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spi: spi-fsl-qspi: Fix return value check of devm_ioremap() in probe
[linux/fpc-iii.git] / drivers / usb / gadget / udc / dummy_hcd.c
blob6e3e3ebf715f040dd253f1486217fbe6e5a7e61f
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
4 *
5 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
6 *
7 * Copyright (C) 2003 David Brownell
8 * Copyright (C) 2003-2005 Alan Stern
9 */
10
11
12 /*
13 * This exposes a device side "USB gadget" API, driven by requests to a
14 * Linux-USB host controller driver. USB traffic is simulated; there's
15 * no need for USB hardware. Use this with two other drivers:
16 *
17 * - Gadget driver, responding to requests (slave);
18 * - Host-side device driver, as already familiar in Linux.
19 *
20 * Having this all in one kernel can help some stages of development,
21 * bypassing some hardware (and driver) issues. UML could help too.
22 *
23 * Note: The emulation does not include isochronous transfers!
24 */
25
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/init.h>
33 #include <linux/timer.h>
34 #include <linux/list.h>
35 #include <linux/interrupt.h>
36 #include <linux/platform_device.h>
37 #include <linux/usb.h>
38 #include <linux/usb/gadget.h>
39 #include <linux/usb/hcd.h>
40 #include <linux/scatterlist.h>
41
42 #include <asm/byteorder.h>
43 #include <linux/io.h>
44 #include <asm/irq.h>
45 #include <asm/unaligned.h>
46
47 #define DRIVER_DESC "USB Host+Gadget Emulator"
48 #define DRIVER_VERSION "02 May 2005"
49
50 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
51 #define POWER_BUDGET_3 900 /* in mA */
52
53 static const char driver_name[] = "dummy_hcd";
54 static const char driver_desc[] = "USB Host+Gadget Emulator";
55
56 static const char gadget_name[] = "dummy_udc";
57
58 MODULE_DESCRIPTION(DRIVER_DESC);
59 MODULE_AUTHOR("David Brownell");
60 MODULE_LICENSE("GPL");
61
62 struct dummy_hcd_module_parameters {
63 bool is_super_speed;
64 bool is_high_speed;
65 unsigned int num;
66 };
67
68 static struct dummy_hcd_module_parameters mod_data = {
69 .is_super_speed = false,
70 .is_high_speed = true,
71 .num = 1,
72 };
73 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
74 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
75 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
76 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
77 module_param_named(num, mod_data.num, uint, S_IRUGO);
78 MODULE_PARM_DESC(num, "number of emulated controllers");
79 /*-------------------------------------------------------------------------*/
80
81 /* gadget side driver data structres */
82 struct dummy_ep {
83 struct list_head queue;
84 unsigned long last_io; /* jiffies timestamp */
85 struct usb_gadget *gadget;
86 const struct usb_endpoint_descriptor *desc;
87 struct usb_ep ep;
88 unsigned halted:1;
89 unsigned wedged:1;
90 unsigned already_seen:1;
91 unsigned setup_stage:1;
92 unsigned stream_en:1;
93 };
94
95 struct dummy_request {
96 struct list_head queue; /* ep's requests */
97 struct usb_request req;
98 };
99
100 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
101 {
102 return container_of(_ep, struct dummy_ep, ep);
103 }
104
105 static inline struct dummy_request *usb_request_to_dummy_request
106 (struct usb_request *_req)
107 {
108 return container_of(_req, struct dummy_request, req);
109 }
110
111 /*-------------------------------------------------------------------------*/
112
113 /*
114 * Every device has ep0 for control requests, plus up to 30 more endpoints,
115 * in one of two types:
116 *
117 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
118 * number can be changed. Names like "ep-a" are used for this type.
119 *
120 * - Fixed Function: in other cases. some characteristics may be mutable;
121 * that'd be hardware-specific. Names like "ep12out-bulk" are used.
122 *
123 * Gadget drivers are responsible for not setting up conflicting endpoint
124 * configurations, illegal or unsupported packet lengths, and so on.
125 */
126
127 static const char ep0name[] = "ep0";
128
129 static const struct {
130 const char *name;
131 const struct usb_ep_caps caps;
132 } ep_info[] = {
133 #define EP_INFO(_name, _caps) \
134 { \
135 .name = _name, \
136 .caps = _caps, \
137 }
138
139 /* we don't provide isochronous endpoints since we don't support them */
140 #define TYPE_BULK_OR_INT (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT)
141
142 /* everyone has ep0 */
143 EP_INFO(ep0name,
144 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
145 /* act like a pxa250: fifteen fixed function endpoints */
146 EP_INFO("ep1in-bulk",
147 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
148 EP_INFO("ep2out-bulk",
149 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
150 /*
151 EP_INFO("ep3in-iso",
152 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
153 EP_INFO("ep4out-iso",
154 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
155 */
156 EP_INFO("ep5in-int",
157 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
158 EP_INFO("ep6in-bulk",
159 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
160 EP_INFO("ep7out-bulk",
161 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
162 /*
163 EP_INFO("ep8in-iso",
164 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
165 EP_INFO("ep9out-iso",
166 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
167 */
168 EP_INFO("ep10in-int",
169 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
170 EP_INFO("ep11in-bulk",
171 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
172 EP_INFO("ep12out-bulk",
173 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
174 /*
175 EP_INFO("ep13in-iso",
176 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
177 EP_INFO("ep14out-iso",
178 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
179 */
180 EP_INFO("ep15in-int",
181 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
182
183 /* or like sa1100: two fixed function endpoints */
184 EP_INFO("ep1out-bulk",
185 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
186 EP_INFO("ep2in-bulk",
187 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
188
189 /* and now some generic EPs so we have enough in multi config */
190 EP_INFO("ep3out",
191 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
192 EP_INFO("ep4in",
193 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
194 EP_INFO("ep5out",
195 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
196 EP_INFO("ep6out",
197 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
198 EP_INFO("ep7in",
199 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
200 EP_INFO("ep8out",
201 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
202 EP_INFO("ep9in",
203 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
204 EP_INFO("ep10out",
205 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
206 EP_INFO("ep11out",
207 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
208 EP_INFO("ep12in",
209 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
210 EP_INFO("ep13out",
211 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
212 EP_INFO("ep14in",
213 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
214 EP_INFO("ep15out",
215 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
216
217 #undef EP_INFO
218 };
219
220 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info)
221
222 /*-------------------------------------------------------------------------*/
223
224 #define FIFO_SIZE 64
225
226 struct urbp {
227 struct urb *urb;
228 struct list_head urbp_list;
229 struct sg_mapping_iter miter;
230 u32 miter_started;
231 };
232
233
234 enum dummy_rh_state {
235 DUMMY_RH_RESET,
236 DUMMY_RH_SUSPENDED,
237 DUMMY_RH_RUNNING
238 };
239
240 struct dummy_hcd {
241 struct dummy *dum;
242 enum dummy_rh_state rh_state;
243 struct timer_list timer;
244 u32 port_status;
245 u32 old_status;
246 unsigned long re_timeout;
247
248 struct usb_device *udev;
249 struct list_head urbp_list;
250 struct urbp *next_frame_urbp;
251
252 u32 stream_en_ep;
253 u8 num_stream[30 / 2];
254
255 unsigned active:1;
256 unsigned old_active:1;
257 unsigned resuming:1;
258 };
259
260 struct dummy {
261 spinlock_t lock;
262
263 /*
264 * SLAVE/GADGET side support
265 */
266 struct dummy_ep ep[DUMMY_ENDPOINTS];
267 int address;
268 int callback_usage;
269 struct usb_gadget gadget;
270 struct usb_gadget_driver *driver;
271 struct dummy_request fifo_req;
272 u8 fifo_buf[FIFO_SIZE];
273 u16 devstatus;
274 unsigned ints_enabled:1;
275 unsigned udc_suspended:1;
276 unsigned pullup:1;
277
278 /*
279 * MASTER/HOST side support
280 */
281 struct dummy_hcd *hs_hcd;
282 struct dummy_hcd *ss_hcd;
283 };
284
285 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
286 {
287 return (struct dummy_hcd *) (hcd->hcd_priv);
288 }
289
290 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
291 {
292 return container_of((void *) dum, struct usb_hcd, hcd_priv);
293 }
294
295 static inline struct device *dummy_dev(struct dummy_hcd *dum)
296 {
297 return dummy_hcd_to_hcd(dum)->self.controller;
298 }
299
300 static inline struct device *udc_dev(struct dummy *dum)
301 {
302 return dum->gadget.dev.parent;
303 }
304
305 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
306 {
307 return container_of(ep->gadget, struct dummy, gadget);
308 }
309
310 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
311 {
312 struct dummy *dum = container_of(gadget, struct dummy, gadget);
313 if (dum->gadget.speed == USB_SPEED_SUPER)
314 return dum->ss_hcd;
315 else
316 return dum->hs_hcd;
317 }
318
319 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
320 {
321 return container_of(dev, struct dummy, gadget.dev);
322 }
323
324 /*-------------------------------------------------------------------------*/
325
326 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
327
328 /* called with spinlock held */
329 static void nuke(struct dummy *dum, struct dummy_ep *ep)
330 {
331 while (!list_empty(&ep->queue)) {
332 struct dummy_request *req;
333
334 req = list_entry(ep->queue.next, struct dummy_request, queue);
335 list_del_init(&req->queue);
336 req->req.status = -ESHUTDOWN;
337
338 spin_unlock(&dum->lock);
339 usb_gadget_giveback_request(&ep->ep, &req->req);
340 spin_lock(&dum->lock);
341 }
342 }
343
344 /* caller must hold lock */
345 static void stop_activity(struct dummy *dum)
346 {
347 int i;
348
349 /* prevent any more requests */
350 dum->address = 0;
351
352 /* The timer is left running so that outstanding URBs can fail */
353
354 /* nuke any pending requests first, so driver i/o is quiesced */
355 for (i = 0; i < DUMMY_ENDPOINTS; ++i)
356 nuke(dum, &dum->ep[i]);
357
358 /* driver now does any non-usb quiescing necessary */
359 }
360
361 /**
362 * set_link_state_by_speed() - Sets the current state of the link according to
363 * the hcd speed
364 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
365 *
366 * This function updates the port_status according to the link state and the
367 * speed of the hcd.
