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Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[deliverable/linux.git] / drivers / usb / gadget / udc / 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 struct {
131 const char *name;
132 const struct usb_ep_caps caps;
133 } ep_info[] = {
134 #define EP_INFO(_name, _caps) \
135 { \
136 .name = _name, \
137 .caps = _caps, \
138 }
139
140 /* everyone has ep0 */
141 EP_INFO(ep0name,
142 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
143 /* act like a pxa250: fifteen fixed function endpoints */
144 EP_INFO("ep1in-bulk",
145 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
146 EP_INFO("ep2out-bulk",
147 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
148 EP_INFO("ep3in-iso",
149 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
150 EP_INFO("ep4out-iso",
151 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
152 EP_INFO("ep5in-int",
153 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
154 EP_INFO("ep6in-bulk",
155 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
156 EP_INFO("ep7out-bulk",
157 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
158 EP_INFO("ep8in-iso",
159 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
160 EP_INFO("ep9out-iso",
161 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
162 EP_INFO("ep10in-int",
163 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
164 EP_INFO("ep11in-bulk",
165 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
166 EP_INFO("ep12out-bulk",
167 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
168 EP_INFO("ep13in-iso",
169 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
170 EP_INFO("ep14out-iso",
171 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
172 EP_INFO("ep15in-int",
173 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
174 /* or like sa1100: two fixed function endpoints */
175 EP_INFO("ep1out-bulk",
176 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
177 EP_INFO("ep2in-bulk",
178 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
179 /* and now some generic EPs so we have enough in multi config */
180 EP_INFO("ep3out",
181 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
182 EP_INFO("ep4in",
183 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
184 EP_INFO("ep5out",
185 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
186 EP_INFO("ep6out",
187 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
188 EP_INFO("ep7in",
189 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
190 EP_INFO("ep8out",
191 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
192 EP_INFO("ep9in",
193 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
194 EP_INFO("ep10out",
195 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
196 EP_INFO("ep11out",
197 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
198 EP_INFO("ep12in",
199 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
200 EP_INFO("ep13out",
201 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
202 EP_INFO("ep14in",
203 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
204 EP_INFO("ep15out",
205 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
206
207 #undef EP_INFO
208 };
209
210 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info)
211
212 /*-------------------------------------------------------------------------*/
213
214 #define FIFO_SIZE 64
215
216 struct urbp {
217 struct urb *urb;
218 struct list_head urbp_list;
219 struct sg_mapping_iter miter;
220 u32 miter_started;
221 };
222
223
224 enum dummy_rh_state {
225 DUMMY_RH_RESET,
226 DUMMY_RH_SUSPENDED,
227 DUMMY_RH_RUNNING
228 };
229
230 struct dummy_hcd {
231 struct dummy *dum;
232 enum dummy_rh_state rh_state;
233 struct timer_list timer;
234 u32 port_status;
235 u32 old_status;
236 unsigned long re_timeout;
237
238 struct usb_device *udev;
239 struct list_head urbp_list;
240 u32 stream_en_ep;
241 u8 num_stream[30 / 2];
242
243 unsigned active:1;
244 unsigned old_active:1;
245 unsigned resuming:1;
246 };
247
248 struct dummy {
249 spinlock_t lock;
250
251 /*
252 * SLAVE/GADGET side support
253 */
254 struct dummy_ep ep[DUMMY_ENDPOINTS];
255 int address;
256 struct usb_gadget gadget;
257 struct usb_gadget_driver *driver;
258 struct dummy_request fifo_req;
259 u8 fifo_buf[FIFO_SIZE];
260 u16 devstatus;
261 unsigned udc_suspended:1;
262 unsigned pullup:1;
263
264 /*
265 * MASTER/HOST side support
266 */
267 struct dummy_hcd *hs_hcd;
268 struct dummy_hcd *ss_hcd;
269 };
270
271 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
272 {
273 return (struct dummy_hcd *) (hcd->hcd_priv);
274 }
275
276 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
277 {
278 return container_of((void *) dum, struct usb_hcd, hcd_priv);
279 }
280
281 static inline struct device *dummy_dev(struct dummy_hcd *dum)
282 {
283 return dummy_hcd_to_hcd(dum)->self.controller;
284 }
285
286 static inline struct device *udc_dev(struct dummy *dum)
287 {
288 return dum->gadget.dev.parent;
289 }
290
291 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
292 {
293 return container_of(ep->gadget, struct dummy, gadget);
294 }
295
296 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
297 {
298 struct dummy *dum = container_of(gadget, struct dummy, gadget);
299 if (dum->gadget.speed == USB_SPEED_SUPER)
300 return dum->ss_hcd;
301 else
302 return dum->hs_hcd;
303 }
304
305 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
306 {
307 return container_of(dev, struct dummy, gadget.dev);
308 }
309
310 /*-------------------------------------------------------------------------*/
311
312 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
313
314 /* called with spinlock held */
315 static void nuke(struct dummy *dum, struct dummy_ep *ep)
316 {
317 while (!list_empty(&ep->queue)) {
318 struct dummy_request *req;
319
320 req = list_entry(ep->queue.next, struct dummy_request, queue);
321 list_del_init(&req->queue);
322 req->req.status = -ESHUTDOWN;
323
324 spin_unlock(&dum->lock);
325 usb_gadget_giveback_request(&ep->ep, &req->req);
326 spin_lock(&dum->lock);
327 }
328 }
329
330 /* caller must hold lock */
331 static void stop_activity(struct dummy *dum)
332 {
333 struct dummy_ep *ep;
334
335 /* prevent any more requests */
336 dum->address = 0;
337
338 /* The timer is left running so that outstanding URBs can fail */
339
340 /* nuke any pending requests first, so driver i/o is quiesced */
341 list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list)
342 nuke(dum, ep);
343
344 /* driver now does any non-usb quiescing necessary */
345 }
346
347 /**
348 * set_link_state_by_speed() - Sets the current state of the link according to
349 * the hcd speed
350 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
351 *
352 * This function updates the port_status according to the link state and the
353 * speed of the hcd.
354 */
355 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
356 {
357 struct dummy *dum = dum_hcd->dum;
358
359 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
360 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
361 dum_hcd->port_status = 0;
362 } else if (!dum->pullup || dum->udc_suspended) {
363 /* UDC suspend must cause a disconnect */
364 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
365 USB_PORT_STAT_ENABLE);
366 if ((dum_hcd->old_status &
367 USB_PORT_STAT_CONNECTION) != 0)
368 dum_hcd->port_status |=
369 (USB_PORT_STAT_C_CONNECTION << 16);
370 } else {
371 /* device is connected and not suspended */
372 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
373 USB_PORT_STAT_SPEED_5GBPS) ;
374 if ((dum_hcd->old_status &
375 USB_PORT_STAT_CONNECTION) == 0)
376 dum_hcd->port_status |=
377 (USB_PORT_STAT_C_CONNECTION << 16);
378 if ((dum_hcd->port_status &
379 USB_PORT_STAT_ENABLE) == 1 &&
380 (dum_hcd->port_status &
381 USB_SS_PORT_LS_U0) == 1 &&
382 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
383 dum_hcd->active = 1;
384 }
385 } else {
386 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
387 dum_hcd->port_status = 0;
388 } else if (!dum->pullup || dum->udc_suspended) {
389 /* UDC suspend must cause a disconnect */
390 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
391 USB_PORT_STAT_ENABLE |
392 USB_PORT_STAT_LOW_SPEED |
393 USB_PORT_STAT_HIGH_SPEED |
394 USB_PORT_STAT_SUSPEND);
395 if ((dum_hcd->old_status &
396 USB_PORT_STAT_CONNECTION) != 0)
397 dum_hcd->port_status |=
398 (USB_PORT_STAT_C_CONNECTION << 16);
399 } else {
400 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
401 if ((dum_hcd->old_status &
402 USB_PORT_STAT_CONNECTION) == 0)
403 dum_hcd->port_status |=
404 (USB_PORT_STAT_C_CONNECTION << 16);
405 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
406 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
407 else if ((dum_hcd->port_status &
408 USB_PORT_STAT_SUSPEND) == 0 &&
409 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
410 dum_hcd->active = 1;
411 }
412 }
413 }
414
415 /* caller must hold lock */
416 static void set_link_state(struct dummy_hcd *dum_hcd)
417 {
418 struct dummy *dum = dum_hcd->dum;
419
420 dum_hcd->active = 0;
421 if (dum->pullup)
422 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
423 dum->gadget.speed != USB_SPEED_SUPER) ||
424 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
425 dum->gadget.speed == USB_SPEED_SUPER))
426 return;
427
428 set_link_state_by_speed(dum_hcd);
429
430 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
431 dum_hcd->active)
432 dum_hcd->resuming = 0;
433
434 /* Currently !connected or in reset */
435 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
436 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
437 unsigned disconnect = USB_PORT_STAT_CONNECTION &
438 dum_hcd->old_status & (~dum_hcd->port_status);
439 unsigned reset = USB_PORT_STAT_RESET &
440 (~dum_hcd->old_status) & dum_hcd->port_status;
441
442 /* Report reset and disconnect events to the driver */
443 if (dum->driver && (disconnect || reset)) {
444 stop_activity(dum);
445 spin_unlock(&dum->lock);
446 if (reset)
447 usb_gadget_udc_reset(&dum->gadget, dum->driver);
448 else
449 dum->driver->disconnect(&dum->gadget);
450 spin_lock(&dum->lock);
451 }
452 } else if (dum_hcd->active != dum_hcd->old_active) {
453 if (dum_hcd->old_active && dum->driver->suspend) {
454 spin_unlock(&dum->lock);
455 dum->driver->suspend(&dum->gadget);
456 spin_lock(&dum->lock);
457 } else if (!dum_hcd->old_active && dum->driver->resume) {
458 spin_unlock(&dum->lock);
459 dum->driver->resume(&dum->gadget);
460 spin_lock(&dum->lock);
461 }
462 }
463
464 dum_hcd->old_status = dum_hcd->port_status;
465 dum_hcd->old_active = dum_hcd->active;
466 }
467
468 /*-------------------------------------------------------------------------*/
469
470 /* SLAVE/GADGET SIDE DRIVER
471 *
472 * This only tracks gadget state. All the work is done when the host
473 * side tries some (emulated) i/o operation. Real device controller
474 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
475 */
476
477 #define is_enabled(dum) \
478 (dum->port_status & USB_PORT_STAT_ENABLE)
479
480 static int dummy_enable(struct usb_ep *_ep,
481 const struct usb_endpoint_descriptor *desc)
482 {
483 struct dummy *dum;
484 struct dummy_hcd *dum_hcd;
485 struct dummy_ep *ep;
486 unsigned max;
487 int retval;
488
489 ep = usb_ep_to_dummy_ep(_ep);
490 if (!_ep || !desc || ep->desc || _ep->name == ep0name
491 || desc->bDescriptorType != USB_DT_ENDPOINT)
492 return -EINVAL;
493 dum = ep_to_dummy(ep);
494 if (!dum->driver)
495 return -ESHUTDOWN;
496
497 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
498 if (!is_enabled(dum_hcd))
499 return -ESHUTDOWN;
500
501 /*
502 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
503 * maximum packet size.
