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, 2004 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 "17 Dec 2004"
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 #define FIFO_SIZE 64
145
146 struct urbp {
147 struct urb *urb;
148 struct list_head urbp_list;
149 };
150
151 struct dummy {
152 spinlock_t lock;
153
154 /*
155 * SLAVE/GADGET side support
156 */
157 struct dummy_ep ep [DUMMY_ENDPOINTS];
158 int address;
159 struct usb_gadget gadget;
160 struct usb_gadget_driver *driver;
161 struct dummy_request fifo_req;
162 u8 fifo_buf [FIFO_SIZE];
163 u16 devstatus;
164
165 /*
166 * MASTER/HOST side support
167 */
168 struct timer_list timer;
169 u32 port_status;
170 unsigned started:1;
171 unsigned resuming:1;
172 unsigned long re_timeout;
173
174 struct usb_device *udev;
175 struct list_head urbp_list;
176 };
177
178 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
179 {
180 return (struct dummy *) (hcd->hcd_priv);
181 }
182
183 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
184 {
185 return container_of((void *) dum, struct usb_hcd, hcd_priv);
186 }
187
188 static inline struct device *dummy_dev (struct dummy *dum)
189 {
190 return dummy_to_hcd(dum)->self.controller;
191 }
192
193 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
194 {
195 return container_of (ep->gadget, struct dummy, gadget);
196 }
197
198 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
199 {
200 return container_of (gadget, struct dummy, gadget);
201 }
202
203 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
204 {
205 return container_of (dev, struct dummy, gadget.dev);
206 }
207
208 static struct dummy *the_controller;
209
210 /*-------------------------------------------------------------------------*/
211
212 /*
213 * This "hardware" may look a bit odd in diagnostics since it's got both
214 * host and device sides; and it binds different drivers to each side.
215 */
216 static struct platform_device the_pdev;
217
218 static struct device_driver dummy_driver = {
219 .name = (char *) driver_name,
220 .bus = &platform_bus_type,
221 };
222
223 /*-------------------------------------------------------------------------*/
224
225 /* SLAVE/GADGET SIDE DRIVER
226 *
227 * This only tracks gadget state. All the work is done when the host
228 * side tries some (emulated) i/o operation. Real device controller
229 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
230 */
231
232 #define is_enabled(dum) \
233 (dum->port_status & USB_PORT_STAT_ENABLE)
234
235 static int
236 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
237 {
238 struct dummy *dum;
239 struct dummy_ep *ep;
240 unsigned max;
241 int retval;
242
243 ep = usb_ep_to_dummy_ep (_ep);
244 if (!_ep || !desc || ep->desc || _ep->name == ep0name
245 || desc->bDescriptorType != USB_DT_ENDPOINT)
246 return -EINVAL;
247 dum = ep_to_dummy (ep);
248 if (!dum->driver || !is_enabled (dum))
249 return -ESHUTDOWN;
250 max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
251
252 /* drivers must not request bad settings, since lower levels
253 * (hardware or its drivers) may not check. some endpoints
254 * can't do iso, many have maxpacket limitations, etc.
255 *
256 * since this "hardware" driver is here to help debugging, we
257 * have some extra sanity checks. (there could be more though,
258 * especially for "ep9out" style fixed function ones.)
259 */
260 retval = -EINVAL;
261 switch (desc->bmAttributes & 0x03) {
262 case USB_ENDPOINT_XFER_BULK:
263 if (strstr (ep->ep.name, "-iso")
264 || strstr (ep->ep.name, "-int")) {
265 goto done;
266 }
267 switch (dum->gadget.speed) {
268 case USB_SPEED_HIGH:
269 if (max == 512)
270 break;
271 /* conserve return statements */
272 default:
273 switch (max) {
274 case 8: case 16: case 32: case 64:
275 /* we'll fake any legal size */
276 break;
277 default:
278 case USB_SPEED_LOW:
279 goto done;
280 }
281 }
282 break;
283 case USB_ENDPOINT_XFER_INT:
284 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
285 goto done;
286 /* real hardware might not handle all packet sizes */
287 switch (dum->gadget.speed) {
288 case USB_SPEED_HIGH:
289 if (max <= 1024)
290 break;
291 /* save a return statement */
292 case USB_SPEED_FULL:
293 if (max <= 64)
294 break;
295 /* save a return statement */
296 default:
297 if (max <= 8)
298 break;
299 goto done;
300 }
301 break;
302 case USB_ENDPOINT_XFER_ISOC:
303 if (strstr (ep->ep.name, "-bulk")
304 || strstr (ep->ep.name, "-int"))
305 goto done;
306 /* real hardware might not handle all packet sizes */
307 switch (dum->gadget.speed) {
308 case USB_SPEED_HIGH:
309 if (max <= 1024)
310 break;
311 /* save a return statement */
312 case USB_SPEED_FULL:
313 if (max <= 1023)
314 break;
315 /* save a return statement */
316 default:
317 goto done;
318 }
319 break;
320 default:
321 /* few chips support control except on ep0 */
322 goto done;
323 }
324
325 _ep->maxpacket = max;
326 ep->desc = desc;
327
328 dev_dbg (dummy_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
329 _ep->name,
330 desc->bEndpointAddress & 0x0f,
331 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
332 ({ char *val;
333 switch (desc->bmAttributes & 0x03) {
334 case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
335 case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
336 case USB_ENDPOINT_XFER_INT: val = "intr"; break;
337 default: val = "ctrl"; break;
338 }; val; }),
339 max);
340
341 /* at this point real hardware should be NAKing transfers
342 * to that endpoint, until a buffer is queued to it.
