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Merge branch 'timer/cleanup' into late/mvebu2
[deliverable/linux.git] / drivers / usb / gadget / dummy_hcd.c
1 /*
2 * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
3 *
4 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
5 *
6 * Copyright (C) 2003 David Brownell
7 * Copyright (C) 2003-2005 Alan Stern
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15
16 /*
17 * This exposes a device side "USB gadget" API, driven by requests to a
18 * Linux-USB host controller driver. USB traffic is simulated; there's
19 * no need for USB hardware. Use this with two other drivers:
20 *
21 * - Gadget driver, responding to requests (slave);
22 * - Host-side device driver, as already familiar in Linux.
23 *
24 * Having this all in one kernel can help some stages of development,
25 * bypassing some hardware (and driver) issues. UML could help too.
26 */
27
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/timer.h>
36 #include <linux/list.h>
37 #include <linux/interrupt.h>
38 #include <linux/platform_device.h>
39 #include <linux/usb.h>
40 #include <linux/usb/gadget.h>
41 #include <linux/usb/hcd.h>
42 #include <linux/scatterlist.h>
43
44 #include <asm/byteorder.h>
45 #include <linux/io.h>
46 #include <asm/irq.h>
47 #include <asm/unaligned.h>
48
49 #define DRIVER_DESC "USB Host+Gadget Emulator"
50 #define DRIVER_VERSION "02 May 2005"
51
52 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
53
54 static const char driver_name[] = "dummy_hcd";
55 static const char driver_desc[] = "USB Host+Gadget Emulator";
56
57 static const char gadget_name[] = "dummy_udc";
58
59 MODULE_DESCRIPTION(DRIVER_DESC);
60 MODULE_AUTHOR("David Brownell");
61 MODULE_LICENSE("GPL");
62
63 struct dummy_hcd_module_parameters {
64 bool is_super_speed;
65 bool is_high_speed;
66 unsigned int num;
67 };
68
69 static struct dummy_hcd_module_parameters mod_data = {
70 .is_super_speed = false,
71 .is_high_speed = true,
72 .num = 1,
73 };
74 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
75 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
76 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
77 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
78 module_param_named(num, mod_data.num, uint, S_IRUGO);
79 MODULE_PARM_DESC(num, "number of emulated controllers");
80 /*-------------------------------------------------------------------------*/
81
82 /* gadget side driver data structres */
83 struct dummy_ep {
84 struct list_head queue;
85 unsigned long last_io; /* jiffies timestamp */
86 struct usb_gadget *gadget;
87 const struct usb_endpoint_descriptor *desc;
88 struct usb_ep ep;
89 unsigned halted:1;
90 unsigned wedged:1;
91 unsigned already_seen:1;
92 unsigned setup_stage:1;
93 unsigned stream_en:1;
94 };
95
96 struct dummy_request {
97 struct list_head queue; /* ep's requests */
98 struct usb_request req;
99 };
100
101 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
102 {
103 return container_of(_ep, struct dummy_ep, ep);
104 }
105
106 static inline struct dummy_request *usb_request_to_dummy_request
107 (struct usb_request *_req)
108 {
109 return container_of(_req, struct dummy_request, req);
110 }
111
112 /*-------------------------------------------------------------------------*/
113
114 /*
115 * Every device has ep0 for control requests, plus up to 30 more endpoints,
116 * in one of two types:
117 *
118 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
119 * number can be changed. Names like "ep-a" are used for this type.
120 *
121 * - Fixed Function: in other cases. some characteristics may be mutable;
122 * that'd be hardware-specific. Names like "ep12out-bulk" are used.
123 *
124 * Gadget drivers are responsible for not setting up conflicting endpoint
125 * configurations, illegal or unsupported packet lengths, and so on.
126 */
127
128 static const char ep0name[] = "ep0";
129
130 static const char *const ep_name[] = {
131 ep0name, /* everyone has ep0 */
132
133 /* act like a pxa250: fifteen fixed function endpoints */
134 "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
135 "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
136 "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
137 "ep15in-int",
138
139 /* or like sa1100: two fixed function endpoints */
140 "ep1out-bulk", "ep2in-bulk",
141
142 /* and now some generic EPs so we have enough in multi config */
143 "ep3out", "ep4in", "ep5out", "ep6out", "ep7in", "ep8out", "ep9in",
144 "ep10out", "ep11out", "ep12in", "ep13out", "ep14in", "ep15out",
145 };
146 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
147
148 /*-------------------------------------------------------------------------*/
149
150 #define FIFO_SIZE 64
151
152 struct urbp {
153 struct urb *urb;
154 struct list_head urbp_list;
155 struct sg_mapping_iter miter;
156 u32 miter_started;
157 };
158
159
160 enum dummy_rh_state {
161 DUMMY_RH_RESET,
162 DUMMY_RH_SUSPENDED,
163 DUMMY_RH_RUNNING
164 };
165
166 struct dummy_hcd {
167 struct dummy *dum;
168 enum dummy_rh_state rh_state;
169 struct timer_list timer;
170 u32 port_status;
171 u32 old_status;
172 unsigned long re_timeout;
173
174 struct usb_device *udev;
175 struct list_head urbp_list;
176 u32 stream_en_ep;
177 u8 num_stream[30 / 2];
178
179 unsigned active:1;
180 unsigned old_active:1;
181 unsigned resuming:1;
182 };
183
184 struct dummy {
185 spinlock_t lock;
186
187 /*
188 * SLAVE/GADGET side support
189 */
190 struct dummy_ep ep[DUMMY_ENDPOINTS];
191 int address;
192 struct usb_gadget gadget;
193 struct usb_gadget_driver *driver;
194 struct dummy_request fifo_req;
195 u8 fifo_buf[FIFO_SIZE];
196 u16 devstatus;
197 unsigned udc_suspended:1;
198 unsigned pullup:1;
199
200 /*
201 * MASTER/HOST side support
202 */
203 struct dummy_hcd *hs_hcd;
204 struct dummy_hcd *ss_hcd;
205 };
206
207 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
208 {
209 return (struct dummy_hcd *) (hcd->hcd_priv);
210 }
211
212 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
213 {
214 return container_of((void *) dum, struct usb_hcd, hcd_priv);
215 }
216
217 static inline struct device *dummy_dev(struct dummy_hcd *dum)
218 {
219 return dummy_hcd_to_hcd(dum)->self.controller;
220 }
221
222 static inline struct device *udc_dev(struct dummy *dum)
223 {
224 return dum->gadget.dev.parent;
225 }
226
227 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
228 {
229 return container_of(ep->gadget, struct dummy, gadget);
230 }
231
232 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
233 {
234 struct dummy *dum = container_of(gadget, struct dummy, gadget);
235 if (dum->gadget.speed == USB_SPEED_SUPER)
236 return dum->ss_hcd;
237 else
238 return dum->hs_hcd;
239 }
240
241 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
242 {
243 return container_of(dev, struct dummy, gadget.dev);
244 }
245
246 /*-------------------------------------------------------------------------*/
247
248 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
249
250 /* called with spinlock held */
251 static void nuke(struct dummy *dum, struct dummy_ep *ep)
252 {
253 while (!list_empty(&ep->queue)) {
254 struct dummy_request *req;
255
256 req = list_entry(ep->queue.next, struct dummy_request, queue);
257 list_del_init(&req->queue);
258 req->req.status = -ESHUTDOWN;
259
260 spin_unlock(&dum->lock);
261 req->req.complete(&ep->ep, &req->req);
262 spin_lock(&dum->lock);
263 }
264 }
265
266 /* caller must hold lock */
267 static void stop_activity(struct dummy *dum)
268 {
269 struct dummy_ep *ep;
270
271 /* prevent any more requests */
272 dum->address = 0;
273
274 /* The timer is left running so that outstanding URBs can fail */
275
276 /* nuke any pending requests first, so driver i/o is quiesced */
277 list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list)
278 nuke(dum, ep);
279
280 /* driver now does any non-usb quiescing necessary */
281 }
282
283 /**
284 * set_link_state_by_speed() - Sets the current state of the link according to
285 * the hcd speed
286 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
287 *
288 * This function updates the port_status according to the link state and the
289 * speed of the hcd.
290 */
291 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
292 {
293 struct dummy *dum = dum_hcd->dum;
294
295 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
296 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
297 dum_hcd->port_status = 0;
298 } else if (!dum->pullup || dum->udc_suspended) {
299 /* UDC suspend must cause a disconnect */
300 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
301 USB_PORT_STAT_ENABLE);
302 if ((dum_hcd->old_status &
303 USB_PORT_STAT_CONNECTION) != 0)
304 dum_hcd->port_status |=
305 (USB_PORT_STAT_C_CONNECTION << 16);
306 } else {
307 /* device is connected and not suspended */
308 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
309 USB_PORT_STAT_SPEED_5GBPS) ;
310 if ((dum_hcd->old_status &
311 USB_PORT_STAT_CONNECTION) == 0)
312 dum_hcd->port_status |=
313 (USB_PORT_STAT_C_CONNECTION << 16);
314 if ((dum_hcd->port_status &
315 USB_PORT_STAT_ENABLE) == 1 &&
316 (dum_hcd->port_status &
317 USB_SS_PORT_LS_U0) == 1 &&
318 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
319 dum_hcd->active = 1;
320 }
321 } else {
322 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
323 dum_hcd->port_status = 0;
324 } else if (!dum->pullup || dum->udc_suspended) {
325 /* UDC suspend must cause a disconnect */
326 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
327 USB_PORT_STAT_ENABLE |
328 USB_PORT_STAT_LOW_SPEED |
329 USB_PORT_STAT_HIGH_SPEED |
330 USB_PORT_STAT_SUSPEND);
331 if ((dum_hcd->old_status &
332 USB_PORT_STAT_CONNECTION) != 0)
333 dum_hcd->port_status |=
334 (USB_PORT_STAT_C_CONNECTION << 16);
335 } else {
336 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
337 if ((dum_hcd->old_status &
338 USB_PORT_STAT_CONNECTION) == 0)
339 dum_hcd->port_status |=
340 (USB_PORT_STAT_C_CONNECTION << 16);
341 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
342 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
343 else if ((dum_hcd->port_status &
344 USB_PORT_STAT_SUSPEND) == 0 &&
345 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
346 dum_hcd->active = 1;
347 }
348 }
349 }
350
351 /* caller must hold lock */
352 static void set_link_state(struct dummy_hcd *dum_hcd)
353 {
354 struct dummy *dum = dum_hcd->dum;
355
356 dum_hcd->active = 0;
357 if (dum->pullup)
358 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
359 dum->gadget.speed != USB_SPEED_SUPER) ||
360 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
361 dum->gadget.speed == USB_SPEED_SUPER))
362 return;
363
364 set_link_state_by_speed(dum_hcd);
365
366 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
367 dum_hcd->active)
368 dum_hcd->resuming = 0;
369
370 /* if !connected or reset */
371 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
372 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
373 /*
374 * We're connected and not reset (reset occurred now),
375 * and driver attached - disconnect!