504 * For SS devices the wMaxPacketSize is limited by 1024.
505 */
506 max = usb_endpoint_maxp(desc) & 0x7ff;
507
508 /* drivers must not request bad settings, since lower levels
509 * (hardware or its drivers) may not check. some endpoints
510 * can't do iso, many have maxpacket limitations, etc.
511 *
512 * since this "hardware" driver is here to help debugging, we
513 * have some extra sanity checks. (there could be more though,
514 * especially for "ep9out" style fixed function ones.)
515 */
516 retval = -EINVAL;
517 switch (usb_endpoint_type(desc)) {
518 case USB_ENDPOINT_XFER_BULK:
519 if (strstr(ep->ep.name, "-iso")
520 || strstr(ep->ep.name, "-int")) {
521 goto done;
522 }
523 switch (dum->gadget.speed) {
524 case USB_SPEED_SUPER:
525 if (max == 1024)
526 break;
527 goto done;
528 case USB_SPEED_HIGH:
529 if (max == 512)
530 break;
531 goto done;
532 case USB_SPEED_FULL:
533 if (max == 8 || max == 16 || max == 32 || max == 64)
534 /* we'll fake any legal size */
535 break;
536 /* save a return statement */
537 default:
538 goto done;
539 }
540 break;
541 case USB_ENDPOINT_XFER_INT:
542 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
543 goto done;
544 /* real hardware might not handle all packet sizes */
545 switch (dum->gadget.speed) {
546 case USB_SPEED_SUPER:
547 case USB_SPEED_HIGH:
548 if (max <= 1024)
549 break;
550 /* save a return statement */
551 case USB_SPEED_FULL:
552 if (max <= 64)
553 break;
554 /* save a return statement */
555 default:
556 if (max <= 8)
557 break;
558 goto done;
559 }
560 break;
561 case USB_ENDPOINT_XFER_ISOC:
562 if (strstr(ep->ep.name, "-bulk")
563 || strstr(ep->ep.name, "-int"))
564 goto done;
565 /* real hardware might not handle all packet sizes */
566 switch (dum->gadget.speed) {
567 case USB_SPEED_SUPER:
568 case USB_SPEED_HIGH:
569 if (max <= 1024)
570 break;
571 /* save a return statement */
572 case USB_SPEED_FULL:
573 if (max <= 1023)
574 break;
575 /* save a return statement */
576 default:
577 goto done;
578 }
579 break;
580 default:
581 /* few chips support control except on ep0 */
582 goto done;
583 }
584
585 _ep->maxpacket = max;
586 if (usb_ss_max_streams(_ep->comp_desc)) {
587 if (!usb_endpoint_xfer_bulk(desc)) {
588 dev_err(udc_dev(dum), "Can't enable stream support on "
589 "non-bulk ep %s\n", _ep->name);
590 return -EINVAL;
591 }
592 ep->stream_en = 1;
593 }
594 ep->desc = desc;
595
596 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
597 _ep->name,
598 desc->bEndpointAddress & 0x0f,
599 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
600 ({ char *val;
601 switch (usb_endpoint_type(desc)) {
602 case USB_ENDPOINT_XFER_BULK:
603 val = "bulk";
604 break;
605 case USB_ENDPOINT_XFER_ISOC:
606 val = "iso";
607 break;
608 case USB_ENDPOINT_XFER_INT:
609 val = "intr";
610 break;
611 default:
612 val = "ctrl";
613 break;
614 } val; }),
615 max, ep->stream_en ? "enabled" : "disabled");
616
617 /* at this point real hardware should be NAKing transfers
618 * to that endpoint, until a buffer is queued to it.
619 */
620 ep->halted = ep->wedged = 0;
621 retval = 0;
622 done:
623 return retval;
624 }
625
626 static int dummy_disable(struct usb_ep *_ep)
627 {
628 struct dummy_ep *ep;
629 struct dummy *dum;
630 unsigned long flags;
631
632 ep = usb_ep_to_dummy_ep(_ep);
633 if (!_ep || !ep->desc || _ep->name == ep0name)
634 return -EINVAL;
635 dum = ep_to_dummy(ep);
636
637 spin_lock_irqsave(&dum->lock, flags);
638 ep->desc = NULL;
639 ep->stream_en = 0;
640 nuke(dum, ep);
641 spin_unlock_irqrestore(&dum->lock, flags);
642
643 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
644 return 0;
645 }
646
647 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
648 gfp_t mem_flags)
649 {
650 struct dummy_ep *ep;
651 struct dummy_request *req;
652
653 if (!_ep)
654 return NULL;
655 ep = usb_ep_to_dummy_ep(_ep);
656
657 req = kzalloc(sizeof(*req), mem_flags);
658 if (!req)
659 return NULL;
660 INIT_LIST_HEAD(&req->queue);
661 return &req->req;
662 }
663
664 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
665 {
666 struct dummy_request *req;
667
668 if (!_ep || !_req) {
669 WARN_ON(1);
670 return;
671 }
672
673 req = usb_request_to_dummy_request(_req);
674 WARN_ON(!list_empty(&req->queue));
675 kfree(req);
676 }
677
678 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
679 {
680 }
681
682 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
683 gfp_t mem_flags)
684 {
685 struct dummy_ep *ep;
686 struct dummy_request *req;
687 struct dummy *dum;
688 struct dummy_hcd *dum_hcd;
689 unsigned long flags;
690
691 req = usb_request_to_dummy_request(_req);
692 if (!_req || !list_empty(&req->queue) || !_req->complete)
693 return -EINVAL;
694
695 ep = usb_ep_to_dummy_ep(_ep);
696 if (!_ep || (!ep->desc && _ep->name != ep0name))
697 return -EINVAL;
698
699 dum = ep_to_dummy(ep);
700 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
701 if (!dum->driver || !is_enabled(dum_hcd))
702 return -ESHUTDOWN;
703
704 #if 0
705 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
706 ep, _req, _ep->name, _req->length, _req->buf);
707 #endif
708 _req->status = -EINPROGRESS;
709 _req->actual = 0;
710 spin_lock_irqsave(&dum->lock, flags);
711
712 /* implement an emulated single-request FIFO */
713 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
714 list_empty(&dum->fifo_req.queue) &&
715 list_empty(&ep->queue) &&
716 _req->length <= FIFO_SIZE) {
717 req = &dum->fifo_req;
718 req->req = *_req;
719 req->req.buf = dum->fifo_buf;
720 memcpy(dum->fifo_buf, _req->buf, _req->length);
721 req->req.context = dum;
722 req->req.complete = fifo_complete;
723
724 list_add_tail(&req->queue, &ep->queue);
725 spin_unlock(&dum->lock);
726 _req->actual = _req->length;
727 _req->status = 0;
728 usb_gadget_giveback_request(_ep, _req);
729 spin_lock(&dum->lock);
730 } else
731 list_add_tail(&req->queue, &ep->queue);
732 spin_unlock_irqrestore(&dum->lock, flags);
733
734 /* real hardware would likely enable transfers here, in case
735 * it'd been left NAKing.
