Merge tag 'fixes-for-v3.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi...
[~shefty/rdma-dev.git] / drivers / usb / gadget / dummy_hcd.c
1 /*
2  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
3  *
4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
5  *
6  * Copyright (C) 2003 David Brownell
7  * Copyright (C) 2003-2005 Alan Stern
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  */
14
15
16 /*
17  * This exposes a device side "USB gadget" API, driven by requests to a
18  * Linux-USB host controller driver.  USB traffic is simulated; there's
19  * no need for USB hardware.  Use this with two other drivers:
20  *
21  *  - Gadget driver, responding to requests (slave);
22  *  - Host-side device driver, as already familiar in Linux.
23  *
24  * Having this all in one kernel can help some stages of development,
25  * bypassing some hardware (and driver) issues.  UML could help too.
26  */
27
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/timer.h>
36 #include <linux/list.h>
37 #include <linux/interrupt.h>
38 #include <linux/platform_device.h>
39 #include <linux/usb.h>
40 #include <linux/usb/gadget.h>
41 #include <linux/usb/hcd.h>
42 #include <linux/scatterlist.h>
43
44 #include <asm/byteorder.h>
45 #include <linux/io.h>
46 #include <asm/irq.h>
47 #include <asm/unaligned.h>
48
49 #define DRIVER_DESC     "USB Host+Gadget Emulator"
50 #define DRIVER_VERSION  "02 May 2005"
51
52 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
53
54 static const char       driver_name[] = "dummy_hcd";
55 static const char       driver_desc[] = "USB Host+Gadget Emulator";
56
57 static const char       gadget_name[] = "dummy_udc";
58
59 MODULE_DESCRIPTION(DRIVER_DESC);
60 MODULE_AUTHOR("David Brownell");
61 MODULE_LICENSE("GPL");
62
63 struct dummy_hcd_module_parameters {
64         bool is_super_speed;
65         bool is_high_speed;
66         unsigned int num;
67 };
68
69 static struct dummy_hcd_module_parameters mod_data = {
70         .is_super_speed = false,
71         .is_high_speed = true,
72         .num = 1,
73 };
74 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
75 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
76 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
77 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
78 module_param_named(num, mod_data.num, uint, S_IRUGO);
79 MODULE_PARM_DESC(num, "number of emulated controllers");
80 /*-------------------------------------------------------------------------*/
81
82 /* gadget side driver data structres */
83 struct dummy_ep {
84         struct list_head                queue;
85         unsigned long                   last_io;        /* jiffies timestamp */
86         struct usb_gadget               *gadget;
87         const struct usb_endpoint_descriptor *desc;
88         struct usb_ep                   ep;
89         unsigned                        halted:1;
90         unsigned                        wedged:1;
91         unsigned                        already_seen:1;
92         unsigned                        setup_stage:1;
93         unsigned                        stream_en:1;
94 };
95
96 struct dummy_request {
97         struct list_head                queue;          /* ep's requests */
98         struct usb_request              req;
99 };
100
101 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
102 {
103         return container_of(_ep, struct dummy_ep, ep);
104 }
105
106 static inline struct dummy_request *usb_request_to_dummy_request
107                 (struct usb_request *_req)
108 {
109         return container_of(_req, struct dummy_request, req);
110 }
111
112 /*-------------------------------------------------------------------------*/
113
114 /*
115  * Every device has ep0 for control requests, plus up to 30 more endpoints,
116  * in one of two types:
117  *
118  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
119  *     number can be changed.  Names like "ep-a" are used for this type.
120  *
121  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
122  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
123  *
124  * Gadget drivers are responsible for not setting up conflicting endpoint
125  * configurations, illegal or unsupported packet lengths, and so on.
126  */
127
128 static const char ep0name[] = "ep0";
129
130 static const char *const ep_name[] = {
131         ep0name,                                /* everyone has ep0 */
132
133         /* act like a pxa250: fifteen fixed function endpoints */
134         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
135         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
136         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
137                 "ep15in-int",
138
139         /* or like sa1100: two fixed function endpoints */
140         "ep1out-bulk", "ep2in-bulk",
141
142         /* and now some generic EPs so we have enough in multi config */
143         "ep3out", "ep4in", "ep5out", "ep6out", "ep7in", "ep8out", "ep9in",
144         "ep10out", "ep11out", "ep12in", "ep13out", "ep14in", "ep15out",
145 };
146 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
147
148 /*-------------------------------------------------------------------------*/
149
150 #define FIFO_SIZE               64
151
152 struct urbp {
153         struct urb              *urb;
154         struct list_head        urbp_list;
155         struct sg_mapping_iter  miter;
156         u32                     miter_started;
157 };
158
159
160 enum dummy_rh_state {
161         DUMMY_RH_RESET,
162         DUMMY_RH_SUSPENDED,
163         DUMMY_RH_RUNNING
164 };
165
166 struct dummy_hcd {
167         struct dummy                    *dum;
168         enum dummy_rh_state             rh_state;
169         struct timer_list               timer;
170         u32                             port_status;
171         u32                             old_status;
172         unsigned long                   re_timeout;
173
174         struct usb_device               *udev;
175         struct list_head                urbp_list;
176         u32                             stream_en_ep;
177         u8                              num_stream[30 / 2];
178
179         unsigned                        active:1;
180         unsigned                        old_active:1;
181         unsigned                        resuming:1;
182 };
183
184 struct dummy {
185         spinlock_t                      lock;
186
187         /*
188          * SLAVE/GADGET side support
189          */
190         struct dummy_ep                 ep[DUMMY_ENDPOINTS];
191         int                             address;
192         struct usb_gadget               gadget;
193         struct usb_gadget_driver        *driver;
194         struct dummy_request            fifo_req;
195         u8                              fifo_buf[FIFO_SIZE];
196         u16                             devstatus;
197         unsigned                        udc_suspended:1;
198         unsigned                        pullup:1;
199
200         /*
201          * MASTER/HOST side support
202          */
203         struct dummy_hcd                *hs_hcd;
204         struct dummy_hcd                *ss_hcd;
205 };
206
207 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
208 {
209         return (struct dummy_hcd *) (hcd->hcd_priv);
210 }
211
212 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
213 {
214         return container_of((void *) dum, struct usb_hcd, hcd_priv);
215 }
216
217 static inline struct device *dummy_dev(struct dummy_hcd *dum)
218 {
219         return dummy_hcd_to_hcd(dum)->self.controller;
220 }
221
222 static inline struct device *udc_dev(struct dummy *dum)
223 {
224         return dum->gadget.dev.parent;
225 }
226
227 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
228 {
229         return container_of(ep->gadget, struct dummy, gadget);
230 }
231
232 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
233 {
234         struct dummy *dum = container_of(gadget, struct dummy, gadget);
235         if (dum->gadget.speed == USB_SPEED_SUPER)
236                 return dum->ss_hcd;
237         else
238                 return dum->hs_hcd;
239 }
240
241 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
242 {
243         return container_of(dev, struct dummy, gadget.dev);
244 }
245
246 /*-------------------------------------------------------------------------*/
247
248 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
249
250 /* called with spinlock held */
251 static void nuke(struct dummy *dum, struct dummy_ep *ep)
252 {
253         while (!list_empty(&ep->queue)) {
254                 struct dummy_request    *req;
255
256                 req = list_entry(ep->queue.next, struct dummy_request, queue);
257                 list_del_init(&req->queue);
258                 req->req.status = -ESHUTDOWN;
259
260                 spin_unlock(&dum->lock);
261                 req->req.complete(&ep->ep, &req->req);
262                 spin_lock(&dum->lock);
263         }
264 }
265
266 /* caller must hold lock */
267 static void stop_activity(struct dummy *dum)
268 {
269         struct dummy_ep *ep;
270
271         /* prevent any more requests */
272         dum->address = 0;
273
274         /* The timer is left running so that outstanding URBs can fail */
275
276         /* nuke any pending requests first, so driver i/o is quiesced */
277         list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list)
278                 nuke(dum, ep);
279
280         /* driver now does any non-usb quiescing necessary */
281 }
282
283 /**
284  * set_link_state_by_speed() - Sets the current state of the link according to
285  *      the hcd speed
286  * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
287  *
288  * This function updates the port_status according to the link state and the
289  * speed of the hcd.
290  */
291 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
292 {
293         struct dummy *dum = dum_hcd->dum;
294
295         if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
296                 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
297                         dum_hcd->port_status = 0;
298                 } else if (!dum->pullup || dum->udc_suspended) {
299                         /* UDC suspend must cause a disconnect */
300                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
301                                                 USB_PORT_STAT_ENABLE);
302                         if ((dum_hcd->old_status &
303                              USB_PORT_STAT_CONNECTION) != 0)
304                                 dum_hcd->port_status |=
305                                         (USB_PORT_STAT_C_CONNECTION << 16);
306                 } else {
307                         /* device is connected and not suspended */
308                         dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
309                                                  USB_PORT_STAT_SPEED_5GBPS) ;
310                         if ((dum_hcd->old_status &
311                              USB_PORT_STAT_CONNECTION) == 0)
312                                 dum_hcd->port_status |=
313                                         (USB_PORT_STAT_C_CONNECTION << 16);
314                         if ((dum_hcd->port_status &
315                              USB_PORT_STAT_ENABLE) == 1 &&
316                                 (dum_hcd->port_status &
317                                  USB_SS_PORT_LS_U0) == 1 &&
318                                 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
319                                 dum_hcd->active = 1;
320                 }
321         } else {
322                 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
323                         dum_hcd->port_status = 0;
324                 } else if (!dum->pullup || dum->udc_suspended) {
325                         /* UDC suspend must cause a disconnect */
326                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
327                                                 USB_PORT_STAT_ENABLE |
328                                                 USB_PORT_STAT_LOW_SPEED |
329                                                 USB_PORT_STAT_HIGH_SPEED |
330                                                 USB_PORT_STAT_SUSPEND);
331                         if ((dum_hcd->old_status &
332                              USB_PORT_STAT_CONNECTION) != 0)
333                                 dum_hcd->port_status |=
334                                         (USB_PORT_STAT_C_CONNECTION << 16);
335                 } else {
336                         dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
337                         if ((dum_hcd->old_status &
338                              USB_PORT_STAT_CONNECTION) == 0)
339                                 dum_hcd->port_status |=
340                                         (USB_PORT_STAT_C_CONNECTION << 16);
341                         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
342                                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
343                         else if ((dum_hcd->port_status &
344                                   USB_PORT_STAT_SUSPEND) == 0 &&
345                                         dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
346                                 dum_hcd->active = 1;
347                 }
348         }
349 }
350
351 /* caller must hold lock */
352 static void set_link_state(struct dummy_hcd *dum_hcd)
353 {
354         struct dummy *dum = dum_hcd->dum;
355
356         dum_hcd->active = 0;
357         if (dum->pullup)
358                 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
359                      dum->gadget.speed != USB_SPEED_SUPER) ||
360                     (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
361                      dum->gadget.speed == USB_SPEED_SUPER))
362                         return;
363
364         set_link_state_by_speed(dum_hcd);
365
366         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
367              dum_hcd->active)
368                 dum_hcd->resuming = 0;
369
370         /* if !connected or reset */
371         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
372                         (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
373                 /*
374                  * We're connected and not reset (reset occurred now),
375                  * and driver attached - disconnect!