343 */
344 retval = 0;
345 done:
346 return retval;
347 }
348
349 /* called with spinlock held */
350 static void nuke (struct dummy *dum, struct dummy_ep *ep)
351 {
352 while (!list_empty (&ep->queue)) {
353 struct dummy_request *req;
354
355 req = list_entry (ep->queue.next, struct dummy_request, queue);
356 list_del_init (&req->queue);
357 req->req.status = -ESHUTDOWN;
358
359 spin_unlock (&dum->lock);
360 req->req.complete (&ep->ep, &req->req);
361 spin_lock (&dum->lock);
362 }
363 }
364
365 static int dummy_disable (struct usb_ep *_ep)
366 {
367 struct dummy_ep *ep;
368 struct dummy *dum;
369 unsigned long flags;
370 int retval;
371
372 ep = usb_ep_to_dummy_ep (_ep);
373 if (!_ep || !ep->desc || _ep->name == ep0name)
374 return -EINVAL;
375 dum = ep_to_dummy (ep);
376
377 spin_lock_irqsave (&dum->lock, flags);
378 ep->desc = NULL;
379 retval = 0;
380 nuke (dum, ep);
381 spin_unlock_irqrestore (&dum->lock, flags);
382
383 dev_dbg (dummy_dev(dum), "disabled %s\n", _ep->name);
384 return retval;
385 }
386
387 static struct usb_request *
388 dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
389 {
390 struct dummy_ep *ep;
391 struct dummy_request *req;
392
393 if (!_ep)
394 return NULL;
395 ep = usb_ep_to_dummy_ep (_ep);
396
397 req = kmalloc (sizeof *req, mem_flags);
398 if (!req)
399 return NULL;
400 memset (req, 0, sizeof *req);
401 INIT_LIST_HEAD (&req->queue);
402 return &req->req;
403 }
404
405 static void
406 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
407 {
408 struct dummy_ep *ep;
409 struct dummy_request *req;
410
411 ep = usb_ep_to_dummy_ep (_ep);
412 if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
413 return;
414
415 req = usb_request_to_dummy_request (_req);
416 WARN_ON (!list_empty (&req->queue));
417 kfree (req);
418 }
419
420 static void *
421 dummy_alloc_buffer (
422 struct usb_ep *_ep,
423 unsigned bytes,
424 dma_addr_t *dma,
425 int mem_flags
426 ) {
427 char *retval;
428 struct dummy_ep *ep;
429 struct dummy *dum;
430
431 ep = usb_ep_to_dummy_ep (_ep);
432 dum = ep_to_dummy (ep);
433
434 if (!dum->driver)
435 return NULL;
436 retval = kmalloc (bytes, mem_flags);
437 *dma = (dma_addr_t) retval;
438 return retval;
439 }
440
441 static void
442 dummy_free_buffer (
443 struct usb_ep *_ep,
444 void *buf,
445 dma_addr_t dma,
446 unsigned bytes
447 ) {
448 if (bytes)
449 kfree (buf);
450 }
451
452 static void
453 fifo_complete (struct usb_ep *ep, struct usb_request *req)
454 {
455 }
456
457 static int
458 dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
459 {
460 struct dummy_ep *ep;
461 struct dummy_request *req;
462 struct dummy *dum;
463 unsigned long flags;
464
465 req = usb_request_to_dummy_request (_req);
466 if (!_req || !list_empty (&req->queue) || !_req->complete)
467 return -EINVAL;
468
469 ep = usb_ep_to_dummy_ep (_ep);
470 if (!_ep || (!ep->desc && _ep->name != ep0name))
471 return -EINVAL;
472
473 dum = ep_to_dummy (ep);
474 if (!dum->driver || !is_enabled (dum))
475 return -ESHUTDOWN;
476
477 #if 0
478 dev_dbg (dummy_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
479 ep, _req, _ep->name, _req->length, _req->buf);
480 #endif
481
482 _req->status = -EINPROGRESS;
483 _req->actual = 0;
484 spin_lock_irqsave (&dum->lock, flags);
485
486 /* implement an emulated single-request FIFO */
487 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
488 list_empty (&dum->fifo_req.queue) &&
489 list_empty (&ep->queue) &&
490 _req->length <= FIFO_SIZE) {
491 req = &dum->fifo_req;
492 req->req = *_req;
493 req->req.buf = dum->fifo_buf;
494 memcpy (dum->fifo_buf, _req->buf, _req->length);
495 req->req.context = dum;
496 req->req.complete = fifo_complete;
497
498 spin_unlock (&dum->lock);
499 _req->actual = _req->length;
500 _req->status = 0;
501 _req->complete (_ep, _req);
502 spin_lock (&dum->lock);
503 }
504 list_add_tail (&req->queue, &ep->queue);
505 spin_unlock_irqrestore (&dum->lock, flags);
506
507 /* real hardware would likely enable transfers here, in case
508 * it'd been left NAKing.
509 */
510 return 0;
511 }
512
513 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
514 {
515 struct dummy_ep *ep;
516 struct dummy *dum;
517 int retval = -EINVAL;
518 unsigned long flags;
519 struct dummy_request *req = NULL;
520
521 if (!_ep || !_req)
522 return retval;
523 ep = usb_ep_to_dummy_ep (_ep);
524 dum = ep_to_dummy (ep);
525
526 if (!dum->driver)
527 return -ESHUTDOWN;
528
529 spin_lock_irqsave (&dum->lock, flags);
530 list_for_each_entry (req, &ep->queue, queue) {
531 if (&req->req == _req) {
532 list_del_init (&req->queue);
533 _req->status = -ECONNRESET;
534 retval = 0;
535 break;
536 }
537 }
538 spin_unlock_irqrestore (&dum->lock, flags);
539
540 if (retval == 0) {
541 dev_dbg (dummy_dev(dum),
542 "dequeued req %p from %s, len %d buf %p\n",
543 req, _ep->name, _req->length, _req->buf);
544 _req->complete (_ep, _req);
545 }
546 return retval;
547 }
548
549 static int
550 dummy_set_halt (struct usb_ep *_ep, int value)
551 {
552 struct dummy_ep *ep;
553 struct dummy *dum;
554
555 if (!_ep)
556 return -EINVAL;
557 ep = usb_ep_to_dummy_ep (_ep);
558 dum = ep_to_dummy (ep);
559 if (!dum->driver)
560 return -ESHUTDOWN;
561 if (!value)
562 ep->halted = 0;
563 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
564 !list_empty (&ep->queue))
565 return -EAGAIN;
566 else
567 ep->halted = 1;
568 /* FIXME clear emulated data toggle too */
569 return 0;
570 }
571
572 static const struct usb_ep_ops dummy_ep_ops = {
573 .enable = dummy_enable,
574 .disable = dummy_disable,
575
576 .alloc_request = dummy_alloc_request,
577 .free_request = dummy_free_request,
578
579 .alloc_buffer = dummy_alloc_buffer,
580 .free_buffer = dummy_free_buffer,
581 /* map, unmap, ... eventually hook the "generic" dma calls */
582
583 .queue = dummy_queue,
584 .dequeue = dummy_dequeue,
585
586 .set_halt = dummy_set_halt,
587 };
588
589 /*-------------------------------------------------------------------------*/
590
591 /* there are both host and device side versions of this call ... */
592 static int dummy_g_get_frame (struct usb_gadget *_gadget)
593 {
594 struct timeval tv;
595
596 do_gettimeofday (&tv);
597 return tv.tv_usec / 1000;
598 }
599
600 static int dummy_wakeup (struct usb_gadget *_gadget)
601 {
602 struct dummy *dum;
603
604 dum = gadget_to_dummy (_gadget);
605 if ((dum->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) == 0
606 || !(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)))
607 return -EINVAL;
608
609 /* hub notices our request, issues downstream resume, etc */
610 dum->resuming = 1;
611 dum->port_status |= (1 << USB_PORT_FEAT_C_SUSPEND);
612 return 0;
613 }
614
615 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
616 {
617 struct dummy *dum;
618
619 dum = gadget_to_dummy (_gadget);
620 if (value)
621 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
622 else
623 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
624 return 0;
625 }
626
627 static const struct usb_gadget_ops dummy_ops = {
628 .get_frame = dummy_g_get_frame,
629 .wakeup = dummy_wakeup,
630 .set_selfpowered = dummy_set_selfpowered,
631 };
632
633 /*-------------------------------------------------------------------------*/
634
635 /* "function" sysfs attribute */
636 static ssize_t
637 show_function (struct device *dev, char *buf)
638 {
639 struct dummy *dum = gadget_dev_to_dummy (dev);
640
641 if (!dum->driver || !dum->driver->function)
642 return 0;
643 return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
644 }
645 DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
646
647 /*-------------------------------------------------------------------------*/
648
649 /*
650 * Driver registration/unregistration.