368 */
369 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
370 {
371 struct dummy *dum = dum_hcd->dum;
372
373 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
374 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
375 dum_hcd->port_status = 0;
376 } else if (!dum->pullup || dum->udc_suspended) {
377 /* UDC suspend must cause a disconnect */
378 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
379 USB_PORT_STAT_ENABLE);
380 if ((dum_hcd->old_status &
381 USB_PORT_STAT_CONNECTION) != 0)
382 dum_hcd->port_status |=
383 (USB_PORT_STAT_C_CONNECTION << 16);
384 } else {
385 /* device is connected and not suspended */
386 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
387 USB_PORT_STAT_SPEED_5GBPS) ;
388 if ((dum_hcd->old_status &
389 USB_PORT_STAT_CONNECTION) == 0)
390 dum_hcd->port_status |=
391 (USB_PORT_STAT_C_CONNECTION << 16);
392 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) &&
393 (dum_hcd->port_status &
394 USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 &&
395 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
396 dum_hcd->active = 1;
397 }
398 } else {
399 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
400 dum_hcd->port_status = 0;
401 } else if (!dum->pullup || dum->udc_suspended) {
402 /* UDC suspend must cause a disconnect */
403 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
404 USB_PORT_STAT_ENABLE |
405 USB_PORT_STAT_LOW_SPEED |
406 USB_PORT_STAT_HIGH_SPEED |
407 USB_PORT_STAT_SUSPEND);
408 if ((dum_hcd->old_status &
409 USB_PORT_STAT_CONNECTION) != 0)
410 dum_hcd->port_status |=
411 (USB_PORT_STAT_C_CONNECTION << 16);
412 } else {
413 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
414 if ((dum_hcd->old_status &
415 USB_PORT_STAT_CONNECTION) == 0)
416 dum_hcd->port_status |=
417 (USB_PORT_STAT_C_CONNECTION << 16);
418 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
419 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
420 else if ((dum_hcd->port_status &
421 USB_PORT_STAT_SUSPEND) == 0 &&
422 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
423 dum_hcd->active = 1;
424 }
425 }
426 }
427
428 /* caller must hold lock */
429 static void set_link_state(struct dummy_hcd *dum_hcd)
430 {
431 struct dummy *dum = dum_hcd->dum;
432 unsigned int power_bit;
433
434 dum_hcd->active = 0;
435 if (dum->pullup)
436 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
437 dum->gadget.speed != USB_SPEED_SUPER) ||
438 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
439 dum->gadget.speed == USB_SPEED_SUPER))
440 return;
441
442 set_link_state_by_speed(dum_hcd);
443 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ?
444 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER);
445
446 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
447 dum_hcd->active)
448 dum_hcd->resuming = 0;
449
450 /* Currently !connected or in reset */
451 if ((dum_hcd->port_status & power_bit) == 0 ||
452 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
453 unsigned int disconnect = power_bit &
454 dum_hcd->old_status & (~dum_hcd->port_status);
455 unsigned int reset = USB_PORT_STAT_RESET &
456 (~dum_hcd->old_status) & dum_hcd->port_status;
457
458 /* Report reset and disconnect events to the driver */
459 if (dum->ints_enabled && (disconnect || reset)) {
460 stop_activity(dum);
461 ++dum->callback_usage;
462 spin_unlock(&dum->lock);
463 if (reset)
464 usb_gadget_udc_reset(&dum->gadget, dum->driver);
465 else
466 dum->driver->disconnect(&dum->gadget);
467 spin_lock(&dum->lock);
468 --dum->callback_usage;
469 }
470 } else if (dum_hcd->active != dum_hcd->old_active &&
471 dum->ints_enabled) {
472 ++dum->callback_usage;
473 spin_unlock(&dum->lock);
474 if (dum_hcd->old_active && dum->driver->suspend)
475 dum->driver->suspend(&dum->gadget);
476 else if (!dum_hcd->old_active && dum->driver->resume)
477 dum->driver->resume(&dum->gadget);
478 spin_lock(&dum->lock);
479 --dum->callback_usage;
480 }
481
482 dum_hcd->old_status = dum_hcd->port_status;
483 dum_hcd->old_active = dum_hcd->active;
484 }
485
486 /*-------------------------------------------------------------------------*/
487
488 /* SLAVE/GADGET SIDE DRIVER
489 *
490 * This only tracks gadget state. All the work is done when the host
491 * side tries some (emulated) i/o operation. Real device controller
492 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
493 */
494
495 #define is_enabled(dum) \
496 (dum->port_status & USB_PORT_STAT_ENABLE)
497
498 static int dummy_enable(struct usb_ep *_ep,
499 const struct usb_endpoint_descriptor *desc)
500 {
501 struct dummy *dum;
502 struct dummy_hcd *dum_hcd;
503 struct dummy_ep *ep;
504 unsigned max;
505 int retval;
506
507 ep = usb_ep_to_dummy_ep(_ep);
508 if (!_ep || !desc || ep->desc || _ep->name == ep0name
509 || desc->bDescriptorType != USB_DT_ENDPOINT)
510 return -EINVAL;
511 dum = ep_to_dummy(ep);
512 if (!dum->driver)
513 return -ESHUTDOWN;
514
515 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
516 if (!is_enabled(dum_hcd))
517 return -ESHUTDOWN;
518
519 /*
520 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
521 * maximum packet size.
522 * For SS devices the wMaxPacketSize is limited by 1024.
523 */
524 max = usb_endpoint_maxp(desc);
525
526 /* drivers must not request bad settings, since lower levels
527 * (hardware or its drivers) may not check. some endpoints
528 * can't do iso, many have maxpacket limitations, etc.
529 *
530 * since this "hardware" driver is here to help debugging, we
531 * have some extra sanity checks. (there could be more though,
532 * especially for "ep9out" style fixed function ones.)
533 */
534 retval = -EINVAL;
535 switch (usb_endpoint_type(desc)) {
536 case USB_ENDPOINT_XFER_BULK:
537 if (strstr(ep->ep.name, "-iso")
538 || strstr(ep->ep.name, "-int")) {
539 goto done;
540 }
541 switch (dum->gadget.speed) {
542 case USB_SPEED_SUPER:
543 if (max == 1024)
544 break;
545 goto done;
546 case USB_SPEED_HIGH:
547 if (max == 512)
548 break;
549 goto done;
550 case USB_SPEED_FULL:
551 if (max == 8 || max == 16 || max == 32 || max == 64)
552 /* we'll fake any legal size */
553 break;
554 /* save a return statement */
555 default:
556 goto done;
557 }
558 break;
559 case USB_ENDPOINT_XFER_INT:
560 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
561 goto done;
562 /* real hardware might not handle all packet sizes */
563 switch (dum->gadget.speed) {
564 case USB_SPEED_SUPER:
565 case USB_SPEED_HIGH:
566 if (max <= 1024)
567 break;
568 /* save a return statement */
569 /* fall through */
570 case USB_SPEED_FULL:
571 if (max <= 64)
572 break;
573 /* save a return statement */
574 /* fall through */
575 default:
576 if (max <= 8)
577 break;
578 goto done;
579 }
580 break;
581 case USB_ENDPOINT_XFER_ISOC:
582 if (strstr(ep->ep.name, "-bulk")
583 || strstr(ep->ep.name, "-int"))
584 goto done;
585 /* real hardware might not handle all packet sizes */
586 switch (dum->gadget.speed) {
587 case USB_SPEED_SUPER:
588 case USB_SPEED_HIGH:
589 if (max <= 1024)
590 break;
591 /* save a return statement */
592 /* fall through */
593 case USB_SPEED_FULL:
594 if (max <= 1023)
595 break;
596 /* save a return statement */
597 default:
598 goto done;
599 }
600 break;
601 default:
602 /* few chips support control except on ep0 */
603 goto done;
604 }
605
606 _ep->maxpacket = max;
607 if (usb_ss_max_streams(_ep->comp_desc)) {
608 if (!usb_endpoint_xfer_bulk(desc)) {
609 dev_err(udc_dev(dum), "Can't enable stream support on "
610 "non-bulk ep %s\n", _ep->name);
611 return -EINVAL;
612 }
613 ep->stream_en = 1;
614 }
615 ep->desc = desc;
616
617 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
618 _ep->name,
619 desc->bEndpointAddress & 0x0f,
620 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
621 usb_ep_type_string(usb_endpoint_type(desc)),
622 max, ep->stream_en ? "enabled" : "disabled");
623
624 /* at this point real hardware should be NAKing transfers
625 * to that endpoint, until a buffer is queued to it.
626 */
627 ep->halted = ep->wedged = 0;
628 retval = 0;
629 done:
630 return retval;
631 }
632
633 static int dummy_disable(struct usb_ep *_ep)
634 {
635 struct dummy_ep *ep;
636 struct dummy *dum;
637 unsigned long flags;
638
639 ep = usb_ep_to_dummy_ep(_ep);
640 if (!_ep || !ep->desc || _ep->name == ep0name)
641 return -EINVAL;
642 dum = ep_to_dummy(ep);
643
644 spin_lock_irqsave(&dum->lock, flags);
645 ep->desc = NULL;
646 ep->stream_en = 0;
647 nuke(dum, ep);
648 spin_unlock_irqrestore(&dum->lock, flags);
649
650 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
651 return 0;
652 }
653
654 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
655 gfp_t mem_flags)
656 {
657 struct dummy_request *req;
658
659 if (!_ep)
660 return NULL;
661
662 req = kzalloc(sizeof(*req), mem_flags);
663 if (!req)
664 return NULL;
665 INIT_LIST_HEAD(&req->queue);
666 return &req->req;
667 }
668
669 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
670 {
671 struct dummy_request *req;
672
673 if (!_ep || !_req) {
674 WARN_ON(1);
675 return;
676 }
677
678 req = usb_request_to_dummy_request(_req);
679 WARN_ON(!list_empty(&req->queue));
680 kfree(req);
681 }
682
683 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
684 {
685 }
686
687 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
688 gfp_t mem_flags)
689 {
690 struct dummy_ep *ep;
691 struct dummy_request *req;
692 struct dummy *dum;
693 struct dummy_hcd *dum_hcd;
694 unsigned long flags;
695
696 req = usb_request_to_dummy_request(_req);
697 if (!_req || !list_empty(&req->queue) || !_req->complete)
698 return -EINVAL;
699
700 ep = usb_ep_to_dummy_ep(_ep);
701 if (!_ep || (!ep->desc && _ep->name != ep0name))
702 return -EINVAL;
703
704 dum = ep_to_dummy(ep);
705 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
706 if (!dum->driver || !is_enabled(dum_hcd))
707 return -ESHUTDOWN;
708
709 #if 0
710 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
711 ep, _req, _ep->name, _req->length, _req->buf);
712 #endif
713 _req->status = -EINPROGRESS;
714 _req->actual = 0;
715 spin_lock_irqsave(&dum->lock, flags);
716
717 /* implement an emulated single-request FIFO */
718 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
719 list_empty(&dum->fifo_req.queue) &&
720 list_empty(&ep->queue) &&
721 _req->length <= FIFO_SIZE) {
722 req = &dum->fifo_req;
723 req->req = *_req;
724 req->req.buf = dum->fifo_buf;
725 memcpy(dum->fifo_buf, _req->buf, _req->length);
726 req->req.context = dum;
727 req->req.complete = fifo_complete;
728
729 list_add_tail(&req->queue, &ep->queue);
730 spin_unlock(&dum->lock);
731 _req->actual = _req->length;
732 _req->status = 0;
733 usb_gadget_giveback_request(_ep, _req);
734 spin_lock(&dum->lock);
735 } else
736 list_add_tail(&req->queue, &ep->queue);
737 spin_unlock_irqrestore(&dum->lock, flags);
738
739 /* real hardware would likely enable transfers here, in case
740 * it'd been left NAKing.