376 */
377 if ((dum_hcd->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
378 (dum_hcd->old_status & USB_PORT_STAT_RESET) == 0 &&
379 dum->driver) {
380 stop_activity(dum);
381 spin_unlock(&dum->lock);
382 dum->driver->disconnect(&dum->gadget);
383 spin_lock(&dum->lock);
384 }
385 } else if (dum_hcd->active != dum_hcd->old_active) {
386 if (dum_hcd->old_active && dum->driver->suspend) {
387 spin_unlock(&dum->lock);
388 dum->driver->suspend(&dum->gadget);
389 spin_lock(&dum->lock);
390 } else if (!dum_hcd->old_active && dum->driver->resume) {
391 spin_unlock(&dum->lock);
392 dum->driver->resume(&dum->gadget);
393 spin_lock(&dum->lock);
394 }
395 }
396
397 dum_hcd->old_status = dum_hcd->port_status;
398 dum_hcd->old_active = dum_hcd->active;
399 }
400
401 /*-------------------------------------------------------------------------*/
402
403 /* SLAVE/GADGET SIDE DRIVER
404 *
405 * This only tracks gadget state. All the work is done when the host
406 * side tries some (emulated) i/o operation. Real device controller
407 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
408 */
409
410 #define is_enabled(dum) \
411 (dum->port_status & USB_PORT_STAT_ENABLE)
412
413 static int dummy_enable(struct usb_ep *_ep,
414 const struct usb_endpoint_descriptor *desc)
415 {
416 struct dummy *dum;
417 struct dummy_hcd *dum_hcd;
418 struct dummy_ep *ep;
419 unsigned max;
420 int retval;
421
422 ep = usb_ep_to_dummy_ep(_ep);
423 if (!_ep || !desc || ep->desc || _ep->name == ep0name
424 || desc->bDescriptorType != USB_DT_ENDPOINT)
425 return -EINVAL;
426 dum = ep_to_dummy(ep);
427 if (!dum->driver)
428 return -ESHUTDOWN;
429
430 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
431 if (!is_enabled(dum_hcd))
432 return -ESHUTDOWN;
433
434 /*
435 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
436 * maximum packet size.
437 * For SS devices the wMaxPacketSize is limited by 1024.
438 */
439 max = usb_endpoint_maxp(desc) & 0x7ff;
440
441 /* drivers must not request bad settings, since lower levels
442 * (hardware or its drivers) may not check. some endpoints
443 * can't do iso, many have maxpacket limitations, etc.
444 *
445 * since this "hardware" driver is here to help debugging, we
446 * have some extra sanity checks. (there could be more though,
447 * especially for "ep9out" style fixed function ones.)
448 */
449 retval = -EINVAL;
450 switch (usb_endpoint_type(desc)) {
451 case USB_ENDPOINT_XFER_BULK:
452 if (strstr(ep->ep.name, "-iso")
453 || strstr(ep->ep.name, "-int")) {
454 goto done;
455 }
456 switch (dum->gadget.speed) {
457 case USB_SPEED_SUPER:
458 if (max == 1024)
459 break;
460 goto done;
461 case USB_SPEED_HIGH:
462 if (max == 512)
463 break;
464 goto done;
465 case USB_SPEED_FULL:
466 if (max == 8 || max == 16 || max == 32 || max == 64)
467 /* we'll fake any legal size */
468 break;
469 /* save a return statement */
470 default:
471 goto done;
472 }
473 break;
474 case USB_ENDPOINT_XFER_INT:
475 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
476 goto done;
477 /* real hardware might not handle all packet sizes */
478 switch (dum->gadget.speed) {
479 case USB_SPEED_SUPER:
480 case USB_SPEED_HIGH:
481 if (max <= 1024)
482 break;
483 /* save a return statement */
484 case USB_SPEED_FULL:
485 if (max <= 64)
486 break;
487 /* save a return statement */
488 default:
489 if (max <= 8)
490 break;
491 goto done;
492 }
493 break;
494 case USB_ENDPOINT_XFER_ISOC:
495 if (strstr(ep->ep.name, "-bulk")
496 || strstr(ep->ep.name, "-int"))
497 goto done;
498 /* real hardware might not handle all packet sizes */
499 switch (dum->gadget.speed) {
500 case USB_SPEED_SUPER:
501 case USB_SPEED_HIGH:
502 if (max <= 1024)
503 break;
504 /* save a return statement */
505 case USB_SPEED_FULL:
506 if (max <= 1023)
507 break;
508 /* save a return statement */
509 default:
510 goto done;
511 }
512 break;
513 default:
514 /* few chips support control except on ep0 */
515 goto done;
516 }
517
518 _ep->maxpacket = max;
519 if (usb_ss_max_streams(_ep->comp_desc)) {
520 if (!usb_endpoint_xfer_bulk(desc)) {
521 dev_err(udc_dev(dum), "Can't enable stream support on "
522 "non-bulk ep %s\n", _ep->name);
523 return -EINVAL;
524 }
525 ep->stream_en = 1;
526 }
527 ep->desc = desc;
528
529 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
530 _ep->name,
531 desc->bEndpointAddress & 0x0f,
532 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
533 ({ char *val;
534 switch (usb_endpoint_type(desc)) {
535 case USB_ENDPOINT_XFER_BULK:
536 val = "bulk";
537 break;
538 case USB_ENDPOINT_XFER_ISOC:
539 val = "iso";
540 break;
541 case USB_ENDPOINT_XFER_INT:
542 val = "intr";
543 break;
544 default:
545 val = "ctrl";
546 break;
547 }; val; }),
548 max, ep->stream_en ? "enabled" : "disabled");
549
550 /* at this point real hardware should be NAKing transfers
551 * to that endpoint, until a buffer is queued to it.
552 */
553 ep->halted = ep->wedged = 0;
554 retval = 0;
555 done:
556 return retval;
557 }
558
559 static int dummy_disable(struct usb_ep *_ep)
560 {
561 struct dummy_ep *ep;
562 struct dummy *dum;
563 unsigned long flags;
564 int retval;
565
566 ep = usb_ep_to_dummy_ep(_ep);
567 if (!_ep || !ep->desc || _ep->name == ep0name)
568 return -EINVAL;
569 dum = ep_to_dummy(ep);
570
571 spin_lock_irqsave(&dum->lock, flags);
572 ep->desc = NULL;
573 ep->stream_en = 0;
574 retval = 0;
575 nuke(dum, ep);
576 spin_unlock_irqrestore(&dum->lock, flags);
577
578 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
579 return retval;
580 }
581
582 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
583 gfp_t mem_flags)
584 {
585 struct dummy_ep *ep;
586 struct dummy_request *req;
587
588 if (!_ep)
589 return NULL;
590 ep = usb_ep_to_dummy_ep(_ep);
591
592 req = kzalloc(sizeof(*req), mem_flags);
593 if (!req)
594 return NULL;
595 INIT_LIST_HEAD(&req->queue);
596 return &req->req;
597 }
598
599 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
600 {
601 struct dummy_request *req;
602
603 if (!_ep || !_req) {
604 WARN_ON(1);
605 return;
606 }
607
608 req = usb_request_to_dummy_request(_req);
609 WARN_ON(!list_empty(&req->queue));
610 kfree(req);
611 }
612
613 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
614 {
615 }
616
617 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
618 gfp_t mem_flags)
619 {
620 struct dummy_ep *ep;
621 struct dummy_request *req;
622 struct dummy *dum;
623 struct dummy_hcd *dum_hcd;
624 unsigned long flags;
625
626 req = usb_request_to_dummy_request(_req);
627 if (!_req || !list_empty(&req->queue) || !_req->complete)
628 return -EINVAL;
629
630 ep = usb_ep_to_dummy_ep(_ep);
631 if (!_ep || (!ep->desc && _ep->name != ep0name))
632 return -EINVAL;
633
634 dum = ep_to_dummy(ep);
635 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
636 if (!dum->driver || !is_enabled(dum_hcd))
637 return -ESHUTDOWN;
638
639 #if 0
640 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
641 ep, _req, _ep->name, _req->length, _req->buf);
642 #endif
643 _req->status = -EINPROGRESS;
644 _req->actual = 0;
645 spin_lock_irqsave(&dum->lock, flags);
646
647 /* implement an emulated single-request FIFO */
648 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
649 list_empty(&dum->fifo_req.queue) &&
650 list_empty(&ep->queue) &&
651 _req->length <= FIFO_SIZE) {
652 req = &dum->fifo_req;
653 req->req = *_req;
654 req->req.buf = dum->fifo_buf;
655 memcpy(dum->fifo_buf, _req->buf, _req->length);
656 req->req.context = dum;
657 req->req.complete = fifo_complete;
658
659 list_add_tail(&req->queue, &ep->queue);
660 spin_unlock(&dum->lock);
661 _req->actual = _req->length;
662 _req->status = 0;
663 _req->complete(_ep, _req);
664 spin_lock(&dum->lock);
665 } else
666 list_add_tail(&req->queue, &ep->queue);
667 spin_unlock_irqrestore(&dum->lock, flags);
668
669 /* real hardware would likely enable transfers here, in case
670 * it'd been left NAKing.
