb_endpoint_type(ep->desc)) {
1531 		case USB_ENDPOINT_XFER_ISOC:
1532 			/* Sec. 4.4.8.2 USB3.0 Spec */
1533 			limit = 3 * 16 * 1024 * 8;
1534 			break;
1535 		case USB_ENDPOINT_XFER_INT:
1536 			/* Sec. 4.4.7.2 USB3.0 Spec */
1537 			limit = 3 * 1024 * 8;
1538 			break;
1539 		case USB_ENDPOINT_XFER_BULK:
1540 		default:
1541 			break;
1542 		}
1543 	}
1544 	return limit;
1545 }
1546 
1547 #define is_active(dum_hcd)	((dum_hcd->port_status & \
1548 		(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1549 			USB_PORT_STAT_SUSPEND)) \
1550 		== (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1551 
1552 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1553 {
1554 	int		i;
1555 
1556 	if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1557 			dum->ss_hcd : dum->hs_hcd)))
1558 		return NULL;
1559 	if (!dum->ints_enabled)
1560 		return NULL;
1561 	if ((address & ~USB_DIR_IN) == 0)
1562 		return &dum->ep[0];
1563 	for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1564 		struct dummy_ep	*ep = &dum->ep[i];
1565 
1566 		if (!ep->desc)
1567 			continue;
1568 		if (ep->desc->bEndpointAddress == address)
1569 			return ep;
1570 	}
1571 	return NULL;
1572 }
1573 
1574 #undef is_active
1575 
1576 #define Dev_Request	(USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1577 #define Dev_InRequest	(Dev_Request | USB_DIR_IN)
1578 #define Intf_Request	(USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1579 #define Intf_InRequest	(Intf_Request | USB_DIR_IN)
1580 #define Ep_Request	(USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1581 #define Ep_InRequest	(Ep_Request | USB_DIR_IN)
1582 
1583 
1584 /**
1585  * handle_control_request() - handles all control transfers
1586  * @dum: pointer to dummy (the_controller)
1587  * @urb: the urb request to handle
1588  * @setup: pointer to the setup data for a USB device control
1589  *	 request
1590  * @status: pointer to request handling status
1591  *
1592  * Return 0 - if the request was handled
1593  *	  1 - if the request wasn't handles
1594  *	  error code on error
1595  */
1596 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1597 				  struct usb_ctrlrequest *setup,
1598 				  int *status)
1599 {
1600 	struct dummy_ep		*ep2;
1601 	struct dummy		*dum = dum_hcd->dum;
1602 	int			ret_val = 1;
1603 	unsigned	w_index;
1604 	unsigned	w_value;
1605 
1606 	w_index = le16_to_cpu(setup->wIndex);
1607 	w_value = le16_to_cpu(setup->wValue);
1608 	switch (setup->bRequest) {
1609 	case USB_REQ_SET_ADDRESS:
1610 		if (setup->bRequestType != Dev_Request)
1611 			break;
1612 		dum->address = w_value;
1613 		*status = 0;
1614 		dev_dbg(udc_dev(dum), "set_address = %d\n",
1615 				w_value);
1616 		ret_val = 0;
1617 		break;
1618 	case USB_REQ_SET_FEATURE:
1619 		if (setup->bRequestType == Dev_Request) {
1620 			ret_val = 0;
1621 			switch (w_value) {
1622 			case USB_DEVICE_REMOTE_WAKEUP:
1623 				break;
1624 			case USB_DEVICE_B_HNP_ENABLE:
1625 				dum->gadget.b_hnp_enable = 1;
1626 				break;
1627 			case USB_DEVICE_A_HNP_SUPPORT:
1628 				dum->gadget.a_hnp_support = 1;
1629 				break;
1630 			case USB_DEVICE_A_ALT_HNP_SUPPORT:
1631 				dum->gadget.a_alt_hnp_support = 1;
1632 				break;
1633 			case USB_DEVICE_U1_ENABLE:
1634 				if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1635 				    HCD_USB3)
1636 					w_value = USB_DEV_STAT_U1_ENABLED;
1637 				else
1638 					ret_val = -EOPNOTSUPP;
1639 				break;
1640 			case USB_DEVICE_U2_ENABLE:
1641 				if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1642 				    HCD_USB3)
1643 					w_value = USB_DEV_STAT_U2_ENABLED;
1644 				else
1645 					ret_val = -EOPNOTSUPP;
1646 				break;
1647 			case USB_DEVICE_LTM_ENABLE:
1648 				if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1649 				    HCD_USB3)
1650 					w_value = USB_DEV_STAT_LTM_ENABLED;
1651 				else
1652 					ret_val = -EOPNOTSUPP;
1653 				break;
1654 			default:
1655 				ret_val = -EOPNOTSUPP;
1656 			}
1657 			if (ret_val == 0) {
1658 				dum->devstatus |= (1 << w_value);
1659 				*status = 0;
1660 			}
1661 		} else if (setup->bRequestType == Ep_Request) {
1662 			/* endpoint halt */
1663 			ep2 = find_endpoint(dum, w_index);
1664 			if (!ep2 || ep2->ep.name == ep0name) {
1665 				ret_val = -EOPNOTSUPP;
1666 				break;
1667 			}
1668 			ep2->halted = 1;
1669 			ret_val = 0;
1670 			*status = 0;
1671 		}
1672 		break;
1673 	case USB_REQ_CLEAR_FEATURE:
1674 		if (setup->bRequestType == Dev_Request) {
1675 			ret_val = 0;
1676 			switch (w_value) {
1677 			case USB_DEVICE_REMOTE_WAKEUP:
1678 				w_value = USB_DEVICE_REMOTE_WAKEUP;
1679 				break;
1680 			case USB_DEVICE_U1_ENABLE:
1681 				if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1682 				    HCD_USB3)
1683 					w_value = USB_DEV_STAT_U1_ENABLED;
1684 				else
1685 					ret_val = -EOPNOTSUPP;
1686 				break;
1687 			case USB_DEVICE_U2_ENABLE:
1688 				if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1689 				    HCD_USB3)
1690 					w_value = USB_DEV_STAT_U2_ENABLED;
1691 				else
1692 					ret_val = -EOPNOTSUPP;
1693 				break;
1694 			case USB_DEVICE_LTM_ENABLE:
1695 				if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1696 				    HCD_USB3)
1697 					w_value = USB_DEV_STAT_LTM_ENABLED;
1698 				else
1699 					ret_val = -EOPNOTSUPP;
1700 				break;
1701 			default:
1702 				ret_val = -EOPNOTSUPP;
1703 				break;
1704 			}
1705 			if (ret_val == 0) {
1706 				dum->devstatus &= ~(1 << w_value);