741 */
742 return 0;
743 }
744
745 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
746 {
747 struct dummy_ep *ep;
748 struct dummy *dum;
749 int retval = -EINVAL;
750 unsigned long flags;
751 struct dummy_request *req = NULL;
752
753 if (!_ep || !_req)
754 return retval;
755 ep = usb_ep_to_dummy_ep(_ep);
756 dum = ep_to_dummy(ep);
757
758 if (!dum->driver)
759 return -ESHUTDOWN;
760
761 local_irq_save(flags);
762 spin_lock(&dum->lock);
763 list_for_each_entry(req, &ep->queue, queue) {
764 if (&req->req == _req) {
765 list_del_init(&req->queue);
766 _req->status = -ECONNRESET;
767 retval = 0;
768 break;
769 }
770 }
771 spin_unlock(&dum->lock);
772
773 if (retval == 0) {
774 dev_dbg(udc_dev(dum),
775 "dequeued req %p from %s, len %d buf %p\n",
776 req, _ep->name, _req->length, _req->buf);
777 usb_gadget_giveback_request(_ep, _req);
778 }
779 local_irq_restore(flags);
780 return retval;
781 }
782
783 static int
784 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
785 {
786 struct dummy_ep *ep;
787 struct dummy *dum;
788
789 if (!_ep)
790 return -EINVAL;
791 ep = usb_ep_to_dummy_ep(_ep);
792 dum = ep_to_dummy(ep);
793 if (!dum->driver)
794 return -ESHUTDOWN;
795 if (!value)
796 ep->halted = ep->wedged = 0;
797 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
798 !list_empty(&ep->queue))
799 return -EAGAIN;
800 else {
801 ep->halted = 1;
802 if (wedged)
803 ep->wedged = 1;
804 }
805 /* FIXME clear emulated data toggle too */
806 return 0;
807 }
808
809 static int
810 dummy_set_halt(struct usb_ep *_ep, int value)
811 {
812 return dummy_set_halt_and_wedge(_ep, value, 0);
813 }
814
815 static int dummy_set_wedge(struct usb_ep *_ep)
816 {
817 if (!_ep || _ep->name == ep0name)
818 return -EINVAL;
819 return dummy_set_halt_and_wedge(_ep, 1, 1);
820 }
821
822 static const struct usb_ep_ops dummy_ep_ops = {
823 .enable = dummy_enable,
824 .disable = dummy_disable,
825
826 .alloc_request = dummy_alloc_request,
827 .free_request = dummy_free_request,
828
829 .queue = dummy_queue,
830 .dequeue = dummy_dequeue,
831
832 .set_halt = dummy_set_halt,
833 .set_wedge = dummy_set_wedge,
834 };
835
836 /*-------------------------------------------------------------------------*/
837
838 /* there are both host and device side versions of this call ... */
839 static int dummy_g_get_frame(struct usb_gadget *_gadget)
840 {
841 struct timespec64 ts64;
842
843 ktime_get_ts64(&ts64);
844 return ts64.tv_nsec / NSEC_PER_MSEC;
845 }
846
847 static int dummy_wakeup(struct usb_gadget *_gadget)
848 {
849 struct dummy_hcd *dum_hcd;
850
851 dum_hcd = gadget_to_dummy_hcd(_gadget);
852 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
853 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
854 return -EINVAL;
855 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
856 return -ENOLINK;
857 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
858 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
859 return -EIO;
860
861 /* FIXME: What if the root hub is suspended but the port isn't? */
862
863 /* hub notices our request, issues downstream resume, etc */
864 dum_hcd->resuming = 1;
865 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
866 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
867 return 0;
868 }
869
870 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
871 {
872 struct dummy *dum;
873
874 _gadget->is_selfpowered = (value != 0);
875 dum = gadget_to_dummy_hcd(_gadget)->dum;
876 if (value)
877 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
878 else
879 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
880 return 0;
881 }
882
883 static void dummy_udc_update_ep0(struct dummy *dum)
884 {
885 if (dum->gadget.speed == USB_SPEED_SUPER)
886 dum->ep[0].ep.maxpacket = 9;
887 else
888 dum->ep[0].ep.maxpacket = 64;
889 }
890
891 static int dummy_pullup(struct usb_gadget *_gadget, int value)
892 {
893 struct dummy_hcd *dum_hcd;
894 struct dummy *dum;
895 unsigned long flags;
896
897 dum = gadget_dev_to_dummy(&_gadget->dev);
898 dum_hcd = gadget_to_dummy_hcd(_gadget);
899
900 spin_lock_irqsave(&dum->lock, flags);
901 dum->pullup = (value != 0);
902 set_link_state(dum_hcd);
903 spin_unlock_irqrestore(&dum->lock, flags);
904
905 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
906 return 0;
907 }
908
909 static void dummy_udc_set_speed(struct usb_gadget *_gadget,
910 enum usb_device_speed speed)
911 {
912 struct dummy *dum;
913
914 dum = gadget_dev_to_dummy(&_gadget->dev);
915 dum->gadget.speed = speed;
916 dummy_udc_update_ep0(dum);
917 }
918
919 static int dummy_udc_start(struct usb_gadget *g,
920 struct usb_gadget_driver *driver);
921 static int dummy_udc_stop(struct usb_gadget *g);
922
923 static const struct usb_gadget_ops dummy_ops = {
924 .get_frame = dummy_g_get_frame,
925 .wakeup = dummy_wakeup,
926 .set_selfpowered = dummy_set_selfpowered,
927 .pullup = dummy_pullup,
928 .udc_start = dummy_udc_start,
929 .udc_stop = dummy_udc_stop,
930 .udc_set_speed = dummy_udc_set_speed,
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 switch (g->speed) {
970 /* All the speeds we support */
971 case USB_SPEED_LOW:
972 case USB_SPEED_FULL:
973 case USB_SPEED_HIGH:
974 case USB_SPEED_SUPER:
975 break;
976 default:
977 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n",
978 driver->max_speed);
979 return -EINVAL;
980 }
981
982 /*
983 * SLAVE side init ... the layer above hardware, which
984 * can't enumerate without help from the driver we're binding.
985 */
986
987 spin_lock_irq(&dum->lock);
988 dum->devstatus = 0;
989 dum->driver = driver;
990 dum->ints_enabled = 1;
991 spin_unlock_irq(&dum->lock);
992
993 return 0;
994 }
995
996 static int dummy_udc_stop(struct usb_gadget *g)
997 {
998 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
999 struct dummy *dum = dum_hcd->dum;
1000
1001 spin_lock_irq(&dum->lock);
1002 dum->ints_enabled = 0;
1003 stop_activity(dum);
1004
1005 /* emulate synchronize_irq(): wait for callbacks to finish */
1006 while (dum->callback_usage > 0) {
1007 spin_unlock_irq(&dum->lock);
1008 usleep_range(1000, 2000);
1009 spin_lock_irq(&dum->lock);
1010 }
1011
1012 dum->driver = NULL;
1013 spin_unlock_irq(&dum->lock);
1014
1015 return 0;
1016 }
1017
1018 #undef is_enabled
1019
1020 /* The gadget structure is stored inside the hcd structure and will be
1021 * released along with it. */
1022 static void init_dummy_udc_hw(struct dummy *dum)
1023 {
1024 int i;
1025
1026 INIT_LIST_HEAD(&dum->gadget.ep_list);
1027 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1028 struct dummy_ep *ep = &dum->ep[i];
1029
1030 if (!ep_info[i].name)
1031 break;
1032 ep->ep.name = ep_info[i].name;
1033 ep->ep.caps = ep_info[i].caps;
1034 ep->ep.ops = &dummy_ep_ops;
1035 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1036 ep->halted = ep->wedged = ep->already_seen =
1037 ep->setup_stage = 0;
1038 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1039 ep->ep.max_streams = 16;
1040 ep->last_io = jiffies;
1041 ep->gadget = &dum->gadget;
1042 ep->desc = NULL;
1043 INIT_LIST_HEAD(&ep->queue);
1044 }
1045
1046 dum->gadget.ep0 = &dum->ep[0].ep;
1047 list_del_init(&dum->ep[0].ep.ep_list);
1048 INIT_LIST_HEAD(&dum->fifo_req.queue);
1049
1050 #ifdef CONFIG_USB_OTG
1051 dum->gadget.is_otg = 1;
1052 #endif
1053 }
1054
1055 static int dummy_udc_probe(struct platform_device *pdev)
1056 {
1057 struct dummy *dum;
1058 int rc;
1059
1060 dum = *((void **)dev_get_platdata(&pdev->dev));
1061 /* Clear usb_gadget region for new registration to udc-core */
1062 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1063 dum->gadget.name = gadget_name;
1064 dum->gadget.ops = &dummy_ops;
1065 if (mod_data.is_super_speed)
1066 dum->gadget.max_speed = USB_SPEED_SUPER;
1067 else if (mod_data.is_high_speed)
1068 dum->gadget.max_speed = USB_SPEED_HIGH;
1069 else
1070 dum->gadget.max_speed = USB_SPEED_FULL;
1071
1072 dum->gadget.dev.parent = &pdev->dev;
1073 init_dummy_udc_hw(dum);
1074
1075 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1076 if (rc < 0)
1077 goto err_udc;
1078
1079 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1080 if (rc < 0)
1081 goto err_dev;
1082 platform_set_drvdata(pdev, dum);
1083 return rc;
1084
1085 err_dev:
1086 usb_del_gadget_udc(&dum->gadget);
1087 err_udc:
1088 return rc;
1089 }
1090
1091 static int dummy_udc_remove(struct platform_device *pdev)
1092 {
1093 struct dummy *dum = platform_get_drvdata(pdev);
1094
1095 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1096 usb_del_gadget_udc(&dum->gadget);
1097 return 0;
1098 }
1099
1100 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1101 int suspend)
1102 {
1103 spin_lock_irq(&dum->lock);
1104 dum->udc_suspended = suspend;
1105 set_link_state(dum_hcd);
1106 spin_unlock_irq(&dum->lock);
1107 }
1108
1109 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1110 {
1111 struct dummy *dum = platform_get_drvdata(pdev);
1112 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1113
1114 dev_dbg(&pdev->dev, "%s\n", __func__);
1115 dummy_udc_pm(dum, dum_hcd, 1);
1116 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1117 return 0;
1118 }
1119
1120 static int dummy_udc_resume(struct platform_device *pdev)
1121 {
1122 struct dummy *dum = platform_get_drvdata(pdev);
1123 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1124
1125 dev_dbg(&pdev->dev, "%s\n", __func__);
1126 dummy_udc_pm(dum, dum_hcd, 0);
1127 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1128 return 0;
1129 }
1130
1131 static struct platform_driver dummy_udc_driver = {
1132 .probe = dummy_udc_probe,
1133 .remove = dummy_udc_remove,
1134 .suspend = dummy_udc_suspend,
1135 .resume = dummy_udc_resume,
1136 .driver = {
1137 .name = gadget_name,
1138 },
1139 };
1140
1141 /*-------------------------------------------------------------------------*/
1142
1143 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1144 {
1145 unsigned int index;
1146
1147 index = usb_endpoint_num(desc) << 1;
1148 if (usb_endpoint_dir_in(desc))
1149 index |= 1;
1150 return index;
1151 }
1152
1153 /* MASTER/HOST SIDE DRIVER
1154 *
1155 * this uses the hcd framework to hook up to host side drivers.