651 *
652 * This is basically hardware-specific; there's usually only one real USB
653 * device (not host) controller since that's how USB devices are intended
654 * to work. So most implementations of these api calls will rely on the
655 * fact that only one driver will ever bind to the hardware. But curious
656 * hardware can be built with discrete components, so the gadget API doesn't
657 * require that assumption.
658 *
659 * For this emulator, it might be convenient to create a usb slave device
660 * for each driver that registers: just add to a big root hub.
661 */
662
663 static void
664 dummy_udc_release (struct device *dev)
665 {
666 }
667
668 static void
669 dummy_pdev_release (struct device *dev)
670 {
671 }
672
673 static int
674 dummy_register_udc (struct dummy *dum)
675 {
676 int rc;
677
678 strcpy (dum->gadget.dev.bus_id, "udc");
679 dum->gadget.dev.parent = dummy_dev(dum);
680 dum->gadget.dev.release = dummy_udc_release;
681
682 rc = device_register (&dum->gadget.dev);
683 if (rc == 0)
684 device_create_file (&dum->gadget.dev, &dev_attr_function);
685 return rc;
686 }
687
688 static void
689 dummy_unregister_udc (struct dummy *dum)
690 {
691 device_remove_file (&dum->gadget.dev, &dev_attr_function);
692 device_unregister (&dum->gadget.dev);
693 }
694
695 int
696 usb_gadget_register_driver (struct usb_gadget_driver *driver)
697 {
698 struct dummy *dum = the_controller;
699 int retval, i;
700
701 if (!dum)
702 return -EINVAL;
703 if (dum->driver)
704 return -EBUSY;
705 if (!driver->bind || !driver->unbind || !driver->setup
706 || driver->speed == USB_SPEED_UNKNOWN)
707 return -EINVAL;
708
709 /*
710 * SLAVE side init ... the layer above hardware, which
711 * can't enumerate without help from the driver we're binding.
712 */
713 dum->gadget.name = gadget_name;
714 dum->gadget.ops = &dummy_ops;
715 dum->gadget.is_dualspeed = 1;
716
717 dum->devstatus = 0;
718 dum->resuming = 0;
719
720 INIT_LIST_HEAD (&dum->gadget.ep_list);
721 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
722 struct dummy_ep *ep = &dum->ep [i];
723
724 if (!ep_name [i])
725 break;
726 ep->ep.name = ep_name [i];
727 ep->ep.ops = &dummy_ep_ops;
728 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
729 ep->halted = ep->already_seen = ep->setup_stage = 0;
730 ep->ep.maxpacket = ~0;
731 ep->last_io = jiffies;
732 ep->gadget = &dum->gadget;
733 ep->desc = NULL;
734 INIT_LIST_HEAD (&ep->queue);
735 }
736
737 dum->gadget.ep0 = &dum->ep [0].ep;
738 dum->ep [0].ep.maxpacket = 64;
739 list_del_init (&dum->ep [0].ep.ep_list);
740 INIT_LIST_HEAD(&dum->fifo_req.queue);
741
742 dum->driver = driver;
743 dum->gadget.dev.driver = &driver->driver;
744 dev_dbg (dummy_dev(dum), "binding gadget driver '%s'\n",
745 driver->driver.name);
746 if ((retval = driver->bind (&dum->gadget)) != 0) {
747 dum->driver = NULL;
748 dum->gadget.dev.driver = NULL;
749 return retval;
750 }
751
752 // FIXME: Check these calls for errors and re-order
753 driver->driver.bus = dum->gadget.dev.parent->bus;
754 driver_register (&driver->driver);
755
756 device_bind_driver (&dum->gadget.dev);
757
758 /* khubd will enumerate this in a while */
759 dum->port_status |= USB_PORT_STAT_CONNECTION
760 | (1 << USB_PORT_FEAT_C_CONNECTION);
761 return 0;
762 }
763 EXPORT_SYMBOL (usb_gadget_register_driver);
764
765 /* caller must hold lock */
766 static void
767 stop_activity (struct dummy *dum, struct usb_gadget_driver *driver)
768 {
769 struct dummy_ep *ep;
770
771 /* prevent any more requests */
772 dum->address = 0;
773
774 /* The timer is left running so that outstanding URBs can fail */
775
776 /* nuke any pending requests first, so driver i/o is quiesced */
777 list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
778 nuke (dum, ep);
779
780 /* driver now does any non-usb quiescing necessary */
781 if (driver) {
782 spin_unlock (&dum->lock);
783 driver->disconnect (&dum->gadget);
784 spin_lock (&dum->lock);
785 }
786 }
787
788 int
789 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
790 {
791 struct dummy *dum = the_controller;
792 unsigned long flags;
793
794 if (!dum)
795 return -ENODEV;
796 if (!driver || driver != dum->driver)
797 return -EINVAL;
798
799 dev_dbg (dummy_dev(dum), "unregister gadget driver '%s'\n",
800 driver->driver.name);
801
802 spin_lock_irqsave (&dum->lock, flags);
803 stop_activity (dum, driver);
804 dum->port_status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE |
805 USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED);
806 dum->port_status |= (1 << USB_PORT_FEAT_C_CONNECTION);
807 spin_unlock_irqrestore (&dum->lock, flags);
808
809 driver->unbind (&dum->gadget);
810 dum->driver = NULL;
811
812 device_release_driver (&dum->gadget.dev);
813
814 driver_unregister (&driver->driver);
815
816 return 0;
817 }
818 EXPORT_SYMBOL (usb_gadget_unregister_driver);
819
820 #undef is_enabled
821
822 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
823 {
824 return -ENOSYS;
825 }
826 EXPORT_SYMBOL (net2280_set_fifo_mode);
827
828 /*-------------------------------------------------------------------------*/
829
830 /* MASTER/HOST SIDE DRIVER
831 *
832 * this uses the hcd framework to hook up to host side drivers.
