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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / gadget / udc / dummy_hcd.c
blobff4d6cac7ac0cde492a2a4355b6005ed9affb04b
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 struct urbp *next_frame_urbp;
241
242 u32 stream_en_ep;
243 u8 num_stream[30 / 2];
244
245 unsigned active:1;
246 unsigned old_active:1;
247 unsigned resuming:1;
248 };
249
250 struct dummy {
251 spinlock_t lock;
252
253 /*
254 * SLAVE/GADGET side support
255 */
256 struct dummy_ep ep[DUMMY_ENDPOINTS];
257 int address;
258 int callback_usage;
259 struct usb_gadget gadget;
260 struct usb_gadget_driver *driver;
261 struct dummy_request fifo_req;
262 u8 fifo_buf[FIFO_SIZE];
263 u16 devstatus;
264 unsigned ints_enabled:1;
265 unsigned udc_suspended:1;
266 unsigned pullup:1;
267
268 /*
269 * MASTER/HOST side support
270 */
271 struct dummy_hcd *hs_hcd;
272 struct dummy_hcd *ss_hcd;
273 };
274
275 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
276 {
277 return (struct dummy_hcd *) (hcd->hcd_priv);
278 }
279
280 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
281 {
282 return container_of((void *) dum, struct usb_hcd, hcd_priv);
283 }
284
285 static inline struct device *dummy_dev(struct dummy_hcd *dum)
286 {
287 return dummy_hcd_to_hcd(dum)->self.controller;
288 }
289
290 static inline struct device *udc_dev(struct dummy *dum)
291 {
292 return dum->gadget.dev.parent;
293 }
294
295 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
296 {
297 return container_of(ep->gadget, struct dummy, gadget);
298 }
299
300 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
301 {
302 struct dummy *dum = container_of(gadget, struct dummy, gadget);
303 if (dum->gadget.speed == USB_SPEED_SUPER)
304 return dum->ss_hcd;
305 else
306 return dum->hs_hcd;
307 }
308
309 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
310 {
311 return container_of(dev, struct dummy, gadget.dev);
312 }
313
314 /*-------------------------------------------------------------------------*/
315
316 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
317
318 /* called with spinlock held */
319 static void nuke(struct dummy *dum, struct dummy_ep *ep)
320 {
321 while (!list_empty(&ep->queue)) {
322 struct dummy_request *req;
323
324 req = list_entry(ep->queue.next, struct dummy_request, queue);
325 list_del_init(&req->queue);
326 req->req.status = -ESHUTDOWN;
327
328 spin_unlock(&dum->lock);
329 usb_gadget_giveback_request(&ep->ep, &req->req);
330 spin_lock(&dum->lock);
331 }
332 }
333
334 /* caller must hold lock */
335 static void stop_activity(struct dummy *dum)
336 {
337 int i;
338
339 /* prevent any more requests */
340 dum->address = 0;
341
342 /* The timer is left running so that outstanding URBs can fail */
343
344 /* nuke any pending requests first, so driver i/o is quiesced */
345 for (i = 0; i < DUMMY_ENDPOINTS; ++i)
346 nuke(dum, &dum->ep[i]);
347
348 /* driver now does any non-usb quiescing necessary */
349 }
350
351 /**
352 * set_link_state_by_speed() - Sets the current state of the link according to
353 * the hcd speed
354 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
355 *
356 * This function updates the port_status according to the link state and the
357 * speed of the hcd.
358 */
359 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
360 {
361 struct dummy *dum = dum_hcd->dum;
362
363 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
364 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
365 dum_hcd->port_status = 0;
366 } else if (!dum->pullup || dum->udc_suspended) {
367 /* UDC suspend must cause a disconnect */
368 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
369 USB_PORT_STAT_ENABLE);
370 if ((dum_hcd->old_status &
371 USB_PORT_STAT_CONNECTION) != 0)
372 dum_hcd->port_status |=
373 (USB_PORT_STAT_C_CONNECTION << 16);
374 } else {
375 /* device is connected and not suspended */
376 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
377 USB_PORT_STAT_SPEED_5GBPS) ;
378 if ((dum_hcd->old_status &
379 USB_PORT_STAT_CONNECTION) == 0)
380 dum_hcd->port_status |=
381 (USB_PORT_STAT_C_CONNECTION << 16);
382 if ((dum_hcd->port_status &
383 USB_PORT_STAT_ENABLE) == 1 &&
384 (dum_hcd->port_status &
385 USB_SS_PORT_LS_U0) == 1 &&
386 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
387 dum_hcd->active = 1;
388 }
389 } else {
390 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
391 dum_hcd->port_status = 0;
392 } else if (!dum->pullup || dum->udc_suspended) {
393 /* UDC suspend must cause a disconnect */
394 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
395 USB_PORT_STAT_ENABLE |
396 USB_PORT_STAT_LOW_SPEED |
397 USB_PORT_STAT_HIGH_SPEED |
398 USB_PORT_STAT_SUSPEND);
399 if ((dum_hcd->old_status &
400 USB_PORT_STAT_CONNECTION) != 0)
401 dum_hcd->port_status |=
402 (USB_PORT_STAT_C_CONNECTION << 16);
403 } else {
404 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
405 if ((dum_hcd->old_status &
406 USB_PORT_STAT_CONNECTION) == 0)
407 dum_hcd->port_status |=
408 (USB_PORT_STAT_C_CONNECTION << 16);
409 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
410 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
411 else if ((dum_hcd->port_status &
412 USB_PORT_STAT_SUSPEND) == 0 &&
413 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
414 dum_hcd->active = 1;
415 }
416 }
417 }
418
419 /* caller must hold lock */
420 static void set_link_state(struct dummy_hcd *dum_hcd)
421 {
422 struct dummy *dum = dum_hcd->dum;
423 unsigned int power_bit;
424
425 dum_hcd->active = 0;
426 if (dum->pullup)
427 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
428 dum->gadget.speed != USB_SPEED_SUPER) ||
429 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
430 dum->gadget.speed == USB_SPEED_SUPER))
431 return;
432
433 set_link_state_by_speed(dum_hcd);
434 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ?
435 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER);
436
437 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
438 dum_hcd->active)
439 dum_hcd->resuming = 0;
440
441 /* Currently !connected or in reset */
442 if ((dum_hcd->port_status & power_bit) == 0 ||
443 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
444 unsigned int disconnect = power_bit &
445 dum_hcd->old_status & (~dum_hcd->port_status);
446 unsigned int reset = USB_PORT_STAT_RESET &
447 (~dum_hcd->old_status) & dum_hcd->port_status;
448
449 /* Report reset and disconnect events to the driver */
450 if (dum->ints_enabled && (disconnect || reset)) {
451 stop_activity(dum);
452 ++dum->callback_usage;
453 spin_unlock(&dum->lock);
454 if (reset)
455 usb_gadget_udc_reset(&dum->gadget, dum->driver);
456 else
457 dum->driver->disconnect(&dum->gadget);
458 spin_lock(&dum->lock);
459 --dum->callback_usage;
460 }
461 } else if (dum_hcd->active != dum_hcd->old_active &&
462 dum->ints_enabled) {
463 ++dum->callback_usage;
464 spin_unlock(&dum->lock);
465 if (dum_hcd->old_active && dum->driver->suspend)
466 dum->driver->suspend(&dum->gadget);
467 else if (!dum_hcd->old_active && dum->driver->resume)
468 dum->driver->resume(&dum->gadget);
469 spin_lock(&dum->lock);
470 --dum->callback_usage;
471 }
472
473 dum_hcd->old_status = dum_hcd->port_status;
474 dum_hcd->old_active = dum_hcd->active;
475 }
476
477 /*-------------------------------------------------------------------------*/
478
479 /* SLAVE/GADGET SIDE DRIVER
480 *
481 * This only tracks gadget state. All the work is done when the host
482 * side tries some (emulated) i/o operation. Real device controller
483 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
484 */
485
486 #define is_enabled(dum) \
487 (dum->port_status & USB_PORT_STAT_ENABLE)
488
489 static int dummy_enable(struct usb_ep *_ep,
490 const struct usb_endpoint_descriptor *desc)
491 {
492 struct dummy *dum;
493 struct dummy_hcd *dum_hcd;
494 struct dummy_ep *ep;
495 unsigned max;
496 int retval;
497
498 ep = usb_ep_to_dummy_ep(_ep);
499 if (!_ep || !desc || ep->desc || _ep->name == ep0name
500 || desc->bDescriptorType != USB_DT_ENDPOINT)
501 return -EINVAL;
502 dum = ep_to_dummy(ep);
503 if (!dum->driver)
504 return -ESHUTDOWN;
505
506 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
507 if (!is_enabled(dum_hcd))
508 return -ESHUTDOWN;
509
510 /*
511 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
512 * maximum packet size.
