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Linux/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 function_show(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_RO(function);
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         dev_dbg(udc_dev(dum), "binding gadget driver '%s'\n",
916                         driver->driver.name);
917         return 0;
918 }
919 
920 static int dummy_udc_stop(struct usb_gadget *g,
921                 struct usb_gadget_driver *driver)
922 {
923         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
924         struct dummy            *dum = dum_hcd->dum;
925 
926         if (driver)
927                 dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n",
928                                 driver->driver.name);
929 
930         dum->driver = NULL;
931 
932         return 0;
933 }
934 
935 #undef is_enabled
936 
937 /* The gadget structure is stored inside the hcd structure and will be
938  * released along with it. */
939 static void init_dummy_udc_hw(struct dummy *dum)
940 {
941         int i;
942 
943         INIT_LIST_HEAD(&dum->gadget.ep_list);
944         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
945                 struct dummy_ep *ep = &dum->ep[i];
946 
947                 if (!ep_name[i])
948                         break;
949                 ep->ep.name = ep_name[i];
950                 ep->ep.ops = &dummy_ep_ops;
951                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
952                 ep->halted = ep->wedged = ep->already_seen =
953                                 ep->setup_stage = 0;
954                 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
955                 ep->ep.max_streams = 16;
956                 ep->last_io = jiffies;
957                 ep->gadget = &dum->gadget;
958                 ep->desc = NULL;
959                 INIT_LIST_HEAD(&ep->queue);
960         }
961 
962         dum->gadget.ep0 = &dum->ep[0].ep;
963         list_del_init(&dum->ep[0].ep.ep_list);
964         INIT_LIST_HEAD(&dum->fifo_req.queue);
965 
966 #ifdef CONFIG_USB_OTG
967         dum->gadget.is_otg = 1;
968 #endif
969 }
970 
971 static int dummy_udc_probe(struct platform_device *pdev)
972 {
973         struct dummy    *dum;
974         int             rc;
975 
976         dum = *((void **)dev_get_platdata(&pdev->dev));
977         dum->gadget.name = gadget_name;
978         dum->gadget.ops = &dummy_ops;
979         dum->gadget.max_speed = USB_SPEED_SUPER;
980 
981         dum->gadget.dev.parent = &pdev->dev;
982         init_dummy_udc_hw(dum);
983 
984         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
985         if (rc < 0)
986                 goto err_udc;
987 
988         rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
989         if (rc < 0)
990                 goto err_dev;
991         platform_set_drvdata(pdev, dum);
992         return rc;
993 
994 err_dev:
995         usb_del_gadget_udc(&dum->gadget);
996 err_udc:
997         return rc;
998 }
999 
1000 static int dummy_udc_remove(struct platform_device *pdev)
1001 {
1002         struct dummy    *dum = platform_get_drvdata(pdev);
1003 
1004         device_remove_file(&dum->gadget.dev, &dev_attr_function);
1005         usb_del_gadget_udc(&dum->gadget);
1006         return 0;
1007 }
1008 
1009 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1010                 int suspend)
1011 {
1012         spin_lock_irq(&dum->lock);
1013         dum->udc_suspended = suspend;
1014         set_link_state(dum_hcd);
1015         spin_unlock_irq(&dum->lock);
1016 }
1017 
1018 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1019 {
1020         struct dummy            *dum = platform_get_drvdata(pdev);
1021         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1022 
1023         dev_dbg(&pdev->dev, "%s\n", __func__);
1024         dummy_udc_pm(dum, dum_hcd, 1);
1025         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1026         return 0;
1027 }
1028 
1029 static int dummy_udc_resume(struct platform_device *pdev)
1030 {
1031         struct dummy            *dum = platform_get_drvdata(pdev);
1032         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1033 
1034         dev_dbg(&pdev->dev, "%s\n", __func__);
1035         dummy_udc_pm(dum, dum_hcd, 0);
1036         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1037         return 0;
1038 }
1039 
1040 static struct platform_driver dummy_udc_driver = {
1041         .probe          = dummy_udc_probe,
1042         .remove         = dummy_udc_remove,
1043         .suspend        = dummy_udc_suspend,
1044         .resume         = dummy_udc_resume,
1045         .driver         = {
1046                 .name   = (char *) gadget_name,
1047                 .owner  = THIS_MODULE,
1048         },
1049 };
1050 
1051 /*-------------------------------------------------------------------------*/
1052 
1053 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1054 {
1055         unsigned int index;
1056 
1057         index = usb_endpoint_num(desc) << 1;
1058         if (usb_endpoint_dir_in(desc))
1059                 index |= 1;
1060         return index;
1061 }
1062 
1063 /* MASTER/HOST SIDE DRIVER
1064  *
1065  * this uses the hcd framework to hook up to host side drivers.
1066  * its root hub will only have one device, otherwise it acts like
1067  * a normal host controller.
1068  *
1069  * when urbs are queued, they're just stuck on a list that we
1070  * scan in a timer callback.  that callback connects writes from
1071  * the host with reads from the device, and so on, based on the
1072  * usb 2.0 rules.
1073  */
1074 
1075 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1076 {
1077         const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1078         u32 index;
1079 
1080         if (!usb_endpoint_xfer_bulk(desc))
1081                 return 0;
1082 
1083         index = dummy_get_ep_idx(desc);
1084         return (1 << index) & dum_hcd->stream_en_ep;
1085 }
1086 
1087 /*
1088  * The max stream number is saved as a nibble so for the 30 possible endpoints
1089  * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1090  * means we use only 1 stream). The maximum according to the spec is 16bit so
1091  * if the 16 stream limit is about to go, the array size should be incremented
1092  * to 30 elements of type u16.