376                  */
377                 if ((dum_hcd->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
378                     (dum_hcd->old_status & USB_PORT_STAT_RESET) == 0 &&
379                     dum->driver) {
380                         stop_activity(dum);
381                         spin_unlock(&dum->lock);
382                         dum->driver->disconnect(&dum->gadget);
383                         spin_lock(&dum->lock);
384                 }
385         } else if (dum_hcd->active != dum_hcd->old_active) {
386                 if (dum_hcd->old_active && dum->driver->suspend) {
387                         spin_unlock(&dum->lock);
388                         dum->driver->suspend(&dum->gadget);
389                         spin_lock(&dum->lock);
390                 } else if (!dum_hcd->old_active &&  dum->driver->resume) {
391                         spin_unlock(&dum->lock);
392                         dum->driver->resume(&dum->gadget);
393                         spin_lock(&dum->lock);
394                 }
395         }
396
397         dum_hcd->old_status = dum_hcd->port_status;
398         dum_hcd->old_active = dum_hcd->active;
399 }
400
401 /*-------------------------------------------------------------------------*/
402
403 /* SLAVE/GADGET SIDE DRIVER
404  *
405  * This only tracks gadget state.  All the work is done when the host
406  * side tries some (emulated) i/o operation.  Real device controller
407  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
408  */
409
410 #define is_enabled(dum) \
411         (dum->port_status & USB_PORT_STAT_ENABLE)
412
413 static int dummy_enable(struct usb_ep *_ep,
414                 const struct usb_endpoint_descriptor *desc)
415 {
416         struct dummy            *dum;
417         struct dummy_hcd        *dum_hcd;
418         struct dummy_ep         *ep;
419         unsigned                max;
420         int                     retval;
421
422         ep = usb_ep_to_dummy_ep(_ep);
423         if (!_ep || !desc || ep->desc || _ep->name == ep0name
424                         || desc->bDescriptorType != USB_DT_ENDPOINT)
425                 return -EINVAL;
426         dum = ep_to_dummy(ep);
427         if (!dum->driver)
428                 return -ESHUTDOWN;
429
430         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
431         if (!is_enabled(dum_hcd))
432                 return -ESHUTDOWN;
433
434         /*
435          * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
436          * maximum packet size.
437          * For SS devices the wMaxPacketSize is limited by 1024.
438          */
439         max = usb_endpoint_maxp(desc) & 0x7ff;
440
441         /* drivers must not request bad settings, since lower levels
442          * (hardware or its drivers) may not check.  some endpoints
443          * can't do iso, many have maxpacket limitations, etc.
444          *
445          * since this "hardware" driver is here to help debugging, we
446          * have some extra sanity checks.  (there could be more though,
447          * especially for "ep9out" style fixed function ones.)
448          */
449         retval = -EINVAL;
450         switch (usb_endpoint_type(desc)) {
451         case USB_ENDPOINT_XFER_BULK:
452                 if (strstr(ep->ep.name, "-iso")
453                                 || strstr(ep->ep.name, "-int")) {
454                         goto done;
455                 }
456                 switch (dum->gadget.speed) {
457                 case USB_SPEED_SUPER:
458                         if (max == 1024)
459                                 break;
460                         goto done;
461                 case USB_SPEED_HIGH:
462                         if (max == 512)
463                                 break;
464                         goto done;
465                 case USB_SPEED_FULL:
466                         if (max == 8 || max == 16 || max == 32 || max == 64)
467                                 /* we'll fake any legal size */
468                                 break;
469                         /* save a return statement */
470                 default:
471                         goto done;
472                 }
473                 break;
474         case USB_ENDPOINT_XFER_INT:
475                 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
476                         goto done;
477                 /* real hardware might not handle all packet sizes */
478                 switch (dum->gadget.speed) {
479                 case USB_SPEED_SUPER:
480                 case USB_SPEED_HIGH:
481                         if (max <= 1024)
482                                 break;
483                         /* save a return statement */
484                 case USB_SPEED_FULL:
485                         if (max <= 64)
486                                 break;
487                         /* save a return statement */
488                 default:
489                         if (max <= 8)
490                                 break;
491                         goto done;
492                 }
493                 break;
494         case USB_ENDPOINT_XFER_ISOC:
495                 if (strstr(ep->ep.name, "-bulk")
496                                 || strstr(ep->ep.name, "-int"))
497                         goto done;
498                 /* real hardware might not handle all packet sizes */
499                 switch (dum->gadget.speed) {
500                 case USB_SPEED_SUPER:
501                 case USB_SPEED_HIGH:
502                         if (max <= 1024)
503                                 break;
504                         /* save a return statement */
505                 case USB_SPEED_FULL:
506                         if (max <= 1023)
507                                 break;
508                         /* save a return statement */
509                 default:
510                         goto done;
511                 }
512                 break;
513         default:
514                 /* few chips support control except on ep0 */
515                 goto done;
516         }
517
518         _ep->maxpacket = max;
519         if (usb_ss_max_streams(_ep->comp_desc)) {
520                 if (!usb_endpoint_xfer_bulk(desc)) {
521                         dev_err(udc_dev(dum), "Can't enable stream support on "
522                                         "non-bulk ep %s\n", _ep->name);
523                         return -EINVAL;
524                 }
525                 ep->stream_en = 1;
526         }
527         ep->desc = desc;
528
529         dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
530                 _ep->name,
531                 desc->bEndpointAddress & 0x0f,
532                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
533                 ({ char *val;
534                  switch (usb_endpoint_type(desc)) {
535                  case USB_ENDPOINT_XFER_BULK:
536                          val = "bulk";
537                          break;
538                  case USB_ENDPOINT_XFER_ISOC:
539                          val = "iso";
540                          break;
541                  case USB_ENDPOINT_XFER_INT:
542                          val = "intr";
543                          break;
544                  default:
545                          val = "ctrl";
546                          break;
547                  }; val; }),
548                 max, ep->stream_en ? "enabled" : "disabled");
549
550         /* at this point real hardware should be NAKing transfers
551          * to that endpoint, until a buffer is queued to it.
552          */
553         ep->halted = ep->wedged = 0;
554         retval = 0;
555 done:
556         return retval;
557 }
558
559 static int dummy_disable(struct usb_ep *_ep)
560 {
561         struct dummy_ep         *ep;
562         struct dummy            *dum;
563         unsigned long           flags;
564         int                     retval;
565
566         ep = usb_ep_to_dummy_ep(_ep);
567         if (!_ep || !ep->desc || _ep->name == ep0name)
568                 return -EINVAL;
569         dum = ep_to_dummy(ep);
570
571         spin_lock_irqsave(&dum->lock, flags);
572         ep->desc = NULL;
573         ep->stream_en = 0;
574         retval = 0;
575         nuke(dum, ep);
576         spin_unlock_irqrestore(&dum->lock, flags);
577
578         dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
579         return retval;
580 }
581
582 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
583                 gfp_t mem_flags)
584 {
585         struct dummy_ep         *ep;
586         struct dummy_request    *req;
587
588         if (!_ep)
589                 return NULL;
590         ep = usb_ep_to_dummy_ep(_ep);
591
592         req = kzalloc(sizeof(*req), mem_flags);
593         if (!req)
594                 return NULL;
595         INIT_LIST_HEAD(&req->queue);
596         return &req->req;
597 }
598
599 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
600 {
601         struct dummy_request    *req;
602
603         if (!_ep || !_req) {
604                 WARN_ON(1);
605                 return;
606         }
607
608         req = usb_request_to_dummy_request(_req);
609         WARN_ON(!list_empty(&req->queue));
610         kfree(req);
611 }
612
613 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
614 {
615 }
616
617 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
618                 gfp_t mem_flags)
619 {
620         struct dummy_ep         *ep;
621         struct dummy_request    *req;
622         struct dummy            *dum;
623         struct dummy_hcd        *dum_hcd;
624         unsigned long           flags;
625
626         req = usb_request_to_dummy_request(_req);
627         if (!_req || !list_empty(&req->queue) || !_req->complete)
628                 return -EINVAL;
629
630         ep = usb_ep_to_dummy_ep(_ep);
631         if (!_ep || (!ep->desc && _ep->name != ep0name))
632                 return -EINVAL;
633
634         dum = ep_to_dummy(ep);
635         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
636         if (!dum->driver || !is_enabled(dum_hcd))
637                 return -ESHUTDOWN;
638
639 #if 0
640         dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
641                         ep, _req, _ep->name, _req->length, _req->buf);
642 #endif
643         _req->status = -EINPROGRESS;
644         _req->actual = 0;
645         spin_lock_irqsave(&dum->lock, flags);
646
647         /* implement an emulated single-request FIFO */
648         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
649                         list_empty(&dum->fifo_req.queue) &&
650                         list_empty(&ep->queue) &&
651                         _req->length <= FIFO_SIZE) {
652                 req = &dum->fifo_req;
653                 req->req = *_req;
654                 req->req.buf = dum->fifo_buf;
655                 memcpy(dum->fifo_buf, _req->buf, _req->length);
656                 req->req.context = dum;
657                 req->req.complete = fifo_complete;
658
659                 list_add_tail(&req->queue, &ep->queue);
660                 spin_unlock(&dum->lock);
661                 _req->actual = _req->length;
662                 _req->status = 0;
663                 _req->complete(_ep, _req);
664                 spin_lock(&dum->lock);
665         }  else
666                 list_add_tail(&req->queue, &ep->queue);
667         spin_unlock_irqrestore(&dum->lock, flags);
668
669         /* real hardware would likely enable transfers here, in case
670          * it'd been left NAKing.