513 * For SS devices the wMaxPacketSize is limited by 1024.
514 */
515 max = usb_endpoint_maxp(desc) & 0x7ff;
516
517 /* drivers must not request bad settings, since lower levels
518 * (hardware or its drivers) may not check. some endpoints
519 * can't do iso, many have maxpacket limitations, etc.
520 *
521 * since this "hardware" driver is here to help debugging, we
522 * have some extra sanity checks. (there could be more though,
523 * especially for "ep9out" style fixed function ones.)
524 */
525 retval = -EINVAL;
526 switch (usb_endpoint_type(desc)) {
527 case USB_ENDPOINT_XFER_BULK:
528 if (strstr(ep->ep.name, "-iso")
529 || strstr(ep->ep.name, "-int")) {
530 goto done;
531 }
532 switch (dum->gadget.speed) {
533 case USB_SPEED_SUPER:
534 if (max == 1024)
535 break;
536 goto done;
537 case USB_SPEED_HIGH:
538 if (max == 512)
539 break;
540 goto done;
541 case USB_SPEED_FULL:
542 if (max == 8 || max == 16 || max == 32 || max == 64)
543 /* we'll fake any legal size */
544 break;
545 /* save a return statement */
546 default:
547 goto done;
548 }
549 break;
550 case USB_ENDPOINT_XFER_INT:
551 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
552 goto done;
553 /* real hardware might not handle all packet sizes */
554 switch (dum->gadget.speed) {
555 case USB_SPEED_SUPER:
556 case USB_SPEED_HIGH:
557 if (max <= 1024)
558 break;
559 /* save a return statement */
560 case USB_SPEED_FULL:
561 if (max <= 64)
562 break;
563 /* save a return statement */
564 default:
565 if (max <= 8)
566 break;
567 goto done;
568 }
569 break;
570 case USB_ENDPOINT_XFER_ISOC:
571 if (strstr(ep->ep.name, "-bulk")
572 || strstr(ep->ep.name, "-int"))
573 goto done;
574 /* real hardware might not handle all packet sizes */
575 switch (dum->gadget.speed) {
576 case USB_SPEED_SUPER:
577 case USB_SPEED_HIGH:
578 if (max <= 1024)
579 break;
580 /* save a return statement */
581 case USB_SPEED_FULL:
582 if (max <= 1023)
583 break;
584 /* save a return statement */
585 default:
586 goto done;
587 }
588 break;
589 default:
590 /* few chips support control except on ep0 */
591 goto done;
592 }
593
594 _ep->maxpacket = max;
595 if (usb_ss_max_streams(_ep->comp_desc)) {
596 if (!usb_endpoint_xfer_bulk(desc)) {
597 dev_err(udc_dev(dum), "Can't enable stream support on "
598 "non-bulk ep %s\n", _ep->name);
599 return -EINVAL;
600 }
601 ep->stream_en = 1;
602 }
603 ep->desc = desc;
604
605 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
606 _ep->name,
607 desc->bEndpointAddress & 0x0f,
608 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
609 ({ char *val;
610 switch (usb_endpoint_type(desc)) {
611 case USB_ENDPOINT_XFER_BULK:
612 val = "bulk";
613 break;
614 case USB_ENDPOINT_XFER_ISOC:
615 val = "iso";
616 break;
617 case USB_ENDPOINT_XFER_INT:
618 val = "intr";
619 break;
620 default:
621 val = "ctrl";
622 break;
623 } val; }),
624 max, ep->stream_en ? "enabled" : "disabled");
625
626 /* at this point real hardware should be NAKing transfers
627 * to that endpoint, until a buffer is queued to it.
628 */
629 ep->halted = ep->wedged = 0;
630 retval = 0;
631 done:
632 return retval;
633 }
634
635 static int dummy_disable(struct usb_ep *_ep)
636 {
637 struct dummy_ep *ep;
638 struct dummy *dum;
639 unsigned long flags;
640
641 ep = usb_ep_to_dummy_ep(_ep);
642 if (!_ep || !ep->desc || _ep->name == ep0name)
643 return -EINVAL;
644 dum = ep_to_dummy(ep);
645
646 spin_lock_irqsave(&dum->lock, flags);
647 ep->desc = NULL;
648 ep->stream_en = 0;
649 nuke(dum, ep);
650 spin_unlock_irqrestore(&dum->lock, flags);
651
652 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
653 return 0;
654 }
655
656 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
657 gfp_t mem_flags)
658 {
659 struct dummy_request *req;
660
661 if (!_ep)
662 return NULL;
663
664 req = kzalloc(sizeof(*req), mem_flags);
665 if (!req)
666 return NULL;
667 INIT_LIST_HEAD(&req->queue);
668 return &req->req;
669 }
670
671 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
672 {
673 struct dummy_request *req;
674
675 if (!_ep || !_req) {
676 WARN_ON(1);
677 return;
678 }
679
680 req = usb_request_to_dummy_request(_req);
681 WARN_ON(!list_empty(&req->queue));
682 kfree(req);
683 }
684
685 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
686 {
687 }
688
689 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
690 gfp_t mem_flags)
691 {
692 struct dummy_ep *ep;
693 struct dummy_request *req;
694 struct dummy *dum;
695 struct dummy_hcd *dum_hcd;
696 unsigned long flags;
697
698 req = usb_request_to_dummy_request(_req);
699 if (!_req || !list_empty(&req->queue) || !_req->complete)
700 return -EINVAL;
701
702 ep = usb_ep_to_dummy_ep(_ep);
703 if (!_ep || (!ep->desc && _ep->name != ep0name))
704 return -EINVAL;
705
706 dum = ep_to_dummy(ep);
707 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
708 if (!dum->driver || !is_enabled(dum_hcd))
709 return -ESHUTDOWN;
710
711 #if 0
712 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
713 ep, _req, _ep->name, _req->length, _req->buf);
714 #endif
715 _req->status = -EINPROGRESS;
716 _req->actual = 0;
717 spin_lock_irqsave(&dum->lock, flags);
718
719 /* implement an emulated single-request FIFO */
720 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
721 list_empty(&dum->fifo_req.queue) &&
722 list_empty(&ep->queue) &&
723 _req->length <= FIFO_SIZE) {
724 req = &dum->fifo_req;
725 req->req = *_req;
726 req->req.buf = dum->fifo_buf;
727 memcpy(dum->fifo_buf, _req->buf, _req->length);
728 req->req.context = dum;
729 req->req.complete = fifo_complete;
730
731 list_add_tail(&req->queue, &ep->queue);
732 spin_unlock(&dum->lock);
733 _req->actual = _req->length;
734 _req->status = 0;
735 usb_gadget_giveback_request(_ep, _req);
736 spin_lock(&dum->lock);
737 } else
738 list_add_tail(&req->queue, &ep->queue);
739 spin_unlock_irqrestore(&dum->lock, flags);
740
741 /* real hardware would likely enable transfers here, in case
742 * it'd been left NAKing.