1093  */
1094 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1095                 unsigned int pipe)
1096 {
1097         int max_streams;
1098 
1099         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1100         if (usb_pipeout(pipe))
1101                 max_streams >>= 4;
1102         else
1103                 max_streams &= 0xf;
1104         max_streams++;
1105         return max_streams;
1106 }
1107 
1108 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1109                 unsigned int pipe, unsigned int streams)
1110 {
1111         int max_streams;
1112 
1113         streams--;
1114         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1115         if (usb_pipeout(pipe)) {
1116                 streams <<= 4;
1117                 max_streams &= 0xf;
1118         } else {
1119                 max_streams &= 0xf0;
1120         }
1121         max_streams |= streams;
1122         dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1123 }
1124 
1125 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1126 {
1127         unsigned int max_streams;
1128         int enabled;
1129 
1130         enabled = dummy_ep_stream_en(dum_hcd, urb);
1131         if (!urb->stream_id) {
1132                 if (enabled)
1133                         return -EINVAL;
1134                 return 0;
1135         }
1136         if (!enabled)
1137                 return -EINVAL;
1138 
1139         max_streams = get_max_streams_for_pipe(dum_hcd,
1140                         usb_pipeendpoint(urb->pipe));
1141         if (urb->stream_id > max_streams) {
1142                 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1143                                 urb->stream_id);
1144                 BUG();
1145                 return -EINVAL;
1146         }
1147         return 0;
1148 }
1149 
1150 static int dummy_urb_enqueue(
1151         struct usb_hcd                  *hcd,
1152         struct urb                      *urb,
1153         gfp_t                           mem_flags
1154 ) {
1155         struct dummy_hcd *dum_hcd;
1156         struct urbp     *urbp;
1157         unsigned long   flags;
1158         int             rc;
1159 
1160         urbp = kmalloc(sizeof *urbp, mem_flags);
1161         if (!urbp)
1162                 return -ENOMEM;
1163         urbp->urb = urb;
1164         urbp->miter_started = 0;
1165 
1166         dum_hcd = hcd_to_dummy_hcd(hcd);
1167         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1168 
1169         rc = dummy_validate_stream(dum_hcd, urb);
1170         if (rc) {
1171                 kfree(urbp);
1172                 goto done;
1173         }
1174 
1175         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1176         if (rc) {
1177                 kfree(urbp);
1178                 goto done;
1179         }
1180 
1181         if (!dum_hcd->udev) {
1182                 dum_hcd->udev = urb->dev;
1183                 usb_get_dev(dum_hcd->udev);
1184         } else if (unlikely(dum_hcd->udev != urb->dev))
1185                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1186 
1187         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1188         urb->hcpriv = urbp;
1189         if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1190                 urb->error_count = 1;           /* mark as a new urb */
1191 
1192         /* kick the scheduler, it'll do the rest */
1193         if (!timer_pending(&dum_hcd->timer))
1194                 mod_timer(&dum_hcd->timer, jiffies + 1);
1195 
1196  done:
1197         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1198         return rc;
1199 }
1200 
1201 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1202 {
1203         struct dummy_hcd *dum_hcd;
1204         unsigned long   flags;
1205         int             rc;
1206 
1207         /* giveback happens automatically in timer callback,
1208          * so make sure the callback happens */
1209         dum_hcd = hcd_to_dummy_hcd(hcd);
1210         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1211 
1212         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1213         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1214                         !list_empty(&dum_hcd->urbp_list))
1215                 mod_timer(&dum_hcd->timer, jiffies);
1216 
1217         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1218         return rc;
1219 }
1220 
1221 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1222                 u32 len)
1223 {
1224         void *ubuf, *rbuf;
1225         struct urbp *urbp = urb->hcpriv;
1226         int to_host;
1227         struct sg_mapping_iter *miter = &urbp->miter;
1228         u32 trans = 0;
1229         u32 this_sg;
1230         bool next_sg;
1231 
1232         to_host = usb_pipein(urb->pipe);
1233         rbuf = req->req.buf + req->req.actual;
1234 
1235         if (!urb->num_sgs) {
1236                 ubuf = urb->transfer_buffer + urb->actual_length;
1237                 if (to_host)
1238                         memcpy(ubuf, rbuf, len);
1239                 else
1240                         memcpy(rbuf, ubuf, len);
1241                 return len;
1242         }
1243 
1244         if (!urbp->miter_started) {
1245                 u32 flags = SG_MITER_ATOMIC;
1246 
1247                 if (to_host)
1248                         flags |= SG_MITER_TO_SG;
1249                 else
1250                         flags |= SG_MITER_FROM_SG;
1251 
1252                 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1253                 urbp->miter_started = 1;
1254         }
1255         next_sg = sg_miter_next(miter);
1256         if (next_sg == false) {
1257                 WARN_ON_ONCE(1);
1258                 return -EINVAL;
1259         }
1260         do {
1261                 ubuf = miter->addr;
1262                 this_sg = min_t(u32, len, miter->length);
1263                 miter->consumed = this_sg;
1264                 trans += this_sg;
1265 
1266                 if (to_host)
1267                         memcpy(ubuf, rbuf, this_sg);
1268                 else
1269                         memcpy(rbuf, ubuf, this_sg);
1270                 len -= this_sg;
1271 
1272                 if (!len)
1273                         break;
1274                 next_sg = sg_miter_next(miter);
1275                 if (next_sg == false) {
1276                         WARN_ON_ONCE(1);
1277                         return -EINVAL;
1278                 }
1279 
1280                 rbuf += this_sg;
1281         } while (1);
1282 
1283         sg_miter_stop(miter);
1284         return trans;
1285 }
1286 
1287 /* transfer up to a frame's worth; caller must own lock */
1288 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1289                 struct dummy_ep *ep, int limit, int *status)
1290 {
1291         struct dummy            *dum = dum_hcd->dum;
1292         struct dummy_request    *req;
1293 
1294 top:
1295         /* if there's no request queued, the device is NAKing; return */
1296         list_for_each_entry(req, &ep->queue, queue) {
1297                 unsigned        host_len, dev_len, len;
1298                 int             is_short, to_host;
1299                 int             rescan = 0;
1300 
1301                 if (dummy_ep_stream_en(dum_hcd, urb)) {
1302                         if ((urb->stream_id != req->req.stream_id))
1303                                 continue;
1304                 }
1305 
1306                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1307                  * may be short (including zero length).
1308                  *
1309                  * writer can send a zlp explicitly (length 0) or implicitly
1310                  * (length mod maxpacket zero, and 'zero' flag); they always
1311                  * terminate reads.
1312                  */
1313                 host_len = urb->transfer_buffer_length - urb->actual_length;
1314                 dev_len = req->req.length - req->req.actual;
1315                 len = min(host_len, dev_len);
1316 
1317                 /* FIXME update emulated data toggle too */
1318 
1319                 to_host = usb_pipein(urb->pipe);
1320                 if (unlikely(len == 0))
1321                         is_short = 1;
1322                 else {
1323                         /* not enough bandwidth left? */
1324                         if (limit < ep->ep.maxpacket && limit < len)
1325                                 break;
1326                         len = min_t(unsigned, len, limit);
1327                         if (len == 0)
1328                                 break;
1329 
1330                         /* use an extra pass for the final short packet */
1331                         if (len > ep->ep.maxpacket) {
1332                                 rescan = 1;
1333                                 len -= (len % ep->ep.maxpacket);
1334                         }
1335                         is_short = (len % ep->ep.maxpacket) != 0;
1336 
1337                         len = dummy_perform_transfer(urb, req, len);
1338 
1339                         ep->last_io = jiffies;
1340                         if ((int)len < 0) {
1341                                 req->req.status = len;
1342                         } else {
1343                                 limit -= len;
1344                                 urb->actual_length += len;
1345                                 req->req.actual += len;
1346                         }
1347                 }
1348 
1349                 /* short packets terminate, maybe with overflow/underflow.
1350                  * it's only really an error to write too much.
1351                  *
1352                  * partially filling a buffer optionally blocks queue advances
1353                  * (so completion handlers can clean up the queue) but we don't
1354                  * need to emulate such data-in-flight.
