Merge with master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / 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  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  */
23
24
25 /*
26  * This exposes a device side "USB gadget" API, driven by requests to a
27  * Linux-USB host controller driver.  USB traffic is simulated; there's
28  * no need for USB hardware.  Use this with two other drivers:
29  *
30  *  - Gadget driver, responding to requests (slave);
31  *  - Host-side device driver, as already familiar in Linux.
32  *
33  * Having this all in one kernel can help some stages of development,
34  * bypassing some hardware (and driver) issues.  UML could help too.
35  */
36
37 #define DEBUG
38
39 #include <linux/config.h>
40 #include <linux/module.h>
41 #include <linux/kernel.h>
42 #include <linux/delay.h>
43 #include <linux/ioport.h>
44 #include <linux/sched.h>
45 #include <linux/slab.h>
46 #include <linux/smp_lock.h>
47 #include <linux/errno.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/list.h>
51 #include <linux/interrupt.h>
52 #include <linux/version.h>
53
54 #include <linux/usb.h>
55 #include <linux/usb_gadget.h>
56
57 #include <asm/byteorder.h>
58 #include <asm/io.h>
59 #include <asm/irq.h>
60 #include <asm/system.h>
61 #include <asm/unaligned.h>
62
63
64 #include "../core/hcd.h"
65
66
67 #define DRIVER_DESC     "USB Host+Gadget Emulator"
68 #define DRIVER_VERSION  "02 May 2005"
69
70 static const char       driver_name [] = "dummy_hcd";
71 static const char       driver_desc [] = "USB Host+Gadget Emulator";
72
73 static const char       gadget_name [] = "dummy_udc";
74
75 MODULE_DESCRIPTION (DRIVER_DESC);
76 MODULE_AUTHOR ("David Brownell");
77 MODULE_LICENSE ("GPL");
78
79 /*-------------------------------------------------------------------------*/
80
81 /* gadget side driver data structres */
82 struct dummy_ep {
83         struct list_head                queue;
84         unsigned long                   last_io;        /* jiffies timestamp */
85         struct usb_gadget               *gadget;
86         const struct usb_endpoint_descriptor *desc;
87         struct usb_ep                   ep;
88         unsigned                        halted : 1;
89         unsigned                        already_seen : 1;
90         unsigned                        setup_stage : 1;
91 };
92
93 struct dummy_request {
94         struct list_head                queue;          /* ep's requests */
95         struct usb_request              req;
96 };
97
98 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
99 {
100         return container_of (_ep, struct dummy_ep, ep);
101 }
102
103 static inline struct dummy_request *usb_request_to_dummy_request
104                 (struct usb_request *_req)
105 {
106         return container_of (_req, struct dummy_request, req);
107 }
108
109 /*-------------------------------------------------------------------------*/
110
111 /*
112  * Every device has ep0 for control requests, plus up to 30 more endpoints,
113  * in one of two types:
114  *
115  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
116  *     number can be changed.  Names like "ep-a" are used for this type.
117  *
118  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
119  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
120  *
121  * Gadget drivers are responsible for not setting up conflicting endpoint
122  * configurations, illegal or unsupported packet lengths, and so on.
123  */
124
125 static const char ep0name [] = "ep0";
126
127 static const char *const ep_name [] = {
128         ep0name,                                /* everyone has ep0 */
129
130         /* act like a net2280: high speed, six configurable endpoints */
131         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
132
133         /* or like 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 #define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *))
143
144 /*-------------------------------------------------------------------------*/
145
146 #define FIFO_SIZE               64
147
148 struct urbp {
149         struct urb              *urb;
150         struct list_head        urbp_list;
151 };
152
153
154 enum dummy_rh_state {
155         DUMMY_RH_RESET,
156         DUMMY_RH_SUSPENDED,
157         DUMMY_RH_RUNNING
158 };
159
160 struct dummy {
161         spinlock_t                      lock;
162
163         /*
164          * SLAVE/GADGET side support
165          */
166         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
167         int                             address;
168         struct usb_gadget               gadget;
169         struct usb_gadget_driver        *driver;
170         struct dummy_request            fifo_req;
171         u8                              fifo_buf [FIFO_SIZE];
172         u16                             devstatus;
173         unsigned                        udc_suspended:1;
174         unsigned                        pullup:1;
175         unsigned                        active:1;
176         unsigned                        old_active:1;
177
178         /*
179          * MASTER/HOST side support
180          */
181         enum dummy_rh_state             rh_state;
182         struct timer_list               timer;
183         u32                             port_status;
184         u32                             old_status;
185         unsigned                        resuming:1;
186         unsigned long                   re_timeout;
187
188         struct usb_device               *udev;
189         struct list_head                urbp_list;
190 };
191
192 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
193 {
194         return (struct dummy *) (hcd->hcd_priv);
195 }
196
197 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
198 {
199         return container_of((void *) dum, struct usb_hcd, hcd_priv);
200 }
201
202 static inline struct device *dummy_dev (struct dummy *dum)
203 {
204         return dummy_to_hcd(dum)->self.controller;
205 }
206
207 static inline struct device *udc_dev (struct dummy *dum)
208 {
209         return dum->gadget.dev.parent;
210 }
211
212 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
213 {
214         return container_of (ep->gadget, struct dummy, gadget);
215 }
216
217 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
218 {
219         return container_of (gadget, struct dummy, gadget);
220 }
221
222 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
223 {
224         return container_of (dev, struct dummy, gadget.dev);
225 }
226
227 static struct dummy                     *the_controller;
228
229 /*-------------------------------------------------------------------------*/
230
231 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
232
233 /* called with spinlock held */
234 static void nuke (struct dummy *dum, struct dummy_ep *ep)
235 {
236         while (!list_empty (&ep->queue)) {
237                 struct dummy_request    *req;
238
239                 req = list_entry (ep->queue.next, struct dummy_request, queue);
240                 list_del_init (&req->queue);
241                 req->req.status = -ESHUTDOWN;
242
243                 spin_unlock (&dum->lock);
244                 req->req.complete (&ep->ep, &req->req);
245                 spin_lock (&dum->lock);
246         }
247 }
248
249 /* caller must hold lock */
250 static void
251 stop_activity (struct dummy *dum)
252 {
253         struct dummy_ep *ep;
254
255         /* prevent any more requests */
256         dum->address = 0;
257
258         /* The timer is left running so that outstanding URBs can fail */
259
260         /* nuke any pending requests first, so driver i/o is quiesced */
261         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
262                 nuke (dum, ep);
263
264         /* driver now does any non-usb quiescing necessary */
265 }
266
267 /* caller must hold lock */
268 static void
269 set_link_state (struct dummy *dum)
270 {
271         dum->active = 0;
272         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
273                 dum->port_status = 0;
274
275         /* UDC suspend must cause a disconnect */
276         else if (!dum->pullup || dum->udc_suspended) {
277                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
278                                         USB_PORT_STAT_ENABLE |
279                                         USB_PORT_STAT_LOW_SPEED |
280                                         USB_PORT_STAT_HIGH_SPEED |
281                                         USB_PORT_STAT_SUSPEND);
282                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
283                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
284         } else {
285                 dum->port_status |= USB_PORT_STAT_CONNECTION;
286                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
287                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
288                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
289                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
290                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
291                                 dum->rh_state != DUMMY_RH_SUSPENDED)
292                         dum->active = 1;
293         }
294
295         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
296                 dum->resuming = 0;
297
298         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
299                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
300                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
301                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
302                                 dum->driver) {
303                         stop_activity (dum);
304                         spin_unlock (&dum->lock);
305                         dum->driver->disconnect (&dum->gadget);
306                         spin_lock (&dum->lock);
307                 }
308         } else if (dum->active != dum->old_active) {
309                 if (dum->old_active && dum->driver->suspend) {
310                         spin_unlock (&dum->lock);
311                         dum->driver->suspend (&dum->gadget);
312                         spin_lock (&dum->lock);
313                 } else if (!dum->old_active && dum->driver->resume) {
314                         spin_unlock (&dum->lock);
315                         dum->driver->resume (&dum->gadget);
316                         spin_lock (&dum->lock);
317                 }
318         }
319
320         dum->old_status = dum->port_status;
321         dum->old_active = dum->active;
322 }
323
324 /*-------------------------------------------------------------------------*/
325
326 /* SLAVE/GADGET SIDE DRIVER
327  *
328  * This only tracks gadget state.  All the work is done when the host
329  * side tries some (emulated) i/o operation.  Real device controller
330  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
331  */
332
333 #define is_enabled(dum) \
334         (dum->port_status & USB_PORT_STAT_ENABLE)
335
336 static int
337 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
338 {
339         struct dummy            *dum;
340         struct dummy_ep         *ep;
341         unsigned                max;
342         int                     retval;
343
344         ep = usb_ep_to_dummy_ep (_ep);
345         if (!_ep || !desc || ep->desc || _ep->name == ep0name
346                         || desc->bDescriptorType != USB_DT_ENDPOINT)
347                 return -EINVAL;
348         dum = ep_to_dummy (ep);
349         if (!dum->driver || !is_enabled (dum))
350                 return -ESHUTDOWN;
351         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
352
353         /* drivers must not request bad settings, since lower levels
354          * (hardware or its drivers) may not check.  some endpoints
355          * can't do iso, many have maxpacket limitations, etc.