671          */
672         return 0;
673 }
674
675 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
676 {
677         struct dummy_ep         *ep;
678         struct dummy            *dum;
679         int                     retval = -EINVAL;
680         unsigned long           flags;
681         struct dummy_request    *req = NULL;
682
683         if (!_ep || !_req)
684                 return retval;
685         ep = usb_ep_to_dummy_ep(_ep);
686         dum = ep_to_dummy(ep);
687
688         if (!dum->driver)
689                 return -ESHUTDOWN;
690
691         local_irq_save(flags);
692         spin_lock(&dum->lock);
693         list_for_each_entry(req, &ep->queue, queue) {
694                 if (&req->req == _req) {
695                         list_del_init(&req->queue);
696                         _req->status = -ECONNRESET;
697                         retval = 0;
698                         break;
699                 }
700         }
701         spin_unlock(&dum->lock);
702
703         if (retval == 0) {
704                 dev_dbg(udc_dev(dum),
705                                 "dequeued req %p from %s, len %d buf %p\n",
706                                 req, _ep->name, _req->length, _req->buf);
707                 _req->complete(_ep, _req);
708         }
709         local_irq_restore(flags);
710         return retval;
711 }
712
713 static int
714 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
715 {
716         struct dummy_ep         *ep;
717         struct dummy            *dum;
718
719         if (!_ep)
720                 return -EINVAL;
721         ep = usb_ep_to_dummy_ep(_ep);
722         dum = ep_to_dummy(ep);
723         if (!dum->driver)
724                 return -ESHUTDOWN;
725         if (!value)
726                 ep->halted = ep->wedged = 0;
727         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
728                         !list_empty(&ep->queue))
729                 return -EAGAIN;
730         else {
731                 ep->halted = 1;
732                 if (wedged)
733                         ep->wedged = 1;
734         }
735         /* FIXME clear emulated data toggle too */
736         return 0;
737 }
738
739 static int
740 dummy_set_halt(struct usb_ep *_ep, int value)
741 {
742         return dummy_set_halt_and_wedge(_ep, value, 0);
743 }
744
745 static int dummy_set_wedge(struct usb_ep *_ep)
746 {
747         if (!_ep || _ep->name == ep0name)
748                 return -EINVAL;
749         return dummy_set_halt_and_wedge(_ep, 1, 1);
750 }
751
752 static const struct usb_ep_ops dummy_ep_ops = {
753         .enable         = dummy_enable,
754         .disable        = dummy_disable,
755
756         .alloc_request  = dummy_alloc_request,
757         .free_request   = dummy_free_request,
758
759         .queue          = dummy_queue,
760         .dequeue        = dummy_dequeue,
761
762         .set_halt       = dummy_set_halt,
763         .set_wedge      = dummy_set_wedge,
764 };
765
766 /*-------------------------------------------------------------------------*/
767
768 /* there are both host and device side versions of this call ... */
769 static int dummy_g_get_frame(struct usb_gadget *_gadget)
770 {
771         struct timeval  tv;
772
773         do_gettimeofday(&tv);
774         return tv.tv_usec / 1000;
775 }
776
777 static int dummy_wakeup(struct usb_gadget *_gadget)
778 {
779         struct dummy_hcd *dum_hcd;
780
781         dum_hcd = gadget_to_dummy_hcd(_gadget);
782         if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
783                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
784                 return -EINVAL;
785         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
786                 return -ENOLINK;
787         if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
788                          dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
789                 return -EIO;
790
791         /* FIXME: What if the root hub is suspended but the port isn't? */
792
793         /* hub notices our request, issues downstream resume, etc */
794         dum_hcd->resuming = 1;
795         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
796         mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
797         return 0;
798 }
799
800 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
801 {
802         struct dummy    *dum;
803
804         dum = gadget_to_dummy_hcd(_gadget)->dum;
805         if (value)
806                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
807         else
808                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
809         return 0;
810 }
811
812 static void dummy_udc_update_ep0(struct dummy *dum)
813 {
814         if (dum->gadget.speed == USB_SPEED_SUPER)
815                 dum->ep[0].ep.maxpacket = 9;
816         else
817                 dum->ep[0].ep.maxpacket = 64;
818 }
819
820 static int dummy_pullup(struct usb_gadget *_gadget, int value)
821 {
822         struct dummy_hcd *dum_hcd;
823         struct dummy    *dum;
824         unsigned long   flags;
825
826         dum = gadget_dev_to_dummy(&_gadget->dev);
827
828         if (value && dum->driver) {
829                 if (mod_data.is_super_speed)
830                         dum->gadget.speed = dum->driver->max_speed;
831                 else if (mod_data.is_high_speed)
832                         dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
833                                         dum->driver->max_speed);
834                 else
835                         dum->gadget.speed = USB_SPEED_FULL;
836                 dummy_udc_update_ep0(dum);
837
838                 if (dum->gadget.speed < dum->driver->max_speed)
839                         dev_dbg(udc_dev(dum), "This device can perform faster"
840                                 " if you connect it to a %s port...\n",
841                                 usb_speed_string(dum->driver->max_speed));
842         }
843         dum_hcd = gadget_to_dummy_hcd(_gadget);
844
845         spin_lock_irqsave(&dum->lock, flags);
846         dum->pullup = (value != 0);
847         set_link_state(dum_hcd);
848         spin_unlock_irqrestore(&dum->lock, flags);
849
850         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
851         return 0;
852 }
853
854 static int dummy_udc_start(struct usb_gadget *g,
855                 struct usb_gadget_driver *driver);
856 static int dummy_udc_stop(struct usb_gadget *g,
857                 struct usb_gadget_driver *driver);
858
859 static const struct usb_gadget_ops dummy_ops = {
860         .get_frame      = dummy_g_get_frame,
861         .wakeup         = dummy_wakeup,
862         .set_selfpowered = dummy_set_selfpowered,
863         .pullup         = dummy_pullup,
864         .udc_start      = dummy_udc_start,
865         .udc_stop       = dummy_udc_stop,
866 };
867
868 /*-------------------------------------------------------------------------*/
869
870 /* "function" sysfs attribute */
871 static ssize_t show_function(struct device *dev, struct device_attribute *attr,
872                 char *buf)
873 {
874         struct dummy    *dum = gadget_dev_to_dummy(dev);
875
876         if (!dum->driver || !dum->driver->function)
877                 return 0;
878         return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
879 }
880 static DEVICE_ATTR(function, S_IRUGO, show_function, NULL);
881
882 /*-------------------------------------------------------------------------*/
883
884 /*
885  * Driver registration/unregistration.
886  *
887  * This is basically hardware-specific; there's usually only one real USB
888  * device (not host) controller since that's how USB devices are intended
889  * to work.  So most implementations of these api calls will rely on the
890  * fact that only one driver will ever bind to the hardware.  But curious
891  * hardware can be built with discrete components, so the gadget API doesn't
892  * require that assumption.
893  *
894  * For this emulator, it might be convenient to create a usb slave device
895  * for each driver that registers:  just add to a big root hub.
896  */
897
898 static int dummy_udc_start(struct usb_gadget *g,
899                 struct usb_gadget_driver *driver)
900 {
901         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
902         struct dummy            *dum = dum_hcd->dum;
903
904         if (driver->max_speed == USB_SPEED_UNKNOWN)
905                 return -EINVAL;
906
907         /*
908          * SLAVE side init ... the layer above hardware, which
909          * can't enumerate without help from the driver we're binding.
910          */
911
912         dum->devstatus = 0;
913
914         dum->driver = driver;
915         dum->gadget.dev.driver = &driver->driver;
916         dev_dbg(udc_dev(dum), "binding gadget driver '%s'\n",
917                         driver->driver.name);
918         return 0;
919 }
920
921 static int dummy_udc_stop(struct usb_gadget *g,
922                 struct usb_gadget_driver *driver)
923 {
924         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
925         struct dummy            *dum = dum_hcd->dum;
926
927         dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n",
928                         driver->driver.name);
929
930         dum->gadget.dev.driver = NULL;
931         dum->driver = NULL;
932
933         return 0;
934 }
935
936 #undef is_enabled
937
938 /* The gadget structure is stored inside the hcd structure and will be
939  * released along with it. */
940 static void dummy_gadget_release(struct device *dev)
941 {
942         return;
943 }
944
945 static void init_dummy_udc_hw(struct dummy *dum)
946 {
947         int i;
948
949         INIT_LIST_HEAD(&dum->gadget.ep_list);
950         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
951                 struct dummy_ep *ep = &dum->ep[i];
952
953                 if (!ep_name[i])
954                         break;
955                 ep->ep.name = ep_name[i];
956                 ep->ep.ops = &dummy_ep_ops;
957                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
958                 ep->halted = ep->wedged = ep->already_seen =
959                                 ep->setup_stage = 0;
960                 ep->ep.maxpacket = ~0;
961                 ep->ep.max_streams = 16;
962                 ep->last_io = jiffies;
963                 ep->gadget = &dum->gadget;
964                 ep->desc = NULL;
965                 INIT_LIST_HEAD(&ep->queue);
966         }
967
968         dum->gadget.ep0 = &dum->ep[0].ep;
969         list_del_init(&dum->ep[0].ep.ep_list);
970         INIT_LIST_HEAD(&dum->fifo_req.queue);
971
972 #ifdef CONFIG_USB_OTG
973         dum->gadget.is_otg = 1;
974 #endif
975 }
976
977 static int dummy_udc_probe(struct platform_device *pdev)
978 {
979         struct dummy    *dum;
980         int             rc;
981
982         dum = *((void **)dev_get_platdata(&pdev->dev));
983         dum->gadget.name = gadget_name;
984         dum->gadget.ops = &dummy_ops;
985         dum->gadget.max_speed = USB_SPEED_SUPER;
986
987         dev_set_name(&dum->gadget.dev, "gadget");
988         dum->gadget.dev.parent = &pdev->dev;
989         dum->gadget.dev.release = dummy_gadget_release;
990         rc = device_register(&dum->gadget.dev);
991         if (rc < 0) {
992                 put_device(&dum->gadget.dev);
993                 return rc;
994         }
995
996         init_dummy_udc_hw(dum);
997
998         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
999         if (rc < 0)
1000                 goto err_udc;
1001
1002         rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1003         if (rc < 0)
1004                 goto err_dev;
1005         platform_set_drvdata(pdev, dum);
1006         return rc;
1007
1008 err_dev:
1009         usb_del_gadget_udc(&dum->gadget);
1010 err_udc:
1011         device_unregister(&dum->gadget.dev);
1012         return rc;
1013 }
1014
1015 static int dummy_udc_remove(struct platform_device *pdev)
1016 {
1017         struct dummy    *dum = platform_get_drvdata(pdev);
1018
1019         usb_del_gadget_udc(&dum->gadget);
1020         platform_set_drvdata(pdev, NULL);
1021         device_remove_file(&dum->gadget.dev, &dev_attr_function);
1022         device_unregister(&dum->gadget.dev);
1023         return 0;
1024 }
1025
1026 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1027                 int suspend)
1028 {
1029         spin_lock_irq(&dum->lock);
1030         dum->udc_suspended = suspend;
1031         set_link_state(dum_hcd);
1032         spin_unlock_irq(&dum->lock);
1033 }
1034
1035 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1036 {
1037         struct dummy            *dum = platform_get_drvdata(pdev);
1038         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1039
1040         dev_dbg(&pdev->dev, "%s\n", __func__);
1041         dummy_udc_pm(dum, dum_hcd, 1);
1042         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1043         return 0;
1044 }
1045
1046 static int dummy_udc_resume(struct platform_device *pdev)
1047 {
1048         struct dummy            *dum = platform_get_drvdata(pdev);
1049         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1050
1051         dev_dbg(&pdev->dev, "%s\n", __func__);
1052         dummy_udc_pm(dum, dum_hcd, 0);
1053         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1054         return 0;
1055 }
1056
1057 static struct platform_driver dummy_udc_driver = {
1058         .probe          = dummy_udc_probe,
1059         .remove         = dummy_udc_remove,
1060         .suspend        = dummy_udc_suspend,
1061         .resume         = dummy_udc_resume,
1062         .driver         = {
1063                 .name   = (char *) gadget_name,
1064                 .owner  = THIS_MODULE,
1065         },
1066 };
1067
1068 /*-------------------------------------------------------------------------*/
1069
1070 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1071 {
1072         unsigned int index;
1073
1074         index = usb_endpoint_num(desc) << 1;
1075         if (usb_endpoint_dir_in(desc))
1076                 index |= 1;
1077         return index;
1078 }
1079
1080 /* MASTER/HOST SIDE DRIVER
1081  *
1082  * this uses the hcd framework to hook up to host side drivers.
1083  * its root hub will only have one device, otherwise it acts like
1084  * a normal host controller.