1707 				*status = 0;
1708 			}
1709 		} else if (setup->bRequestType == Ep_Request) {
1710 			/* endpoint halt */
1711 			ep2 = find_endpoint(dum, w_index);
1712 			if (!ep2) {
1713 				ret_val = -EOPNOTSUPP;
1714 				break;
1715 			}
1716 			if (!ep2->wedged)
1717 				ep2->halted = 0;
1718 			ret_val = 0;
1719 			*status = 0;
1720 		}
1721 		break;
1722 	case USB_REQ_GET_STATUS:
1723 		if (setup->bRequestType == Dev_InRequest
1724 				|| setup->bRequestType == Intf_InRequest
1725 				|| setup->bRequestType == Ep_InRequest) {
1726 			char *buf;
1727 			/*
1728 			 * device: remote wakeup, selfpowered
1729 			 * interface: nothing
1730 			 * endpoint: halt
1731 			 */
1732 			buf = (char *)urb->transfer_buffer;
1733 			if (urb->transfer_buffer_length > 0) {
1734 				if (setup->bRequestType == Ep_InRequest) {
1735 					ep2 = find_endpoint(dum, w_index);
1736 					if (!ep2) {
1737 						ret_val = -EOPNOTSUPP;
1738 						break;
1739 					}
1740 					buf[0] = ep2->halted;
1741 				} else if (setup->bRequestType ==
1742 					   Dev_InRequest) {
1743 					buf[0] = (u8)dum->devstatus;
1744 				} else
1745 					buf[0] = 0;
1746 			}
1747 			if (urb->transfer_buffer_length > 1)
1748 				buf[1] = 0;
1749 			urb->actual_length = min_t(u32, 2,
1750 				urb->transfer_buffer_length);
1751 			ret_val = 0;
1752 			*status = 0;
1753 		}
1754 		break;
1755 	}
1756 	return ret_val;
1757 }
1758 
1759 /* drive both sides of the transfers; looks like irq handlers to
1760  * both drivers except the callbacks aren't in_irq().
1761  */
1762 static void dummy_timer(struct timer_list *t)
1763 {
1764 	struct dummy_hcd	*dum_hcd = from_timer(dum_hcd, t, timer);
1765 	struct dummy		*dum = dum_hcd->dum;
1766 	struct urbp		*urbp, *tmp;
1767 	unsigned long		flags;
1768 	int			limit, total;
1769 	int			i;
1770 
1771 	/* simplistic model for one frame's bandwidth */
1772 	/* FIXME: account for transaction and packet overhead */
1773 	switch (dum->gadget.speed) {
1774 	case USB_SPEED_LOW:
1775 		total = 8/*bytes*/ * 12/*packets*/;
1776 		break;
1777 	case USB_SPEED_FULL:
1778 		total = 64/*bytes*/ * 19/*packets*/;
1779 		break;
1780 	case USB_SPEED_HIGH:
1781 		total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1782 		break;
1783 	case USB_SPEED_SUPER:
1784 		/* Bus speed is 500000 bytes/ms, so use a little less */
1785 		total = 490000;
1786 		break;
1787 	default:
1788 		dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1789 		return;
1790 	}
1791 
1792 	/* FIXME if HZ != 1000 this will probably misbehave ... */
1793 
1794 	/* look at each urb queued by the host side driver */
1795 	spin_lock_irqsave(&dum->lock, flags);
1796 
1797 	if (!dum_hcd->udev) {
1798 		dev_err(dummy_dev(dum_hcd),
1799 				"timer fired with no URBs pending?\n");
1800 		spin_unlock_irqrestore(&dum->lock, flags);
1801 		return;
1802 	}
1803 	dum_hcd->next_frame_urbp = NULL;
1804 
1805 	for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1806 		if (!ep_info[i].name)
1807 			break;
1808 		dum->ep[i].already_seen = 0;
1809 	}
1810 
1811 restart:
1812 	list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1813 		struct urb		*urb;
1814 		struct dummy_request	*req;
1815 		u8			address;
1816 		struct dummy_ep		*ep = NULL;
1817 		int			status = -EINPROGRESS;
1818 
1819 		/* stop when we reach URBs queued after the timer interrupt */
1820 		if (urbp == dum_hcd->next_frame_urbp)
1821 			break;
1822 
1823 		urb = urbp->urb;
1824 		if (urb->unlinked)
1825 			goto return_urb;
1826 		else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1827 			continue;
1828 
1829 		/* Used up this frame's bandwidth? */
1830 		if (total <= 0)
1831 			break;
1832 
1833 		/* find the gadget's ep for this request (if configured) */
1834 		address = usb_pipeendpoint (urb->pipe);
1835 		if (usb_pipein(urb->pipe))
1836 			address |= USB_DIR_IN;
1837 		ep = find_endpoint(dum, address);
1838 		if (!ep) {
1839 			/* set_configuration() disagreement */
1840 			dev_dbg(dummy_dev(dum_hcd),
1841 				"no ep configured for urb %p\n",
1842 				urb);
1843 			status = -EPROTO;
1844 			goto return_urb;
1845 		}
1846 
1847 		if (ep->already_seen)
1848 			continue;
1849 		ep->already_seen = 1;
1850 		if (ep == &dum->ep[0] && urb->error_count) {
1851 			ep->setup_stage = 1;	/* a new urb */
1852 			urb->error_count = 0;
1853 		}
1854 		if (ep->halted && !ep->setup_stage) {
1855 			/* NOTE: must not be iso! */
1856 			dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1857 					ep->ep.name, urb);
1858 			status = -EPIPE;
1859 			goto return_urb;
1860 		}
1861 		/* FIXME make sure both ends agree on maxpacket */
1862 
1863 		/* handle control requests */
1864 		if (ep == &dum->ep[0] && ep->setup_stage) {
1865 			struct usb_ctrlrequest		setup;
1866 			int				value = 1;
1867 
1868 			setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1869 			/* paranoia, in case of stale queued data */
1870 			list_for_each_entry(req, &ep->queue, queue) {
1871 				list_del_init(&req->queue);
1872 				req->req.status = -EOVERFLOW;
1873 				dev_dbg(udc_dev(dum), "stale req = %p\n",
1874 						req);
1875 
1876 				spin_unlock(&dum->lock);
1877 				usb_gadget_giveback_request(&ep->ep, &req->req);
1878 				spin_lock(&dum->lock);
1879 				ep->already_seen = 0;
1880 				goto restart;
1881 			}
1882 
1883 			/* gadget driver never sees set_address or operations
1884 			 * on standard feature flags.  some hardware doesn't
1885 			 * even expose them.