356          *
357          * since this "hardware" driver is here to help debugging, we
358          * have some extra sanity checks.  (there could be more though,
359          * especially for "ep9out" style fixed function ones.)
360          */
361         retval = -EINVAL;
362         switch (desc->bmAttributes & 0x03) {
363         case USB_ENDPOINT_XFER_BULK:
364                 if (strstr (ep->ep.name, "-iso")
365                                 || strstr (ep->ep.name, "-int")) {
366                         goto done;
367                 }
368                 switch (dum->gadget.speed) {
369                 case USB_SPEED_HIGH:
370                         if (max == 512)
371                                 break;
372                         /* conserve return statements */
373                 default:
374                         switch (max) {
375                         case 8: case 16: case 32: case 64:
376                                 /* we'll fake any legal size */
377                                 break;
378                         default:
379                 case USB_SPEED_LOW:
380                                 goto done;
381                         }
382                 }
383                 break;
384         case USB_ENDPOINT_XFER_INT:
385                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
386                         goto done;
387                 /* real hardware might not handle all packet sizes */
388                 switch (dum->gadget.speed) {
389                 case USB_SPEED_HIGH:
390                         if (max <= 1024)
391                                 break;
392                         /* save a return statement */
393                 case USB_SPEED_FULL:
394                         if (max <= 64)
395                                 break;
396                         /* save a return statement */
397                 default:
398                         if (max <= 8)
399                                 break;
400                         goto done;
401                 }
402                 break;
403         case USB_ENDPOINT_XFER_ISOC:
404                 if (strstr (ep->ep.name, "-bulk")
405                                 || strstr (ep->ep.name, "-int"))
406                         goto done;
407                 /* real hardware might not handle all packet sizes */
408                 switch (dum->gadget.speed) {
409                 case USB_SPEED_HIGH:
410                         if (max <= 1024)
411                                 break;
412                         /* save a return statement */
413                 case USB_SPEED_FULL:
414                         if (max <= 1023)
415                                 break;
416                         /* save a return statement */
417                 default:
418                         goto done;
419                 }
420                 break;
421         default:
422                 /* few chips support control except on ep0 */
423                 goto done;
424         }
425
426         _ep->maxpacket = max;
427         ep->desc = desc;
428
429         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
430                 _ep->name,
431                 desc->bEndpointAddress & 0x0f,
432                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
433                 ({ char *val;
434                  switch (desc->bmAttributes & 0x03) {
435                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
436                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
437                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
438                  default: val = "ctrl"; break;
439                  }; val; }),
440                 max);
441
442         /* at this point real hardware should be NAKing transfers
443          * to that endpoint, until a buffer is queued to it.
444          */
445         retval = 0;
446 done:
447         return retval;
448 }
449
450 static int dummy_disable (struct usb_ep *_ep)
451 {
452         struct dummy_ep         *ep;
453         struct dummy            *dum;
454         unsigned long           flags;
455         int                     retval;
456
457         ep = usb_ep_to_dummy_ep (_ep);
458         if (!_ep || !ep->desc || _ep->name == ep0name)
459                 return -EINVAL;
460         dum = ep_to_dummy (ep);
461
462         spin_lock_irqsave (&dum->lock, flags);
463         ep->desc = NULL;
464         retval = 0;
465         nuke (dum, ep);
466         spin_unlock_irqrestore (&dum->lock, flags);
467
468         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
469         return retval;
470 }
471
472 static struct usb_request *
473 dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
474 {
475         struct dummy_ep         *ep;
476         struct dummy_request    *req;
477
478         if (!_ep)
479                 return NULL;
480         ep = usb_ep_to_dummy_ep (_ep);
481
482         req = kmalloc (sizeof *req, mem_flags);
483         if (!req)
484                 return NULL;
485         memset (req, 0, sizeof *req);
486         INIT_LIST_HEAD (&req->queue);
487         return &req->req;
488 }
489
490 static void
491 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
492 {
493         struct dummy_ep         *ep;
494         struct dummy_request    *req;
495
496         ep = usb_ep_to_dummy_ep (_ep);
497         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
498                 return;
499
500         req = usb_request_to_dummy_request (_req);
501         WARN_ON (!list_empty (&req->queue));
502         kfree (req);
503 }
504
505 static void *
506 dummy_alloc_buffer (
507         struct usb_ep *_ep,
508         unsigned bytes,
509         dma_addr_t *dma,
510         int mem_flags
511 ) {
512         char                    *retval;
513         struct dummy_ep         *ep;
514         struct dummy            *dum;
515
516         ep = usb_ep_to_dummy_ep (_ep);
517         dum = ep_to_dummy (ep);
518
519         if (!dum->driver)
520                 return NULL;
521         retval = kmalloc (bytes, mem_flags);
522         *dma = (dma_addr_t) retval;
523         return retval;
524 }
525
526 static void
527 dummy_free_buffer (
528         struct usb_ep *_ep,
529         void *buf,
530         dma_addr_t dma,
531         unsigned bytes
532 ) {
533         if (bytes)
534                 kfree (buf);
535 }
536
537 static void
538 fifo_complete (struct usb_ep *ep, struct usb_request *req)
539 {
540 }
541
542 static int
543 dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
544 {
545         struct dummy_ep         *ep;
546         struct dummy_request    *req;
547         struct dummy            *dum;
548         unsigned long           flags;
549
550         req = usb_request_to_dummy_request (_req);
551         if (!_req || !list_empty (&req->queue) || !_req->complete)
552                 return -EINVAL;
553
554         ep = usb_ep_to_dummy_ep (_ep);
555         if (!_ep || (!ep->desc && _ep->name != ep0name))
556                 return -EINVAL;
557
558         dum = ep_to_dummy (ep);
559         if (!dum->driver || !is_enabled (dum))
560                 return -ESHUTDOWN;
561
562 #if 0
563         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
564                         ep, _req, _ep->name, _req->length, _req->buf);
565 #endif
566
567         _req->status = -EINPROGRESS;
568         _req->actual = 0;
569         spin_lock_irqsave (&dum->lock, flags);
570
571         /* implement an emulated single-request FIFO */
572         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
573                         list_empty (&dum->fifo_req.queue) &&
574                         list_empty (&ep->queue) &&
575                         _req->length <= FIFO_SIZE) {
576                 req = &dum->fifo_req;
577                 req->req = *_req;
578                 req->req.buf = dum->fifo_buf;
579                 memcpy (dum->fifo_buf, _req->buf, _req->length);
580                 req->req.context = dum;
581                 req->req.complete = fifo_complete;
582
583                 spin_unlock (&dum->lock);
584                 _req->actual = _req->length;
585                 _req->status = 0;
586                 _req->complete (_ep, _req);
587                 spin_lock (&dum->lock);
588         }
589         list_add_tail (&req->queue, &ep->queue);
590         spin_unlock_irqrestore (&dum->lock, flags);
591
592         /* real hardware would likely enable transfers here, in case
593          * it'd been left NAKing.