833 * its root hub will only have one device, otherwise it acts like
834 * a normal host controller.
835 *
836 * when urbs are queued, they're just stuck on a list that we
837 * scan in a timer callback. that callback connects writes from
838 * the host with reads from the device, and so on, based on the
839 * usb 2.0 rules.
840 */
841
842 static int dummy_urb_enqueue (
843 struct usb_hcd *hcd,
844 struct usb_host_endpoint *ep,
845 struct urb *urb,
846 int mem_flags
847 ) {
848 struct dummy *dum;
849 struct urbp *urbp;
850 unsigned long flags;
851
852 if (!urb->transfer_buffer && urb->transfer_buffer_length)
853 return -EINVAL;
854
855 urbp = kmalloc (sizeof *urbp, mem_flags);
856 if (!urbp)
857 return -ENOMEM;
858 urbp->urb = urb;
859
860 dum = hcd_to_dummy (hcd);
861 spin_lock_irqsave (&dum->lock, flags);
862
863 if (!dum->udev) {
864 dum->udev = urb->dev;
865 usb_get_dev (dum->udev);
866 } else if (unlikely (dum->udev != urb->dev))
867 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
868
869 list_add_tail (&urbp->urbp_list, &dum->urbp_list);
870 urb->hcpriv = urbp;
871 if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
872 urb->error_count = 1; /* mark as a new urb */
873
874 /* kick the scheduler, it'll do the rest */
875 if (!timer_pending (&dum->timer))
876 mod_timer (&dum->timer, jiffies + 1);
877
878 spin_unlock_irqrestore (&dum->lock, flags);
879 return 0;
880 }
881
882 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
883 {
884 /* giveback happens automatically in timer callback */
885 return 0;
886 }
887
888 static void maybe_set_status (struct urb *urb, int status)
889 {
890 spin_lock (&urb->lock);
891 if (urb->status == -EINPROGRESS)
892 urb->status = status;
893 spin_unlock (&urb->lock);
894 }
895
896 /* transfer up to a frame's worth; caller must own lock */
897 static int
898 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
899 {
900 struct dummy_request *req;
901
902 top:
903 /* if there's no request queued, the device is NAKing; return */
904 list_for_each_entry (req, &ep->queue, queue) {
905 unsigned host_len, dev_len, len;
906 int is_short, to_host;
907 int rescan = 0;
908
909 /* 1..N packets of ep->ep.maxpacket each ... the last one
910 * may be short (including zero length).
911 *
912 * writer can send a zlp explicitly (length 0) or implicitly
913 * (length mod maxpacket zero, and 'zero' flag); they always
914 * terminate reads.
915 */
916 host_len = urb->transfer_buffer_length - urb->actual_length;
917 dev_len = req->req.length - req->req.actual;
918 len = min (host_len, dev_len);
919
920 /* FIXME update emulated data toggle too */
921
922 to_host = usb_pipein (urb->pipe);
923 if (unlikely (len == 0))
924 is_short = 1;
925 else {
926 char *ubuf, *rbuf;
927
928 /* not enough bandwidth left? */
929 if (limit < ep->ep.maxpacket && limit < len)
930 break;
931 len = min (len, (unsigned) limit);
932 if (len == 0)
933 break;
934
935 /* use an extra pass for the final short packet */
936 if (len > ep->ep.maxpacket) {
937 rescan = 1;
938 len -= (len % ep->ep.maxpacket);
939 }
940 is_short = (len % ep->ep.maxpacket) != 0;
941
942 /* else transfer packet(s) */
943 ubuf = urb->transfer_buffer + urb->actual_length;
944 rbuf = req->req.buf + req->req.actual;
945 if (to_host)
946 memcpy (ubuf, rbuf, len);
947 else
948 memcpy (rbuf, ubuf, len);
949 ep->last_io = jiffies;
950
951 limit -= len;
952 urb->actual_length += len;
953 req->req.actual += len;
954 }
955
956 /* short packets terminate, maybe with overflow/underflow.
957 * it's only really an error to write too much.
958 *
959 * partially filling a buffer optionally blocks queue advances
960 * (so completion handlers can clean up the queue) but we don't
961 * need to emulate such data-in-flight. so we only show part
962 * of the URB_SHORT_NOT_OK effect: completion status.
963 */
964 if (is_short) {
965 if (host_len == dev_len) {
966 req->req.status = 0;
967 maybe_set_status (urb, 0);
968 } else if (to_host) {
969 req->req.status = 0;
970 if (dev_len > host_len)
971 maybe_set_status (urb, -EOVERFLOW);
972 else
973 maybe_set_status (urb,
974 (urb->transfer_flags
975 & URB_SHORT_NOT_OK)
976 ? -EREMOTEIO : 0);
977 } else if (!to_host) {
978 maybe_set_status (urb, 0);
979 if (host_len > dev_len)
980 req->req.status = -EOVERFLOW;
981 else
982 req->req.status = 0;
983 }
984
985 /* many requests terminate without a short packet */
986 } else {
987 if (req->req.length == req->req.actual
988 && !req->req.zero)
989 req->req.status = 0;
990 if (urb->transfer_buffer_length == urb->actual_length
991 && !(urb->transfer_flags
992 & URB_ZERO_PACKET)) {
993 maybe_set_status (urb, 0);
994 }
995 }
996
997 /* device side completion --> continuable */
998 if (req->req.status != -EINPROGRESS) {
999 list_del_init (&req->queue);
1000
1001 spin_unlock (&dum->lock);
1002 req->req.complete (&ep->ep, &req->req);
1003 spin_lock (&dum->lock);
1004
1005 /* requests might have been unlinked... */
1006 rescan = 1;
1007 }
1008
1009 /* host side completion --> terminate */
1010 if (urb->status != -EINPROGRESS)
1011 break;
1012
1013 /* rescan to continue with any other queued i/o */
1014 if (rescan)
1015 goto top;
1016 }
1017 return limit;
1018 }
1019
1020 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1021 {
1022 int limit = ep->ep.maxpacket;
1023
1024 if (dum->gadget.speed == USB_SPEED_HIGH) {
1025 int tmp;
1026
1027 /* high bandwidth mode */
1028 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1029 tmp = le16_to_cpu (tmp);
1030 tmp = (tmp >> 11) & 0x03;
1031 tmp *= 8 /* applies to entire frame */;
1032 limit += limit * tmp;
1033 }
1034 return limit;
1035 }
1036
1037 #define is_active(dum) ((dum->port_status & \
1038 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1039 USB_PORT_STAT_SUSPEND)) \
1040 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1041
1042 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1043 {
1044 int i;
1045
1046 if (!is_active (dum))
1047 return NULL;
1048 if ((address & ~USB_DIR_IN) == 0)
1049 return &dum->ep [0];
1050 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1051 struct dummy_ep *ep = &dum->ep [i];
1052
1053 if (!ep->desc)
1054 continue;
1055 if (ep->desc->bEndpointAddress == address)
1056 return ep;
1057 }
1058 return NULL;
1059 }
1060
1061 #undef is_active
1062
1063 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1064 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1065 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1066 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1067 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1068 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1069
1070 /* drive both sides of the transfers; looks like irq handlers to
1071 * both drivers except the callbacks aren't in_irq().
