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[PATCH] UFS: inode->i_sem is not released in error path
[linux-2.6/verdex.git] / drivers / usb / gadget / dummy_hcd.c
blob9734cb76dd6c24ff499204aa7ff5c60ecae7865f
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/platform_device.h>
53 #include <linux/usb.h>
54 #include <linux/usb_gadget.h>
55
56 #include <asm/byteorder.h>
57 #include <asm/io.h>
58 #include <asm/irq.h>
59 #include <asm/system.h>
60 #include <asm/unaligned.h>
61
62
63 #include "../core/hcd.h"
64
65
66 #define DRIVER_DESC "USB Host+Gadget Emulator"
67 #define DRIVER_VERSION "02 May 2005"
68
69 static const char driver_name [] = "dummy_hcd";
70 static const char driver_desc [] = "USB Host+Gadget Emulator";
71
72 static const char gadget_name [] = "dummy_udc";
73
74 MODULE_DESCRIPTION (DRIVER_DESC);
75 MODULE_AUTHOR ("David Brownell");
76 MODULE_LICENSE ("GPL");
77
78 /*-------------------------------------------------------------------------*/
79
80 /* gadget side driver data structres */
81 struct dummy_ep {
82 struct list_head queue;
83 unsigned long last_io; /* jiffies timestamp */
84 struct usb_gadget *gadget;
85 const struct usb_endpoint_descriptor *desc;
86 struct usb_ep ep;
87 unsigned halted : 1;
88 unsigned already_seen : 1;
89 unsigned setup_stage : 1;
90 };
91
92 struct dummy_request {
93 struct list_head queue; /* ep's requests */
94 struct usb_request req;
95 };
96
97 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
98 {
99 return container_of (_ep, struct dummy_ep, ep);
100 }
101
102 static inline struct dummy_request *usb_request_to_dummy_request
103 (struct usb_request *_req)
104 {
105 return container_of (_req, struct dummy_request, req);
106 }
107
108 /*-------------------------------------------------------------------------*/
109
110 /*
111 * Every device has ep0 for control requests, plus up to 30 more endpoints,
112 * in one of two types:
113 *
114 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
115 * number can be changed. Names like "ep-a" are used for this type.
116 *
117 * - Fixed Function: in other cases. some characteristics may be mutable;
118 * that'd be hardware-specific. Names like "ep12out-bulk" are used.
119 *
120 * Gadget drivers are responsible for not setting up conflicting endpoint
121 * configurations, illegal or unsupported packet lengths, and so on.
122 */
123
124 static const char ep0name [] = "ep0";
125
126 static const char *const ep_name [] = {
127 ep0name, /* everyone has ep0 */
128
129 /* act like a net2280: high speed, six configurable endpoints */
130 "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
131
132 /* or like pxa250: fifteen fixed function endpoints */
133 "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
134 "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
135 "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
136 "ep15in-int",
137
138 /* or like sa1100: two fixed function endpoints */
139 "ep1out-bulk", "ep2in-bulk",
140 };
141 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
142
143 /*-------------------------------------------------------------------------*/
144
145 #define FIFO_SIZE 64
146
147 struct urbp {
148 struct urb *urb;
149 struct list_head urbp_list;
150 };
151
152
153 enum dummy_rh_state {
154 DUMMY_RH_RESET,
155 DUMMY_RH_SUSPENDED,
156 DUMMY_RH_RUNNING
157 };
158
159 struct dummy {
160 spinlock_t lock;
161
162 /*
163 * SLAVE/GADGET side support
164 */
165 struct dummy_ep ep [DUMMY_ENDPOINTS];
166 int address;
167 struct usb_gadget gadget;
168 struct usb_gadget_driver *driver;
169 struct dummy_request fifo_req;
170 u8 fifo_buf [FIFO_SIZE];
171 u16 devstatus;
172 unsigned udc_suspended:1;
173 unsigned pullup:1;
174 unsigned active:1;
175 unsigned old_active:1;
176
177 /*
178 * MASTER/HOST side support
179 */
180 enum dummy_rh_state rh_state;
181 struct timer_list timer;
182 u32 port_status;
183 u32 old_status;
184 unsigned resuming:1;
185 unsigned long re_timeout;
186
187 struct usb_device *udev;
188 struct list_head urbp_list;
189 };
190
191 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
192 {
193 return (struct dummy *) (hcd->hcd_priv);
194 }
195
196 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
197 {
198 return container_of((void *) dum, struct usb_hcd, hcd_priv);
199 }
200
201 static inline struct device *dummy_dev (struct dummy *dum)
202 {
203 return dummy_to_hcd(dum)->self.controller;
204 }
205
206 static inline struct device *udc_dev (struct dummy *dum)
207 {
208 return dum->gadget.dev.parent;
209 }
210
211 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
212 {
213 return container_of (ep->gadget, struct dummy, gadget);
214 }
215
216 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
217 {
218 return container_of (gadget, struct dummy, gadget);
219 }
220
221 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
222 {
223 return container_of (dev, struct dummy, gadget.dev);
224 }
225
226 static struct dummy *the_controller;
227
228 /*-------------------------------------------------------------------------*/
229
230 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
231
232 /* called with spinlock held */
233 static void nuke (struct dummy *dum, struct dummy_ep *ep)
234 {
235 while (!list_empty (&ep->queue)) {
236 struct dummy_request *req;
237
238 req = list_entry (ep->queue.next, struct dummy_request, queue);
239 list_del_init (&req->queue);
240 req->req.status = -ESHUTDOWN;
241
242 spin_unlock (&dum->lock);
243 req->req.complete (&ep->ep, &req->req);
244 spin_lock (&dum->lock);
245 }
246 }
247
248 /* caller must hold lock */
249 static void
250 stop_activity (struct dummy *dum)
251 {
252 struct dummy_ep *ep;
253
