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Merge branches 'thermal-core' and 'thermal-soc' into for-rc
[mirror_ubuntu-artful-kernel.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);
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_request *req;
651
652 if (!_ep)
653 return NULL;
654
655 req = kzalloc(sizeof(*req), mem_flags);
656 if (!req)
657 return NULL;
658 INIT_LIST_HEAD(&req->queue);
659 return &req->req;
660 }
661
662 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
663 {
664 struct dummy_request *req;
665
666 if (!_ep || !_req) {
667 WARN_ON(1);
668 return;
669 }
670
671 req = usb_request_to_dummy_request(_req);
672 WARN_ON(!list_empty(&req->queue));
673 kfree(req);
674 }
675
676 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
677 {
678 }
679
680 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
681 gfp_t mem_flags)
682 {
683 struct dummy_ep *ep;
684 struct dummy_request *req;
685 struct dummy *dum;
686 struct dummy_hcd *dum_hcd;
687 unsigned long flags;
688
689 req = usb_request_to_dummy_request(_req);
690 if (!_req || !list_empty(&req->queue) || !_req->complete)
691 return -EINVAL;
692
693 ep = usb_ep_to_dummy_ep(_ep);
694 if (!_ep || (!ep->desc && _ep->name != ep0name))
695 return -EINVAL;
696
697 dum = ep_to_dummy(ep);
698 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
699 if (!dum->driver || !is_enabled(dum_hcd))
700 return -ESHUTDOWN;
701
702 #if 0
703 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
704 ep, _req, _ep->name, _req->length, _req->buf);
705 #endif
706 _req->status = -EINPROGRESS;
707 _req->actual = 0;
708 spin_lock_irqsave(&dum->lock, flags);
709
710 /* implement an emulated single-request FIFO */
711 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
712 list_empty(&dum->fifo_req.queue) &&
713 list_empty(&ep->queue) &&
714 _req->length <= FIFO_SIZE) {
715 req = &dum->fifo_req;
716 req->req = *_req;
717 req->req.buf = dum->fifo_buf;
718 memcpy(dum->fifo_buf, _req->buf, _req->length);
719 req->req.context = dum;
720 req->req.complete = fifo_complete;
721
722 list_add_tail(&req->queue, &ep->queue);
723 spin_unlock(&dum->lock);
724 _req->actual = _req->length;
725 _req->status = 0;
726 usb_gadget_giveback_request(_ep, _req);
727 spin_lock(&dum->lock);
728 } else
729 list_add_tail(&req->queue, &ep->queue);
730 spin_unlock_irqrestore(&dum->lock, flags);
731
732 /* real hardware would likely enable transfers here, in case
733 * it'd been left NAKing.
734 */
735 return 0;
736 }
737
738 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
739 {
740 struct dummy_ep *ep;
741 struct dummy *dum;
742 int retval = -EINVAL;
743 unsigned long flags;
744 struct dummy_request *req = NULL;
745
746 if (!_ep || !_req)
747 return retval;
748 ep = usb_ep_to_dummy_ep(_ep);
749 dum = ep_to_dummy(ep);
750
751 if (!dum->driver)
752 return -ESHUTDOWN;
753
754 local_irq_save(flags);
755 spin_lock(&dum->lock);
756 list_for_each_entry(req, &ep->queue, queue) {
757 if (&req->req == _req) {
758 list_del_init(&req->queue);
759 _req->status = -ECONNRESET;
760 retval = 0;
761 break;
762 }
763 }
764 spin_unlock(&dum->lock);
765
766 if (retval == 0) {
767 dev_dbg(udc_dev(dum),
768 "dequeued req %p from %s, len %d buf %p\n",
769 req, _ep->name, _req->length, _req->buf);
770 usb_gadget_giveback_request(_ep, _req);
771 }
772 local_irq_restore(flags);
773 return retval;
774 }
775
776 static int
777 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
778 {
779 struct dummy_ep *ep;
780 struct dummy *dum;
781
782 if (!_ep)
783 return -EINVAL;
784 ep = usb_ep_to_dummy_ep(_ep);
785 dum = ep_to_dummy(ep);
786 if (!dum->driver)
787 return -ESHUTDOWN;
788 if (!value)
789 ep->halted = ep->wedged = 0;
790 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
791 !list_empty(&ep->queue))
792 return -EAGAIN;
793 else {
794 ep->halted = 1;
795 if (wedged)
796 ep->wedged = 1;
797 }
798 /* FIXME clear emulated data toggle too */
799 return 0;
800 }
801
802 static int
803 dummy_set_halt(struct usb_ep *_ep, int value)
804 {
805 return dummy_set_halt_and_wedge(_ep, value, 0);
806 }
807
808 static int dummy_set_wedge(struct usb_ep *_ep)
809 {
810 if (!_ep || _ep->name == ep0name)
811 return -EINVAL;
812 return dummy_set_halt_and_wedge(_ep, 1, 1);
813 }
814
815 static const struct usb_ep_ops dummy_ep_ops = {
816 .enable = dummy_enable,
817 .disable = dummy_disable,
818
819 .alloc_request = dummy_alloc_request,
820 .free_request = dummy_free_request,
821
822 .queue = dummy_queue,
823 .dequeue = dummy_dequeue,
824
825 .set_halt = dummy_set_halt,
826 .set_wedge = dummy_set_wedge,
827 };
828
829 /*-------------------------------------------------------------------------*/
830
831 /* there are both host and device side versions of this call ... */
832 static int dummy_g_get_frame(struct usb_gadget *_gadget)
833 {
834 struct timespec64 ts64;
835
836 ktime_get_ts64(&ts64);
837 return ts64.tv_nsec / NSEC_PER_MSEC;
838 }
839
840 static int dummy_wakeup(struct usb_gadget *_gadget)
841 {
842 struct dummy_hcd *dum_hcd;
843
844 dum_hcd = gadget_to_dummy_hcd(_gadget);
845 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
846 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
847 return -EINVAL;
848 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
849 return -ENOLINK;
850 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
851 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
852 return -EIO;
853
854 /* FIXME: What if the root hub is suspended but the port isn't? */
855
856 /* hub notices our request, issues downstream resume, etc */
857 dum_hcd->resuming = 1;
858 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
859 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
860 return 0;
861 }
862
863 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
864 {
865 struct dummy *dum;
866
867 _gadget->is_selfpowered = (value != 0);
868 dum = gadget_to_dummy_hcd(_gadget)->dum;
869 if (value)
870 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
871 else
872 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
873 return 0;
874 }
875
876 static void dummy_udc_update_ep0(struct dummy *dum)
877 {
878 if (dum->gadget.speed == USB_SPEED_SUPER)
879 dum->ep[0].ep.maxpacket = 9;
880 else
881 dum->ep[0].ep.maxpacket = 64;
882 }
883
884 static int dummy_pullup(struct usb_gadget *_gadget, int value)
885 {
886 struct dummy_hcd *dum_hcd;
887 struct dummy *dum;
888 unsigned long flags;
889
890 dum = gadget_dev_to_dummy(&_gadget->dev);
891
892 if (value && dum->driver) {
893 if (mod_data.is_super_speed)
894 dum->gadget.speed = dum->driver->max_speed;
895 else if (mod_data.is_high_speed)
896 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
897 dum->driver->max_speed);
898 else
899 dum->gadget.speed = USB_SPEED_FULL;
900 dummy_udc_update_ep0(dum);
901
902 if (dum->gadget.speed < dum->driver->max_speed)
903 dev_dbg(udc_dev(dum), "This device can perform faster"
904 " if you connect it to a %s port...\n",
905 usb_speed_string(dum->driver->max_speed));
906 }
907 dum_hcd = gadget_to_dummy_hcd(_gadget);
908
909 spin_lock_irqsave(&dum->lock, flags);
910 dum->pullup = (value != 0);
911 set_link_state(dum_hcd);
912 spin_unlock_irqrestore(&dum->lock, flags);
913
914 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
915 return 0;
916 }
917
918 static int dummy_udc_start(struct usb_gadget *g,
919 struct usb_gadget_driver *driver);
920 static int dummy_udc_stop(struct usb_gadget *g);
921
922 static const struct usb_gadget_ops dummy_ops = {
923 .get_frame = dummy_g_get_frame,
924 .wakeup = dummy_wakeup,
925 .set_selfpowered = dummy_set_selfpowered,
926 .pullup = dummy_pullup,
927 .udc_start = dummy_udc_start,
928 .udc_stop = dummy_udc_stop,
929 };
930
931 /*-------------------------------------------------------------------------*/
932
933 /* "function" sysfs attribute */
934 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
935 char *buf)
936 {
937 struct dummy *dum = gadget_dev_to_dummy(dev);
938
939 if (!dum->driver || !dum->driver->function)
940 return 0;
941 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
942 }
943 static DEVICE_ATTR_RO(function);
944
945 /*-------------------------------------------------------------------------*/
946
947 /*
948 * Driver registration/unregistration.