1156 * its root hub will only have one device, otherwise it acts like
1157 * a normal host controller.
1158 *
1159 * when urbs are queued, they're just stuck on a list that we
1160 * scan in a timer callback. that callback connects writes from
1161 * the host with reads from the device, and so on, based on the
1162 * usb 2.0 rules.
1163 */
1164
1165 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1166 {
1167 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1168 u32 index;
1169
1170 if (!usb_endpoint_xfer_bulk(desc))
1171 return 0;
1172
1173 index = dummy_get_ep_idx(desc);
1174 return (1 << index) & dum_hcd->stream_en_ep;
1175 }
1176
1177 /*
1178 * The max stream number is saved as a nibble so for the 30 possible endpoints
1179 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1180 * means we use only 1 stream). The maximum according to the spec is 16bit so
1181 * if the 16 stream limit is about to go, the array size should be incremented
1182 * to 30 elements of type u16.
1183 */
1184 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1185 unsigned int pipe)
1186 {
1187 int max_streams;
1188
1189 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1190 if (usb_pipeout(pipe))
1191 max_streams >>= 4;
1192 else
1193 max_streams &= 0xf;
1194 max_streams++;
1195 return max_streams;
1196 }
1197
1198 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1199 unsigned int pipe, unsigned int streams)
1200 {
1201 int max_streams;
1202
1203 streams--;
1204 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1205 if (usb_pipeout(pipe)) {
1206 streams <<= 4;
1207 max_streams &= 0xf;
1208 } else {
1209 max_streams &= 0xf0;
1210 }
1211 max_streams |= streams;
1212 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1213 }
1214
1215 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1216 {
1217 unsigned int max_streams;
1218 int enabled;
1219
1220 enabled = dummy_ep_stream_en(dum_hcd, urb);
1221 if (!urb->stream_id) {
1222 if (enabled)
1223 return -EINVAL;
1224 return 0;
1225 }
1226 if (!enabled)
1227 return -EINVAL;
1228
1229 max_streams = get_max_streams_for_pipe(dum_hcd,
1230 usb_pipeendpoint(urb->pipe));
1231 if (urb->stream_id > max_streams) {
1232 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1233 urb->stream_id);
1234 BUG();
1235 return -EINVAL;
1236 }
1237 return 0;
1238 }
1239
1240 static int dummy_urb_enqueue(
1241 struct usb_hcd *hcd,
1242 struct urb *urb,
1243 gfp_t mem_flags
1244 ) {
1245 struct dummy_hcd *dum_hcd;
1246 struct urbp *urbp;
1247 unsigned long flags;
1248 int rc;
1249
1250 urbp = kmalloc(sizeof *urbp, mem_flags);
1251 if (!urbp)
1252 return -ENOMEM;
1253 urbp->urb = urb;
1254 urbp->miter_started = 0;
1255
1256 dum_hcd = hcd_to_dummy_hcd(hcd);
1257 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1258
1259 rc = dummy_validate_stream(dum_hcd, urb);
1260 if (rc) {
1261 kfree(urbp);
1262 goto done;
1263 }
1264
1265 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1266 if (rc) {
1267 kfree(urbp);
1268 goto done;
1269 }
1270
1271 if (!dum_hcd->udev) {
1272 dum_hcd->udev = urb->dev;
1273 usb_get_dev(dum_hcd->udev);
1274 } else if (unlikely(dum_hcd->udev != urb->dev))
1275 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1276
1277 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1278 urb->hcpriv = urbp;
1279 if (!dum_hcd->next_frame_urbp)
1280 dum_hcd->next_frame_urbp = urbp;
1281 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1282 urb->error_count = 1; /* mark as a new urb */
1283
1284 /* kick the scheduler, it'll do the rest */
1285 if (!timer_pending(&dum_hcd->timer))
1286 mod_timer(&dum_hcd->timer, jiffies + 1);
1287
1288 done:
1289 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1290 return rc;
1291 }
1292
1293 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1294 {
1295 struct dummy_hcd *dum_hcd;
1296 unsigned long flags;
1297 int rc;
1298
1299 /* giveback happens automatically in timer callback,
1300 * so make sure the callback happens */
1301 dum_hcd = hcd_to_dummy_hcd(hcd);
1302 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1303
1304 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1305 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1306 !list_empty(&dum_hcd->urbp_list))
1307 mod_timer(&dum_hcd->timer, jiffies);
1308
1309 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1310 return rc;
1311 }
1312
1313 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1314 u32 len)
1315 {
1316 void *ubuf, *rbuf;
1317 struct urbp *urbp = urb->hcpriv;
1318 int to_host;
1319 struct sg_mapping_iter *miter = &urbp->miter;
1320 u32 trans = 0;
1321 u32 this_sg;
1322 bool next_sg;
1323
1324 to_host = usb_urb_dir_in(urb);
1325 rbuf = req->req.buf + req->req.actual;
1326
1327 if (!urb->num_sgs) {
1328 ubuf = urb->transfer_buffer + urb->actual_length;
1329 if (to_host)
1330 memcpy(ubuf, rbuf, len);
1331 else
1332 memcpy(rbuf, ubuf, len);
1333 return len;
1334 }
1335
1336 if (!urbp->miter_started) {
1337 u32 flags = SG_MITER_ATOMIC;
1338
1339 if (to_host)
1340 flags |= SG_MITER_TO_SG;
1341 else
1342 flags |= SG_MITER_FROM_SG;
1343
1344 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1345 urbp->miter_started = 1;
1346 }
1347 next_sg = sg_miter_next(miter);
1348 if (next_sg == false) {
1349 WARN_ON_ONCE(1);
1350 return -EINVAL;
1351 }
1352 do {
1353 ubuf = miter->addr;
1354 this_sg = min_t(u32, len, miter->length);
1355 miter->consumed = this_sg;
1356 trans += this_sg;
1357
1358 if (to_host)
1359 memcpy(ubuf, rbuf, this_sg);
1360 else
1361 memcpy(rbuf, ubuf, this_sg);
1362 len -= this_sg;
1363
1364 if (!len)
1365 break;
1366 next_sg = sg_miter_next(miter);
1367 if (next_sg == false) {
1368 WARN_ON_ONCE(1);
1369 return -EINVAL;
1370 }
1371
1372 rbuf += this_sg;
1373 } while (1);
1374
1375 sg_miter_stop(miter);
1376 return trans;
1377 }
1378
1379 /* transfer up to a frame's worth; caller must own lock */
1380 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1381 struct dummy_ep *ep, int limit, int *status)
1382 {
1383 struct dummy *dum = dum_hcd->dum;
1384 struct dummy_request *req;
1385 int sent = 0;
1386
1387 top:
1388 /* if there's no request queued, the device is NAKing; return */
1389 list_for_each_entry(req, &ep->queue, queue) {
1390 unsigned host_len, dev_len, len;
1391 int is_short, to_host;
1392 int rescan = 0;
1393
1394 if (dummy_ep_stream_en(dum_hcd, urb)) {
1395 if ((urb->stream_id != req->req.stream_id))
1396 continue;
1397 }
1398
1399 /* 1..N packets of ep->ep.maxpacket each ... the last one
1400 * may be short (including zero length).
1401 *
1402 * writer can send a zlp explicitly (length 0) or implicitly
1403 * (length mod maxpacket zero, and 'zero' flag); they always
1404 * terminate reads.
1405 */
1406 host_len = urb->transfer_buffer_length - urb->actual_length;
1407 dev_len = req->req.length - req->req.actual;
1408 len = min(host_len, dev_len);
1409
1410 /* FIXME update emulated data toggle too */
1411
1412 to_host = usb_urb_dir_in(urb);
1413 if (unlikely(len == 0))
1414 is_short = 1;
1415 else {
1416 /* not enough bandwidth left? */
1417 if (limit < ep->ep.maxpacket && limit < len)
1418 break;
1419 len = min_t(unsigned, len, limit);
1420 if (len == 0)
1421 break;
1422
1423 /* send multiple of maxpacket first, then remainder */
1424 if (len >= ep->ep.maxpacket) {
1425 is_short = 0;
1426 if (len % ep->ep.maxpacket)
1427 rescan = 1;
1428 len -= len % ep->ep.maxpacket;
1429 } else {
1430 is_short = 1;
1431 }
1432
1433 len = dummy_perform_transfer(urb, req, len);
1434
1435 ep->last_io = jiffies;
1436 if ((int)len < 0) {
1437 req->req.status = len;
1438 } else {
1439 limit -= len;
1440 sent += len;
1441 urb->actual_length += len;
1442 req->req.actual += len;
1443 }
1444 }
1445
1446 /* short packets terminate, maybe with overflow/underflow.
1447 * it's only really an error to write too much.
1448 *
1449 * partially filling a buffer optionally blocks queue advances
1450 * (so completion handlers can clean up the queue) but we don't
1451 * need to emulate such data-in-flight.
1452 */
1453 if (is_short) {
1454 if (host_len == dev_len) {
1455 req->req.status = 0;
1456 *status = 0;
1457 } else if (to_host) {
1458 req->req.status = 0;
1459 if (dev_len > host_len)
1460 *status = -EOVERFLOW;
1461 else
1462 *status = 0;
1463 } else {
1464 *status = 0;
1465 if (host_len > dev_len)
1466 req->req.status = -EOVERFLOW;
1467 else
1468 req->req.status = 0;
1469 }
1470
1471 /*
1472 * many requests terminate without a short packet.
1473 * send a zlp if demanded by flags.