254 /* prevent any more requests */
255 dum->address = 0;
256
257 /* The timer is left running so that outstanding URBs can fail */
258
259 /* nuke any pending requests first, so driver i/o is quiesced */
260 list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
261 nuke (dum, ep);
262
263 /* driver now does any non-usb quiescing necessary */
264 }
265
266 /* caller must hold lock */
267 static void
268 set_link_state (struct dummy *dum)
269 {
270 dum->active = 0;
271 if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
272 dum->port_status = 0;
273
274 /* UDC suspend must cause a disconnect */
275 else if (!dum->pullup || dum->udc_suspended) {
276 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
277 USB_PORT_STAT_ENABLE |
278 USB_PORT_STAT_LOW_SPEED |
279 USB_PORT_STAT_HIGH_SPEED |
280 USB_PORT_STAT_SUSPEND);
281 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
282 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
283 } else {
284 dum->port_status |= USB_PORT_STAT_CONNECTION;
285 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
286 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
287 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
288 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
289 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
290 dum->rh_state != DUMMY_RH_SUSPENDED)
291 dum->active = 1;
292 }
293
294 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
295 dum->resuming = 0;
296
297 if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
298 (dum->port_status & USB_PORT_STAT_RESET) != 0) {
299 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
300 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
301 dum->driver) {
302 stop_activity (dum);
303 spin_unlock (&dum->lock);
304 dum->driver->disconnect (&dum->gadget);
305 spin_lock (&dum->lock);
306 }
307 } else if (dum->active != dum->old_active) {
308 if (dum->old_active && dum->driver->suspend) {
309 spin_unlock (&dum->lock);
310 dum->driver->suspend (&dum->gadget);
311 spin_lock (&dum->lock);
312 } else if (!dum->old_active && dum->driver->resume) {
313 spin_unlock (&dum->lock);
314 dum->driver->resume (&dum->gadget);
315 spin_lock (&dum->lock);
316 }
317 }
318
319 dum->old_status = dum->port_status;
320 dum->old_active = dum->active;
321 }
322
323 /*-------------------------------------------------------------------------*/
324
325 /* SLAVE/GADGET SIDE DRIVER
326 *
327 * This only tracks gadget state. All the work is done when the host
328 * side tries some (emulated) i/o operation. Real device controller
329 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
330 */
331
332 #define is_enabled(dum) \
333 (dum->port_status & USB_PORT_STAT_ENABLE)
334
335 static int
336 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
337 {
338 struct dummy *dum;
339 struct dummy_ep *ep;
340 unsigned max;
341 int retval;
342
343 ep = usb_ep_to_dummy_ep (_ep);
344 if (!_ep || !desc || ep->desc || _ep->name == ep0name
345 || desc->bDescriptorType != USB_DT_ENDPOINT)
346 return -EINVAL;
347 dum = ep_to_dummy (ep);
348 if (!dum->driver || !is_enabled (dum))
349 return -ESHUTDOWN;
350 max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
351
352 /* drivers must not request bad settings, since lower levels
353 * (hardware or its drivers) may not check. some endpoints
354 * can't do iso, many have maxpacket limitations, etc.
355 *
356 * since this "hardware" driver is here to help debugging, we
357 * have some extra sanity checks. (there could be more though,
358 * especially for "ep9out" style fixed function ones.)
359 */
360 retval = -EINVAL;
361 switch (desc->bmAttributes & 0x03) {
362 case USB_ENDPOINT_XFER_BULK:
363 if (strstr (ep->ep.name, "-iso")
364 || strstr (ep->ep.name, "-int")) {
365 goto done;
366 }
367 switch (dum->gadget.speed) {
368 case USB_SPEED_HIGH:
369 if (max == 512)
370 break;
371 /* conserve return statements */
372 default:
373 switch (max) {
374 case 8: case 16: case 32: case 64:
375 /* we'll fake any legal size */
376 break;
377 default:
378 case USB_SPEED_LOW:
379 goto done;
380 }
381 }
382 break;
383 case USB_ENDPOINT_XFER_INT:
384 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
385 goto done;
386 /* real hardware might not handle all packet sizes */
387 switch (dum->gadget.speed) {
388 case USB_SPEED_HIGH:
389 if (max <= 1024)
390 break;
391 /* save a return statement */
392 case USB_SPEED_FULL:
393 if (max <= 64)
394 break;
395 /* save a return statement */
396 default:
397 if (max <= 8)
398 break;
399 goto done;
400 }
401 break;
402 case USB_ENDPOINT_XFER_ISOC:
403 if (strstr (ep->ep.name, "-bulk")
404 || strstr (ep->ep.name, "-int"))
405 goto done;
406 /* real hardware might not handle all packet sizes */
407 switch (dum->gadget.speed) {
408 case USB_SPEED_HIGH:
409 if (max <= 1024)
410 break;
411 /* save a return statement */
412 case USB_SPEED_FULL:
413 if (max <= 1023)
414 break;
415 /* save a return statement */
416 default:
417 goto done;
418 }
419 break;
420 default:
421 /* few chips support control except on ep0 */
422 goto done;
423 }
424
425 _ep->maxpacket = max;
426 ep->desc = desc;
427
428 dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
429 _ep->name,
430 desc->bEndpointAddress & 0x0f,
431 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
432 ({ char *val;
433 switch (desc->bmAttributes & 0x03) {
434 case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
435 case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
436 case USB_ENDPOINT_XFER_INT: val = "intr"; break;
437 default: val = "ctrl"; break;
438 }; val; }),
439 max);
440
441 /* at this point real hardware should be NAKing transfers
442 * to that endpoint, until a buffer is queued to it.