1355                  */
1356                 if (is_short) {
1357                         if (host_len == dev_len) {
1358                                 req->req.status = 0;
1359                                 *status = 0;
1360                         } else if (to_host) {
1361                                 req->req.status = 0;
1362                                 if (dev_len > host_len)
1363                                         *status = -EOVERFLOW;
1364                                 else
1365                                         *status = 0;
1366                         } else if (!to_host) {
1367                                 *status = 0;
1368                                 if (host_len > dev_len)
1369                                         req->req.status = -EOVERFLOW;
1370                                 else
1371                                         req->req.status = 0;
1372                         }
1373 
1374                 /* many requests terminate without a short packet */
1375                 } else {
1376                         if (req->req.length == req->req.actual
1377                                         && !req->req.zero)
1378                                 req->req.status = 0;
1379                         if (urb->transfer_buffer_length == urb->actual_length
1380                                         && !(urb->transfer_flags
1381                                                 & URB_ZERO_PACKET))
1382                                 *status = 0;
1383                 }
1384 
1385                 /* device side completion --> continuable */
1386                 if (req->req.status != -EINPROGRESS) {
1387                         list_del_init(&req->queue);
1388 
1389                         spin_unlock(&dum->lock);
1390                         req->req.complete(&ep->ep, &req->req);
1391                         spin_lock(&dum->lock);
1392 
1393                         /* requests might have been unlinked... */
1394                         rescan = 1;
1395                 }
1396 
1397                 /* host side completion --> terminate */
1398                 if (*status != -EINPROGRESS)
1399                         break;
1400 
1401                 /* rescan to continue with any other queued i/o */
1402                 if (rescan)
1403                         goto top;
1404         }
1405         return limit;
1406 }
1407 
1408 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1409 {
1410         int     limit = ep->ep.maxpacket;
1411 
1412         if (dum->gadget.speed == USB_SPEED_HIGH) {
1413                 int     tmp;
1414 
1415                 /* high bandwidth mode */
1416                 tmp = usb_endpoint_maxp(ep->desc);
1417                 tmp = (tmp >> 11) & 0x03;
1418                 tmp *= 8 /* applies to entire frame */;
1419                 limit += limit * tmp;
1420         }
1421         if (dum->gadget.speed == USB_SPEED_SUPER) {
1422                 switch (usb_endpoint_type(ep->desc)) {
1423                 case USB_ENDPOINT_XFER_ISOC:
1424                         /* Sec. 4.4.8.2 USB3.0 Spec */
1425                         limit = 3 * 16 * 1024 * 8;
1426                         break;
1427                 case USB_ENDPOINT_XFER_INT:
1428                         /* Sec. 4.4.7.2 USB3.0 Spec */
1429                         limit = 3 * 1024 * 8;
1430                         break;
1431                 case USB_ENDPOINT_XFER_BULK:
1432                 default:
1433                         break;
1434                 }
1435         }
1436         return limit;
1437 }
1438 
1439 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1440                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1441                         USB_PORT_STAT_SUSPEND)) \
1442                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1443 
1444 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1445 {
1446         int             i;
1447 
1448         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1449                         dum->ss_hcd : dum->hs_hcd)))
1450                 return NULL;
1451         if ((address & ~USB_DIR_IN) == 0)
1452                 return &dum->ep[0];
1453         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1454                 struct dummy_ep *ep = &dum->ep[i];
1455 
1456                 if (!ep->desc)
1457                         continue;
1458                 if (ep->desc->bEndpointAddress == address)
1459                         return ep;
1460         }
1461         return NULL;
1462 }
1463 
1464 #undef is_active
1465 
1466 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1467 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1468 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1469 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1470 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1471 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1472 
1473 
1474 /**
1475  * handle_control_request() - handles all control transfers
1476  * @dum: pointer to dummy (the_controller)
1477  * @urb: the urb request to handle
1478  * @setup: pointer to the setup data for a USB device control
1479  *       request
1480  * @status: pointer to request handling status
1481  *
1482  * Return 0 - if the request was handled
1483  *        1 - if the request wasn't handles
1484  *        error code on error
1485  */
1486 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1487                                   struct usb_ctrlrequest *setup,
1488                                   int *status)
1489 {
1490         struct dummy_ep         *ep2;
1491         struct dummy            *dum = dum_hcd->dum;
1492         int                     ret_val = 1;
1493         unsigned        w_index;
1494         unsigned        w_value;
1495 
1496         w_index = le16_to_cpu(setup->wIndex);
1497         w_value = le16_to_cpu(setup->wValue);
1498         switch (setup->bRequest) {
1499         case USB_REQ_SET_ADDRESS:
1500                 if (setup->bRequestType != Dev_Request)
1501                         break;
1502                 dum->address = w_value;
1503                 *status = 0;
1504                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1505                                 w_value);
1506                 ret_val = 0;
1507                 break;
1508         case USB_REQ_SET_FEATURE:
1509                 if (setup->bRequestType == Dev_Request) {
1510                         ret_val = 0;
1511                         switch (w_value) {
1512                         case USB_DEVICE_REMOTE_WAKEUP:
1513                                 break;
1514                         case USB_DEVICE_B_HNP_ENABLE:
1515                                 dum->gadget.b_hnp_enable = 1;
1516                                 break;
1517                         case USB_DEVICE_A_HNP_SUPPORT:
1518                                 dum->gadget.a_hnp_support = 1;
1519                                 break;
1520                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1521                                 dum->gadget.a_alt_hnp_support = 1;
1522                                 break;
1523                         case USB_DEVICE_U1_ENABLE:
1524                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1525                                     HCD_USB3)
1526                                         w_value = USB_DEV_STAT_U1_ENABLED;
1527                                 else
1528                                         ret_val = -EOPNOTSUPP;
1529                                 break;
1530                         case USB_DEVICE_U2_ENABLE:
1531                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1532                                     HCD_USB3)
1533                                         w_value = USB_DEV_STAT_U2_ENABLED;
1534                                 else
1535                                         ret_val = -EOPNOTSUPP;
1536                                 break;
1537                         case USB_DEVICE_LTM_ENABLE:
1538                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1539                                     HCD_USB3)
1540                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1541                                 else
1542                                         ret_val = -EOPNOTSUPP;
1543                                 break;
1544                         default:
1545                                 ret_val = -EOPNOTSUPP;
1546                         }
1547                         if (ret_val == 0) {
1548                                 dum->devstatus |= (1 << w_value);
1549                                 *status = 0;
1550                         }
1551                 } else if (setup->bRequestType == Ep_Request) {
1552                         /* endpoint halt */
1553                         ep2 = find_endpoint(dum, w_index);
1554                         if (!ep2 || ep2->ep.name == ep0name) {
1555                                 ret_val = -EOPNOTSUPP;
1556                                 break;
1557                         }
1558                         ep2->halted = 1;
1559                         ret_val = 0;
1560                         *status = 0;
1561                 }
1562                 break;
1563         case USB_REQ_CLEAR_FEATURE:
1564                 if (setup->bRequestType == Dev_Request) {
1565                         ret_val = 0;
1566                         switch (w_value) {
1567                         case USB_DEVICE_REMOTE_WAKEUP:
1568                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1569                                 break;
1570                         case USB_DEVICE_U1_ENABLE:
1571                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1572                                     HCD_USB3)
1573                                         w_value = USB_DEV_STAT_U1_ENABLED;
1574                                 else
1575                                         ret_val = -EOPNOTSUPP;
1576                                 break;
1577                         case USB_DEVICE_U2_ENABLE:
1578                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1579                                     HCD_USB3)
1580                                         w_value = USB_DEV_STAT_U2_ENABLED;
1581                                 else
1582                                         ret_val = -EOPNOTSUPP;
1583                                 break;
1584                         case USB_DEVICE_LTM_ENABLE:
1585                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1586                                     HCD_USB3)
1587                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1588                                 else
1589                                         ret_val = -EOPNOTSUPP;
1590                                 break;
1591                         default:
1592                                 ret_val = -EOPNOTSUPP;
1593                                 break;
1594                         }
1595                         if (ret_val == 0) {
1596                                 dum->devstatus &= ~(1 << w_value);
1597                                 *status = 0;
1598                         }
1599                 } else if (setup->bRequestType == Ep_Request) {
1600                         /* endpoint halt */
1601                         ep2 = find_endpoint(dum, w_index);
1602                         if (!ep2) {
1603                                 ret_val = -EOPNOTSUPP;
1604                                 break;
1605                         }
1606                         if (!ep2->wedged)
1607                                 ep2->halted = 0;
1608                         ret_val = 0;
1609                         *status = 0;
1610                 }
1611                 break;
1612         case USB_REQ_GET_STATUS:
1613                 if (setup->bRequestType == Dev_InRequest
1614                                 || setup->bRequestType == Intf_InRequest
1615                                 || setup->bRequestType == Ep_InRequest) {
1616                         char *buf;
1617                         /*
1618                          * device: remote wakeup, selfpowered
1619                          * interface: nothing
1620                          * endpoint: halt
1621                          */
1622                         buf = (char *)urb->transfer_buffer;
1623                         if (urb->transfer_buffer_length > 0) {
1624                                 if (setup->bRequestType == Ep_InRequest) {
1625                                         ep2 = find_endpoint(dum, w_index);
1626                                         if (!ep2) {
1627                                                 ret_val = -EOPNOTSUPP;
1628                                                 break;
1629                                         }
1630                                         buf[0] = ep2->halted;
1631                                 } else if (setup->bRequestType ==
1632                                            Dev_InRequest) {
1633                                         buf[0] = (u8)dum->devstatus;
1634                                 } else
1635                                         buf[0] = 0;
1636                         }
1637                         if (urb->transfer_buffer_length > 1)
1638                                 buf[1] = 0;
1639                         urb->actual_length = min_t(u32, 2,
1640                                 urb->transfer_buffer_length);
1641                         ret_val = 0;
1642                         *status = 0;
1643                 }
1644                 break;
1645         }
1646         return ret_val;
1647 }
1648 
1649 /* drive both sides of the transfers; looks like irq handlers to
1650  * both drivers except the callbacks aren't in_irq().