1072 */
1073 static void dummy_timer (unsigned long _dum)
1074 {
1075 struct dummy *dum = (struct dummy *) _dum;
1076 struct urbp *urbp, *tmp;
1077 unsigned long flags;
1078 int limit, total;
1079 int i;
1080
1081 /* simplistic model for one frame's bandwidth */
1082 switch (dum->gadget.speed) {
1083 case USB_SPEED_LOW:
1084 total = 8/*bytes*/ * 12/*packets*/;
1085 break;
1086 case USB_SPEED_FULL:
1087 total = 64/*bytes*/ * 19/*packets*/;
1088 break;
1089 case USB_SPEED_HIGH:
1090 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1091 break;
1092 default:
1093 dev_err (dummy_dev(dum), "bogus device speed\n");
1094 return;
1095 }
1096
1097 /* FIXME if HZ != 1000 this will probably misbehave ... */
1098
1099 /* look at each urb queued by the host side driver */
1100 spin_lock_irqsave (&dum->lock, flags);
1101
1102 if (!dum->udev) {
1103 dev_err (dummy_dev(dum),
1104 "timer fired with no URBs pending?\n");
1105 spin_unlock_irqrestore (&dum->lock, flags);
1106 return;
1107 }
1108
1109 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1110 if (!ep_name [i])
1111 break;
1112 dum->ep [i].already_seen = 0;
1113 }
1114
1115 restart:
1116 list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1117 struct urb *urb;
1118 struct dummy_request *req;
1119 u8 address;
1120 struct dummy_ep *ep = NULL;
1121 int type;
1122
1123 urb = urbp->urb;
1124 if (urb->status != -EINPROGRESS) {
1125 /* likely it was just unlinked */
1126 goto return_urb;
1127 }
1128 type = usb_pipetype (urb->pipe);
1129
1130 /* used up this frame's non-periodic bandwidth?
1131 * FIXME there's infinite bandwidth for control and
1132 * periodic transfers ... unrealistic.
1133 */
1134 if (total <= 0 && type == PIPE_BULK)
1135 continue;
1136
1137 /* find the gadget's ep for this request (if configured) */
1138 address = usb_pipeendpoint (urb->pipe);
1139 if (usb_pipein (urb->pipe))
1140 address |= USB_DIR_IN;
1141 ep = find_endpoint(dum, address);
1142 if (!ep) {
1143 /* set_configuration() disagreement */
1144 dev_dbg (dummy_dev(dum),
1145 "no ep configured for urb %p\n",
1146 urb);
1147 maybe_set_status (urb, -EPROTO);
1148 goto return_urb;
1149 }
1150
1151 if (ep->already_seen)
1152 continue;
1153 ep->already_seen = 1;
1154 if (ep == &dum->ep [0] && urb->error_count) {
1155 ep->setup_stage = 1; /* a new urb */
1156 urb->error_count = 0;
1157 }
1158 if (ep->halted && !ep->setup_stage) {
1159 /* NOTE: must not be iso! */
1160 dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1161 ep->ep.name, urb);
1162 maybe_set_status (urb, -EPIPE);
1163 goto return_urb;
1164 }
1165 /* FIXME make sure both ends agree on maxpacket */
1166
1167 /* handle control requests */
1168 if (ep == &dum->ep [0] && ep->setup_stage) {
1169 struct usb_ctrlrequest setup;
1170 int value = 1;
1171 struct dummy_ep *ep2;
1172
1173 setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1174 le16_to_cpus (&setup.wIndex);
1175 le16_to_cpus (&setup.wValue);
1176 le16_to_cpus (&setup.wLength);
1177 if (setup.wLength != urb->transfer_buffer_length) {
1178 maybe_set_status (urb, -EOVERFLOW);
1179 goto return_urb;
1180 }
1181
1182 /* paranoia, in case of stale queued data */
1183 list_for_each_entry (req, &ep->queue, queue) {
1184 list_del_init (&req->queue);
1185 req->req.status = -EOVERFLOW;
1186 dev_dbg (dummy_dev(dum), "stale req = %p\n",
1187 req);
1188
1189 spin_unlock (&dum->lock);
1190 req->req.complete (&ep->ep, &req->req);
1191 spin_lock (&dum->lock);
1192 ep->already_seen = 0;
1193 goto restart;
1194 }
1195
1196 /* gadget driver never sees set_address or operations
1197 * on standard feature flags. some hardware doesn't
1198 * even expose them.