1085  *
1086  * when urbs are queued, they're just stuck on a list that we
1087  * scan in a timer callback.  that callback connects writes from
1088  * the host with reads from the device, and so on, based on the
1089  * usb 2.0 rules.
1090  */
1091
1092 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1093 {
1094         const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1095         u32 index;
1096
1097         if (!usb_endpoint_xfer_bulk(desc))
1098                 return 0;
1099
1100         index = dummy_get_ep_idx(desc);
1101         return (1 << index) & dum_hcd->stream_en_ep;
1102 }
1103
1104 /*
1105  * The max stream number is saved as a nibble so for the 30 possible endpoints
1106  * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1107  * means we use only 1 stream). The maximum according to the spec is 16bit so
1108  * if the 16 stream limit is about to go, the array size should be incremented
1109  * to 30 elements of type u16.
1110  */
1111 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1112                 unsigned int pipe)
1113 {
1114         int max_streams;
1115
1116         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1117         if (usb_pipeout(pipe))
1118                 max_streams >>= 4;
1119         else
1120                 max_streams &= 0xf;
1121         max_streams++;
1122         return max_streams;
1123 }
1124
1125 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1126                 unsigned int pipe, unsigned int streams)
1127 {
1128         int max_streams;
1129
1130         streams--;
1131         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1132         if (usb_pipeout(pipe)) {
1133                 streams <<= 4;
1134                 max_streams &= 0xf;
1135         } else {
1136                 max_streams &= 0xf0;
1137         }
1138         max_streams |= streams;
1139         dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1140 }
1141
1142 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1143 {
1144         unsigned int max_streams;
1145         int enabled;
1146
1147         enabled = dummy_ep_stream_en(dum_hcd, urb);
1148         if (!urb->stream_id) {
1149                 if (enabled)
1150                         return -EINVAL;
1151                 return 0;
1152         }
1153         if (!enabled)
1154                 return -EINVAL;
1155
1156         max_streams = get_max_streams_for_pipe(dum_hcd,
1157                         usb_pipeendpoint(urb->pipe));
1158         if (urb->stream_id > max_streams) {
1159                 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1160                                 urb->stream_id);
1161                 BUG();
1162                 return -EINVAL;
1163         }
1164         return 0;
1165 }
1166
1167 static int dummy_urb_enqueue(
1168         struct usb_hcd                  *hcd,
1169         struct urb                      *urb,
1170         gfp_t                           mem_flags
1171 ) {
1172         struct dummy_hcd *dum_hcd;
1173         struct urbp     *urbp;
1174         unsigned long   flags;
1175         int             rc;
1176
1177         urbp = kmalloc(sizeof *urbp, mem_flags);
1178         if (!urbp)
1179                 return -ENOMEM;
1180         urbp->urb = urb;
1181         urbp->miter_started = 0;
1182
1183         dum_hcd = hcd_to_dummy_hcd(hcd);
1184         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1185
1186         rc = dummy_validate_stream(dum_hcd, urb);
1187         if (rc) {
1188                 kfree(urbp);
1189                 goto done;
1190         }
1191
1192         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1193         if (rc) {
1194                 kfree(urbp);
1195                 goto done;
1196         }
1197
1198         if (!dum_hcd->udev) {
1199                 dum_hcd->udev = urb->dev;
1200                 usb_get_dev(dum_hcd->udev);
1201         } else if (unlikely(dum_hcd->udev != urb->dev))
1202                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1203
1204         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1205         urb->hcpriv = urbp;
1206         if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1207                 urb->error_count = 1;           /* mark as a new urb */
1208
1209         /* kick the scheduler, it'll do the rest */
1210         if (!timer_pending(&dum_hcd->timer))
1211                 mod_timer(&dum_hcd->timer, jiffies + 1);
1212
1213  done:
1214         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1215         return rc;
1216 }
1217
1218 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1219 {
1220         struct dummy_hcd *dum_hcd;
1221         unsigned long   flags;
1222         int             rc;
1223
1224         /* giveback happens automatically in timer callback,
1225          * so make sure the callback happens */
1226         dum_hcd = hcd_to_dummy_hcd(hcd);
1227         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1228
1229         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1230         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1231                         !list_empty(&dum_hcd->urbp_list))
1232                 mod_timer(&dum_hcd->timer, jiffies);
1233
1234         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1235         return rc;
1236 }
1237
1238 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1239                 u32 len)
1240 {
1241         void *ubuf, *rbuf;
1242         struct urbp *urbp = urb->hcpriv;
1243         int to_host;
1244         struct sg_mapping_iter *miter = &urbp->miter;
1245         u32 trans = 0;
1246         u32 this_sg;
1247         bool next_sg;
1248
1249         to_host = usb_pipein(urb->pipe);
1250         rbuf = req->req.buf + req->req.actual;
1251
1252         if (!urb->num_sgs) {
1253                 ubuf = urb->transfer_buffer + urb->actual_length;
1254                 if (to_host)
1255                         memcpy(ubuf, rbuf, len);
1256                 else
1257                         memcpy(rbuf, ubuf, len);
1258                 return len;
1259         }
1260
1261         if (!urbp->miter_started) {
1262                 u32 flags = SG_MITER_ATOMIC;
1263
1264                 if (to_host)
1265                         flags |= SG_MITER_TO_SG;
1266                 else
1267                         flags |= SG_MITER_FROM_SG;
1268
1269                 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1270                 urbp->miter_started = 1;
1271         }
1272         next_sg = sg_miter_next(miter);
1273         if (next_sg == false) {
1274                 WARN_ON_ONCE(1);
1275                 return -EINVAL;
1276         }
1277         do {
1278                 ubuf = miter->addr;
1279                 this_sg = min_t(u32, len, miter->length);
1280                 miter->consumed = this_sg;
1281                 trans += this_sg;
1282
1283                 if (to_host)
1284                         memcpy(ubuf, rbuf, this_sg);
1285                 else
1286                         memcpy(rbuf, ubuf, this_sg);
1287                 len -= this_sg;
1288
1289                 if (!len)
1290                         break;
1291                 next_sg = sg_miter_next(miter);
1292                 if (next_sg == false) {
1293                         WARN_ON_ONCE(1);
1294                         return -EINVAL;
1295                 }
1296
1297                 rbuf += this_sg;
1298         } while (1);
1299
1300         sg_miter_stop(miter);
1301         return trans;
1302 }
1303
1304 /* transfer up to a frame's worth; caller must own lock */
1305 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1306                 struct dummy_ep *ep, int limit, int *status)
1307 {
1308         struct dummy            *dum = dum_hcd->dum;
1309         struct dummy_request    *req;
1310
1311 top:
1312         /* if there's no request queued, the device is NAKing; return */
1313         list_for_each_entry(req, &ep->queue, queue) {
1314                 unsigned        host_len, dev_len, len;
1315                 int             is_short, to_host;
1316                 int             rescan = 0;
1317
1318                 if (dummy_ep_stream_en(dum_hcd, urb)) {
1319                         if ((urb->stream_id != req->req.stream_id))
1320                                 continue;
1321                 }
1322
1323                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1324                  * may be short (including zero length).
1325                  *
1326                  * writer can send a zlp explicitly (length 0) or implicitly
1327                  * (length mod maxpacket zero, and 'zero' flag); they always
1328                  * terminate reads.
1329                  */
1330                 host_len = urb->transfer_buffer_length - urb->actual_length;
1331                 dev_len = req->req.length - req->req.actual;
1332                 len = min(host_len, dev_len);
1333
1334                 /* FIXME update emulated data toggle too */
1335
1336                 to_host = usb_pipein(urb->pipe);
1337                 if (unlikely(len == 0))
1338                         is_short = 1;
1339                 else {
1340                         /* not enough bandwidth left? */
1341                         if (limit < ep->ep.maxpacket && limit < len)
1342                                 break;
1343                         len = min_t(unsigned, len, limit);
1344                         if (len == 0)
1345                                 break;
1346
1347                         /* use an extra pass for the final short packet */
1348                         if (len > ep->ep.maxpacket) {
1349                                 rescan = 1;
1350                                 len -= (len % ep->ep.maxpacket);
1351                         }
1352                         is_short = (len % ep->ep.maxpacket) != 0;
1353
1354                         len = dummy_perform_transfer(urb, req, len);
1355
1356                         ep->last_io = jiffies;
1357                         if ((int)len < 0) {
1358                                 req->req.status = len;
1359                         } else {
1360                                 limit -= len;
1361                                 urb->actual_length += len;
1362                                 req->req.actual += len;
1363                         }
1364                 }
1365
1366                 /* short packets terminate, maybe with overflow/underflow.
1367                  * it's only really an error to write too much.
1368                  *
1369                  * partially filling a buffer optionally blocks queue advances
1370                  * (so completion handlers can clean up the queue) but we don't
1371                  * need to emulate such data-in-flight.