1651  */
1652 static void dummy_timer(unsigned long _dum_hcd)
1653 {
1654         struct dummy_hcd        *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1655         struct dummy            *dum = dum_hcd->dum;
1656         struct urbp             *urbp, *tmp;
1657         unsigned long           flags;
1658         int                     limit, total;
1659         int                     i;
1660 
1661         /* simplistic model for one frame's bandwidth */
1662         switch (dum->gadget.speed) {
1663         case USB_SPEED_LOW:
1664                 total = 8/*bytes*/ * 12/*packets*/;
1665                 break;
1666         case USB_SPEED_FULL:
1667                 total = 64/*bytes*/ * 19/*packets*/;
1668                 break;
1669         case USB_SPEED_HIGH:
1670                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1671                 break;
1672         case USB_SPEED_SUPER:
1673                 /* Bus speed is 500000 bytes/ms, so use a little less */
1674                 total = 490000;
1675                 break;
1676         default:
1677                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1678                 return;
1679         }
1680 
1681         /* FIXME if HZ != 1000 this will probably misbehave ... */
1682 
1683         /* look at each urb queued by the host side driver */
1684         spin_lock_irqsave(&dum->lock, flags);
1685 
1686         if (!dum_hcd->udev) {
1687                 dev_err(dummy_dev(dum_hcd),
1688                                 "timer fired with no URBs pending?\n");
1689                 spin_unlock_irqrestore(&dum->lock, flags);
1690                 return;
1691         }
1692 
1693         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1694                 if (!ep_name[i])
1695                         break;
1696                 dum->ep[i].already_seen = 0;
1697         }
1698 
1699 restart:
1700         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1701                 struct urb              *urb;
1702                 struct dummy_request    *req;
1703                 u8                      address;
1704                 struct dummy_ep         *ep = NULL;
1705                 int                     type;
1706                 int                     status = -EINPROGRESS;
1707 
1708                 urb = urbp->urb;
1709                 if (urb->unlinked)
1710                         goto return_urb;
1711                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1712                         continue;
1713                 type = usb_pipetype(urb->pipe);
1714 
1715                 /* used up this frame's non-periodic bandwidth?
1716                  * FIXME there's infinite bandwidth for control and
1717                  * periodic transfers ... unrealistic.
1718                  */
1719                 if (total <= 0 && type == PIPE_BULK)
1720                         continue;
1721 
1722                 /* find the gadget's ep for this request (if configured) */
1723                 address = usb_pipeendpoint (urb->pipe);
1724                 if (usb_pipein(urb->pipe))
1725                         address |= USB_DIR_IN;
1726                 ep = find_endpoint(dum, address);
1727                 if (!ep) {
1728                         /* set_configuration() disagreement */
1729                         dev_dbg(dummy_dev(dum_hcd),
1730                                 "no ep configured for urb %p\n",
1731                                 urb);
1732                         status = -EPROTO;
1733                         goto return_urb;
1734                 }
1735 
1736                 if (ep->already_seen)
1737                         continue;
1738                 ep->already_seen = 1;
1739                 if (ep == &dum->ep[0] && urb->error_count) {
1740                         ep->setup_stage = 1;    /* a new urb */
1741                         urb->error_count = 0;
1742                 }
1743                 if (ep->halted && !ep->setup_stage) {
1744                         /* NOTE: must not be iso! */
1745                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1746                                         ep->ep.name, urb);
1747                         status = -EPIPE;
1748                         goto return_urb;
1749                 }
1750                 /* FIXME make sure both ends agree on maxpacket */
1751 
1752                 /* handle control requests */
1753                 if (ep == &dum->ep[0] && ep->setup_stage) {
1754                         struct usb_ctrlrequest          setup;
1755                         int                             value = 1;
1756 
1757                         setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1758                         /* paranoia, in case of stale queued data */
1759                         list_for_each_entry(req, &ep->queue, queue) {
1760                                 list_del_init(&req->queue);
1761                                 req->req.status = -EOVERFLOW;
1762                                 dev_dbg(udc_dev(dum), "stale req = %p\n",
1763                                                 req);
1764 
1765                                 spin_unlock(&dum->lock);
1766                                 req->req.complete(&ep->ep, &req->req);
1767                                 spin_lock(&dum->lock);
1768                                 ep->already_seen = 0;
1769                                 goto restart;
1770                         }
1771 
1772                         /* gadget driver never sees set_address or operations
1773                          * on standard feature flags.  some hardware doesn't
1774                          * even expose them.
1775                          */
1776                         ep->last_io = jiffies;
1777                         ep->setup_stage = 0;
1778                         ep->halted = 0;
1779 
1780                         value = handle_control_request(dum_hcd, urb, &setup,
1781                                                        &status);
1782 
1783                         /* gadget driver handles all other requests.  block
1784                          * until setup() returns; no reentrancy issues etc.
1785                          */
1786                         if (value > 0) {
1787                                 spin_unlock(&dum->lock);
1788                                 value = dum->driver->setup(&dum->gadget,
1789                                                 &setup);
1790                                 spin_lock(&dum->lock);
1791 
1792                                 if (value >= 0) {
1793                                         /* no delays (max 64KB data stage) */
1794                                         limit = 64*1024;
1795                                         goto treat_control_like_bulk;
1796                                 }
1797                                 /* error, see below */
1798                         }
1799 
1800                         if (value < 0) {
1801                                 if (value != -EOPNOTSUPP)
1802                                         dev_dbg(udc_dev(dum),
1803                                                 "setup --> %d\n",
1804                                                 value);
1805                                 status = -EPIPE;
1806                                 urb->actual_length = 0;
1807                         }
1808 
1809                         goto return_urb;
1810                 }
1811 
1812                 /* non-control requests */
1813                 limit = total;
1814                 switch (usb_pipetype(urb->pipe)) {
1815                 case PIPE_ISOCHRONOUS:
1816                         /* FIXME is it urb->interval since the last xfer?
1817                          * use urb->iso_frame_desc[i].
1818                          * complete whether or not ep has requests queued.
1819                          * report random errors, to debug drivers.
1820                          */
1821                         limit = max(limit, periodic_bytes(dum, ep));
1822                         status = -ENOSYS;
1823                         break;
1824 
1825                 case PIPE_INTERRUPT:
1826                         /* FIXME is it urb->interval since the last xfer?
1827                          * this almost certainly polls too fast.