1474 */
1475 } else {
1476 if (req->req.length == req->req.actual) {
1477 if (req->req.zero && to_host)
1478 rescan = 1;
1479 else
1480 req->req.status = 0;
1481 }
1482 if (urb->transfer_buffer_length == urb->actual_length) {
1483 if (urb->transfer_flags & URB_ZERO_PACKET &&
1484 !to_host)
1485 rescan = 1;
1486 else
1487 *status = 0;
1488 }
1489 }
1490
1491 /* device side completion --> continuable */
1492 if (req->req.status != -EINPROGRESS) {
1493 list_del_init(&req->queue);
1494
1495 spin_unlock(&dum->lock);
1496 usb_gadget_giveback_request(&ep->ep, &req->req);
1497 spin_lock(&dum->lock);
1498
1499 /* requests might have been unlinked... */
1500 rescan = 1;
1501 }
1502
1503 /* host side completion --> terminate */
1504 if (*status != -EINPROGRESS)
1505 break;
1506
1507 /* rescan to continue with any other queued i/o */
1508 if (rescan)
1509 goto top;
1510 }
1511 return sent;
1512 }
1513
1514 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1515 {
1516 int limit = ep->ep.maxpacket;
1517
1518 if (dum->gadget.speed == USB_SPEED_HIGH) {
1519 int tmp;
1520
1521 /* high bandwidth mode */
1522 tmp = usb_endpoint_maxp_mult(ep->desc);
1523 tmp *= 8 /* applies to entire frame */;
1524 limit += limit * tmp;
1525 }
1526 if (dum->gadget.speed == USB_SPEED_SUPER) {
1527 switch (usb_endpoint_type(ep->desc)) {
1528 case USB_ENDPOINT_XFER_ISOC:
1529 /* Sec. 4.4.8.2 USB3.0 Spec */
1530 limit = 3 * 16 * 1024 * 8;
1531 break;
1532 case USB_ENDPOINT_XFER_INT:
1533 /* Sec. 4.4.7.2 USB3.0 Spec */
1534 limit = 3 * 1024 * 8;
1535 break;
1536 case USB_ENDPOINT_XFER_BULK:
1537 default:
1538 break;
1539 }
1540 }
1541 return limit;
1542 }
1543
1544 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1545 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1546 USB_PORT_STAT_SUSPEND)) \
1547 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1548
1549 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1550 {
1551 int i;
1552
1553 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1554 dum->ss_hcd : dum->hs_hcd)))
1555 return NULL;
1556 if (!dum->ints_enabled)
1557 return NULL;
1558 if ((address & ~USB_DIR_IN) == 0)
1559 return &dum->ep[0];
1560 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1561 struct dummy_ep *ep = &dum->ep[i];
1562
1563 if (!ep->desc)
1564 continue;
1565 if (ep->desc->bEndpointAddress == address)
1566 return ep;
1567 }
1568 return NULL;
1569 }
1570
1571 #undef is_active
1572
1573 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1574 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1575 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1576 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1577 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1578 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1579
1580
1581 /**
1582 * handle_control_request() - handles all control transfers
1583 * @dum: pointer to dummy (the_controller)
1584 * @urb: the urb request to handle
1585 * @setup: pointer to the setup data for a USB device control
1586 * request
1587 * @status: pointer to request handling status
1588 *
1589 * Return 0 - if the request was handled
1590 * 1 - if the request wasn't handles
1591 * error code on error
1592 */
1593 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1594 struct usb_ctrlrequest *setup,
1595 int *status)
1596 {
1597 struct dummy_ep *ep2;
1598 struct dummy *dum = dum_hcd->dum;
1599 int ret_val = 1;
1600 unsigned w_index;
1601 unsigned w_value;
1602
1603 w_index = le16_to_cpu(setup->wIndex);
1604 w_value = le16_to_cpu(setup->wValue);
1605 switch (setup->bRequest) {
1606 case USB_REQ_SET_ADDRESS:
1607 if (setup->bRequestType != Dev_Request)
1608 break;
1609 dum->address = w_value;
1610 *status = 0;
1611 dev_dbg(udc_dev(dum), "set_address = %d\n",
1612 w_value);
1613 ret_val = 0;
1614 break;
1615 case USB_REQ_SET_FEATURE:
1616 if (setup->bRequestType == Dev_Request) {
1617 ret_val = 0;
1618 switch (w_value) {
1619 case USB_DEVICE_REMOTE_WAKEUP:
1620 break;
1621 case USB_DEVICE_B_HNP_ENABLE:
1622 dum->gadget.b_hnp_enable = 1;
1623 break;
1624 case USB_DEVICE_A_HNP_SUPPORT:
1625 dum->gadget.a_hnp_support = 1;
1626 break;
1627 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1628 dum->gadget.a_alt_hnp_support = 1;
1629 break;
1630 case USB_DEVICE_U1_ENABLE:
1631 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1632 HCD_USB3)
1633 w_value = USB_DEV_STAT_U1_ENABLED;
1634 else
1635 ret_val = -EOPNOTSUPP;
1636 break;
1637 case USB_DEVICE_U2_ENABLE:
1638 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1639 HCD_USB3)
1640 w_value = USB_DEV_STAT_U2_ENABLED;
1641 else
1642 ret_val = -EOPNOTSUPP;
1643 break;
1644 case USB_DEVICE_LTM_ENABLE:
1645 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1646 HCD_USB3)
1647 w_value = USB_DEV_STAT_LTM_ENABLED;
1648 else
1649 ret_val = -EOPNOTSUPP;
1650 break;
1651 default:
1652 ret_val = -EOPNOTSUPP;
1653 }
1654 if (ret_val == 0) {
1655 dum->devstatus |= (1 << w_value);
1656 *status = 0;
1657 }
1658 } else if (setup->bRequestType == Ep_Request) {
1659 /* endpoint halt */
1660 ep2 = find_endpoint(dum, w_index);
1661 if (!ep2 || ep2->ep.name == ep0name) {
1662 ret_val = -EOPNOTSUPP;
1663 break;
1664 }
1665 ep2->halted = 1;
1666 ret_val = 0;
1667 *status = 0;
1668 }
1669 break;
1670 case USB_REQ_CLEAR_FEATURE:
1671 if (setup->bRequestType == Dev_Request) {
1672 ret_val = 0;
1673 switch (w_value) {
1674 case USB_DEVICE_REMOTE_WAKEUP:
1675 w_value = USB_DEVICE_REMOTE_WAKEUP;
1676 break;
1677 case USB_DEVICE_U1_ENABLE:
1678 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1679 HCD_USB3)
1680 w_value = USB_DEV_STAT_U1_ENABLED;
1681 else
1682 ret_val = -EOPNOTSUPP;
1683 break;
1684 case USB_DEVICE_U2_ENABLE:
1685 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1686 HCD_USB3)
1687 w_value = USB_DEV_STAT_U2_ENABLED;
1688 else
1689 ret_val = -EOPNOTSUPP;
1690 break;
1691 case USB_DEVICE_LTM_ENABLE:
1692 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1693 HCD_USB3)
1694 w_value = USB_DEV_STAT_LTM_ENABLED;
1695 else
1696 ret_val = -EOPNOTSUPP;
1697 break;
1698 default:
1699 ret_val = -EOPNOTSUPP;
1700 break;
1701 }
1702 if (ret_val == 0) {
1703 dum->devstatus &= ~(1 << w_value);
1704 *status = 0;
1705 }
1706 } else if (setup->bRequestType == Ep_Request) {
1707 /* endpoint halt */
1708 ep2 = find_endpoint(dum, w_index);
1709 if (!ep2) {
1710 ret_val = -EOPNOTSUPP;
1711 break;
1712 }
1713 if (!ep2->wedged)
1714 ep2->halted = 0;
1715 ret_val = 0;
1716 *status = 0;
1717 }
1718 break;
1719 case USB_REQ_GET_STATUS:
1720 if (setup->bRequestType == Dev_InRequest
1721 || setup->bRequestType == Intf_InRequest
1722 || setup->bRequestType == Ep_InRequest) {
1723 char *buf;
1724 /*
1725 * device: remote wakeup, selfpowered
1726 * interface: nothing
1727 * endpoint: halt
1728 */
1729 buf = (char *)urb->transfer_buffer;
1730 if (urb->transfer_buffer_length > 0) {
1731 if (setup->bRequestType == Ep_InRequest) {
1732 ep2 = find_endpoint(dum, w_index);
1733 if (!ep2) {
1734 ret_val = -EOPNOTSUPP;
1735 break;
1736 }
1737 buf[0] = ep2->halted;
1738 } else if (setup->bRequestType ==
1739 Dev_InRequest) {
1740 buf[0] = (u8)dum->devstatus;
1741 } else
1742 buf[0] = 0;
1743 }
1744 if (urb->transfer_buffer_length > 1)
1745 buf[1] = 0;
1746 urb->actual_length = min_t(u32, 2,
1747 urb->transfer_buffer_length);
1748 ret_val = 0;
1749 *status = 0;
1750 }
1751 break;
1752 }
1753 return ret_val;
1754 }
1755
1756 /* drive both sides of the transfers; looks like irq handlers to
1757 * both drivers except the callbacks aren't in_irq().
1758 */
1759 static void dummy_timer(struct timer_list *t)
1760 {
1761 struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer);
1762 struct dummy *dum = dum_hcd->dum;
1763 struct urbp *urbp, *tmp;
1764 unsigned long flags;
1765 int limit, total;
1766 int i;
1767
1768 /* simplistic model for one frame's bandwidth */
1769 /* FIXME: account for transaction and packet overhead */
1770 switch (dum->gadget.speed) {
1771 case USB_SPEED_LOW:
1772 total = 8/*bytes*/ * 12/*packets*/;
1773 break;
1774 case USB_SPEED_FULL:
1775 total = 64/*bytes*/ * 19/*packets*/;
1776 break;
1777 case USB_SPEED_HIGH:
1778 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1779 break;
1780 case USB_SPEED_SUPER:
1781 /* Bus speed is 500000 bytes/ms, so use a little less */
1782 total = 490000;
1783 break;
1784 default: /* Can't happen */
1785 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1786 total = 0;
1787 break;
1788 }
1789
1790 /* FIXME if HZ != 1000 this will probably misbehave ... */
1791
1792 /* look at each urb queued by the host side driver */
1793 spin_lock_irqsave(&dum->lock, flags);
1794
1795 if (!dum_hcd->udev) {
1796 dev_err(dummy_dev(dum_hcd),
1797 "timer fired with no URBs pending?\n");
1798 spin_unlock_irqrestore(&dum->lock, flags);
1799 return;
1800 }
1801 dum_hcd->next_frame_urbp = NULL;
1802
1803 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1804 if (!ep_info[i].name)
1805 break;
1806 dum->ep[i].already_seen = 0;
1807 }
1808
1809 restart:
1810 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1811 struct urb *urb;
1812 struct dummy_request *req;
1813 u8 address;
1814 struct dummy_ep *ep = NULL;
1815 int status = -EINPROGRESS;
1816
1817 /* stop when we reach URBs queued after the timer interrupt */
1818 if (urbp == dum_hcd->next_frame_urbp)
1819 break;
1820
1821 urb = urbp->urb;
1822 if (urb->unlinked)
1823 goto return_urb;
1824 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1825 continue;
1826
1827 /* Used up this frame's bandwidth? */
1828 if (total <= 0)
1829 continue;
1830
1831 /* find the gadget's ep for this request (if configured) */
1832 address = usb_pipeendpoint (urb->pipe);
1833 if (usb_urb_dir_in(urb))
1834 address |= USB_DIR_IN;
1835 ep = find_endpoint(dum, address);
1836 if (!ep) {
1837 /* set_configuration() disagreement */
1838 dev_dbg(dummy_dev(dum_hcd),
1839 "no ep configured for urb %p\n",
1840 urb);
1841 status = -EPROTO;
1842 goto return_urb;
1843 }
1844
1845 if (ep->already_seen)
1846 continue;
1847 ep->already_seen = 1;
1848 if (ep == &dum->ep[0] && urb->error_count) {
1849 ep->setup_stage = 1; /* a new urb */
1850 urb->error_count = 0;
1851 }
1852 if (ep->halted && !ep->setup_stage) {
1853 /* NOTE: must not be iso! */
1854 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1855 ep->ep.name, urb);
1856 status = -EPIPE;
1857 goto return_urb;
1858 }
1859 /* FIXME make sure both ends agree on maxpacket */
1860
1861 /* handle control requests */
1862 if (ep == &dum->ep[0] && ep->setup_stage) {
1863 struct usb_ctrlrequest setup;
1864 int value = 1;
1865
1866 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1867 /* paranoia, in case of stale queued data */
1868 list_for_each_entry(req, &ep->queue, queue) {
1869 list_del_init(&req->queue);
1870 req->req.status = -EOVERFLOW;
1871 dev_dbg(udc_dev(dum), "stale req = %p\n",
1872 req);
1873
1874 spin_unlock(&dum->lock);
1875 usb_gadget_giveback_request(&ep->ep, &req->req);
1876 spin_lock(&dum->lock);
1877 ep->already_seen = 0;
1878 goto restart;
1879 }
1880
1881 /* gadget driver never sees set_address or operations
1882 * on standard feature flags. some hardware doesn't
1883 * even expose them.