1199 */
1200 ep->last_io = jiffies;
1201 ep->setup_stage = 0;
1202 ep->halted = 0;
1203 switch (setup.bRequest) {
1204 case USB_REQ_SET_ADDRESS:
1205 if (setup.bRequestType != Dev_Request)
1206 break;
1207 dum->address = setup.wValue;
1208 maybe_set_status (urb, 0);
1209 dev_dbg (dummy_dev(dum), "set_address = %d\n",
1210 setup.wValue);
1211 value = 0;
1212 break;
1213 case USB_REQ_SET_FEATURE:
1214 if (setup.bRequestType == Dev_Request) {
1215 value = 0;
1216 switch (setup.wValue) {
1217 case USB_DEVICE_REMOTE_WAKEUP:
1218 break;
1219 default:
1220 value = -EOPNOTSUPP;
1221 }
1222 if (value == 0) {
1223 dum->devstatus |=
1224 (1 << setup.wValue);
1225 maybe_set_status (urb, 0);
1226 }
1227
1228 } else if (setup.bRequestType == Ep_Request) {
1229 // endpoint halt
1230 ep2 = find_endpoint (dum,
1231 setup.wIndex);
1232 if (!ep2) {
1233 value = -EOPNOTSUPP;
1234 break;
1235 }
1236 ep2->halted = 1;
1237 value = 0;
1238 maybe_set_status (urb, 0);
1239 }
1240 break;
1241 case USB_REQ_CLEAR_FEATURE:
1242 if (setup.bRequestType == Dev_Request) {
1243 switch (setup.wValue) {
1244 case USB_DEVICE_REMOTE_WAKEUP:
1245 dum->devstatus &= ~(1 <<
1246 USB_DEVICE_REMOTE_WAKEUP);
1247 value = 0;
1248 maybe_set_status (urb, 0);
1249 break;
1250 default:
1251 value = -EOPNOTSUPP;
1252 break;
1253 }
1254 } else if (setup.bRequestType == Ep_Request) {
1255 // endpoint halt
1256 ep2 = find_endpoint (dum,
1257 setup.wIndex);
1258 if (!ep2) {
1259 value = -EOPNOTSUPP;
1260 break;
1261 }
1262 ep2->halted = 0;
1263 value = 0;
1264 maybe_set_status (urb, 0);
1265 }
1266 break;
1267 case USB_REQ_GET_STATUS:
1268 if (setup.bRequestType == Dev_InRequest
1269 || setup.bRequestType
1270 == Intf_InRequest
1271 || setup.bRequestType
1272 == Ep_InRequest
1273 ) {
1274 char *buf;
1275
1276 // device: remote wakeup, selfpowered
1277 // interface: nothing
1278 // endpoint: halt
1279 buf = (char *)urb->transfer_buffer;
1280 if (urb->transfer_buffer_length > 0) {
1281 if (setup.bRequestType ==
1282 Ep_InRequest) {
1283 ep2 = find_endpoint (dum, setup.wIndex);
1284 if (!ep2) {
1285 value = -EOPNOTSUPP;
1286 break;
1287 }
1288 buf [0] = ep2->halted;
1289 } else if (setup.bRequestType ==
1290 Dev_InRequest) {
1291 buf [0] = (u8)
1292 dum->devstatus;
1293 } else
1294 buf [0] = 0;
1295 }
1296 if (urb->transfer_buffer_length > 1)
1297 buf [1] = 0;
1298 urb->actual_length = min (2,
1299 urb->transfer_buffer_length);
1300 value = 0;
1301 maybe_set_status (urb, 0);
1302 }
1303 break;
1304 }
1305
1306 /* gadget driver handles all other requests. block
1307 * until setup() returns; no reentrancy issues etc.
1308 */
1309 if (value > 0) {
1310 spin_unlock (&dum->lock);
1311 value = dum->driver->setup (&dum->gadget,
1312 &setup);
1313 spin_lock (&dum->lock);
1314
1315 if (value >= 0) {
1316 /* no delays (max 64KB data stage) */
1317 limit = 64*1024;
1318 goto treat_control_like_bulk;
1319 }
1320 /* error, see below */
1321 }
1322
1323 if (value < 0) {
1324 if (value != -EOPNOTSUPP)
1325 dev_dbg (dummy_dev(dum),
1326 "setup --> %d\n",
1327 value);
1328 maybe_set_status (urb, -EPIPE);
1329 urb->actual_length = 0;
1330 }
1331
1332 goto return_urb;
1333 }
1334
1335 /* non-control requests */
1336 limit = total;
1337 switch (usb_pipetype (urb->pipe)) {
1338 case PIPE_ISOCHRONOUS:
1339 /* FIXME is it urb->interval since the last xfer?
1340 * use urb->iso_frame_desc[i].
1341 * complete whether or not ep has requests queued.
1342 * report random errors, to debug drivers.
1343 */
1344 limit = max (limit, periodic_bytes (dum, ep));
1345 maybe_set_status (urb, -ENOSYS);
1346 break;
1347
1348 case PIPE_INTERRUPT:
1349 /* FIXME is it urb->interval since the last xfer?
1350 * this almost certainly polls too fast.
1351 */
1352 limit = max (limit, periodic_bytes (dum, ep));
1353 /* FALLTHROUGH */
1354
1355 // case PIPE_BULK: case PIPE_CONTROL:
1356 default:
1357 treat_control_like_bulk:
1358 ep->last_io = jiffies;
1359 total = transfer (dum, urb, ep, limit);
1360 break;
1361 }
1362
1363 /* incomplete transfer? */
1364 if (urb->status == -EINPROGRESS)
1365 continue;
1366
1367 return_urb:
1368 urb->hcpriv = NULL;
1369 list_del (&urbp->urbp_list);
1370 kfree (urbp);
1371 if (ep)
1372 ep->already_seen = ep->setup_stage = 0;
1373
1374 spin_unlock (&dum->lock);
1375 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1376 spin_lock (&dum->lock);
1377
1378 goto restart;
1379 }
1380
1381 /* want a 1 msec delay here */
1382 if (!list_empty (&dum->urbp_list))
1383 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1384 else {
1385 usb_put_dev (dum->udev);
1386 dum->udev = NULL;
1387 }
1388
1389 spin_unlock_irqrestore (&dum->lock, flags);
1390 }
1391
1392 /*-------------------------------------------------------------------------*/
1393
1394 #define PORT_C_MASK \
1395 ((1 << USB_PORT_FEAT_C_CONNECTION) \
1396 | (1 << USB_PORT_FEAT_C_ENABLE) \
1397 | (1 << USB_PORT_FEAT_C_SUSPEND) \
1398 | (1 << USB_PORT_FEAT_C_OVER_CURRENT) \
1399 | (1 << USB_PORT_FEAT_C_RESET))
1400
1401 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1402 {
1403 struct dummy *dum;
1404 unsigned long flags;
1405 int retval;
1406
1407 dum = hcd_to_dummy (hcd);
1408
1409 spin_lock_irqsave (&dum->lock, flags);
1410 if (!(dum->port_status & PORT_C_MASK))
1411 retval = 0;
1412 else {
1413 *buf = (1 << 1);
1414 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1415 dum->port_status);
1416 retval = 1;
1417 }
1418 spin_unlock_irqrestore (&dum->lock, flags);
1419 return retval;
1420 }
1421
1422 static inline void
1423 hub_descriptor (struct usb_hub_descriptor *desc)
1424 {
1425 memset (desc, 0, sizeof *desc);
1426 desc->bDescriptorType = 0x29;
1427 desc->bDescLength = 9;
1428 desc->wHubCharacteristics = __constant_cpu_to_le16 (0x0001);
1429 desc->bNbrPorts = 1;
1430 desc->bitmap [0] = 0xff;
1431 desc->bitmap [1] = 0xff;
1432 }
1433
1434 static int dummy_hub_control (
1435 struct usb_hcd *hcd,
1436 u16 typeReq,
1437 u16 wValue,
1438 u16 wIndex,
1439 char *buf,
1440 u16 wLength
1441 ) {
1442 struct dummy *dum;
1443 int retval = 0;
1444 unsigned long flags;
1445
1446 dum = hcd_to_dummy (hcd);
1447 spin_lock_irqsave (&dum->lock, flags);
1448 switch (typeReq) {
1449 case ClearHubFeature:
1450 break;
1451 case ClearPortFeature:
1452 switch (wValue) {
1453 case USB_PORT_FEAT_SUSPEND:
1454 if (dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)) {
1455 /* 20msec resume signaling */
1456 dum->resuming = 1;
1457 dum->re_timeout = jiffies +
1458 msecs_to_jiffies(20);
1459 }
1460 break;
1461 case USB_PORT_FEAT_POWER:
1462 dum->port_status = 0;
1463 dum->resuming = 0;
1464 stop_activity(dum, dum->driver);
1465 break;
1466 default:
1467 dum->port_status &= ~(1 << wValue);
1468 }
1469 break;
1470 case GetHubDescriptor:
1471 hub_descriptor ((struct usb_hub_descriptor *) buf);
1472 break;
1473 case GetHubStatus:
1474 *(u32 *) buf = __constant_cpu_to_le32 (0);
1475 break;
1476 case GetPortStatus:
1477 if (wIndex != 1)
1478 retval = -EPIPE;
1479
1480 /* whoever resets or resumes must GetPortStatus to
1481 * complete it!!