1828                          */
1829                         limit = max(limit, periodic_bytes(dum, ep));
1830                         /* FALLTHROUGH */
1831 
1832                 default:
1833 treat_control_like_bulk:
1834                         ep->last_io = jiffies;
1835                         total = transfer(dum_hcd, urb, ep, limit, &status);
1836                         break;
1837                 }
1838 
1839                 /* incomplete transfer? */
1840                 if (status == -EINPROGRESS)
1841                         continue;
1842 
1843 return_urb:
1844                 list_del(&urbp->urbp_list);
1845                 kfree(urbp);
1846                 if (ep)
1847                         ep->already_seen = ep->setup_stage = 0;
1848 
1849                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1850                 spin_unlock(&dum->lock);
1851                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1852                 spin_lock(&dum->lock);
1853 
1854                 goto restart;
1855         }
1856 
1857         if (list_empty(&dum_hcd->urbp_list)) {
1858                 usb_put_dev(dum_hcd->udev);
1859                 dum_hcd->udev = NULL;
1860         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1861                 /* want a 1 msec delay here */
1862                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1863         }
1864 
1865         spin_unlock_irqrestore(&dum->lock, flags);
1866 }
1867 
1868 /*-------------------------------------------------------------------------*/
1869 
1870 #define PORT_C_MASK \
1871         ((USB_PORT_STAT_C_CONNECTION \
1872         | USB_PORT_STAT_C_ENABLE \
1873         | USB_PORT_STAT_C_SUSPEND \
1874         | USB_PORT_STAT_C_OVERCURRENT \
1875         | USB_PORT_STAT_C_RESET) << 16)
1876 
1877 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1878 {
1879         struct dummy_hcd        *dum_hcd;
1880         unsigned long           flags;
1881         int                     retval = 0;
1882 
1883         dum_hcd = hcd_to_dummy_hcd(hcd);
1884 
1885         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1886         if (!HCD_HW_ACCESSIBLE(hcd))
1887                 goto done;
1888 
1889         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1890                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1891                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1892                 set_link_state(dum_hcd);
1893         }
1894 
1895         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1896                 *buf = (1 << 1);
1897                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1898                                 dum_hcd->port_status);
1899                 retval = 1;
1900                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1901                         usb_hcd_resume_root_hub(hcd);
1902         }
1903 done:
1904         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1905         return retval;
1906 }
1907 
1908 /* usb 3.0 root hub device descriptor */
1909 static struct {
1910         struct usb_bos_descriptor bos;
1911         struct usb_ss_cap_descriptor ss_cap;
1912 } __packed usb3_bos_desc = {
1913 
1914         .bos = {
1915                 .bLength                = USB_DT_BOS_SIZE,
1916                 .bDescriptorType        = USB_DT_BOS,
1917                 .wTotalLength           = cpu_to_le16(sizeof(usb3_bos_desc)),
1918                 .bNumDeviceCaps         = 1,
1919         },
1920         .ss_cap = {
1921                 .bLength                = USB_DT_USB_SS_CAP_SIZE,
1922                 .bDescriptorType        = USB_DT_DEVICE_CAPABILITY,
1923                 .bDevCapabilityType     = USB_SS_CAP_TYPE,
1924                 .wSpeedSupported        = cpu_to_le16(USB_5GBPS_OPERATION),
1925                 .bFunctionalitySupport  = ilog2(USB_5GBPS_OPERATION),
1926         },
1927 };
1928 
1929 static inline void
1930 ss_hub_descriptor(struct usb_hub_descriptor *desc)
1931 {
1932         memset(desc, 0, sizeof *desc);
1933         desc->bDescriptorType = 0x2a;
1934         desc->bDescLength = 12;
1935         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1936         desc->bNbrPorts = 1;
1937         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
1938         desc->u.ss.DeviceRemovable = 0xffff;
1939 }
1940 
1941 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
1942 {
1943         memset(desc, 0, sizeof *desc);
1944         desc->bDescriptorType = 0x29;
1945         desc->bDescLength = 9;
1946         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1947         desc->bNbrPorts = 1;
1948         desc->u.hs.DeviceRemovable[0] = 0xff;
1949         desc->u.hs.DeviceRemovable[1] = 0xff;
1950 }
1951 
1952 static int dummy_hub_control(
1953         struct usb_hcd  *hcd,
1954         u16             typeReq,
1955         u16             wValue,
1956         u16             wIndex,
1957         char            *buf,
1958         u16             wLength
1959 ) {
1960         struct dummy_hcd *dum_hcd;
1961         int             retval = 0;
1962         unsigned long   flags;
1963 
1964         if (!HCD_HW_ACCESSIBLE(hcd))
1965                 return -ETIMEDOUT;
1966 
1967         dum_hcd = hcd_to_dummy_hcd(hcd);
1968 
1969         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1970         switch (typeReq) {
1971         case ClearHubFeature:
1972                 break;
1973         case ClearPortFeature:
1974                 switch (wValue) {
1975                 case USB_PORT_FEAT_SUSPEND:
1976                         if (hcd->speed == HCD_USB3) {
1977                                 dev_dbg(dummy_dev(dum_hcd),
1978                                          "USB_PORT_FEAT_SUSPEND req not "
1979                                          "supported for USB 3.0 roothub\n");
1980                                 goto error;
1981                         }
1982                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
1983                                 /* 20msec resume signaling */
1984                                 dum_hcd->resuming = 1;
1985                                 dum_hcd->re_timeout = jiffies +
1986                                                 msecs_to_jiffies(20);
1987                         }
1988                         break;
1989                 case USB_PORT_FEAT_POWER:
1990                         if (hcd->speed == HCD_USB3) {
1991                                 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
1992                                         dev_dbg(dummy_dev(dum_hcd),
1993                                                 "power-off\n");
1994                         } else
1995                                 if (dum_hcd->port_status &
1996                                                         USB_SS_PORT_STAT_POWER)
1997                                         dev_dbg(dummy_dev(dum_hcd),
1998                                                 "power-off\n");
1999                         /* FALLS THROUGH */
2000                 default:
2001                         dum_hcd->port_status &= ~(1 << wValue);
2002                         set_link_state(dum_hcd);
2003                 }
2004                 break;
2005         case GetHubDescriptor:
2006                 if (hcd->speed == HCD_USB3 &&
2007                                 (wLength < USB_DT_SS_HUB_SIZE ||
2008                                  wValue != (USB_DT_SS_HUB << 8))) {
2009                         dev_dbg(dummy_dev(dum_hcd),
2010                                 "Wrong hub descriptor type for "
2011                                 "USB 3.0 roothub.\n");
2012                         goto error;
2013                 }
2014                 if (hcd->speed == HCD_USB3)
2015                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2016                 else
2017                         hub_descriptor((struct usb_hub_descriptor *) buf);
2018                 break;
2019 
2020         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2021                 if (hcd->speed != HCD_USB3)
2022                         goto error;
2023 
2024                 if ((wValue >> 8) != USB_DT_BOS)
2025                         goto error;
2026 
2027                 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2028                 retval = sizeof(usb3_bos_desc);
2029                 break;
2030 
2031         case GetHubStatus:
2032                 *(__le32 *) buf = cpu_to_le32(0);
2033                 break;
2034         case GetPortStatus:
2035                 if (wIndex != 1)
2036                         retval = -EPIPE;
2037 
2038                 /* whoever resets or resumes must GetPortStatus to
2039                  * complete it!!