1886 			 */
1887 			ep->last_io = jiffies;
1888 			ep->setup_stage = 0;
1889 			ep->halted = 0;
1890 
1891 			value = handle_control_request(dum_hcd, urb, &setup,
1892 						       &status);
1893 
1894 			/* gadget driver handles all other requests.  block
1895 			 * until setup() returns; no reentrancy issues etc.
1896 			 */
1897 			if (value > 0) {
1898 				++dum->callback_usage;
1899 				spin_unlock(&dum->lock);
1900 				value = dum->driver->setup(&dum->gadget,
1901 						&setup);
1902 				spin_lock(&dum->lock);
1903 				--dum->callback_usage;
1904 
1905 				if (value >= 0) {
1906 					/* no delays (max 64KB data stage) */
1907 					limit = 64*1024;
1908 					goto treat_control_like_bulk;
1909 				}
1910 				/* error, see below */
1911 			}
1912 
1913 			if (value < 0) {
1914 				if (value != -EOPNOTSUPP)
1915 					dev_dbg(udc_dev(dum),
1916 						"setup --> %d\n",
1917 						value);
1918 				status = -EPIPE;
1919 				urb->actual_length = 0;
1920 			}
1921 
1922 			goto return_urb;
1923 		}
1924 
1925 		/* non-control requests */
1926 		limit = total;
1927 		switch (usb_pipetype(urb->pipe)) {
1928 		case PIPE_ISOCHRONOUS:
1929 			/*
1930 			 * We don't support isochronous.  But if we did,
1931 			 * here are some of the issues we'd have to face:
1932 			 *
1933 			 * Is it urb->interval since the last xfer?
1934 			 * Use urb->iso_frame_desc[i].
1935 			 * Complete whether or not ep has requests queued.
1936 			 * Report random errors, to debug drivers.
1937 			 */
1938 			limit = max(limit, periodic_bytes(dum, ep));
1939 			status = -EINVAL;	/* fail all xfers */
1940 			break;
1941 
1942 		case PIPE_INTERRUPT:
1943 			/* FIXME is it urb->interval since the last xfer?
1944 			 * this almost certainly polls too fast.
1945 			 */
1946 			limit = max(limit, periodic_bytes(dum, ep));
1947 			/* FALLTHROUGH */
1948 
1949 		default:
1950 treat_control_like_bulk:
1951 			ep->last_io = jiffies;
1952 			total -= transfer(dum_hcd, urb, ep, limit, &status);
1953 			break;
1954 		}
1955 
1956 		/* incomplete transfer? */
1957 		if (status == -EINPROGRESS)
1958 			continue;
1959 
1960 return_urb:
1961 		list_del(&urbp->urbp_list);
1962 		kfree(urbp);
1963 		if (ep)
1964 			ep->already_seen = ep->setup_stage = 0;
1965 
1966 		usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1967 		spin_unlock(&dum->lock);
1968 		usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1969 		spin_lock(&dum->lock);
1970 
1971 		goto restart;
1972 	}
1973 
1974 	if (list_empty(&dum_hcd->urbp_list)) {
1975 		usb_put_dev(dum_hcd->udev);
1976 		dum_hcd->udev = NULL;
1977 	} else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1978 		/* want a 1 msec delay here */
1979 		mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1980 	}
1981 
1982 	spin_unlock_irqrestore(&dum->lock, flags);
1983 }
1984 
1985 /*-------------------------------------------------------------------------*/
1986 
1987 #define PORT_C_MASK \
1988 	((USB_PORT_STAT_C_CONNECTION \
1989 	| USB_PORT_STAT_C_ENABLE \
1990 	| USB_PORT_STAT_C_SUSPEND \
1991 	| USB_PORT_STAT_C_OVERCURRENT \
1992 	| USB_PORT_STAT_C_RESET) << 16)
1993 
1994 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1995 {
1996 	struct dummy_hcd	*dum_hcd;
1997 	unsigned long		flags;
1998 	int			retval = 0;
1999 
2000 	dum_hcd = hcd_to_dummy_hcd(hcd);
2001 
2002 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2003 	if (!HCD_HW_ACCESSIBLE(hcd))
2004 		goto done;
2005 
2006 	if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2007 		dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2008 		dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2009 		set_link_state(dum_hcd);
2010 	}
2011 
2012 	if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2013 		*buf = (1 << 1);
2014 		dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2015 				dum_hcd->port_status);
2016 		retval = 1;
2017 		if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2018 			usb_hcd_resume_root_hub(hcd);
2019 	}
2020 done:
2021 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2022 	return retval;