1372                  */
1373                 if (is_short) {
1374                         if (host_len == dev_len) {
1375                                 req->req.status = 0;
1376                                 *status = 0;
1377                         } else if (to_host) {
1378                                 req->req.status = 0;
1379                                 if (dev_len > host_len)
1380                                         *status = -EOVERFLOW;
1381                                 else
1382                                         *status = 0;
1383                         } else if (!to_host) {
1384                                 *status = 0;
1385                                 if (host_len > dev_len)
1386                                         req->req.status = -EOVERFLOW;
1387                                 else
1388                                         req->req.status = 0;
1389                         }
1390
1391                 /* many requests terminate without a short packet */
1392                 } else {
1393                         if (req->req.length == req->req.actual
1394                                         && !req->req.zero)
1395                                 req->req.status = 0;
1396                         if (urb->transfer_buffer_length == urb->actual_length
1397                                         && !(urb->transfer_flags
1398                                                 & URB_ZERO_PACKET))
1399                                 *status = 0;
1400                 }
1401
1402                 /* device side completion --> continuable */
1403                 if (req->req.status != -EINPROGRESS) {
1404                         list_del_init(&req->queue);
1405
1406                         spin_unlock(&dum->lock);
1407                         req->req.complete(&ep->ep, &req->req);
1408                         spin_lock(&dum->lock);
1409
1410                         /* requests might have been unlinked... */
1411                         rescan = 1;
1412                 }
1413
1414                 /* host side completion --> terminate */
1415                 if (*status != -EINPROGRESS)
1416                         break;
1417
1418                 /* rescan to continue with any other queued i/o */
1419                 if (rescan)
1420                         goto top;
1421         }
1422         return limit;
1423 }
1424
1425 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1426 {
1427         int     limit = ep->ep.maxpacket;
1428
1429         if (dum->gadget.speed == USB_SPEED_HIGH) {
1430                 int     tmp;
1431
1432                 /* high bandwidth mode */
1433                 tmp = usb_endpoint_maxp(ep->desc);
1434                 tmp = (tmp >> 11) & 0x03;
1435                 tmp *= 8 /* applies to entire frame */;
1436                 limit += limit * tmp;
1437         }
1438         if (dum->gadget.speed == USB_SPEED_SUPER) {
1439                 switch (usb_endpoint_type(ep->desc)) {
1440                 case USB_ENDPOINT_XFER_ISOC:
1441                         /* Sec. 4.4.8.2 USB3.0 Spec */
1442                         limit = 3 * 16 * 1024 * 8;
1443                         break;
1444                 case USB_ENDPOINT_XFER_INT:
1445                         /* Sec. 4.4.7.2 USB3.0 Spec */
1446                         limit = 3 * 1024 * 8;
1447                         break;
1448                 case USB_ENDPOINT_XFER_BULK:
1449                 default:
1450                         break;
1451                 }
1452         }
1453         return limit;
1454 }
1455
1456 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1457                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1458                         USB_PORT_STAT_SUSPEND)) \
1459                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1460
1461 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1462 {
1463         int             i;
1464
1465         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1466                         dum->ss_hcd : dum->hs_hcd)))
1467                 return NULL;
1468         if ((address & ~USB_DIR_IN) == 0)
1469                 return &dum->ep[0];
1470         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1471                 struct dummy_ep *ep = &dum->ep[i];
1472
1473                 if (!ep->desc)
1474                         continue;
1475                 if (ep->desc->bEndpointAddress == address)
1476                         return ep;
1477         }
1478         return NULL;
1479 }
1480
1481 #undef is_active
1482
1483 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1484 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1485 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1486 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1487 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1488 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1489
1490
1491 /**
1492  * handle_control_request() - handles all control transfers
1493  * @dum: pointer to dummy (the_controller)
1494  * @urb: the urb request to handle
1495  * @setup: pointer to the setup data for a USB device control
1496  *       request
1497  * @status: pointer to request handling status
1498  *
1499  * Return 0 - if the request was handled
1500  *        1 - if the request wasn't handles
1501  *        error code on error
1502  */
1503 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1504                                   struct usb_ctrlrequest *setup,
1505                                   int *status)
1506 {
1507         struct dummy_ep         *ep2;
1508         struct dummy            *dum = dum_hcd->dum;
1509         int                     ret_val = 1;
1510         unsigned        w_index;
1511         unsigned        w_value;
1512
1513         w_index = le16_to_cpu(setup->wIndex);
1514         w_value = le16_to_cpu(setup->wValue);
1515         switch (setup->bRequest) {
1516         case USB_REQ_SET_ADDRESS:
1517                 if (setup->bRequestType != Dev_Request)
1518                         break;
1519                 dum->address = w_value;
1520                 *status = 0;
1521                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1522                                 w_value);
1523                 ret_val = 0;
1524                 break;
1525         case USB_REQ_SET_FEATURE:
1526                 if (setup->bRequestType == Dev_Request) {
1527                         ret_val = 0;
1528                         switch (w_value) {
1529                         case USB_DEVICE_REMOTE_WAKEUP:
1530                                 break;
1531                         case USB_DEVICE_B_HNP_ENABLE:
1532                                 dum->gadget.b_hnp_enable = 1;
1533                                 break;
1534                         case USB_DEVICE_A_HNP_SUPPORT:
1535                                 dum->gadget.a_hnp_support = 1;
1536                                 break;
1537                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1538                                 dum->gadget.a_alt_hnp_support = 1;
1539                                 break;
1540                         case USB_DEVICE_U1_ENABLE:
1541                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1542                                     HCD_USB3)
1543                                         w_value = USB_DEV_STAT_U1_ENABLED;
1544                                 else
1545                                         ret_val = -EOPNOTSUPP;
1546                                 break;
1547                         case USB_DEVICE_U2_ENABLE:
1548                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1549                                     HCD_USB3)
1550                                         w_value = USB_DEV_STAT_U2_ENABLED;
1551                                 else
1552                                         ret_val = -EOPNOTSUPP;
1553                                 break;
1554                         case USB_DEVICE_LTM_ENABLE:
1555                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1556                                     HCD_USB3)
1557                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1558                                 else
1559                                         ret_val = -EOPNOTSUPP;
1560                                 break;
1561                         default:
1562                                 ret_val = -EOPNOTSUPP;
1563                         }
1564                         if (ret_val == 0) {
1565                                 dum->devstatus |= (1 << w_value);
1566                                 *status = 0;
1567                         }
1568                 } else if (setup->bRequestType == Ep_Request) {
1569                         /* endpoint halt */
1570                         ep2 = find_endpoint(dum, w_index);
1571                         if (!ep2 || ep2->ep.name == ep0name) {
1572                                 ret_val = -EOPNOTSUPP;
1573                                 break;
1574                         }
1575                         ep2->halted = 1;
1576                         ret_val = 0;
1577                         *status = 0;
1578                 }
1579                 break;
1580         case USB_REQ_CLEAR_FEATURE:
1581                 if (setup->bRequestType == Dev_Request) {
1582                         ret_val = 0;
1583                         switch (w_value) {
1584                         case USB_DEVICE_REMOTE_WAKEUP:
1585                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1586                                 break;
1587                         case USB_DEVICE_U1_ENABLE:
1588                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1589                                     HCD_USB3)
1590                                         w_value = USB_DEV_STAT_U1_ENABLED;
1591                                 else
1592                                         ret_val = -EOPNOTSUPP;
1593                                 break;
1594                         case USB_DEVICE_U2_ENABLE:
1595                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1596                                     HCD_USB3)
1597                                         w_value = USB_DEV_STAT_U2_ENABLED;
1598                                 else
1599                                         ret_val = -EOPNOTSUPP;
1600                                 break;
1601                         case USB_DEVICE_LTM_ENABLE:
1602                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1603                                     HCD_USB3)
1604                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1605                                 else
1606                                         ret_val = -EOPNOTSUPP;
1607                                 break;
1608                         default:
1609                                 ret_val = -EOPNOTSUPP;
1610                                 break;
1611                         }
1612                         if (ret_val == 0) {
1613                                 dum->devstatus &= ~(1 << w_value);
1614                                 *status = 0;
1615                         }
1616                 } else if (setup->bRequestType == Ep_Request) {
1617                         /* endpoint halt */
1618                         ep2 = find_endpoint(dum, w_index);
1619                         if (!ep2) {
1620                                 ret_val = -EOPNOTSUPP;
1621                                 break;
1622                         }
1623                         if (!ep2->wedged)
1624                                 ep2->halted = 0;
1625                         ret_val = 0;
1626                         *status = 0;
1627                 }
1628                 break;
1629         case USB_REQ_GET_STATUS:
1630                 if (setup->bRequestType == Dev_InRequest
1631                                 || setup->bRequestType == Intf_InRequest
1632                                 || setup->bRequestType == Ep_InRequest) {
1633                         char *buf;
1634                         /*
1635                          * device: remote wakeup, selfpowered
1636                          * interface: nothing
1637                          * endpoint: halt
1638                          */
1639                         buf = (char *)urb->transfer_buffer;
1640                         if (urb->transfer_buffer_length > 0) {
1641                                 if (setup->bRequestType == Ep_InRequest) {
1642                                         ep2 = find_endpoint(dum, w_index);
1643                                         if (!ep2) {
1644                                                 ret_val = -EOPNOTSUPP;
1645                                                 break;
1646                                         }
1647                                         buf[0] = ep2->halted;
1648                                 } else if (setup->bRequestType ==
1649                                            Dev_InRequest) {
1650                                         buf[0] = (u8)dum->devstatus;
1651                                 } else
1652                                         buf[0] = 0;
1653                         }
1654                         if (urb->transfer_buffer_length > 1)
1655                                 buf[1] = 0;
1656                         urb->actual_length = min_t(u32, 2,
1657                                 urb->transfer_buffer_length);
1658                         ret_val = 0;
1659                         *status = 0;
1660                 }
1661                 break;
1662         }
1663         return ret_val;
1664 }
1665
1666 /* drive both sides of the transfers; looks like irq handlers to
1667  * both drivers except the callbacks aren't in_irq().
1668  */
1669 static void dummy_timer(unsigned long _dum_hcd)
1670 {
1671         struct dummy_hcd        *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1672         struct dummy            *dum = dum_hcd->dum;
1673         struct urbp             *urbp, *tmp;
1674         unsigned long           flags;
1675         int                     limit, total;
1676         int                     i;
1677
1678         /* simplistic model for one frame's bandwidth */
1679         switch (dum->gadget.speed) {
1680         case USB_SPEED_LOW:
1681                 total = 8/*bytes*/ * 12/*packets*/;
1682                 break;
1683         case USB_SPEED_FULL:
1684                 total = 64/*bytes*/ * 19/*packets*/;
1685                 break;
1686         case USB_SPEED_HIGH:
1687                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1688                 break;
1689         case USB_SPEED_SUPER:
1690                 /* Bus speed is 500000 bytes/ms, so use a little less */
1691                 total = 490000;
1692                 break;
1693         default:
1694                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1695                 return;
1696         }
1697
1698         /* FIXME if HZ != 1000 this will probably misbehave ... */
1699
1700         /* look at each urb queued by the host side driver */
1701         spin_lock_irqsave(&dum->lock, flags);
1702
1703         if (!dum_hcd->udev) {
1704                 dev_err(dummy_dev(dum_hcd),
1705                                 "timer fired with no URBs pending?\n");
1706                 spin_unlock_irqrestore(&dum->lock, flags);
1707                 return;
1708         }
1709
1710         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1711                 if (!ep_name[i])
1712                         break;
1713                 dum->ep[i].already_seen = 0;
1714         }
1715
1716 restart:
1717         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1718                 struct urb              *urb;
1719                 struct dummy_request    *req;
1720                 u8                      address;
1721                 struct dummy_ep         *ep = NULL;
1722                 int                     type;
1723                 int                     status = -EINPROGRESS;
1724
1725                 urb = urbp->urb;
1726                 if (urb->unlinked)
1727                         goto return_urb;
1728                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1729                         continue;
1730                 type = usb_pipetype(urb->pipe);
1731
1732                 /* used up this frame's non-periodic bandwidth?
1733                  * FIXME there's infinite bandwidth for control and
1734                  * periodic transfers ... unrealistic.
1735                  */
1736                 if (total <= 0 && type == PIPE_BULK)
1737                         continue;
1738
1739                 /* find the gadget's ep for this request (if configured) */
1740                 address = usb_pipeendpoint (urb->pipe);
1741                 if (usb_pipein(urb->pipe))
1742                         address |= USB_DIR_IN;
1743                 ep = find_endpoint(dum, address);
1744                 if (!ep) {
1745                         /* set_configuration() disagreement */
1746                         dev_dbg(dummy_dev(dum_hcd),
1747                                 "no ep configured for urb %p\n",
1748                                 urb);
1749                         status = -EPROTO;
1750                         goto return_urb;
1751                 }
1752
1753                 if (ep->already_seen)
1754                         continue;
1755                 ep->already_seen = 1;
1756                 if (ep == &dum->ep[0] && urb->error_count) {
1757                         ep->setup_stage = 1;    /* a new urb */
1758                         urb->error_count = 0;
1759                 }
1760                 if (ep->halted && !ep->setup_stage) {
1761                         /* NOTE: must not be iso! */
1762                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1763                                         ep->ep.name, urb);
1764                         status = -EPIPE;
1765                         goto return_urb;
1766                 }
1767                 /* FIXME make sure both ends agree on maxpacket */
1768
1769                 /* handle control requests */
1770                 if (ep == &dum->ep[0] && ep->setup_stage) {
1771                         struct usb_ctrlrequest          setup;
1772                         int                             value = 1;
1773
1774                         setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1775                         /* paranoia, in case of stale queued data */
1776                         list_for_each_entry(req, &ep->queue, queue) {
1777                                 list_del_init(&req->queue);
1778                                 req->req.status = -EOVERFLOW;
1779                                 dev_dbg(udc_dev(dum), "stale req = %p\n",
1780                                                 req);
1781
1782                                 spin_unlock(&dum->lock);
1783                                 req->req.complete(&ep->ep, &req->req);
1784                                 spin_lock(&dum->lock);
1785                                 ep->already_seen = 0;
1786                                 goto restart;
1787                         }
1788
1789                         /* gadget driver never sees set_address or operations
1790                          * on standard feature flags.  some hardware doesn't
1791                          * even expose them.