743 */
744 return 0;
745 }
746
747 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
748 {
749 struct dummy_ep *ep;
750 struct dummy *dum;
751 int retval = -EINVAL;
752 unsigned long flags;
753 struct dummy_request *req = NULL;
754
755 if (!_ep || !_req)
756 return retval;
757 ep = usb_ep_to_dummy_ep(_ep);
758 dum = ep_to_dummy(ep);
759
760 if (!dum->driver)
761 return -ESHUTDOWN;
762
763 local_irq_save(flags);
764 spin_lock(&dum->lock);
765 list_for_each_entry(req, &ep->queue, queue) {
766 if (&req->req == _req) {
767 list_del_init(&req->queue);
768 _req->status = -ECONNRESET;
769 retval = 0;
770 break;
771 }
772 }
773 spin_unlock(&dum->lock);
774
775 if (retval == 0) {
776 dev_dbg(udc_dev(dum),
777 "dequeued req %p from %s, len %d buf %p\n",
778 req, _ep->name, _req->length, _req->buf);
779 usb_gadget_giveback_request(_ep, _req);
780 }
781 local_irq_restore(flags);
782 return retval;
783 }
784
785 static int
786 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
787 {
788 struct dummy_ep *ep;
789 struct dummy *dum;
790
791 if (!_ep)
792 return -EINVAL;
793 ep = usb_ep_to_dummy_ep(_ep);
794 dum = ep_to_dummy(ep);
795 if (!dum->driver)
796 return -ESHUTDOWN;
797 if (!value)
798 ep->halted = ep->wedged = 0;
799 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
800 !list_empty(&ep->queue))
801 return -EAGAIN;
802 else {
803 ep->halted = 1;
804 if (wedged)
805 ep->wedged = 1;
806 }
807 /* FIXME clear emulated data toggle too */
808 return 0;
809 }
810
811 static int
812 dummy_set_halt(struct usb_ep *_ep, int value)
813 {
814 return dummy_set_halt_and_wedge(_ep, value, 0);
815 }
816
817 static int dummy_set_wedge(struct usb_ep *_ep)
818 {
819 if (!_ep || _ep->name == ep0name)
820 return -EINVAL;
821 return dummy_set_halt_and_wedge(_ep, 1, 1);
822 }
823
824 static const struct usb_ep_ops dummy_ep_ops = {
825 .enable = dummy_enable,
826 .disable = dummy_disable,
827
828 .alloc_request = dummy_alloc_request,
829 .free_request = dummy_free_request,
830
831 .queue = dummy_queue,
832 .dequeue = dummy_dequeue,
833
834 .set_halt = dummy_set_halt,
835 .set_wedge = dummy_set_wedge,
836 };
837
838 /*-------------------------------------------------------------------------*/
839
840 /* there are both host and device side versions of this call ... */
841 static int dummy_g_get_frame(struct usb_gadget *_gadget)
842 {
843 struct timespec64 ts64;
844
845 ktime_get_ts64(&ts64);
846 return ts64.tv_nsec / NSEC_PER_MSEC;
847 }
848
849 static int dummy_wakeup(struct usb_gadget *_gadget)
850 {
851 struct dummy_hcd *dum_hcd;
852
853 dum_hcd = gadget_to_dummy_hcd(_gadget);
854 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
855 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
856 return -EINVAL;
857 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
858 return -ENOLINK;
859 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
860 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
861 return -EIO;
862
863 /* FIXME: What if the root hub is suspended but the port isn't? */
864
865 /* hub notices our request, issues downstream resume, etc */
866 dum_hcd->resuming = 1;
867 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
868 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
869 return 0;
870 }
871
872 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
873 {
874 struct dummy *dum;
875
876 _gadget->is_selfpowered = (value != 0);
877 dum = gadget_to_dummy_hcd(_gadget)->dum;
878 if (value)
879 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
880 else
881 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
882 return 0;
883 }
884
885 static void dummy_udc_update_ep0(struct dummy *dum)
886 {
887 if (dum->gadget.speed == USB_SPEED_SUPER)
888 dum->ep[0].ep.maxpacket = 9;
889 else
890 dum->ep[0].ep.maxpacket = 64;
891 }
892
893 static int dummy_pullup(struct usb_gadget *_gadget, int value)
894 {
895 struct dummy_hcd *dum_hcd;
896 struct dummy *dum;
897 unsigned long flags;
898
899 dum = gadget_dev_to_dummy(&_gadget->dev);
900
901 if (value && dum->driver) {
902 if (mod_data.is_super_speed)
903 dum->gadget.speed = dum->driver->max_speed;
904 else if (mod_data.is_high_speed)
905 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
906 dum->driver->max_speed);
907 else
908 dum->gadget.speed = USB_SPEED_FULL;
909 dummy_udc_update_ep0(dum);
910
911 if (dum->gadget.speed < dum->driver->max_speed)
912 dev_dbg(udc_dev(dum), "This device can perform faster"
913 " if you connect it to a %s port...\n",
914 usb_speed_string(dum->driver->max_speed));
915 }
916 dum_hcd = gadget_to_dummy_hcd(_gadget);
917
918 spin_lock_irqsave(&dum->lock, flags);
919 dum->pullup = (value != 0);
920 set_link_state(dum_hcd);
921 spin_unlock_irqrestore(&dum->lock, flags);
922
923 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
924 return 0;
925 }
926
927 static int dummy_udc_start(struct usb_gadget *g,
928 struct usb_gadget_driver *driver);
929 static int dummy_udc_stop(struct usb_gadget *g);
930
931 static const struct usb_gadget_ops dummy_ops = {
932 .get_frame = dummy_g_get_frame,
933 .wakeup = dummy_wakeup,
934 .set_selfpowered = dummy_set_selfpowered,
935 .pullup = dummy_pullup,
936 .udc_start = dummy_udc_start,
937 .udc_stop = dummy_udc_stop,
938 };
939
940 /*-------------------------------------------------------------------------*/
941
942 /* "function" sysfs attribute */
943 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
944 char *buf)
945 {
946 struct dummy *dum = gadget_dev_to_dummy(dev);
947
948 if (!dum->driver || !dum->driver->function)
949 return 0;
950 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
951 }
952 static DEVICE_ATTR_RO(function);
953
954 /*-------------------------------------------------------------------------*/
955
956 /*
957 * Driver registration/unregistration.
958 *
959 * This is basically hardware-specific; there's usually only one real USB
960 * device (not host) controller since that's how USB devices are intended
961 * to work. So most implementations of these api calls will rely on the
962 * fact that only one driver will ever bind to the hardware. But curious
963 * hardware can be built with discrete components, so the gadget API doesn't
964 * require that assumption.
965 *
966 * For this emulator, it might be convenient to create a usb slave device
967 * for each driver that registers: just add to a big root hub.
968 */
969
970 static int dummy_udc_start(struct usb_gadget *g,
971 struct usb_gadget_driver *driver)
972 {
973 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
974 struct dummy *dum = dum_hcd->dum;
975
976 if (driver->max_speed == USB_SPEED_UNKNOWN)
977 return -EINVAL;
978
979 /*
980 * SLAVE side init ... the layer above hardware, which
981 * can't enumerate without help from the driver we're binding.
982 */
983
984 spin_lock_irq(&dum->lock);
985 dum->devstatus = 0;
986 dum->driver = driver;
987 dum->ints_enabled = 1;
988 spin_unlock_irq(&dum->lock);
989
990 return 0;
991 }
992
993 static int dummy_udc_stop(struct usb_gadget *g)
994 {
995 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
996 struct dummy *dum = dum_hcd->dum;
997
998 spin_lock_irq(&dum->lock);
999 dum->ints_enabled = 0;
1000 stop_activity(dum);
1001
1002 /* emulate synchronize_irq(): wait for callbacks to finish */
1003 while (dum->callback_usage > 0) {
1004 spin_unlock_irq(&dum->lock);
1005 usleep_range(1000, 2000);
1006 spin_lock_irq(&dum->lock);
1007 }
1008
1009 dum->driver = NULL;
1010 spin_unlock_irq(&dum->lock);
1011
1012 return 0;
1013 }
1014
1015 #undef is_enabled
1016
1017 /* The gadget structure is stored inside the hcd structure and will be
1018 * released along with it. */
1019 static void init_dummy_udc_hw(struct dummy *dum)
1020 {
1021 int i;
1022
1023 INIT_LIST_HEAD(&dum->gadget.ep_list);
1024 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1025 struct dummy_ep *ep = &dum->ep[i];
1026
1027 if (!ep_info[i].name)
1028 break;
1029 ep->ep.name = ep_info[i].name;
1030 ep->ep.caps = ep_info[i].caps;
1031 ep->ep.ops = &dummy_ep_ops;
1032 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1033 ep->halted = ep->wedged = ep->already_seen =
1034 ep->setup_stage = 0;
1035 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1036 ep->ep.max_streams = 16;
1037 ep->last_io = jiffies;
1038 ep->gadget = &dum->gadget;
1039 ep->desc = NULL;
1040 INIT_LIST_HEAD(&ep->queue);
1041 }
1042
1043 dum->gadget.ep0 = &dum->ep[0].ep;
1044 list_del_init(&dum->ep[0].ep.ep_list);
1045 INIT_LIST_HEAD(&dum->fifo_req.queue);
1046
1047 #ifdef CONFIG_USB_OTG
1048 dum->gadget.is_otg = 1;
1049 #endif
1050 }
1051
1052 static int dummy_udc_probe(struct platform_device *pdev)
1053 {
1054 struct dummy *dum;
1055 int rc;
1056
1057 dum = *((void **)dev_get_platdata(&pdev->dev));
1058 /* Clear usb_gadget region for new registration to udc-core */
1059 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1060 dum->gadget.name = gadget_name;
1061 dum->gadget.ops = &dummy_ops;
1062 if (mod_data.is_super_speed)
1063 dum->gadget.max_speed = USB_SPEED_SUPER;
1064 else if (mod_data.is_high_speed)
1065 dum->gadget.max_speed = USB_SPEED_HIGH;
1066 else
1067 dum->gadget.max_speed = USB_SPEED_FULL;
1068
1069 dum->gadget.dev.parent = &pdev->dev;
1070 init_dummy_udc_hw(dum);
1071
1072 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1073 if (rc < 0)
1074 goto err_udc;
1075
1076 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1077 if (rc < 0)
1078 goto err_dev;
1079 platform_set_drvdata(pdev, dum);
1080 return rc;
1081
1082 err_dev:
1083 usb_del_gadget_udc(&dum->gadget);
1084 err_udc:
1085 return rc;
1086 }
1087
1088 static int dummy_udc_remove(struct platform_device *pdev)
1089 {
1090 struct dummy *dum = platform_get_drvdata(pdev);
1091
1092 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1093 usb_del_gadget_udc(&dum->gadget);
1094 return 0;
1095 }
1096
1097 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1098 int suspend)
1099 {
1100 spin_lock_irq(&dum->lock);
1101 dum->udc_suspended = suspend;
1102 set_link_state(dum_hcd);
1103 spin_unlock_irq(&dum->lock);
1104 }
1105
1106 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1107 {
1108 struct dummy *dum = platform_get_drvdata(pdev);
1109 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1110
1111 dev_dbg(&pdev->dev, "%s\n", __func__);
1112 dummy_udc_pm(dum, dum_hcd, 1);
1113 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1114 return 0;
1115 }
1116
1117 static int dummy_udc_resume(struct platform_device *pdev)
1118 {
1119 struct dummy *dum = platform_get_drvdata(pdev);
1120 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1121
1122 dev_dbg(&pdev->dev, "%s\n", __func__);
1123 dummy_udc_pm(dum, dum_hcd, 0);
1124 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1125 return 0;
1126 }
1127
1128 static struct platform_driver dummy_udc_driver = {
1129 .probe = dummy_udc_probe,
1130 .remove = dummy_udc_remove,
1131 .suspend = dummy_udc_suspend,
1132 .resume = dummy_udc_resume,
1133 .driver = {
1134 .name = (char *) gadget_name,
1135 },
1136 };
1137
1138 /*-------------------------------------------------------------------------*/
1139
1140 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1141 {
1142 unsigned int index;
1143
1144 index = usb_endpoint_num(desc) << 1;
1145 if (usb_endpoint_dir_in(desc))
1146 index |= 1;
1147 return index;
1148 }
1149
1150 /* MASTER/HOST SIDE DRIVER
1151 *
1152 * this uses the hcd framework to hook up to host side drivers.