594          */
595         return 0;
596 }
597
598 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
599 {
600         struct dummy_ep         *ep;
601         struct dummy            *dum;
602         int                     retval = -EINVAL;
603         unsigned long           flags;
604         struct dummy_request    *req = NULL;
605
606         if (!_ep || !_req)
607                 return retval;
608         ep = usb_ep_to_dummy_ep (_ep);
609         dum = ep_to_dummy (ep);
610
611         if (!dum->driver)
612                 return -ESHUTDOWN;
613
614         spin_lock_irqsave (&dum->lock, flags);
615         list_for_each_entry (req, &ep->queue, queue) {
616                 if (&req->req == _req) {
617                         list_del_init (&req->queue);
618                         _req->status = -ECONNRESET;
619                         retval = 0;
620                         break;
621                 }
622         }
623         spin_unlock_irqrestore (&dum->lock, flags);
624
625         if (retval == 0) {
626                 dev_dbg (udc_dev(dum),
627                                 "dequeued req %p from %s, len %d buf %p\n",
628                                 req, _ep->name, _req->length, _req->buf);
629                 _req->complete (_ep, _req);
630         }
631         return retval;
632 }
633
634 static int
635 dummy_set_halt (struct usb_ep *_ep, int value)
636 {
637         struct dummy_ep         *ep;
638         struct dummy            *dum;
639
640         if (!_ep)
641                 return -EINVAL;
642         ep = usb_ep_to_dummy_ep (_ep);
643         dum = ep_to_dummy (ep);
644         if (!dum->driver)
645                 return -ESHUTDOWN;
646         if (!value)
647                 ep->halted = 0;
648         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
649                         !list_empty (&ep->queue))
650                 return -EAGAIN;
651         else
652                 ep->halted = 1;
653         /* FIXME clear emulated data toggle too */
654         return 0;
655 }
656
657 static const struct usb_ep_ops dummy_ep_ops = {
658         .enable         = dummy_enable,
659         .disable        = dummy_disable,
660
661         .alloc_request  = dummy_alloc_request,
662         .free_request   = dummy_free_request,
663
664         .alloc_buffer   = dummy_alloc_buffer,
665         .free_buffer    = dummy_free_buffer,
666         /* map, unmap, ... eventually hook the "generic" dma calls */
667
668         .queue          = dummy_queue,
669         .dequeue        = dummy_dequeue,
670
671         .set_halt       = dummy_set_halt,
672 };
673
674 /*-------------------------------------------------------------------------*/
675
676 /* there are both host and device side versions of this call ... */
677 static int dummy_g_get_frame (struct usb_gadget *_gadget)
678 {
679         struct timeval  tv;
680
681         do_gettimeofday (&tv);
682         return tv.tv_usec / 1000;
683 }
684
685 static int dummy_wakeup (struct usb_gadget *_gadget)
686 {
687         struct dummy    *dum;
688
689         dum = gadget_to_dummy (_gadget);
690         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
691                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
692                 return -EINVAL;
693         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
694                 return -ENOLINK;
695         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
696                          dum->rh_state != DUMMY_RH_SUSPENDED)
697                 return -EIO;
698
699         /* FIXME: What if the root hub is suspended but the port isn't? */
700
701         /* hub notices our request, issues downstream resume, etc */
702         dum->resuming = 1;
703         dum->re_timeout = jiffies + msecs_to_jiffies(20);
704         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
705         return 0;
706 }
707
708 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
709 {
710         struct dummy    *dum;
711
712         dum = gadget_to_dummy (_gadget);
713         if (value)
714                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
715         else
716                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
717         return 0;
718 }
719
720 static int dummy_pullup (struct usb_gadget *_gadget, int value)
721 {
722         struct dummy    *dum;
723         unsigned long   flags;
724
725         dum = gadget_to_dummy (_gadget);
726         spin_lock_irqsave (&dum->lock, flags);
727         dum->pullup = (value != 0);
728         set_link_state (dum);
729         spin_unlock_irqrestore (&dum->lock, flags);
730
731         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
732         return 0;
733 }
734
735 static const struct usb_gadget_ops dummy_ops = {
736         .get_frame      = dummy_g_get_frame,
737         .wakeup         = dummy_wakeup,
738         .set_selfpowered = dummy_set_selfpowered,
739         .pullup         = dummy_pullup,
740 };
741
742 /*-------------------------------------------------------------------------*/
743
744 /* "function" sysfs attribute */
745 static ssize_t
746 show_function (struct device *dev, struct device_attribute *attr, char *buf)
747 {
748         struct dummy    *dum = gadget_dev_to_dummy (dev);
749
750         if (!dum->driver || !dum->driver->function)
751                 return 0;
752         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
753 }
754 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
755
756 /*-------------------------------------------------------------------------*/
757
758 /*
759  * Driver registration/unregistration.
760  *
761  * This is basically hardware-specific; there's usually only one real USB
762  * device (not host) controller since that's how USB devices are intended
763  * to work.  So most implementations of these api calls will rely on the
764  * fact that only one driver will ever bind to the hardware.  But curious
765  * hardware can be built with discrete components, so the gadget API doesn't
766  * require that assumption.
767  *
768  * For this emulator, it might be convenient to create a usb slave device
769  * for each driver that registers:  just add to a big root hub.
770  */
771
772 int
773 usb_gadget_register_driver (struct usb_gadget_driver *driver)
774 {
775         struct dummy    *dum = the_controller;
776         int             retval, i;
777
778         if (!dum)
779                 return -EINVAL;
780         if (dum->driver)
781                 return -EBUSY;
782         if (!driver->bind || !driver->unbind || !driver->setup
783                         || driver->speed == USB_SPEED_UNKNOWN)
784                 return -EINVAL;
785
786         /*
787          * SLAVE side init ... the layer above hardware, which
788          * can't enumerate without help from the driver we're binding.