671 */
672 return 0;
673 }
674
675 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
676 {
677 struct dummy_ep *ep;
678 struct dummy *dum;
679 int retval = -EINVAL;
680 unsigned long flags;
681 struct dummy_request *req = NULL;
682
683 if (!_ep || !_req)
684 return retval;
685 ep = usb_ep_to_dummy_ep(_ep);
686 dum = ep_to_dummy(ep);
687
688 if (!dum->driver)
689 return -ESHUTDOWN;
690
691 local_irq_save(flags);
692 spin_lock(&dum->lock);
693 list_for_each_entry(req, &ep->queue, queue) {
694 if (&req->req == _req) {
695 list_del_init(&req->queue);
696 _req->status = -ECONNRESET;
697 retval = 0;
698 break;
699 }
700 }
701 spin_unlock(&dum->lock);
702
703 if (retval == 0) {
704 dev_dbg(udc_dev(dum),
705 "dequeued req %p from %s, len %d buf %p\n",
706 req, _ep->name, _req->length, _req->buf);
707 _req->complete(_ep, _req);
708 }
709 local_irq_restore(flags);
710 return retval;
711 }
712
713 static int
714 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
715 {
716 struct dummy_ep *ep;
717 struct dummy *dum;
718
719 if (!_ep)
720 return -EINVAL;
721 ep = usb_ep_to_dummy_ep(_ep);
722 dum = ep_to_dummy(ep);
723 if (!dum->driver)
724 return -ESHUTDOWN;
725 if (!value)
726 ep->halted = ep->wedged = 0;
727 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
728 !list_empty(&ep->queue))
729 return -EAGAIN;
730 else {
731 ep->halted = 1;
732 if (wedged)
733 ep->wedged = 1;
734 }
735 /* FIXME clear emulated data toggle too */
736 return 0;
737 }
738
739 static int
740 dummy_set_halt(struct usb_ep *_ep, int value)
741 {
742 return dummy_set_halt_and_wedge(_ep, value, 0);
743 }
744
745 static int dummy_set_wedge(struct usb_ep *_ep)
746 {
747 if (!_ep || _ep->name == ep0name)
748 return -EINVAL;
749 return dummy_set_halt_and_wedge(_ep, 1, 1);
750 }
751
752 static const struct usb_ep_ops dummy_ep_ops = {
753 .enable = dummy_enable,
754 .disable = dummy_disable,
755
756 .alloc_request = dummy_alloc_request,
757 .free_request = dummy_free_request,
758
759 .queue = dummy_queue,
760 .dequeue = dummy_dequeue,
761
762 .set_halt = dummy_set_halt,
763 .set_wedge = dummy_set_wedge,
764 };
765
766 /*-------------------------------------------------------------------------*/
767
768 /* there are both host and device side versions of this call ... */
769 static int dummy_g_get_frame(struct usb_gadget *_gadget)
770 {
771 struct timeval tv;
772
773 do_gettimeofday(&tv);
774 return tv.tv_usec / 1000;
775 }
776
777 static int dummy_wakeup(struct usb_gadget *_gadget)
778 {
779 struct dummy_hcd *dum_hcd;
780
781 dum_hcd = gadget_to_dummy_hcd(_gadget);
782 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
783 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
784 return -EINVAL;
785 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
786 return -ENOLINK;
787 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
788 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
789 return -EIO;
790
791 /* FIXME: What if the root hub is suspended but the port isn't? */
792
793 /* hub notices our request, issues downstream resume, etc */
794 dum_hcd->resuming = 1;
795 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
796 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
797 return 0;
798 }
799
800 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
801 {
802 struct dummy *dum;
803
804 dum = gadget_to_dummy_hcd(_gadget)->dum;
805 if (value)
806 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
807 else
808 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
809 return 0;
810 }
811
812 static void dummy_udc_update_ep0(struct dummy *dum)
813 {
814 if (dum->gadget.speed == USB_SPEED_SUPER)
815 dum->ep[0].ep.maxpacket = 9;
816 else
817 dum->ep[0].ep.maxpacket = 64;
818 }
819
820 static int dummy_pullup(struct usb_gadget *_gadget, int value)
821 {
822 struct dummy_hcd *dum_hcd;
823 struct dummy *dum;
824 unsigned long flags;
825
826 dum = gadget_dev_to_dummy(&_gadget->dev);
827
828 if (value && dum->driver) {
829 if (mod_data.is_super_speed)
830 dum->gadget.speed = dum->driver->max_speed;
831 else if (mod_data.is_high_speed)
832 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
833 dum->driver->max_speed);
834 else
835 dum->gadget.speed = USB_SPEED_FULL;
836 dummy_udc_update_ep0(dum);
837
838 if (dum->gadget.speed < dum->driver->max_speed)
839 dev_dbg(udc_dev(dum), "This device can perform faster"
840 " if you connect it to a %s port...\n",
841 usb_speed_string(dum->driver->max_speed));
842 }
843 dum_hcd = gadget_to_dummy_hcd(_gadget);
844
845 spin_lock_irqsave(&dum->lock, flags);
846 dum->pullup = (value != 0);
847 set_link_state(dum_hcd);
848 spin_unlock_irqrestore(&dum->lock, flags);
849
850 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
851 return 0;
852 }
853
854 static int dummy_udc_start(struct usb_gadget *g,
855 struct usb_gadget_driver *driver);
856 static int dummy_udc_stop(struct usb_gadget *g,
857 struct usb_gadget_driver *driver);
858
859 static const struct usb_gadget_ops dummy_ops = {
860 .get_frame = dummy_g_get_frame,
861 .wakeup = dummy_wakeup,
862 .set_selfpowered = dummy_set_selfpowered,
863 .pullup = dummy_pullup,
864 .udc_start = dummy_udc_start,
865 .udc_stop = dummy_udc_stop,
866 };
867
868 /*-------------------------------------------------------------------------*/
869
870 /* "function" sysfs attribute */
871 static ssize_t show_function(struct device *dev, struct device_attribute *attr,
872 char *buf)
873 {
874 struct dummy *dum = gadget_dev_to_dummy(dev);
875
876 if (!dum->driver || !dum->driver->function)
877 return 0;
878 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
879 }
880 static DEVICE_ATTR(function, S_IRUGO, show_function, NULL);
881
882 /*-------------------------------------------------------------------------*/
883
884 /*
885 * Driver registration/unregistration.
886 *
887 * This is basically hardware-specific; there's usually only one real USB
888 * device (not host) controller since that's how USB devices are intended
889 * to work. So most implementations of these api calls will rely on the
890 * fact that only one driver will ever bind to the hardware. But curious
891 * hardware can be built with discrete components, so the gadget API doesn't
892 * require that assumption.
893 *
894 * For this emulator, it might be convenient to create a usb slave device
895 * for each driver that registers: just add to a big root hub.
896 */
897
898 static int dummy_udc_start(struct usb_gadget *g,
899 struct usb_gadget_driver *driver)
900 {
901 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
902 struct dummy *dum = dum_hcd->dum;
903
904 if (driver->max_speed == USB_SPEED_UNKNOWN)
905 return -EINVAL;
906
907 /*
908 * SLAVE side init ... the layer above hardware, which
909 * can't enumerate without help from the driver we're binding.
910 */
911
912 dum->devstatus = 0;
913
914 dum->driver = driver;
915 dum->gadget.dev.driver = &driver->driver;
916 dev_dbg(udc_dev(dum), "binding gadget driver '%s'\n",
917 driver->driver.name);
918 return 0;
919 }
920
921 static int dummy_udc_stop(struct usb_gadget *g,
922 struct usb_gadget_driver *driver)
923 {
924 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
925 struct dummy *dum = dum_hcd->dum;
926
927 dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n",
928 driver->driver.name);
929
930 dum->gadget.dev.driver = NULL;
931 dum->driver = NULL;
932
933 return 0;
934 }
935
936 #undef is_enabled
937
938 /* The gadget structure is stored inside the hcd structure and will be
939 * released along with it. */
940 static void dummy_gadget_release(struct device *dev)
941 {
942 return;
943 }
944
945 static void init_dummy_udc_hw(struct dummy *dum)
946 {
947 int i;
948
949 INIT_LIST_HEAD(&dum->gadget.ep_list);
950 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
951 struct dummy_ep *ep = &dum->ep[i];
952
953 if (!ep_name[i])
954 break;
955 ep->ep.name = ep_name[i];
956 ep->ep.ops = &dummy_ep_ops;
957 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
958 ep->halted = ep->wedged = ep->already_seen =
959 ep->setup_stage = 0;
960 ep->ep.maxpacket = ~0;
961 ep->ep.max_streams = 16;
962 ep->last_io = jiffies;
963 ep->gadget = &dum->gadget;
964 ep->desc = NULL;
965 INIT_LIST_HEAD(&ep->queue);
966 }
967
968 dum->gadget.ep0 = &dum->ep[0].ep;
969 list_del_init(&dum->ep[0].ep.ep_list);
970 INIT_LIST_HEAD(&dum->fifo_req.queue);
971
972 #ifdef CONFIG_USB_OTG
973 dum->gadget.is_otg = 1;
974 #endif
975 }
976
977 static int dummy_udc_probe(struct platform_device *pdev)
978 {
979 struct dummy *dum;
980 int rc;
981
982 dum = *((void **)dev_get_platdata(&pdev->dev));
983 dum->gadget.name = gadget_name;
984 dum->gadget.ops = &dummy_ops;
985 dum->gadget.max_speed = USB_SPEED_SUPER;
986
987 dev_set_name(&dum->gadget.dev, "gadget");
988 dum->gadget.dev.parent = &pdev->dev;
989 dum->gadget.dev.release = dummy_gadget_release;
990 rc = device_register(&dum->gadget.dev);
991 if (rc < 0) {
992 put_device(&dum->gadget.dev);
993 return rc;
994 }
995
996 init_dummy_udc_hw(dum);
997
998 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
999 if (rc < 0)
1000 goto err_udc;
1001
1002 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1003 if (rc < 0)
1004 goto err_dev;
1005 platform_set_drvdata(pdev, dum);
1006 return rc;
1007
1008 err_dev:
1009 usb_del_gadget_udc(&dum->gadget);
1010 err_udc:
1011 device_unregister(&dum->gadget.dev);
1012 return rc;
1013 }
1014
1015 static int dummy_udc_remove(struct platform_device *pdev)
1016 {
1017 struct dummy *dum = platform_get_drvdata(pdev);
1018
1019 usb_del_gadget_udc(&dum->gadget);
1020 platform_set_drvdata(pdev, NULL);
1021 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1022 device_unregister(&dum->gadget.dev);
1023 return 0;
1024 }
1025
1026 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1027 int suspend)
1028 {
1029 spin_lock_irq(&dum->lock);
1030 dum->udc_suspended = suspend;
1031 set_link_state(dum_hcd);
1032 spin_unlock_irq(&dum->lock);
1033 }
1034
1035 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1036 {
1037 struct dummy *dum = platform_get_drvdata(pdev);
1038 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1039
1040 dev_dbg(&pdev->dev, "%s\n", __func__);
1041 dummy_udc_pm(dum, dum_hcd, 1);
1042 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1043 return 0;
1044 }
1045
1046 static int dummy_udc_resume(struct platform_device *pdev)
1047 {
1048 struct dummy *dum = platform_get_drvdata(pdev);
1049 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1050
1051 dev_dbg(&pdev->dev, "%s\n", __func__);
1052 dummy_udc_pm(dum, dum_hcd, 0);
1053 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1054 return 0;
1055 }
1056
1057 static struct platform_driver dummy_udc_driver = {
1058 .probe = dummy_udc_probe,
1059 .remove = dummy_udc_remove,
1060 .suspend = dummy_udc_suspend,
1061 .resume = dummy_udc_resume,
1062 .driver = {
1063 .name = (char *) gadget_name,
1064 .owner = THIS_MODULE,
1065 },
1066 };
1067
1068 /*-------------------------------------------------------------------------*/
1069
1070 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1071 {
1072 unsigned int index;
1073
1074 index = usb_endpoint_num(desc) << 1;
1075 if (usb_endpoint_dir_in(desc))
1076 index |= 1;
1077 return index;
1078 }
1079
1080 /* MASTER/HOST SIDE DRIVER
1081 *
1082 * this uses the hcd framework to hook up to host side drivers.