2040                  */
2041                 if (dum_hcd->resuming &&
2042                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2043                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2044                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2045                 }
2046                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2047                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2048                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2049                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2050                         if (dum_hcd->dum->pullup) {
2051                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2052 
2053                                 if (hcd->speed < HCD_USB3) {
2054                                         switch (dum_hcd->dum->gadget.speed) {
2055                                         case USB_SPEED_HIGH:
2056                                                 dum_hcd->port_status |=
2057                                                       USB_PORT_STAT_HIGH_SPEED;
2058                                                 break;
2059                                         case USB_SPEED_LOW:
2060                                                 dum_hcd->dum->gadget.ep0->
2061                                                         maxpacket = 8;
2062                                                 dum_hcd->port_status |=
2063                                                         USB_PORT_STAT_LOW_SPEED;
2064                                                 break;
2065                                         default:
2066                                                 dum_hcd->dum->gadget.speed =
2067                                                         USB_SPEED_FULL;
2068                                                 break;
2069                                         }
2070                                 }
2071                         }
2072                 }
2073                 set_link_state(dum_hcd);
2074                 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2075                 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2076                 break;
2077         case SetHubFeature:
2078                 retval = -EPIPE;
2079                 break;
2080         case SetPortFeature:
2081                 switch (wValue) {
2082                 case USB_PORT_FEAT_LINK_STATE:
2083                         if (hcd->speed != HCD_USB3) {
2084                                 dev_dbg(dummy_dev(dum_hcd),
2085                                          "USB_PORT_FEAT_LINK_STATE req not "
2086                                          "supported for USB 2.0 roothub\n");
2087                                 goto error;
2088                         }
2089                         /*
2090                          * Since this is dummy we don't have an actual link so
2091                          * there is nothing to do for the SET_LINK_STATE cmd
2092                          */
2093                         break;
2094                 case USB_PORT_FEAT_U1_TIMEOUT:
2095                 case USB_PORT_FEAT_U2_TIMEOUT:
2096                         /* TODO: add suspend/resume support! */
2097                         if (hcd->speed != HCD_USB3) {
2098                                 dev_dbg(dummy_dev(dum_hcd),
2099                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2100                                          "supported for USB 2.0 roothub\n");
2101                                 goto error;
2102                         }
2103                         break;
2104                 case USB_PORT_FEAT_SUSPEND:
2105                         /* Applicable only for USB2.0 hub */
2106                         if (hcd->speed == HCD_USB3) {
2107                                 dev_dbg(dummy_dev(dum_hcd),
2108                                          "USB_PORT_FEAT_SUSPEND req not "
2109                                          "supported for USB 3.0 roothub\n");
2110                                 goto error;
2111                         }
2112                         if (dum_hcd->active) {
2113                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2114 
2115                                 /* HNP would happen here; for now we
2116                                  * assume b_bus_req is always true.
2117                                  */
2118                                 set_link_state(dum_hcd);
2119                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2120                                                 & dum_hcd->dum->devstatus) != 0)
2121                                         dev_dbg(dummy_dev(dum_hcd),
2122                                                         "no HNP yet!\n");
2123                         }
2124                         break;
2125                 case USB_PORT_FEAT_POWER:
2126                         if (hcd->speed == HCD_USB3)
2127                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2128                         else
2129                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2130                         set_link_state(dum_hcd);
2131                         break;
2132                 case USB_PORT_FEAT_BH_PORT_RESET:
2133                         /* Applicable only for USB3.0 hub */
2134                         if (hcd->speed != HCD_USB3) {
2135                                 dev_dbg(dummy_dev(dum_hcd),
2136                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
2137                                          "supported for USB 2.0 roothub\n");
2138                                 goto error;
2139                         }
2140                         /* FALLS THROUGH */
2141                 case USB_PORT_FEAT_RESET:
2142                         /* if it's already enabled, disable */
2143                         if (hcd->speed == HCD_USB3) {
2144                                 dum_hcd->port_status = 0;
2145                                 dum_hcd->port_status =
2146                                         (USB_SS_PORT_STAT_POWER |
2147                                          USB_PORT_STAT_CONNECTION |
2148                                          USB_PORT_STAT_RESET);
2149                         } else
2150                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2151                                         | USB_PORT_STAT_LOW_SPEED
2152                                         | USB_PORT_STAT_HIGH_SPEED);
2153                         /*
2154                          * We want to reset device status. All but the
2155                          * Self powered feature
2156                          */
2157                         dum_hcd->dum->devstatus &=
2158                                 (1 << USB_DEVICE_SELF_POWERED);
2159                         /*
2160                          * FIXME USB3.0: what is the correct reset signaling
2161                          * interval? Is it still 50msec as for HS?
2162                          */
2163                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2164                         /* FALLS THROUGH */
2165                 default:
2166                         if (hcd->speed == HCD_USB3) {
2167                                 if ((dum_hcd->port_status &
2168                                      USB_SS_PORT_STAT_POWER) != 0) {
2169                                         dum_hcd->port_status |= (1 << wValue);
2170                                         set_link_state(dum_hcd);
2171                                 }
2172                         } else
2173                                 if ((dum_hcd->port_status &
2174                                      USB_PORT_STAT_POWER) != 0) {
2175                                         dum_hcd->port_status |= (1 << wValue);
2176                                         set_link_state(dum_hcd);
2177                                 }
2178                 }
2179                 break;
2180         case GetPortErrorCount:
2181                 if (hcd->speed != HCD_USB3) {
2182                         dev_dbg(dummy_dev(dum_hcd),
2183                                  "GetPortErrorCount req not "
2184                                  "supported for USB 2.0 roothub\n");
2185                         goto error;
2186                 }
2187                 /* We'll always return 0 since this is a dummy hub */
2188                 *(__le32 *) buf = cpu_to_le32(0);
2189                 break;
2190         case SetHubDepth:
2191                 if (hcd->speed != HCD_USB3) {
2192                         dev_dbg(dummy_dev(dum_hcd),
2193                                  "SetHubDepth req not supported for "
2194                                  "USB 2.0 roothub\n");
2195                         goto error;
2196                 }
2197                 break;
2198         default:
2199                 dev_dbg(dummy_dev(dum_hcd),
2200                         "hub control req%04x v%04x i%04x l%d\n",
2201                         typeReq, wValue, wIndex, wLength);
2202 error:
2203                 /* "protocol stall" on error */
2204                 retval = -EPIPE;
2205         }
2206         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2207 
2208         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2209                 usb_hcd_poll_rh_status(hcd);
2210         return retval;
2211 }
2212 
2213 static int dummy_bus_suspend(struct usb_hcd *hcd)
2214 {
2215         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2216 
2217         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2218 
2219         spin_lock_irq(&dum_hcd->dum->lock);
2220         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2221         set_link_state(dum_hcd);
2222         hcd->state = HC_STATE_SUSPENDED;
2223         spin_unlock_irq(&dum_hcd->dum->lock);
2224         return 0;
2225 }
2226 
2227 static int dummy_bus_resume(struct usb_hcd *hcd)
2228 {
2229         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2230         int rc = 0;
2231 
2232         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2233 
2234         spin_lock_irq(&dum_hcd->dum->lock);
2235         if (!HCD_HW_ACCESSIBLE(hcd)) {
2236                 rc = -ESHUTDOWN;
2237         } else {
2238                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2239                 set_link_state(dum_hcd);
2240                 if (!list_empty(&dum_hcd->urbp_list))
2241                         mod_timer(&dum_hcd->timer, jiffies);
2242                 hcd->state = HC_STATE_RUNNING;
2243         }
2244         spin_unlock_irq(&dum_hcd->dum->lock);
2245         return rc;
2246 }
2247 
2248 /*-------------------------------------------------------------------------*/
2249 
2250 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2251 {
2252         int ep = usb_pipeendpoint(urb->pipe);
2253 
2254         return snprintf(buf, size,
2255                 "urb/%p %s ep%d%s%s len %d/%d\n",
2256                 urb,
2257                 ({ char *s;
2258                 switch (urb->dev->speed) {
2259                 case USB_SPEED_LOW:
2260                         s = "ls";
2261                         break;
2262                 case USB_SPEED_FULL:
2263                         s = "fs";
2264                         break;
2265                 case USB_SPEED_HIGH:
2266                         s = "hs";
2267                         break;
2268                 case USB_SPEED_SUPER:
2269                         s = "ss";
2270                         break;
2271                 default:
2272                         s = "?";
2273                         break;
2274                  } s; }),
2275                 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2276                 ({ char *s; \
2277                 switch (usb_pipetype(urb->pipe)) { \
2278                 case PIPE_CONTROL: \
2279                         s = ""; \
2280                         break; \
2281                 case PIPE_BULK: \
2282                         s = "-bulk"; \
2283                         break; \
2284                 case PIPE_INTERRUPT: \
2285                         s = "-int"; \
2286                         break; \
2287                 default: \
2288                         s = "-iso"; \
2289                         break; \
2290                 } s; }),
2291                 urb->actual_length, urb->transfer_buffer_length);
2292 }
2293 
2294 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2295                 char *buf)
2296 {
2297         struct usb_hcd          *hcd = dev_get_drvdata(dev);
2298         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2299         struct urbp             *urbp;
2300         size_t                  size = 0;
2301         unsigned long           flags;
2302 
2303         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2304         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2305                 size_t          temp;
2306 
2307                 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2308                 buf += temp;
2309                 size += temp;
2310         }
2311         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2312 
2313         return size;
2314 }
2315 static DEVICE_ATTR_RO(urbs);
2316 
2317 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2318 {
2319         init_timer(&dum_hcd->timer);
2320         dum_hcd->timer.function = dummy_timer;
2321         dum_hcd->timer.data = (unsigned long)dum_hcd;
2322         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2323         dum_hcd->stream_en_ep = 0;
2324         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2325         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2326         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2327         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2328 #ifdef CONFIG_USB_OTG
2329         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2330 #endif
2331         return 0;
2332 
2333         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2334         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2335 }
2336 
2337 static int dummy_start(struct usb_hcd *hcd)
2338 {
2339         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2340 
2341         /*
2342          * MASTER side init ... we emulate a root hub that'll only ever
2343          * talk to one device (the slave side).  Also appears in sysfs,
2344          * just like more familiar pci-based HCDs.