949 *
950 * This is basically hardware-specific; there's usually only one real USB
951 * device (not host) controller since that's how USB devices are intended
952 * to work. So most implementations of these api calls will rely on the
953 * fact that only one driver will ever bind to the hardware. But curious
954 * hardware can be built with discrete components, so the gadget API doesn't
955 * require that assumption.
956 *
957 * For this emulator, it might be convenient to create a usb slave device
958 * for each driver that registers: just add to a big root hub.
959 */
960
961 static int dummy_udc_start(struct usb_gadget *g,
962 struct usb_gadget_driver *driver)
963 {
964 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
965 struct dummy *dum = dum_hcd->dum;
966
967 if (driver->max_speed == USB_SPEED_UNKNOWN)
968 return -EINVAL;
969
970 /*
971 * SLAVE side init ... the layer above hardware, which
972 * can't enumerate without help from the driver we're binding.
973 */
974
975 dum->devstatus = 0;
976 dum->driver = driver;
977
978 return 0;
979 }
980
981 static int dummy_udc_stop(struct usb_gadget *g)
982 {
983 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
984 struct dummy *dum = dum_hcd->dum;
985
986 dum->driver = NULL;
987
988 return 0;
989 }
990
991 #undef is_enabled
992
993 /* The gadget structure is stored inside the hcd structure and will be
994 * released along with it. */
995 static void init_dummy_udc_hw(struct dummy *dum)
996 {
997 int i;
998
999 INIT_LIST_HEAD(&dum->gadget.ep_list);
1000 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1001 struct dummy_ep *ep = &dum->ep[i];
1002
1003 if (!ep_info[i].name)
1004 break;
1005 ep->ep.name = ep_info[i].name;
1006 ep->ep.caps = ep_info[i].caps;
1007 ep->ep.ops = &dummy_ep_ops;
1008 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1009 ep->halted = ep->wedged = ep->already_seen =
1010 ep->setup_stage = 0;
1011 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1012 ep->ep.max_streams = 16;
1013 ep->last_io = jiffies;
1014 ep->gadget = &dum->gadget;
1015 ep->desc = NULL;
1016 INIT_LIST_HEAD(&ep->queue);
1017 }
1018
1019 dum->gadget.ep0 = &dum->ep[0].ep;
1020 list_del_init(&dum->ep[0].ep.ep_list);
1021 INIT_LIST_HEAD(&dum->fifo_req.queue);
1022
1023 #ifdef CONFIG_USB_OTG
1024 dum->gadget.is_otg = 1;
1025 #endif
1026 }
1027
1028 static int dummy_udc_probe(struct platform_device *pdev)
1029 {
1030 struct dummy *dum;
1031 int rc;
1032
1033 dum = *((void **)dev_get_platdata(&pdev->dev));
1034 dum->gadget.name = gadget_name;
1035 dum->gadget.ops = &dummy_ops;
1036 dum->gadget.max_speed = USB_SPEED_SUPER;
1037
1038 dum->gadget.dev.parent = &pdev->dev;
1039 init_dummy_udc_hw(dum);
1040
1041 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1042 if (rc < 0)
1043 goto err_udc;
1044
1045 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1046 if (rc < 0)
1047 goto err_dev;
1048 platform_set_drvdata(pdev, dum);
1049 return rc;
1050
1051 err_dev:
1052 usb_del_gadget_udc(&dum->gadget);
1053 err_udc:
1054 return rc;
1055 }
1056
1057 static int dummy_udc_remove(struct platform_device *pdev)
1058 {
1059 struct dummy *dum = platform_get_drvdata(pdev);
1060
1061 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1062 usb_del_gadget_udc(&dum->gadget);
1063 return 0;
1064 }
1065
1066 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1067 int suspend)
1068 {
1069 spin_lock_irq(&dum->lock);
1070 dum->udc_suspended = suspend;
1071 set_link_state(dum_hcd);
1072 spin_unlock_irq(&dum->lock);
1073 }
1074
1075 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1076 {
1077 struct dummy *dum = platform_get_drvdata(pdev);
1078 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1079
1080 dev_dbg(&pdev->dev, "%s\n", __func__);
1081 dummy_udc_pm(dum, dum_hcd, 1);
1082 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1083 return 0;
1084 }
1085
1086 static int dummy_udc_resume(struct platform_device *pdev)
1087 {
1088 struct dummy *dum = platform_get_drvdata(pdev);
1089 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1090
1091 dev_dbg(&pdev->dev, "%s\n", __func__);
1092 dummy_udc_pm(dum, dum_hcd, 0);
1093 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1094 return 0;
1095 }
1096
1097 static struct platform_driver dummy_udc_driver = {
1098 .probe = dummy_udc_probe,
1099 .remove = dummy_udc_remove,
1100 .suspend = dummy_udc_suspend,
1101 .resume = dummy_udc_resume,
1102 .driver = {
1103 .name = (char *) gadget_name,
1104 },
1105 };
1106
1107 /*-------------------------------------------------------------------------*/
1108
1109 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1110 {
1111 unsigned int index;
1112
1113 index = usb_endpoint_num(desc) << 1;
1114 if (usb_endpoint_dir_in(desc))
1115 index |= 1;
1116 return index;
1117 }
1118
1119 /* MASTER/HOST SIDE DRIVER
1120 *
1121 * this uses the hcd framework to hook up to host side drivers.
1122 * its root hub will only have one device, otherwise it acts like
1123 * a normal host controller.
1124 *
1125 * when urbs are queued, they're just stuck on a list that we
1126 * scan in a timer callback. that callback connects writes from
1127 * the host with reads from the device, and so on, based on the
1128 * usb 2.0 rules.
1129 */
1130
1131 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1132 {
1133 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1134 u32 index;
1135
1136 if (!usb_endpoint_xfer_bulk(desc))
1137 return 0;
1138
1139 index = dummy_get_ep_idx(desc);
1140 return (1 << index) & dum_hcd->stream_en_ep;
1141 }
1142
1143 /*
1144 * The max stream number is saved as a nibble so for the 30 possible endpoints
1145 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1146 * means we use only 1 stream). The maximum according to the spec is 16bit so
1147 * if the 16 stream limit is about to go, the array size should be incremented
1148 * to 30 elements of type u16.