2023 }
2024 
2025 /* usb 3.0 root hub device descriptor */
2026 static struct {
2027 	struct usb_bos_descriptor bos;
2028 	struct usb_ss_cap_descriptor ss_cap;
2029 } __packed usb3_bos_desc = {
2030 
2031 	.bos = {
2032 		.bLength		= USB_DT_BOS_SIZE,
2033 		.bDescriptorType	= USB_DT_BOS,
2034 		.wTotalLength		= cpu_to_le16(sizeof(usb3_bos_desc)),
2035 		.bNumDeviceCaps		= 1,
2036 	},
2037 	.ss_cap = {
2038 		.bLength		= USB_DT_USB_SS_CAP_SIZE,
2039 		.bDescriptorType	= USB_DT_DEVICE_CAPABILITY,
2040 		.bDevCapabilityType	= USB_SS_CAP_TYPE,
2041 		.wSpeedSupported	= cpu_to_le16(USB_5GBPS_OPERATION),
2042 		.bFunctionalitySupport	= ilog2(USB_5GBPS_OPERATION),
2043 	},
2044 };
2045 
2046 static inline void
2047 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2048 {
2049 	memset(desc, 0, sizeof *desc);
2050 	desc->bDescriptorType = USB_DT_SS_HUB;
2051 	desc->bDescLength = 12;
2052 	desc->wHubCharacteristics = cpu_to_le16(
2053 			HUB_CHAR_INDV_PORT_LPSM |
2054 			HUB_CHAR_COMMON_OCPM);
2055 	desc->bNbrPorts = 1;
2056 	desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2057 	desc->u.ss.DeviceRemovable = 0;
2058 }
2059 
2060 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2061 {
2062 	memset(desc, 0, sizeof *desc);
2063 	desc->bDescriptorType = USB_DT_HUB;
2064 	desc->bDescLength = 9;
2065 	desc->wHubCharacteristics = cpu_to_le16(
2066 			HUB_CHAR_INDV_PORT_LPSM |
2067 			HUB_CHAR_COMMON_OCPM);
2068 	desc->bNbrPorts = 1;
2069 	desc->u.hs.DeviceRemovable[0] = 0;
2070 	desc->u.hs.DeviceRemovable[1] = 0xff;	/* PortPwrCtrlMask */
2071 }
2072 
2073 static int dummy_hub_control(
2074 	struct usb_hcd	*hcd,
2075 	u16		typeReq,
2076 	u16		wValue,
2077 	u16		wIndex,
2078 	char		*buf,
2079 	u16		wLength
2080 ) {
2081 	struct dummy_hcd *dum_hcd;
2082 	int		retval = 0;
2083 	unsigned long	flags;
2084 
2085 	if (!HCD_HW_ACCESSIBLE(hcd))
2086 		return -ETIMEDOUT;
2087 
2088 	dum_hcd = hcd_to_dummy_hcd(hcd);
2089 
2090 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2091 	switch (typeReq) {
2092 	case ClearHubFeature:
2093 		break;
2094 	case ClearPortFeature:
2095 		switch (wValue) {
2096 		case USB_PORT_FEAT_SUSPEND:
2097 			if (hcd->speed == HCD_USB3) {
2098 				dev_dbg(dummy_dev(dum_hcd),
2099 					 "USB_PORT_FEAT_SUSPEND req not "
2100 					 "supported for USB 3.0 roothub\n");
2101 				goto error;
2102 			}
2103 			if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2104 				/* 20msec resume signaling */
2105 				dum_hcd->resuming = 1;
2106 				dum_hcd->re_timeout = jiffies +
2107 						msecs_to_jiffies(20);
2108 			}
2109 			break;
2110 		case USB_PORT_FEAT_POWER:
2111 			dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2112 			if (hcd->speed == HCD_USB3)
2113 				dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2114 			else
2115 				dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2116 			set_link_state(dum_hcd);
2117 			break;
2118 		default:
2119 			dum_hcd->port_status &= ~(1 << wValue);
2120 			set_link_state(dum_hcd);
2121 		}
2122 		break;
2123 	case GetHubDescriptor:
2124 		if (hcd->speed == HCD_USB3 &&
2125 				(wLength < USB_DT_SS_HUB_SIZE ||
2126 				 wValue != (USB_DT_SS_HUB << 8))) {
2127 			dev_dbg(dummy_dev(dum_hcd),
2128 				"Wrong hub descriptor type for "
2129 				"USB 3.0 roothub.\n");
2130 			goto error;
2131 		}
2132 		if (hcd->speed == HCD_USB3)
2133 			ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2134 		else
2135 			hub_descriptor((struct usb_hub_descriptor *) buf);
2136 		break;
2137 
2138 	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2139 		if (hcd->speed != HCD_USB3)
2140 			goto error;
2141 
2142 		if ((wValue >> 8) != USB_DT_BOS)
2143 			goto error;
2144 
2145 		memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2146 		retval = sizeof(usb3_bos_desc);
2147 		break;
2148 
2149 	case GetHubStatus:
2150 		*(__le32 *) buf = cpu_to_le32(0);
2151 		break;
2152 	case GetPortStatus:
2153 		if (wIndex != 1)
2154 			retval = -EPIPE;
2155 
2156 		/* whoever resets or resumes must GetPortStatus to
2157 		 * complete it!!