736 */
737 return 0;
738 }
739
740 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
741 {
742 struct dummy_ep *ep;
743 struct dummy *dum;
744 int retval = -EINVAL;
745 unsigned long flags;
746 struct dummy_request *req = NULL;
747
748 if (!_ep || !_req)
749 return retval;
750 ep = usb_ep_to_dummy_ep(_ep);
751 dum = ep_to_dummy(ep);
752
753 if (!dum->driver)
754 return -ESHUTDOWN;
755
756 local_irq_save(flags);
757 spin_lock(&dum->lock);
758 list_for_each_entry(req, &ep->queue, queue) {
759 if (&req->req == _req) {
760 list_del_init(&req->queue);
761 _req->status = -ECONNRESET;
762 retval = 0;
763 break;
764 }
765 }
766 spin_unlock(&dum->lock);
767
768 if (retval == 0) {
769 dev_dbg(udc_dev(dum),
770 "dequeued req %p from %s, len %d buf %p\n",
771 req, _ep->name, _req->length, _req->buf);
772 usb_gadget_giveback_request(_ep, _req);
773 }
774 local_irq_restore(flags);
775 return retval;
776 }
777
778 static int
779 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
780 {
781 struct dummy_ep *ep;
782 struct dummy *dum;
783
784 if (!_ep)
785 return -EINVAL;
786 ep = usb_ep_to_dummy_ep(_ep);
787 dum = ep_to_dummy(ep);
788 if (!dum->driver)
789 return -ESHUTDOWN;
790 if (!value)
791 ep->halted = ep->wedged = 0;
792 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
793 !list_empty(&ep->queue))
794 return -EAGAIN;
795 else {
796 ep->halted = 1;
797 if (wedged)
798 ep->wedged = 1;
799 }
800 /* FIXME clear emulated data toggle too */
801 return 0;
802 }
803
804 static int
805 dummy_set_halt(struct usb_ep *_ep, int value)
806 {
807 return dummy_set_halt_and_wedge(_ep, value, 0);
808 }
809
810 static int dummy_set_wedge(struct usb_ep *_ep)
811 {
812 if (!_ep || _ep->name == ep0name)
813 return -EINVAL;
814 return dummy_set_halt_and_wedge(_ep, 1, 1);
815 }
816
817 static const struct usb_ep_ops dummy_ep_ops = {
818 .enable = dummy_enable,
819 .disable = dummy_disable,
820
821 .alloc_request = dummy_alloc_request,
822 .free_request = dummy_free_request,
823
824 .queue = dummy_queue,
825 .dequeue = dummy_dequeue,
826
827 .set_halt = dummy_set_halt,
828 .set_wedge = dummy_set_wedge,
829 };
830
831 /*-------------------------------------------------------------------------*/
832
833 /* there are both host and device side versions of this call ... */
834 static int dummy_g_get_frame(struct usb_gadget *_gadget)
835 {
836 struct timeval tv;
837
838 do_gettimeofday(&tv);
839 return tv.tv_usec / 1000;
840 }
841
842 static int dummy_wakeup(struct usb_gadget *_gadget)
843 {
844 struct dummy_hcd *dum_hcd;
845
846 dum_hcd = gadget_to_dummy_hcd(_gadget);
847 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
848 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
849 return -EINVAL;
850 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
851 return -ENOLINK;
852 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
853 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
854 return -EIO;
855
856 /* FIXME: What if the root hub is suspended but the port isn't? */
857
858 /* hub notices our request, issues downstream resume, etc */
859 dum_hcd->resuming = 1;
860 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
861 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
862 return 0;
863 }
864
865 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
866 {
867 struct dummy *dum;
868
869 _gadget->is_selfpowered = (value != 0);
870 dum = gadget_to_dummy_hcd(_gadget)->dum;
871 if (value)
872 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
873 else
874 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
875 return 0;
876 }
877
878 static void dummy_udc_update_ep0(struct dummy *dum)
879 {
880 if (dum->gadget.speed == USB_SPEED_SUPER)
881 dum->ep[0].ep.maxpacket = 9;
882 else
883 dum->ep[0].ep.maxpacket = 64;
884 }
885
886 static int dummy_pullup(struct usb_gadget *_gadget, int value)
887 {
888 struct dummy_hcd *dum_hcd;
889 struct dummy *dum;
890 unsigned long flags;
891
892 dum = gadget_dev_to_dummy(&_gadget->dev);
893
894 if (value && dum->driver) {
895 if (mod_data.is_super_speed)
896 dum->gadget.speed = dum->driver->max_speed;
897 else if (mod_data.is_high_speed)
898 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
899 dum->driver->max_speed);
900 else
901 dum->gadget.speed = USB_SPEED_FULL;
902 dummy_udc_update_ep0(dum);
903
904 if (dum->gadget.speed < dum->driver->max_speed)
905 dev_dbg(udc_dev(dum), "This device can perform faster"
906 " if you connect it to a %s port...\n",
907 usb_speed_string(dum->driver->max_speed));
908 }
909 dum_hcd = gadget_to_dummy_hcd(_gadget);
910
911 spin_lock_irqsave(&dum->lock, flags);
912 dum->pullup = (value != 0);
913 set_link_state(dum_hcd);
914 spin_unlock_irqrestore(&dum->lock, flags);
915
916 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
917 return 0;
918 }
919
920 static int dummy_udc_start(struct usb_gadget *g,
921 struct usb_gadget_driver *driver);
922 static int dummy_udc_stop(struct usb_gadget *g);
923
924 static const struct usb_gadget_ops dummy_ops = {
925 .get_frame = dummy_g_get_frame,
926 .wakeup = dummy_wakeup,
927 .set_selfpowered = dummy_set_selfpowered,
928 .pullup = dummy_pullup,
929 .udc_start = dummy_udc_start,
930 .udc_stop = dummy_udc_stop,
931 };
932
933 /*-------------------------------------------------------------------------*/
934
935 /* "function" sysfs attribute */
936 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
937 char *buf)
938 {
939 struct dummy *dum = gadget_dev_to_dummy(dev);
940
941 if (!dum->driver || !dum->driver->function)
942 return 0;
943 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
944 }
945 static DEVICE_ATTR_RO(function);
946
947 /*-------------------------------------------------------------------------*/
948
949 /*
950 * Driver registration/unregistration.
951 *
952 * This is basically hardware-specific; there's usually only one real USB
953 * device (not host) controller since that's how USB devices are intended
954 * to work. So most implementations of these api calls will rely on the
955 * fact that only one driver will ever bind to the hardware. But curious
956 * hardware can be built with discrete components, so the gadget API doesn't
957 * require that assumption.
958 *
959 * For this emulator, it might be convenient to create a usb slave device
960 * for each driver that registers: just add to a big root hub.
961 */
962
963 static int dummy_udc_start(struct usb_gadget *g,
964 struct usb_gadget_driver *driver)
965 {
966 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
967 struct dummy *dum = dum_hcd->dum;
968
969 if (driver->max_speed == USB_SPEED_UNKNOWN)
970 return -EINVAL;
971
972 /*
973 * SLAVE side init ... the layer above hardware, which
974 * can't enumerate without help from the driver we're binding.
975 */
976
977 dum->devstatus = 0;
978 dum->driver = driver;
979
980 return 0;
981 }
982
983 static int dummy_udc_stop(struct usb_gadget *g)
984 {
985 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
986 struct dummy *dum = dum_hcd->dum;
987
988 dum->driver = NULL;
989
990 return 0;
991 }
992
993 #undef is_enabled
994
995 /* The gadget structure is stored inside the hcd structure and will be
996 * released along with it. */
997 static void init_dummy_udc_hw(struct dummy *dum)
998 {
999 int i;
1000
1001 INIT_LIST_HEAD(&dum->gadget.ep_list);
1002 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1003 struct dummy_ep *ep = &dum->ep[i];
1004
1005 if (!ep_info[i].name)
1006 break;
1007 ep->ep.name = ep_info[i].name;
1008 ep->ep.caps = ep_info[i].caps;
1009 ep->ep.ops = &dummy_ep_ops;
1010 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1011 ep->halted = ep->wedged = ep->already_seen =
1012 ep->setup_stage = 0;
1013 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1014 ep->ep.max_streams = 16;
1015 ep->last_io = jiffies;
1016 ep->gadget = &dum->gadget;
1017 ep->desc = NULL;
1018 INIT_LIST_HEAD(&ep->queue);
1019 }
1020
1021 dum->gadget.ep0 = &dum->ep[0].ep;
1022 list_del_init(&dum->ep[0].ep.ep_list);
1023 INIT_LIST_HEAD(&dum->fifo_req.queue);
1024
1025 #ifdef CONFIG_USB_OTG
1026 dum->gadget.is_otg = 1;
1027 #endif
1028 }
1029
1030 static int dummy_udc_probe(struct platform_device *pdev)
1031 {
1032 struct dummy *dum;
1033 int rc;
1034
1035 dum = *((void **)dev_get_platdata(&pdev->dev));
1036 dum->gadget.name = gadget_name;
1037 dum->gadget.ops = &dummy_ops;
1038 dum->gadget.max_speed = USB_SPEED_SUPER;
1039
1040 dum->gadget.dev.parent = &pdev->dev;
1041 init_dummy_udc_hw(dum);
1042
1043 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1044 if (rc < 0)
1045 goto err_udc;
1046
1047 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1048 if (rc < 0)
1049 goto err_dev;
1050 platform_set_drvdata(pdev, dum);
1051 return rc;
1052
1053 err_dev:
1054 usb_del_gadget_udc(&dum->gadget);
1055 err_udc:
1056 return rc;
1057 }
1058
1059 static int dummy_udc_remove(struct platform_device *pdev)
1060 {
1061 struct dummy *dum = platform_get_drvdata(pdev);
1062
1063 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1064 usb_del_gadget_udc(&dum->gadget);
1065 return 0;
1066 }
1067
1068 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1069 int suspend)
1070 {
1071 spin_lock_irq(&dum->lock);
1072 dum->udc_suspended = suspend;
1073 set_link_state(dum_hcd);
1074 spin_unlock_irq(&dum->lock);
1075 }
1076
1077 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1078 {
1079 struct dummy *dum = platform_get_drvdata(pdev);
1080 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1081
1082 dev_dbg(&pdev->dev, "%s\n", __func__);
1083 dummy_udc_pm(dum, dum_hcd, 1);
1084 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1085 return 0;
1086 }
1087
1088 static int dummy_udc_resume(struct platform_device *pdev)
1089 {
1090 struct dummy *dum = platform_get_drvdata(pdev);
1091 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1092
1093 dev_dbg(&pdev->dev, "%s\n", __func__);
1094 dummy_udc_pm(dum, dum_hcd, 0);
1095 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1096 return 0;
1097 }
1098
1099 static struct platform_driver dummy_udc_driver = {
1100 .probe = dummy_udc_probe,
1101 .remove = dummy_udc_remove,
1102 .suspend = dummy_udc_suspend,
1103 .resume = dummy_udc_resume,
1104 .driver = {
1105 .name = (char *) gadget_name,
1106 },
1107 };
1108
1109 /*-------------------------------------------------------------------------*/
1110
1111 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1112 {
1113 unsigned int index;
1114
1115 index = usb_endpoint_num(desc) << 1;
1116 if (usb_endpoint_dir_in(desc))
1117 index |= 1;
1118 return index;
1119 }
1120
1121 /* MASTER/HOST SIDE DRIVER
1122 *
1123 * this uses the hcd framework to hook up to host side drivers.
1124 * its root hub will only have one device, otherwise it acts like
1125 * a normal host controller.
1126 *
1127 * when urbs are queued, they're just stuck on a list that we
1128 * scan in a timer callback. that callback connects writes from
1129 * the host with reads from the device, and so on, based on the
1130 * usb 2.0 rules.
1131 */
1132
1133 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1134 {
1135 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1136 u32 index;
1137
1138 if (!usb_endpoint_xfer_bulk(desc))
1139 return 0;
1140
1141 index = dummy_get_ep_idx(desc);
1142 return (1 << index) & dum_hcd->stream_en_ep;
1143 }
1144
1145 /*
1146 * The max stream number is saved as a nibble so for the 30 possible endpoints
1147 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1148 * means we use only 1 stream). The maximum according to the spec is 16bit so
1149 * if the 16 stream limit is about to go, the array size should be incremented
1150 * to 30 elements of type u16.