1149 */
1150 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1151 unsigned int pipe)
1152 {
1153 int max_streams;
1154
1155 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1156 if (usb_pipeout(pipe))
1157 max_streams >>= 4;
1158 else
1159 max_streams &= 0xf;
1160 max_streams++;
1161 return max_streams;
1162 }
1163
1164 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1165 unsigned int pipe, unsigned int streams)
1166 {
1167 int max_streams;
1168
1169 streams--;
1170 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1171 if (usb_pipeout(pipe)) {
1172 streams <<= 4;
1173 max_streams &= 0xf;
1174 } else {
1175 max_streams &= 0xf0;
1176 }
1177 max_streams |= streams;
1178 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1179 }
1180
1181 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1182 {
1183 unsigned int max_streams;
1184 int enabled;
1185
1186 enabled = dummy_ep_stream_en(dum_hcd, urb);
1187 if (!urb->stream_id) {
1188 if (enabled)
1189 return -EINVAL;
1190 return 0;
1191 }
1192 if (!enabled)
1193 return -EINVAL;
1194
1195 max_streams = get_max_streams_for_pipe(dum_hcd,
1196 usb_pipeendpoint(urb->pipe));
1197 if (urb->stream_id > max_streams) {
1198 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1199 urb->stream_id);
1200 BUG();
1201 return -EINVAL;
1202 }
1203 return 0;
1204 }
1205
1206 static int dummy_urb_enqueue(
1207 struct usb_hcd *hcd,
1208 struct urb *urb,
1209 gfp_t mem_flags
1210 ) {
1211 struct dummy_hcd *dum_hcd;
1212 struct urbp *urbp;
1213 unsigned long flags;
1214 int rc;
1215
1216 urbp = kmalloc(sizeof *urbp, mem_flags);
1217 if (!urbp)
1218 return -ENOMEM;
1219 urbp->urb = urb;
1220 urbp->miter_started = 0;
1221
1222 dum_hcd = hcd_to_dummy_hcd(hcd);
1223 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1224
1225 rc = dummy_validate_stream(dum_hcd, urb);
1226 if (rc) {
1227 kfree(urbp);
1228 goto done;
1229 }
1230
1231 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1232 if (rc) {
1233 kfree(urbp);
1234 goto done;
1235 }
1236
1237 if (!dum_hcd->udev) {
1238 dum_hcd->udev = urb->dev;
1239 usb_get_dev(dum_hcd->udev);
1240 } else if (unlikely(dum_hcd->udev != urb->dev))
1241 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1242
1243 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1244 urb->hcpriv = urbp;
1245 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1246 urb->error_count = 1; /* mark as a new urb */
1247
1248 /* kick the scheduler, it'll do the rest */
1249 if (!timer_pending(&dum_hcd->timer))
1250 mod_timer(&dum_hcd->timer, jiffies + 1);
1251
1252 done:
1253 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1254 return rc;
1255 }
1256
1257 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1258 {
1259 struct dummy_hcd *dum_hcd;
1260 unsigned long flags;
1261 int rc;
1262
1263 /* giveback happens automatically in timer callback,
1264 * so make sure the callback happens */
1265 dum_hcd = hcd_to_dummy_hcd(hcd);
1266 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1267
1268 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1269 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1270 !list_empty(&dum_hcd->urbp_list))
1271 mod_timer(&dum_hcd->timer, jiffies);
1272
1273 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1274 return rc;
1275 }
1276
1277 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1278 u32 len)
1279 {
1280 void *ubuf, *rbuf;
1281 struct urbp *urbp = urb->hcpriv;
1282 int to_host;
1283 struct sg_mapping_iter *miter = &urbp->miter;
1284 u32 trans = 0;
1285 u32 this_sg;
1286 bool next_sg;
1287
1288 to_host = usb_pipein(urb->pipe);
1289 rbuf = req->req.buf + req->req.actual;
1290
1291 if (!urb->num_sgs) {
1292 ubuf = urb->transfer_buffer + urb->actual_length;
1293 if (to_host)
1294 memcpy(ubuf, rbuf, len);
1295 else
1296 memcpy(rbuf, ubuf, len);
1297 return len;
1298 }
1299
1300 if (!urbp->miter_started) {
1301 u32 flags = SG_MITER_ATOMIC;
1302
1303 if (to_host)
1304 flags |= SG_MITER_TO_SG;
1305 else
1306 flags |= SG_MITER_FROM_SG;
1307
1308 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1309 urbp->miter_started = 1;
1310 }
1311 next_sg = sg_miter_next(miter);
1312 if (next_sg == false) {
1313 WARN_ON_ONCE(1);
1314 return -EINVAL;
1315 }
1316 do {
1317 ubuf = miter->addr;
1318 this_sg = min_t(u32, len, miter->length);
1319 miter->consumed = this_sg;
1320 trans += this_sg;
1321
1322 if (to_host)
1323 memcpy(ubuf, rbuf, this_sg);
1324 else
1325 memcpy(rbuf, ubuf, this_sg);
1326 len -= this_sg;
1327
1328 if (!len)
1329 break;
1330 next_sg = sg_miter_next(miter);
1331 if (next_sg == false) {
1332 WARN_ON_ONCE(1);
1333 return -EINVAL;
1334 }
1335
1336 rbuf += this_sg;
1337 } while (1);
1338
1339 sg_miter_stop(miter);
1340 return trans;
1341 }
1342
1343 /* transfer up to a frame's worth; caller must own lock */
1344 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1345 struct dummy_ep *ep, int limit, int *status)
1346 {
1347 struct dummy *dum = dum_hcd->dum;
1348 struct dummy_request *req;
1349 int sent = 0;
1350
1351 top:
1352 /* if there's no request queued, the device is NAKing; return */
1353 list_for_each_entry(req, &ep->queue, queue) {
1354 unsigned host_len, dev_len, len;
1355 int is_short, to_host;
1356 int rescan = 0;
1357
1358 if (dummy_ep_stream_en(dum_hcd, urb)) {
1359 if ((urb->stream_id != req->req.stream_id))
1360 continue;
1361 }
1362
1363 /* 1..N packets of ep->ep.maxpacket each ... the last one
1364 * may be short (including zero length).
1365 *
1366 * writer can send a zlp explicitly (length 0) or implicitly
1367 * (length mod maxpacket zero, and 'zero' flag); they always
1368 * terminate reads.
1369 */
1370 host_len = urb->transfer_buffer_length - urb->actual_length;
1371 dev_len = req->req.length - req->req.actual;
1372 len = min(host_len, dev_len);
1373
1374 /* FIXME update emulated data toggle too */
1375
1376 to_host = usb_pipein(urb->pipe);
1377 if (unlikely(len == 0))
1378 is_short = 1;
1379 else {
1380 /* not enough bandwidth left? */
1381 if (limit < ep->ep.maxpacket && limit < len)
1382 break;
1383 len = min_t(unsigned, len, limit);
1384 if (len == 0)
1385 break;
1386
1387 /* send multiple of maxpacket first, then remainder */
1388 if (len >= ep->ep.maxpacket) {
1389 is_short = 0;
1390 if (len % ep->ep.maxpacket)
1391 rescan = 1;
1392 len -= len % ep->ep.maxpacket;
1393 } else {
1394 is_short = 1;
1395 }
1396
1397 len = dummy_perform_transfer(urb, req, len);
1398
1399 ep->last_io = jiffies;
1400 if ((int)len < 0) {
1401 req->req.status = len;
1402 } else {
1403 limit -= len;
1404 sent += len;
1405 urb->actual_length += len;
1406 req->req.actual += len;
1407 }
1408 }
1409
1410 /* short packets terminate, maybe with overflow/underflow.
1411 * it's only really an error to write too much.
1412 *
1413 * partially filling a buffer optionally blocks queue advances
1414 * (so completion handlers can clean up the queue) but we don't
1415 * need to emulate such data-in-flight.
1416 */
1417 if (is_short) {
1418 if (host_len == dev_len) {
1419 req->req.status = 0;
1420 *status = 0;
1421 } else if (to_host) {
1422 req->req.status = 0;
1423 if (dev_len > host_len)
1424 *status = -EOVERFLOW;
1425 else
1426 *status = 0;
1427 } else {
1428 *status = 0;
1429 if (host_len > dev_len)
1430 req->req.status = -EOVERFLOW;
1431 else
1432 req->req.status = 0;
1433 }
1434
1435 /*
1436 * many requests terminate without a short packet.
1437 * send a zlp if demanded by flags.