789          */
790
791         dum->devstatus = 0;
792
793         INIT_LIST_HEAD (&dum->gadget.ep_list);
794         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
795                 struct dummy_ep *ep = &dum->ep [i];
796
797                 if (!ep_name [i])
798                         break;
799                 ep->ep.name = ep_name [i];
800                 ep->ep.ops = &dummy_ep_ops;
801                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
802                 ep->halted = ep->already_seen = ep->setup_stage = 0;
803                 ep->ep.maxpacket = ~0;
804                 ep->last_io = jiffies;
805                 ep->gadget = &dum->gadget;
806                 ep->desc = NULL;
807                 INIT_LIST_HEAD (&ep->queue);
808         }
809
810         dum->gadget.ep0 = &dum->ep [0].ep;
811         dum->ep [0].ep.maxpacket = 64;
812         list_del_init (&dum->ep [0].ep.ep_list);
813         INIT_LIST_HEAD(&dum->fifo_req.queue);
814
815         dum->driver = driver;
816         dum->gadget.dev.driver = &driver->driver;
817         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
818                         driver->driver.name);
819         if ((retval = driver->bind (&dum->gadget)) != 0) {
820                 dum->driver = NULL;
821                 dum->gadget.dev.driver = NULL;
822                 return retval;
823         }
824
825         driver->driver.bus = dum->gadget.dev.parent->bus;
826         driver_register (&driver->driver);
827         device_bind_driver (&dum->gadget.dev);
828
829         /* khubd will enumerate this in a while */
830         spin_lock_irq (&dum->lock);
831         dum->pullup = 1;
832         set_link_state (dum);
833         spin_unlock_irq (&dum->lock);
834
835         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
836         return 0;
837 }
838 EXPORT_SYMBOL (usb_gadget_register_driver);
839
840 int
841 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
842 {
843         struct dummy    *dum = the_controller;
844         unsigned long   flags;
845
846         if (!dum)
847                 return -ENODEV;
848         if (!driver || driver != dum->driver)
849                 return -EINVAL;
850
851         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
852                         driver->driver.name);
853
854         spin_lock_irqsave (&dum->lock, flags);
855         dum->pullup = 0;
856         set_link_state (dum);
857         spin_unlock_irqrestore (&dum->lock, flags);
858
859         driver->unbind (&dum->gadget);
860         dum->driver = NULL;
861
862         device_release_driver (&dum->gadget.dev);
863         driver_unregister (&driver->driver);
864
865         spin_lock_irqsave (&dum->lock, flags);
866         dum->pullup = 0;
867         set_link_state (dum);
868         spin_unlock_irqrestore (&dum->lock, flags);
869
870         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
871         return 0;
872 }
873 EXPORT_SYMBOL (usb_gadget_unregister_driver);
874
875 #undef is_enabled
876
877 /* just declare this in any driver that really need it */
878 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
879
880 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
881 {
882         return -ENOSYS;
883 }
884 EXPORT_SYMBOL (net2280_set_fifo_mode);
885
886
887 /* The gadget structure is stored inside the hcd structure and will be
888  * released along with it. */
889 static void
890 dummy_gadget_release (struct device *dev)
891 {
892 #if 0           /* usb_bus_put isn't EXPORTed! */
893         struct dummy    *dum = gadget_dev_to_dummy (dev);
894
895         usb_bus_put (&dummy_to_hcd (dum)->self);
896 #endif
897 }
898
899 static int dummy_udc_probe (struct device *dev)
900 {
901         struct dummy    *dum = the_controller;
902         int             rc;
903
904         dum->gadget.name = gadget_name;
905         dum->gadget.ops = &dummy_ops;
906         dum->gadget.is_dualspeed = 1;
907
908         /* maybe claim OTG support, though we won't complete HNP */
909         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
910
911         strcpy (dum->gadget.dev.bus_id, "gadget");
912         dum->gadget.dev.parent = dev;
913         dum->gadget.dev.release = dummy_gadget_release;
914         rc = device_register (&dum->gadget.dev);
915         if (rc < 0)
916                 return rc;
917
918 #if 0           /* usb_bus_get isn't EXPORTed! */
919         usb_bus_get (&dummy_to_hcd (dum)->self);
920 #endif
921
922         dev_set_drvdata (dev, dum);
923         device_create_file (&dum->gadget.dev, &dev_attr_function);
924         return rc;
925 }
926
927 static int dummy_udc_remove (struct device *dev)
928 {
929         struct dummy    *dum = dev_get_drvdata (dev);
930
931         dev_set_drvdata (dev, NULL);
932         device_remove_file (&dum->gadget.dev, &dev_attr_function);
933         device_unregister (&dum->gadget.dev);
934         return 0;
935 }
936
937 static int dummy_udc_suspend (struct device *dev, pm_message_t state,
938                 u32 level)
939 {
940         struct dummy    *dum = dev_get_drvdata(dev);
941
942         if (level != SUSPEND_DISABLE)
943                 return 0;
944
945         dev_dbg (dev, "%s\n", __FUNCTION__);
946         spin_lock_irq (&dum->lock);
947         dum->udc_suspended = 1;
948         set_link_state (dum);
949         spin_unlock_irq (&dum->lock);
950
951         dev->power.power_state = state;
952         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
953         return 0;
954 }
955
956 static int dummy_udc_resume (struct device *dev, u32 level)
957 {
958         struct dummy    *dum = dev_get_drvdata(dev);
959
960         if (level != RESUME_ENABLE)
961                 return 0;
962
963         dev_dbg (dev, "%s\n", __FUNCTION__);
964         spin_lock_irq (&dum->lock);
965         dum->udc_suspended = 0;
966         set_link_state (dum);
967         spin_unlock_irq (&dum->lock);
968
969         dev->power.power_state = PMSG_ON;
970         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
971         return 0;
972 }
973
974 static struct device_driver dummy_udc_driver = {
975         .name           = (char *) gadget_name,
976         .bus            = &platform_bus_type,
977         .probe          = dummy_udc_probe,
978         .remove         = dummy_udc_remove,
979         .suspend        = dummy_udc_suspend,
980         .resume         = dummy_udc_resume,
981 };
982
983 /*-------------------------------------------------------------------------*/
984
985 /* MASTER/HOST SIDE DRIVER
986  *
987  * this uses the hcd framework to hook up to host side drivers.
988  * its root hub will only have one device, otherwise it acts like
989  * a normal host controller.
990  *
991  * when urbs are queued, they're just stuck on a list that we
992  * scan in a timer callback.  that callback connects writes from
993  * the host with reads from the device, and so on, based on the
994  * usb 2.0 rules.
995  */
996
997 static int dummy_urb_enqueue (
998         struct usb_hcd                  *hcd,
999         struct usb_host_endpoint        *ep,
1000         struct urb                      *urb,
1001         int                             mem_flags
1002 ) {
1003         struct dummy    *dum;
1004         struct urbp     *urbp;
1005         unsigned long   flags;
1006
1007         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1008                 return -EINVAL;
1009
1010         urbp = kmalloc (sizeof *urbp, mem_flags);
1011         if (!urbp)
1012                 return -ENOMEM;
1013         urbp->urb = urb;
1014
1015         dum = hcd_to_dummy (hcd);
1016         spin_lock_irqsave (&dum->lock, flags);
1017
1018         if (!dum->udev) {
1019                 dum->udev = urb->dev;
1020                 usb_get_dev (dum->udev);
1021         } else if (unlikely (dum->udev != urb->dev))
1022                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1023
1024         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1025         urb->hcpriv = urbp;
1026         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1027                 urb->error_count = 1;           /* mark as a new urb */
1028
1029         /* kick the scheduler, it'll do the rest */
1030         if (!timer_pending (&dum->timer))
1031                 mod_timer (&dum->timer, jiffies + 1);
1032
1033         spin_unlock_irqrestore (&dum->lock, flags);
1034         return 0;
1035 }
1036
1037 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1038 {
1039         struct dummy    *dum;
1040         unsigned long   flags;
1041
1042         /* giveback happens automatically in timer callback,
1043          * so make sure the callback happens */
1044         dum = hcd_to_dummy (hcd);
1045         spin_lock_irqsave (&dum->lock, flags);
1046         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1047                 mod_timer (&dum->timer, jiffies);
1048         spin_unlock_irqrestore (&dum->lock, flags);
1049         return 0;
1050 }
1051
1052 static void maybe_set_status (struct urb *urb, int status)
1053 {
1054         spin_lock (&urb->lock);
1055         if (urb->status == -EINPROGRESS)
1056                 urb->status = status;
1057         spin_unlock (&urb->lock);
1058 }
1059
1060 /* transfer up to a frame's worth; caller must own lock */
1061 static int
1062 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1063 {
1064         struct dummy_request    *req;
1065
1066 top:
1067         /* if there's no request queued, the device is NAKing; return */
1068         list_for_each_entry (req, &ep->queue, queue) {
1069                 unsigned        host_len, dev_len, len;
1070                 int             is_short, to_host;
1071                 int             rescan = 0;
1072
1073                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1074                  * may be short (including zero length).
1075                  *
1076                  * writer can send a zlp explicitly (length 0) or implicitly
1077                  * (length mod maxpacket zero, and 'zero' flag); they always
1078                  * terminate reads.
1079                  */
1080                 host_len = urb->transfer_buffer_length - urb->actual_length;
1081                 dev_len = req->req.length - req->req.actual;
1082                 len = min (host_len, dev_len);
1083
1084                 /* FIXME update emulated data toggle too */
1085
1086                 to_host = usb_pipein (urb->pipe);
1087                 if (unlikely (len == 0))
1088                         is_short = 1;
1089                 else {
1090                         char            *ubuf, *rbuf;
1091
1092                         /* not enough bandwidth left? */
1093                         if (limit < ep->ep.maxpacket && limit < len)
1094                                 break;
1095                         len = min (len, (unsigned) limit);
1096                         if (len == 0)
1097                                 break;
1098
1099                         /* use an extra pass for the final short packet */
1100                         if (len > ep->ep.maxpacket) {
1101                                 rescan = 1;
1102                                 len -= (len % ep->ep.maxpacket);
1103                         }
1104                         is_short = (len % ep->ep.maxpacket) != 0;
1105
1106                         /* else transfer packet(s) */
1107                         ubuf = urb->transfer_buffer + urb->actual_length;
1108                         rbuf = req->req.buf + req->req.actual;
1109                         if (to_host)
1110                                 memcpy (ubuf, rbuf, len);
1111                         else
1112                                 memcpy (rbuf, ubuf, len);
1113                         ep->last_io = jiffies;
1114
1115                         limit -= len;
1116                         urb->actual_length += len;
1117                         req->req.actual += len;
1118                 }
1119
1120                 /* short packets terminate, maybe with overflow/underflow.