443 */
444 retval = 0;
445 done:
446 return retval;
447 }
448
449 static int dummy_disable (struct usb_ep *_ep)
450 {
451 struct dummy_ep *ep;
452 struct dummy *dum;
453 unsigned long flags;
454 int retval;
455
456 ep = usb_ep_to_dummy_ep (_ep);
457 if (!_ep || !ep->desc || _ep->name == ep0name)
458 return -EINVAL;
459 dum = ep_to_dummy (ep);
460
461 spin_lock_irqsave (&dum->lock, flags);
462 ep->desc = NULL;
463 retval = 0;
464 nuke (dum, ep);
465 spin_unlock_irqrestore (&dum->lock, flags);
466
467 dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
468 return retval;
469 }
470
471 static struct usb_request *
472 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
473 {
474 struct dummy_ep *ep;
475 struct dummy_request *req;
476
477 if (!_ep)
478 return NULL;
479 ep = usb_ep_to_dummy_ep (_ep);
480
481 req = kmalloc (sizeof *req, mem_flags);
482 if (!req)
483 return NULL;
484 memset (req, 0, sizeof *req);
485 INIT_LIST_HEAD (&req->queue);
486 return &req->req;
487 }
488
489 static void
490 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
491 {
492 struct dummy_ep *ep;
493 struct dummy_request *req;
494
495 ep = usb_ep_to_dummy_ep (_ep);
496 if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
497 return;
498
499 req = usb_request_to_dummy_request (_req);
500 WARN_ON (!list_empty (&req->queue));
501 kfree (req);
502 }
503
504 static void *
505 dummy_alloc_buffer (
506 struct usb_ep *_ep,
507 unsigned bytes,
508 dma_addr_t *dma,
509 gfp_t mem_flags
510 ) {
511 char *retval;
512 struct dummy_ep *ep;
513 struct dummy *dum;
514
515 ep = usb_ep_to_dummy_ep (_ep);
516 dum = ep_to_dummy (ep);
517
518 if (!dum->driver)
519 return NULL;
520 retval = kmalloc (bytes, mem_flags);
521 *dma = (dma_addr_t) retval;
522 return retval;
523 }
524
525 static void
526 dummy_free_buffer (
527 struct usb_ep *_ep,
528 void *buf,
529 dma_addr_t dma,
530 unsigned bytes
531 ) {
532 if (bytes)
533 kfree (buf);
534 }
535
536 static void
537 fifo_complete (struct usb_ep *ep, struct usb_request *req)
538 {
539 }
540
541 static int
542 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
543 gfp_t 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 platform_device *pdev)
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 = &pdev->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 platform_set_drvdata (pdev, dum);
923 device_create_file (&dum->gadget.dev, &dev_attr_function);
924 return rc;
925 }
926
927 static int dummy_udc_remove (struct platform_device *pdev)
928 {
929 struct dummy *dum = platform_get_drvdata (pdev);
930
931 platform_set_drvdata (pdev, 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 platform_device *pdev, pm_message_t state)
938 {
939 struct dummy *dum = platform_get_drvdata(pdev);
940
941 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
942 spin_lock_irq (&dum->lock);
943 dum->udc_suspended = 1;
944 set_link_state (dum);
945 spin_unlock_irq (&dum->lock);
946
947 pdev->dev.power.power_state = state;
948 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
949 return 0;
950 }
951
952 static int dummy_udc_resume (struct platform_device *pdev)
953 {
954 struct dummy *dum = platform_get_drvdata(pdev);
955
956 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
957 spin_lock_irq (&dum->lock);
958 dum->udc_suspended = 0;
959 set_link_state (dum);
960 spin_unlock_irq (&dum->lock);
961
962 pdev->dev.power.power_state = PMSG_ON;
963 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
964 return 0;
965 }
966
967 static struct platform_driver dummy_udc_driver = {
968 .probe = dummy_udc_probe,
969 .remove = dummy_udc_remove,
970 .suspend = dummy_udc_suspend,
971 .resume = dummy_udc_resume,
972 .driver = {
973 .name = (char *) gadget_name,
974 .owner = THIS_MODULE,
975 },
976 };
977
978 /*-------------------------------------------------------------------------*/
979
980 /* MASTER/HOST SIDE DRIVER
981 *
982 * this uses the hcd framework to hook up to host side drivers.
983 * its root hub will only have one device, otherwise it acts like
984 * a normal host controller.
985 *
986 * when urbs are queued, they're just stuck on a list that we
987 * scan in a timer callback. that callback connects writes from
988 * the host with reads from the device, and so on, based on the
989 * usb 2.0 rules.
990 */
991
992 static int dummy_urb_enqueue (
993 struct usb_hcd *hcd,
994 struct usb_host_endpoint *ep,
995 struct urb *urb,
996 gfp_t mem_flags
997 ) {
998 struct dummy *dum;
999 struct urbp *urbp;
1000 unsigned long flags;
1001
1002 if (!urb->transfer_buffer && urb->transfer_buffer_length)
1003 return -EINVAL;
1004
1005 urbp = kmalloc (sizeof *urbp, mem_flags);
1006 if (!urbp)
1007 return -ENOMEM;
1008 urbp->urb = urb;
1009
1010 dum = hcd_to_dummy (hcd);
1011 spin_lock_irqsave (&dum->lock, flags);
1012
1013 if (!dum->udev) {
1014 dum->udev = urb->dev;
1015 usb_get_dev (dum->udev);
1016 } else if (unlikely (dum->udev != urb->dev))
1017 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1018
1019 list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1020 urb->hcpriv = urbp;
1021 if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1022 urb->error_count = 1; /* mark as a new urb */
1023
1024 /* kick the scheduler, it'll do the rest */
1025 if (!timer_pending (&dum->timer))
1026 mod_timer (&dum->timer, jiffies + 1);
1027
1028 spin_unlock_irqrestore (&dum->lock, flags);
1029 return 0;
1030 }
1031
1032 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1033 {
1034 struct dummy *dum;
1035 unsigned long flags;
1036
1037 /* giveback happens automatically in timer callback,
1038 * so make sure the callback happens */
1039 dum = hcd_to_dummy (hcd);
1040 spin_lock_irqsave (&dum->lock, flags);
1041 if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1042 mod_timer (&dum->timer, jiffies);
1043 spin_unlock_irqrestore (&dum->lock, flags);
1044 return 0;
1045 }
1046
1047 static void maybe_set_status (struct urb *urb, int status)
1048 {
1049 spin_lock (&urb->lock);
1050 if (urb->status == -EINPROGRESS)
1051 urb->status = status;
1052 spin_unlock (&urb->lock);
1053 }
1054
1055 /* transfer up to a frame's worth; caller must own lock */
1056 static int
1057 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1058 {
1059 struct dummy_request *req;
1060
1061 top:
1062 /* if there's no request queued, the device is NAKing; return */
1063 list_for_each_entry (req, &ep->queue, queue) {
1064 unsigned host_len, dev_len, len;
1065 int is_short, to_host;
1066 int rescan = 0;
1067
1068 /* 1..N packets of ep->ep.maxpacket each ... the last one
1069 * may be short (including zero length).
1070 *
1071 * writer can send a zlp explicitly (length 0) or implicitly
1072 * (length mod maxpacket zero, and 'zero' flag); they always
1073 * terminate reads.