1153 * its root hub will only have one device, otherwise it acts like
1154 * a normal host controller.
1155 *
1156 * when urbs are queued, they're just stuck on a list that we
1157 * scan in a timer callback. that callback connects writes from
1158 * the host with reads from the device, and so on, based on the
1159 * usb 2.0 rules.
1160 */
1161
1162 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1163 {
1164 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1165 u32 index;
1166
1167 if (!usb_endpoint_xfer_bulk(desc))
1168 return 0;
1169
1170 index = dummy_get_ep_idx(desc);
1171 return (1 << index) & dum_hcd->stream_en_ep;
1172 }
1173
1174 /*
1175 * The max stream number is saved as a nibble so for the 30 possible endpoints
1176 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1177 * means we use only 1 stream). The maximum according to the spec is 16bit so
1178 * if the 16 stream limit is about to go, the array size should be incremented
1179 * to 30 elements of type u16.
1180 */
1181 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1182 unsigned int pipe)
1183 {
1184 int max_streams;
1185
1186 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1187 if (usb_pipeout(pipe))
1188 max_streams >>= 4;
1189 else
1190 max_streams &= 0xf;
1191 max_streams++;
1192 return max_streams;
1193 }
1194
1195 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1196 unsigned int pipe, unsigned int streams)
1197 {
1198 int max_streams;
1199
1200 streams--;
1201 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1202 if (usb_pipeout(pipe)) {
1203 streams <<= 4;
1204 max_streams &= 0xf;
1205 } else {
1206 max_streams &= 0xf0;
1207 }
1208 max_streams |= streams;
1209 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1210 }
1211
1212 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1213 {
1214 unsigned int max_streams;
1215 int enabled;
1216
1217 enabled = dummy_ep_stream_en(dum_hcd, urb);
1218 if (!urb->stream_id) {
1219 if (enabled)
1220 return -EINVAL;
1221 return 0;
1222 }
1223 if (!enabled)
1224 return -EINVAL;
1225
1226 max_streams = get_max_streams_for_pipe(dum_hcd,
1227 usb_pipeendpoint(urb->pipe));
1228 if (urb->stream_id > max_streams) {
1229 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1230 urb->stream_id);
1231 BUG();
1232 return -EINVAL;
1233 }
1234 return 0;
1235 }
1236
1237 static int dummy_urb_enqueue(
1238 struct usb_hcd *hcd,
1239 struct urb *urb,
1240 gfp_t mem_flags
1241 ) {
1242 struct dummy_hcd *dum_hcd;
1243 struct urbp *urbp;
1244 unsigned long flags;
1245 int rc;
1246
1247 urbp = kmalloc(sizeof *urbp, mem_flags);
1248 if (!urbp)
1249 return -ENOMEM;
1250 urbp->urb = urb;
1251 urbp->miter_started = 0;
1252
1253 dum_hcd = hcd_to_dummy_hcd(hcd);
1254 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1255
1256 rc = dummy_validate_stream(dum_hcd, urb);
1257 if (rc) {
1258 kfree(urbp);
1259 goto done;
1260 }
1261
1262 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1263 if (rc) {
1264 kfree(urbp);
1265 goto done;
1266 }
1267
1268 if (!dum_hcd->udev) {
1269 dum_hcd->udev = urb->dev;
1270 usb_get_dev(dum_hcd->udev);
1271 } else if (unlikely(dum_hcd->udev != urb->dev))
1272 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1273
1274 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1275 urb->hcpriv = urbp;
1276 if (!dum_hcd->next_frame_urbp)
1277 dum_hcd->next_frame_urbp = urbp;
1278 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1279 urb->error_count = 1; /* mark as a new urb */
1280
1281 /* kick the scheduler, it'll do the rest */
1282 if (!timer_pending(&dum_hcd->timer))
1283 mod_timer(&dum_hcd->timer, jiffies + 1);
1284
1285 done:
1286 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1287 return rc;
1288 }
1289
1290 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1291 {
1292 struct dummy_hcd *dum_hcd;
1293 unsigned long flags;
1294 int rc;
1295
1296 /* giveback happens automatically in timer callback,
1297 * so make sure the callback happens */
1298 dum_hcd = hcd_to_dummy_hcd(hcd);
1299 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1300
1301 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1302 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1303 !list_empty(&dum_hcd->urbp_list))
1304 mod_timer(&dum_hcd->timer, jiffies);
1305
1306 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1307 return rc;
1308 }
1309
1310 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1311 u32 len)
1312 {
1313 void *ubuf, *rbuf;
1314 struct urbp *urbp = urb->hcpriv;
1315 int to_host;
1316 struct sg_mapping_iter *miter = &urbp->miter;
1317 u32 trans = 0;
1318 u32 this_sg;
1319 bool next_sg;
1320
1321 to_host = usb_pipein(urb->pipe);
1322 rbuf = req->req.buf + req->req.actual;
1323
1324 if (!urb->num_sgs) {
1325 ubuf = urb->transfer_buffer + urb->actual_length;
1326 if (to_host)
1327 memcpy(ubuf, rbuf, len);
1328 else
1329 memcpy(rbuf, ubuf, len);
1330 return len;
1331 }
1332
1333 if (!urbp->miter_started) {
1334 u32 flags = SG_MITER_ATOMIC;
1335
1336 if (to_host)
1337 flags |= SG_MITER_TO_SG;
1338 else
1339 flags |= SG_MITER_FROM_SG;
1340
1341 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1342 urbp->miter_started = 1;
1343 }
1344 next_sg = sg_miter_next(miter);
1345 if (next_sg == false) {
1346 WARN_ON_ONCE(1);
1347 return -EINVAL;
1348 }
1349 do {
1350 ubuf = miter->addr;
1351 this_sg = min_t(u32, len, miter->length);
1352 miter->consumed = this_sg;
1353 trans += this_sg;
1354
1355 if (to_host)
1356 memcpy(ubuf, rbuf, this_sg);
1357 else
1358 memcpy(rbuf, ubuf, this_sg);
1359 len -= this_sg;
1360
1361 if (!len)
1362 break;
1363 next_sg = sg_miter_next(miter);
1364 if (next_sg == false) {
1365 WARN_ON_ONCE(1);
1366 return -EINVAL;
1367 }
1368
1369 rbuf += this_sg;
1370 } while (1);
1371
1372 sg_miter_stop(miter);
1373 return trans;
1374 }
1375
1376 /* transfer up to a frame's worth; caller must own lock */
1377 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1378 struct dummy_ep *ep, int limit, int *status)
1379 {
1380 struct dummy *dum = dum_hcd->dum;
1381 struct dummy_request *req;
1382 int sent = 0;
1383
1384 top:
1385 /* if there's no request queued, the device is NAKing; return */
1386 list_for_each_entry(req, &ep->queue, queue) {
1387 unsigned host_len, dev_len, len;
1388 int is_short, to_host;
1389 int rescan = 0;
1390
1391 if (dummy_ep_stream_en(dum_hcd, urb)) {
1392 if ((urb->stream_id != req->req.stream_id))
1393 continue;
1394 }
1395
1396 /* 1..N packets of ep->ep.maxpacket each ... the last one
1397 * may be short (including zero length).