1884 */
1885 ep->last_io = jiffies;
1886 ep->setup_stage = 0;
1887 ep->halted = 0;
1888
1889 value = handle_control_request(dum_hcd, urb, &setup,
1890 &status);
1891
1892 /* gadget driver handles all other requests. block
1893 * until setup() returns; no reentrancy issues etc.
1894 */
1895 if (value > 0) {
1896 ++dum->callback_usage;
1897 spin_unlock(&dum->lock);
1898 value = dum->driver->setup(&dum->gadget,
1899 &setup);
1900 spin_lock(&dum->lock);
1901 --dum->callback_usage;
1902
1903 if (value >= 0) {
1904 /* no delays (max 64KB data stage) */
1905 limit = 64*1024;
1906 goto treat_control_like_bulk;
1907 }
1908 /* error, see below */
1909 }
1910
1911 if (value < 0) {
1912 if (value != -EOPNOTSUPP)
1913 dev_dbg(udc_dev(dum),
1914 "setup --> %d\n",
1915 value);
1916 status = -EPIPE;
1917 urb->actual_length = 0;
1918 }
1919
1920 goto return_urb;
1921 }
1922
1923 /* non-control requests */
1924 limit = total;
1925 switch (usb_pipetype(urb->pipe)) {
1926 case PIPE_ISOCHRONOUS:
1927 /*
1928 * We don't support isochronous. But if we did,
1929 * here are some of the issues we'd have to face:
1930 *
1931 * Is it urb->interval since the last xfer?
1932 * Use urb->iso_frame_desc[i].
1933 * Complete whether or not ep has requests queued.
1934 * Report random errors, to debug drivers.
1935 */
1936 limit = max(limit, periodic_bytes(dum, ep));
1937 status = -EINVAL; /* fail all xfers */
1938 break;
1939
1940 case PIPE_INTERRUPT:
1941 /* FIXME is it urb->interval since the last xfer?
1942 * this almost certainly polls too fast.
1943 */
1944 limit = max(limit, periodic_bytes(dum, ep));
1945 /* FALLTHROUGH */
1946
1947 default:
1948 treat_control_like_bulk:
1949 ep->last_io = jiffies;
1950 total -= transfer(dum_hcd, urb, ep, limit, &status);
1951 break;
1952 }
1953
1954 /* incomplete transfer? */
1955 if (status == -EINPROGRESS)
1956 continue;
1957
1958 return_urb:
1959 list_del(&urbp->urbp_list);
1960 kfree(urbp);
1961 if (ep)
1962 ep->already_seen = ep->setup_stage = 0;
1963
1964 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1965 spin_unlock(&dum->lock);
1966 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1967 spin_lock(&dum->lock);
1968
1969 goto restart;
1970 }
1971
1972 if (list_empty(&dum_hcd->urbp_list)) {
1973 usb_put_dev(dum_hcd->udev);
1974 dum_hcd->udev = NULL;
1975 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1976 /* want a 1 msec delay here */
1977 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1978 }
1979
1980 spin_unlock_irqrestore(&dum->lock, flags);
1981 }
1982
1983 /*-------------------------------------------------------------------------*/
1984
1985 #define PORT_C_MASK \
1986 ((USB_PORT_STAT_C_CONNECTION \
1987 | USB_PORT_STAT_C_ENABLE \
1988 | USB_PORT_STAT_C_SUSPEND \
1989 | USB_PORT_STAT_C_OVERCURRENT \
1990 | USB_PORT_STAT_C_RESET) << 16)
1991
1992 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1993 {
1994 struct dummy_hcd *dum_hcd;
1995 unsigned long flags;
1996 int retval = 0;
1997
1998 dum_hcd = hcd_to_dummy_hcd(hcd);
1999
2000 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2001 if (!HCD_HW_ACCESSIBLE(hcd))
2002 goto done;
2003
2004 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2005 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2006 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2007 set_link_state(dum_hcd);
2008 }
2009
2010 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2011 *buf = (1 << 1);
2012 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2013 dum_hcd->port_status);
2014 retval = 1;
2015 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2016 usb_hcd_resume_root_hub(hcd);
2017 }
2018 done:
2019 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2020 return retval;
2021 }
2022
2023 /* usb 3.0 root hub device descriptor */
2024 static struct {
2025 struct usb_bos_descriptor bos;
2026 struct usb_ss_cap_descriptor ss_cap;
2027 } __packed usb3_bos_desc = {
2028
2029 .bos = {
2030 .bLength = USB_DT_BOS_SIZE,
2031 .bDescriptorType = USB_DT_BOS,
2032 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
2033 .bNumDeviceCaps = 1,
2034 },
2035 .ss_cap = {
2036 .bLength = USB_DT_USB_SS_CAP_SIZE,
2037 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
2038 .bDevCapabilityType = USB_SS_CAP_TYPE,
2039 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
2040 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
2041 },
2042 };
2043
2044 static inline void
2045 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2046 {
2047 memset(desc, 0, sizeof *desc);
2048 desc->bDescriptorType = USB_DT_SS_HUB;
2049 desc->bDescLength = 12;
2050 desc->wHubCharacteristics = cpu_to_le16(
2051 HUB_CHAR_INDV_PORT_LPSM |
2052 HUB_CHAR_COMMON_OCPM);
2053 desc->bNbrPorts = 1;
2054 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2055 desc->u.ss.DeviceRemovable = 0;
2056 }
2057
2058 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2059 {
2060 memset(desc, 0, sizeof *desc);
2061 desc->bDescriptorType = USB_DT_HUB;
2062 desc->bDescLength = 9;
2063 desc->wHubCharacteristics = cpu_to_le16(
2064 HUB_CHAR_INDV_PORT_LPSM |
2065 HUB_CHAR_COMMON_OCPM);
2066 desc->bNbrPorts = 1;
2067 desc->u.hs.DeviceRemovable[0] = 0;
2068 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */
2069 }
2070
2071 static int dummy_hub_control(
2072 struct usb_hcd *hcd,
2073 u16 typeReq,
2074 u16 wValue,
2075 u16 wIndex,
2076 char *buf,
2077 u16 wLength
2078 ) {
2079 struct dummy_hcd *dum_hcd;
2080 int retval = 0;
2081 unsigned long flags;
2082
2083 if (!HCD_HW_ACCESSIBLE(hcd))
2084 return -ETIMEDOUT;
2085
2086 dum_hcd = hcd_to_dummy_hcd(hcd);
2087
2088 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2089 switch (typeReq) {
2090 case ClearHubFeature:
2091 break;
2092 case ClearPortFeature:
2093 switch (wValue) {
2094 case USB_PORT_FEAT_SUSPEND:
2095 if (hcd->speed == HCD_USB3) {
2096 dev_dbg(dummy_dev(dum_hcd),
2097 "USB_PORT_FEAT_SUSPEND req not "
2098 "supported for USB 3.0 roothub\n");
2099 goto error;
2100 }
2101 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2102 /* 20msec resume signaling */
2103 dum_hcd->resuming = 1;
2104 dum_hcd->re_timeout = jiffies +
2105 msecs_to_jiffies(20);
2106 }
2107 break;
2108 case USB_PORT_FEAT_POWER:
2109 dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2110 if (hcd->speed == HCD_USB3)
2111 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2112 else
2113 dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2114 set_link_state(dum_hcd);
2115 break;
2116 default:
2117 dum_hcd->port_status &= ~(1 << wValue);
2118 set_link_state(dum_hcd);
2119 }
2120 break;
2121 case GetHubDescriptor:
2122 if (hcd->speed == HCD_USB3 &&
2123 (wLength < USB_DT_SS_HUB_SIZE ||
2124 wValue != (USB_DT_SS_HUB << 8))) {
2125 dev_dbg(dummy_dev(dum_hcd),
2126 "Wrong hub descriptor type for "
2127 "USB 3.0 roothub.\n");
2128 goto error;
2129 }
2130 if (hcd->speed == HCD_USB3)
2131 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2132 else
2133 hub_descriptor((struct usb_hub_descriptor *) buf);
2134 break;
2135
2136 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2137 if (hcd->speed != HCD_USB3)
2138 goto error;
2139
2140 if ((wValue >> 8) != USB_DT_BOS)
2141 goto error;
2142
2143 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2144 retval = sizeof(usb3_bos_desc);
2145 break;
2146
2147 case GetHubStatus:
2148 *(__le32 *) buf = cpu_to_le32(0);
2149 break;
2150 case GetPortStatus:
2151 if (wIndex != 1)
2152 retval = -EPIPE;
2153
2154 /* whoever resets or resumes must GetPortStatus to
2155 * complete it!!