2345          */
2346         if (!usb_hcd_is_primary_hcd(hcd))
2347                 return dummy_start_ss(dum_hcd);
2348 
2349         spin_lock_init(&dum_hcd->dum->lock);
2350         init_timer(&dum_hcd->timer);
2351         dum_hcd->timer.function = dummy_timer;
2352         dum_hcd->timer.data = (unsigned long)dum_hcd;
2353         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2354 
2355         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2356 
2357         hcd->power_budget = POWER_BUDGET;
2358         hcd->state = HC_STATE_RUNNING;
2359         hcd->uses_new_polling = 1;
2360 
2361 #ifdef CONFIG_USB_OTG
2362         hcd->self.otg_port = 1;
2363 #endif
2364 
2365         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2366         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2367 }
2368 
2369 static void dummy_stop(struct usb_hcd *hcd)
2370 {
2371         struct dummy            *dum;
2372 
2373         dum = hcd_to_dummy_hcd(hcd)->dum;
2374         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2375         usb_gadget_unregister_driver(dum->driver);
2376         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2377 }
2378 
2379 /*-------------------------------------------------------------------------*/
2380 
2381 static int dummy_h_get_frame(struct usb_hcd *hcd)
2382 {
2383         return dummy_g_get_frame(NULL);
2384 }
2385 
2386 static int dummy_setup(struct usb_hcd *hcd)
2387 {
2388         struct dummy *dum;
2389 
2390         dum = *((void **)dev_get_platdata(hcd->self.controller));
2391         hcd->self.sg_tablesize = ~0;
2392         if (usb_hcd_is_primary_hcd(hcd)) {
2393                 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2394                 dum->hs_hcd->dum = dum;
2395                 /*
2396                  * Mark the first roothub as being USB 2.0.
2397                  * The USB 3.0 roothub will be registered later by
2398                  * dummy_hcd_probe()
2399                  */
2400                 hcd->speed = HCD_USB2;
2401                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2402         } else {
2403                 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2404                 dum->ss_hcd->dum = dum;
2405                 hcd->speed = HCD_USB3;
2406                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2407         }
2408         return 0;
2409 }
2410 
2411 /* Change a group of bulk endpoints to support multiple stream IDs */
2412 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2413         struct usb_host_endpoint **eps, unsigned int num_eps,
2414         unsigned int num_streams, gfp_t mem_flags)
2415 {
2416         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2417         unsigned long flags;
2418         int max_stream;
2419         int ret_streams = num_streams;
2420         unsigned int index;
2421         unsigned int i;
2422 
2423         if (!num_eps)
2424                 return -EINVAL;
2425 
2426         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2427         for (i = 0; i < num_eps; i++) {
2428                 index = dummy_get_ep_idx(&eps[i]->desc);
2429                 if ((1 << index) & dum_hcd->stream_en_ep) {
2430                         ret_streams = -EINVAL;
2431                         goto out;
2432                 }
2433                 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2434                 if (!max_stream) {
2435                         ret_streams = -EINVAL;
2436                         goto out;
2437                 }
2438                 if (max_stream < ret_streams) {
2439                         dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2440                                         "stream IDs.\n",
2441                                         eps[i]->desc.bEndpointAddress,
2442                                         max_stream);
2443                         ret_streams = max_stream;
2444                 }
2445         }
2446 
2447         for (i = 0; i < num_eps; i++) {
2448                 index = dummy_get_ep_idx(&eps[i]->desc);
2449                 dum_hcd->stream_en_ep |= 1 << index;
2450                 set_max_streams_for_pipe(dum_hcd,
2451                                 usb_endpoint_num(&eps[i]->desc), ret_streams);
2452         }
2453 out:
2454         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2455         return ret_streams;
2456 }
2457 
2458 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2459 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2460         struct usb_host_endpoint **eps, unsigned int num_eps,
2461         gfp_t mem_flags)
2462 {
2463         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2464         unsigned long flags;
2465         int ret;
2466         unsigned int index;
2467         unsigned int i;
2468 
2469         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2470         for (i = 0; i < num_eps; i++) {
2471                 index = dummy_get_ep_idx(&eps[i]->desc);
2472                 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2473                         ret = -EINVAL;
2474                         goto out;
2475                 }
2476         }
2477 
2478         for (i = 0; i < num_eps; i++) {
2479                 index = dummy_get_ep_idx(&eps[i]->desc);
2480                 dum_hcd->stream_en_ep &= ~(1 << index);
2481                 set_max_streams_for_pipe(dum_hcd,
2482                                 usb_endpoint_num(&eps[i]->desc), 0);
2483         }
2484         ret = 0;
2485 out:
2486         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2487         return ret;
2488 }
2489 
2490 static struct hc_driver dummy_hcd = {
2491         .description =          (char *) driver_name,
2492         .product_desc =         "Dummy host controller",
2493         .hcd_priv_size =        sizeof(struct dummy_hcd),
2494 
2495         .flags =                HCD_USB3 | HCD_SHARED,
2496 
2497         .reset =                dummy_setup,
2498         .start =                dummy_start,
2499         .stop =                 dummy_stop,
2500 
2501         .urb_enqueue =          dummy_urb_enqueue,
2502         .urb_dequeue =          dummy_urb_dequeue,
2503 
2504         .get_frame_number =     dummy_h_get_frame,
2505 
2506         .hub_status_data =      dummy_hub_status,
2507         .hub_control =          dummy_hub_control,
2508         .bus_suspend =          dummy_bus_suspend,
2509         .bus_resume =           dummy_bus_resume,
2510 
2511         .alloc_streams =        dummy_alloc_streams,
2512         .free_streams =         dummy_free_streams,
2513 };
2514 
2515 static int dummy_hcd_probe(struct platform_device *pdev)
2516 {
2517         struct dummy            *dum;
2518         struct usb_hcd          *hs_hcd;
2519         struct usb_hcd          *ss_hcd;
2520         int                     retval;
2521 
2522         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2523         dum = *((void **)dev_get_platdata(&pdev->dev));
2524 
2525         if (!mod_data.is_super_speed)
2526                 dummy_hcd.flags = HCD_USB2;
2527         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2528         if (!hs_hcd)
2529                 return -ENOMEM;
2530         hs_hcd->has_tt = 1;
2531 
2532         retval = usb_add_hcd(hs_hcd, 0, 0);
2533         if (retval)
2534                 goto put_usb2_hcd;
2535 
2536         if (mod_data.is_super_speed) {
2537                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2538                                         dev_name(&pdev->dev), hs_hcd);
2539                 if (!ss_hcd) {
2540                         retval = -ENOMEM;
2541                         goto dealloc_usb2_hcd;
2542                 }
2543 
2544                 retval = usb_add_hcd(ss_hcd, 0, 0);
2545                 if (retval)
2546                         goto put_usb3_hcd;
2547         }
2548         return 0;
2549 
2550 put_usb3_hcd:
2551         usb_put_hcd(ss_hcd);
2552 dealloc_usb2_hcd:
2553         usb_remove_hcd(hs_hcd);
2554 put_usb2_hcd:
2555         usb_put_hcd(hs_hcd);
2556         dum->hs_hcd = dum->ss_hcd = NULL;
2557         return retval;
2558 }
2559 
2560 static int dummy_hcd_remove(struct platform_device *pdev)
2561 {
2562         struct dummy            *dum;
2563 
2564         dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2565 
2566         if (dum->ss_hcd) {
2567                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2568                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2569         }
2570 
2571         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2572         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2573 
2574         dum->hs_hcd = NULL;
2575         dum->ss_hcd = NULL;
2576 
2577         return 0;
2578 }
2579 
2580 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2581 {
2582         struct usb_hcd          *hcd;
2583         struct dummy_hcd        *dum_hcd;
2584         int                     rc = 0;
2585 
2586         dev_dbg(&pdev->dev, "%s\n", __func__);
2587 
2588         hcd = platform_get_drvdata(pdev);
2589         dum_hcd = hcd_to_dummy_hcd(hcd);
2590         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2591                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2592                 rc = -EBUSY;
2593         } else
2594                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2595         return rc;
2596 }
2597 
2598 static int dummy_hcd_resume(struct platform_device *pdev)
2599 {
2600         struct usb_hcd          *hcd;
2601 
2602         dev_dbg(&pdev->dev, "%s\n", __func__);
2603 
2604         hcd = platform_get_drvdata(pdev);
2605         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2606         usb_hcd_poll_rh_status(hcd);
2607         return 0;
2608 }
2609 
2610 static struct platform_driver dummy_hcd_driver = {
2611         .probe          = dummy_hcd_probe,
2612         .remove         = dummy_hcd_remove,
2613         .suspend        = dummy_hcd_suspend,
2614         .resume         = dummy_hcd_resume,
2615         .driver         = {
2616                 .name   = (char *) driver_name,
2617                 .owner  = THIS_MODULE,
2618         },
2619 };
2620 
2621 /*-------------------------------------------------------------------------*/
2622 #define MAX_NUM_UDC     2
2623 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2624 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2625 
2626 static int __init init(void)
2627 {
2628         int     retval = -ENOMEM;
2629         int     i;
2630         struct  dummy *dum[MAX_NUM_UDC];
2631 
2632         if (usb_disabled())
2633                 return -ENODEV;
2634 
2635         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2636                 return -EINVAL;
2637 
2638         if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2639                 pr_err("Number of emulated UDC must be in range of 1…%d\n",
2640                                 MAX_NUM_UDC);
2641                 return -EINVAL;
2642         }
2643 
2644         for (i = 0; i < mod_data.num; i++) {
2645                 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2646                 if (!the_hcd_pdev[i]) {
2647                         i--;
2648                         while (i >= 0)
2649                                 platform_device_put(the_hcd_pdev[i--]);
2650                         return retval;
2651                 }
2652         }
2653         for (i = 0; i < mod_data.num; i++) {
2654                 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2655                 if (!the_udc_pdev[i]) {
2656                         i--;
2657                         while (i >= 0)
2658                                 platform_device_put(the_udc_pdev[i--]);
2659                         goto err_alloc_udc;
2660                 }
2661         }
2662         for (i = 0; i < mod_data.num; i++) {
2663                 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2664                 if (!dum[i]) {
2665                         retval = -ENOMEM;
2666                         goto err_add_pdata;
2667                 }
2668                 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2669                                 sizeof(void *));
2670                 if (retval)
2671                         goto err_add_pdata;
2672                 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2673                                 sizeof(void *));
2674                 if (retval)
2675                         goto err_add_pdata;
2676         }
2677 
2678         retval = platform_driver_register(&dummy_hcd_driver);
2679         if (retval < 0)
2680                 goto err_add_pdata;
2681         retval = platform_driver_register(&dummy_udc_driver);
2682         if (retval < 0)
2683                 goto err_register_udc_driver;
2684 
2685         for (i = 0; i < mod_data.num; i++) {
2686                 retval = platform_device_add(the_hcd_pdev[i]);
2687                 if (retval < 0) {
2688                         i--;
2689                         while (i >= 0)
2690                                 platform_device_del(the_hcd_pdev[i--]);
2691                         goto err_add_hcd;
2692                 }
2693         }
2694         for (i = 0; i < mod_data.num; i++) {
2695                 if (!dum[i]->hs_hcd ||
2696                                 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2697                         /*
2698                          * The hcd was added successfully but its probe
2699                          * function failed for some reason.
2700                          */
2701                         retval = -EINVAL;
2702                         goto err_add_udc;
2703                 }
2704         }
2705 
2706         for (i = 0; i < mod_data.num; i++) {
2707                 retval = platform_device_add(the_udc_pdev[i]);
2708                 if (retval < 0) {
2709                         i--;
2710                         while (i >= 0)
2711                                 platform_device_del(the_udc_pdev[i]);
2712                         goto err_add_udc;
2713                 }
2714         }
2715 
2716         for (i = 0; i < mod_data.num; i++) {
2717                 if (!platform_get_drvdata(the_udc_pdev[i])) {
2718                         /*
2719                          * The udc was added successfully but its probe
2720                          * function failed for some reason.
2721                          */
2722                         retval = -EINVAL;
2723                         goto err_probe_udc;
2724                 }
2725         }
2726         return retval;
2727 
2728 err_probe_udc:
2729         for (i = 0; i < mod_data.num; i++)
2730                 platform_device_del(the_udc_pdev[i]);
2731 err_add_udc:
2732         for (i = 0; i < mod_data.num; i++)
2733                 platform_device_del(the_hcd_pdev[i]);
2734 err_add_hcd:
2735         platform_driver_unregister(&dummy_udc_driver);
2736 err_register_udc_driver:
2737         platform_driver_unregister(&dummy_hcd_driver);
2738 err_add_pdata:
2739         for (i = 0; i < mod_data.num; i++)
2740                 kfree(dum[i]);
2741         for (i = 0; i < mod_data.num; i++)
2742                 platform_device_put(the_udc_pdev[i]);
2743 err_alloc_udc:
2744         for (i = 0; i < mod_data.num; i++)
2745                 platform_device_put(the_hcd_pdev[i]);
2746         return retval;
2747 }
2748 module_init(init);
2749 
2750 static void __exit cleanup(void)
2751 {
2752         int i;
2753 
2754         for (i = 0; i < mod_data.num; i++) {
2755                 struct dummy *dum;
2756 
2757                 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2758 
2759                 platform_device_unregister(the_udc_pdev[i]);
2760                 platform_device_unregister(the_hcd_pdev[i]);
2761                 kfree(dum);
2762         }
2763         platform_driver_unregister(&dummy_udc_driver);
2764         platform_driver_unregister(&dummy_hcd_driver);
2765 }
2766 module_exit(cleanup);
2767 

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