1074 */
1075 host_len = urb->transfer_buffer_length - urb->actual_length;
1076 dev_len = req->req.length - req->req.actual;
1077 len = min (host_len, dev_len);
1078
1079 /* FIXME update emulated data toggle too */
1080
1081 to_host = usb_pipein (urb->pipe);
1082 if (unlikely (len == 0))
1083 is_short = 1;
1084 else {
1085 char *ubuf, *rbuf;
1086
1087 /* not enough bandwidth left? */
1088 if (limit < ep->ep.maxpacket && limit < len)
1089 break;
1090 len = min (len, (unsigned) limit);
1091 if (len == 0)
1092 break;
1093
1094 /* use an extra pass for the final short packet */
1095 if (len > ep->ep.maxpacket) {
1096 rescan = 1;
1097 len -= (len % ep->ep.maxpacket);
1098 }
1099 is_short = (len % ep->ep.maxpacket) != 0;
1100
1101 /* else transfer packet(s) */
1102 ubuf = urb->transfer_buffer + urb->actual_length;
1103 rbuf = req->req.buf + req->req.actual;
1104 if (to_host)
1105 memcpy (ubuf, rbuf, len);
1106 else
1107 memcpy (rbuf, ubuf, len);
1108 ep->last_io = jiffies;
1109
1110 limit -= len;
1111 urb->actual_length += len;
1112 req->req.actual += len;
1113 }
1114
1115 /* short packets terminate, maybe with overflow/underflow.
1116 * it's only really an error to write too much.
1117 *
1118 * partially filling a buffer optionally blocks queue advances
1119 * (so completion handlers can clean up the queue) but we don't
1120 * need to emulate such data-in-flight. so we only show part
1121 * of the URB_SHORT_NOT_OK effect: completion status.
1122 */
1123 if (is_short) {
1124 if (host_len == dev_len) {
1125 req->req.status = 0;
1126 maybe_set_status (urb, 0);
1127 } else if (to_host) {
1128 req->req.status = 0;
1129 if (dev_len > host_len)
1130 maybe_set_status (urb, -EOVERFLOW);
1131 else
1132 maybe_set_status (urb,
1133 (urb->transfer_flags
1134 & URB_SHORT_NOT_OK)
1135 ? -EREMOTEIO : 0);
1136 } else if (!to_host) {
1137 maybe_set_status (urb, 0);
1138 if (host_len > dev_len)
1139 req->req.status = -EOVERFLOW;
1140 else
1141 req->req.status = 0;
1142 }
1143
1144 /* many requests terminate without a short packet */
1145 } else {
1146 if (req->req.length == req->req.actual
1147 && !req->req.zero)
1148 req->req.status = 0;
1149 if (urb->transfer_buffer_length == urb->actual_length
1150 && !(urb->transfer_flags
1151 & URB_ZERO_PACKET)) {
1152 maybe_set_status (urb, 0);
1153 }
1154 }
1155
1156 /* device side completion --> continuable */
1157 if (req->req.status != -EINPROGRESS) {
1158 list_del_init (&req->queue);
1159
1160 spin_unlock (&dum->lock);
1161 req->req.complete (&ep->ep, &req->req);
1162 spin_lock (&dum->lock);
1163
1164 /* requests might have been unlinked... */
1165 rescan = 1;
1166 }
1167
1168 /* host side completion --> terminate */
1169 if (urb->status != -EINPROGRESS)
1170 break;
1171
1172 /* rescan to continue with any other queued i/o */
1173 if (rescan)
1174 goto top;
1175 }
1176 return limit;
1177 }
1178
1179 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1180 {
1181 int limit = ep->ep.maxpacket;
1182
1183 if (dum->gadget.speed == USB_SPEED_HIGH) {
1184 int tmp;
1185
1186 /* high bandwidth mode */
1187 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1188 tmp = (tmp >> 11) & 0x03;
1189 tmp *= 8 /* applies to entire frame */;
1190 limit += limit * tmp;
1191 }
1192 return limit;
1193 }
1194
1195 #define is_active(dum) ((dum->port_status & \
1196 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1197 USB_PORT_STAT_SUSPEND)) \
1198 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1199
1200 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1201 {
1202 int i;
1203
1204 if (!is_active (dum))
1205 return NULL;
1206 if ((address & ~USB_DIR_IN) == 0)
1207 return &dum->ep [0];
1208 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1209 struct dummy_ep *ep = &dum->ep [i];
1210
1211 if (!ep->desc)
1212 continue;
1213 if (ep->desc->bEndpointAddress == address)
1214 return ep;
1215 }
1216 return NULL;
1217 }
1218
1219 #undef is_active
1220
1221 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1222 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1223 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1224 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1225 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1226 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1227
1228 /* drive both sides of the transfers; looks like irq handlers to
1229 * both drivers except the callbacks aren't in_irq().
1230 */
1231 static void dummy_timer (unsigned long _dum)
1232 {
1233 struct dummy *dum = (struct dummy *) _dum;
1234 struct urbp *urbp, *tmp;
1235 unsigned long flags;
1236 int limit, total;
1237 int i;
1238
1239 /* simplistic model for one frame's bandwidth */
1240 switch (dum->gadget.speed) {
1241 case USB_SPEED_LOW:
1242 total = 8/*bytes*/ * 12/*packets*/;
1243 break;
1244 case USB_SPEED_FULL:
1245 total = 64/*bytes*/ * 19/*packets*/;
1246 break;
1247 case USB_SPEED_HIGH:
1248 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1249 break;
1250 default:
1251 dev_err (dummy_dev(dum), "bogus device speed\n");
1252 return;
1253 }
1254
1255 /* FIXME if HZ != 1000 this will probably misbehave ... */
1256
1257 /* look at each urb queued by the host side driver */
1258 spin_lock_irqsave (&dum->lock, flags);
1259
1260 if (!dum->udev) {
1261 dev_err (dummy_dev(dum),
1262 "timer fired with no URBs pending?\n");
1263 spin_unlock_irqrestore (&dum->lock, flags);
1264 return;
1265 }
1266
1267 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1268 if (!ep_name [i])
1269 break;
1270 dum->ep [i].already_seen = 0;
1271 }
1272
1273 restart:
1274 list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1275 struct urb *urb;
1276 struct dummy_request *req;
1277 u8 address;
1278 struct dummy_ep *ep = NULL;
1279 int type;
1280
1281 urb = urbp->urb;
1282 if (urb->status != -EINPROGRESS) {
1283 /* likely it was just unlinked */
1284 goto return_urb;
1285 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1286 continue;
1287 type = usb_pipetype (urb->pipe);
1288
1289 /* used up this frame's non-periodic bandwidth?