1398 *
1399 * writer can send a zlp explicitly (length 0) or implicitly
1400 * (length mod maxpacket zero, and 'zero' flag); they always
1401 * terminate reads.
1402 */
1403 host_len = urb->transfer_buffer_length - urb->actual_length;
1404 dev_len = req->req.length - req->req.actual;
1405 len = min(host_len, dev_len);
1406
1407 /* FIXME update emulated data toggle too */
1408
1409 to_host = usb_pipein(urb->pipe);
1410 if (unlikely(len == 0))
1411 is_short = 1;
1412 else {
1413 /* not enough bandwidth left? */
1414 if (limit < ep->ep.maxpacket && limit < len)
1415 break;
1416 len = min_t(unsigned, len, limit);
1417 if (len == 0)
1418 break;
1419
1420 /* send multiple of maxpacket first, then remainder */
1421 if (len >= ep->ep.maxpacket) {
1422 is_short = 0;
1423 if (len % ep->ep.maxpacket)
1424 rescan = 1;
1425 len -= len % ep->ep.maxpacket;
1426 } else {
1427 is_short = 1;
1428 }
1429
1430 len = dummy_perform_transfer(urb, req, len);
1431
1432 ep->last_io = jiffies;
1433 if ((int)len < 0) {
1434 req->req.status = len;
1435 } else {
1436 limit -= len;
1437 sent += len;
1438 urb->actual_length += len;
1439 req->req.actual += len;
1440 }
1441 }
1442
1443 /* short packets terminate, maybe with overflow/underflow.
1444 * it's only really an error to write too much.
1445 *
1446 * partially filling a buffer optionally blocks queue advances
1447 * (so completion handlers can clean up the queue) but we don't
1448 * need to emulate such data-in-flight.
1449 */
1450 if (is_short) {
1451 if (host_len == dev_len) {
1452 req->req.status = 0;
1453 *status = 0;
1454 } else if (to_host) {
1455 req->req.status = 0;
1456 if (dev_len > host_len)
1457 *status = -EOVERFLOW;
1458 else
1459 *status = 0;
1460 } else {
1461 *status = 0;
1462 if (host_len > dev_len)
1463 req->req.status = -EOVERFLOW;
1464 else
1465 req->req.status = 0;
1466 }
1467
1468 /*
1469 * many requests terminate without a short packet.
1470 * send a zlp if demanded by flags.
1471 */
1472 } else {
1473 if (req->req.length == req->req.actual) {
1474 if (req->req.zero && to_host)
1475 rescan = 1;
1476 else
1477 req->req.status = 0;
1478 }
1479 if (urb->transfer_buffer_length == urb->actual_length) {
1480 if (urb->transfer_flags & URB_ZERO_PACKET &&
1481 !to_host)
1482 rescan = 1;
1483 else
1484 *status = 0;
1485 }
1486 }
1487
1488 /* device side completion --> continuable */
1489 if (req->req.status != -EINPROGRESS) {
1490 list_del_init(&req->queue);
1491
1492 spin_unlock(&dum->lock);
1493 usb_gadget_giveback_request(&ep->ep, &req->req);
1494 spin_lock(&dum->lock);
1495
1496 /* requests might have been unlinked... */
1497 rescan = 1;
1498 }
1499
1500 /* host side completion --> terminate */
1501 if (*status != -EINPROGRESS)
1502 break;
1503
1504 /* rescan to continue with any other queued i/o */
1505 if (rescan)
1506 goto top;
1507 }
1508 return sent;
1509 }
1510
1511 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1512 {
1513 int limit = ep->ep.maxpacket;
1514
1515 if (dum->gadget.speed == USB_SPEED_HIGH) {
1516 int tmp;
1517
1518 /* high bandwidth mode */
1519 tmp = usb_endpoint_maxp(ep->desc);
1520 tmp = (tmp >> 11) & 0x03;
1521 tmp *= 8 /* applies to entire frame */;
1522 limit += limit * tmp;
1523 }
1524 if (dum->gadget.speed == USB_SPEED_SUPER) {
1525 switch (usb_endpoint_type(ep->desc)) {
1526 case USB_ENDPOINT_XFER_ISOC:
1527 /* Sec. 4.4.8.2 USB3.0 Spec */
1528 limit = 3 * 16 * 1024 * 8;
1529 break;
1530 case USB_ENDPOINT_XFER_INT:
1531 /* Sec. 4.4.7.2 USB3.0 Spec */
1532 limit = 3 * 1024 * 8;
1533 break;
1534 case USB_ENDPOINT_XFER_BULK:
1535 default:
1536 break;
1537 }
1538 }
1539 return limit;
1540 }
1541
1542 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1543 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1544 USB_PORT_STAT_SUSPEND)) \
1545 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1546
1547 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1548 {
1549 int i;
1550
1551 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1552 dum->ss_hcd : dum->hs_hcd)))
1553 return NULL;
1554 if (!dum->ints_enabled)
1555 return NULL;
1556 if ((address & ~USB_DIR_IN) == 0)
1557 return &dum->ep[0];
1558 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1559 struct dummy_ep *ep = &dum->ep[i];
1560
1561 if (!ep->desc)
1562 continue;
1563 if (ep->desc->bEndpointAddress == address)
1564 return ep;
1565 }
1566 return NULL;
1567 }
1568
1569 #undef is_active
1570
1571 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1572 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1573 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1574 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1575 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1576 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1577
1578
1579 /**
1580 * handle_control_request() - handles all control transfers
1581 * @dum: pointer to dummy (the_controller)
1582 * @urb: the urb request to handle
1583 * @setup: pointer to the setup data for a USB device control
1584 * request
1585 * @status: pointer to request handling status
1586 *
1587 * Return 0 - if the request was handled
1588 * 1 - if the request wasn't handles
1589 * error code on error
1590 */
1591 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1592 struct usb_ctrlrequest *setup,
1593 int *status)
1594 {
1595 struct dummy_ep *ep2;
1596 struct dummy *dum = dum_hcd->dum;
1597 int ret_val = 1;
1598 unsigned w_index;
1599 unsigned w_value;
1600
1601 w_index = le16_to_cpu(setup->wIndex);
1602 w_value = le16_to_cpu(setup->wValue);
1603 switch (setup->bRequest) {
1604 case USB_REQ_SET_ADDRESS:
1605 if (setup->bRequestType != Dev_Request)
1606 break;
1607 dum->address = w_value;
1608 *status = 0;
1609 dev_dbg(udc_dev(dum), "set_address = %d\n",
1610 w_value);
1611 ret_val = 0;
1612 break;
1613 case USB_REQ_SET_FEATURE:
1614 if (setup->bRequestType == Dev_Request) {
1615 ret_val = 0;
1616 switch (w_value) {
1617 case USB_DEVICE_REMOTE_WAKEUP:
1618 break;
1619 case USB_DEVICE_B_HNP_ENABLE:
1620 dum->gadget.b_hnp_enable = 1;
1621 break;
1622 case USB_DEVICE_A_HNP_SUPPORT:
1623 dum->gadget.a_hnp_support = 1;
1624 break;
1625 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1626 dum->gadget.a_alt_hnp_support = 1;
1627 break;
1628 case USB_DEVICE_U1_ENABLE:
1629 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1630 HCD_USB3)
1631 w_value = USB_DEV_STAT_U1_ENABLED;
1632 else
1633 ret_val = -EOPNOTSUPP;
1634 break;
1635 case USB_DEVICE_U2_ENABLE:
1636 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1637 HCD_USB3)
1638 w_value = USB_DEV_STAT_U2_ENABLED;
1639 else
1640 ret_val = -EOPNOTSUPP;
1641 break;
1642 case USB_DEVICE_LTM_ENABLE:
1643 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1644 HCD_USB3)
1645 w_value = USB_DEV_STAT_LTM_ENABLED;