2158 		 */
2159 		if (dum_hcd->resuming &&
2160 				time_after_eq(jiffies, dum_hcd->re_timeout)) {
2161 			dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2162 			dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2163 		}
2164 		if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2165 				time_after_eq(jiffies, dum_hcd->re_timeout)) {
2166 			dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2167 			dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2168 			if (dum_hcd->dum->pullup) {
2169 				dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2170 
2171 				if (hcd->speed < HCD_USB3) {
2172 					switch (dum_hcd->dum->gadget.speed) {
2173 					case USB_SPEED_HIGH:
2174 						dum_hcd->port_status |=
2175 						      USB_PORT_STAT_HIGH_SPEED;
2176 						break;
2177 					case USB_SPEED_LOW:
2178 						dum_hcd->dum->gadget.ep0->
2179 							maxpacket = 8;
2180 						dum_hcd->port_status |=
2181 							USB_PORT_STAT_LOW_SPEED;
2182 						break;
2183 					default:
2184 						break;
2185 					}
2186 				}
2187 			}
2188 		}
2189 		set_link_state(dum_hcd);
2190 		((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2191 		((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2192 		break;
2193 	case SetHubFeature:
2194 		retval = -EPIPE;
2195 		break;
2196 	case SetPortFeature:
2197 		switch (wValue) {
2198 		case USB_PORT_FEAT_LINK_STATE:
2199 			if (hcd->speed != HCD_USB3) {
2200 				dev_dbg(dummy_dev(dum_hcd),
2201 					 "USB_PORT_FEAT_LINK_STATE req not "
2202 					 "supported for USB 2.0 roothub\n");
2203 				goto error;
2204 			}
2205 			/*
2206 			 * Since this is dummy we don't have an actual link so
2207 			 * there is nothing to do for the SET_LINK_STATE cmd
2208 			 */
2209 			break;
2210 		case USB_PORT_FEAT_U1_TIMEOUT:
2211 		case USB_PORT_FEAT_U2_TIMEOUT:
2212 			/* TODO: add suspend/resume support! */
2213 			if (hcd->speed != HCD_USB3) {
2214 				dev_dbg(dummy_dev(dum_hcd),
2215 					 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2216 					 "supported for USB 2.0 roothub\n");
2217 				goto error;
2218 			}
2219 			break;
2220 		case USB_PORT_FEAT_SUSPEND:
2221 			/* Applicable only for USB2.0 hub */
2222 			if (hcd->speed == HCD_USB3) {
2223 				dev_dbg(dummy_dev(dum_hcd),
2224 					 "USB_PORT_FEAT_SUSPEND req not "
2225 					 "supported for USB 3.0 roothub\n");
2226 				goto error;
2227 			}
2228 			if (dum_hcd->active) {
2229 				dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2230 
2231 				/* HNP would happen here; for now we
2232 				 * assume b_bus_req is always true.
2233 				 */
2234 				set_link_state(dum_hcd);
2235 				if (((1 << USB_DEVICE_B_HNP_ENABLE)
2236 						& dum_hcd->dum->devstatus) != 0)
2237 					dev_dbg(dummy_dev(dum_hcd),
2238 							"no HNP yet!\n");
2239 			}
2240 			break;
2241 		case USB_PORT_FEAT_POWER:
2242 			if (hcd->speed == HCD_USB3)
2243 				dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2244 			else
2245 				dum_hcd->port_status |= USB_PORT_STAT_POWER;
2246 			set_link_state(dum_hcd);
2247 			break;
2248 		case USB_PORT_FEAT_BH_PORT_RESET:
2249 			/* Applicable only for USB3.0 hub */
2250 			if (hcd->speed != HCD_USB3) {
2251 				dev_dbg(dummy_dev(dum_hcd),
2252 					 "USB_PORT_FEAT_BH_PORT_RESET req not "
2253 					 "supported for USB 2.0 roothub\n");
2254 				goto error;
2255 			}
2256 			/* FALLS THROUGH */
2257 		case USB_PORT_FEAT_RESET:
2258 			/* if it's already enabled, disable */
2259 			if (hcd->speed == HCD_USB3) {
2260 				dum_hcd->port_status = 0;
2261 				dum_hcd->port_status =
2262 					(USB_SS_PORT_STAT_POWER |
2263 					 USB_PORT_STAT_CONNECTION |
2264 					 USB_PORT_STAT_RESET);
2265 			} else
2266 				dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2267 					| USB_PORT_STAT_LOW_SPEED
2268 					| USB_PORT_STAT_HIGH_SPEED);
2269 			/*
2270 			 * We want to reset device status. All but the
2271 			 * Self powered feature
2272 			 */
2273 			dum_hcd->dum->devstatus &=
2274 				(1 << USB_DEVICE_SELF_POWERED);
2275 			/*
2276 			 * FIXME USB3.0: what is the correct reset signaling
2277 			 * interval? Is it still 50msec as for HS?
2278 			 */
2279 			dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2280 			/* FALLS THROUGH */
2281 		default:
2282 			if (hcd->speed == HCD_USB3) {
2283 				if ((dum_hcd->port_status &
2284 				     USB_SS_PORT_STAT_POWER) != 0) {
2285 					dum_hcd->port_status |= (1 << wValue);
2286 				}
2287 			} else
2288 				if ((dum_hcd->port_status &
2289 				     USB_PORT_STAT_POWER) != 0) {
2290 					dum_hcd->port_status |= (1 << wValue);
2291 				}
2292 			set_link_state(dum_hcd);
2293 		}
2294 		break;
2295 	case GetPortErrorCount:
2296 		if (hcd->speed != HCD_USB3) {
2297 			dev_dbg(dummy_dev(dum_hcd),
2298 				 "GetPortErrorCount req not "
2299 				 "supported for USB 2.0 roothub\n");
2300 			goto error;
2301 		}
2302 		/* We'll always return 0 since this is a dummy hub */
2303 		*(__le32 *) buf = cpu_to_le32(0);
2304 		break;
2305 	case SetHubDepth:
2306 		if (hcd->speed != HCD_USB3) {
2307 			dev_dbg(dummy_dev(dum_hcd),
2308 				 "SetHubDepth req not supported for "
2309 				 "USB 2.0 roothub\n");
2310 			goto error;
2311 		}
2312 		break;
2313 	default:
2314 		dev_dbg(dummy_dev(dum_hcd),
2315 			"hub control req%04x v%04x i%04x l%d\n",
2316 			typeReq, wValue, wIndex, wLength);
2317 error:
2318 		/* "protocol stall" on error */
2319 		retval = -EPIPE;
2320 	}