1290 * FIXME there's infinite bandwidth for control and
1291 * periodic transfers ... unrealistic.
1292 */
1293 if (total <= 0 && type == PIPE_BULK)
1294 continue;
1295
1296 /* find the gadget's ep for this request (if configured) */
1297 address = usb_pipeendpoint (urb->pipe);
1298 if (usb_pipein (urb->pipe))
1299 address |= USB_DIR_IN;
1300 ep = find_endpoint(dum, address);
1301 if (!ep) {
1302 /* set_configuration() disagreement */
1303 dev_dbg (dummy_dev(dum),
1304 "no ep configured for urb %p\n",
1305 urb);
1306 maybe_set_status (urb, -EPROTO);
1307 goto return_urb;
1308 }
1309
1310 if (ep->already_seen)
1311 continue;
1312 ep->already_seen = 1;
1313 if (ep == &dum->ep [0] && urb->error_count) {
1314 ep->setup_stage = 1; /* a new urb */
1315 urb->error_count = 0;
1316 }
1317 if (ep->halted && !ep->setup_stage) {
1318 /* NOTE: must not be iso! */
1319 dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1320 ep->ep.name, urb);
1321 maybe_set_status (urb, -EPIPE);
1322 goto return_urb;
1323 }
1324 /* FIXME make sure both ends agree on maxpacket */
1325
1326 /* handle control requests */
1327 if (ep == &dum->ep [0] && ep->setup_stage) {
1328 struct usb_ctrlrequest setup;
1329 int value = 1;
1330 struct dummy_ep *ep2;
1331 unsigned w_index;
1332 unsigned w_value;
1333
1334 setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1335 w_index = le16_to_cpu(setup.wIndex);
1336 w_value = le16_to_cpu(setup.wValue);
1337 if (le16_to_cpu(setup.wLength) !=
1338 urb->transfer_buffer_length) {
1339 maybe_set_status (urb, -EOVERFLOW);
1340 goto return_urb;
1341 }
1342
1343 /* paranoia, in case of stale queued data */
1344 list_for_each_entry (req, &ep->queue, queue) {
1345 list_del_init (&req->queue);
1346 req->req.status = -EOVERFLOW;
1347 dev_dbg (udc_dev(dum), "stale req = %p\n",
1348 req);
1349
1350 spin_unlock (&dum->lock);
1351 req->req.complete (&ep->ep, &req->req);
1352 spin_lock (&dum->lock);
1353 ep->already_seen = 0;
1354 goto restart;
1355 }
1356
1357 /* gadget driver never sees set_address or operations
1358 * on standard feature flags. some hardware doesn't
1359 * even expose them.
1360 */
1361 ep->last_io = jiffies;
1362 ep->setup_stage = 0;
1363 ep->halted = 0;
1364 switch (setup.bRequest) {
1365 case USB_REQ_SET_ADDRESS:
1366 if (setup.bRequestType != Dev_Request)
1367 break;
1368 dum->address = w_value;
1369 maybe_set_status (urb, 0);
1370 dev_dbg (udc_dev(dum), "set_address = %d\n",
1371 w_value);
1372 value = 0;
1373 break;
1374 case USB_REQ_SET_FEATURE:
1375 if (setup.bRequestType == Dev_Request) {
1376 value = 0;
1377 switch (w_value) {
1378 case USB_DEVICE_REMOTE_WAKEUP:
1379 break;
1380 case USB_DEVICE_B_HNP_ENABLE:
1381 dum->gadget.b_hnp_enable = 1;
1382 break;
1383 case USB_DEVICE_A_HNP_SUPPORT:
1384 dum->gadget.a_hnp_support = 1;
1385 break;
1386 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1387 dum->gadget.a_alt_hnp_support
1388 = 1;
1389 break;
1390 default:
1391 value = -EOPNOTSUPP;
1392 }
1393 if (value == 0) {
1394 dum->devstatus |=
1395 (1 << w_value);
1396 maybe_set_status (urb, 0);
1397 }
1398
1399 } else if (setup.bRequestType == Ep_Request) {
1400 // endpoint halt
1401 ep2 = find_endpoint (dum, w_index);
1402 if (!ep2) {
1403 value = -EOPNOTSUPP;
1404 break;
1405 }
1406 ep2->halted = 1;
1407 value = 0;
1408 maybe_set_status (urb, 0);
1409 }
1410 break;
1411 case USB_REQ_CLEAR_FEATURE:
1412 if (setup.bRequestType == Dev_Request) {
1413 switch (w_value) {
1414 case USB_DEVICE_REMOTE_WAKEUP:
1415 dum->devstatus &= ~(1 <<
1416 USB_DEVICE_REMOTE_WAKEUP);
1417 value = 0;
1418 maybe_set_status (urb, 0);
1419 break;
1420 default:
1421 value = -EOPNOTSUPP;
1422 break;
1423 }
1424 } else if (setup.bRequestType == Ep_Request) {
1425 // endpoint halt
1426 ep2 = find_endpoint (dum, w_index);
1427 if (!ep2) {
1428 value = -EOPNOTSUPP;
1429 break;
1430 }
1431 ep2->halted = 0;
1432 value = 0;
1433 maybe_set_status (urb, 0);
1434 }
1435 break;
1436 case USB_REQ_GET_STATUS:
1437 if (setup.bRequestType == Dev_InRequest
1438 || setup.bRequestType
1439 == Intf_InRequest
1440 || setup.bRequestType
1441 == Ep_InRequest
1442 ) {
1443 char *buf;
1444
1445 // device: remote wakeup, selfpowered
1446 // interface: nothing
1447 // endpoint: halt
1448 buf = (char *)urb->transfer_buffer;
1449 if (urb->transfer_buffer_length > 0) {
1450 if (setup.bRequestType ==
1451 Ep_InRequest) {
1452 ep2 = find_endpoint (dum, w_index);
1453 if (!ep2) {
1454 value = -EOPNOTSUPP;
1455 break;
1456 }
1457 buf [0] = ep2->halted;
1458 } else if (setup.bRequestType ==
1459 Dev_InRequest) {
1460 buf [0] = (u8)
1461 dum->devstatus;
1462 } else
1463 buf [0] = 0;
1464 }
1465 if (urb->transfer_buffer_length > 1)
1466 buf [1] = 0;
1467 urb->actual_length = min (2,
1468 urb->transfer_buffer_length);
1469 value = 0;
1470 maybe_set_status (urb, 0);
1471 }
1472 break;
1473 }
1474
1475 /* gadget driver handles all other requests. block
1476 * until setup() returns; no reentrancy issues etc.