1151 */
1152 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1153 unsigned int pipe)
1154 {
1155 int max_streams;
1156
1157 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1158 if (usb_pipeout(pipe))
1159 max_streams >>= 4;
1160 else
1161 max_streams &= 0xf;
1162 max_streams++;
1163 return max_streams;
1164 }
1165
1166 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1167 unsigned int pipe, unsigned int streams)
1168 {
1169 int max_streams;
1170
1171 streams--;
1172 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1173 if (usb_pipeout(pipe)) {
1174 streams <<= 4;
1175 max_streams &= 0xf;
1176 } else {
1177 max_streams &= 0xf0;
1178 }
1179 max_streams |= streams;
1180 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1181 }
1182
1183 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1184 {
1185 unsigned int max_streams;
1186 int enabled;
1187
1188 enabled = dummy_ep_stream_en(dum_hcd, urb);
1189 if (!urb->stream_id) {
1190 if (enabled)
1191 return -EINVAL;
1192 return 0;
1193 }
1194 if (!enabled)
1195 return -EINVAL;
1196
1197 max_streams = get_max_streams_for_pipe(dum_hcd,
1198 usb_pipeendpoint(urb->pipe));
1199 if (urb->stream_id > max_streams) {
1200 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1201 urb->stream_id);
1202 BUG();
1203 return -EINVAL;
1204 }
1205 return 0;
1206 }
1207
1208 static int dummy_urb_enqueue(
1209 struct usb_hcd *hcd,
1210 struct urb *urb,
1211 gfp_t mem_flags
1212 ) {
1213 struct dummy_hcd *dum_hcd;
1214 struct urbp *urbp;
1215 unsigned long flags;
1216 int rc;
1217
1218 urbp = kmalloc(sizeof *urbp, mem_flags);
1219 if (!urbp)
1220 return -ENOMEM;
1221 urbp->urb = urb;
1222 urbp->miter_started = 0;
1223
1224 dum_hcd = hcd_to_dummy_hcd(hcd);
1225 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1226
1227 rc = dummy_validate_stream(dum_hcd, urb);
1228 if (rc) {
1229 kfree(urbp);
1230 goto done;
1231 }
1232
1233 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1234 if (rc) {
1235 kfree(urbp);
1236 goto done;
1237 }
1238
1239 if (!dum_hcd->udev) {
1240 dum_hcd->udev = urb->dev;
1241 usb_get_dev(dum_hcd->udev);
1242 } else if (unlikely(dum_hcd->udev != urb->dev))
1243 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1244
1245 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1246 urb->hcpriv = urbp;
1247 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1248 urb->error_count = 1; /* mark as a new urb */
1249
1250 /* kick the scheduler, it'll do the rest */
1251 if (!timer_pending(&dum_hcd->timer))
1252 mod_timer(&dum_hcd->timer, jiffies + 1);
1253
1254 done:
1255 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1256 return rc;
1257 }
1258
1259 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1260 {
1261 struct dummy_hcd *dum_hcd;
1262 unsigned long flags;
1263 int rc;
1264
1265 /* giveback happens automatically in timer callback,
1266 * so make sure the callback happens */
1267 dum_hcd = hcd_to_dummy_hcd(hcd);
1268 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1269
1270 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1271 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1272 !list_empty(&dum_hcd->urbp_list))
1273 mod_timer(&dum_hcd->timer, jiffies);
1274
1275 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1276 return rc;
1277 }
1278
1279 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1280 u32 len)
1281 {
1282 void *ubuf, *rbuf;
1283 struct urbp *urbp = urb->hcpriv;
1284 int to_host;
1285 struct sg_mapping_iter *miter = &urbp->miter;
1286 u32 trans = 0;
1287 u32 this_sg;
1288 bool next_sg;
1289
1290 to_host = usb_pipein(urb->pipe);
1291 rbuf = req->req.buf + req->req.actual;
1292
1293 if (!urb->num_sgs) {
1294 ubuf = urb->transfer_buffer + urb->actual_length;
1295 if (to_host)
1296 memcpy(ubuf, rbuf, len);
1297 else
1298 memcpy(rbuf, ubuf, len);
1299 return len;
1300 }
1301
1302 if (!urbp->miter_started) {
1303 u32 flags = SG_MITER_ATOMIC;
1304
1305 if (to_host)
1306 flags |= SG_MITER_TO_SG;
1307 else
1308 flags |= SG_MITER_FROM_SG;
1309
1310 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1311 urbp->miter_started = 1;
1312 }
1313 next_sg = sg_miter_next(miter);
1314 if (next_sg == false) {
1315 WARN_ON_ONCE(1);
1316 return -EINVAL;
1317 }
1318 do {
1319 ubuf = miter->addr;
1320 this_sg = min_t(u32, len, miter->length);
1321 miter->consumed = this_sg;
1322 trans += this_sg;
1323
1324 if (to_host)
1325 memcpy(ubuf, rbuf, this_sg);
1326 else
1327 memcpy(rbuf, ubuf, this_sg);
1328 len -= this_sg;
1329
1330 if (!len)
1331 break;
1332 next_sg = sg_miter_next(miter);
1333 if (next_sg == false) {
1334 WARN_ON_ONCE(1);
1335 return -EINVAL;
1336 }
1337
1338 rbuf += this_sg;
1339 } while (1);
1340
1341 sg_miter_stop(miter);
1342 return trans;
1343 }
1344
1345 /* transfer up to a frame's worth; caller must own lock */
1346 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1347 struct dummy_ep *ep, int limit, int *status)
1348 {
1349 struct dummy *dum = dum_hcd->dum;
1350 struct dummy_request *req;
1351 int sent = 0;
1352
1353 top:
1354 /* if there's no request queued, the device is NAKing; return */
1355 list_for_each_entry(req, &ep->queue, queue) {
1356 unsigned host_len, dev_len, len;
1357 int is_short, to_host;
1358 int rescan = 0;
1359
1360 if (dummy_ep_stream_en(dum_hcd, urb)) {
1361 if ((urb->stream_id != req->req.stream_id))
1362 continue;
1363 }
1364
1365 /* 1..N packets of ep->ep.maxpacket each ... the last one
1366 * may be short (including zero length).
1367 *
1368 * writer can send a zlp explicitly (length 0) or implicitly
1369 * (length mod maxpacket zero, and 'zero' flag); they always
1370 * terminate reads.
1371 */
1372 host_len = urb->transfer_buffer_length - urb->actual_length;
1373 dev_len = req->req.length - req->req.actual;
1374 len = min(host_len, dev_len);
1375
1376 /* FIXME update emulated data toggle too */
1377
1378 to_host = usb_pipein(urb->pipe);
1379 if (unlikely(len == 0))
1380 is_short = 1;
1381 else {
1382 /* not enough bandwidth left? */
1383 if (limit < ep->ep.maxpacket && limit < len)
1384 break;
1385 len = min_t(unsigned, len, limit);
1386 if (len == 0)
1387 break;
1388
1389 /* send multiple of maxpacket first, then remainder */
1390 if (len >= ep->ep.maxpacket) {
1391 is_short = 0;
1392 if (len % ep->ep.maxpacket)
1393 rescan = 1;
1394 len -= len % ep->ep.maxpacket;
1395 } else {
1396 is_short = 1;
1397 }
1398
1399 len = dummy_perform_transfer(urb, req, len);
1400
1401 ep->last_io = jiffies;
1402 if ((int)len < 0) {
1403 req->req.status = len;
1404 } else {
1405 limit -= len;
1406 sent += len;
1407 urb->actual_length += len;
1408 req->req.actual += len;
1409 }
1410 }
1411
1412 /* short packets terminate, maybe with overflow/underflow.
1413 * it's only really an error to write too much.
1414 *
1415 * partially filling a buffer optionally blocks queue advances
1416 * (so completion handlers can clean up the queue) but we don't
1417 * need to emulate such data-in-flight.
1418 */
1419 if (is_short) {
1420 if (host_len == dev_len) {
1421 req->req.status = 0;
1422 *status = 0;
1423 } else if (to_host) {
1424 req->req.status = 0;
1425 if (dev_len > host_len)
1426 *status = -EOVERFLOW;
1427 else
1428 *status = 0;
1429 } else {
1430 *status = 0;
1431 if (host_len > dev_len)
1432 req->req.status = -EOVERFLOW;
1433 else
1434 req->req.status = 0;
1435 }
1436
1437 /*
1438 * many requests terminate without a short packet.
1439 * send a zlp if demanded by flags.