1083 * its root hub will only have one device, otherwise it acts like
1084 * a normal host controller.
1085 *
1086 * when urbs are queued, they're just stuck on a list that we
1087 * scan in a timer callback. that callback connects writes from
1088 * the host with reads from the device, and so on, based on the
1089 * usb 2.0 rules.
1090 */
1091
1092 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1093 {
1094 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1095 u32 index;
1096
1097 if (!usb_endpoint_xfer_bulk(desc))
1098 return 0;
1099
1100 index = dummy_get_ep_idx(desc);
1101 return (1 << index) & dum_hcd->stream_en_ep;
1102 }
1103
1104 /*
1105 * The max stream number is saved as a nibble so for the 30 possible endpoints
1106 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1107 * means we use only 1 stream). The maximum according to the spec is 16bit so
1108 * if the 16 stream limit is about to go, the array size should be incremented
1109 * to 30 elements of type u16.
1110 */
1111 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1112 unsigned int pipe)
1113 {
1114 int max_streams;
1115
1116 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1117 if (usb_pipeout(pipe))
1118 max_streams >>= 4;
1119 else
1120 max_streams &= 0xf;
1121 max_streams++;
1122 return max_streams;
1123 }
1124
1125 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1126 unsigned int pipe, unsigned int streams)
1127 {
1128 int max_streams;
1129
1130 streams--;
1131 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1132 if (usb_pipeout(pipe)) {
1133 streams <<= 4;
1134 max_streams &= 0xf;
1135 } else {
1136 max_streams &= 0xf0;
1137 }
1138 max_streams |= streams;
1139 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1140 }
1141
1142 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1143 {
1144 unsigned int max_streams;
1145 int enabled;
1146
1147 enabled = dummy_ep_stream_en(dum_hcd, urb);
1148 if (!urb->stream_id) {
1149 if (enabled)
1150 return -EINVAL;
1151 return 0;
1152 }
1153 if (!enabled)
1154 return -EINVAL;
1155
1156 max_streams = get_max_streams_for_pipe(dum_hcd,
1157 usb_pipeendpoint(urb->pipe));
1158 if (urb->stream_id > max_streams) {
1159 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1160 urb->stream_id);
1161 BUG();
1162 return -EINVAL;
1163 }
1164 return 0;
1165 }
1166
1167 static int dummy_urb_enqueue(
1168 struct usb_hcd *hcd,
1169 struct urb *urb,
1170 gfp_t mem_flags
1171 ) {
1172 struct dummy_hcd *dum_hcd;
1173 struct urbp *urbp;
1174 unsigned long flags;
1175 int rc;
1176
1177 urbp = kmalloc(sizeof *urbp, mem_flags);
1178 if (!urbp)
1179 return -ENOMEM;
1180 urbp->urb = urb;
1181 urbp->miter_started = 0;
1182
1183 dum_hcd = hcd_to_dummy_hcd(hcd);
1184 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1185
1186 rc = dummy_validate_stream(dum_hcd, urb);
1187 if (rc) {
1188 kfree(urbp);
1189 goto done;
1190 }
1191
1192 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1193 if (rc) {
1194 kfree(urbp);
1195 goto done;
1196 }
1197
1198 if (!dum_hcd->udev) {
1199 dum_hcd->udev = urb->dev;
1200 usb_get_dev(dum_hcd->udev);
1201 } else if (unlikely(dum_hcd->udev != urb->dev))
1202 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1203
1204 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1205 urb->hcpriv = urbp;
1206 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1207 urb->error_count = 1; /* mark as a new urb */
1208
1209 /* kick the scheduler, it'll do the rest */
1210 if (!timer_pending(&dum_hcd->timer))
1211 mod_timer(&dum_hcd->timer, jiffies + 1);
1212
1213 done:
1214 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1215 return rc;
1216 }
1217
1218 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1219 {
1220 struct dummy_hcd *dum_hcd;
1221 unsigned long flags;
1222 int rc;
1223
1224 /* giveback happens automatically in timer callback,
1225 * so make sure the callback happens */
1226 dum_hcd = hcd_to_dummy_hcd(hcd);
1227 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1228
1229 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1230 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1231 !list_empty(&dum_hcd->urbp_list))
1232 mod_timer(&dum_hcd->timer, jiffies);
1233
1234 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1235 return rc;
1236 }
1237
1238 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1239 u32 len)
1240 {
1241 void *ubuf, *rbuf;
1242 struct urbp *urbp = urb->hcpriv;
1243 int to_host;
1244 struct sg_mapping_iter *miter = &urbp->miter;
1245 u32 trans = 0;
1246 u32 this_sg;
1247 bool next_sg;
1248
1249 to_host = usb_pipein(urb->pipe);
1250 rbuf = req->req.buf + req->req.actual;
1251
1252 if (!urb->num_sgs) {
1253 ubuf = urb->transfer_buffer + urb->actual_length;
1254 if (to_host)
1255 memcpy(ubuf, rbuf, len);
1256 else
1257 memcpy(rbuf, ubuf, len);
1258 return len;
1259 }
1260
1261 if (!urbp->miter_started) {
1262 u32 flags = SG_MITER_ATOMIC;
1263
1264 if (to_host)
1265 flags |= SG_MITER_TO_SG;
1266 else
1267 flags |= SG_MITER_FROM_SG;
1268
1269 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1270 urbp->miter_started = 1;
1271 }
1272 next_sg = sg_miter_next(miter);
1273 if (next_sg == false) {
1274 WARN_ON_ONCE(1);
1275 return -EINVAL;
1276 }
1277 do {
1278 ubuf = miter->addr;
1279 this_sg = min_t(u32, len, miter->length);
1280 miter->consumed = this_sg;
1281 trans += this_sg;
1282
1283 if (to_host)
1284 memcpy(ubuf, rbuf, this_sg);
1285 else
1286 memcpy(rbuf, ubuf, this_sg);
1287 len -= this_sg;
1288
1289 if (!len)
1290 break;
1291 next_sg = sg_miter_next(miter);
1292 if (next_sg == false) {
1293 WARN_ON_ONCE(1);
1294 return -EINVAL;
1295 }
1296
1297 rbuf += this_sg;
1298 } while (1);
1299
1300 sg_miter_stop(miter);
1301 return trans;
1302 }
1303
1304 /* transfer up to a frame's worth; caller must own lock */
1305 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1306 struct dummy_ep *ep, int limit, int *status)
1307 {
1308 struct dummy *dum = dum_hcd->dum;
1309 struct dummy_request *req;
1310
1311 top:
1312 /* if there's no request queued, the device is NAKing; return */
1313 list_for_each_entry(req, &ep->queue, queue) {
1314 unsigned host_len, dev_len, len;
1315 int is_short, to_host;
1316 int rescan = 0;
1317
1318 if (dummy_ep_stream_en(dum_hcd, urb)) {
1319 if ((urb->stream_id != req->req.stream_id))
1320 continue;
1321 }
1322
1323 /* 1..N packets of ep->ep.maxpacket each ... the last one
1324 * may be short (including zero length).
1325 *
1326 * writer can send a zlp explicitly (length 0) or implicitly
1327 * (length mod maxpacket zero, and 'zero' flag); they always
1328 * terminate reads.
1329 */
1330 host_len = urb->transfer_buffer_length - urb->actual_length;
1331 dev_len = req->req.length - req->req.actual;
1332 len = min(host_len, dev_len);
1333
1334 /* FIXME update emulated data toggle too */
1335
1336 to_host = usb_pipein(urb->pipe);
1337 if (unlikely(len == 0))
1338 is_short = 1;
1339 else {
1340 /* not enough bandwidth left? */
1341 if (limit < ep->ep.maxpacket && limit < len)
1342 break;
1343 len = min_t(unsigned, len, limit);
1344 if (len == 0)
1345 break;
1346
1347 /* use an extra pass for the final short packet */
1348 if (len > ep->ep.maxpacket) {
1349 rescan = 1;
1350 len -= (len % ep->ep.maxpacket);
1351 }
1352 is_short = (len % ep->ep.maxpacket) != 0;
1353
1354 len = dummy_perform_transfer(urb, req, len);
1355
1356 ep->last_io = jiffies;
1357 if ((int)len < 0) {
1358 req->req.status = len;
1359 } else {
1360 limit -= len;
1361 urb->actual_length += len;
1362 req->req.actual += len;
1363 }
1364 }
1365
1366 /* short packets terminate, maybe with overflow/underflow.
1367 * it's only really an error to write too much.
1368 *
1369 * partially filling a buffer optionally blocks queue advances
1370 * (so completion handlers can clean up the queue) but we don't
1371 * need to emulate such data-in-flight.