1477 */
1478 if (value > 0) {
1479 spin_unlock (&dum->lock);
1480 value = dum->driver->setup (&dum->gadget,
1481 &setup);
1482 spin_lock (&dum->lock);
1483
1484 if (value >= 0) {
1485 /* no delays (max 64KB data stage) */
1486 limit = 64*1024;
1487 goto treat_control_like_bulk;
1488 }
1489 /* error, see below */
1490 }
1491
1492 if (value < 0) {
1493 if (value != -EOPNOTSUPP)
1494 dev_dbg (udc_dev(dum),
1495 "setup --> %d\n",
1496 value);
1497 maybe_set_status (urb, -EPIPE);
1498 urb->actual_length = 0;
1499 }
1500
1501 goto return_urb;
1502 }
1503
1504 /* non-control requests */
1505 limit = total;
1506 switch (usb_pipetype (urb->pipe)) {
1507 case PIPE_ISOCHRONOUS:
1508 /* FIXME is it urb->interval since the last xfer?
1509 * use urb->iso_frame_desc[i].
1510 * complete whether or not ep has requests queued.
1511 * report random errors, to debug drivers.
1512 */
1513 limit = max (limit, periodic_bytes (dum, ep));
1514 maybe_set_status (urb, -ENOSYS);
1515 break;
1516
1517 case PIPE_INTERRUPT:
1518 /* FIXME is it urb->interval since the last xfer?
1519 * this almost certainly polls too fast.
1520 */
1521 limit = max (limit, periodic_bytes (dum, ep));
1522 /* FALLTHROUGH */
1523
1524 // case PIPE_BULK: case PIPE_CONTROL:
1525 default:
1526 treat_control_like_bulk:
1527 ep->last_io = jiffies;
1528 total = transfer (dum, urb, ep, limit);
1529 break;
1530 }
1531
1532 /* incomplete transfer? */
1533 if (urb->status == -EINPROGRESS)
1534 continue;
1535
1536 return_urb:
1537 urb->hcpriv = NULL;
1538 list_del (&urbp->urbp_list);
1539 kfree (urbp);
1540 if (ep)
1541 ep->already_seen = ep->setup_stage = 0;
1542
1543 spin_unlock (&dum->lock);
1544 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1545 spin_lock (&dum->lock);
1546
1547 goto restart;
1548 }
1549
1550 if (list_empty (&dum->urbp_list)) {
1551 usb_put_dev (dum->udev);
1552 dum->udev = NULL;
1553 } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1554 /* want a 1 msec delay here */
1555 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1556 }
1557
1558 spin_unlock_irqrestore (&dum->lock, flags);
1559 }
1560
1561 /*-------------------------------------------------------------------------*/
1562
1563 #define PORT_C_MASK \
1564 ((USB_PORT_STAT_C_CONNECTION \
1565 | USB_PORT_STAT_C_ENABLE \
1566 | USB_PORT_STAT_C_SUSPEND \
1567 | USB_PORT_STAT_C_OVERCURRENT \
1568 | USB_PORT_STAT_C_RESET) << 16)
1569
1570 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1571 {
1572 struct dummy *dum;
1573 unsigned long flags;
1574 int retval = 0;
1575
1576 dum = hcd_to_dummy (hcd);
1577
1578 spin_lock_irqsave (&dum->lock, flags);
1579 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1580 goto done;
1581
1582 if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1583 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1584 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1585 set_link_state (dum);
1586 }
1587
1588 if ((dum->port_status & PORT_C_MASK) != 0) {
1589 *buf = (1 << 1);
1590 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1591 dum->port_status);
1592 retval = 1;
1593 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1594 usb_hcd_resume_root_hub (hcd);
1595 }
1596 done:
1597 spin_unlock_irqrestore (&dum->lock, flags);
1598 return retval;
1599 }
1600
1601 static inline void
1602 hub_descriptor (struct usb_hub_descriptor *desc)
1603 {
1604 memset (desc, 0, sizeof *desc);
1605 desc->bDescriptorType = 0x29;
1606 desc->bDescLength = 9;
1607 desc->wHubCharacteristics = (__force __u16)
1608 (__constant_cpu_to_le16 (0x0001));
1609 desc->bNbrPorts = 1;
1610 desc->bitmap [0] = 0xff;
1611 desc->bitmap [1] = 0xff;
1612 }
1613
1614 static int dummy_hub_control (
1615 struct usb_hcd *hcd,
1616 u16 typeReq,
1617 u16 wValue,
1618 u16 wIndex,
1619 char *buf,
1620 u16 wLength
1621 ) {
1622 struct dummy *dum;
1623 int retval = 0;
1624 unsigned long flags;
1625
1626 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1627 return -ETIMEDOUT;
1628
1629 dum = hcd_to_dummy (hcd);
1630 spin_lock_irqsave (&dum->lock, flags);
1631 switch (typeReq) {
1632 case ClearHubFeature:
1633 break;
1634 case ClearPortFeature:
1635 switch (wValue) {
1636 case USB_PORT_FEAT_SUSPEND:
1637 if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1638 /* 20msec resume signaling */
1639 dum->resuming = 1;
1640 dum->re_timeout = jiffies +
1641 msecs_to_jiffies(20);
1642 }
1643 break;
1644 case USB_PORT_FEAT_POWER:
1645 if (dum->port_status & USB_PORT_STAT_POWER)
1646 dev_dbg (dummy_dev(dum), "power-off\n");
1647 /* FALLS THROUGH */
1648 default:
1649 dum->port_status &= ~(1 << wValue);
1650 set_link_state (dum);
1651 }
1652 break;
1653 case GetHubDescriptor:
1654 hub_descriptor ((struct usb_hub_descriptor *) buf);
1655 break;
1656 case GetHubStatus:
1657 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1658 break;
1659 case GetPortStatus:
1660 if (wIndex != 1)
1661 retval = -EPIPE;
1662
1663 /* whoever resets or resumes must GetPortStatus to
1664 * complete it!!