1440 */
1441 } else {
1442 if (req->req.length == req->req.actual) {
1443 if (req->req.zero && to_host)
1444 rescan = 1;
1445 else
1446 req->req.status = 0;
1447 }
1448 if (urb->transfer_buffer_length == urb->actual_length) {
1449 if (urb->transfer_flags & URB_ZERO_PACKET &&
1450 !to_host)
1451 rescan = 1;
1452 else
1453 *status = 0;
1454 }
1455 }
1456
1457 /* device side completion --> continuable */
1458 if (req->req.status != -EINPROGRESS) {
1459 list_del_init(&req->queue);
1460
1461 spin_unlock(&dum->lock);
1462 usb_gadget_giveback_request(&ep->ep, &req->req);
1463 spin_lock(&dum->lock);
1464
1465 /* requests might have been unlinked... */
1466 rescan = 1;
1467 }
1468
1469 /* host side completion --> terminate */
1470 if (*status != -EINPROGRESS)
1471 break;
1472
1473 /* rescan to continue with any other queued i/o */
1474 if (rescan)
1475 goto top;
1476 }
1477 return sent;
1478 }
1479
1480 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1481 {
1482 int limit = ep->ep.maxpacket;
1483
1484 if (dum->gadget.speed == USB_SPEED_HIGH) {
1485 int tmp;
1486
1487 /* high bandwidth mode */
1488 tmp = usb_endpoint_maxp(ep->desc);
1489 tmp = (tmp >> 11) & 0x03;
1490 tmp *= 8 /* applies to entire frame */;
1491 limit += limit * tmp;
1492 }
1493 if (dum->gadget.speed == USB_SPEED_SUPER) {
1494 switch (usb_endpoint_type(ep->desc)) {
1495 case USB_ENDPOINT_XFER_ISOC:
1496 /* Sec. 4.4.8.2 USB3.0 Spec */
1497 limit = 3 * 16 * 1024 * 8;
1498 break;
1499 case USB_ENDPOINT_XFER_INT:
1500 /* Sec. 4.4.7.2 USB3.0 Spec */
1501 limit = 3 * 1024 * 8;
1502 break;
1503 case USB_ENDPOINT_XFER_BULK:
1504 default:
1505 break;
1506 }
1507 }
1508 return limit;
1509 }
1510
1511 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1512 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1513 USB_PORT_STAT_SUSPEND)) \
1514 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1515
1516 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1517 {
1518 int i;
1519
1520 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1521 dum->ss_hcd : dum->hs_hcd)))
1522 return NULL;
1523 if ((address & ~USB_DIR_IN) == 0)
1524 return &dum->ep[0];
1525 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1526 struct dummy_ep *ep = &dum->ep[i];
1527
1528 if (!ep->desc)
1529 continue;
1530 if (ep->desc->bEndpointAddress == address)
1531 return ep;
1532 }
1533 return NULL;
1534 }
1535
1536 #undef is_active
1537
1538 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1539 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1540 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1541 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1542 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1543 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1544
1545
1546 /**
1547 * handle_control_request() - handles all control transfers
1548 * @dum: pointer to dummy (the_controller)
1549 * @urb: the urb request to handle
1550 * @setup: pointer to the setup data for a USB device control
1551 * request
1552 * @status: pointer to request handling status
1553 *
1554 * Return 0 - if the request was handled
1555 * 1 - if the request wasn't handles
1556 * error code on error
1557 */
1558 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1559 struct usb_ctrlrequest *setup,
1560 int *status)
1561 {
1562 struct dummy_ep *ep2;
1563 struct dummy *dum = dum_hcd->dum;
1564 int ret_val = 1;
1565 unsigned w_index;
1566 unsigned w_value;
1567
1568 w_index = le16_to_cpu(setup->wIndex);
1569 w_value = le16_to_cpu(setup->wValue);
1570 switch (setup->bRequest) {
1571 case USB_REQ_SET_ADDRESS:
1572 if (setup->bRequestType != Dev_Request)
1573 break;
1574 dum->address = w_value;
1575 *status = 0;
1576 dev_dbg(udc_dev(dum), "set_address = %d\n",
1577 w_value);
1578 ret_val = 0;
1579 break;
1580 case USB_REQ_SET_FEATURE:
1581 if (setup->bRequestType == Dev_Request) {
1582 ret_val = 0;
1583 switch (w_value) {
1584 case USB_DEVICE_REMOTE_WAKEUP:
1585 break;
1586 case USB_DEVICE_B_HNP_ENABLE:
1587 dum->gadget.b_hnp_enable = 1;
1588 break;
1589 case USB_DEVICE_A_HNP_SUPPORT:
1590 dum->gadget.a_hnp_support = 1;
1591 break;
1592 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1593 dum->gadget.a_alt_hnp_support = 1;
1594 break;
1595 case USB_DEVICE_U1_ENABLE:
1596 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1597 HCD_USB3)
1598 w_value = USB_DEV_STAT_U1_ENABLED;
1599 else
1600 ret_val = -EOPNOTSUPP;
1601 break;
1602 case USB_DEVICE_U2_ENABLE:
1603 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1604 HCD_USB3)
1605 w_value = USB_DEV_STAT_U2_ENABLED;
1606 else
1607 ret_val = -EOPNOTSUPP;
1608 break;
1609 case USB_DEVICE_LTM_ENABLE:
1610 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1611 HCD_USB3)
1612 w_value = USB_DEV_STAT_LTM_ENABLED;
1613 else
1614 ret_val = -EOPNOTSUPP;
1615 break;
1616 default:
1617 ret_val = -EOPNOTSUPP;
1618 }
1619 if (ret_val == 0) {
1620 dum->devstatus |= (1 << w_value);
1621 *status = 0;
1622 }
1623 } else if (setup->bRequestType == Ep_Request) {
1624 /* endpoint halt */
1625 ep2 = find_endpoint(dum, w_index);
1626 if (!ep2 || ep2->ep.name == ep0name) {
1627 ret_val = -EOPNOTSUPP;
1628 break;
1629 }
1630 ep2->halted = 1;
1631 ret_val = 0;
1632 *status = 0;
1633 }
1634 break;
1635 case USB_REQ_CLEAR_FEATURE:
1636 if (setup->bRequestType == Dev_Request) {
1637 ret_val = 0;
1638 switch (w_value) {
1639 case USB_DEVICE_REMOTE_WAKEUP:
1640 w_value = USB_DEVICE_REMOTE_WAKEUP;
1641 break;
1642 case USB_DEVICE_U1_ENABLE:
1643 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1644 HCD_USB3)
1645 w_value = USB_DEV_STAT_U1_ENABLED;
1646 else
1647 ret_val = -EOPNOTSUPP;
1648 break;
1649 case USB_DEVICE_U2_ENABLE:
1650 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1651 HCD_USB3)
1652 w_value = USB_DEV_STAT_U2_ENABLED;
1653 else
1654 ret_val = -EOPNOTSUPP;
1655 break;
1656 case USB_DEVICE_LTM_ENABLE:
1657 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1658 HCD_USB3)
1659 w_value = USB_DEV_STAT_LTM_ENABLED;
1660 else
1661 ret_val = -EOPNOTSUPP;
1662 break;
1663 default:
1664 ret_val = -EOPNOTSUPP;
1665 break;
1666 }
1667 if (ret_val == 0) {
1668 dum->devstatus &= ~(1 << w_value);
1669 *status = 0;
1670 }
1671 } else if (setup->bRequestType == Ep_Request) {
1672 /* endpoint halt */
1673 ep2 = find_endpoint(dum, w_index);
1674 if (!ep2) {
1675 ret_val = -EOPNOTSUPP;
1676 break;
1677 }
1678 if (!ep2->wedged)
1679 ep2->halted = 0;
1680 ret_val = 0;
1681 *status = 0;
1682 }
1683 break;
1684 case USB_REQ_GET_STATUS:
1685 if (setup->bRequestType == Dev_InRequest
1686 || setup->bRequestType == Intf_InRequest
1687 || setup->bRequestType == Ep_InRequest) {
1688 char *buf;
1689 /*
1690 * device: remote wakeup, selfpowered
1691 * interface: nothing
1692 * endpoint: halt
1693 */
1694 buf = (char *)urb->transfer_buffer;
1695 if (urb->transfer_buffer_length > 0) {
1696 if (setup->bRequestType == Ep_InRequest) {
1697 ep2 = find_endpoint(dum, w_index);
1698 if (!ep2) {
1699 ret_val = -EOPNOTSUPP;
1700 break;
1701 }
1702 buf[0] = ep2->halted;
1703 } else if (setup->bRequestType ==
1704 Dev_InRequest) {
1705 buf[0] = (u8)dum->devstatus;
1706 } else
1707 buf[0] = 0;
1708 }
1709 if (urb->transfer_buffer_length > 1)
1710 buf[1] = 0;
1711 urb->actual_length = min_t(u32, 2,
1712 urb->transfer_buffer_length);
1713 ret_val = 0;
1714 *status = 0;
1715 }
1716 break;
1717 }
1718 return ret_val;
1719 }
1720
1721 /* drive both sides of the transfers; looks like irq handlers to
1722 * both drivers except the callbacks aren't in_irq().
1723 */
1724 static void dummy_timer(unsigned long _dum_hcd)
1725 {
1726 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1727 struct dummy *dum = dum_hcd->dum;
1728 struct urbp *urbp, *tmp;
1729 unsigned long flags;
1730 int limit, total;
1731 int i;
1732
1733 /* simplistic model for one frame's bandwidth */
1734 switch (dum->gadget.speed) {
1735 case USB_SPEED_LOW:
1736 total = 8/*bytes*/ * 12/*packets*/;
1737 break;
1738 case USB_SPEED_FULL:
1739 total = 64/*bytes*/ * 19/*packets*/;
1740 break;
1741 case USB_SPEED_HIGH:
1742 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1743 break;
1744 case USB_SPEED_SUPER:
1745 /* Bus speed is 500000 bytes/ms, so use a little less */
1746 total = 490000;
1747 break;
1748 default:
1749 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1750 return;
1751 }
1752
1753 /* FIXME if HZ != 1000 this will probably misbehave ... */
1754
1755 /* look at each urb queued by the host side driver */
1756 spin_lock_irqsave(&dum->lock, flags);
1757
1758 if (!dum_hcd->udev) {
1759 dev_err(dummy_dev(dum_hcd),
1760 "timer fired with no URBs pending?\n");
1761 spin_unlock_irqrestore(&dum->lock, flags);
1762 return;
1763 }
1764
1765 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1766 if (!ep_info[i].name)
1767 break;
1768 dum->ep[i].already_seen = 0;
1769 }
1770
1771 restart:
1772 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1773 struct urb *urb;
1774 struct dummy_request *req;
1775 u8 address;
1776 struct dummy_ep *ep = NULL;
1777 int type;
1778 int status = -EINPROGRESS;
1779
1780 urb = urbp->urb;
1781 if (urb->unlinked)
1782 goto return_urb;
1783 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1784 continue;
1785 type = usb_pipetype(urb->pipe);
1786
1787 /* used up this frame's non-periodic bandwidth?
1788 * FIXME there's infinite bandwidth for control and
1789 * periodic transfers ... unrealistic.
1790 */
1791 if (total <= 0 && type == PIPE_BULK)
1792 continue;
1793
1794 /* find the gadget's ep for this request (if configured) */
1795 address = usb_pipeendpoint (urb->pipe);
1796 if (usb_pipein(urb->pipe))
1797 address |= USB_DIR_IN;
1798 ep = find_endpoint(dum, address);
1799 if (!ep) {
1800 /* set_configuration() disagreement */
1801 dev_dbg(dummy_dev(dum_hcd),
1802 "no ep configured for urb %p\n",
1803 urb);
1804 status = -EPROTO;
1805 goto return_urb;
1806 }
1807
1808 if (ep->already_seen)
1809 continue;
1810 ep->already_seen = 1;
1811 if (ep == &dum->ep[0] && urb->error_count) {
1812 ep->setup_stage = 1; /* a new urb */
1813 urb->error_count = 0;
1814 }
1815 if (ep->halted && !ep->setup_stage) {
1816 /* NOTE: must not be iso! */
1817 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1818 ep->ep.name, urb);
1819 status = -EPIPE;
1820 goto return_urb;
1821 }
1822 /* FIXME make sure both ends agree on maxpacket */
1823
1824 /* handle control requests */
1825 if (ep == &dum->ep[0] && ep->setup_stage) {
1826 struct usb_ctrlrequest setup;
1827 int value = 1;
1828
1829 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1830 /* paranoia, in case of stale queued data */
1831 list_for_each_entry(req, &ep->queue, queue) {
1832 list_del_init(&req->queue);
1833 req->req.status = -EOVERFLOW;
1834 dev_dbg(udc_dev(dum), "stale req = %p\n",
1835 req);
1836
1837 spin_unlock(&dum->lock);
1838 usb_gadget_giveback_request(&ep->ep, &req->req);
1839 spin_lock(&dum->lock);
1840 ep->already_seen = 0;
1841 goto restart;
1842 }
1843
1844 /* gadget driver never sees set_address or operations
1845 * on standard feature flags. some hardware doesn't
1846 * even expose them.