1121                  * it's only really an error to write too much.
1122                  *
1123                  * partially filling a buffer optionally blocks queue advances
1124                  * (so completion handlers can clean up the queue) but we don't
1125                  * need to emulate such data-in-flight.  so we only show part
1126                  * of the URB_SHORT_NOT_OK effect: completion status.
1127                  */
1128                 if (is_short) {
1129                         if (host_len == dev_len) {
1130                                 req->req.status = 0;
1131                                 maybe_set_status (urb, 0);
1132                         } else if (to_host) {
1133                                 req->req.status = 0;
1134                                 if (dev_len > host_len)
1135                                         maybe_set_status (urb, -EOVERFLOW);
1136                                 else
1137                                         maybe_set_status (urb,
1138                                                 (urb->transfer_flags
1139                                                         & URB_SHORT_NOT_OK)
1140                                                 ? -EREMOTEIO : 0);
1141                         } else if (!to_host) {
1142                                 maybe_set_status (urb, 0);
1143                                 if (host_len > dev_len)
1144                                         req->req.status = -EOVERFLOW;
1145                                 else
1146                                         req->req.status = 0;
1147                         }
1148
1149                 /* many requests terminate without a short packet */
1150                 } else {
1151                         if (req->req.length == req->req.actual
1152                                         && !req->req.zero)
1153                                 req->req.status = 0;
1154                         if (urb->transfer_buffer_length == urb->actual_length
1155                                         && !(urb->transfer_flags
1156                                                 & URB_ZERO_PACKET)) {
1157                                 maybe_set_status (urb, 0);
1158                         }
1159                 }
1160
1161                 /* device side completion --> continuable */
1162                 if (req->req.status != -EINPROGRESS) {
1163                         list_del_init (&req->queue);
1164
1165                         spin_unlock (&dum->lock);
1166                         req->req.complete (&ep->ep, &req->req);
1167                         spin_lock (&dum->lock);
1168
1169                         /* requests might have been unlinked... */
1170                         rescan = 1;
1171                 }
1172
1173                 /* host side completion --> terminate */
1174                 if (urb->status != -EINPROGRESS)
1175                         break;
1176
1177                 /* rescan to continue with any other queued i/o */
1178                 if (rescan)
1179                         goto top;
1180         }
1181         return limit;
1182 }
1183
1184 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1185 {
1186         int     limit = ep->ep.maxpacket;
1187
1188         if (dum->gadget.speed == USB_SPEED_HIGH) {
1189                 int     tmp;
1190
1191                 /* high bandwidth mode */
1192                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1193                 tmp = (tmp >> 11) & 0x03;
1194                 tmp *= 8 /* applies to entire frame */;
1195                 limit += limit * tmp;
1196         }
1197         return limit;
1198 }
1199
1200 #define is_active(dum)  ((dum->port_status & \
1201                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1202                         USB_PORT_STAT_SUSPEND)) \
1203                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1204
1205 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1206 {
1207         int             i;
1208
1209         if (!is_active (dum))
1210                 return NULL;
1211         if ((address & ~USB_DIR_IN) == 0)
1212                 return &dum->ep [0];
1213         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1214                 struct dummy_ep *ep = &dum->ep [i];
1215
1216                 if (!ep->desc)
1217                         continue;
1218                 if (ep->desc->bEndpointAddress == address)
1219                         return ep;
1220         }
1221         return NULL;
1222 }
1223
1224 #undef is_active
1225
1226 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1227 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1228 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1229 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1230 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1231 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1232
1233 /* drive both sides of the transfers; looks like irq handlers to
1234  * both drivers except the callbacks aren't in_irq().
1235  */
1236 static void dummy_timer (unsigned long _dum)
1237 {
1238         struct dummy            *dum = (struct dummy *) _dum;
1239         struct urbp             *urbp, *tmp;
1240         unsigned long           flags;
1241         int                     limit, total;
1242         int                     i;
1243
1244         /* simplistic model for one frame's bandwidth */
1245         switch (dum->gadget.speed) {
1246         case USB_SPEED_LOW:
1247                 total = 8/*bytes*/ * 12/*packets*/;
1248                 break;
1249         case USB_SPEED_FULL:
1250                 total = 64/*bytes*/ * 19/*packets*/;
1251                 break;
1252         case USB_SPEED_HIGH:
1253                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1254                 break;
1255         default:
1256                 dev_err (dummy_dev(dum), "bogus device speed\n");
1257                 return;
1258         }
1259
1260         /* FIXME if HZ != 1000 this will probably misbehave ... */
1261
1262         /* look at each urb queued by the host side driver */
1263         spin_lock_irqsave (&dum->lock, flags);
1264
1265         if (!dum->udev) {
1266                 dev_err (dummy_dev(dum),
1267                                 "timer fired with no URBs pending?\n");
1268                 spin_unlock_irqrestore (&dum->lock, flags);
1269                 return;
1270         }
1271
1272         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1273                 if (!ep_name [i])
1274                         break;
1275                 dum->ep [i].already_seen = 0;
1276         }
1277
1278 restart:
1279         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1280                 struct urb              *urb;
1281                 struct dummy_request    *req;
1282                 u8                      address;
1283                 struct dummy_ep         *ep = NULL;
1284                 int                     type;
1285
1286                 urb = urbp->urb;
1287                 if (urb->status != -EINPROGRESS) {
1288                         /* likely it was just unlinked */
1289                         goto return_urb;
1290                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1291                         continue;
1292                 type = usb_pipetype (urb->pipe);
1293
1294                 /* used up this frame's non-periodic bandwidth?
1295                  * FIXME there's infinite bandwidth for control and
1296                  * periodic transfers ... unrealistic.
1297                  */
1298                 if (total <= 0 && type == PIPE_BULK)
1299                         continue;
1300
1301                 /* find the gadget's ep for this request (if configured) */
1302                 address = usb_pipeendpoint (urb->pipe);
1303                 if (usb_pipein (urb->pipe))
1304                         address |= USB_DIR_IN;
1305                 ep = find_endpoint(dum, address);
1306                 if (!ep) {
1307                         /* set_configuration() disagreement */
1308                         dev_dbg (dummy_dev(dum),
1309                                 "no ep configured for urb %p\n",
1310                                 urb);
1311                         maybe_set_status (urb, -EPROTO);
1312                         goto return_urb;
1313                 }
1314
1315                 if (ep->already_seen)
1316                         continue;
1317                 ep->already_seen = 1;
1318                 if (ep == &dum->ep [0] && urb->error_count) {
1319                         ep->setup_stage = 1;    /* a new urb */
1320                         urb->error_count = 0;
1321                 }
1322                 if (ep->halted && !ep->setup_stage) {
1323                         /* NOTE: must not be iso! */
1324                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1325                                         ep->ep.name, urb);
1326                         maybe_set_status (urb, -EPIPE);
1327                         goto return_urb;
1328                 }
1329                 /* FIXME make sure both ends agree on maxpacket */
1330
1331                 /* handle control requests */
1332                 if (ep == &dum->ep [0] && ep->setup_stage) {
1333                         struct usb_ctrlrequest          setup;
1334                         int                             value = 1;
1335                         struct dummy_ep                 *ep2;
1336                         unsigned                        w_index;
1337                         unsigned                        w_value;
1338
1339                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1340                         w_index = le16_to_cpu(setup.wIndex);
1341                         w_value = le16_to_cpu(setup.wValue);
1342                         if (le16_to_cpu(setup.wLength) !=
1343                                         urb->transfer_buffer_length) {
1344                                 maybe_set_status (urb, -EOVERFLOW);
1345                                 goto return_urb;
1346                         }
1347
1348                         /* paranoia, in case of stale queued data */
1349                         list_for_each_entry (req, &ep->queue, queue) {
1350                                 list_del_init (&req->queue);
1351                                 req->req.status = -EOVERFLOW;
1352                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1353                                                 req);
1354
1355                                 spin_unlock (&dum->lock);
1356                                 req->req.complete (&ep->ep, &req->req);
1357                                 spin_lock (&dum->lock);
1358                                 ep->already_seen = 0;
1359                                 goto restart;
1360                         }
1361
1362                         /* gadget driver never sees set_address or operations
1363                          * on standard feature flags.  some hardware doesn't
1364                          * even expose them.