1665 */
1666 if (dum->resuming &&
1667 time_after_eq (jiffies, dum->re_timeout)) {
1668 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1669 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1670 }
1671 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1672 time_after_eq (jiffies, dum->re_timeout)) {
1673 dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1674 dum->port_status &= ~USB_PORT_STAT_RESET;
1675 if (dum->pullup) {
1676 dum->port_status |= USB_PORT_STAT_ENABLE;
1677 /* give it the best speed we agree on */
1678 dum->gadget.speed = dum->driver->speed;
1679 dum->gadget.ep0->maxpacket = 64;
1680 switch (dum->gadget.speed) {
1681 case USB_SPEED_HIGH:
1682 dum->port_status |=
1683 USB_PORT_STAT_HIGH_SPEED;
1684 break;
1685 case USB_SPEED_LOW:
1686 dum->gadget.ep0->maxpacket = 8;
1687 dum->port_status |=
1688 USB_PORT_STAT_LOW_SPEED;
1689 break;
1690 default:
1691 dum->gadget.speed = USB_SPEED_FULL;
1692 break;
1693 }
1694 }
1695 }
1696 set_link_state (dum);
1697 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1698 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1699 break;
1700 case SetHubFeature:
1701 retval = -EPIPE;
1702 break;
1703 case SetPortFeature:
1704 switch (wValue) {
1705 case USB_PORT_FEAT_SUSPEND:
1706 if (dum->active) {
1707 dum->port_status |= USB_PORT_STAT_SUSPEND;
1708
1709 /* HNP would happen here; for now we
1710 * assume b_bus_req is always true.
1711 */
1712 set_link_state (dum);
1713 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1714 & dum->devstatus) != 0)
1715 dev_dbg (dummy_dev(dum),
1716 "no HNP yet!\n");
1717 }
1718 break;
1719 case USB_PORT_FEAT_POWER:
1720 dum->port_status |= USB_PORT_STAT_POWER;
1721 set_link_state (dum);
1722 break;
1723 case USB_PORT_FEAT_RESET:
1724 /* if it's already enabled, disable */
1725 dum->port_status &= ~(USB_PORT_STAT_ENABLE
1726 | USB_PORT_STAT_LOW_SPEED
1727 | USB_PORT_STAT_HIGH_SPEED);
1728 dum->devstatus = 0;
1729 /* 50msec reset signaling */
1730 dum->re_timeout = jiffies + msecs_to_jiffies(50);
1731 /* FALLS THROUGH */
1732 default:
1733 if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1734 dum->port_status |= (1 << wValue);
1735 set_link_state (dum);
1736 }
1737 }
1738 break;
1739
1740 default:
1741 dev_dbg (dummy_dev(dum),
1742 "hub control req%04x v%04x i%04x l%d\n",
1743 typeReq, wValue, wIndex, wLength);
1744
1745 /* "protocol stall" on error */
1746 retval = -EPIPE;
1747 }
1748 spin_unlock_irqrestore (&dum->lock, flags);
1749
1750 if ((dum->port_status & PORT_C_MASK) != 0)
1751 usb_hcd_poll_rh_status (hcd);
1752 return retval;
1753 }
1754
1755 static int dummy_bus_suspend (struct usb_hcd *hcd)
1756 {
1757 struct dummy *dum = hcd_to_dummy (hcd);
1758
1759 dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1760
1761 spin_lock_irq (&dum->lock);
1762 dum->rh_state = DUMMY_RH_SUSPENDED;
1763 set_link_state (dum);
1764 hcd->state = HC_STATE_SUSPENDED;
1765 spin_unlock_irq (&dum->lock);
1766 return 0;
1767 }
1768
1769 static int dummy_bus_resume (struct usb_hcd *hcd)
1770 {
1771 struct dummy *dum = hcd_to_dummy (hcd);
1772 int rc = 0;
1773
1774 dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1775
1776 spin_lock_irq (&dum->lock);
1777 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1778 dev_warn (&hcd->self.root_hub->dev, "HC isn't running!\n");
1779 rc = -ENODEV;
1780 } else {
1781 dum->rh_state = DUMMY_RH_RUNNING;
1782 set_link_state (dum);
1783 if (!list_empty(&dum->urbp_list))
1784 mod_timer (&dum->timer, jiffies);
1785 hcd->state = HC_STATE_RUNNING;
1786 }
1787 spin_unlock_irq (&dum->lock);
1788 return rc;
1789 }
1790
1791 /*-------------------------------------------------------------------------*/
1792
1793 static inline ssize_t
1794 show_urb (char *buf, size_t size, struct urb *urb)
1795 {
1796 int ep = usb_pipeendpoint (urb->pipe);
1797
1798 return snprintf (buf, size,
1799 "urb/%p %s ep%d%s%s len %d/%d\n",
1800 urb,
1801 ({ char *s;
1802 switch (urb->dev->speed) {
1803 case USB_SPEED_LOW: s = "ls"; break;
1804 case USB_SPEED_FULL: s = "fs"; break;
1805 case USB_SPEED_HIGH: s = "hs"; break;
1806 default: s = "?"; break;
1807 }; s; }),
1808 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1809 ({ char *s; \
1810 switch (usb_pipetype (urb->pipe)) { \
1811 case PIPE_CONTROL: s = ""; break; \
1812 case PIPE_BULK: s = "-bulk"; break; \
1813 case PIPE_INTERRUPT: s = "-int"; break; \
1814 default: s = "-iso"; break; \
1815 }; s;}),
1816 urb->actual_length, urb->transfer_buffer_length);
1817 }
1818
1819 static ssize_t
1820 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1821 {
1822 struct usb_hcd *hcd = dev_get_drvdata (dev);
1823 struct dummy *dum = hcd_to_dummy (hcd);
1824 struct urbp *urbp;
1825 size_t size = 0;
1826 unsigned long flags;
1827
1828 spin_lock_irqsave (&dum->lock, flags);
1829 list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1830 size_t temp;
1831
1832 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1833 buf += temp;
1834 size += temp;
1835 }
1836 spin_unlock_irqrestore (&dum->lock, flags);
1837
1838 return size;
1839 }
1840 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1841
1842 static int dummy_start (struct usb_hcd *hcd)
1843 {
1844 struct dummy *dum;
1845
1846 dum = hcd_to_dummy (hcd);
1847
1848 /*
1849 * MASTER side init ... we emulate a root hub that'll only ever
1850 * talk to one device (the slave side). Also appears in sysfs,
1851 * just like more familiar pci-based HCDs.