1482 */
1483 if (dum->resuming && time_after (jiffies, dum->re_timeout)) {
1484 dum->port_status |= (1 << USB_PORT_FEAT_C_SUSPEND);
1485 dum->port_status &= ~(1 << USB_PORT_FEAT_SUSPEND);
1486 dum->resuming = 0;
1487 dum->re_timeout = 0;
1488 if (dum->driver && dum->driver->resume) {
1489 spin_unlock (&dum->lock);
1490 dum->driver->resume (&dum->gadget);
1491 spin_lock (&dum->lock);
1492 }
1493 }
1494 if ((dum->port_status & (1 << USB_PORT_FEAT_RESET)) != 0
1495 && time_after (jiffies, dum->re_timeout)) {
1496 dum->port_status |= (1 << USB_PORT_FEAT_C_RESET);
1497 dum->port_status &= ~(1 << USB_PORT_FEAT_RESET);
1498 dum->re_timeout = 0;
1499 if (dum->driver) {
1500 dum->port_status |= USB_PORT_STAT_ENABLE;
1501 /* give it the best speed we agree on */
1502 dum->gadget.speed = dum->driver->speed;
1503 dum->gadget.ep0->maxpacket = 64;
1504 switch (dum->gadget.speed) {
1505 case USB_SPEED_HIGH:
1506 dum->port_status |=
1507 USB_PORT_STAT_HIGH_SPEED;
1508 break;
1509 case USB_SPEED_LOW:
1510 dum->gadget.ep0->maxpacket = 8;
1511 dum->port_status |=
1512 USB_PORT_STAT_LOW_SPEED;
1513 break;
1514 default:
1515 dum->gadget.speed = USB_SPEED_FULL;
1516 break;
1517 }
1518 }
1519 }
1520 ((u16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1521 ((u16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1522 break;
1523 case SetHubFeature:
1524 retval = -EPIPE;
1525 break;
1526 case SetPortFeature:
1527 switch (wValue) {
1528 case USB_PORT_FEAT_SUSPEND:
1529 if ((dum->port_status & (1 << USB_PORT_FEAT_SUSPEND))
1530 == 0) {
1531 dum->port_status |=
1532 (1 << USB_PORT_FEAT_SUSPEND);
1533 if (dum->driver && dum->driver->suspend) {
1534 spin_unlock (&dum->lock);
1535 dum->driver->suspend (&dum->gadget);
1536 spin_lock (&dum->lock);
1537 }
1538 }
1539 break;
1540 case USB_PORT_FEAT_RESET:
1541 /* if it's already running, disconnect first */
1542 if (dum->port_status & USB_PORT_STAT_ENABLE) {
1543 dum->port_status &= ~(USB_PORT_STAT_ENABLE
1544 | USB_PORT_STAT_LOW_SPEED
1545 | USB_PORT_STAT_HIGH_SPEED);
1546 if (dum->driver) {
1547 dev_dbg (dummy_dev(dum),
1548 "disconnect\n");
1549 stop_activity (dum, dum->driver);
1550 }
1551
1552 /* FIXME test that code path! */
1553 }
1554 /* 50msec reset signaling */
1555 dum->re_timeout = jiffies + msecs_to_jiffies(50);
1556 /* FALLTHROUGH */
1557 default:
1558 dum->port_status |= (1 << wValue);
1559 }
1560 break;
1561
1562 default:
1563 dev_dbg (dummy_dev(dum),
1564 "hub control req%04x v%04x i%04x l%d\n",
1565 typeReq, wValue, wIndex, wLength);
1566
1567 /* "protocol stall" on error */
1568 retval = -EPIPE;
1569 }
1570 spin_unlock_irqrestore (&dum->lock, flags);
1571 return retval;
1572 }
1573
1574
1575 /*-------------------------------------------------------------------------*/
1576
1577 static inline ssize_t
1578 show_urb (char *buf, size_t size, struct urb *urb)
1579 {
1580 int ep = usb_pipeendpoint (urb->pipe);
1581
1582 return snprintf (buf, size,
1583 "urb/%p %s ep%d%s%s len %d/%d\n",
1584 urb,
1585 ({ char *s;
1586 switch (urb->dev->speed) {
1587 case USB_SPEED_LOW: s = "ls"; break;
1588 case USB_SPEED_FULL: s = "fs"; break;
1589 case USB_SPEED_HIGH: s = "hs"; break;
1590 default: s = "?"; break;
1591 }; s; }),
1592 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1593 ({ char *s; \
1594 switch (usb_pipetype (urb->pipe)) { \
1595 case PIPE_CONTROL: s = ""; break; \
1596 case PIPE_BULK: s = "-bulk"; break; \
1597 case PIPE_INTERRUPT: s = "-int"; break; \
1598 default: s = "-iso"; break; \
1599 }; s;}),
1600 urb->actual_length, urb->transfer_buffer_length);
1601 }
1602
1603 static ssize_t
1604 show_urbs (struct device *dev, char *buf)
1605 {
1606 struct usb_hcd *hcd = dev_get_drvdata (dev);
1607 struct dummy *dum = hcd_to_dummy (hcd);
1608 struct urbp *urbp;
1609 size_t size = 0;
1610 unsigned long flags;
1611
1612 spin_lock_irqsave (&dum->lock, flags);
1613 list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1614 size_t temp;
1615
1616 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1617 buf += temp;
1618 size += temp;
1619 }
1620 spin_unlock_irqrestore (&dum->lock, flags);
1621
1622 return size;
1623 }
1624 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1625
1626 static int dummy_start (struct usb_hcd *hcd)
1627 {
1628 struct dummy *dum;
1629 struct usb_device *root;
1630 int retval;
1631
1632 dum = hcd_to_dummy (hcd);
1633
1634 /*
1635 * MASTER side init ... we emulate a root hub that'll only ever
1636 * talk to one device (the slave side). Also appears in sysfs,
1637 * just like more familiar pci-based HCDs.