1792                          */
1793                         ep->last_io = jiffies;
1794                         ep->setup_stage = 0;
1795                         ep->halted = 0;
1796
1797                         value = handle_control_request(dum_hcd, urb, &setup,
1798                                                        &status);
1799
1800                         /* gadget driver handles all other requests.  block
1801                          * until setup() returns; no reentrancy issues etc.
1802                          */
1803                         if (value > 0) {
1804                                 spin_unlock(&dum->lock);
1805                                 value = dum->driver->setup(&dum->gadget,
1806                                                 &setup);
1807                                 spin_lock(&dum->lock);
1808
1809                                 if (value >= 0) {
1810                                         /* no delays (max 64KB data stage) */
1811                                         limit = 64*1024;
1812                                         goto treat_control_like_bulk;
1813                                 }
1814                                 /* error, see below */
1815                         }
1816
1817                         if (value < 0) {
1818                                 if (value != -EOPNOTSUPP)
1819                                         dev_dbg(udc_dev(dum),
1820                                                 "setup --> %d\n",
1821                                                 value);
1822                                 status = -EPIPE;
1823                                 urb->actual_length = 0;
1824                         }
1825
1826                         goto return_urb;
1827                 }
1828
1829                 /* non-control requests */
1830                 limit = total;
1831                 switch (usb_pipetype(urb->pipe)) {
1832                 case PIPE_ISOCHRONOUS:
1833                         /* FIXME is it urb->interval since the last xfer?
1834                          * use urb->iso_frame_desc[i].
1835                          * complete whether or not ep has requests queued.
1836                          * report random errors, to debug drivers.
1837                          */
1838                         limit = max(limit, periodic_bytes(dum, ep));
1839                         status = -ENOSYS;
1840                         break;
1841
1842                 case PIPE_INTERRUPT:
1843                         /* FIXME is it urb->interval since the last xfer?
1844                          * this almost certainly polls too fast.
1845                          */
1846                         limit = max(limit, periodic_bytes(dum, ep));
1847                         /* FALLTHROUGH */
1848
1849                 default:
1850 treat_control_like_bulk:
1851                         ep->last_io = jiffies;
1852                         total = transfer(dum_hcd, urb, ep, limit, &status);
1853                         break;
1854                 }
1855
1856                 /* incomplete transfer? */
1857                 if (status == -EINPROGRESS)
1858                         continue;
1859
1860 return_urb:
1861                 list_del(&urbp->urbp_list);
1862                 kfree(urbp);
1863                 if (ep)
1864                         ep->already_seen = ep->setup_stage = 0;
1865
1866                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1867                 spin_unlock(&dum->lock);
1868                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1869                 spin_lock(&dum->lock);
1870
1871                 goto restart;
1872         }
1873
1874         if (list_empty(&dum_hcd->urbp_list)) {
1875                 usb_put_dev(dum_hcd->udev);
1876                 dum_hcd->udev = NULL;
1877         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1878                 /* want a 1 msec delay here */
1879                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1880         }
1881
1882         spin_unlock_irqrestore(&dum->lock, flags);
1883 }
1884
1885 /*-------------------------------------------------------------------------*/
1886
1887 #define PORT_C_MASK \
1888         ((USB_PORT_STAT_C_CONNECTION \
1889         | USB_PORT_STAT_C_ENABLE \
1890         | USB_PORT_STAT_C_SUSPEND \
1891         | USB_PORT_STAT_C_OVERCURRENT \
1892         | USB_PORT_STAT_C_RESET) << 16)
1893
1894 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1895 {
1896         struct dummy_hcd        *dum_hcd;
1897         unsigned long           flags;
1898         int                     retval = 0;
1899
1900         dum_hcd = hcd_to_dummy_hcd(hcd);
1901
1902         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1903         if (!HCD_HW_ACCESSIBLE(hcd))
1904                 goto done;
1905
1906         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1907                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1908                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1909                 set_link_state(dum_hcd);
1910         }
1911
1912         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1913                 *buf = (1 << 1);
1914                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1915                                 dum_hcd->port_status);
1916                 retval = 1;
1917                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1918                         usb_hcd_resume_root_hub(hcd);
1919         }
1920 done:
1921         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1922         return retval;
1923 }
1924
1925 /* usb 3.0 root hub device descriptor */
1926 struct {
1927         struct usb_bos_descriptor bos;
1928         struct usb_ss_cap_descriptor ss_cap;
1929 } __packed usb3_bos_desc = {
1930
1931         .bos = {
1932                 .bLength                = USB_DT_BOS_SIZE,
1933                 .bDescriptorType        = USB_DT_BOS,
1934                 .wTotalLength           = cpu_to_le16(sizeof(usb3_bos_desc)),
1935                 .bNumDeviceCaps         = 1,
1936         },
1937         .ss_cap = {
1938                 .bLength                = USB_DT_USB_SS_CAP_SIZE,
1939                 .bDescriptorType        = USB_DT_DEVICE_CAPABILITY,
1940                 .bDevCapabilityType     = USB_SS_CAP_TYPE,
1941                 .wSpeedSupported        = cpu_to_le16(USB_5GBPS_OPERATION),
1942                 .bFunctionalitySupport  = ilog2(USB_5GBPS_OPERATION),
1943         },
1944 };
1945
1946 static inline void
1947 ss_hub_descriptor(struct usb_hub_descriptor *desc)
1948 {
1949         memset(desc, 0, sizeof *desc);
1950         desc->bDescriptorType = 0x2a;
1951         desc->bDescLength = 12;
1952         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1953         desc->bNbrPorts = 1;
1954         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
1955         desc->u.ss.DeviceRemovable = 0xffff;
1956 }
1957
1958 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
1959 {
1960         memset(desc, 0, sizeof *desc);
1961         desc->bDescriptorType = 0x29;
1962         desc->bDescLength = 9;
1963         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1964         desc->bNbrPorts = 1;
1965         desc->u.hs.DeviceRemovable[0] = 0xff;
1966         desc->u.hs.DeviceRemovable[1] = 0xff;
1967 }
1968
1969 static int dummy_hub_control(
1970         struct usb_hcd  *hcd,
1971         u16             typeReq,
1972         u16             wValue,
1973         u16             wIndex,
1974         char            *buf,
1975         u16             wLength
1976 ) {
1977         struct dummy_hcd *dum_hcd;
1978         int             retval = 0;
1979         unsigned long   flags;
1980
1981         if (!HCD_HW_ACCESSIBLE(hcd))
1982                 return -ETIMEDOUT;
1983
1984         dum_hcd = hcd_to_dummy_hcd(hcd);
1985
1986         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1987         switch (typeReq) {
1988         case ClearHubFeature:
1989                 break;
1990         case ClearPortFeature:
1991                 switch (wValue) {
1992                 case USB_PORT_FEAT_SUSPEND:
1993                         if (hcd->speed == HCD_USB3) {
1994                                 dev_dbg(dummy_dev(dum_hcd),
1995                                          "USB_PORT_FEAT_SUSPEND req not "
1996                                          "supported for USB 3.0 roothub\n");
1997                                 goto error;
1998                         }
1999                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2000                                 /* 20msec resume signaling */
2001                                 dum_hcd->resuming = 1;
2002                                 dum_hcd->re_timeout = jiffies +
2003                                                 msecs_to_jiffies(20);
2004                         }
2005                         break;
2006                 case USB_PORT_FEAT_POWER:
2007                         if (hcd->speed == HCD_USB3) {
2008                                 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
2009                                         dev_dbg(dummy_dev(dum_hcd),
2010                                                 "power-off\n");
2011                         } else
2012                                 if (dum_hcd->port_status &
2013                                                         USB_SS_PORT_STAT_POWER)
2014                                         dev_dbg(dummy_dev(dum_hcd),
2015                                                 "power-off\n");
2016                         /* FALLS THROUGH */
2017                 default:
2018                         dum_hcd->port_status &= ~(1 << wValue);
2019                         set_link_state(dum_hcd);
2020                 }
2021                 break;
2022         case GetHubDescriptor:
2023                 if (hcd->speed == HCD_USB3 &&
2024                                 (wLength < USB_DT_SS_HUB_SIZE ||
2025                                  wValue != (USB_DT_SS_HUB << 8))) {
2026                         dev_dbg(dummy_dev(dum_hcd),
2027                                 "Wrong hub descriptor type for "
2028                                 "USB 3.0 roothub.\n");
2029                         goto error;
2030                 }
2031                 if (hcd->speed == HCD_USB3)
2032                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2033                 else
2034                         hub_descriptor((struct usb_hub_descriptor *) buf);
2035                 break;
2036
2037         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2038                 if (hcd->speed != HCD_USB3)
2039                         goto error;
2040
2041                 if ((wValue >> 8) != USB_DT_BOS)
2042                         goto error;
2043
2044                 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2045                 retval = sizeof(usb3_bos_desc);
2046                 break;
2047
2048         case GetHubStatus:
2049                 *(__le32 *) buf = cpu_to_le32(0);
2050                 break;
2051         case GetPortStatus:
2052                 if (wIndex != 1)
2053                         retval = -EPIPE;
2054
2055                 /* whoever resets or resumes must GetPortStatus to
2056                  * complete it!!