1438 */
1439 } else {
1440 if (req->req.length == req->req.actual) {
1441 if (req->req.zero && to_host)
1442 rescan = 1;
1443 else
1444 req->req.status = 0;
1445 }
1446 if (urb->transfer_buffer_length == urb->actual_length) {
1447 if (urb->transfer_flags & URB_ZERO_PACKET &&
1448 !to_host)
1449 rescan = 1;
1450 else
1451 *status = 0;
1452 }
1453 }
1454
1455 /* device side completion --> continuable */
1456 if (req->req.status != -EINPROGRESS) {
1457 list_del_init(&req->queue);
1458
1459 spin_unlock(&dum->lock);
1460 usb_gadget_giveback_request(&ep->ep, &req->req);
1461 spin_lock(&dum->lock);
1462
1463 /* requests might have been unlinked... */
1464 rescan = 1;
1465 }
1466
1467 /* host side completion --> terminate */
1468 if (*status != -EINPROGRESS)
1469 break;
1470
1471 /* rescan to continue with any other queued i/o */
1472 if (rescan)
1473 goto top;
1474 }
1475 return sent;
1476 }
1477
1478 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1479 {
1480 int limit = ep->ep.maxpacket;
1481
1482 if (dum->gadget.speed == USB_SPEED_HIGH) {
1483 int tmp;
1484
1485 /* high bandwidth mode */
1486 tmp = usb_endpoint_maxp_mult(ep->desc);
1487 tmp *= 8 /* applies to entire frame */;
1488 limit += limit * tmp;
1489 }
1490 if (dum->gadget.speed == USB_SPEED_SUPER) {
1491 switch (usb_endpoint_type(ep->desc)) {
1492 case USB_ENDPOINT_XFER_ISOC:
1493 /* Sec. 4.4.8.2 USB3.0 Spec */
1494 limit = 3 * 16 * 1024 * 8;
1495 break;
1496 case USB_ENDPOINT_XFER_INT:
1497 /* Sec. 4.4.7.2 USB3.0 Spec */
1498 limit = 3 * 1024 * 8;
1499 break;
1500 case USB_ENDPOINT_XFER_BULK:
1501 default:
1502 break;
1503 }
1504 }
1505 return limit;
1506 }
1507
1508 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1509 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1510 USB_PORT_STAT_SUSPEND)) \
1511 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1512
1513 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1514 {
1515 int i;
1516
1517 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1518 dum->ss_hcd : dum->hs_hcd)))
1519 return NULL;
1520 if ((address & ~USB_DIR_IN) == 0)
1521 return &dum->ep[0];
1522 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1523 struct dummy_ep *ep = &dum->ep[i];
1524
1525 if (!ep->desc)
1526 continue;
1527 if (ep->desc->bEndpointAddress == address)
1528 return ep;
1529 }
1530 return NULL;
1531 }
1532
1533 #undef is_active
1534
1535 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1536 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1537 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1538 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1539 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1540 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1541
1542
1543 /**
1544 * handle_control_request() - handles all control transfers
1545 * @dum: pointer to dummy (the_controller)
1546 * @urb: the urb request to handle
1547 * @setup: pointer to the setup data for a USB device control
1548 * request
1549 * @status: pointer to request handling status
1550 *
1551 * Return 0 - if the request was handled
1552 * 1 - if the request wasn't handles
1553 * error code on error
1554 */
1555 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1556 struct usb_ctrlrequest *setup,
1557 int *status)
1558 {
1559 struct dummy_ep *ep2;
1560 struct dummy *dum = dum_hcd->dum;
1561 int ret_val = 1;
1562 unsigned w_index;
1563 unsigned w_value;
1564
1565 w_index = le16_to_cpu(setup->wIndex);
1566 w_value = le16_to_cpu(setup->wValue);
1567 switch (setup->bRequest) {
1568 case USB_REQ_SET_ADDRESS:
1569 if (setup->bRequestType != Dev_Request)
1570 break;
1571 dum->address = w_value;
1572 *status = 0;
1573 dev_dbg(udc_dev(dum), "set_address = %d\n",
1574 w_value);
1575 ret_val = 0;
1576 break;
1577 case USB_REQ_SET_FEATURE:
1578 if (setup->bRequestType == Dev_Request) {
1579 ret_val = 0;
1580 switch (w_value) {
1581 case USB_DEVICE_REMOTE_WAKEUP:
1582 break;
1583 case USB_DEVICE_B_HNP_ENABLE:
1584 dum->gadget.b_hnp_enable = 1;
1585 break;
1586 case USB_DEVICE_A_HNP_SUPPORT:
1587 dum->gadget.a_hnp_support = 1;
1588 break;
1589 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1590 dum->gadget.a_alt_hnp_support = 1;
1591 break;
1592 case USB_DEVICE_U1_ENABLE:
1593 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1594 HCD_USB3)
1595 w_value = USB_DEV_STAT_U1_ENABLED;
1596 else
1597 ret_val = -EOPNOTSUPP;
1598 break;
1599 case USB_DEVICE_U2_ENABLE:
1600 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1601 HCD_USB3)
1602 w_value = USB_DEV_STAT_U2_ENABLED;
1603 else
1604 ret_val = -EOPNOTSUPP;
1605 break;
1606 case USB_DEVICE_LTM_ENABLE:
1607 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1608 HCD_USB3)
1609 w_value = USB_DEV_STAT_LTM_ENABLED;
1610 else
1611 ret_val = -EOPNOTSUPP;
1612 break;
1613 default:
1614 ret_val = -EOPNOTSUPP;
1615 }
1616 if (ret_val == 0) {
1617 dum->devstatus |= (1 << w_value);
1618 *status = 0;
1619 }
1620 } else if (setup->bRequestType == Ep_Request) {
1621 /* endpoint halt */
1622 ep2 = find_endpoint(dum, w_index);
1623 if (!ep2 || ep2->ep.name == ep0name) {
1624 ret_val = -EOPNOTSUPP;
1625 break;
1626 }
1627 ep2->halted = 1;
1628 ret_val = 0;
1629 *status = 0;
1630 }
1631 break;
1632 case USB_REQ_CLEAR_FEATURE:
1633 if (setup->bRequestType == Dev_Request) {
1634 ret_val = 0;
1635 switch (w_value) {
1636 case USB_DEVICE_REMOTE_WAKEUP:
1637 w_value = USB_DEVICE_REMOTE_WAKEUP;
1638 break;
1639 case USB_DEVICE_U1_ENABLE:
1640 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1641 HCD_USB3)
1642 w_value = USB_DEV_STAT_U1_ENABLED;
1643 else
1644 ret_val = -EOPNOTSUPP;
1645 break;
1646 case USB_DEVICE_U2_ENABLE:
1647 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1648 HCD_USB3)
1649 w_value = USB_DEV_STAT_U2_ENABLED;
1650 else
1651 ret_val = -EOPNOTSUPP;
1652 break;
1653 case USB_DEVICE_LTM_ENABLE:
1654 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1655 HCD_USB3)
1656 w_value = USB_DEV_STAT_LTM_ENABLED;
1657 else
1658 ret_val = -EOPNOTSUPP;
1659 break;
1660 default:
1661 ret_val = -EOPNOTSUPP;
1662 break;
1663 }
1664 if (ret_val == 0) {
1665 dum->devstatus &= ~(1 << w_value);
1666 *status = 0;
1667 }
1668 } else if (setup->bRequestType == Ep_Request) {
1669 /* endpoint halt */
1670 ep2 = find_endpoint(dum, w_index);
1671 if (!ep2) {
1672 ret_val = -EOPNOTSUPP;
1673 break;
1674 }
1675 if (!ep2->wedged)
1676 ep2->halted = 0;
1677 ret_val = 0;
1678 *status = 0;
1679 }
1680 break;
1681 case USB_REQ_GET_STATUS:
1682 if (setup->bRequestType == Dev_InRequest
1683 || setup->bRequestType == Intf_InRequest
1684 || setup->bRequestType == Ep_InRequest) {
1685 char *buf;
1686 /*
1687 * device: remote wakeup, selfpowered
1688 * interface: nothing
1689 * endpoint: halt
1690 */
1691 buf = (char *)urb->transfer_buffer;
1692 if (urb->transfer_buffer_length > 0) {
1693 if (setup->bRequestType == Ep_InRequest) {
1694 ep2 = find_endpoint(dum, w_index);
1695 if (!ep2) {
1696 ret_val = -EOPNOTSUPP;
1697 break;
1698 }
1699 buf[0] = ep2->halted;
1700 } else if (setup->bRequestType ==
1701 Dev_InRequest) {
1702 buf[0] = (u8)dum->devstatus;
1703 } else
1704 buf[0] = 0;
1705 }
1706 if (urb->transfer_buffer_length > 1)
1707 buf[1] = 0;
1708 urb->actual_length = min_t(u32, 2,
1709 urb->transfer_buffer_length);
1710 ret_val = 0;
1711 *status = 0;
1712 }
1713 break;
1714 }
1715 return ret_val;
1716 }
1717
1718 /* drive both sides of the transfers; looks like irq handlers to
1719 * both drivers except the callbacks aren't in_irq().
1720 */
1721 static void dummy_timer(unsigned long _dum_hcd)
1722 {
1723 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1724 struct dummy *dum = dum_hcd->dum;
1725 struct urbp *urbp, *tmp;
1726 unsigned long flags;
1727 int limit, total;
1728 int i;
1729
1730 /* simplistic model for one frame's bandwidth */
1731 switch (dum->gadget.speed) {
1732 case USB_SPEED_LOW:
1733 total = 8/*bytes*/ * 12/*packets*/;
1734 break;
1735 case USB_SPEED_FULL:
1736 total = 64/*bytes*/ * 19/*packets*/;
1737 break;
1738 case USB_SPEED_HIGH:
1739 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1740 break;
1741 case USB_SPEED_SUPER:
1742 /* Bus speed is 500000 bytes/ms, so use a little less */
1743 total = 490000;
1744 break;
1745 default:
1746 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1747 return;
1748 }
1749
1750 /* FIXME if HZ != 1000 this will probably misbehave ... */
1751
1752 /* look at each urb queued by the host side driver */
1753 spin_lock_irqsave(&dum->lock, flags);
1754
1755 if (!dum_hcd->udev) {
1756 dev_err(dummy_dev(dum_hcd),
1757 "timer fired with no URBs pending?\n");
1758 spin_unlock_irqrestore(&dum->lock, flags);
1759 return;
1760 }
1761
1762 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1763 if (!ep_info[i].name)
1764 break;
1765 dum->ep[i].already_seen = 0;
1766 }
1767
1768 restart:
1769 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1770 struct urb *urb;
1771 struct dummy_request *req;
1772 u8 address;
1773 struct dummy_ep *ep = NULL;
1774 int type;
1775 int status = -EINPROGRESS;
1776
1777 urb = urbp->urb;
1778 if (urb->unlinked)
1779 goto return_urb;
1780 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1781 continue;
1782 type = usb_pipetype(urb->pipe);
1783
1784 /* used up this frame's non-periodic bandwidth?