1646 else
1647 ret_val = -EOPNOTSUPP;
1648 break;
1649 default:
1650 ret_val = -EOPNOTSUPP;
1651 }
1652 if (ret_val == 0) {
1653 dum->devstatus |= (1 << w_value);
1654 *status = 0;
1655 }
1656 } else if (setup->bRequestType == Ep_Request) {
1657 /* endpoint halt */
1658 ep2 = find_endpoint(dum, w_index);
1659 if (!ep2 || ep2->ep.name == ep0name) {
1660 ret_val = -EOPNOTSUPP;
1661 break;
1662 }
1663 ep2->halted = 1;
1664 ret_val = 0;
1665 *status = 0;
1666 }
1667 break;
1668 case USB_REQ_CLEAR_FEATURE:
1669 if (setup->bRequestType == Dev_Request) {
1670 ret_val = 0;
1671 switch (w_value) {
1672 case USB_DEVICE_REMOTE_WAKEUP:
1673 w_value = USB_DEVICE_REMOTE_WAKEUP;
1674 break;
1675 case USB_DEVICE_U1_ENABLE:
1676 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1677 HCD_USB3)
1678 w_value = USB_DEV_STAT_U1_ENABLED;
1679 else
1680 ret_val = -EOPNOTSUPP;
1681 break;
1682 case USB_DEVICE_U2_ENABLE:
1683 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1684 HCD_USB3)
1685 w_value = USB_DEV_STAT_U2_ENABLED;
1686 else
1687 ret_val = -EOPNOTSUPP;
1688 break;
1689 case USB_DEVICE_LTM_ENABLE:
1690 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1691 HCD_USB3)
1692 w_value = USB_DEV_STAT_LTM_ENABLED;
1693 else
1694 ret_val = -EOPNOTSUPP;
1695 break;
1696 default:
1697 ret_val = -EOPNOTSUPP;
1698 break;
1699 }
1700 if (ret_val == 0) {
1701 dum->devstatus &= ~(1 << w_value);
1702 *status = 0;
1703 }
1704 } else if (setup->bRequestType == Ep_Request) {
1705 /* endpoint halt */
1706 ep2 = find_endpoint(dum, w_index);
1707 if (!ep2) {
1708 ret_val = -EOPNOTSUPP;
1709 break;
1710 }
1711 if (!ep2->wedged)
1712 ep2->halted = 0;
1713 ret_val = 0;
1714 *status = 0;
1715 }
1716 break;
1717 case USB_REQ_GET_STATUS:
1718 if (setup->bRequestType == Dev_InRequest
1719 || setup->bRequestType == Intf_InRequest
1720 || setup->bRequestType == Ep_InRequest) {
1721 char *buf;
1722 /*
1723 * device: remote wakeup, selfpowered
1724 * interface: nothing
1725 * endpoint: halt
1726 */
1727 buf = (char *)urb->transfer_buffer;
1728 if (urb->transfer_buffer_length > 0) {
1729 if (setup->bRequestType == Ep_InRequest) {
1730 ep2 = find_endpoint(dum, w_index);
1731 if (!ep2) {
1732 ret_val = -EOPNOTSUPP;
1733 break;
1734 }
1735 buf[0] = ep2->halted;
1736 } else if (setup->bRequestType ==
1737 Dev_InRequest) {
1738 buf[0] = (u8)dum->devstatus;
1739 } else
1740 buf[0] = 0;
1741 }
1742 if (urb->transfer_buffer_length > 1)
1743 buf[1] = 0;
1744 urb->actual_length = min_t(u32, 2,
1745 urb->transfer_buffer_length);
1746 ret_val = 0;
1747 *status = 0;
1748 }
1749 break;
1750 }
1751 return ret_val;
1752 }
1753
1754 /* drive both sides of the transfers; looks like irq handlers to
1755 * both drivers except the callbacks aren't in_irq().
1756 */
1757 static void dummy_timer(unsigned long _dum_hcd)
1758 {
1759 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1760 struct dummy *dum = dum_hcd->dum;
1761 struct urbp *urbp, *tmp;
1762 unsigned long flags;
1763 int limit, total;
1764 int i;
1765
1766 /* simplistic model for one frame's bandwidth */
1767 switch (dum->gadget.speed) {
1768 case USB_SPEED_LOW:
1769 total = 8/*bytes*/ * 12/*packets*/;
1770 break;
1771 case USB_SPEED_FULL:
1772 total = 64/*bytes*/ * 19/*packets*/;
1773 break;
1774 case USB_SPEED_HIGH:
1775 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1776 break;
1777 case USB_SPEED_SUPER:
1778 /* Bus speed is 500000 bytes/ms, so use a little less */
1779 total = 490000;
1780 break;
1781 default:
1782 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1783 return;
1784 }
1785
1786 /* FIXME if HZ != 1000 this will probably misbehave ... */
1787
1788 /* look at each urb queued by the host side driver */
1789 spin_lock_irqsave(&dum->lock, flags);
1790
1791 if (!dum_hcd->udev) {
1792 dev_err(dummy_dev(dum_hcd),
1793 "timer fired with no URBs pending?\n");
1794 spin_unlock_irqrestore(&dum->lock, flags);
1795 return;
1796 }
1797 dum_hcd->next_frame_urbp = NULL;
1798
1799 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1800 if (!ep_info[i].name)
1801 break;
1802 dum->ep[i].already_seen = 0;
1803 }
1804
1805 restart:
1806 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1807 struct urb *urb;
1808 struct dummy_request *req;
1809 u8 address;
1810 struct dummy_ep *ep = NULL;
1811 int type;
1812 int status = -EINPROGRESS;
1813
1814 /* stop when we reach URBs queued after the timer interrupt */
1815 if (urbp == dum_hcd->next_frame_urbp)
1816 break;
1817
1818 urb = urbp->urb;
1819 if (urb->unlinked)
1820 goto return_urb;
1821 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1822 continue;
1823 type = usb_pipetype(urb->pipe);
1824
1825 /* used up this frame's non-periodic bandwidth?
1826 * FIXME there's infinite bandwidth for control and
1827 * periodic transfers ... unrealistic.
1828 */
1829 if (total <= 0 && type == PIPE_BULK)
1830 continue;
1831
1832 /* find the gadget's ep for this request (if configured) */
1833 address = usb_pipeendpoint (urb->pipe);
1834 if (usb_pipein(urb->pipe))
1835 address |= USB_DIR_IN;
1836 ep = find_endpoint(dum, address);
1837 if (!ep) {
1838 /* set_configuration() disagreement */
1839 dev_dbg(dummy_dev(dum_hcd),
1840 "no ep configured for urb %p\n",
1841 urb);
1842 status = -EPROTO;
1843 goto return_urb;
1844 }
1845
1846 if (ep->already_seen)
1847 continue;
1848 ep->already_seen = 1;
1849 if (ep == &dum->ep[0] && urb->error_count) {
1850 ep->setup_stage = 1; /* a new urb */
1851 urb->error_count = 0;
1852 }
1853 if (ep->halted && !ep->setup_stage) {
1854 /* NOTE: must not be iso! */
1855 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1856 ep->ep.name, urb);
1857 status = -EPIPE;
1858 goto return_urb;
1859 }
1860 /* FIXME make sure both ends agree on maxpacket */
1861
1862 /* handle control requests */
1863 if (ep == &dum->ep[0] && ep->setup_stage) {
1864 struct usb_ctrlrequest setup;
1865 int value = 1;
1866
1867 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1868 /* paranoia, in case of stale queued data */
1869 list_for_each_entry(req, &ep->queue, queue) {
1870 list_del_init(&req->queue);
1871 req->req.status = -EOVERFLOW;
1872 dev_dbg(udc_dev(dum), "stale req = %p\n",
1873 req);
1874
1875 spin_unlock(&dum->lock);
1876 usb_gadget_giveback_request(&ep->ep, &req->req);
1877 spin_lock(&dum->lock);
1878 ep->already_seen = 0;
1879 goto restart;
1880 }
1881
1882 /* gadget driver never sees set_address or operations
1883 * on standard feature flags. some hardware doesn't
1884 * even expose them.
1885 */
1886 ep->last_io = jiffies;
1887 ep->setup_stage = 0;
1888 ep->halted = 0;
1889
1890 value = handle_control_request(dum_hcd, urb, &setup,
1891 &status);
1892
1893 /* gadget driver handles all other requests. block
1894 * until setup() returns; no reentrancy issues etc.