2057                  */
2058                 if (dum_hcd->resuming &&
2059                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2060                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2061                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2062                 }
2063                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2064                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2065                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2066                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2067                         if (dum_hcd->dum->pullup) {
2068                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2069
2070                                 if (hcd->speed < HCD_USB3) {
2071                                         switch (dum_hcd->dum->gadget.speed) {
2072                                         case USB_SPEED_HIGH:
2073                                                 dum_hcd->port_status |=
2074                                                       USB_PORT_STAT_HIGH_SPEED;
2075                                                 break;
2076                                         case USB_SPEED_LOW:
2077                                                 dum_hcd->dum->gadget.ep0->
2078                                                         maxpacket = 8;
2079                                                 dum_hcd->port_status |=
2080                                                         USB_PORT_STAT_LOW_SPEED;
2081                                                 break;
2082                                         default:
2083                                                 dum_hcd->dum->gadget.speed =
2084                                                         USB_SPEED_FULL;
2085                                                 break;
2086                                         }
2087                                 }
2088                         }
2089                 }
2090                 set_link_state(dum_hcd);
2091                 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2092                 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2093                 break;
2094         case SetHubFeature:
2095                 retval = -EPIPE;
2096                 break;
2097         case SetPortFeature:
2098                 switch (wValue) {
2099                 case USB_PORT_FEAT_LINK_STATE:
2100                         if (hcd->speed != HCD_USB3) {
2101                                 dev_dbg(dummy_dev(dum_hcd),
2102                                          "USB_PORT_FEAT_LINK_STATE req not "
2103                                          "supported for USB 2.0 roothub\n");
2104                                 goto error;
2105                         }
2106                         /*
2107                          * Since this is dummy we don't have an actual link so
2108                          * there is nothing to do for the SET_LINK_STATE cmd
2109                          */
2110                         break;
2111                 case USB_PORT_FEAT_U1_TIMEOUT:
2112                 case USB_PORT_FEAT_U2_TIMEOUT:
2113                         /* TODO: add suspend/resume support! */
2114                         if (hcd->speed != HCD_USB3) {
2115                                 dev_dbg(dummy_dev(dum_hcd),
2116                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2117                                          "supported for USB 2.0 roothub\n");
2118                                 goto error;
2119                         }
2120                         break;
2121                 case USB_PORT_FEAT_SUSPEND:
2122                         /* Applicable only for USB2.0 hub */
2123                         if (hcd->speed == HCD_USB3) {
2124                                 dev_dbg(dummy_dev(dum_hcd),
2125                                          "USB_PORT_FEAT_SUSPEND req not "
2126                                          "supported for USB 3.0 roothub\n");
2127                                 goto error;
2128                         }
2129                         if (dum_hcd->active) {
2130                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2131
2132                                 /* HNP would happen here; for now we
2133                                  * assume b_bus_req is always true.
2134                                  */
2135                                 set_link_state(dum_hcd);
2136                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2137                                                 & dum_hcd->dum->devstatus) != 0)
2138                                         dev_dbg(dummy_dev(dum_hcd),
2139                                                         "no HNP yet!\n");
2140                         }
2141                         break;
2142                 case USB_PORT_FEAT_POWER:
2143                         if (hcd->speed == HCD_USB3)
2144                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2145                         else
2146                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2147                         set_link_state(dum_hcd);
2148                         break;
2149                 case USB_PORT_FEAT_BH_PORT_RESET:
2150                         /* Applicable only for USB3.0 hub */
2151                         if (hcd->speed != HCD_USB3) {
2152                                 dev_dbg(dummy_dev(dum_hcd),
2153                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
2154                                          "supported for USB 2.0 roothub\n");
2155                                 goto error;
2156                         }
2157                         /* FALLS THROUGH */
2158                 case USB_PORT_FEAT_RESET:
2159                         /* if it's already enabled, disable */
2160                         if (hcd->speed == HCD_USB3) {
2161                                 dum_hcd->port_status = 0;
2162                                 dum_hcd->port_status =
2163                                         (USB_SS_PORT_STAT_POWER |
2164                                          USB_PORT_STAT_CONNECTION |
2165                                          USB_PORT_STAT_RESET);
2166                         } else
2167                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2168                                         | USB_PORT_STAT_LOW_SPEED
2169                                         | USB_PORT_STAT_HIGH_SPEED);
2170                         /*
2171                          * We want to reset device status. All but the
2172                          * Self powered feature
2173                          */
2174                         dum_hcd->dum->devstatus &=
2175                                 (1 << USB_DEVICE_SELF_POWERED);
2176                         /*
2177                          * FIXME USB3.0: what is the correct reset signaling
2178                          * interval? Is it still 50msec as for HS?
2179                          */
2180                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2181                         /* FALLS THROUGH */
2182                 default:
2183                         if (hcd->speed == HCD_USB3) {
2184                                 if ((dum_hcd->port_status &
2185                                      USB_SS_PORT_STAT_POWER) != 0) {
2186                                         dum_hcd->port_status |= (1 << wValue);
2187                                         set_link_state(dum_hcd);
2188                                 }
2189                         } else
2190                                 if ((dum_hcd->port_status &
2191                                      USB_PORT_STAT_POWER) != 0) {
2192                                         dum_hcd->port_status |= (1 << wValue);
2193                                         set_link_state(dum_hcd);
2194                                 }
2195                 }
2196                 break;
2197         case GetPortErrorCount:
2198                 if (hcd->speed != HCD_USB3) {
2199                         dev_dbg(dummy_dev(dum_hcd),
2200                                  "GetPortErrorCount req not "
2201                                  "supported for USB 2.0 roothub\n");
2202                         goto error;
2203                 }
2204                 /* We'll always return 0 since this is a dummy hub */
2205                 *(__le32 *) buf = cpu_to_le32(0);
2206                 break;
2207         case SetHubDepth:
2208                 if (hcd->speed != HCD_USB3) {
2209                         dev_dbg(dummy_dev(dum_hcd),
2210                                  "SetHubDepth req not supported for "
2211                                  "USB 2.0 roothub\n");
2212                         goto error;
2213                 }
2214                 break;
2215         default:
2216                 dev_dbg(dummy_dev(dum_hcd),
2217                         "hub control req%04x v%04x i%04x l%d\n",
2218                         typeReq, wValue, wIndex, wLength);
2219 error:
2220                 /* "protocol stall" on error */
2221                 retval = -EPIPE;
2222         }
2223         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2224
2225         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2226                 usb_hcd_poll_rh_status(hcd);
2227         return retval;
2228 }
2229
2230 static int dummy_bus_suspend(struct usb_hcd *hcd)
2231 {
2232         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2233
2234         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2235
2236         spin_lock_irq(&dum_hcd->dum->lock);
2237         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2238         set_link_state(dum_hcd);
2239         hcd->state = HC_STATE_SUSPENDED;
2240         spin_unlock_irq(&dum_hcd->dum->lock);
2241         return 0;
2242 }
2243
2244 static int dummy_bus_resume(struct usb_hcd *hcd)
2245 {
2246         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2247         int rc = 0;
2248
2249         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2250
2251         spin_lock_irq(&dum_hcd->dum->lock);
2252         if (!HCD_HW_ACCESSIBLE(hcd)) {
2253                 rc = -ESHUTDOWN;
2254         } else {
2255                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2256                 set_link_state(dum_hcd);
2257                 if (!list_empty(&dum_hcd->urbp_list))
2258                         mod_timer(&dum_hcd->timer, jiffies);
2259                 hcd->state = HC_STATE_RUNNING;
2260         }
2261         spin_unlock_irq(&dum_hcd->dum->lock);
2262         return rc;
2263 }
2264
2265 /*-------------------------------------------------------------------------*/
2266
2267 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2268 {
2269         int ep = usb_pipeendpoint(urb->pipe);
2270
2271         return snprintf(buf, size,
2272                 "urb/%p %s ep%d%s%s len %d/%d\n",
2273                 urb,
2274                 ({ char *s;
2275                 switch (urb->dev->speed) {
2276                 case USB_SPEED_LOW:
2277                         s = "ls";
2278                         break;
2279                 case USB_SPEED_FULL:
2280                         s = "fs";
2281                         break;
2282                 case USB_SPEED_HIGH:
2283                         s = "hs";
2284                         break;
2285                 case USB_SPEED_SUPER:
2286                         s = "ss";
2287                         break;
2288                 default:
2289                         s = "?";
2290                         break;
2291                  }; s; }),
2292                 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2293                 ({ char *s; \
2294                 switch (usb_pipetype(urb->pipe)) { \
2295                 case PIPE_CONTROL: \
2296                         s = ""; \
2297                         break; \
2298                 case PIPE_BULK: \
2299                         s = "-bulk"; \
2300                         break; \
2301                 case PIPE_INTERRUPT: \
2302                         s = "-int"; \
2303                         break; \
2304                 default: \
2305                         s = "-iso"; \
2306                         break; \
2307                 }; s; }),
2308                 urb->actual_length, urb->transfer_buffer_length);
2309 }
2310
2311 static ssize_t show_urbs(struct device *dev, struct device_attribute *attr,
2312                 char *buf)
2313 {
2314         struct usb_hcd          *hcd = dev_get_drvdata(dev);
2315         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2316         struct urbp             *urbp;
2317         size_t                  size = 0;
2318         unsigned long           flags;
2319
2320         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2321         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2322                 size_t          temp;
2323
2324                 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2325                 buf += temp;
2326                 size += temp;
2327         }
2328         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2329
2330         return size;
2331 }
2332 static DEVICE_ATTR(urbs, S_IRUGO, show_urbs, NULL);
2333
2334 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2335 {
2336         init_timer(&dum_hcd->timer);
2337         dum_hcd->timer.function = dummy_timer;
2338         dum_hcd->timer.data = (unsigned long)dum_hcd;
2339         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2340         dum_hcd->stream_en_ep = 0;
2341         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2342         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2343         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2344         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2345 #ifdef CONFIG_USB_OTG
2346         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2347 #endif
2348         return 0;
2349
2350         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2351         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2352 }
2353
2354 static int dummy_start(struct usb_hcd *hcd)
2355 {
2356         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2357
2358         /*
2359          * MASTER side init ... we emulate a root hub that'll only ever
2360          * talk to one device (the slave side).  Also appears in sysfs,
2361          * just like more familiar pci-based HCDs.
2362          */
2363         if (!usb_hcd_is_primary_hcd(hcd))
2364                 return dummy_start_ss(dum_hcd);
2365
2366         spin_lock_init(&dum_hcd->dum->lock);
2367         init_timer(&dum_hcd->timer);
2368         dum_hcd->timer.function = dummy_timer;
2369         dum_hcd->timer.data = (unsigned long)dum_hcd;
2370         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2371
2372         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2373
2374         hcd->power_budget = POWER_BUDGET;
2375         hcd->state = HC_STATE_RUNNING;
2376         hcd->uses_new_polling = 1;
2377
2378 #ifdef CONFIG_USB_OTG
2379         hcd->self.otg_port = 1;
2380 #endif
2381
2382         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2383         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2384 }
2385
2386 static void dummy_stop(struct usb_hcd *hcd)
2387 {
2388         struct dummy            *dum;
2389
2390         dum = hcd_to_dummy_hcd(hcd)->dum;
2391         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2392         usb_gadget_unregister_driver(dum->driver);
2393         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2394 }
2395
2396 /*-------------------------------------------------------------------------*/
2397
2398 static int dummy_h_get_frame(struct usb_hcd *hcd)
2399 {
2400         return dummy_g_get_frame(NULL);
2401 }
2402
2403 static int dummy_setup(struct usb_hcd *hcd)
2404 {
2405         struct dummy *dum;
2406
2407         dum = *((void **)dev_get_platdata(hcd->self.controller));
2408         hcd->self.sg_tablesize = ~0;
2409         if (usb_hcd_is_primary_hcd(hcd)) {
2410                 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2411                 dum->hs_hcd->dum = dum;
2412                 /*
2413                  * Mark the first roothub as being USB 2.0.