1785 * FIXME there's infinite bandwidth for control and
1786 * periodic transfers ... unrealistic.
1787 */
1788 if (total <= 0 && type == PIPE_BULK)
1789 continue;
1790
1791 /* find the gadget's ep for this request (if configured) */
1792 address = usb_pipeendpoint (urb->pipe);
1793 if (usb_pipein(urb->pipe))
1794 address |= USB_DIR_IN;
1795 ep = find_endpoint(dum, address);
1796 if (!ep) {
1797 /* set_configuration() disagreement */
1798 dev_dbg(dummy_dev(dum_hcd),
1799 "no ep configured for urb %p\n",
1800 urb);
1801 status = -EPROTO;
1802 goto return_urb;
1803 }
1804
1805 if (ep->already_seen)
1806 continue;
1807 ep->already_seen = 1;
1808 if (ep == &dum->ep[0] && urb->error_count) {
1809 ep->setup_stage = 1; /* a new urb */
1810 urb->error_count = 0;
1811 }
1812 if (ep->halted && !ep->setup_stage) {
1813 /* NOTE: must not be iso! */
1814 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1815 ep->ep.name, urb);
1816 status = -EPIPE;
1817 goto return_urb;
1818 }
1819 /* FIXME make sure both ends agree on maxpacket */
1820
1821 /* handle control requests */
1822 if (ep == &dum->ep[0] && ep->setup_stage) {
1823 struct usb_ctrlrequest setup;
1824 int value = 1;
1825
1826 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1827 /* paranoia, in case of stale queued data */
1828 list_for_each_entry(req, &ep->queue, queue) {
1829 list_del_init(&req->queue);
1830 req->req.status = -EOVERFLOW;
1831 dev_dbg(udc_dev(dum), "stale req = %p\n",
1832 req);
1833
1834 spin_unlock(&dum->lock);
1835 usb_gadget_giveback_request(&ep->ep, &req->req);
1836 spin_lock(&dum->lock);
1837 ep->already_seen = 0;
1838 goto restart;
1839 }
1840
1841 /* gadget driver never sees set_address or operations
1842 * on standard feature flags. some hardware doesn't
1843 * even expose them.
1844 */
1845 ep->last_io = jiffies;
1846 ep->setup_stage = 0;
1847 ep->halted = 0;
1848
1849 value = handle_control_request(dum_hcd, urb, &setup,
1850 &status);
1851
1852 /* gadget driver handles all other requests. block
1853 * until setup() returns; no reentrancy issues etc.
1854 */
1855 if (value > 0) {
1856 spin_unlock(&dum->lock);
1857 value = dum->driver->setup(&dum->gadget,
1858 &setup);
1859 spin_lock(&dum->lock);
1860
1861 if (value >= 0) {
1862 /* no delays (max 64KB data stage) */
1863 limit = 64*1024;
1864 goto treat_control_like_bulk;
1865 }
1866 /* error, see below */
1867 }
1868
1869 if (value < 0) {
1870 if (value != -EOPNOTSUPP)
1871 dev_dbg(udc_dev(dum),
1872 "setup --> %d\n",
1873 value);
1874 status = -EPIPE;
1875 urb->actual_length = 0;
1876 }
1877
1878 goto return_urb;
1879 }
1880
1881 /* non-control requests */
1882 limit = total;
1883 switch (usb_pipetype(urb->pipe)) {
1884 case PIPE_ISOCHRONOUS:
1885 /* FIXME is it urb->interval since the last xfer?
1886 * use urb->iso_frame_desc[i].
1887 * complete whether or not ep has requests queued.
1888 * report random errors, to debug drivers.
1889 */
1890 limit = max(limit, periodic_bytes(dum, ep));
1891 status = -ENOSYS;
1892 break;
1893
1894 case PIPE_INTERRUPT:
1895 /* FIXME is it urb->interval since the last xfer?
1896 * this almost certainly polls too fast.
1897 */
1898 limit = max(limit, periodic_bytes(dum, ep));
1899 /* FALLTHROUGH */
1900
1901 default:
1902 treat_control_like_bulk:
1903 ep->last_io = jiffies;
1904 total -= transfer(dum_hcd, urb, ep, limit, &status);
1905 break;
1906 }
1907
1908 /* incomplete transfer? */
1909 if (status == -EINPROGRESS)
1910 continue;
1911
1912 return_urb:
1913 list_del(&urbp->urbp_list);
1914 kfree(urbp);
1915 if (ep)
1916 ep->already_seen = ep->setup_stage = 0;
1917
1918 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1919 spin_unlock(&dum->lock);
1920 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1921 spin_lock(&dum->lock);
1922
1923 goto restart;
1924 }
1925
1926 if (list_empty(&dum_hcd->urbp_list)) {
1927 usb_put_dev(dum_hcd->udev);
1928 dum_hcd->udev = NULL;
1929 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1930 /* want a 1 msec delay here */
1931 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1932 }
1933
1934 spin_unlock_irqrestore(&dum->lock, flags);
1935 }
1936
1937 /*-------------------------------------------------------------------------*/
1938
1939 #define PORT_C_MASK \
1940 ((USB_PORT_STAT_C_CONNECTION \
1941 | USB_PORT_STAT_C_ENABLE \
1942 | USB_PORT_STAT_C_SUSPEND \
1943 | USB_PORT_STAT_C_OVERCURRENT \
1944 | USB_PORT_STAT_C_RESET) << 16)
1945
1946 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1947 {
1948 struct dummy_hcd *dum_hcd;
1949 unsigned long flags;
1950 int retval = 0;
1951
1952 dum_hcd = hcd_to_dummy_hcd(hcd);
1953
1954 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1955 if (!HCD_HW_ACCESSIBLE(hcd))
1956 goto done;
1957
1958 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1959 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1960 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1961 set_link_state(dum_hcd);
1962 }
1963
1964 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1965 *buf = (1 << 1);
1966 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1967 dum_hcd->port_status);
1968 retval = 1;
1969 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1970 usb_hcd_resume_root_hub(hcd);
1971 }
1972 done:
1973 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1974 return retval;
1975 }
1976
1977 /* usb 3.0 root hub device descriptor */
1978 static struct {
1979 struct usb_bos_descriptor bos;
1980 struct usb_ss_cap_descriptor ss_cap;
1981 } __packed usb3_bos_desc = {
1982
1983 .bos = {
1984 .bLength = USB_DT_BOS_SIZE,
1985 .bDescriptorType = USB_DT_BOS,
1986 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
1987 .bNumDeviceCaps = 1,
1988 },
1989 .ss_cap = {
1990 .bLength = USB_DT_USB_SS_CAP_SIZE,
1991 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
1992 .bDevCapabilityType = USB_SS_CAP_TYPE,
1993 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
1994 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
1995 },
1996 };
1997
1998 static inline void
1999 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2000 {
2001 memset(desc, 0, sizeof *desc);
2002 desc->bDescriptorType = USB_DT_SS_HUB;
2003 desc->bDescLength = 12;
2004 desc->wHubCharacteristics = cpu_to_le16(
2005 HUB_CHAR_INDV_PORT_LPSM |
2006 HUB_CHAR_COMMON_OCPM);
2007 desc->bNbrPorts = 1;
2008 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2009 desc->u.ss.DeviceRemovable = 0xffff;
2010 }
2011