1365                          */
1366                         ep->last_io = jiffies;
1367                         ep->setup_stage = 0;
1368                         ep->halted = 0;
1369                         switch (setup.bRequest) {
1370                         case USB_REQ_SET_ADDRESS:
1371                                 if (setup.bRequestType != Dev_Request)
1372                                         break;
1373                                 dum->address = w_value;
1374                                 maybe_set_status (urb, 0);
1375                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1376                                                 w_value);
1377                                 value = 0;
1378                                 break;
1379                         case USB_REQ_SET_FEATURE:
1380                                 if (setup.bRequestType == Dev_Request) {
1381                                         value = 0;
1382                                         switch (w_value) {
1383                                         case USB_DEVICE_REMOTE_WAKEUP:
1384                                                 break;
1385                                         case USB_DEVICE_B_HNP_ENABLE:
1386                                                 dum->gadget.b_hnp_enable = 1;
1387                                                 break;
1388                                         case USB_DEVICE_A_HNP_SUPPORT:
1389                                                 dum->gadget.a_hnp_support = 1;
1390                                                 break;
1391                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1392                                                 dum->gadget.a_alt_hnp_support
1393                                                         = 1;
1394                                                 break;
1395                                         default:
1396                                                 value = -EOPNOTSUPP;
1397                                         }
1398                                         if (value == 0) {
1399                                                 dum->devstatus |=
1400                                                         (1 << w_value);
1401                                                 maybe_set_status (urb, 0);
1402                                         }
1403
1404                                 } else if (setup.bRequestType == Ep_Request) {
1405                                         // endpoint halt
1406                                         ep2 = find_endpoint (dum, w_index);
1407                                         if (!ep2) {
1408                                                 value = -EOPNOTSUPP;
1409                                                 break;
1410                                         }
1411                                         ep2->halted = 1;
1412                                         value = 0;
1413                                         maybe_set_status (urb, 0);
1414                                 }
1415                                 break;
1416                         case USB_REQ_CLEAR_FEATURE:
1417                                 if (setup.bRequestType == Dev_Request) {
1418                                         switch (w_value) {
1419                                         case USB_DEVICE_REMOTE_WAKEUP:
1420                                                 dum->devstatus &= ~(1 <<
1421                                                         USB_DEVICE_REMOTE_WAKEUP);
1422                                                 value = 0;
1423                                                 maybe_set_status (urb, 0);
1424                                                 break;
1425                                         default:
1426                                                 value = -EOPNOTSUPP;
1427                                                 break;
1428                                         }
1429                                 } else if (setup.bRequestType == Ep_Request) {
1430                                         // endpoint halt
1431                                         ep2 = find_endpoint (dum, w_index);
1432                                         if (!ep2) {
1433                                                 value = -EOPNOTSUPP;
1434                                                 break;
1435                                         }
1436                                         ep2->halted = 0;
1437                                         value = 0;
1438                                         maybe_set_status (urb, 0);
1439                                 }
1440                                 break;
1441                         case USB_REQ_GET_STATUS:
1442                                 if (setup.bRequestType == Dev_InRequest
1443                                                 || setup.bRequestType
1444                                                         == Intf_InRequest
1445                                                 || setup.bRequestType
1446                                                         == Ep_InRequest
1447                                                 ) {
1448                                         char *buf;
1449
1450                                         // device: remote wakeup, selfpowered
1451                                         // interface: nothing
1452                                         // endpoint: halt
1453                                         buf = (char *)urb->transfer_buffer;
1454                                         if (urb->transfer_buffer_length > 0) {
1455                                                 if (setup.bRequestType ==
1456                                                                 Ep_InRequest) {
1457         ep2 = find_endpoint (dum, w_index);
1458         if (!ep2) {
1459                 value = -EOPNOTSUPP;
1460                 break;
1461         }
1462         buf [0] = ep2->halted;
1463                                                 } else if (setup.bRequestType ==
1464                                                                 Dev_InRequest) {
1465                                                         buf [0] = (u8)
1466                                                                 dum->devstatus;
1467                                                 } else
1468                                                         buf [0] = 0;
1469                                         }
1470                                         if (urb->transfer_buffer_length > 1)
1471                                                 buf [1] = 0;
1472                                         urb->actual_length = min (2,
1473                                                 urb->transfer_buffer_length);
1474                                         value = 0;
1475                                         maybe_set_status (urb, 0);
1476                                 }
1477                                 break;
1478                         }
1479
1480                         /* gadget driver handles all other requests.  block
1481                          * until setup() returns; no reentrancy issues etc.
1482                          */
1483                         if (value > 0) {
1484                                 spin_unlock (&dum->lock);
1485                                 value = dum->driver->setup (&dum->gadget,
1486                                                 &setup);
1487                                 spin_lock (&dum->lock);
1488
1489                                 if (value >= 0) {
1490                                         /* no delays (max 64KB data stage) */
1491                                         limit = 64*1024;
1492                                         goto treat_control_like_bulk;
1493                                 }
1494                                 /* error, see below */
1495                         }
1496
1497                         if (value < 0) {
1498                                 if (value != -EOPNOTSUPP)
1499                                         dev_dbg (udc_dev(dum),
1500                                                 "setup --> %d\n",
1501                                                 value);
1502                                 maybe_set_status (urb, -EPIPE);
1503                                 urb->actual_length = 0;
1504                         }
1505
1506                         goto return_urb;
1507                 }
1508
1509                 /* non-control requests */
1510                 limit = total;
1511                 switch (usb_pipetype (urb->pipe)) {
1512                 case PIPE_ISOCHRONOUS:
1513                         /* FIXME is it urb->interval since the last xfer?
1514                          * use urb->iso_frame_desc[i].
1515                          * complete whether or not ep has requests queued.
1516                          * report random errors, to debug drivers.
1517                          */
1518                         limit = max (limit, periodic_bytes (dum, ep));
1519                         maybe_set_status (urb, -ENOSYS);
1520                         break;
1521
1522                 case PIPE_INTERRUPT:
1523                         /* FIXME is it urb->interval since the last xfer?
1524                          * this almost certainly polls too fast.