1638 */
1639 spin_lock_init (&dum->lock);
1640
1641 init_timer (&dum->timer);
1642 dum->timer.function = dummy_timer;
1643 dum->timer.data = (unsigned long) dum;
1644
1645 INIT_LIST_HEAD (&dum->urbp_list);
1646
1647 root = usb_alloc_dev (NULL, &hcd->self, 0);
1648 if (!root)
1649 return -ENOMEM;
1650
1651 /* root hub enters addressed state... */
1652 hcd->state = USB_STATE_RUNNING;
1653 root->speed = USB_SPEED_HIGH;
1654
1655 /* ...then configured, so khubd sees us. */
1656 if ((retval = hcd_register_root (root, hcd)) != 0) {
1657 usb_put_dev (root);
1658 clean:
1659 hcd->state = USB_STATE_QUIESCING;
1660 return retval;
1661 }
1662
1663 /* only show a low-power port: just 8mA */
1664 hub_set_power_budget (root, 8);
1665
1666 if ((retval = dummy_register_udc (dum)) != 0) {
1667 usb_disconnect (&hcd->self.root_hub);
1668 goto clean;
1669 }
1670
1671 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1672 device_create_file (dummy_dev(dum), &dev_attr_urbs);
1673
1674 dum->started = 1;
1675 return 0;
1676 }
1677
1678 static void dummy_stop (struct usb_hcd *hcd)
1679 {
1680 struct dummy *dum;
1681
1682 dum = hcd_to_dummy (hcd);
1683 if (!dum->started)
1684 return;
1685 dum->started = 0;
1686
1687 device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1688
1689 usb_gadget_unregister_driver (dum->driver);
1690 dummy_unregister_udc (dum);
1691
1692 dev_info (dummy_dev(dum), "stopped\n");
1693 }
1694
1695 /*-------------------------------------------------------------------------*/
1696
1697 static int dummy_h_get_frame (struct usb_hcd *hcd)
1698 {
1699 return dummy_g_get_frame (NULL);
1700 }
1701
1702 static const struct hc_driver dummy_hcd = {
1703 .description = (char *) driver_name,
1704 .product_desc = "Dummy host controller",
1705 .hcd_priv_size = sizeof(struct dummy),
1706
1707 .flags = HCD_USB2,
1708
1709 .start = dummy_start,
1710 .stop = dummy_stop,
1711
1712 .urb_enqueue = dummy_urb_enqueue,
1713 .urb_dequeue = dummy_urb_dequeue,
1714
1715 .get_frame_number = dummy_h_get_frame,
1716
1717 .hub_status_data = dummy_hub_status,
1718 .hub_control = dummy_hub_control,
1719 };
1720
1721 static void dummy_remove (struct device *dev);
1722
1723 static int dummy_probe (struct device *dev)
1724 {
1725 struct usb_hcd *hcd;
1726 struct dummy *dum;
1727 int retval;
1728
1729 dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1730
1731 hcd = usb_create_hcd (&dummy_hcd);
1732 if (hcd == NULL) {
1733 dev_dbg (dev, "hcd_alloc failed\n");
1734 return -ENOMEM;
1735 }
1736
1737 dev_set_drvdata (dev, hcd);
1738 dum = hcd_to_dummy (hcd);
1739 the_controller = dum;
1740
1741 hcd->self.controller = dev;
1742
1743 /* FIXME don't require the pci-based buffer/alloc impls;
1744 * the "generic dma" implementation still requires them,
1745 * it's not very generic yet.
1746 */
1747 retval = hcd_buffer_create (hcd);
1748 if (retval != 0) {
1749 dev_dbg (dev, "pool alloc failed\n");
1750 goto err1;
1751 }
1752
1753 hcd->self.bus_name = dev->bus_id;
1754 usb_register_bus (&hcd->self);
1755
1756 if ((retval = dummy_start (hcd)) < 0)
1757 dummy_remove (dev);
1758 return retval;
1759
1760 err1:
1761 usb_put_hcd (hcd);
1762 dev_set_drvdata (dev, NULL);
1763 return retval;
1764 }
1765
1766 static void dummy_remove (struct device *dev)
1767 {
1768 struct usb_hcd *hcd;
1769 struct dummy *dum;
1770
1771 hcd = dev_get_drvdata (dev);
1772 dum = hcd_to_dummy (hcd);
1773
1774 hcd->state = USB_STATE_QUIESCING;
1775
1776 dev_dbg (dev, "roothub graceful disconnect\n");
1777 usb_disconnect (&hcd->self.root_hub);
1778
1779 hcd->driver->stop (hcd);
1780 hcd->state = USB_STATE_HALT;
1781
1782 hcd_buffer_destroy (hcd);
1783
1784 dev_set_drvdata (dev, NULL);
1785 usb_deregister_bus (&hcd->self);
1786 the_controller = NULL;
1787 }
1788
1789 /*-------------------------------------------------------------------------*/
1790
1791 static int dummy_pdev_detect (void)
1792 {
1793 int retval;
1794
1795 retval = driver_register (&dummy_driver);
1796 if (retval < 0)
1797 return retval;
1798
1799 the_pdev.name = "hc";
1800 the_pdev.dev.driver = &dummy_driver;
1801 the_pdev.dev.release = dummy_pdev_release;
1802
1803 retval = platform_device_register (&the_pdev);
1804 if (retval < 0)
1805 driver_unregister (&dummy_driver);
1806 return retval;
1807 }
1808
1809 static void dummy_pdev_remove (void)
1810 {
1811 platform_device_unregister (&the_pdev);
1812 driver_unregister (&dummy_driver);
1813 }
1814
1815 /*-------------------------------------------------------------------------*/
1816
1817 static int __init init (void)
1818 {
1819 int retval;
1820
1821 if (usb_disabled ())
1822 return -ENODEV;
1823 if ((retval = dummy_pdev_detect ()) != 0)
1824 return retval;
1825 if ((retval = dummy_probe (&the_pdev.dev)) != 0)
1826 dummy_pdev_remove ();
1827 return retval;
1828 }
1829 module_init (init);
1830
1831 static void __exit cleanup (void)
1832 {
1833 dummy_remove (&the_pdev.dev);
1834 dummy_pdev_remove ();
1835 }
1836 module_exit (cleanup);
1837
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