2156 */
2157 if (dum_hcd->resuming &&
2158 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2159 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2160 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2161 }
2162 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2163 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2164 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2165 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2166 if (dum_hcd->dum->pullup) {
2167 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2168
2169 if (hcd->speed < HCD_USB3) {
2170 switch (dum_hcd->dum->gadget.speed) {
2171 case USB_SPEED_HIGH:
2172 dum_hcd->port_status |=
2173 USB_PORT_STAT_HIGH_SPEED;
2174 break;
2175 case USB_SPEED_LOW:
2176 dum_hcd->dum->gadget.ep0->
2177 maxpacket = 8;
2178 dum_hcd->port_status |=
2179 USB_PORT_STAT_LOW_SPEED;
2180 break;
2181 default:
2182 break;
2183 }
2184 }
2185 }
2186 }
2187 set_link_state(dum_hcd);
2188 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2189 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2190 break;
2191 case SetHubFeature:
2192 retval = -EPIPE;
2193 break;
2194 case SetPortFeature:
2195 switch (wValue) {
2196 case USB_PORT_FEAT_LINK_STATE:
2197 if (hcd->speed != HCD_USB3) {
2198 dev_dbg(dummy_dev(dum_hcd),
2199 "USB_PORT_FEAT_LINK_STATE req not "
2200 "supported for USB 2.0 roothub\n");
2201 goto error;
2202 }
2203 /*
2204 * Since this is dummy we don't have an actual link so
2205 * there is nothing to do for the SET_LINK_STATE cmd
2206 */
2207 break;
2208 case USB_PORT_FEAT_U1_TIMEOUT:
2209 case USB_PORT_FEAT_U2_TIMEOUT:
2210 /* TODO: add suspend/resume support! */
2211 if (hcd->speed != HCD_USB3) {
2212 dev_dbg(dummy_dev(dum_hcd),
2213 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2214 "supported for USB 2.0 roothub\n");
2215 goto error;
2216 }
2217 break;
2218 case USB_PORT_FEAT_SUSPEND:
2219 /* Applicable only for USB2.0 hub */
2220 if (hcd->speed == HCD_USB3) {
2221 dev_dbg(dummy_dev(dum_hcd),
2222 "USB_PORT_FEAT_SUSPEND req not "
2223 "supported for USB 3.0 roothub\n");
2224 goto error;
2225 }
2226 if (dum_hcd->active) {
2227 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2228
2229 /* HNP would happen here; for now we
2230 * assume b_bus_req is always true.
2231 */
2232 set_link_state(dum_hcd);
2233 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2234 & dum_hcd->dum->devstatus) != 0)
2235 dev_dbg(dummy_dev(dum_hcd),
2236 "no HNP yet!\n");
2237 }
2238 break;
2239 case USB_PORT_FEAT_POWER:
2240 if (hcd->speed == HCD_USB3)
2241 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2242 else
2243 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2244 set_link_state(dum_hcd);
2245 break;
2246 case USB_PORT_FEAT_BH_PORT_RESET:
2247 /* Applicable only for USB3.0 hub */
2248 if (hcd->speed != HCD_USB3) {
2249 dev_dbg(dummy_dev(dum_hcd),
2250 "USB_PORT_FEAT_BH_PORT_RESET req not "
2251 "supported for USB 2.0 roothub\n");
2252 goto error;
2253 }
2254 /* FALLS THROUGH */
2255 case USB_PORT_FEAT_RESET:
2256 /* if it's already enabled, disable */
2257 if (hcd->speed == HCD_USB3) {
2258 dum_hcd->port_status = 0;
2259 dum_hcd->port_status =
2260 (USB_SS_PORT_STAT_POWER |
2261 USB_PORT_STAT_CONNECTION |
2262 USB_PORT_STAT_RESET);
2263 } else
2264 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2265 | USB_PORT_STAT_LOW_SPEED
2266 | USB_PORT_STAT_HIGH_SPEED);
2267 /*
2268 * We want to reset device status. All but the
2269 * Self powered feature
2270 */
2271 dum_hcd->dum->devstatus &=
2272 (1 << USB_DEVICE_SELF_POWERED);
2273 /*
2274 * FIXME USB3.0: what is the correct reset signaling
2275 * interval? Is it still 50msec as for HS?
2276 */
2277 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2278 /* FALLS THROUGH */
2279 default:
2280 if (hcd->speed == HCD_USB3) {
2281 if ((dum_hcd->port_status &
2282 USB_SS_PORT_STAT_POWER) != 0) {
2283 dum_hcd->port_status |= (1 << wValue);
2284 }
2285 } else
2286 if ((dum_hcd->port_status &
2287 USB_PORT_STAT_POWER) != 0) {
2288 dum_hcd->port_status |= (1 << wValue);
2289 }
2290 set_link_state(dum_hcd);
2291 }
2292 break;
2293 case GetPortErrorCount:
2294 if (hcd->speed != HCD_USB3) {
2295 dev_dbg(dummy_dev(dum_hcd),
2296 "GetPortErrorCount req not "
2297 "supported for USB 2.0 roothub\n");
2298 goto error;
2299 }
2300 /* We'll always return 0 since this is a dummy hub */
2301 *(__le32 *) buf = cpu_to_le32(0);
2302 break;
2303 case SetHubDepth:
2304 if (hcd->speed != HCD_USB3) {
2305 dev_dbg(dummy_dev(dum_hcd),
2306 "SetHubDepth req not supported for "
2307 "USB 2.0 roothub\n");
2308 goto error;
2309 }
2310 break;
2311 default:
2312 dev_dbg(dummy_dev(dum_hcd),
2313 "hub control req%04x v%04x i%04x l%d\n",
2314 typeReq, wValue, wIndex, wLength);
2315 error:
2316 /* "protocol stall" on error */
2317 retval = -EPIPE;
2318 }
2319 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2320
2321 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2322 usb_hcd_poll_rh_status(hcd);
2323 return retval;
2324 }
2325
2326 static int dummy_bus_suspend(struct usb_hcd *hcd)
2327 {
2328 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2329
2330 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2331
2332 spin_lock_irq(&dum_hcd->dum->lock);
2333 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2334 set_link_state(dum_hcd);
2335 hcd->state = HC_STATE_SUSPENDED;
2336 spin_unlock_irq(&dum_hcd->dum->lock);
2337 return 0;
2338 }
2339
2340 static int dummy_bus_resume(struct usb_hcd *hcd)
2341 {
2342 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2343 int rc = 0;
2344
2345 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2346
2347 spin_lock_irq(&dum_hcd->dum->lock);
2348 if (!HCD_HW_ACCESSIBLE(hcd)) {
2349 rc = -ESHUTDOWN;
2350 } else {
2351 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2352 set_link_state(dum_hcd);
2353 if (!list_empty(&dum_hcd->urbp_list))
2354 mod_timer(&dum_hcd->timer, jiffies);
2355 hcd->state = HC_STATE_RUNNING;
2356 }
2357 spin_unlock_irq(&dum_hcd->dum->lock);
2358 return rc;
2359 }
2360
2361 /*-------------------------------------------------------------------------*/
2362
2363 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2364 {
2365 int ep = usb_pipeendpoint(urb->pipe);
2366
2367 return scnprintf(buf, size,
2368 "urb/%p %s ep%d%s%s len %d/%d\n",
2369 urb,
2370 ({ char *s;
2371 switch (urb->dev->speed) {
2372 case USB_SPEED_LOW:
2373 s = "ls";
2374 break;
2375 case USB_SPEED_FULL:
2376 s = "fs";
2377 break;
2378 case USB_SPEED_HIGH:
2379 s = "hs";
2380 break;
2381 case USB_SPEED_SUPER:
2382 s = "ss";
2383 break;
2384 default:
2385 s = "?";
2386 break;
2387 } s; }),
2388 ep, ep ? (usb_urb_dir_in(urb) ? "in" : "out") : "",
2389 ({ char *s; \
2390 switch (usb_pipetype(urb->pipe)) { \
2391 case PIPE_CONTROL: \
2392 s = ""; \
2393 break; \
2394 case PIPE_BULK: \
2395 s = "-bulk"; \
2396 break; \
2397 case PIPE_INTERRUPT: \
2398 s = "-int"; \
2399 break; \
2400 default: \
2401 s = "-iso"; \
2402 break; \
2403 } s; }),
2404 urb->actual_length, urb->transfer_buffer_length);
2405 }
2406
2407 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2408 char *buf)
2409 {
2410 struct usb_hcd *hcd = dev_get_drvdata(dev);
2411 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2412 struct urbp *urbp;
2413 size_t size = 0;
2414 unsigned long flags;
2415
2416 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2417 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2418 size_t temp;
2419
2420 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2421 buf += temp;
2422 size += temp;
2423 }
2424 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2425
2426 return size;
2427 }
2428 static DEVICE_ATTR_RO(urbs);
2429
2430 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2431 {
2432 timer_setup(&dum_hcd->timer, dummy_timer, 0);
2433 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2434 dum_hcd->stream_en_ep = 0;
2435 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2436 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3;
2437 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2438 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2439 #ifdef CONFIG_USB_OTG
2440 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2441 #endif
2442 return 0;
2443
2444 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2445 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2446 }
2447
2448 static int dummy_start(struct usb_hcd *hcd)
2449 {
2450 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2451
2452 /*
2453 * MASTER side init ... we emulate a root hub that'll only ever
2454 * talk to one device (the slave side). Also appears in sysfs,
2455 * just like more familiar pci-based HCDs.
2456 */
2457 if (!usb_hcd_is_primary_hcd(hcd))
2458 return dummy_start_ss(dum_hcd);
2459
2460 spin_lock_init(&dum_hcd->dum->lock);
2461 timer_setup(&dum_hcd->timer, dummy_timer, 0);
2462 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2463
2464 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2465
2466 hcd->power_budget = POWER_BUDGET;
2467 hcd->state = HC_STATE_RUNNING;
2468 hcd->uses_new_polling = 1;
2469
2470 #ifdef CONFIG_USB_OTG
2471 hcd->self.otg_port = 1;
2472 #endif
2473
2474 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2475 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2476 }
2477
2478 static void dummy_stop(struct usb_hcd *hcd)
2479 {
2480 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2481 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2482 }
2483
2484 /*-------------------------------------------------------------------------*/
2485
2486 static int dummy_h_get_frame(struct usb_hcd *hcd)
2487 {
2488 return dummy_g_get_frame(NULL);
2489 }
2490
2491 static int dummy_setup(struct usb_hcd *hcd)
2492 {
2493 struct dummy *dum;
2494
2495 dum = *((void **)dev_get_platdata(hcd->self.controller));
2496 hcd->self.sg_tablesize = ~0;
2497 if (usb_hcd_is_primary_hcd(hcd)) {
2498 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2499 dum->hs_hcd->dum = dum;
2500 /*
2501 * Mark the first roothub as being USB 2.0.