1895 */
1896 if (value > 0) {
1897 ++dum->callback_usage;
1898 spin_unlock(&dum->lock);
1899 value = dum->driver->setup(&dum->gadget,
1900 &setup);
1901 spin_lock(&dum->lock);
1902 --dum->callback_usage;
1903
1904 if (value >= 0) {
1905 /* no delays (max 64KB data stage) */
1906 limit = 64*1024;
1907 goto treat_control_like_bulk;
1908 }
1909 /* error, see below */
1910 }
1911
1912 if (value < 0) {
1913 if (value != -EOPNOTSUPP)
1914 dev_dbg(udc_dev(dum),
1915 "setup --> %d\n",
1916 value);
1917 status = -EPIPE;
1918 urb->actual_length = 0;
1919 }
1920
1921 goto return_urb;
1922 }
1923
1924 /* non-control requests */
1925 limit = total;
1926 switch (usb_pipetype(urb->pipe)) {
1927 case PIPE_ISOCHRONOUS:
1928 /* FIXME is it urb->interval since the last xfer?
1929 * use urb->iso_frame_desc[i].
1930 * complete whether or not ep has requests queued.
1931 * report random errors, to debug drivers.
1932 */
1933 limit = max(limit, periodic_bytes(dum, ep));
1934 status = -ENOSYS;
1935 break;
1936
1937 case PIPE_INTERRUPT:
1938 /* FIXME is it urb->interval since the last xfer?
1939 * this almost certainly polls too fast.
1940 */
1941 limit = max(limit, periodic_bytes(dum, ep));
1942 /* FALLTHROUGH */
1943
1944 default:
1945 treat_control_like_bulk:
1946 ep->last_io = jiffies;
1947 total -= transfer(dum_hcd, urb, ep, limit, &status);
1948 break;
1949 }
1950
1951 /* incomplete transfer? */
1952 if (status == -EINPROGRESS)
1953 continue;
1954
1955 return_urb:
1956 list_del(&urbp->urbp_list);
1957 kfree(urbp);
1958 if (ep)
1959 ep->already_seen = ep->setup_stage = 0;
1960
1961 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1962 spin_unlock(&dum->lock);
1963 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1964 spin_lock(&dum->lock);
1965
1966 goto restart;
1967 }
1968
1969 if (list_empty(&dum_hcd->urbp_list)) {
1970 usb_put_dev(dum_hcd->udev);
1971 dum_hcd->udev = NULL;
1972 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1973 /* want a 1 msec delay here */
1974 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1975 }
1976
1977 spin_unlock_irqrestore(&dum->lock, flags);
1978 }
1979
1980 /*-------------------------------------------------------------------------*/
1981
1982 #define PORT_C_MASK \
1983 ((USB_PORT_STAT_C_CONNECTION \
1984 | USB_PORT_STAT_C_ENABLE \
1985 | USB_PORT_STAT_C_SUSPEND \
1986 | USB_PORT_STAT_C_OVERCURRENT \
1987 | USB_PORT_STAT_C_RESET) << 16)
1988
1989 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1990 {
1991 struct dummy_hcd *dum_hcd;
1992 unsigned long flags;
1993 int retval = 0;
1994
1995 dum_hcd = hcd_to_dummy_hcd(hcd);
1996
1997 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1998 if (!HCD_HW_ACCESSIBLE(hcd))
1999 goto done;
2000
2001 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2002 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2003 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2004 set_link_state(dum_hcd);
2005 }
2006
2007 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2008 *buf = (1 << 1);
2009 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2010 dum_hcd->port_status);
2011 retval = 1;
2012 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2013 usb_hcd_resume_root_hub(hcd);
2014 }
2015 done:
2016 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2017 return retval;
2018 }
2019
2020 /* usb 3.0 root hub device descriptor */
2021 static struct {
2022 struct usb_bos_descriptor bos;
2023 struct usb_ss_cap_descriptor ss_cap;
2024 } __packed usb3_bos_desc = {
2025
2026 .bos = {
2027 .bLength = USB_DT_BOS_SIZE,
2028 .bDescriptorType = USB_DT_BOS,
2029 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
2030 .bNumDeviceCaps = 1,
2031 },
2032 .ss_cap = {
2033 .bLength = USB_DT_USB_SS_CAP_SIZE,
2034 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
2035 .bDevCapabilityType = USB_SS_CAP_TYPE,
2036 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
2037 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
2038 },
2039 };
2040
2041 static inline void
2042 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2043 {
2044 memset(desc, 0, sizeof *desc);
2045 desc->bDescriptorType = USB_DT_SS_HUB;
2046 desc->bDescLength = 12;
2047 desc->wHubCharacteristics = cpu_to_le16(
2048 HUB_CHAR_INDV_PORT_LPSM |
2049 HUB_CHAR_COMMON_OCPM);
2050 desc->bNbrPorts = 1;
2051 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2052 desc->u.ss.DeviceRemovable = 0;
2053 }
2054
2055 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2056 {
2057 memset(desc, 0, sizeof *desc);
2058 desc->bDescriptorType = USB_DT_HUB;
2059 desc->bDescLength = 9;
2060 desc->wHubCharacteristics = cpu_to_le16(
2061 HUB_CHAR_INDV_PORT_LPSM |
2062 HUB_CHAR_COMMON_OCPM);
2063 desc->bNbrPorts = 1;
2064 desc->u.hs.DeviceRemovable[0] = 0;
2065 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */
2066 }
2067
2068 static int dummy_hub_control(
2069 struct usb_hcd *hcd,
2070 u16 typeReq,
2071 u16 wValue,
2072 u16 wIndex,
2073 char *buf,
2074 u16 wLength
2075 ) {
2076 struct dummy_hcd *dum_hcd;
2077 int retval = 0;
2078 unsigned long flags;
2079
2080 if (!HCD_HW_ACCESSIBLE(hcd))
2081 return -ETIMEDOUT;
2082
2083 dum_hcd = hcd_to_dummy_hcd(hcd);
2084
2085 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2086 switch (typeReq) {
2087 case ClearHubFeature:
2088 break;
2089 case ClearPortFeature:
2090 switch (wValue) {
2091 case USB_PORT_FEAT_SUSPEND:
2092 if (hcd->speed == HCD_USB3) {
2093 dev_dbg(dummy_dev(dum_hcd),
2094 "USB_PORT_FEAT_SUSPEND req not "
2095 "supported for USB 3.0 roothub\n");
2096 goto error;
2097 }
2098 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2099 /* 20msec resume signaling */
2100 dum_hcd->resuming = 1;
2101 dum_hcd->re_timeout = jiffies +
2102 msecs_to_jiffies(20);
2103 }
2104 break;
2105 case USB_PORT_FEAT_POWER:
2106 dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2107 if (hcd->speed == HCD_USB3)
2108 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2109 else
2110 dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2111 set_link_state(dum_hcd);
2112 break;
2113 default:
2114 dum_hcd->port_status &= ~(1 << wValue);
2115 set_link_state(dum_hcd);
2116 }
2117 break;
2118 case GetHubDescriptor:
2119 if (hcd->speed == HCD_USB3 &&
2120 (wLength < USB_DT_SS_HUB_SIZE ||
2121 wValue != (USB_DT_SS_HUB << 8))) {
2122 dev_dbg(dummy_dev(dum_hcd),
2123 "Wrong hub descriptor type for "
2124 "USB 3.0 roothub.\n");
2125 goto error;
2126 }
2127 if (hcd->speed == HCD_USB3)
2128 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2129 else
2130 hub_descriptor((struct usb_hub_descriptor *) buf);
2131 break;
2132
2133 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2134 if (hcd->speed != HCD_USB3)
2135 goto error;
2136
2137 if ((wValue >> 8) != USB_DT_BOS)
2138 goto error;
2139
2140 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2141 retval = sizeof(usb3_bos_desc);
2142 break;
2143
2144 case GetHubStatus:
2145 *(__le32 *) buf = cpu_to_le32(0);
2146 break;
2147 case GetPortStatus:
2148 if (wIndex != 1)
2149 retval = -EPIPE;
2150
2151 /* whoever resets or resumes must GetPortStatus to
2152 * complete it!!