1847 */
1848 ep->last_io = jiffies;
1849 ep->setup_stage = 0;
1850 ep->halted = 0;
1851
1852 value = handle_control_request(dum_hcd, urb, &setup,
1853 &status);
1854
1855 /* gadget driver handles all other requests. block
1856 * until setup() returns; no reentrancy issues etc.
1857 */
1858 if (value > 0) {
1859 spin_unlock(&dum->lock);
1860 value = dum->driver->setup(&dum->gadget,
1861 &setup);
1862 spin_lock(&dum->lock);
1863
1864 if (value >= 0) {
1865 /* no delays (max 64KB data stage) */
1866 limit = 64*1024;
1867 goto treat_control_like_bulk;
1868 }
1869 /* error, see below */
1870 }
1871
1872 if (value < 0) {
1873 if (value != -EOPNOTSUPP)
1874 dev_dbg(udc_dev(dum),
1875 "setup --> %d\n",
1876 value);
1877 status = -EPIPE;
1878 urb->actual_length = 0;
1879 }
1880
1881 goto return_urb;
1882 }
1883
1884 /* non-control requests */
1885 limit = total;
1886 switch (usb_pipetype(urb->pipe)) {
1887 case PIPE_ISOCHRONOUS:
1888 /* FIXME is it urb->interval since the last xfer?
1889 * use urb->iso_frame_desc[i].
1890 * complete whether or not ep has requests queued.
1891 * report random errors, to debug drivers.
1892 */
1893 limit = max(limit, periodic_bytes(dum, ep));
1894 status = -ENOSYS;
1895 break;
1896
1897 case PIPE_INTERRUPT:
1898 /* FIXME is it urb->interval since the last xfer?
1899 * this almost certainly polls too fast.
1900 */
1901 limit = max(limit, periodic_bytes(dum, ep));
1902 /* FALLTHROUGH */
1903
1904 default:
1905 treat_control_like_bulk:
1906 ep->last_io = jiffies;
1907 total -= transfer(dum_hcd, urb, ep, limit, &status);
1908 break;
1909 }
1910
1911 /* incomplete transfer? */
1912 if (status == -EINPROGRESS)
1913 continue;
1914
1915 return_urb:
1916 list_del(&urbp->urbp_list);
1917 kfree(urbp);
1918 if (ep)
1919 ep->already_seen = ep->setup_stage = 0;
1920
1921 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1922 spin_unlock(&dum->lock);
1923 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1924 spin_lock(&dum->lock);
1925
1926 goto restart;
1927 }
1928
1929 if (list_empty(&dum_hcd->urbp_list)) {
1930 usb_put_dev(dum_hcd->udev);
1931 dum_hcd->udev = NULL;
1932 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1933 /* want a 1 msec delay here */
1934 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1935 }
1936
1937 spin_unlock_irqrestore(&dum->lock, flags);
1938 }
1939
1940 /*-------------------------------------------------------------------------*/
1941
1942 #define PORT_C_MASK \
1943 ((USB_PORT_STAT_C_CONNECTION \
1944 | USB_PORT_STAT_C_ENABLE \
1945 | USB_PORT_STAT_C_SUSPEND \
1946 | USB_PORT_STAT_C_OVERCURRENT \
1947 | USB_PORT_STAT_C_RESET) << 16)
1948
1949 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1950 {
1951 struct dummy_hcd *dum_hcd;
1952 unsigned long flags;
1953 int retval = 0;
1954
1955 dum_hcd = hcd_to_dummy_hcd(hcd);
1956
1957 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1958 if (!HCD_HW_ACCESSIBLE(hcd))
1959 goto done;
1960
1961 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1962 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1963 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1964 set_link_state(dum_hcd);
1965 }
1966
1967 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1968 *buf = (1 << 1);
1969 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1970 dum_hcd->port_status);
1971 retval = 1;
1972 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1973 usb_hcd_resume_root_hub(hcd);
1974 }
1975 done:
1976 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1977 return retval;
1978 }
1979
1980 /* usb 3.0 root hub device descriptor */
1981 static struct {
1982 struct usb_bos_descriptor bos;
1983 struct usb_ss_cap_descriptor ss_cap;
1984 } __packed usb3_bos_desc = {
1985
1986 .bos = {
1987 .bLength = USB_DT_BOS_SIZE,
1988 .bDescriptorType = USB_DT_BOS,
1989 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
1990 .bNumDeviceCaps = 1,
1991 },
1992 .ss_cap = {
1993 .bLength = USB_DT_USB_SS_CAP_SIZE,
1994 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
1995 .bDevCapabilityType = USB_SS_CAP_TYPE,
1996 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
1997 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
1998 },
1999 };
2000
2001 static inline void
2002 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2003 {
2004 memset(desc, 0, sizeof *desc);
2005 desc->bDescriptorType = USB_DT_SS_HUB;
2006 desc->bDescLength = 12;
2007 desc->wHubCharacteristics = cpu_to_le16(
2008 HUB_CHAR_INDV_PORT_LPSM |
2009 HUB_CHAR_COMMON_OCPM);
2010 desc->bNbrPorts = 1;
2011 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2012 desc->u.ss.DeviceRemovable = 0xffff;
2013 }
2014
2015 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2016 {
2017 memset(desc, 0, sizeof *desc);
2018 desc->bDescriptorType = USB_DT_HUB;
2019 desc->bDescLength = 9;
2020 desc->wHubCharacteristics = cpu_to_le16(
2021 HUB_CHAR_INDV_PORT_LPSM |
2022 HUB_CHAR_COMMON_OCPM);
2023 desc->bNbrPorts = 1;
2024 desc->u.hs.DeviceRemovable[0] = 0xff;
2025 desc->u.hs.DeviceRemovable[1] = 0xff;
2026 }
2027
2028 static int dummy_hub_control(
2029 struct usb_hcd *hcd,
2030 u16 typeReq,
2031 u16 wValue,
2032 u16 wIndex,
2033 char *buf,
2034 u16 wLength
2035 ) {
2036 struct dummy_hcd *dum_hcd;
2037 int retval = 0;
2038 unsigned long flags;
2039
2040 if (!HCD_HW_ACCESSIBLE(hcd))
2041 return -ETIMEDOUT;
2042
2043 dum_hcd = hcd_to_dummy_hcd(hcd);
2044
2045 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2046 switch (typeReq) {
2047 case ClearHubFeature:
2048 break;
2049 case ClearPortFeature:
2050 switch (wValue) {
2051 case USB_PORT_FEAT_SUSPEND:
2052 if (hcd->speed == HCD_USB3) {
2053 dev_dbg(dummy_dev(dum_hcd),
2054 "USB_PORT_FEAT_SUSPEND req not "
2055 "supported for USB 3.0 roothub\n");
2056 goto error;
2057 }
2058 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2059 /* 20msec resume signaling */
2060 dum_hcd->resuming = 1;
2061 dum_hcd->re_timeout = jiffies +
2062 msecs_to_jiffies(20);
2063 }
2064 break;
2065 case USB_PORT_FEAT_POWER:
2066 if (hcd->speed == HCD_USB3) {
2067 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
2068 dev_dbg(dummy_dev(dum_hcd),
2069 "power-off\n");
2070 } else
2071 if (dum_hcd->port_status &
2072 USB_SS_PORT_STAT_POWER)
2073 dev_dbg(dummy_dev(dum_hcd),
2074 "power-off\n");
2075 /* FALLS THROUGH */
2076 default:
2077 dum_hcd->port_status &= ~(1 << wValue);
2078 set_link_state(dum_hcd);
2079 }
2080 break;
2081 case GetHubDescriptor:
2082 if (hcd->speed == HCD_USB3 &&
2083 (wLength < USB_DT_SS_HUB_SIZE ||
2084 wValue != (USB_DT_SS_HUB << 8))) {
2085 dev_dbg(dummy_dev(dum_hcd),
2086 "Wrong hub descriptor type for "
2087 "USB 3.0 roothub.\n");
2088 goto error;
2089 }
2090 if (hcd->speed == HCD_USB3)
2091 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2092 else
2093 hub_descriptor((struct usb_hub_descriptor *) buf);
2094 break;
2095
2096 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2097 if (hcd->speed != HCD_USB3)
2098 goto error;
2099
2100 if ((wValue >> 8) != USB_DT_BOS)
2101 goto error;
2102
2103 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2104 retval = sizeof(usb3_bos_desc);
2105 break;
2106
2107 case GetHubStatus:
2108 *(__le32 *) buf = cpu_to_le32(0);
2109 break;
2110 case GetPortStatus:
2111 if (wIndex != 1)
2112 retval = -EPIPE;
2113
2114 /* whoever resets or resumes must GetPortStatus to
2115 * complete it!!
2116 */
2117 if (dum_hcd->resuming &&
2118 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2119 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2120 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2121 }
2122 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2123 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2124 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2125 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2126 if (dum_hcd->dum->pullup) {
2127 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2128
2129 if (hcd->speed < HCD_USB3) {
2130 switch (dum_hcd->dum->gadget.speed) {
2131 case USB_SPEED_HIGH:
2132 dum_hcd->port_status |=
2133 USB_PORT_STAT_HIGH_SPEED;
2134 break;
2135 case USB_SPEED_LOW:
2136 dum_hcd->dum->gadget.ep0->
2137 maxpacket = 8;
2138 dum_hcd->port_status |=
2139 USB_PORT_STAT_LOW_SPEED;
2140 break;
2141 default:
2142 dum_hcd->dum->gadget.speed =
2143 USB_SPEED_FULL;
2144 break;
2145 }
2146 }
2147 }
2148 }
2149 set_link_state(dum_hcd);
2150 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2151 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2152 break;
2153 case SetHubFeature:
2154 retval = -EPIPE;
2155 break;
2156 case SetPortFeature:
2157 switch (wValue) {
2158 case USB_PORT_FEAT_LINK_STATE:
2159 if (hcd->speed != HCD_USB3) {
2160 dev_dbg(dummy_dev(dum_hcd),
2161 "USB_PORT_FEAT_LINK_STATE req not "
2162 "supported for USB 2.0 roothub\n");
2163 goto error;
2164 }
2165 /*
2166 * Since this is dummy we don't have an actual link so
2167 * there is nothing to do for the SET_LINK_STATE cmd
2168 */
2169 break;
2170 case USB_PORT_FEAT_U1_TIMEOUT:
2171 case USB_PORT_FEAT_U2_TIMEOUT:
2172 /* TODO: add suspend/resume support! */
2173 if (hcd->speed != HCD_USB3) {
2174 dev_dbg(dummy_dev(dum_hcd),
2175 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2176 "supported for USB 2.0 roothub\n");
2177 goto error;
2178 }
2179 break;
2180 case USB_PORT_FEAT_SUSPEND:
2181 /* Applicable only for USB2.0 hub */
2182 if (hcd->speed == HCD_USB3) {
2183 dev_dbg(dummy_dev(dum_hcd),
2184 "USB_PORT_FEAT_SUSPEND req not "
2185 "supported for USB 3.0 roothub\n");
2186 goto error;
2187 }
2188 if (dum_hcd->active) {
2189 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2190
2191 /* HNP would happen here; for now we
2192 * assume b_bus_req is always true.