1525                          */
1526                         limit = max (limit, periodic_bytes (dum, ep));
1527                         /* FALLTHROUGH */
1528
1529                 // case PIPE_BULK:  case PIPE_CONTROL:
1530                 default:
1531                 treat_control_like_bulk:
1532                         ep->last_io = jiffies;
1533                         total = transfer (dum, urb, ep, limit);
1534                         break;
1535                 }
1536
1537                 /* incomplete transfer? */
1538                 if (urb->status == -EINPROGRESS)
1539                         continue;
1540
1541 return_urb:
1542                 urb->hcpriv = NULL;
1543                 list_del (&urbp->urbp_list);
1544                 kfree (urbp);
1545                 if (ep)
1546                         ep->already_seen = ep->setup_stage = 0;
1547
1548                 spin_unlock (&dum->lock);
1549                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1550                 spin_lock (&dum->lock);
1551
1552                 goto restart;
1553         }
1554
1555         if (list_empty (&dum->urbp_list)) {
1556                 usb_put_dev (dum->udev);
1557                 dum->udev = NULL;
1558         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1559                 /* want a 1 msec delay here */
1560                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1561         }
1562
1563         spin_unlock_irqrestore (&dum->lock, flags);
1564 }
1565
1566 /*-------------------------------------------------------------------------*/
1567
1568 #define PORT_C_MASK \
1569         ((USB_PORT_STAT_C_CONNECTION \
1570         | USB_PORT_STAT_C_ENABLE \
1571         | USB_PORT_STAT_C_SUSPEND \
1572         | USB_PORT_STAT_C_OVERCURRENT \
1573         | USB_PORT_STAT_C_RESET) << 16)
1574
1575 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1576 {
1577         struct dummy            *dum;
1578         unsigned long           flags;
1579         int                     retval = 0;
1580
1581         dum = hcd_to_dummy (hcd);
1582
1583         spin_lock_irqsave (&dum->lock, flags);
1584         if (hcd->state != HC_STATE_RUNNING)
1585                 goto done;
1586
1587         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1588                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1589                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1590                 set_link_state (dum);
1591         }
1592
1593         if ((dum->port_status & PORT_C_MASK) != 0) {
1594                 *buf = (1 << 1);
1595                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1596                                 dum->port_status);
1597                 retval = 1;
1598                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1599                         usb_hcd_resume_root_hub (hcd);
1600         }
1601 done:
1602         spin_unlock_irqrestore (&dum->lock, flags);
1603         return retval;
1604 }
1605
1606 static inline void
1607 hub_descriptor (struct usb_hub_descriptor *desc)
1608 {
1609         memset (desc, 0, sizeof *desc);
1610         desc->bDescriptorType = 0x29;
1611         desc->bDescLength = 9;
1612         desc->wHubCharacteristics = (__force __u16)
1613                         (__constant_cpu_to_le16 (0x0001));
1614         desc->bNbrPorts = 1;
1615         desc->bitmap [0] = 0xff;
1616         desc->bitmap [1] = 0xff;
1617 }
1618
1619 static int dummy_hub_control (
1620         struct usb_hcd  *hcd,
1621         u16             typeReq,
1622         u16             wValue,
1623         u16             wIndex,
1624         char            *buf,
1625         u16             wLength
1626 ) {
1627         struct dummy    *dum;
1628         int             retval = 0;
1629         unsigned long   flags;
1630
1631         if (hcd->state != HC_STATE_RUNNING)
1632                 return -ETIMEDOUT;
1633
1634         dum = hcd_to_dummy (hcd);
1635         spin_lock_irqsave (&dum->lock, flags);
1636         switch (typeReq) {
1637         case ClearHubFeature:
1638                 break;
1639         case ClearPortFeature:
1640                 switch (wValue) {
1641                 case USB_PORT_FEAT_SUSPEND:
1642                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1643                                 /* 20msec resume signaling */
1644                                 dum->resuming = 1;
1645                                 dum->re_timeout = jiffies +
1646                                                 msecs_to_jiffies(20);
1647                         }
1648                         break;
1649                 case USB_PORT_FEAT_POWER:
1650                         if (dum->port_status & USB_PORT_STAT_POWER)
1651                                 dev_dbg (dummy_dev(dum), "power-off\n");
1652                         /* FALLS THROUGH */
1653                 default:
1654                         dum->port_status &= ~(1 << wValue);
1655                         set_link_state (dum);
1656                 }
1657                 break;
1658         case GetHubDescriptor:
1659                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1660                 break;
1661         case GetHubStatus:
1662                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1663                 break;
1664         case GetPortStatus:
1665                 if (wIndex != 1)
1666                         retval = -EPIPE;
1667
1668                 /* whoever resets or resumes must GetPortStatus to
1669                  * complete it!!
1670                  */
1671                 if (dum->resuming &&
1672                                 time_after_eq (jiffies, dum->re_timeout)) {
1673                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1674                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1675                 }
1676                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1677                                 time_after_eq (jiffies, dum->re_timeout)) {
1678                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1679                         dum->port_status &= ~USB_PORT_STAT_RESET;
1680                         if (dum->pullup) {
1681                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1682                                 /* give it the best speed we agree on */
1683                                 dum->gadget.speed = dum->driver->speed;
1684                                 dum->gadget.ep0->maxpacket = 64;
1685                                 switch (dum->gadget.speed) {
1686                                 case USB_SPEED_HIGH:
1687                                         dum->port_status |=
1688                                                 USB_PORT_STAT_HIGH_SPEED;
1689                                         break;
1690                                 case USB_SPEED_LOW:
1691                                         dum->gadget.ep0->maxpacket = 8;
1692                                         dum->port_status |=
1693                                                 USB_PORT_STAT_LOW_SPEED;
1694                                         break;
1695                                 default:
1696                                         dum->gadget.speed = USB_SPEED_FULL;
1697                                         break;
1698                                 }
1699                         }
1700                 }
1701                 set_link_state (dum);
1702                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1703                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1704                 break;
1705         case SetHubFeature:
1706                 retval = -EPIPE;
1707                 break;
1708         case SetPortFeature:
1709                 switch (wValue) {
1710                 case USB_PORT_FEAT_SUSPEND:
1711                         if (dum->active) {
1712                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1713
1714                                 /* HNP would happen here; for now we
1715                                  * assume b_bus_req is always true.
1716                                  */
1717                                 set_link_state (dum);
1718                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1719                                                 & dum->devstatus) != 0)
1720                                         dev_dbg (dummy_dev(dum),
1721                                                         "no HNP yet!\n");
1722                         }
1723                         break;
1724                 case USB_PORT_FEAT_POWER:
1725                         dum->port_status |= USB_PORT_STAT_POWER;
1726                         set_link_state (dum);
1727                         break;
1728                 case USB_PORT_FEAT_RESET:
1729                         /* if it's already enabled, disable */
1730                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1731                                         | USB_PORT_STAT_LOW_SPEED
1732                                         | USB_PORT_STAT_HIGH_SPEED);
1733                         dum->devstatus = 0;
1734                         /* 50msec reset signaling */
1735                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1736                         /* FALLS THROUGH */
1737                 default:
1738                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1739                                 dum->port_status |= (1 << wValue);
1740                                 set_link_state (dum);
1741                         }
1742                 }
1743                 break;
1744
1745         default:
1746                 dev_dbg (dummy_dev(dum),
1747                         "hub control req%04x v%04x i%04x l%d\n",
1748                         typeReq, wValue, wIndex, wLength);
1749
1750                 /* "protocol stall" on error */
1751                 retval = -EPIPE;
1752         }
1753         spin_unlock_irqrestore (&dum->lock, flags);
1754
1755         if ((dum->port_status & PORT_C_MASK) != 0)
1756                 usb_hcd_poll_rh_status (hcd);
1757         return retval;
1758 }
1759
1760 static int dummy_hub_suspend (struct usb_hcd *hcd)
1761 {
1762         struct dummy *dum = hcd_to_dummy (hcd);
1763
1764         spin_lock_irq (&dum->lock);
1765         dum->rh_state = DUMMY_RH_SUSPENDED;
1766         set_link_state (dum);
1767         spin_unlock_irq (&dum->lock);
1768         return 0;
1769 }
1770
1771 static int dummy_hub_resume (struct usb_hcd *hcd)
1772 {
1773         struct dummy *dum = hcd_to_dummy (hcd);
1774
1775         spin_lock_irq (&dum->lock);
1776         dum->rh_state = DUMMY_RH_RUNNING;
1777         set_link_state (dum);
1778         if (!list_empty(&dum->urbp_list))
1779                 mod_timer (&dum->timer, jiffies);
1780         spin_unlock_irq (&dum->lock);
1781         return 0;
1782 }
1783
1784 /*-------------------------------------------------------------------------*/
1785
1786 static inline ssize_t
1787 show_urb (char *buf, size_t size, struct urb *urb)
1788 {
1789         int ep = usb_pipeendpoint (urb->pipe);
1790
1791         return snprintf (buf, size,
1792                 "urb/%p %s ep%d%s%s len %d/%d\n",
1793                 urb,
1794                 ({ char *s;
1795                  switch (urb->dev->speed) {
1796                  case USB_SPEED_LOW:    s = "ls"; break;
1797                  case USB_SPEED_FULL:   s = "fs"; break;
1798                  case USB_SPEED_HIGH:   s = "hs"; break;
1799                  default:               s = "?"; break;
1800                  }; s; }),
1801                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1802                 ({ char *s; \
1803                  switch (usb_pipetype (urb->pipe)) { \
1804                  case PIPE_CONTROL:     s = ""; break; \
1805                  case PIPE_BULK:        s = "-bulk"; break; \
1806                  case PIPE_INTERRUPT:   s = "-int"; break; \
1807                  default:               s = "-iso"; break; \
1808                 }; s;}),
1809                 urb->actual_length, urb->transfer_buffer_length);
1810 }
1811
1812 static ssize_t
1813 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1814 {
1815         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1816         struct dummy            *dum = hcd_to_dummy (hcd);
1817         struct urbp             *urbp;
1818         size_t                  size = 0;
1819         unsigned long           flags;
1820
1821         spin_lock_irqsave (&dum->lock, flags);
1822         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1823                 size_t          temp;
1824
1825                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1826                 buf += temp;
1827                 size += temp;
1828         }
1829         spin_unlock_irqrestore (&dum->lock, flags);
1830
1831         return size;
1832 }
1833 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1834
1835 static int dummy_start (struct usb_hcd *hcd)
1836 {
1837         struct dummy            *dum;
1838
1839         dum = hcd_to_dummy (hcd);
1840
1841         /*
1842          * MASTER side init ... we emulate a root hub that'll only ever
1843          * talk to one device (the slave side).  Also appears in sysfs,
1844          * just like more familiar pci-based HCDs.