1372 */
1373 if (is_short) {
1374 if (host_len == dev_len) {
1375 req->req.status = 0;
1376 *status = 0;
1377 } else if (to_host) {
1378 req->req.status = 0;
1379 if (dev_len > host_len)
1380 *status = -EOVERFLOW;
1381 else
1382 *status = 0;
1383 } else if (!to_host) {
1384 *status = 0;
1385 if (host_len > dev_len)
1386 req->req.status = -EOVERFLOW;
1387 else
1388 req->req.status = 0;
1389 }
1390
1391 /* many requests terminate without a short packet */
1392 } else {
1393 if (req->req.length == req->req.actual
1394 && !req->req.zero)
1395 req->req.status = 0;
1396 if (urb->transfer_buffer_length == urb->actual_length
1397 && !(urb->transfer_flags
1398 & URB_ZERO_PACKET))
1399 *status = 0;
1400 }
1401
1402 /* device side completion --> continuable */
1403 if (req->req.status != -EINPROGRESS) {
1404 list_del_init(&req->queue);
1405
1406 spin_unlock(&dum->lock);
1407 req->req.complete(&ep->ep, &req->req);
1408 spin_lock(&dum->lock);
1409
1410 /* requests might have been unlinked... */
1411 rescan = 1;
1412 }
1413
1414 /* host side completion --> terminate */
1415 if (*status != -EINPROGRESS)
1416 break;
1417
1418 /* rescan to continue with any other queued i/o */
1419 if (rescan)
1420 goto top;
1421 }
1422 return limit;
1423 }
1424
1425 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1426 {
1427 int limit = ep->ep.maxpacket;
1428
1429 if (dum->gadget.speed == USB_SPEED_HIGH) {
1430 int tmp;
1431
1432 /* high bandwidth mode */
1433 tmp = usb_endpoint_maxp(ep->desc);
1434 tmp = (tmp >> 11) & 0x03;
1435 tmp *= 8 /* applies to entire frame */;
1436 limit += limit * tmp;
1437 }
1438 if (dum->gadget.speed == USB_SPEED_SUPER) {
1439 switch (usb_endpoint_type(ep->desc)) {
1440 case USB_ENDPOINT_XFER_ISOC:
1441 /* Sec. 4.4.8.2 USB3.0 Spec */
1442 limit = 3 * 16 * 1024 * 8;
1443 break;
1444 case USB_ENDPOINT_XFER_INT:
1445 /* Sec. 4.4.7.2 USB3.0 Spec */
1446 limit = 3 * 1024 * 8;
1447 break;
1448 case USB_ENDPOINT_XFER_BULK:
1449 default:
1450 break;
1451 }
1452 }
1453 return limit;
1454 }
1455
1456 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1457 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1458 USB_PORT_STAT_SUSPEND)) \
1459 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1460
1461 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1462 {
1463 int i;
1464
1465 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1466 dum->ss_hcd : dum->hs_hcd)))
1467 return NULL;
1468 if ((address & ~USB_DIR_IN) == 0)
1469 return &dum->ep[0];
1470 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1471 struct dummy_ep *ep = &dum->ep[i];
1472
1473 if (!ep->desc)
1474 continue;
1475 if (ep->desc->bEndpointAddress == address)
1476 return ep;
1477 }
1478 return NULL;
1479 }
1480
1481 #undef is_active
1482
1483 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1484 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1485 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1486 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1487 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1488 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1489
1490
1491 /**
1492 * handle_control_request() - handles all control transfers
1493 * @dum: pointer to dummy (the_controller)
1494 * @urb: the urb request to handle
1495 * @setup: pointer to the setup data for a USB device control
1496 * request
1497 * @status: pointer to request handling status
1498 *
1499 * Return 0 - if the request was handled
1500 * 1 - if the request wasn't handles
1501 * error code on error
1502 */
1503 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1504 struct usb_ctrlrequest *setup,
1505 int *status)
1506 {
1507 struct dummy_ep *ep2;
1508 struct dummy *dum = dum_hcd->dum;
1509 int ret_val = 1;
1510 unsigned w_index;
1511 unsigned w_value;
1512
1513 w_index = le16_to_cpu(setup->wIndex);
1514 w_value = le16_to_cpu(setup->wValue);
1515 switch (setup->bRequest) {
1516 case USB_REQ_SET_ADDRESS:
1517 if (setup->bRequestType != Dev_Request)
1518 break;
1519 dum->address = w_value;
1520 *status = 0;
1521 dev_dbg(udc_dev(dum), "set_address = %d\n",
1522 w_value);
1523 ret_val = 0;
1524 break;
1525 case USB_REQ_SET_FEATURE:
1526 if (setup->bRequestType == Dev_Request) {
1527 ret_val = 0;
1528 switch (w_value) {
1529 case USB_DEVICE_REMOTE_WAKEUP:
1530 break;
1531 case USB_DEVICE_B_HNP_ENABLE:
1532 dum->gadget.b_hnp_enable = 1;
1533 break;
1534 case USB_DEVICE_A_HNP_SUPPORT:
1535 dum->gadget.a_hnp_support = 1;
1536 break;
1537 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1538 dum->gadget.a_alt_hnp_support = 1;
1539 break;
1540 case USB_DEVICE_U1_ENABLE:
1541 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1542 HCD_USB3)
1543 w_value = USB_DEV_STAT_U1_ENABLED;
1544 else
1545 ret_val = -EOPNOTSUPP;
1546 break;
1547 case USB_DEVICE_U2_ENABLE:
1548 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1549 HCD_USB3)
1550 w_value = USB_DEV_STAT_U2_ENABLED;
1551 else
1552 ret_val = -EOPNOTSUPP;
1553 break;
1554 case USB_DEVICE_LTM_ENABLE:
1555 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1556 HCD_USB3)
1557 w_value = USB_DEV_STAT_LTM_ENABLED;
1558 else
1559 ret_val = -EOPNOTSUPP;
1560 break;
1561 default:
1562 ret_val = -EOPNOTSUPP;
1563 }
1564 if (ret_val == 0) {
1565 dum->devstatus |= (1 << w_value);
1566 *status = 0;
1567 }
1568 } else if (setup->bRequestType == Ep_Request) {
1569 /* endpoint halt */
1570 ep2 = find_endpoint(dum, w_index);
1571 if (!ep2 || ep2->ep.name == ep0name) {
1572 ret_val = -EOPNOTSUPP;
1573 break;
1574 }
1575 ep2->halted = 1;
1576 ret_val = 0;
1577 *status = 0;
1578 }
1579 break;
1580 case USB_REQ_CLEAR_FEATURE:
1581 if (setup->bRequestType == Dev_Request) {
1582 ret_val = 0;
1583 switch (w_value) {
1584 case USB_DEVICE_REMOTE_WAKEUP:
1585 w_value = USB_DEVICE_REMOTE_WAKEUP;
1586 break;
1587 case USB_DEVICE_U1_ENABLE:
1588 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1589 HCD_USB3)
1590 w_value = USB_DEV_STAT_U1_ENABLED;
1591 else
1592 ret_val = -EOPNOTSUPP;
1593 break;
1594 case USB_DEVICE_U2_ENABLE:
1595 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1596 HCD_USB3)
1597 w_value = USB_DEV_STAT_U2_ENABLED;
1598 else
1599 ret_val = -EOPNOTSUPP;
1600 break;
1601 case USB_DEVICE_LTM_ENABLE:
1602 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1603 HCD_USB3)
1604 w_value = USB_DEV_STAT_LTM_ENABLED;
1605 else
1606 ret_val = -EOPNOTSUPP;
1607 break;
1608 default:
1609 ret_val = -EOPNOTSUPP;
1610 break;
1611 }
1612 if (ret_val == 0) {
1613 dum->devstatus &= ~(1 << w_value);
1614 *status = 0;
1615 }
1616 } else if (setup->bRequestType == Ep_Request) {
1617 /* endpoint halt */
1618 ep2 = find_endpoint(dum, w_index);
1619 if (!ep2) {
1620 ret_val = -EOPNOTSUPP;
1621 break;
1622 }
1623 if (!ep2->wedged)
1624 ep2->halted = 0;
1625 ret_val = 0;
1626 *status = 0;
1627 }
1628 break;
1629 case USB_REQ_GET_STATUS:
1630 if (setup->bRequestType == Dev_InRequest
1631 || setup->bRequestType == Intf_InRequest
1632 || setup->bRequestType == Ep_InRequest) {
1633 char *buf;
1634 /*
1635 * device: remote wakeup, selfpowered
1636 * interface: nothing
1637 * endpoint: halt
1638 */
1639 buf = (char *)urb->transfer_buffer;
1640 if (urb->transfer_buffer_length > 0) {
1641 if (setup->bRequestType == Ep_InRequest) {
1642 ep2 = find_endpoint(dum, w_index);
1643 if (!ep2) {
1644 ret_val = -EOPNOTSUPP;
1645 break;
1646 }
1647 buf[0] = ep2->halted;
1648 } else if (setup->bRequestType ==
1649 Dev_InRequest) {
1650 buf[0] = (u8)dum->devstatus;
1651 } else
1652 buf[0] = 0;
1653 }
1654 if (urb->transfer_buffer_length > 1)
1655 buf[1] = 0;
1656 urb->actual_length = min_t(u32, 2,
1657 urb->transfer_buffer_length);
1658 ret_val = 0;
1659 *status = 0;
1660 }
1661 break;
1662 }
1663 return ret_val;
1664 }
1665
1666 /* drive both sides of the transfers; looks like irq handlers to
1667 * both drivers except the callbacks aren't in_irq().
1668 */
1669 static void dummy_timer(unsigned long _dum_hcd)
1670 {
1671 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1672 struct dummy *dum = dum_hcd->dum;
1673 struct urbp *urbp, *tmp;
1674 unsigned long flags;
1675 int limit, total;
1676 int i;
1677
1678 /* simplistic model for one frame's bandwidth */
1679 switch (dum->gadget.speed) {
1680 case USB_SPEED_LOW:
1681 total = 8/*bytes*/ * 12/*packets*/;
1682 break;
1683 case USB_SPEED_FULL:
1684 total = 64/*bytes*/ * 19/*packets*/;
1685 break;
1686 case USB_SPEED_HIGH:
1687 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1688 break;
1689 case USB_SPEED_SUPER:
1690 /* Bus speed is 500000 bytes/ms, so use a little less */
1691 total = 490000;
1692 break;
1693 default:
1694 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1695 return;
1696 }
1697
1698 /* FIXME if HZ != 1000 this will probably misbehave ... */
1699
1700 /* look at each urb queued by the host side driver */
1701 spin_lock_irqsave(&dum->lock, flags);
1702
1703 if (!dum_hcd->udev) {
1704 dev_err(dummy_dev(dum_hcd),
1705 "timer fired with no URBs pending?\n");
1706 spin_unlock_irqrestore(&dum->lock, flags);
1707 return;
1708 }
1709
1710 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1711 if (!ep_name[i])
1712 break;
1713 dum->ep[i].already_seen = 0;
1714 }
1715
1716 restart:
1717 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1718 struct urb *urb;
1719 struct dummy_request *req;
1720 u8 address;
1721 struct dummy_ep *ep = NULL;
1722 int type;
1723 int status = -EINPROGRESS;
1724
1725 urb = urbp->urb;
1726 if (urb->unlinked)
1727 goto return_urb;
1728 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1729 continue;
1730 type = usb_pipetype(urb->pipe);
1731
1732 /* used up this frame's non-periodic bandwidth?
1733 * FIXME there's infinite bandwidth for control and
1734 * periodic transfers ... unrealistic.
1735 */
1736 if (total <= 0 && type == PIPE_BULK)
1737 continue;
1738
1739 /* find the gadget's ep for this request (if configured) */
1740 address = usb_pipeendpoint (urb->pipe);
1741 if (usb_pipein(urb->pipe))
1742 address |= USB_DIR_IN;
1743 ep = find_endpoint(dum, address);
1744 if (!ep) {
1745 /* set_configuration() disagreement */
1746 dev_dbg(dummy_dev(dum_hcd),
1747 "no ep configured for urb %p\n",
1748 urb);
1749 status = -EPROTO;
1750 goto return_urb;
1751 }
1752
1753 if (ep->already_seen)
1754 continue;
1755 ep->already_seen = 1;
1756 if (ep == &dum->ep[0] && urb->error_count) {
1757 ep->setup_stage = 1; /* a new urb */
1758 urb->error_count = 0;
1759 }
1760 if (ep->halted && !ep->setup_stage) {
1761 /* NOTE: must not be iso! */
1762 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1763 ep->ep.name, urb);
1764 status = -EPIPE;
1765 goto return_urb;
1766 }
1767 /* FIXME make sure both ends agree on maxpacket */
1768
1769 /* handle control requests */
1770 if (ep == &dum->ep[0] && ep->setup_stage) {
1771 struct usb_ctrlrequest setup;
1772 int value = 1;
1773
1774 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1775 /* paranoia, in case of stale queued data */
1776 list_for_each_entry(req, &ep->queue, queue) {
1777 list_del_init(&req->queue);
1778 req->req.status = -EOVERFLOW;
1779 dev_dbg(udc_dev(dum), "stale req = %p\n",
1780 req);
1781
1782 spin_unlock(&dum->lock);
1783 req->req.complete(&ep->ep, &req->req);
1784 spin_lock(&dum->lock);
1785 ep->already_seen = 0;
1786 goto restart;
1787 }
1788
1789 /* gadget driver never sees set_address or operations
1790 * on standard feature flags. some hardware doesn't
1791 * even expose them.