2414                  * The USB 3.0 roothub will be registered later by
2415                  * dummy_hcd_probe()
2416                  */
2417                 hcd->speed = HCD_USB2;
2418                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2419         } else {
2420                 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2421                 dum->ss_hcd->dum = dum;
2422                 hcd->speed = HCD_USB3;
2423                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2424         }
2425         return 0;
2426 }
2427
2428 /* Change a group of bulk endpoints to support multiple stream IDs */
2429 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2430         struct usb_host_endpoint **eps, unsigned int num_eps,
2431         unsigned int num_streams, gfp_t mem_flags)
2432 {
2433         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2434         unsigned long flags;
2435         int max_stream;
2436         int ret_streams = num_streams;
2437         unsigned int index;
2438         unsigned int i;
2439
2440         if (!num_eps)
2441                 return -EINVAL;
2442
2443         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2444         for (i = 0; i < num_eps; i++) {
2445                 index = dummy_get_ep_idx(&eps[i]->desc);
2446                 if ((1 << index) & dum_hcd->stream_en_ep) {
2447                         ret_streams = -EINVAL;
2448                         goto out;
2449                 }
2450                 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2451                 if (!max_stream) {
2452                         ret_streams = -EINVAL;
2453                         goto out;
2454                 }
2455                 if (max_stream < ret_streams) {
2456                         dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2457                                         "stream IDs.\n",
2458                                         eps[i]->desc.bEndpointAddress,
2459                                         max_stream);
2460                         ret_streams = max_stream;
2461                 }
2462         }
2463
2464         for (i = 0; i < num_eps; i++) {
2465                 index = dummy_get_ep_idx(&eps[i]->desc);
2466                 dum_hcd->stream_en_ep |= 1 << index;
2467                 set_max_streams_for_pipe(dum_hcd,
2468                                 usb_endpoint_num(&eps[i]->desc), ret_streams);
2469         }
2470 out:
2471         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2472         return ret_streams;
2473 }
2474
2475 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2476 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2477         struct usb_host_endpoint **eps, unsigned int num_eps,
2478         gfp_t mem_flags)
2479 {
2480         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2481         unsigned long flags;
2482         int ret;
2483         unsigned int index;
2484         unsigned int i;
2485
2486         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2487         for (i = 0; i < num_eps; i++) {
2488                 index = dummy_get_ep_idx(&eps[i]->desc);
2489                 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2490                         ret = -EINVAL;
2491                         goto out;
2492                 }
2493         }
2494
2495         for (i = 0; i < num_eps; i++) {
2496                 index = dummy_get_ep_idx(&eps[i]->desc);
2497                 dum_hcd->stream_en_ep &= ~(1 << index);
2498                 set_max_streams_for_pipe(dum_hcd,
2499                                 usb_endpoint_num(&eps[i]->desc), 0);
2500         }
2501         ret = 0;
2502 out:
2503         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2504         return ret;
2505 }
2506
2507 static struct hc_driver dummy_hcd = {
2508         .description =          (char *) driver_name,
2509         .product_desc =         "Dummy host controller",
2510         .hcd_priv_size =        sizeof(struct dummy_hcd),
2511
2512         .flags =                HCD_USB3 | HCD_SHARED,
2513
2514         .reset =                dummy_setup,
2515         .start =                dummy_start,
2516         .stop =                 dummy_stop,
2517
2518         .urb_enqueue =          dummy_urb_enqueue,
2519         .urb_dequeue =          dummy_urb_dequeue,
2520
2521         .get_frame_number =     dummy_h_get_frame,
2522
2523         .hub_status_data =      dummy_hub_status,
2524         .hub_control =          dummy_hub_control,
2525         .bus_suspend =          dummy_bus_suspend,
2526         .bus_resume =           dummy_bus_resume,
2527
2528         .alloc_streams =        dummy_alloc_streams,
2529         .free_streams =         dummy_free_streams,
2530 };
2531
2532 static int dummy_hcd_probe(struct platform_device *pdev)
2533 {
2534         struct dummy            *dum;
2535         struct usb_hcd          *hs_hcd;
2536         struct usb_hcd          *ss_hcd;
2537         int                     retval;
2538
2539         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2540         dum = *((void **)dev_get_platdata(&pdev->dev));
2541
2542         if (!mod_data.is_super_speed)
2543                 dummy_hcd.flags = HCD_USB2;
2544         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2545         if (!hs_hcd)
2546                 return -ENOMEM;
2547         hs_hcd->has_tt = 1;
2548
2549         retval = usb_add_hcd(hs_hcd, 0, 0);
2550         if (retval)
2551                 goto put_usb2_hcd;
2552
2553         if (mod_data.is_super_speed) {
2554                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2555                                         dev_name(&pdev->dev), hs_hcd);
2556                 if (!ss_hcd) {
2557                         retval = -ENOMEM;
2558                         goto dealloc_usb2_hcd;
2559                 }
2560
2561                 retval = usb_add_hcd(ss_hcd, 0, 0);
2562                 if (retval)
2563                         goto put_usb3_hcd;
2564         }
2565         return 0;
2566
2567 put_usb3_hcd:
2568         usb_put_hcd(ss_hcd);
2569 dealloc_usb2_hcd:
2570         usb_remove_hcd(hs_hcd);
2571 put_usb2_hcd:
2572         usb_put_hcd(hs_hcd);
2573         dum->hs_hcd = dum->ss_hcd = NULL;
2574         return retval;
2575 }
2576
2577 static int dummy_hcd_remove(struct platform_device *pdev)
2578 {
2579         struct dummy            *dum;
2580
2581         dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2582
2583         if (dum->ss_hcd) {
2584                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2585                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2586         }
2587
2588         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2589         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2590
2591         dum->hs_hcd = NULL;
2592         dum->ss_hcd = NULL;
2593
2594         return 0;
2595 }
2596
2597 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2598 {
2599         struct usb_hcd          *hcd;
2600         struct dummy_hcd        *dum_hcd;
2601         int                     rc = 0;
2602
2603         dev_dbg(&pdev->dev, "%s\n", __func__);
2604
2605         hcd = platform_get_drvdata(pdev);
2606         dum_hcd = hcd_to_dummy_hcd(hcd);
2607         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2608                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2609                 rc = -EBUSY;
2610         } else
2611                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2612         return rc;
2613 }
2614
2615 static int dummy_hcd_resume(struct platform_device *pdev)
2616 {
2617         struct usb_hcd          *hcd;
2618
2619         dev_dbg(&pdev->dev, "%s\n", __func__);
2620
2621         hcd = platform_get_drvdata(pdev);
2622         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2623         usb_hcd_poll_rh_status(hcd);
2624         return 0;
2625 }
2626
2627 static struct platform_driver dummy_hcd_driver = {
2628         .probe          = dummy_hcd_probe,
2629         .remove         = dummy_hcd_remove,
2630         .suspend        = dummy_hcd_suspend,
2631         .resume         = dummy_hcd_resume,
2632         .driver         = {
2633                 .name   = (char *) driver_name,
2634                 .owner  = THIS_MODULE,
2635         },
2636 };
2637
2638 /*-------------------------------------------------------------------------*/
2639 #define MAX_NUM_UDC     2
2640 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2641 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2642
2643 static int __init init(void)
2644 {
2645         int     retval = -ENOMEM;
2646         int     i;
2647         struct  dummy *dum[MAX_NUM_UDC];
2648
2649         if (usb_disabled())
2650                 return -ENODEV;
2651
2652         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2653                 return -EINVAL;
2654
2655         if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2656                 pr_err("Number of emulated UDC must be in range of 1…%d\n",
2657                                 MAX_NUM_UDC);
2658                 return -EINVAL;
2659         }
2660
2661         for (i = 0; i < mod_data.num; i++) {
2662                 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2663                 if (!the_hcd_pdev[i]) {
2664                         i--;
2665                         while (i >= 0)
2666                                 platform_device_put(the_hcd_pdev[i--]);
2667                         return retval;
2668                 }
2669         }
2670         for (i = 0; i < mod_data.num; i++) {
2671                 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2672                 if (!the_udc_pdev[i]) {
2673                         i--;
2674                         while (i >= 0)
2675                                 platform_device_put(the_udc_pdev[i--]);
2676                         goto err_alloc_udc;
2677                 }
2678         }
2679         for (i = 0; i < mod_data.num; i++) {
2680                 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2681                 if (!dum[i])
2682                         goto err_add_pdata;
2683                 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2684                                 sizeof(void *));
2685                 if (retval)
2686                         goto err_add_pdata;
2687                 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2688                                 sizeof(void *));
2689                 if (retval)
2690                         goto err_add_pdata;
2691         }
2692
2693         retval = platform_driver_register(&dummy_hcd_driver);
2694         if (retval < 0)
2695                 goto err_add_pdata;
2696         retval = platform_driver_register(&dummy_udc_driver);
2697         if (retval < 0)
2698                 goto err_register_udc_driver;
2699
2700         for (i = 0; i < mod_data.num; i++) {
2701                 retval = platform_device_add(the_hcd_pdev[i]);
2702                 if (retval < 0) {
2703                         i--;
2704                         while (i >= 0)
2705                                 platform_device_del(the_hcd_pdev[i--]);
2706                         goto err_add_hcd;
2707                 }
2708         }
2709         for (i = 0; i < mod_data.num; i++) {
2710                 if (!dum[i]->hs_hcd ||
2711                                 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2712                         /*
2713                          * The hcd was added successfully but its probe
2714                          * function failed for some reason.
2715                          */
2716                         retval = -EINVAL;
2717                         goto err_add_udc;
2718                 }
2719         }
2720
2721         for (i = 0; i < mod_data.num; i++) {
2722                 retval = platform_device_add(the_udc_pdev[i]);
2723                 if (retval < 0) {
2724                         i--;
2725                         while (i >= 0)
2726                                 platform_device_del(the_udc_pdev[i]);
2727                         goto err_add_udc;
2728                 }
2729         }
2730
2731         for (i = 0; i < mod_data.num; i++) {
2732                 if (!platform_get_drvdata(the_udc_pdev[i])) {
2733                         /*
2734                          * The udc was added successfully but its probe
2735                          * function failed for some reason.
2736                          */
2737                         retval = -EINVAL;
2738                         goto err_probe_udc;
2739                 }
2740         }
2741         return retval;
2742
2743 err_probe_udc:
2744         for (i = 0; i < mod_data.num; i++)
2745                 platform_device_del(the_udc_pdev[i]);
2746 err_add_udc:
2747         for (i = 0; i < mod_data.num; i++)
2748                 platform_device_del(the_hcd_pdev[i]);
2749 err_add_hcd:
2750         platform_driver_unregister(&dummy_udc_driver);
2751 err_register_udc_driver:
2752         platform_driver_unregister(&dummy_hcd_driver);
2753 err_add_pdata:
2754         for (i = 0; i < mod_data.num; i++)
2755                 kfree(dum[i]);
2756         for (i = 0; i < mod_data.num; i++)
2757                 platform_device_put(the_udc_pdev[i]);
2758 err_alloc_udc:
2759         for (i = 0; i < mod_data.num; i++)
2760                 platform_device_put(the_hcd_pdev[i]);
2761         return retval;
2762 }
2763 module_init(init);
2764
2765 static void __exit cleanup(void)
2766 {
2767         int i;
2768
2769         for (i = 0; i < mod_data.num; i++) {
2770                 struct dummy *dum;
2771
2772                 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2773
2774                 platform_device_unregister(the_udc_pdev[i]);
2775                 platform_device_unregister(the_hcd_pdev[i]);
2776                 kfree(dum);
2777         }
2778         platform_driver_unregister(&dummy_udc_driver);
2779         platform_driver_unregister(&dummy_hcd_driver);
2780 }
2781 module_exit(cleanup);