2012 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2013 {
2014 memset(desc, 0, sizeof *desc);
2015 desc->bDescriptorType = USB_DT_HUB;
2016 desc->bDescLength = 9;
2017 desc->wHubCharacteristics = cpu_to_le16(
2018 HUB_CHAR_INDV_PORT_LPSM |
2019 HUB_CHAR_COMMON_OCPM);
2020 desc->bNbrPorts = 1;
2021 desc->u.hs.DeviceRemovable[0] = 0xff;
2022 desc->u.hs.DeviceRemovable[1] = 0xff;
2023 }
2024
2025 static int dummy_hub_control(
2026 struct usb_hcd *hcd,
2027 u16 typeReq,
2028 u16 wValue,
2029 u16 wIndex,
2030 char *buf,
2031 u16 wLength
2032 ) {
2033 struct dummy_hcd *dum_hcd;
2034 int retval = 0;
2035 unsigned long flags;
2036
2037 if (!HCD_HW_ACCESSIBLE(hcd))
2038 return -ETIMEDOUT;
2039
2040 dum_hcd = hcd_to_dummy_hcd(hcd);
2041
2042 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2043 switch (typeReq) {
2044 case ClearHubFeature:
2045 break;
2046 case ClearPortFeature:
2047 switch (wValue) {
2048 case USB_PORT_FEAT_SUSPEND:
2049 if (hcd->speed == HCD_USB3) {
2050 dev_dbg(dummy_dev(dum_hcd),
2051 "USB_PORT_FEAT_SUSPEND req not "
2052 "supported for USB 3.0 roothub\n");
2053 goto error;
2054 }
2055 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2056 /* 20msec resume signaling */
2057 dum_hcd->resuming = 1;
2058 dum_hcd->re_timeout = jiffies +
2059 msecs_to_jiffies(20);
2060 }
2061 break;
2062 case USB_PORT_FEAT_POWER:
2063 if (hcd->speed == HCD_USB3) {
2064 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
2065 dev_dbg(dummy_dev(dum_hcd),
2066 "power-off\n");
2067 } else
2068 if (dum_hcd->port_status &
2069 USB_SS_PORT_STAT_POWER)
2070 dev_dbg(dummy_dev(dum_hcd),
2071 "power-off\n");
2072 /* FALLS THROUGH */
2073 default:
2074 dum_hcd->port_status &= ~(1 << wValue);
2075 set_link_state(dum_hcd);
2076 }
2077 break;
2078 case GetHubDescriptor:
2079 if (hcd->speed == HCD_USB3 &&
2080 (wLength < USB_DT_SS_HUB_SIZE ||
2081 wValue != (USB_DT_SS_HUB << 8))) {
2082 dev_dbg(dummy_dev(dum_hcd),
2083 "Wrong hub descriptor type for "
2084 "USB 3.0 roothub.\n");
2085 goto error;
2086 }
2087 if (hcd->speed == HCD_USB3)
2088 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2089 else
2090 hub_descriptor((struct usb_hub_descriptor *) buf);
2091 break;
2092
2093 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2094 if (hcd->speed != HCD_USB3)
2095 goto error;
2096
2097 if ((wValue >> 8) != USB_DT_BOS)
2098 goto error;
2099
2100 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2101 retval = sizeof(usb3_bos_desc);
2102 break;
2103
2104 case GetHubStatus:
2105 *(__le32 *) buf = cpu_to_le32(0);
2106 break;
2107 case GetPortStatus:
2108 if (wIndex != 1)
2109 retval = -EPIPE;
2110
2111 /* whoever resets or resumes must GetPortStatus to
2112 * complete it!!
2113 */
2114 if (dum_hcd->resuming &&
2115 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2116 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2117 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2118 }
2119 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2120 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2121 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2122 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2123 if (dum_hcd->dum->pullup) {
2124 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2125
2126 if (hcd->speed < HCD_USB3) {
2127 switch (dum_hcd->dum->gadget.speed) {
2128 case USB_SPEED_HIGH:
2129 dum_hcd->port_status |=
2130 USB_PORT_STAT_HIGH_SPEED;
2131 break;
2132 case USB_SPEED_LOW:
2133 dum_hcd->dum->gadget.ep0->
2134 maxpacket = 8;
2135 dum_hcd->port_status |=
2136 USB_PORT_STAT_LOW_SPEED;
2137 break;
2138 default:
2139 dum_hcd->dum->gadget.speed =
2140 USB_SPEED_FULL;
2141 break;
2142 }
2143 }
2144 }
2145 }
2146 set_link_state(dum_hcd);
2147 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2148 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2149 break;
2150 case SetHubFeature:
2151 retval = -EPIPE;
2152 break;
2153 case SetPortFeature:
2154 switch (wValue) {
2155 case USB_PORT_FEAT_LINK_STATE:
2156 if (hcd->speed != HCD_USB3) {
2157 dev_dbg(dummy_dev(dum_hcd),
2158 "USB_PORT_FEAT_LINK_STATE req not "
2159 "supported for USB 2.0 roothub\n");
2160 goto error;
2161 }
2162 /*
2163 * Since this is dummy we don't have an actual link so
2164 * there is nothing to do for the SET_LINK_STATE cmd
2165 */
2166 break;
2167 case USB_PORT_FEAT_U1_TIMEOUT:
2168 case USB_PORT_FEAT_U2_TIMEOUT:
2169 /* TODO: add suspend/resume support! */
2170 if (hcd->speed != HCD_USB3) {
2171 dev_dbg(dummy_dev(dum_hcd),
2172 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2173 "supported for USB 2.0 roothub\n");
2174 goto error;
2175 }
2176 break;
2177 case USB_PORT_FEAT_SUSPEND:
2178 /* Applicable only for USB2.0 hub */
2179 if (hcd->speed == HCD_USB3) {
2180 dev_dbg(dummy_dev(dum_hcd),
2181 "USB_PORT_FEAT_SUSPEND req not "
2182 "supported for USB 3.0 roothub\n");
2183 goto error;
2184 }
2185 if (dum_hcd->active) {
2186 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2187
2188 /* HNP would happen here; for now we
2189 * assume b_bus_req is always true.
2190 */
2191 set_link_state(dum_hcd);
2192 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2193 & dum_hcd->dum->devstatus) != 0)
2194 dev_dbg(dummy_dev(dum_hcd),
2195 "no HNP yet!\n");
2196 }
2197 break;
2198 case USB_PORT_FEAT_POWER:
2199 if (hcd->speed == HCD_USB3)
2200 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2201 else
2202 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2203 set_link_state(dum_hcd);
2204 break;
2205 case USB_PORT_FEAT_BH_PORT_RESET:
2206 /* Applicable only for USB3.0 hub */
2207 if (hcd->speed != HCD_USB3) {
2208 dev_dbg(dummy_dev(dum_hcd),
2209 "USB_PORT_FEAT_BH_PORT_RESET req not "
2210 "supported for USB 2.0 roothub\n");
2211 goto error;
2212 }
2213 /* FALLS THROUGH */
2214 case USB_PORT_FEAT_RESET:
2215 /* if it's already enabled, disable */
2216 if (hcd->speed == HCD_USB3) {
2217 dum_hcd->port_status = 0;
2218 dum_hcd->port_status =
2219 (USB_SS_PORT_STAT_POWER |
2220 USB_PORT_STAT_CONNECTION |
2221 USB_PORT_STAT_RESET);
2222 } else
2223 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2224 | USB_PORT_STAT_LOW_SPEED
2225 | USB_PORT_STAT_HIGH_SPEED);
2226 /*
2227 * We want to reset device status. All but the
2228 * Self powered feature
2229 */
2230 dum_hcd->dum->devstatus &=
2231 (1 << USB_DEVICE_SELF_POWERED);
2232 /*
2233 * FIXME USB3.0: what is the correct reset signaling
2234 * interval? Is it still 50msec as for HS?