2502 * The USB 3.0 roothub will be registered later by
2503 * dummy_hcd_probe()
2504 */
2505 hcd->speed = HCD_USB2;
2506 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2507 } else {
2508 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2509 dum->ss_hcd->dum = dum;
2510 hcd->speed = HCD_USB3;
2511 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2512 }
2513 return 0;
2514 }
2515
2516 /* Change a group of bulk endpoints to support multiple stream IDs */
2517 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2518 struct usb_host_endpoint **eps, unsigned int num_eps,
2519 unsigned int num_streams, gfp_t mem_flags)
2520 {
2521 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2522 unsigned long flags;
2523 int max_stream;
2524 int ret_streams = num_streams;
2525 unsigned int index;
2526 unsigned int i;
2527
2528 if (!num_eps)
2529 return -EINVAL;
2530
2531 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2532 for (i = 0; i < num_eps; i++) {
2533 index = dummy_get_ep_idx(&eps[i]->desc);
2534 if ((1 << index) & dum_hcd->stream_en_ep) {
2535 ret_streams = -EINVAL;
2536 goto out;
2537 }
2538 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2539 if (!max_stream) {
2540 ret_streams = -EINVAL;
2541 goto out;
2542 }
2543 if (max_stream < ret_streams) {
2544 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2545 "stream IDs.\n",
2546 eps[i]->desc.bEndpointAddress,
2547 max_stream);
2548 ret_streams = max_stream;
2549 }
2550 }
2551
2552 for (i = 0; i < num_eps; i++) {
2553 index = dummy_get_ep_idx(&eps[i]->desc);
2554 dum_hcd->stream_en_ep |= 1 << index;
2555 set_max_streams_for_pipe(dum_hcd,
2556 usb_endpoint_num(&eps[i]->desc), ret_streams);
2557 }
2558 out:
2559 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2560 return ret_streams;
2561 }
2562
2563 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2564 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2565 struct usb_host_endpoint **eps, unsigned int num_eps,
2566 gfp_t mem_flags)
2567 {
2568 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2569 unsigned long flags;
2570 int ret;
2571 unsigned int index;
2572 unsigned int i;
2573
2574 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2575 for (i = 0; i < num_eps; i++) {
2576 index = dummy_get_ep_idx(&eps[i]->desc);
2577 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2578 ret = -EINVAL;
2579 goto out;
2580 }
2581 }
2582
2583 for (i = 0; i < num_eps; i++) {
2584 index = dummy_get_ep_idx(&eps[i]->desc);
2585 dum_hcd->stream_en_ep &= ~(1 << index);
2586 set_max_streams_for_pipe(dum_hcd,
2587 usb_endpoint_num(&eps[i]->desc), 0);
2588 }
2589 ret = 0;
2590 out:
2591 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2592 return ret;
2593 }
2594
2595 static struct hc_driver dummy_hcd = {
2596 .description = (char *) driver_name,
2597 .product_desc = "Dummy host controller",
2598 .hcd_priv_size = sizeof(struct dummy_hcd),
2599
2600 .reset = dummy_setup,
2601 .start = dummy_start,
2602 .stop = dummy_stop,
2603
2604 .urb_enqueue = dummy_urb_enqueue,
2605 .urb_dequeue = dummy_urb_dequeue,
2606
2607 .get_frame_number = dummy_h_get_frame,
2608
2609 .hub_status_data = dummy_hub_status,
2610 .hub_control = dummy_hub_control,
2611 .bus_suspend = dummy_bus_suspend,
2612 .bus_resume = dummy_bus_resume,
2613
2614 .alloc_streams = dummy_alloc_streams,
2615 .free_streams = dummy_free_streams,
2616 };
2617
2618 static int dummy_hcd_probe(struct platform_device *pdev)
2619 {
2620 struct dummy *dum;
2621 struct usb_hcd *hs_hcd;
2622 struct usb_hcd *ss_hcd;
2623 int retval;
2624
2625 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2626 dum = *((void **)dev_get_platdata(&pdev->dev));
2627
2628 if (mod_data.is_super_speed)
2629 dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2630 else if (mod_data.is_high_speed)
2631 dummy_hcd.flags = HCD_USB2;
2632 else
2633 dummy_hcd.flags = HCD_USB11;
2634 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2635 if (!hs_hcd)
2636 return -ENOMEM;
2637 hs_hcd->has_tt = 1;
2638
2639 retval = usb_add_hcd(hs_hcd, 0, 0);
2640 if (retval)
2641 goto put_usb2_hcd;
2642
2643 if (mod_data.is_super_speed) {
2644 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2645 dev_name(&pdev->dev), hs_hcd);
2646 if (!ss_hcd) {
2647 retval = -ENOMEM;
2648 goto dealloc_usb2_hcd;
2649 }
2650
2651 retval = usb_add_hcd(ss_hcd, 0, 0);
2652 if (retval)
2653 goto put_usb3_hcd;
2654 }
2655 return 0;
2656
2657 put_usb3_hcd:
2658 usb_put_hcd(ss_hcd);
2659 dealloc_usb2_hcd:
2660 usb_remove_hcd(hs_hcd);
2661 put_usb2_hcd:
2662 usb_put_hcd(hs_hcd);
2663 dum->hs_hcd = dum->ss_hcd = NULL;
2664 return retval;
2665 }
2666
2667 static int dummy_hcd_remove(struct platform_device *pdev)
2668 {
2669 struct dummy *dum;
2670
2671 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2672
2673 if (dum->ss_hcd) {
2674 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2675 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2676 }
2677
2678 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2679 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2680
2681 dum->hs_hcd = NULL;
2682 dum->ss_hcd = NULL;
2683
2684 return 0;
2685 }
2686
2687 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2688 {
2689 struct usb_hcd *hcd;
2690 struct dummy_hcd *dum_hcd;
2691 int rc = 0;
2692
2693 dev_dbg(&pdev->dev, "%s\n", __func__);
2694
2695 hcd = platform_get_drvdata(pdev);
2696 dum_hcd = hcd_to_dummy_hcd(hcd);
2697 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2698 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2699 rc = -EBUSY;
2700 } else
2701 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2702 return rc;
2703 }
2704
2705 static int dummy_hcd_resume(struct platform_device *pdev)
2706 {
2707 struct usb_hcd *hcd;
2708
2709 dev_dbg(&pdev->dev, "%s\n", __func__);
2710
2711 hcd = platform_get_drvdata(pdev);
2712 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2713 usb_hcd_poll_rh_status(hcd);
2714 return 0;
2715 }
2716
2717 static struct platform_driver dummy_hcd_driver = {
2718 .probe = dummy_hcd_probe,
2719 .remove = dummy_hcd_remove,
2720 .suspend = dummy_hcd_suspend,
2721 .resume = dummy_hcd_resume,
2722 .driver = {
2723 .name = driver_name,
2724 },
2725 };
2726
2727 /*-------------------------------------------------------------------------*/
2728 #define MAX_NUM_UDC 32
2729 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2730 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2731
2732 static int __init init(void)
2733 {
2734 int retval = -ENOMEM;
2735 int i;
2736 struct dummy *dum[MAX_NUM_UDC];
2737
2738 if (usb_disabled())
2739 return -ENODEV;
2740
2741 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2742 return -EINVAL;
2743
2744 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2745 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2746 MAX_NUM_UDC);
2747 return -EINVAL;
2748 }
2749
2750 for (i = 0; i < mod_data.num; i++) {
2751 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2752 if (!the_hcd_pdev[i]) {
2753 i--;
2754 while (i >= 0)
2755 platform_device_put(the_hcd_pdev[i--]);
2756 return retval;
2757 }
2758 }
2759 for (i = 0; i < mod_data.num; i++) {
2760 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2761 if (!the_udc_pdev[i]) {
2762 i--;
2763 while (i >= 0)
2764 platform_device_put(the_udc_pdev[i--]);
2765 goto err_alloc_udc;
2766 }
2767 }
2768 for (i = 0; i < mod_data.num; i++) {
2769 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2770 if (!dum[i]) {
2771 retval = -ENOMEM;
2772 goto err_add_pdata;
2773 }
2774 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2775 sizeof(void *));
2776 if (retval)
2777 goto err_add_pdata;
2778 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2779 sizeof(void *));
2780 if (retval)
2781 goto err_add_pdata;
2782 }
2783
2784 retval = platform_driver_register(&dummy_hcd_driver);
2785 if (retval < 0)
2786 goto err_add_pdata;
2787 retval = platform_driver_register(&dummy_udc_driver);
2788 if (retval < 0)
2789 goto err_register_udc_driver;
2790
2791 for (i = 0; i < mod_data.num; i++) {
2792 retval = platform_device_add(the_hcd_pdev[i]);
2793 if (retval < 0) {
2794 i--;
2795 while (i >= 0)
2796 platform_device_del(the_hcd_pdev[i--]);
2797 goto err_add_hcd;
2798 }
2799 }
2800 for (i = 0; i < mod_data.num; i++) {
2801 if (!dum[i]->hs_hcd ||
2802 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2803 /*
2804 * The hcd was added successfully but its probe
2805 * function failed for some reason.
2806 */
2807 retval = -EINVAL;
2808 goto err_add_udc;
2809 }
2810 }
2811
2812 for (i = 0; i < mod_data.num; i++) {
2813 retval = platform_device_add(the_udc_pdev[i]);
2814 if (retval < 0) {
2815 i--;
2816 while (i >= 0)
2817 platform_device_del(the_udc_pdev[i--]);
2818 goto err_add_udc;
2819 }
2820 }
2821
2822 for (i = 0; i < mod_data.num; i++) {
2823 if (!platform_get_drvdata(the_udc_pdev[i])) {
2824 /*
2825 * The udc was added successfully but its probe
2826 * function failed for some reason.
2827 */
2828 retval = -EINVAL;
2829 goto err_probe_udc;
2830 }
2831 }
2832 return retval;
2833
2834 err_probe_udc:
2835 for (i = 0; i < mod_data.num; i++)
2836 platform_device_del(the_udc_pdev[i]);
2837 err_add_udc:
2838 for (i = 0; i < mod_data.num; i++)
2839 platform_device_del(the_hcd_pdev[i]);
2840 err_add_hcd:
2841 platform_driver_unregister(&dummy_udc_driver);
2842 err_register_udc_driver:
2843 platform_driver_unregister(&dummy_hcd_driver);
2844 err_add_pdata:
2845 for (i = 0; i < mod_data.num; i++)
2846 kfree(dum[i]);
2847 for (i = 0; i < mod_data.num; i++)
2848 platform_device_put(the_udc_pdev[i]);
2849 err_alloc_udc:
2850 for (i = 0; i < mod_data.num; i++)
2851 platform_device_put(the_hcd_pdev[i]);
2852 return retval;
2853 }
2854 module_init(init);
2855
2856 static void __exit cleanup(void)
2857 {
2858 int i;
2859
2860 for (i = 0; i < mod_data.num; i++) {
2861 struct dummy *dum;
2862
2863 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2864
2865 platform_device_unregister(the_udc_pdev[i]);
2866 platform_device_unregister(the_hcd_pdev[i]);
2867 kfree(dum);
2868 }
2869 platform_driver_unregister(&dummy_udc_driver);
2870 platform_driver_unregister(&dummy_hcd_driver);
2871 }
2872 module_exit(cleanup);
Linux with added FPC-III support