2321 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2322 
2323 	if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2324 		usb_hcd_poll_rh_status(hcd);
2325 	return retval;
2326 }
2327 
2328 static int dummy_bus_suspend(struct usb_hcd *hcd)
2329 {
2330 	struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2331 
2332 	dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2333 
2334 	spin_lock_irq(&dum_hcd->dum->lock);
2335 	dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2336 	set_link_state(dum_hcd);
2337 	hcd->state = HC_STATE_SUSPENDED;
2338 	spin_unlock_irq(&dum_hcd->dum->lock);
2339 	return 0;
2340 }
2341 
2342 static int dummy_bus_resume(struct usb_hcd *hcd)
2343 {
2344 	struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2345 	int rc = 0;
2346 
2347 	dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2348 
2349 	spin_lock_irq(&dum_hcd->dum->lock);
2350 	if (!HCD_HW_ACCESSIBLE(hcd)) {
2351 		rc = -ESHUTDOWN;
2352 	} else {
2353 		dum_hcd->rh_state = DUMMY_RH_RUNNING;
2354 		set_link_state(dum_hcd);
2355 		if (!list_empty(&dum_hcd->urbp_list))
2356 			mod_timer(&dum_hcd->timer, jiffies);
2357 		hcd->state = HC_STATE_RUNNING;
2358 	}
2359 	spin_unlock_irq(&dum_hcd->dum->lock);
2360 	return rc;
2361 }
2362 
2363 /*-------------------------------------------------------------------------*/
2364 
2365 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2366 {
2367 	int ep = usb_pipeendpoint(urb->pipe);
2368 
2369 	return scnprintf(buf, size,
2370 		"urb/%p %s ep%d%s%s len %d/%d\n",
2371 		urb,
2372 		({ char *s;
2373 		switch (urb->dev->speed) {
2374 		case USB_SPEED_LOW:
2375 			s = "ls";
2376 			break;
2377 		case USB_SPEED_FULL:
2378 			s = "fs";
2379 			break;
2380 		case USB_SPEED_HIGH:
2381 			s = "hs";
2382 			break;
2383 		case USB_SPEED_SUPER:
2384 			s = "ss";
2385 			break;
2386 		default:
2387 			s = "?";
2388 			break;
2389 		 } s; }),
2390 		ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2391 		({ char *s; \
2392 		switch (usb_pipetype(urb->pipe)) { \
2393 		case PIPE_CONTROL: \
2394 			s = ""; \
2395 			break; \
2396 		case PIPE_BULK: \
2397 			s = "-bulk"; \
2398 			break; \
2399 		case PIPE_INTERRUPT: \
2400 			s = "-int"; \
2401 			break; \
2402 		default: \
2403 			s = "-iso"; \
2404 			break; \
2405 		} s; }),
2406 		urb->actual_length, urb->transfer_buffer_length);
2407 }
2408 
2409 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2410 		char *buf)
2411 {
2412 	struct usb_hcd		*hcd = dev_get_drvdata(dev);
2413 	struct dummy_hcd	*dum_hcd = hcd_to_dummy_hcd(hcd);
2414 	struct urbp		*urbp;
2415 	size_t			size = 0;
2416 	unsigned long		flags;
2417 
2418 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2419 	list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2420 		size_t		temp;
2421 
2422 		temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2423 		buf += temp;
2424 		size += temp;
2425 	}
2426 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2427 
2428 	return size;
2429 }
2430 static DEVICE_ATTR_RO(urbs);
2431 
2432 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2433 {
2434 	timer_setup(&dum_hcd->timer, dummy_timer, 0);
2435 	dum_hcd->rh_state = DUMMY_RH_RUNNING;
2436 	dum_hcd->stream_en_ep = 0;
2437 	INIT_LIST_HEAD(&dum_hcd->urbp_list);
2438 	dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2439 	dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2440 	dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2441 #ifdef CONFIG_USB_OTG
2442 	dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2443 #endif
2444 	return 0;
2445 
2446 	/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2447 	return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2448 }
2449 
2450 static int dummy_start(struct usb_hcd *hcd)
2451 {
2452 	struct dummy_hcd	*dum_hcd = hcd_to_dummy_hcd(hcd);
2453 
2454 	/*
2455 	 * MASTER side init ... we emulate a root hub that'll only ever
2456 	 * talk to one device (the slave side).  Also appears in sysfs,
2457 	 * just like more familiar pci-based HCDs.
2458 	 */
2459 	if (!usb_hcd_is_primary_hcd(hcd))
2460 		return dummy_start_ss(dum_hcd);
2461 
2462 	spin_lock_init(&dum_hcd->dum->lock);
2463 	timer_setup(&dum_hcd->timer, dummy_timer, 0);
2464 	dum_hcd->rh_state = DUMMY_RH_RUNNING;
2465 
2466 	INIT_LIST_HEAD(&dum_hcd->urbp_list);
2467 
2468 	hcd->power_budget = POWER_BUDGET;
2469 	hcd->state = HC_STATE_RUNNING;
2470 	hcd->uses_new_polling = 1;
2471 
2472 #ifdef CONFIG_USB_OTG
2473 	hcd->self.otg_port = 1;
2474 #endif
2475 
2476 	/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2477 	return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2478 }
2479 
2480 static void dummy_stop(struct usb_hcd *hcd)
2481 {
2482 	device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2483 	dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2484 }
2485 
2486 /*-------------------------------------------------------------------------*/
2487 
2488 static int dummy_h_get_frame(struct usb_hcd *hcd)
2489 {
2490 	return dummy_g_get_frame(NULL);
2491 }
2492 
2493 static int dummy_setup(struct usb_hcd *hcd)
2494 {
2495 	struct dummy *dum;
2496 
2497 	dum = *((void **)dev_get_platdata(hcd->self.controller));
2498 	hcd->self.sg_tablesize = ~0;
2499 	if (usb_hcd_is_primary_hcd(hcd)) {
2500 		dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2501 		dum->hs_hcd->dum = dum;
2502 		/*
2503 		 * Mark the first roothub as being USB 2.0.