2235 */
2236 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2237 /* FALLS THROUGH */
2238 default:
2239 if (hcd->speed == HCD_USB3) {
2240 if ((dum_hcd->port_status &
2241 USB_SS_PORT_STAT_POWER) != 0) {
2242 dum_hcd->port_status |= (1 << wValue);
2243 set_link_state(dum_hcd);
2244 }
2245 } else
2246 if ((dum_hcd->port_status &
2247 USB_PORT_STAT_POWER) != 0) {
2248 dum_hcd->port_status |= (1 << wValue);
2249 set_link_state(dum_hcd);
2250 }
2251 }
2252 break;
2253 case GetPortErrorCount:
2254 if (hcd->speed != HCD_USB3) {
2255 dev_dbg(dummy_dev(dum_hcd),
2256 "GetPortErrorCount req not "
2257 "supported for USB 2.0 roothub\n");
2258 goto error;
2259 }
2260 /* We'll always return 0 since this is a dummy hub */
2261 *(__le32 *) buf = cpu_to_le32(0);
2262 break;
2263 case SetHubDepth:
2264 if (hcd->speed != HCD_USB3) {
2265 dev_dbg(dummy_dev(dum_hcd),
2266 "SetHubDepth req not supported for "
2267 "USB 2.0 roothub\n");
2268 goto error;
2269 }
2270 break;
2271 default:
2272 dev_dbg(dummy_dev(dum_hcd),
2273 "hub control req%04x v%04x i%04x l%d\n",
2274 typeReq, wValue, wIndex, wLength);
2275 error:
2276 /* "protocol stall" on error */
2277 retval = -EPIPE;
2278 }
2279 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2280
2281 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2282 usb_hcd_poll_rh_status(hcd);
2283 return retval;
2284 }
2285
2286 static int dummy_bus_suspend(struct usb_hcd *hcd)
2287 {
2288 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2289
2290 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2291
2292 spin_lock_irq(&dum_hcd->dum->lock);
2293 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2294 set_link_state(dum_hcd);
2295 hcd->state = HC_STATE_SUSPENDED;
2296 spin_unlock_irq(&dum_hcd->dum->lock);
2297 return 0;
2298 }
2299
2300 static int dummy_bus_resume(struct usb_hcd *hcd)
2301 {
2302 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2303 int rc = 0;
2304
2305 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2306
2307 spin_lock_irq(&dum_hcd->dum->lock);
2308 if (!HCD_HW_ACCESSIBLE(hcd)) {
2309 rc = -ESHUTDOWN;
2310 } else {
2311 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2312 set_link_state(dum_hcd);
2313 if (!list_empty(&dum_hcd->urbp_list))
2314 mod_timer(&dum_hcd->timer, jiffies);
2315 hcd->state = HC_STATE_RUNNING;
2316 }
2317 spin_unlock_irq(&dum_hcd->dum->lock);
2318 return rc;
2319 }
2320
2321 /*-------------------------------------------------------------------------*/
2322
2323 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2324 {
2325 int ep = usb_pipeendpoint(urb->pipe);
2326
2327 return snprintf(buf, size,
2328 "urb/%p %s ep%d%s%s len %d/%d\n",
2329 urb,
2330 ({ char *s;
2331 switch (urb->dev->speed) {
2332 case USB_SPEED_LOW:
2333 s = "ls";
2334 break;
2335 case USB_SPEED_FULL:
2336 s = "fs";
2337 break;
2338 case USB_SPEED_HIGH:
2339 s = "hs";
2340 break;
2341 case USB_SPEED_SUPER:
2342 s = "ss";
2343 break;
2344 default:
2345 s = "?";
2346 break;
2347 } s; }),
2348 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2349 ({ char *s; \
2350 switch (usb_pipetype(urb->pipe)) { \
2351 case PIPE_CONTROL: \
2352 s = ""; \
2353 break; \
2354 case PIPE_BULK: \
2355 s = "-bulk"; \
2356 break; \
2357 case PIPE_INTERRUPT: \
2358 s = "-int"; \
2359 break; \
2360 default: \
2361 s = "-iso"; \
2362 break; \
2363 } s; }),
2364 urb->actual_length, urb->transfer_buffer_length);
2365 }
2366
2367 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2368 char *buf)
2369 {
2370 struct usb_hcd *hcd = dev_get_drvdata(dev);
2371 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2372 struct urbp *urbp;
2373 size_t size = 0;
2374 unsigned long flags;
2375
2376 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2377 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2378 size_t temp;
2379
2380 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2381 buf += temp;
2382 size += temp;
2383 }
2384 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2385
2386 return size;
2387 }
2388 static DEVICE_ATTR_RO(urbs);
2389
2390 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2391 {
2392 init_timer(&dum_hcd->timer);
2393 dum_hcd->timer.function = dummy_timer;
2394 dum_hcd->timer.data = (unsigned long)dum_hcd;
2395 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2396 dum_hcd->stream_en_ep = 0;
2397 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2398 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2399 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2400 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2401 #ifdef CONFIG_USB_OTG
2402 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2403 #endif
2404 return 0;
2405
2406 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2407 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2408 }
2409
2410 static int dummy_start(struct usb_hcd *hcd)
2411 {
2412 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2413
2414 /*
2415 * MASTER side init ... we emulate a root hub that'll only ever
2416 * talk to one device (the slave side). Also appears in sysfs,
2417 * just like more familiar pci-based HCDs.
2418 */
2419 if (!usb_hcd_is_primary_hcd(hcd))
2420 return dummy_start_ss(dum_hcd);
2421
2422 spin_lock_init(&dum_hcd->dum->lock);
2423 init_timer(&dum_hcd->timer);
2424 dum_hcd->timer.function = dummy_timer;
2425 dum_hcd->timer.data = (unsigned long)dum_hcd;
2426 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2427
2428 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2429
2430 hcd->power_budget = POWER_BUDGET;
2431 hcd->state = HC_STATE_RUNNING;
2432 hcd->uses_new_polling = 1;
2433
2434 #ifdef CONFIG_USB_OTG
2435 hcd->self.otg_port = 1;
2436 #endif
2437
2438 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2439 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2440 }
2441
2442 static void dummy_stop(struct usb_hcd *hcd)
2443 {
2444 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2445 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2446 }
2447
2448 /*-------------------------------------------------------------------------*/
2449
2450 static int dummy_h_get_frame(struct usb_hcd *hcd)
2451 {
2452 return dummy_g_get_frame(NULL);
2453 }
2454
2455 static int dummy_setup(struct usb_hcd *hcd)
2456 {
2457 struct dummy *dum;
2458
2459 dum = *((void **)dev_get_platdata(hcd->self.controller));
2460 hcd->self.sg_tablesize = ~0;
2461 if (usb_hcd_is_primary_hcd(hcd)) {
2462 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2463 dum->hs_hcd->dum = dum;
2464 /*
2465 * Mark the first roothub as being USB 2.0.
2466 * The USB 3.0 roothub will be registered later by
2467 * dummy_hcd_probe()
2468 */
2469 hcd->speed = HCD_USB2;
2470 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2471 } else {
2472 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2473 dum->ss_hcd->dum = dum;
2474 hcd->speed = HCD_USB3;
2475 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2476 }
2477 return 0;
2478 }
2479
2480 /* Change a group of bulk endpoints to support multiple stream IDs */
2481 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2482 struct usb_host_endpoint **eps, unsigned int num_eps,
2483 unsigned int num_streams, gfp_t mem_flags)
2484 {
2485 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2486 unsigned long flags;
2487 int max_stream;
2488 int ret_streams = num_streams;
2489 unsigned int index;
2490 unsigned int i;
2491
2492 if (!num_eps)
2493 return -EINVAL;
2494
2495 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2496 for (i = 0; i < num_eps; i++) {
2497 index = dummy_get_ep_idx(&eps[i]->desc);
2498 if ((1 << index) & dum_hcd->stream_en_ep) {
2499 ret_streams = -EINVAL;
2500 goto out;
2501 }
2502 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2503 if (!max_stream) {
2504 ret_streams = -EINVAL;
2505 goto out;
2506 }
2507 if (max_stream < ret_streams) {
2508 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2509 "stream IDs.\n",
2510 eps[i]->desc.bEndpointAddress,
2511 max_stream);
2512 ret_streams = max_stream;
2513 }
2514 }
2515
2516 for (i = 0; i < num_eps; i++) {
2517 index = dummy_get_ep_idx(&eps[i]->desc);
2518 dum_hcd->stream_en_ep |= 1 << index;
2519 set_max_streams_for_pipe(dum_hcd,
2520 usb_endpoint_num(&eps[i]->desc), ret_streams);
2521 }
2522 out:
2523 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2524 return ret_streams;
2525 }