1845          */
1846         spin_lock_init (&dum->lock);
1847         init_timer (&dum->timer);
1848         dum->timer.function = dummy_timer;
1849         dum->timer.data = (unsigned long) dum;
1850         dum->rh_state = DUMMY_RH_RUNNING;
1851
1852         INIT_LIST_HEAD (&dum->urbp_list);
1853
1854         /* only show a low-power port: just 8mA */
1855         hcd->power_budget = 8;
1856         hcd->state = HC_STATE_RUNNING;
1857         hcd->uses_new_polling = 1;
1858
1859 #ifdef CONFIG_USB_OTG
1860         hcd->self.otg_port = 1;
1861 #endif
1862
1863         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1864         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1865         return 0;
1866 }
1867
1868 static void dummy_stop (struct usb_hcd *hcd)
1869 {
1870         struct dummy            *dum;
1871
1872         dum = hcd_to_dummy (hcd);
1873
1874         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1875         usb_gadget_unregister_driver (dum->driver);
1876         dev_info (dummy_dev(dum), "stopped\n");
1877 }
1878
1879 /*-------------------------------------------------------------------------*/
1880
1881 static int dummy_h_get_frame (struct usb_hcd *hcd)
1882 {
1883         return dummy_g_get_frame (NULL);
1884 }
1885
1886 static const struct hc_driver dummy_hcd = {
1887         .description =          (char *) driver_name,
1888         .product_desc =         "Dummy host controller",
1889         .hcd_priv_size =        sizeof(struct dummy),
1890
1891         .flags =                HCD_USB2,
1892
1893         .start =                dummy_start,
1894         .stop =                 dummy_stop,
1895
1896         .urb_enqueue =          dummy_urb_enqueue,
1897         .urb_dequeue =          dummy_urb_dequeue,
1898
1899         .get_frame_number =     dummy_h_get_frame,
1900
1901         .hub_status_data =      dummy_hub_status,
1902         .hub_control =          dummy_hub_control,
1903         .hub_suspend =          dummy_hub_suspend,
1904         .hub_resume =           dummy_hub_resume,
1905 };
1906
1907 static int dummy_hcd_probe (struct device *dev)
1908 {
1909         struct usb_hcd          *hcd;
1910         int                     retval;
1911
1912         dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1913
1914         hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1915         if (!hcd)
1916                 return -ENOMEM;
1917         the_controller = hcd_to_dummy (hcd);
1918
1919         retval = usb_add_hcd(hcd, 0, 0);
1920         if (retval != 0) {
1921                 usb_put_hcd (hcd);
1922                 the_controller = NULL;
1923         }
1924         return retval;
1925 }
1926
1927 static int dummy_hcd_remove (struct device *dev)
1928 {
1929         struct usb_hcd          *hcd;
1930
1931         hcd = dev_get_drvdata (dev);
1932         usb_remove_hcd (hcd);
1933         usb_put_hcd (hcd);
1934         the_controller = NULL;
1935         return 0;
1936 }
1937
1938 static int dummy_hcd_suspend (struct device *dev, pm_message_t state,
1939                 u32 level)
1940 {
1941         struct usb_hcd          *hcd;
1942
1943         if (level != SUSPEND_DISABLE)
1944                 return 0;
1945
1946         dev_dbg (dev, "%s\n", __FUNCTION__);
1947         hcd = dev_get_drvdata (dev);
1948
1949 #ifndef CONFIG_USB_SUSPEND
1950         /* Otherwise this would never happen */
1951         usb_lock_device (hcd->self.root_hub);
1952         dummy_hub_suspend (hcd);
1953         usb_unlock_device (hcd->self.root_hub);
1954 #endif
1955
1956         hcd->state = HC_STATE_SUSPENDED;
1957         return 0;
1958 }
1959
1960 static int dummy_hcd_resume (struct device *dev, u32 level)
1961 {
1962         struct usb_hcd          *hcd;
1963
1964         if (level != RESUME_ENABLE)
1965                 return 0;
1966
1967         dev_dbg (dev, "%s\n", __FUNCTION__);
1968         hcd = dev_get_drvdata (dev);
1969         hcd->state = HC_STATE_RUNNING;
1970
1971 #ifndef CONFIG_USB_SUSPEND
1972         /* Otherwise this would never happen */
1973         usb_lock_device (hcd->self.root_hub);
1974         dummy_hub_resume (hcd);
1975         usb_unlock_device (hcd->self.root_hub);
1976 #endif
1977
1978         usb_hcd_poll_rh_status (hcd);
1979         return 0;
1980 }
1981
1982 static struct device_driver dummy_hcd_driver = {
1983         .name           = (char *) driver_name,
1984         .bus            = &platform_bus_type,
1985         .probe          = dummy_hcd_probe,
1986         .remove         = dummy_hcd_remove,
1987         .suspend        = dummy_hcd_suspend,
1988         .resume         = dummy_hcd_resume,
1989 };
1990
1991 /*-------------------------------------------------------------------------*/
1992
1993 /* These don't need to do anything because the pdev structures are
1994  * statically allocated. */
1995 static void
1996 dummy_udc_release (struct device *dev) {}
1997
1998 static void
1999 dummy_hcd_release (struct device *dev) {}
2000
2001 static struct platform_device           the_udc_pdev = {
2002         .name           = (char *) gadget_name,
2003         .id             = -1,
2004         .dev            = {
2005                 .release        = dummy_udc_release,
2006         },
2007 };
2008
2009 static struct platform_device           the_hcd_pdev = {
2010         .name           = (char *) driver_name,
2011         .id             = -1,
2012         .dev            = {
2013                 .release        = dummy_hcd_release,
2014         },
2015 };
2016
2017 static int __init init (void)
2018 {
2019         int     retval;
2020
2021         if (usb_disabled ())
2022                 return -ENODEV;
2023
2024         retval = driver_register (&dummy_hcd_driver);
2025         if (retval < 0)
2026                 return retval;
2027
2028         retval = driver_register (&dummy_udc_driver);
2029         if (retval < 0)
2030                 goto err_register_udc_driver;
2031
2032         retval = platform_device_register (&the_hcd_pdev);
2033         if (retval < 0)
2034                 goto err_register_hcd;
2035
2036         retval = platform_device_register (&the_udc_pdev);
2037         if (retval < 0)
2038                 goto err_register_udc;
2039         return retval;
2040
2041 err_register_udc:
2042         platform_device_unregister (&the_hcd_pdev);
2043 err_register_hcd:
2044         driver_unregister (&dummy_udc_driver);
2045 err_register_udc_driver:
2046         driver_unregister (&dummy_hcd_driver);
2047         return retval;
2048 }
2049 module_init (init);
2050
2051 static void __exit cleanup (void)
2052 {
2053         platform_device_unregister (&the_udc_pdev);
2054         platform_device_unregister (&the_hcd_pdev);
2055         driver_unregister (&dummy_udc_driver);
2056         driver_unregister (&dummy_hcd_driver);
2057 }
2058 module_exit (cleanup);