1792 */
1793 ep->last_io = jiffies;
1794 ep->setup_stage = 0;
1795 ep->halted = 0;
1796
1797 value = handle_control_request(dum_hcd, urb, &setup,
1798 &status);
1799
1800 /* gadget driver handles all other requests. block
1801 * until setup() returns; no reentrancy issues etc.
1802 */
1803 if (value > 0) {
1804 spin_unlock(&dum->lock);
1805 value = dum->driver->setup(&dum->gadget,
1806 &setup);
1807 spin_lock(&dum->lock);
1808
1809 if (value >= 0) {
1810 /* no delays (max 64KB data stage) */
1811 limit = 64*1024;
1812 goto treat_control_like_bulk;
1813 }
1814 /* error, see below */
1815 }
1816
1817 if (value < 0) {
1818 if (value != -EOPNOTSUPP)
1819 dev_dbg(udc_dev(dum),
1820 "setup --> %d\n",
1821 value);
1822 status = -EPIPE;
1823 urb->actual_length = 0;
1824 }
1825
1826 goto return_urb;
1827 }
1828
1829 /* non-control requests */
1830 limit = total;
1831 switch (usb_pipetype(urb->pipe)) {
1832 case PIPE_ISOCHRONOUS:
1833 /* FIXME is it urb->interval since the last xfer?
1834 * use urb->iso_frame_desc[i].
1835 * complete whether or not ep has requests queued.
1836 * report random errors, to debug drivers.
1837 */
1838 limit = max(limit, periodic_bytes(dum, ep));
1839 status = -ENOSYS;
1840 break;
1841
1842 case PIPE_INTERRUPT:
1843 /* FIXME is it urb->interval since the last xfer?
1844 * this almost certainly polls too fast.
1845 */
1846 limit = max(limit, periodic_bytes(dum, ep));
1847 /* FALLTHROUGH */
1848
1849 default:
1850 treat_control_like_bulk:
1851 ep->last_io = jiffies;
1852 total = transfer(dum_hcd, urb, ep, limit, &status);
1853 break;
1854 }
1855
1856 /* incomplete transfer? */
1857 if (status == -EINPROGRESS)
1858 continue;
1859
1860 return_urb:
1861 list_del(&urbp->urbp_list);
1862 kfree(urbp);
1863 if (ep)
1864 ep->already_seen = ep->setup_stage = 0;
1865
1866 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1867 spin_unlock(&dum->lock);
1868 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1869 spin_lock(&dum->lock);
1870
1871 goto restart;
1872 }
1873
1874 if (list_empty(&dum_hcd->urbp_list)) {
1875 usb_put_dev(dum_hcd->udev);
1876 dum_hcd->udev = NULL;
1877 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1878 /* want a 1 msec delay here */
1879 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1880 }
1881
1882 spin_unlock_irqrestore(&dum->lock, flags);
1883 }
1884
1885 /*-------------------------------------------------------------------------*/
1886
1887 #define PORT_C_MASK \
1888 ((USB_PORT_STAT_C_CONNECTION \
1889 | USB_PORT_STAT_C_ENABLE \
1890 | USB_PORT_STAT_C_SUSPEND \
1891 | USB_PORT_STAT_C_OVERCURRENT \
1892 | USB_PORT_STAT_C_RESET) << 16)
1893
1894 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1895 {
1896 struct dummy_hcd *dum_hcd;
1897 unsigned long flags;
1898 int retval = 0;
1899
1900 dum_hcd = hcd_to_dummy_hcd(hcd);
1901
1902 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1903 if (!HCD_HW_ACCESSIBLE(hcd))
1904 goto done;
1905
1906 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1907 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1908 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1909 set_link_state(dum_hcd);
1910 }
1911
1912 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1913 *buf = (1 << 1);
1914 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1915 dum_hcd->port_status);
1916 retval = 1;
1917 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1918 usb_hcd_resume_root_hub(hcd);
1919 }
1920 done:
1921 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1922 return retval;
1923 }
1924
1925 /* usb 3.0 root hub device descriptor */
1926 struct {
1927 struct usb_bos_descriptor bos;
1928 struct usb_ss_cap_descriptor ss_cap;
1929 } __packed usb3_bos_desc = {
1930
1931 .bos = {
1932 .bLength = USB_DT_BOS_SIZE,
1933 .bDescriptorType = USB_DT_BOS,
1934 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
1935 .bNumDeviceCaps = 1,
1936 },
1937 .ss_cap = {
1938 .bLength = USB_DT_USB_SS_CAP_SIZE,
1939 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
1940 .bDevCapabilityType = USB_SS_CAP_TYPE,
1941 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
1942 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
1943 },
1944 };
1945
1946 static inline void
1947 ss_hub_descriptor(struct usb_hub_descriptor *desc)
1948 {
1949 memset(desc, 0, sizeof *desc);
1950 desc->bDescriptorType = 0x2a;
1951 desc->bDescLength = 12;
1952 desc->wHubCharacteristics = cpu_to_le16(0x0001);
1953 desc->bNbrPorts = 1;
1954 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
1955 desc->u.ss.DeviceRemovable = 0xffff;
1956 }
1957
1958 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
1959 {
1960 memset(desc, 0, sizeof *desc);
1961 desc->bDescriptorType = 0x29;
1962 desc->bDescLength = 9;
1963 desc->wHubCharacteristics = cpu_to_le16(0x0001);
1964 desc->bNbrPorts = 1;
1965 desc->u.hs.DeviceRemovable[0] = 0xff;
1966 desc->u.hs.DeviceRemovable[1] = 0xff;
1967 }
1968
1969 static int dummy_hub_control(
1970 struct usb_hcd *hcd,
1971 u16 typeReq,
1972 u16 wValue,
1973 u16 wIndex,
1974 char *buf,
1975 u16 wLength
1976 ) {
1977 struct dummy_hcd *dum_hcd;
1978 int retval = 0;
1979 unsigned long flags;
1980
1981 if (!HCD_HW_ACCESSIBLE(hcd))
1982 return -ETIMEDOUT;
1983
1984 dum_hcd = hcd_to_dummy_hcd(hcd);
1985
1986 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1987 switch (typeReq) {
1988 case ClearHubFeature:
1989 break;
1990 case ClearPortFeature:
1991 switch (wValue) {
1992 case USB_PORT_FEAT_SUSPEND:
1993 if (hcd->speed == HCD_USB3) {
1994 dev_dbg(dummy_dev(dum_hcd),
1995 "USB_PORT_FEAT_SUSPEND req not "
1996 "supported for USB 3.0 roothub\n");
1997 goto error;
1998 }
1999 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2000 /* 20msec resume signaling */
2001 dum_hcd->resuming = 1;
2002 dum_hcd->re_timeout = jiffies +
2003 msecs_to_jiffies(20);
2004 }
2005 break;
2006 case USB_PORT_FEAT_POWER:
2007 if (hcd->speed == HCD_USB3) {
2008 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
2009 dev_dbg(dummy_dev(dum_hcd),
2010 "power-off\n");
2011 } else
2012 if (dum_hcd->port_status &
2013 USB_SS_PORT_STAT_POWER)
2014 dev_dbg(dummy_dev(dum_hcd),
2015 "power-off\n");
2016 /* FALLS THROUGH */
2017 default:
2018 dum_hcd->port_status &= ~(1 << wValue);
2019 set_link_state(dum_hcd);
2020 }
2021 break;
2022 case GetHubDescriptor:
2023 if (hcd->speed == HCD_USB3 &&
2024 (wLength < USB_DT_SS_HUB_SIZE ||
2025 wValue != (USB_DT_SS_HUB << 8))) {
2026 dev_dbg(dummy_dev(dum_hcd),
2027 "Wrong hub descriptor type for "
2028 "USB 3.0 roothub.\n");
2029 goto error;
2030 }
2031 if (hcd->speed == HCD_USB3)
2032 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2033 else
2034 hub_descriptor((struct usb_hub_descriptor *) buf);
2035 break;
2036
2037 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2038 if (hcd->speed != HCD_USB3)
2039 goto error;
2040
2041 if ((wValue >> 8) != USB_DT_BOS)
2042 goto error;
2043
2044 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2045 retval = sizeof(usb3_bos_desc);
2046 break;
2047
2048 case GetHubStatus:
2049 *(__le32 *) buf = cpu_to_le32(0);
2050 break;
2051 case GetPortStatus:
2052 if (wIndex != 1)
2053 retval = -EPIPE;
2054
2055 /* whoever resets or resumes must GetPortStatus to
2056 * complete it!!
2057 */
2058 if (dum_hcd->resuming &&
2059 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2060 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2061 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2062 }
2063 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2064 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2065 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2066 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2067 if (dum_hcd->dum->pullup) {
2068 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2069
2070 if (hcd->speed < HCD_USB3) {
2071 switch (dum_hcd->dum->gadget.speed) {
2072 case USB_SPEED_HIGH:
2073 dum_hcd->port_status |=
2074 USB_PORT_STAT_HIGH_SPEED;
2075 break;
2076 case USB_SPEED_LOW:
2077 dum_hcd->dum->gadget.ep0->
2078 maxpacket = 8;
2079 dum_hcd->port_status |=
2080 USB_PORT_STAT_LOW_SPEED;
2081 break;
2082 default:
2083 dum_hcd->dum->gadget.speed =
2084 USB_SPEED_FULL;
2085 break;
2086 }
2087 }
2088 }
2089 }
2090 set_link_state(dum_hcd);
2091 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2092 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2093 break;
2094 case SetHubFeature:
2095 retval = -EPIPE;
2096 break;
2097 case SetPortFeature:
2098 switch (wValue) {
2099 case USB_PORT_FEAT_LINK_STATE:
2100 if (hcd->speed != HCD_USB3) {
2101 dev_dbg(dummy_dev(dum_hcd),
2102 "USB_PORT_FEAT_LINK_STATE req not "
2103 "supported for USB 2.0 roothub\n");
2104 goto error;
2105 }
2106 /*
2107 * Since this is dummy we don't have an actual link so
2108 * there is nothing to do for the SET_LINK_STATE cmd
2109 */
2110 break;
2111 case USB_PORT_FEAT_U1_TIMEOUT:
2112 case USB_PORT_FEAT_U2_TIMEOUT:
2113 /* TODO: add suspend/resume support! */
2114 if (hcd->speed != HCD_USB3) {
2115 dev_dbg(dummy_dev(dum_hcd),
2116 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2117 "supported for USB 2.0 roothub\n");
2118 goto error;
2119 }
2120 break;
2121 case USB_PORT_FEAT_SUSPEND:
2122 /* Applicable only for USB2.0 hub */
2123 if (hcd->speed == HCD_USB3) {
2124 dev_dbg(dummy_dev(dum_hcd),
2125 "USB_PORT_FEAT_SUSPEND req not "
2126 "supported for USB 3.0 roothub\n");
2127 goto error;
2128 }
2129 if (dum_hcd->active) {
2130 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2131
2132 /* HNP would happen here; for now we
2133 * assume b_bus_req is always true.