2526
2527 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2528 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2529 struct usb_host_endpoint **eps, unsigned int num_eps,
2530 gfp_t mem_flags)
2531 {
2532 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2533 unsigned long flags;
2534 int ret;
2535 unsigned int index;
2536 unsigned int i;
2537
2538 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2539 for (i = 0; i < num_eps; i++) {
2540 index = dummy_get_ep_idx(&eps[i]->desc);
2541 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2542 ret = -EINVAL;
2543 goto out;
2544 }
2545 }
2546
2547 for (i = 0; i < num_eps; i++) {
2548 index = dummy_get_ep_idx(&eps[i]->desc);
2549 dum_hcd->stream_en_ep &= ~(1 << index);
2550 set_max_streams_for_pipe(dum_hcd,
2551 usb_endpoint_num(&eps[i]->desc), 0);
2552 }
2553 ret = 0;
2554 out:
2555 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2556 return ret;
2557 }
2558
2559 static struct hc_driver dummy_hcd = {
2560 .description = (char *) driver_name,
2561 .product_desc = "Dummy host controller",
2562 .hcd_priv_size = sizeof(struct dummy_hcd),
2563
2564 .flags = HCD_USB3 | HCD_SHARED,
2565
2566 .reset = dummy_setup,
2567 .start = dummy_start,
2568 .stop = dummy_stop,
2569
2570 .urb_enqueue = dummy_urb_enqueue,
2571 .urb_dequeue = dummy_urb_dequeue,
2572
2573 .get_frame_number = dummy_h_get_frame,
2574
2575 .hub_status_data = dummy_hub_status,
2576 .hub_control = dummy_hub_control,
2577 .bus_suspend = dummy_bus_suspend,
2578 .bus_resume = dummy_bus_resume,
2579
2580 .alloc_streams = dummy_alloc_streams,
2581 .free_streams = dummy_free_streams,
2582 };
2583
2584 static int dummy_hcd_probe(struct platform_device *pdev)
2585 {
2586 struct dummy *dum;
2587 struct usb_hcd *hs_hcd;
2588 struct usb_hcd *ss_hcd;
2589 int retval;
2590
2591 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2592 dum = *((void **)dev_get_platdata(&pdev->dev));
2593
2594 if (!mod_data.is_super_speed)
2595 dummy_hcd.flags = HCD_USB2;
2596 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2597 if (!hs_hcd)
2598 return -ENOMEM;
2599 hs_hcd->has_tt = 1;
2600
2601 retval = usb_add_hcd(hs_hcd, 0, 0);
2602 if (retval)
2603 goto put_usb2_hcd;
2604
2605 if (mod_data.is_super_speed) {
2606 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2607 dev_name(&pdev->dev), hs_hcd);
2608 if (!ss_hcd) {
2609 retval = -ENOMEM;
2610 goto dealloc_usb2_hcd;
2611 }
2612
2613 retval = usb_add_hcd(ss_hcd, 0, 0);
2614 if (retval)
2615 goto put_usb3_hcd;
2616 }
2617 return 0;
2618
2619 put_usb3_hcd:
2620 usb_put_hcd(ss_hcd);
2621 dealloc_usb2_hcd:
2622 usb_remove_hcd(hs_hcd);
2623 put_usb2_hcd:
2624 usb_put_hcd(hs_hcd);
2625 dum->hs_hcd = dum->ss_hcd = NULL;
2626 return retval;
2627 }
2628
2629 static int dummy_hcd_remove(struct platform_device *pdev)
2630 {
2631 struct dummy *dum;
2632
2633 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2634
2635 if (dum->ss_hcd) {
2636 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2637 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2638 }
2639
2640 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2641 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2642
2643 dum->hs_hcd = NULL;
2644 dum->ss_hcd = NULL;
2645
2646 return 0;
2647 }
2648
2649 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2650 {
2651 struct usb_hcd *hcd;
2652 struct dummy_hcd *dum_hcd;
2653 int rc = 0;
2654
2655 dev_dbg(&pdev->dev, "%s\n", __func__);
2656
2657 hcd = platform_get_drvdata(pdev);
2658 dum_hcd = hcd_to_dummy_hcd(hcd);
2659 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2660 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2661 rc = -EBUSY;
2662 } else
2663 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2664 return rc;
2665 }
2666
2667 static int dummy_hcd_resume(struct platform_device *pdev)
2668 {
2669 struct usb_hcd *hcd;
2670
2671 dev_dbg(&pdev->dev, "%s\n", __func__);
2672
2673 hcd = platform_get_drvdata(pdev);
2674 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2675 usb_hcd_poll_rh_status(hcd);
2676 return 0;
2677 }
2678
2679 static struct platform_driver dummy_hcd_driver = {
2680 .probe = dummy_hcd_probe,
2681 .remove = dummy_hcd_remove,
2682 .suspend = dummy_hcd_suspend,
2683 .resume = dummy_hcd_resume,
2684 .driver = {
2685 .name = (char *) driver_name,
2686 },
2687 };
2688
2689 /*-------------------------------------------------------------------------*/
2690 #define MAX_NUM_UDC 2
2691 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2692 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2693
2694 static int __init init(void)
2695 {
2696 int retval = -ENOMEM;
2697 int i;
2698 struct dummy *dum[MAX_NUM_UDC];
2699
2700 if (usb_disabled())
2701 return -ENODEV;
2702
2703 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2704 return -EINVAL;
2705
2706 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2707 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2708 MAX_NUM_UDC);
2709 return -EINVAL;
2710 }
2711
2712 for (i = 0; i < mod_data.num; i++) {
2713 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2714 if (!the_hcd_pdev[i]) {
2715 i--;
2716 while (i >= 0)
2717 platform_device_put(the_hcd_pdev[i--]);
2718 return retval;
2719 }
2720 }
2721 for (i = 0; i < mod_data.num; i++) {
2722 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2723 if (!the_udc_pdev[i]) {
2724 i--;
2725 while (i >= 0)
2726 platform_device_put(the_udc_pdev[i--]);
2727 goto err_alloc_udc;
2728 }
2729 }
2730 for (i = 0; i < mod_data.num; i++) {
2731 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2732 if (!dum[i]) {
2733 retval = -ENOMEM;
2734 goto err_add_pdata;
2735 }
2736 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2737 sizeof(void *));
2738 if (retval)
2739 goto err_add_pdata;
2740 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2741 sizeof(void *));
2742 if (retval)
2743 goto err_add_pdata;
2744 }
2745
2746 retval = platform_driver_register(&dummy_hcd_driver);
2747 if (retval < 0)
2748 goto err_add_pdata;
2749 retval = platform_driver_register(&dummy_udc_driver);
2750 if (retval < 0)
2751 goto err_register_udc_driver;
2752
2753 for (i = 0; i < mod_data.num; i++) {
2754 retval = platform_device_add(the_hcd_pdev[i]);
2755 if (retval < 0) {
2756 i--;
2757 while (i >= 0)
2758 platform_device_del(the_hcd_pdev[i--]);
2759 goto err_add_hcd;
2760 }
2761 }
2762 for (i = 0; i < mod_data.num; i++) {
2763 if (!dum[i]->hs_hcd ||
2764 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2765 /*
2766 * The hcd was added successfully but its probe
2767 * function failed for some reason.
2768 */
2769 retval = -EINVAL;
2770 goto err_add_udc;
2771 }
2772 }
2773
2774 for (i = 0; i < mod_data.num; i++) {
2775 retval = platform_device_add(the_udc_pdev[i]);
2776 if (retval < 0) {
2777 i--;
2778 while (i >= 0)
2779 platform_device_del(the_udc_pdev[i]);
2780 goto err_add_udc;
2781 }
2782 }
2783
2784 for (i = 0; i < mod_data.num; i++) {
2785 if (!platform_get_drvdata(the_udc_pdev[i])) {
2786 /*
2787 * The udc was added successfully but its probe
2788 * function failed for some reason.
2789 */
2790 retval = -EINVAL;
2791 goto err_probe_udc;
2792 }
2793 }
2794 return retval;
2795
2796 err_probe_udc:
2797 for (i = 0; i < mod_data.num; i++)
2798 platform_device_del(the_udc_pdev[i]);
2799 err_add_udc:
2800 for (i = 0; i < mod_data.num; i++)
2801 platform_device_del(the_hcd_pdev[i]);
2802 err_add_hcd:
2803 platform_driver_unregister(&dummy_udc_driver);
2804 err_register_udc_driver:
2805 platform_driver_unregister(&dummy_hcd_driver);
2806 err_add_pdata:
2807 for (i = 0; i < mod_data.num; i++)
2808 kfree(dum[i]);
2809 for (i = 0; i < mod_data.num; i++)
2810 platform_device_put(the_udc_pdev[i]);
2811 err_alloc_udc:
2812 for (i = 0; i < mod_data.num; i++)
2813 platform_device_put(the_hcd_pdev[i]);
2814 return retval;
2815 }
2816 module_init(init);
2817
2818 static void __exit cleanup(void)
2819 {
2820 int i;
2821
2822 for (i = 0; i < mod_data.num; i++) {
2823 struct dummy *dum;
2824
2825 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2826
2827 platform_device_unregister(the_udc_pdev[i]);
2828 platform_device_unregister(the_hcd_pdev[i]);
2829 kfree(dum);
2830 }
2831 platform_driver_unregister(&dummy_udc_driver);
2832 platform_driver_unregister(&dummy_hcd_driver);
2833 }
2834 module_exit(cleanup);
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