2193 */
2194 set_link_state(dum_hcd);
2195 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2196 & dum_hcd->dum->devstatus) != 0)
2197 dev_dbg(dummy_dev(dum_hcd),
2198 "no HNP yet!\n");
2199 }
2200 break;
2201 case USB_PORT_FEAT_POWER:
2202 if (hcd->speed == HCD_USB3)
2203 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2204 else
2205 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2206 set_link_state(dum_hcd);
2207 break;
2208 case USB_PORT_FEAT_BH_PORT_RESET:
2209 /* Applicable only for USB3.0 hub */
2210 if (hcd->speed != HCD_USB3) {
2211 dev_dbg(dummy_dev(dum_hcd),
2212 "USB_PORT_FEAT_BH_PORT_RESET req not "
2213 "supported for USB 2.0 roothub\n");
2214 goto error;
2215 }
2216 /* FALLS THROUGH */
2217 case USB_PORT_FEAT_RESET:
2218 /* if it's already enabled, disable */
2219 if (hcd->speed == HCD_USB3) {
2220 dum_hcd->port_status = 0;
2221 dum_hcd->port_status =
2222 (USB_SS_PORT_STAT_POWER |
2223 USB_PORT_STAT_CONNECTION |
2224 USB_PORT_STAT_RESET);
2225 } else
2226 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2227 | USB_PORT_STAT_LOW_SPEED
2228 | USB_PORT_STAT_HIGH_SPEED);
2229 /*
2230 * We want to reset device status. All but the
2231 * Self powered feature
2232 */
2233 dum_hcd->dum->devstatus &=
2234 (1 << USB_DEVICE_SELF_POWERED);
2235 /*
2236 * FIXME USB3.0: what is the correct reset signaling
2237 * interval? Is it still 50msec as for HS?
2238 */
2239 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2240 /* FALLS THROUGH */
2241 default:
2242 if (hcd->speed == HCD_USB3) {
2243 if ((dum_hcd->port_status &
2244 USB_SS_PORT_STAT_POWER) != 0) {
2245 dum_hcd->port_status |= (1 << wValue);
2246 set_link_state(dum_hcd);
2247 }
2248 } else
2249 if ((dum_hcd->port_status &
2250 USB_PORT_STAT_POWER) != 0) {
2251 dum_hcd->port_status |= (1 << wValue);
2252 set_link_state(dum_hcd);
2253 }
2254 }
2255 break;
2256 case GetPortErrorCount:
2257 if (hcd->speed != HCD_USB3) {
2258 dev_dbg(dummy_dev(dum_hcd),
2259 "GetPortErrorCount req not "
2260 "supported for USB 2.0 roothub\n");
2261 goto error;
2262 }
2263 /* We'll always return 0 since this is a dummy hub */
2264 *(__le32 *) buf = cpu_to_le32(0);
2265 break;
2266 case SetHubDepth:
2267 if (hcd->speed != HCD_USB3) {
2268 dev_dbg(dummy_dev(dum_hcd),
2269 "SetHubDepth req not supported for "
2270 "USB 2.0 roothub\n");
2271 goto error;
2272 }
2273 break;
2274 default:
2275 dev_dbg(dummy_dev(dum_hcd),
2276 "hub control req%04x v%04x i%04x l%d\n",
2277 typeReq, wValue, wIndex, wLength);
2278 error:
2279 /* "protocol stall" on error */
2280 retval = -EPIPE;
2281 }
2282 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2283
2284 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2285 usb_hcd_poll_rh_status(hcd);
2286 return retval;
2287 }
2288
2289 static int dummy_bus_suspend(struct usb_hcd *hcd)
2290 {
2291 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2292
2293 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2294
2295 spin_lock_irq(&dum_hcd->dum->lock);
2296 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2297 set_link_state(dum_hcd);
2298 hcd->state = HC_STATE_SUSPENDED;
2299 spin_unlock_irq(&dum_hcd->dum->lock);
2300 return 0;
2301 }
2302
2303 static int dummy_bus_resume(struct usb_hcd *hcd)
2304 {
2305 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2306 int rc = 0;
2307
2308 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2309
2310 spin_lock_irq(&dum_hcd->dum->lock);
2311 if (!HCD_HW_ACCESSIBLE(hcd)) {
2312 rc = -ESHUTDOWN;
2313 } else {
2314 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2315 set_link_state(dum_hcd);
2316 if (!list_empty(&dum_hcd->urbp_list))
2317 mod_timer(&dum_hcd->timer, jiffies);
2318 hcd->state = HC_STATE_RUNNING;
2319 }
2320 spin_unlock_irq(&dum_hcd->dum->lock);
2321 return rc;
2322 }
2323
2324 /*-------------------------------------------------------------------------*/
2325
2326 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2327 {
2328 int ep = usb_pipeendpoint(urb->pipe);
2329
2330 return snprintf(buf, size,
2331 "urb/%p %s ep%d%s%s len %d/%d\n",
2332 urb,
2333 ({ char *s;
2334 switch (urb->dev->speed) {
2335 case USB_SPEED_LOW:
2336 s = "ls";
2337 break;
2338 case USB_SPEED_FULL:
2339 s = "fs";
2340 break;
2341 case USB_SPEED_HIGH:
2342 s = "hs";
2343 break;
2344 case USB_SPEED_SUPER:
2345 s = "ss";
2346 break;
2347 default:
2348 s = "?";
2349 break;
2350 } s; }),
2351 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2352 ({ char *s; \
2353 switch (usb_pipetype(urb->pipe)) { \
2354 case PIPE_CONTROL: \
2355 s = ""; \
2356 break; \
2357 case PIPE_BULK: \
2358 s = "-bulk"; \
2359 break; \
2360 case PIPE_INTERRUPT: \
2361 s = "-int"; \
2362 break; \
2363 default: \
2364 s = "-iso"; \
2365 break; \
2366 } s; }),
2367 urb->actual_length, urb->transfer_buffer_length);
2368 }
2369
2370 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2371 char *buf)
2372 {
2373 struct usb_hcd *hcd = dev_get_drvdata(dev);
2374 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2375 struct urbp *urbp;
2376 size_t size = 0;
2377 unsigned long flags;
2378
2379 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2380 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2381 size_t temp;
2382
2383 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2384 buf += temp;
2385 size += temp;
2386 }
2387 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2388
2389 return size;
2390 }
2391 static DEVICE_ATTR_RO(urbs);
2392
2393 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2394 {
2395 init_timer(&dum_hcd->timer);
2396 dum_hcd->timer.function = dummy_timer;
2397 dum_hcd->timer.data = (unsigned long)dum_hcd;
2398 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2399 dum_hcd->stream_en_ep = 0;
2400 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2401 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2402 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2403 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2404 #ifdef CONFIG_USB_OTG
2405 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2406 #endif
2407 return 0;
2408
2409 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2410 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2411 }
2412
2413 static int dummy_start(struct usb_hcd *hcd)
2414 {
2415 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2416
2417 /*
2418 * MASTER side init ... we emulate a root hub that'll only ever
2419 * talk to one device (the slave side). Also appears in sysfs,
2420 * just like more familiar pci-based HCDs.
2421 */
2422 if (!usb_hcd_is_primary_hcd(hcd))
2423 return dummy_start_ss(dum_hcd);
2424
2425 spin_lock_init(&dum_hcd->dum->lock);
2426 init_timer(&dum_hcd->timer);
2427 dum_hcd->timer.function = dummy_timer;
2428 dum_hcd->timer.data = (unsigned long)dum_hcd;
2429 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2430
2431 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2432
2433 hcd->power_budget = POWER_BUDGET;
2434 hcd->state = HC_STATE_RUNNING;
2435 hcd->uses_new_polling = 1;
2436
2437 #ifdef CONFIG_USB_OTG
2438 hcd->self.otg_port = 1;
2439 #endif
2440
2441 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2442 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2443 }
2444
2445 static void dummy_stop(struct usb_hcd *hcd)
2446 {
2447 struct dummy *dum;
2448
2449 dum = hcd_to_dummy_hcd(hcd)->dum;
2450 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2451 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2452 }
2453
2454 /*-------------------------------------------------------------------------*/
2455
2456 static int dummy_h_get_frame(struct usb_hcd *hcd)
2457 {
2458 return dummy_g_get_frame(NULL);
2459 }
2460
2461 static int dummy_setup(struct usb_hcd *hcd)
2462 {
2463 struct dummy *dum;
2464
2465 dum = *((void **)dev_get_platdata(hcd->self.controller));
2466 hcd->self.sg_tablesize = ~0;
2467 if (usb_hcd_is_primary_hcd(hcd)) {
2468 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2469 dum->hs_hcd->dum = dum;
2470 /*
2471 * Mark the first roothub as being USB 2.0.