2134 */
2135 set_link_state(dum_hcd);
2136 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2137 & dum_hcd->dum->devstatus) != 0)
2138 dev_dbg(dummy_dev(dum_hcd),
2139 "no HNP yet!\n");
2140 }
2141 break;
2142 case USB_PORT_FEAT_POWER:
2143 if (hcd->speed == HCD_USB3)
2144 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2145 else
2146 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2147 set_link_state(dum_hcd);
2148 break;
2149 case USB_PORT_FEAT_BH_PORT_RESET:
2150 /* Applicable only for USB3.0 hub */
2151 if (hcd->speed != HCD_USB3) {
2152 dev_dbg(dummy_dev(dum_hcd),
2153 "USB_PORT_FEAT_BH_PORT_RESET req not "
2154 "supported for USB 2.0 roothub\n");
2155 goto error;
2156 }
2157 /* FALLS THROUGH */
2158 case USB_PORT_FEAT_RESET:
2159 /* if it's already enabled, disable */
2160 if (hcd->speed == HCD_USB3) {
2161 dum_hcd->port_status = 0;
2162 dum_hcd->port_status =
2163 (USB_SS_PORT_STAT_POWER |
2164 USB_PORT_STAT_CONNECTION |
2165 USB_PORT_STAT_RESET);
2166 } else
2167 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2168 | USB_PORT_STAT_LOW_SPEED
2169 | USB_PORT_STAT_HIGH_SPEED);
2170 /*
2171 * We want to reset device status. All but the
2172 * Self powered feature
2173 */
2174 dum_hcd->dum->devstatus &=
2175 (1 << USB_DEVICE_SELF_POWERED);
2176 /*
2177 * FIXME USB3.0: what is the correct reset signaling
2178 * interval? Is it still 50msec as for HS?
2179 */
2180 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2181 /* FALLS THROUGH */
2182 default:
2183 if (hcd->speed == HCD_USB3) {
2184 if ((dum_hcd->port_status &
2185 USB_SS_PORT_STAT_POWER) != 0) {
2186 dum_hcd->port_status |= (1 << wValue);
2187 set_link_state(dum_hcd);
2188 }
2189 } else
2190 if ((dum_hcd->port_status &
2191 USB_PORT_STAT_POWER) != 0) {
2192 dum_hcd->port_status |= (1 << wValue);
2193 set_link_state(dum_hcd);
2194 }
2195 }
2196 break;
2197 case GetPortErrorCount:
2198 if (hcd->speed != HCD_USB3) {
2199 dev_dbg(dummy_dev(dum_hcd),
2200 "GetPortErrorCount req not "
2201 "supported for USB 2.0 roothub\n");
2202 goto error;
2203 }
2204 /* We'll always return 0 since this is a dummy hub */
2205 *(__le32 *) buf = cpu_to_le32(0);
2206 break;
2207 case SetHubDepth:
2208 if (hcd->speed != HCD_USB3) {
2209 dev_dbg(dummy_dev(dum_hcd),
2210 "SetHubDepth req not supported for "
2211 "USB 2.0 roothub\n");
2212 goto error;
2213 }
2214 break;
2215 default:
2216 dev_dbg(dummy_dev(dum_hcd),
2217 "hub control req%04x v%04x i%04x l%d\n",
2218 typeReq, wValue, wIndex, wLength);
2219 error:
2220 /* "protocol stall" on error */
2221 retval = -EPIPE;
2222 }
2223 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2224
2225 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2226 usb_hcd_poll_rh_status(hcd);
2227 return retval;
2228 }
2229
2230 static int dummy_bus_suspend(struct usb_hcd *hcd)
2231 {
2232 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2233
2234 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2235
2236 spin_lock_irq(&dum_hcd->dum->lock);
2237 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2238 set_link_state(dum_hcd);
2239 hcd->state = HC_STATE_SUSPENDED;
2240 spin_unlock_irq(&dum_hcd->dum->lock);
2241 return 0;
2242 }
2243
2244 static int dummy_bus_resume(struct usb_hcd *hcd)
2245 {
2246 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2247 int rc = 0;
2248
2249 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2250
2251 spin_lock_irq(&dum_hcd->dum->lock);
2252 if (!HCD_HW_ACCESSIBLE(hcd)) {
2253 rc = -ESHUTDOWN;
2254 } else {
2255 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2256 set_link_state(dum_hcd);
2257 if (!list_empty(&dum_hcd->urbp_list))
2258 mod_timer(&dum_hcd->timer, jiffies);
2259 hcd->state = HC_STATE_RUNNING;
2260 }
2261 spin_unlock_irq(&dum_hcd->dum->lock);
2262 return rc;
2263 }
2264
2265 /*-------------------------------------------------------------------------*/
2266
2267 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2268 {
2269 int ep = usb_pipeendpoint(urb->pipe);
2270
2271 return snprintf(buf, size,
2272 "urb/%p %s ep%d%s%s len %d/%d\n",
2273 urb,
2274 ({ char *s;
2275 switch (urb->dev->speed) {
2276 case USB_SPEED_LOW:
2277 s = "ls";
2278 break;
2279 case USB_SPEED_FULL:
2280 s = "fs";
2281 break;
2282 case USB_SPEED_HIGH:
2283 s = "hs";
2284 break;
2285 case USB_SPEED_SUPER:
2286 s = "ss";
2287 break;
2288 default:
2289 s = "?";
2290 break;
2291 }; s; }),
2292 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2293 ({ char *s; \
2294 switch (usb_pipetype(urb->pipe)) { \
2295 case PIPE_CONTROL: \
2296 s = ""; \
2297 break; \
2298 case PIPE_BULK: \
2299 s = "-bulk"; \
2300 break; \
2301 case PIPE_INTERRUPT: \
2302 s = "-int"; \
2303 break; \
2304 default: \
2305 s = "-iso"; \
2306 break; \
2307 }; s; }),
2308 urb->actual_length, urb->transfer_buffer_length);
2309 }
2310
2311 static ssize_t show_urbs(struct device *dev, struct device_attribute *attr,
2312 char *buf)
2313 {
2314 struct usb_hcd *hcd = dev_get_drvdata(dev);
2315 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2316 struct urbp *urbp;
2317 size_t size = 0;
2318 unsigned long flags;
2319
2320 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2321 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2322 size_t temp;
2323
2324 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2325 buf += temp;
2326 size += temp;
2327 }
2328 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2329
2330 return size;
2331 }
2332 static DEVICE_ATTR(urbs, S_IRUGO, show_urbs, NULL);
2333
2334 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2335 {
2336 init_timer(&dum_hcd->timer);
2337 dum_hcd->timer.function = dummy_timer;
2338 dum_hcd->timer.data = (unsigned long)dum_hcd;
2339 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2340 dum_hcd->stream_en_ep = 0;
2341 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2342 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2343 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2344 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2345 #ifdef CONFIG_USB_OTG
2346 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2347 #endif
2348 return 0;
2349
2350 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2351 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2352 }
2353
2354 static int dummy_start(struct usb_hcd *hcd)
2355 {
2356 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2357
2358 /*
2359 * MASTER side init ... we emulate a root hub that'll only ever
2360 * talk to one device (the slave side). Also appears in sysfs,
2361 * just like more familiar pci-based HCDs.
2362 */
2363 if (!usb_hcd_is_primary_hcd(hcd))
2364 return dummy_start_ss(dum_hcd);
2365
2366 spin_lock_init(&dum_hcd->dum->lock);
2367 init_timer(&dum_hcd->timer);
2368 dum_hcd->timer.function = dummy_timer;
2369 dum_hcd->timer.data = (unsigned long)dum_hcd;
2370 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2371
2372 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2373
2374 hcd->power_budget = POWER_BUDGET;
2375 hcd->state = HC_STATE_RUNNING;
2376 hcd->uses_new_polling = 1;
2377
2378 #ifdef CONFIG_USB_OTG
2379 hcd->self.otg_port = 1;
2380 #endif
2381
2382 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2383 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2384 }
2385
2386 static void dummy_stop(struct usb_hcd *hcd)
2387 {
2388 struct dummy *dum;
2389
2390 dum = hcd_to_dummy_hcd(hcd)->dum;
2391 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2392 usb_gadget_unregister_driver(dum->driver);
2393 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2394 }
2395
2396 /*-------------------------------------------------------------------------*/
2397
2398 static int dummy_h_get_frame(struct usb_hcd *hcd)
2399 {
2400 return dummy_g_get_frame(NULL);
2401 }
2402
2403 static int dummy_setup(struct usb_hcd *hcd)
2404 {
2405 struct dummy *dum;
2406
2407 dum = *((void **)dev_get_platdata(hcd->self.controller));
2408 hcd->self.sg_tablesize = ~0;
2409 if (usb_hcd_is_primary_hcd(hcd)) {
2410 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2411 dum->hs_hcd->dum = dum;
2412 /*
2413 * Mark the first roothub as being USB 2.0.