2504 		 * The USB 3.0 roothub will be registered later by
2505 		 * dummy_hcd_probe()
2506 		 */
2507 		hcd->speed = HCD_USB2;
2508 		hcd->self.root_hub->speed = USB_SPEED_HIGH;
2509 	} else {
2510 		dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2511 		dum->ss_hcd->dum = dum;
2512 		hcd->speed = HCD_USB3;
2513 		hcd->self.root_hub->speed = USB_SPEED_SUPER;
2514 	}
2515 	return 0;
2516 }
2517 
2518 /* Change a group of bulk endpoints to support multiple stream IDs */
2519 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2520 	struct usb_host_endpoint **eps, unsigned int num_eps,
2521 	unsigned int num_streams, gfp_t mem_flags)
2522 {
2523 	struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2524 	unsigned long flags;
2525 	int max_stream;
2526 	int ret_streams = num_streams;
2527 	unsigned int index;
2528 	unsigned int i;
2529 
2530 	if (!num_eps)
2531 		return -EINVAL;
2532 
2533 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2534 	for (i = 0; i < num_eps; i++) {
2535 		index = dummy_get_ep_idx(&eps[i]->desc);
2536 		if ((1 << index) & dum_hcd->stream_en_ep) {
2537 			ret_streams = -EINVAL;
2538 			goto out;
2539 		}
2540 		max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2541 		if (!max_stream) {
2542 			ret_streams = -EINVAL;
2543 			goto out;
2544 		}
2545 		if (max_stream < ret_streams) {
2546 			dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2547 					"stream IDs.\n",
2548 					eps[i]->desc.bEndpointAddress,
2549 					max_stream);
2550 			ret_streams = max_stream;
2551 		}
2552 	}
2553 
2554 	for (i = 0; i < num_eps; i++) {
2555 		index = dummy_get_ep_idx(&eps[i]->desc);
2556 		dum_hcd->stream_en_ep |= 1 << index;
2557 		set_max_streams_for_pipe(dum_hcd,
2558 				usb_endpoint_num(&eps[i]->desc), ret_streams);
2559 	}
2560 out:
2561 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2562 	return ret_streams;
2563 }
2564 
2565 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2566 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2567 	struct usb_host_endpoint **eps, unsigned int num_eps,
2568 	gfp_t mem_flags)
2569 {
2570 	struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2571 	unsigned long flags;
2572 	int ret;
2573 	unsigned int index;
2574 	unsigned int i;
2575 
2576 	spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2577 	for (i = 0; i < num_eps; i++) {
2578 		index = dummy_get_ep_idx(&eps[i]->desc);
2579 		if (!((1 << index) & dum_hcd->stream_en_ep)) {
2580 			ret = -EINVAL;
2581 			goto out;
2582 		}
2583 	}
2584 
2585 	for (i = 0; i < num_eps; i++) {
2586 		index = dummy_get_ep_idx(&eps[i]->desc);
2587 		dum_hcd->stream_en_ep &= ~(1 << index);
2588 		set_max_streams_for_pipe(dum_hcd,
2589 				usb_endpoint_num(&eps[i]->desc), 0);
2590 	}
2591 	ret = 0;
2592 out:
2593 	spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2594 	return ret;
2595 }
2596 
2597 static struct hc_driver dummy_hcd = {
2598 	.description =		(char *) driver_name,
2599 	.product_desc =		"Dummy host controller",
2600 	.hcd_priv_size =	sizeof(struct dummy_hcd),
2601 
2602 	.reset =		dummy_setup,
2603 	.start =		dummy_start,
2604 	.stop =			dummy_stop,
2605 
2606 	.urb_enqueue =		dummy_urb_enqueue,
2607 	.urb_dequeue =		dummy_urb_dequeue,
2608 
2609 	.get_frame_number =	dummy_h_get_frame,
2610 
2611 	.hub_status_data =	dummy_hub_status,
2612 	.hub_control =		dummy_hub_control,
2613 	.bus_suspend =		dummy_bus_suspend,
2614 	.bus_resume =		dummy_bus_resume,
2615 
2616 	.alloc_streams =	dummy_alloc_streams,
2617 	.free_streams =		dummy_free_streams,
2618 };
2619 
2620 static int dummy_hcd_probe(struct platform_device *pdev)
2621 {
2622 	struct dummy		*dum;
2623 	struct usb_hcd		*hs_hcd;
2624 	struct usb_hcd		*ss_hcd;
2625 	int			retval;
2626 
2627 	dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2628 	dum = *((void **)dev_get_platdata(&pdev->dev));
2629 
2630 	if (mod_data.is_super_speed)
2631 		dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2632 	else if (mod_data.is_high_speed)
2633 		dummy_hcd.flags = HCD_USB2;
2634 	else
2635 		dummy_hcd.flags = HCD_USB11;
2636 	hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2637 	if (!hs_hcd)
2638 		return -ENOMEM;
2639 	hs_hcd->has_tt = 1;
2640 
2641 	retval = usb_add_hcd(hs_hcd, 0, 0);
2642 	if (retval)
2643 		goto put_usb2_hcd;
2644 
2645 	if (mod_data.is_super_speed) {
2646 		ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2647 					dev_name(&pdev->dev), hs_hcd);
2648 		if (!ss_hcd) {
2649 			retval = -ENOMEM;
2650 			goto dealloc_usb2_hcd;
2651 		}
2652 
2653 		retval = usb_add_hcd(ss_hcd, 0, 0);
2654 		if (retval)
2655 			goto put_usb3_hcd;
2656 	}
2657 	return 0;
2658 
2659 put_usb3_hcd:
2660 	usb_put_hcd(ss_hcd);
2661 dealloc_usb2_hcd:
2662 	usb_remove_hcd(hs_hcd);
2663 put_usb2_hcd:
2664 	usb_put_hcd(hs_hcd);
2665 	dum->hs_hcd = dum->ss_hcd = NULL;
2666 	return retval;
2667 }
2668 
2669 static int dummy_hcd_remove(struct platform_device *pdev)
2670 {
2671 	struct dummy		*dum;
2672 
2673 	dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2674 
2675 	if (dum->ss_hcd) {
2676 		usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2677 		usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2678 	}
2679 
2680 	usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2681 	usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2682 
2683 	dum->hs_hcd = NULL;
2684 	dum->ss_hcd = NULL;
2685 
2686 	return 0;