2472 * The USB 3.0 roothub will be registered later by
2473 * dummy_hcd_probe()
2474 */
2475 hcd->speed = HCD_USB2;
2476 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2477 } else {
2478 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2479 dum->ss_hcd->dum = dum;
2480 hcd->speed = HCD_USB3;
2481 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2482 }
2483 return 0;
2484 }
2485
2486 /* Change a group of bulk endpoints to support multiple stream IDs */
2487 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2488 struct usb_host_endpoint **eps, unsigned int num_eps,
2489 unsigned int num_streams, gfp_t mem_flags)
2490 {
2491 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2492 unsigned long flags;
2493 int max_stream;
2494 int ret_streams = num_streams;
2495 unsigned int index;
2496 unsigned int i;
2497
2498 if (!num_eps)
2499 return -EINVAL;
2500
2501 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2502 for (i = 0; i < num_eps; i++) {
2503 index = dummy_get_ep_idx(&eps[i]->desc);
2504 if ((1 << index) & dum_hcd->stream_en_ep) {
2505 ret_streams = -EINVAL;
2506 goto out;
2507 }
2508 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2509 if (!max_stream) {
2510 ret_streams = -EINVAL;
2511 goto out;
2512 }
2513 if (max_stream < ret_streams) {
2514 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2515 "stream IDs.\n",
2516 eps[i]->desc.bEndpointAddress,
2517 max_stream);
2518 ret_streams = max_stream;
2519 }
2520 }
2521
2522 for (i = 0; i < num_eps; i++) {
2523 index = dummy_get_ep_idx(&eps[i]->desc);
2524 dum_hcd->stream_en_ep |= 1 << index;
2525 set_max_streams_for_pipe(dum_hcd,
2526 usb_endpoint_num(&eps[i]->desc), ret_streams);
2527 }
2528 out:
2529 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2530 return ret_streams;
2531 }
2532
2533 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2534 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2535 struct usb_host_endpoint **eps, unsigned int num_eps,
2536 gfp_t mem_flags)
2537 {
2538 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2539 unsigned long flags;
2540 int ret;
2541 unsigned int index;
2542 unsigned int i;
2543
2544 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2545 for (i = 0; i < num_eps; i++) {
2546 index = dummy_get_ep_idx(&eps[i]->desc);
2547 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2548 ret = -EINVAL;
2549 goto out;
2550 }
2551 }
2552
2553 for (i = 0; i < num_eps; i++) {
2554 index = dummy_get_ep_idx(&eps[i]->desc);
2555 dum_hcd->stream_en_ep &= ~(1 << index);
2556 set_max_streams_for_pipe(dum_hcd,
2557 usb_endpoint_num(&eps[i]->desc), 0);
2558 }
2559 ret = 0;
2560 out:
2561 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2562 return ret;
2563 }
2564
2565 static struct hc_driver dummy_hcd = {
2566 .description = (char *) driver_name,
2567 .product_desc = "Dummy host controller",
2568 .hcd_priv_size = sizeof(struct dummy_hcd),
2569
2570 .flags = HCD_USB3 | HCD_SHARED,
2571
2572 .reset = dummy_setup,
2573 .start = dummy_start,
2574 .stop = dummy_stop,
2575
2576 .urb_enqueue = dummy_urb_enqueue,
2577 .urb_dequeue = dummy_urb_dequeue,
2578
2579 .get_frame_number = dummy_h_get_frame,
2580
2581 .hub_status_data = dummy_hub_status,
2582 .hub_control = dummy_hub_control,
2583 .bus_suspend = dummy_bus_suspend,
2584 .bus_resume = dummy_bus_resume,
2585
2586 .alloc_streams = dummy_alloc_streams,
2587 .free_streams = dummy_free_streams,
2588 };
2589
2590 static int dummy_hcd_probe(struct platform_device *pdev)
2591 {
2592 struct dummy *dum;
2593 struct usb_hcd *hs_hcd;
2594 struct usb_hcd *ss_hcd;
2595 int retval;
2596
2597 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2598 dum = *((void **)dev_get_platdata(&pdev->dev));
2599
2600 if (!mod_data.is_super_speed)
2601 dummy_hcd.flags = HCD_USB2;
2602 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2603 if (!hs_hcd)
2604 return -ENOMEM;
2605 hs_hcd->has_tt = 1;
2606
2607 retval = usb_add_hcd(hs_hcd, 0, 0);
2608 if (retval)
2609 goto put_usb2_hcd;
2610
2611 if (mod_data.is_super_speed) {
2612 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2613 dev_name(&pdev->dev), hs_hcd);
2614 if (!ss_hcd) {
2615 retval = -ENOMEM;
2616 goto dealloc_usb2_hcd;
2617 }
2618
2619 retval = usb_add_hcd(ss_hcd, 0, 0);
2620 if (retval)
2621 goto put_usb3_hcd;
2622 }
2623 return 0;
2624
2625 put_usb3_hcd:
2626 usb_put_hcd(ss_hcd);
2627 dealloc_usb2_hcd:
2628 usb_remove_hcd(hs_hcd);
2629 put_usb2_hcd:
2630 usb_put_hcd(hs_hcd);
2631 dum->hs_hcd = dum->ss_hcd = NULL;
2632 return retval;
2633 }
2634
2635 static int dummy_hcd_remove(struct platform_device *pdev)
2636 {
2637 struct dummy *dum;
2638
2639 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2640
2641 if (dum->ss_hcd) {
2642 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2643 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2644 }
2645
2646 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2647 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2648
2649 dum->hs_hcd = NULL;
2650 dum->ss_hcd = NULL;
2651
2652 return 0;
2653 }
2654
2655 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2656 {
2657 struct usb_hcd *hcd;
2658 struct dummy_hcd *dum_hcd;
2659 int rc = 0;
2660
2661 dev_dbg(&pdev->dev, "%s\n", __func__);
2662
2663 hcd = platform_get_drvdata(pdev);
2664 dum_hcd = hcd_to_dummy_hcd(hcd);
2665 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2666 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2667 rc = -EBUSY;
2668 } else
2669 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2670 return rc;
2671 }
2672
2673 static int dummy_hcd_resume(struct platform_device *pdev)
2674 {
2675 struct usb_hcd *hcd;
2676
2677 dev_dbg(&pdev->dev, "%s\n", __func__);
2678
2679 hcd = platform_get_drvdata(pdev);
2680 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2681 usb_hcd_poll_rh_status(hcd);
2682 return 0;
2683 }
2684
2685 static struct platform_driver dummy_hcd_driver = {
2686 .probe = dummy_hcd_probe,
2687 .remove = dummy_hcd_remove,
2688 .suspend = dummy_hcd_suspend,
2689 .resume = dummy_hcd_resume,
2690 .driver = {
2691 .name = (char *) driver_name,
2692 },
2693 };
2694
2695 /*-------------------------------------------------------------------------*/
2696 #define MAX_NUM_UDC 2
2697 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2698 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2699
2700 static int __init init(void)
2701 {
2702 int retval = -ENOMEM;
2703 int i;
2704 struct dummy *dum[MAX_NUM_UDC];
2705
2706 if (usb_disabled())
2707 return -ENODEV;
2708
2709 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2710 return -EINVAL;
2711
2712 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2713 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2714 MAX_NUM_UDC);
2715 return -EINVAL;
2716 }
2717
2718 for (i = 0; i < mod_data.num; i++) {
2719 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2720 if (!the_hcd_pdev[i]) {
2721 i--;
2722 while (i >= 0)
2723 platform_device_put(the_hcd_pdev[i--]);
2724 return retval;
2725 }
2726 }
2727 for (i = 0; i < mod_data.num; i++) {
2728 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2729 if (!the_udc_pdev[i]) {
2730 i--;
2731 while (i >= 0)
2732 platform_device_put(the_udc_pdev[i--]);
2733 goto err_alloc_udc;
2734 }
2735 }
2736 for (i = 0; i < mod_data.num; i++) {
2737 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2738 if (!dum[i]) {
2739 retval = -ENOMEM;
2740 goto err_add_pdata;
2741 }
2742 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2743 sizeof(void *));
2744 if (retval)
2745 goto err_add_pdata;
2746 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2747 sizeof(void *));
2748 if (retval)
2749 goto err_add_pdata;
2750 }
2751
2752 retval = platform_driver_register(&dummy_hcd_driver);
2753 if (retval < 0)
2754 goto err_add_pdata;
2755 retval = platform_driver_register(&dummy_udc_driver);
2756 if (retval < 0)
2757 goto err_register_udc_driver;
2758
2759 for (i = 0; i < mod_data.num; i++) {
2760 retval = platform_device_add(the_hcd_pdev[i]);
2761 if (retval < 0) {
2762 i--;
2763 while (i >= 0)
2764 platform_device_del(the_hcd_pdev[i--]);
2765 goto err_add_hcd;
2766 }
2767 }
2768 for (i = 0; i < mod_data.num; i++) {
2769 if (!dum[i]->hs_hcd ||
2770 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2771 /*
2772 * The hcd was added successfully but its probe
2773 * function failed for some reason.
2774 */
2775 retval = -EINVAL;
2776 goto err_add_udc;
2777 }
2778 }
2779
2780 for (i = 0; i < mod_data.num; i++) {
2781 retval = platform_device_add(the_udc_pdev[i]);
2782 if (retval < 0) {
2783 i--;
2784 while (i >= 0)
2785 platform_device_del(the_udc_pdev[i]);
2786 goto err_add_udc;
2787 }
2788 }
2789
2790 for (i = 0; i < mod_data.num; i++) {
2791 if (!platform_get_drvdata(the_udc_pdev[i])) {
2792 /*
2793 * The udc was added successfully but its probe
2794 * function failed for some reason.
2795 */
2796 retval = -EINVAL;
2797 goto err_probe_udc;
2798 }
2799 }
2800 return retval;
2801
2802 err_probe_udc:
2803 for (i = 0; i < mod_data.num; i++)
2804 platform_device_del(the_udc_pdev[i]);
2805 err_add_udc:
2806 for (i = 0; i < mod_data.num; i++)
2807 platform_device_del(the_hcd_pdev[i]);
2808 err_add_hcd:
2809 platform_driver_unregister(&dummy_udc_driver);
2810 err_register_udc_driver:
2811 platform_driver_unregister(&dummy_hcd_driver);
2812 err_add_pdata:
2813 for (i = 0; i < mod_data.num; i++)
2814 kfree(dum[i]);
2815 for (i = 0; i < mod_data.num; i++)
2816 platform_device_put(the_udc_pdev[i]);
2817 err_alloc_udc:
2818 for (i = 0; i < mod_data.num; i++)
2819 platform_device_put(the_hcd_pdev[i]);
2820 return retval;
2821 }
2822 module_init(init);
2823
2824 static void __exit cleanup(void)
2825 {
2826 int i;
2827
2828 for (i = 0; i < mod_data.num; i++) {
2829 struct dummy *dum;
2830
2831 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2832
2833 platform_device_unregister(the_udc_pdev[i]);
2834 platform_device_unregister(the_hcd_pdev[i]);
2835 kfree(dum);
2836 }
2837 platform_driver_unregister(&dummy_udc_driver);
2838 platform_driver_unregister(&dummy_hcd_driver);
2839 }
2840 module_exit(cleanup);
Linux kernel - Deliverables
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