2414 * The USB 3.0 roothub will be registered later by
2415 * dummy_hcd_probe()
2416 */
2417 hcd->speed = HCD_USB2;
2418 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2419 } else {
2420 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2421 dum->ss_hcd->dum = dum;
2422 hcd->speed = HCD_USB3;
2423 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2424 }
2425 return 0;
2426 }
2427
2428 /* Change a group of bulk endpoints to support multiple stream IDs */
2429 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2430 struct usb_host_endpoint **eps, unsigned int num_eps,
2431 unsigned int num_streams, gfp_t mem_flags)
2432 {
2433 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2434 unsigned long flags;
2435 int max_stream;
2436 int ret_streams = num_streams;
2437 unsigned int index;
2438 unsigned int i;
2439
2440 if (!num_eps)
2441 return -EINVAL;
2442
2443 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2444 for (i = 0; i < num_eps; i++) {
2445 index = dummy_get_ep_idx(&eps[i]->desc);
2446 if ((1 << index) & dum_hcd->stream_en_ep) {
2447 ret_streams = -EINVAL;
2448 goto out;
2449 }
2450 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2451 if (!max_stream) {
2452 ret_streams = -EINVAL;
2453 goto out;
2454 }
2455 if (max_stream < ret_streams) {
2456 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2457 "stream IDs.\n",
2458 eps[i]->desc.bEndpointAddress,
2459 max_stream);
2460 ret_streams = max_stream;
2461 }
2462 }
2463
2464 for (i = 0; i < num_eps; i++) {
2465 index = dummy_get_ep_idx(&eps[i]->desc);
2466 dum_hcd->stream_en_ep |= 1 << index;
2467 set_max_streams_for_pipe(dum_hcd,
2468 usb_endpoint_num(&eps[i]->desc), ret_streams);
2469 }
2470 out:
2471 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2472 return ret_streams;
2473 }
2474
2475 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2476 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2477 struct usb_host_endpoint **eps, unsigned int num_eps,
2478 gfp_t mem_flags)
2479 {
2480 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2481 unsigned long flags;
2482 int ret;
2483 unsigned int index;
2484 unsigned int i;
2485
2486 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2487 for (i = 0; i < num_eps; i++) {
2488 index = dummy_get_ep_idx(&eps[i]->desc);
2489 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2490 ret = -EINVAL;
2491 goto out;
2492 }
2493 }
2494
2495 for (i = 0; i < num_eps; i++) {
2496 index = dummy_get_ep_idx(&eps[i]->desc);
2497 dum_hcd->stream_en_ep &= ~(1 << index);
2498 set_max_streams_for_pipe(dum_hcd,
2499 usb_endpoint_num(&eps[i]->desc), 0);
2500 }
2501 ret = 0;
2502 out:
2503 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2504 return ret;
2505 }
2506
2507 static struct hc_driver dummy_hcd = {
2508 .description = (char *) driver_name,
2509 .product_desc = "Dummy host controller",
2510 .hcd_priv_size = sizeof(struct dummy_hcd),
2511
2512 .flags = HCD_USB3 | HCD_SHARED,
2513
2514 .reset = dummy_setup,
2515 .start = dummy_start,
2516 .stop = dummy_stop,
2517
2518 .urb_enqueue = dummy_urb_enqueue,
2519 .urb_dequeue = dummy_urb_dequeue,
2520
2521 .get_frame_number = dummy_h_get_frame,
2522
2523 .hub_status_data = dummy_hub_status,
2524 .hub_control = dummy_hub_control,
2525 .bus_suspend = dummy_bus_suspend,
2526 .bus_resume = dummy_bus_resume,
2527
2528 .alloc_streams = dummy_alloc_streams,
2529 .free_streams = dummy_free_streams,
2530 };
2531
2532 static int dummy_hcd_probe(struct platform_device *pdev)
2533 {
2534 struct dummy *dum;
2535 struct usb_hcd *hs_hcd;
2536 struct usb_hcd *ss_hcd;
2537 int retval;
2538
2539 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2540 dum = *((void **)dev_get_platdata(&pdev->dev));
2541
2542 if (!mod_data.is_super_speed)
2543 dummy_hcd.flags = HCD_USB2;
2544 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2545 if (!hs_hcd)
2546 return -ENOMEM;
2547 hs_hcd->has_tt = 1;
2548
2549 retval = usb_add_hcd(hs_hcd, 0, 0);
2550 if (retval)
2551 goto put_usb2_hcd;
2552
2553 if (mod_data.is_super_speed) {
2554 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2555 dev_name(&pdev->dev), hs_hcd);
2556 if (!ss_hcd) {
2557 retval = -ENOMEM;
2558 goto dealloc_usb2_hcd;
2559 }
2560
2561 retval = usb_add_hcd(ss_hcd, 0, 0);
2562 if (retval)
2563 goto put_usb3_hcd;
2564 }
2565 return 0;
2566
2567 put_usb3_hcd:
2568 usb_put_hcd(ss_hcd);
2569 dealloc_usb2_hcd:
2570 usb_remove_hcd(hs_hcd);
2571 put_usb2_hcd:
2572 usb_put_hcd(hs_hcd);
2573 dum->hs_hcd = dum->ss_hcd = NULL;
2574 return retval;
2575 }
2576
2577 static int dummy_hcd_remove(struct platform_device *pdev)
2578 {
2579 struct dummy *dum;
2580
2581 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2582
2583 if (dum->ss_hcd) {
2584 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2585 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2586 }
2587
2588 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2589 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2590
2591 dum->hs_hcd = NULL;
2592 dum->ss_hcd = NULL;
2593
2594 return 0;
2595 }
2596
2597 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2598 {
2599 struct usb_hcd *hcd;
2600 struct dummy_hcd *dum_hcd;
2601 int rc = 0;
2602
2603 dev_dbg(&pdev->dev, "%s\n", __func__);
2604
2605 hcd = platform_get_drvdata(pdev);
2606 dum_hcd = hcd_to_dummy_hcd(hcd);
2607 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2608 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2609 rc = -EBUSY;
2610 } else
2611 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2612 return rc;
2613 }
2614
2615 static int dummy_hcd_resume(struct platform_device *pdev)
2616 {
2617 struct usb_hcd *hcd;
2618
2619 dev_dbg(&pdev->dev, "%s\n", __func__);
2620
2621 hcd = platform_get_drvdata(pdev);
2622 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2623 usb_hcd_poll_rh_status(hcd);
2624 return 0;
2625 }
2626
2627 static struct platform_driver dummy_hcd_driver = {
2628 .probe = dummy_hcd_probe,
2629 .remove = dummy_hcd_remove,
2630 .suspend = dummy_hcd_suspend,
2631 .resume = dummy_hcd_resume,
2632 .driver = {
2633 .name = (char *) driver_name,
2634 .owner = THIS_MODULE,
2635 },
2636 };
2637
2638 /*-------------------------------------------------------------------------*/
2639 #define MAX_NUM_UDC 2
2640 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2641 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2642
2643 static int __init init(void)
2644 {
2645 int retval = -ENOMEM;
2646 int i;
2647 struct dummy *dum[MAX_NUM_UDC];
2648
2649 if (usb_disabled())
2650 return -ENODEV;
2651
2652 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2653 return -EINVAL;
2654
2655 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2656 pr_err("Number of emulated UDC must be in range of 1…%d\n",
2657 MAX_NUM_UDC);
2658 return -EINVAL;
2659 }
2660
2661 for (i = 0; i < mod_data.num; i++) {
2662 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2663 if (!the_hcd_pdev[i]) {
2664 i--;
2665 while (i >= 0)
2666 platform_device_put(the_hcd_pdev[i--]);
2667 return retval;
2668 }
2669 }
2670 for (i = 0; i < mod_data.num; i++) {
2671 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2672 if (!the_udc_pdev[i]) {
2673 i--;
2674 while (i >= 0)
2675 platform_device_put(the_udc_pdev[i--]);
2676 goto err_alloc_udc;
2677 }
2678 }
2679 for (i = 0; i < mod_data.num; i++) {
2680 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2681 if (!dum[i])
2682 goto err_add_pdata;
2683 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2684 sizeof(void *));
2685 if (retval)
2686 goto err_add_pdata;
2687 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2688 sizeof(void *));
2689 if (retval)
2690 goto err_add_pdata;
2691 }
2692
2693 retval = platform_driver_register(&dummy_hcd_driver);
2694 if (retval < 0)
2695 goto err_add_pdata;
2696 retval = platform_driver_register(&dummy_udc_driver);
2697 if (retval < 0)
2698 goto err_register_udc_driver;
2699
2700 for (i = 0; i < mod_data.num; i++) {
2701 retval = platform_device_add(the_hcd_pdev[i]);
2702 if (retval < 0) {
2703 i--;
2704 while (i >= 0)
2705 platform_device_del(the_hcd_pdev[i--]);
2706 goto err_add_hcd;
2707 }
2708 }
2709 for (i = 0; i < mod_data.num; i++) {
2710 if (!dum[i]->hs_hcd ||
2711 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2712 /*
2713 * The hcd was added successfully but its probe
2714 * function failed for some reason.
2715 */
2716 retval = -EINVAL;
2717 goto err_add_udc;
2718 }
2719 }
2720
2721 for (i = 0; i < mod_data.num; i++) {
2722 retval = platform_device_add(the_udc_pdev[i]);
2723 if (retval < 0) {
2724 i--;
2725 while (i >= 0)
2726 platform_device_del(the_udc_pdev[i]);
2727 goto err_add_udc;
2728 }
2729 }
2730
2731 for (i = 0; i < mod_data.num; i++) {
2732 if (!platform_get_drvdata(the_udc_pdev[i])) {
2733 /*
2734 * The udc was added successfully but its probe
2735 * function failed for some reason.
2736 */
2737 retval = -EINVAL;
2738 goto err_probe_udc;
2739 }
2740 }
2741 return retval;
2742
2743 err_probe_udc:
2744 for (i = 0; i < mod_data.num; i++)
2745 platform_device_del(the_udc_pdev[i]);
2746 err_add_udc:
2747 for (i = 0; i < mod_data.num; i++)
2748 platform_device_del(the_hcd_pdev[i]);
2749 err_add_hcd:
2750 platform_driver_unregister(&dummy_udc_driver);
2751 err_register_udc_driver:
2752 platform_driver_unregister(&dummy_hcd_driver);
2753 err_add_pdata:
2754 for (i = 0; i < mod_data.num; i++)
2755 kfree(dum[i]);
2756 for (i = 0; i < mod_data.num; i++)
2757 platform_device_put(the_udc_pdev[i]);
2758 err_alloc_udc:
2759 for (i = 0; i < mod_data.num; i++)
2760 platform_device_put(the_hcd_pdev[i]);
2761 return retval;
2762 }
2763 module_init(init);
2764
2765 static void __exit cleanup(void)
2766 {
2767 int i;
2768
2769 for (i = 0; i < mod_data.num; i++) {
2770 struct dummy *dum;
2771
2772 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2773
2774 platform_device_unregister(the_udc_pdev[i]);
2775 platform_device_unregister(the_hcd_pdev[i]);
2776 kfree(dum);
2777 }
2778 platform_driver_unregister(&dummy_udc_driver);
2779 platform_driver_unregister(&dummy_hcd_driver);
2780 }
2781 module_exit(cleanup);
Linux kernel - Deliverables
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