2687 }
2688 
2689 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2690 {
2691 	struct usb_hcd		*hcd;
2692 	struct dummy_hcd	*dum_hcd;
2693 	int			rc = 0;
2694 
2695 	dev_dbg(&pdev->dev, "%s\n", __func__);
2696 
2697 	hcd = platform_get_drvdata(pdev);
2698 	dum_hcd = hcd_to_dummy_hcd(hcd);
2699 	if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2700 		dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2701 		rc = -EBUSY;
2702 	} else
2703 		clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2704 	return rc;
2705 }
2706 
2707 static int dummy_hcd_resume(struct platform_device *pdev)
2708 {
2709 	struct usb_hcd		*hcd;
2710 
2711 	dev_dbg(&pdev->dev, "%s\n", __func__);
2712 
2713 	hcd = platform_get_drvdata(pdev);
2714 	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2715 	usb_hcd_poll_rh_status(hcd);
2716 	return 0;
2717 }
2718 
2719 static struct platform_driver dummy_hcd_driver = {
2720 	.probe		= dummy_hcd_probe,
2721 	.remove		= dummy_hcd_remove,
2722 	.suspend	= dummy_hcd_suspend,
2723 	.resume		= dummy_hcd_resume,
2724 	.driver		= {
2725 		.name	= (char *) driver_name,
2726 	},
2727 };
2728 
2729 /*-------------------------------------------------------------------------*/
2730 #define MAX_NUM_UDC	2
2731 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2732 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2733 
2734 static int __init init(void)
2735 {
2736 	int	retval = -ENOMEM;
2737 	int	i;
2738 	struct	dummy *dum[MAX_NUM_UDC];
2739 
2740 	if (usb_disabled())
2741 		return -ENODEV;
2742 
2743 	if (!mod_data.is_high_speed && mod_data.is_super_speed)
2744 		return -EINVAL;
2745 
2746 	if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2747 		pr_err("Number of emulated UDC must be in range of 1...%d\n",
2748 				MAX_NUM_UDC);
2749 		return -EINVAL;
2750 	}
2751 
2752 	for (i = 0; i < mod_data.num; i++) {
2753 		the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2754 		if (!the_hcd_pdev[i]) {
2755 			i--;
2756 			while (i >= 0)
2757 				platform_device_put(the_hcd_pdev[i--]);
2758 			return retval;
2759 		}
2760 	}
2761 	for (i = 0; i < mod_data.num; i++) {
2762 		the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2763 		if (!the_udc_pdev[i]) {
2764 			i--;
2765 			while (i >= 0)
2766 				platform_device_put(the_udc_pdev[i--]);
2767 			goto err_alloc_udc;
2768 		}
2769 	}
2770 	for (i = 0; i < mod_data.num; i++) {
2771 		dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2772 		if (!dum[i]) {
2773 			retval = -ENOMEM;
2774 			goto err_add_pdata;
2775 		}
2776 		retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2777 				sizeof(void *));
2778 		if (retval)
2779 			goto err_add_pdata;
2780 		retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2781 				sizeof(void *));
2782 		if (retval)
2783 			goto err_add_pdata;
2784 	}
2785 
2786 	retval = platform_driver_register(&dummy_hcd_driver);
2787 	if (retval < 0)
2788 		goto err_add_pdata;
2789 	retval = platform_driver_register(&dummy_udc_driver);
2790 	if (retval < 0)
2791 		goto err_register_udc_driver;
2792 
2793 	for (i = 0; i < mod_data.num; i++) {
2794 		retval = platform_device_add(the_hcd_pdev[i]);
2795 		if (retval < 0) {
2796 			i--;
2797 			while (i >= 0)
2798 				platform_device_del(the_hcd_pdev[i--]);
2799 			goto err_add_hcd;
2800 		}
2801 	}
2802 	for (i = 0; i < mod_data.num; i++) {
2803 		if (!dum[i]->hs_hcd ||
2804 				(!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2805 			/*
2806 			 * The hcd was added successfully but its probe
2807 			 * function failed for some reason.
2808 			 */
2809 			retval = -EINVAL;
2810 			goto err_add_udc;
2811 		}
2812 	}
2813 
2814 	for (i = 0; i < mod_data.num; i++) {
2815 		retval = platform_device_add(the_udc_pdev[i]);
2816 		if (retval < 0) {
2817 			i--;
2818 			while (i >= 0)
2819 				platform_device_del(the_udc_pdev[i--]);
2820 			goto err_add_udc;
2821 		}
2822 	}
2823 
2824 	for (i = 0; i < mod_data.num; i++) {
2825 		if (!platform_get_drvdata(the_udc_pdev[i])) {
2826 			/*
2827 			 * The udc was added successfully but its probe
2828 			 * function failed for some reason.
2829 			 */
2830 			retval = -EINVAL;
2831 			goto err_probe_udc;
2832 		}
2833 	}
2834 	return retval;
2835 
2836 err_probe_udc:
2837 	for (i = 0; i < mod_data.num; i++)
2838 		platform_device_del(the_udc_pdev[i]);
2839 err_add_udc:
2840 	for (i = 0; i < mod_data.num; i++)
2841 		platform_device_del(the_hcd_pdev[i]);
2842 err_add_hcd:
2843 	platform_driver_unregister(&dummy_udc_driver);
2844 err_register_udc_driver:
2845 	platform_driver_unregister(&dummy_hcd_driver);
2846 err_add_pdata:
2847 	for (i = 0; i < mod_data.num; i++)
2848 		kfree(dum[i]);
2849 	for (i = 0; i < mod_data.num; i++)
2850 		platform_device_put(the_udc_pdev[i]);
2851 err_alloc_udc:
2852 	for (i = 0; i < mod_data.num; i++)
2853 		platform_device_put(the_hcd_pdev[i]);
2854 	return retval;
2855 }
2856 module_init(init);
2857 
2858 static void __exit cleanup(void)
2859 {
2860 	int i;
2861 
2862 	for (i = 0; i < mod_data.num; i++) {
2863 		struct dummy *dum;
2864 
2865 		dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2866 
2867 		platform_device_unregister(the_udc_pdev[i]);
2868 		platform_device_unregister(the_hcd_pdev[i]);
2869 		kfree(dum);
2870 	}
2871 	platform_driver_unregister(&dummy_udc_driver);
2872 	platform_driver_unregister(&dummy_hcd_driver);
2873 }
2874 module_exit(cleanup);
2875