1852 */
1853 spin_lock_init (&dum->lock);
1854 init_timer (&dum->timer);
1855 dum->timer.function = dummy_timer;
1856 dum->timer.data = (unsigned long) dum;
1857 dum->rh_state = DUMMY_RH_RUNNING;
1858
1859 INIT_LIST_HEAD (&dum->urbp_list);
1860
1861 /* only show a low-power port: just 8mA */
1862 hcd->power_budget = 8;
1863 hcd->state = HC_STATE_RUNNING;
1864 hcd->uses_new_polling = 1;
1865
1866 #ifdef CONFIG_USB_OTG
1867 hcd->self.otg_port = 1;
1868 #endif
1869
1870 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1871 device_create_file (dummy_dev(dum), &dev_attr_urbs);
1872 return 0;
1873 }
1874
1875 static void dummy_stop (struct usb_hcd *hcd)
1876 {
1877 struct dummy *dum;
1878
1879 dum = hcd_to_dummy (hcd);
1880
1881 device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1882 usb_gadget_unregister_driver (dum->driver);
1883 dev_info (dummy_dev(dum), "stopped\n");
1884 }
1885
1886 /*-------------------------------------------------------------------------*/
1887
1888 static int dummy_h_get_frame (struct usb_hcd *hcd)
1889 {
1890 return dummy_g_get_frame (NULL);
1891 }
1892
1893 static const struct hc_driver dummy_hcd = {
1894 .description = (char *) driver_name,
1895 .product_desc = "Dummy host controller",
1896 .hcd_priv_size = sizeof(struct dummy),
1897
1898 .flags = HCD_USB2,
1899
1900 .start = dummy_start,
1901 .stop = dummy_stop,
1902
1903 .urb_enqueue = dummy_urb_enqueue,
1904 .urb_dequeue = dummy_urb_dequeue,
1905
1906 .get_frame_number = dummy_h_get_frame,
1907
1908 .hub_status_data = dummy_hub_status,
1909 .hub_control = dummy_hub_control,
1910 .bus_suspend = dummy_bus_suspend,
1911 .bus_resume = dummy_bus_resume,
1912 };
1913
1914 static int dummy_hcd_probe(struct platform_device *pdev)
1915 {
1916 struct usb_hcd *hcd;
1917 int retval;
1918
1919 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1920
1921 hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id);
1922 if (!hcd)
1923 return -ENOMEM;
1924 the_controller = hcd_to_dummy (hcd);
1925
1926 retval = usb_add_hcd(hcd, 0, 0);
1927 if (retval != 0) {
1928 usb_put_hcd (hcd);
1929 the_controller = NULL;
1930 }
1931 return retval;
1932 }
1933
1934 static int dummy_hcd_remove (struct platform_device *pdev)
1935 {
1936 struct usb_hcd *hcd;
1937
1938 hcd = platform_get_drvdata (pdev);
1939 usb_remove_hcd (hcd);
1940 usb_put_hcd (hcd);
1941 the_controller = NULL;
1942 return 0;
1943 }
1944
1945 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1946 {
1947 struct usb_hcd *hcd;
1948 struct dummy *dum;
1949 int rc = 0;
1950
1951 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1952
1953 hcd = platform_get_drvdata (pdev);
1954 dum = hcd_to_dummy (hcd);
1955 if (dum->rh_state == DUMMY_RH_RUNNING) {
1956 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1957 rc = -EBUSY;
1958 } else
1959 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1960 return rc;
1961 }
1962
1963 static int dummy_hcd_resume (struct platform_device *pdev)
1964 {
1965 struct usb_hcd *hcd;
1966
1967 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1968
1969 hcd = platform_get_drvdata (pdev);
1970 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1971 usb_hcd_poll_rh_status (hcd);
1972 return 0;
1973 }
1974
1975 static struct platform_driver dummy_hcd_driver = {
1976 .probe = dummy_hcd_probe,
1977 .remove = dummy_hcd_remove,
1978 .suspend = dummy_hcd_suspend,
1979 .resume = dummy_hcd_resume,
1980 .driver = {
1981 .name = (char *) driver_name,
1982 .owner = THIS_MODULE,
1983 },
1984 };
1985
1986 /*-------------------------------------------------------------------------*/
1987
1988 /* These don't need to do anything because the pdev structures are
1989 * statically allocated. */
1990 static void
1991 dummy_udc_release (struct device *dev) {}
1992
1993 static void
1994 dummy_hcd_release (struct device *dev) {}
1995
1996 static struct platform_device the_udc_pdev = {
1997 .name = (char *) gadget_name,
1998 .id = -1,
1999 .dev = {
2000 .release = dummy_udc_release,
2001 },
2002 };
2003
2004 static struct platform_device the_hcd_pdev = {
2005 .name = (char *) driver_name,
2006 .id = -1,
2007 .dev = {
2008 .release = dummy_hcd_release,
2009 },
2010 };
2011
2012 static int __init init (void)
2013 {
2014 int retval;
2015
2016 if (usb_disabled ())
2017 return -ENODEV;
2018
2019 retval = platform_driver_register (&dummy_hcd_driver);
2020 if (retval < 0)
2021 return retval;
2022
2023 retval = platform_driver_register (&dummy_udc_driver);
2024 if (retval < 0)
2025 goto err_register_udc_driver;
2026
2027 retval = platform_device_register (&the_hcd_pdev);
2028 if (retval < 0)
2029 goto err_register_hcd;
2030
2031 retval = platform_device_register (&the_udc_pdev);
2032 if (retval < 0)
2033 goto err_register_udc;
2034 return retval;
2035
2036 err_register_udc:
2037 platform_device_unregister (&the_hcd_pdev);
2038 err_register_hcd:
2039 platform_driver_unregister (&dummy_udc_driver);
2040 err_register_udc_driver:
2041 platform_driver_unregister (&dummy_hcd_driver);
2042 return retval;
2043 }
2044 module_init (init);
2045
2046 static void __exit cleanup (void)
2047 {
2048 platform_device_unregister (&the_udc_pdev);
2049 platform_device_unregister (&the_hcd_pdev);
2050 platform_driver_unregister (&dummy_udc_driver);
2051 platform_driver_unregister (&dummy_hcd_driver);
2052 }
2053 module_exit (cleanup);
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