2153 */
2154 if (dum_hcd->resuming &&
2155 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2156 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2157 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2158 }
2159 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2160 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2161 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2162 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2163 if (dum_hcd->dum->pullup) {
2164 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2165
2166 if (hcd->speed < HCD_USB3) {
2167 switch (dum_hcd->dum->gadget.speed) {
2168 case USB_SPEED_HIGH:
2169 dum_hcd->port_status |=
2170 USB_PORT_STAT_HIGH_SPEED;
2171 break;
2172 case USB_SPEED_LOW:
2173 dum_hcd->dum->gadget.ep0->
2174 maxpacket = 8;
2175 dum_hcd->port_status |=
2176 USB_PORT_STAT_LOW_SPEED;
2177 break;
2178 default:
2179 dum_hcd->dum->gadget.speed =
2180 USB_SPEED_FULL;
2181 break;
2182 }
2183 }
2184 }
2185 }
2186 set_link_state(dum_hcd);
2187 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2188 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2189 break;
2190 case SetHubFeature:
2191 retval = -EPIPE;
2192 break;
2193 case SetPortFeature:
2194 switch (wValue) {
2195 case USB_PORT_FEAT_LINK_STATE:
2196 if (hcd->speed != HCD_USB3) {
2197 dev_dbg(dummy_dev(dum_hcd),
2198 "USB_PORT_FEAT_LINK_STATE req not "
2199 "supported for USB 2.0 roothub\n");
2200 goto error;
2201 }
2202 /*
2203 * Since this is dummy we don't have an actual link so
2204 * there is nothing to do for the SET_LINK_STATE cmd
2205 */
2206 break;
2207 case USB_PORT_FEAT_U1_TIMEOUT:
2208 case USB_PORT_FEAT_U2_TIMEOUT:
2209 /* TODO: add suspend/resume support! */
2210 if (hcd->speed != HCD_USB3) {
2211 dev_dbg(dummy_dev(dum_hcd),
2212 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2213 "supported for USB 2.0 roothub\n");
2214 goto error;
2215 }
2216 break;
2217 case USB_PORT_FEAT_SUSPEND:
2218 /* Applicable only for USB2.0 hub */
2219 if (hcd->speed == HCD_USB3) {
2220 dev_dbg(dummy_dev(dum_hcd),
2221 "USB_PORT_FEAT_SUSPEND req not "
2222 "supported for USB 3.0 roothub\n");
2223 goto error;
2224 }
2225 if (dum_hcd->active) {
2226 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2227
2228 /* HNP would happen here; for now we
2229 * assume b_bus_req is always true.
2230 */
2231 set_link_state(dum_hcd);
2232 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2233 & dum_hcd->dum->devstatus) != 0)
2234 dev_dbg(dummy_dev(dum_hcd),
2235 "no HNP yet!\n");
2236 }
2237 break;
2238 case USB_PORT_FEAT_POWER:
2239 if (hcd->speed == HCD_USB3)
2240 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2241 else
2242 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2243 set_link_state(dum_hcd);
2244 break;
2245 case USB_PORT_FEAT_BH_PORT_RESET:
2246 /* Applicable only for USB3.0 hub */
2247 if (hcd->speed != HCD_USB3) {
2248 dev_dbg(dummy_dev(dum_hcd),
2249 "USB_PORT_FEAT_BH_PORT_RESET req not "
2250 "supported for USB 2.0 roothub\n");
2251 goto error;
2252 }
2253 /* FALLS THROUGH */
2254 case USB_PORT_FEAT_RESET:
2255 /* if it's already enabled, disable */
2256 if (hcd->speed == HCD_USB3) {
2257 dum_hcd->port_status = 0;
2258 dum_hcd->port_status =
2259 (USB_SS_PORT_STAT_POWER |
2260 USB_PORT_STAT_CONNECTION |
2261 USB_PORT_STAT_RESET);
2262 } else
2263 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2264 | USB_PORT_STAT_LOW_SPEED
2265 | USB_PORT_STAT_HIGH_SPEED);
2266 /*
2267 * We want to reset device status. All but the
2268 * Self powered feature
2269 */
2270 dum_hcd->dum->devstatus &=
2271 (1 << USB_DEVICE_SELF_POWERED);
2272 /*
2273 * FIXME USB3.0: what is the correct reset signaling
2274 * interval? Is it still 50msec as for HS?
2275 */
2276 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2277 /* FALLS THROUGH */
2278 default:
2279 if (hcd->speed == HCD_USB3) {
2280 if ((dum_hcd->port_status &
2281 USB_SS_PORT_STAT_POWER) != 0) {
2282 dum_hcd->port_status |= (1 << wValue);
2283 }
2284 } else
2285 if ((dum_hcd->port_status &
2286 USB_PORT_STAT_POWER) != 0) {
2287 dum_hcd->port_status |= (1 << wValue);
2288 }
2289 set_link_state(dum_hcd);
2290 }
2291 break;
2292 case GetPortErrorCount:
2293 if (hcd->speed != HCD_USB3) {
2294 dev_dbg(dummy_dev(dum_hcd),
2295 "GetPortErrorCount req not "
2296 "supported for USB 2.0 roothub\n");
2297 goto error;
2298 }
2299 /* We'll always return 0 since this is a dummy hub */
2300 *(__le32 *) buf = cpu_to_le32(0);
2301 break;
2302 case SetHubDepth:
2303 if (hcd->speed != HCD_USB3) {
2304 dev_dbg(dummy_dev(dum_hcd),
2305 "SetHubDepth req not supported for "
2306 "USB 2.0 roothub\n");
2307 goto error;
2308 }
2309 break;
2310 default:
2311 dev_dbg(dummy_dev(dum_hcd),
2312 "hub control req%04x v%04x i%04x l%d\n",
2313 typeReq, wValue, wIndex, wLength);
2314 error:
2315 /* "protocol stall" on error */
2316 retval = -EPIPE;
2317 }
2318 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2319
2320 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2321 usb_hcd_poll_rh_status(hcd);
2322 return retval;
2323 }
2324
2325 static int dummy_bus_suspend(struct usb_hcd *hcd)
2326 {
2327 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2328
2329 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2330
2331 spin_lock_irq(&dum_hcd->dum->lock);
2332 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2333 set_link_state(dum_hcd);
2334 hcd->state = HC_STATE_SUSPENDED;
2335 spin_unlock_irq(&dum_hcd->dum->lock);
2336 return 0;
2337 }
2338
2339 static int dummy_bus_resume(struct usb_hcd *hcd)
2340 {
2341 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2342 int rc = 0;
2343
2344 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2345
2346 spin_lock_irq(&dum_hcd->dum->lock);
2347 if (!HCD_HW_ACCESSIBLE(hcd)) {
2348 rc = -ESHUTDOWN;
2349 } else {
2350 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2351 set_link_state(dum_hcd);
2352 if (!list_empty(&dum_hcd->urbp_list))
2353 mod_timer(&dum_hcd->timer, jiffies);
2354 hcd->state = HC_STATE_RUNNING;
2355 }
2356 spin_unlock_irq(&dum_hcd->dum->lock);
2357 return rc;
2358 }
2359
2360 /*-------------------------------------------------------------------------*/
2361
2362 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2363 {
2364 int ep = usb_pipeendpoint(urb->pipe);
2365
2366 return snprintf(buf, size,
2367 "urb/%p %s ep%d%s%s len %d/%d\n",
2368 urb,
2369 ({ char *s;
2370 switch (urb->dev->speed) {
2371 case USB_SPEED_LOW:
2372 s = "ls";
2373 break;
2374 case USB_SPEED_FULL:
2375 s = "fs";
2376 break;
2377 case USB_SPEED_HIGH:
2378 s = "hs";
2379 break;
2380 case USB_SPEED_SUPER:
2381 s = "ss";
2382 break;
2383 default:
2384 s = "?";
2385 break;
2386 } s; }),
2387 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2388 ({ char *s; \
2389 switch (usb_pipetype(urb->pipe)) { \
2390 case PIPE_CONTROL: \
2391 s = ""; \
2392 break; \
2393 case PIPE_BULK: \
2394 s = "-bulk"; \
2395 break; \
2396 case PIPE_INTERRUPT: \
2397 s = "-int"; \
2398 break; \
2399 default: \
2400 s = "-iso"; \
2401 break; \
2402 } s; }),
2403 urb->actual_length, urb->transfer_buffer_length);
2404 }
2405
2406 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2407 char *buf)
2408 {
2409 struct usb_hcd *hcd = dev_get_drvdata(dev);
2410 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2411 struct urbp *urbp;
2412 size_t size = 0;
2413 unsigned long flags;
2414
2415 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2416 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2417 size_t temp;
2418
2419 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2420 buf += temp;
2421 size += temp;
2422 }
2423 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2424
2425 return size;
2426 }
2427 static DEVICE_ATTR_RO(urbs);
2428
2429 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2430 {
2431 init_timer(&dum_hcd->timer);
2432 dum_hcd->timer.function = dummy_timer;
2433 dum_hcd->timer.data = (unsigned long)dum_hcd;
2434 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2435 dum_hcd->stream_en_ep = 0;
2436 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2437 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2438 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2439 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2440 #ifdef CONFIG_USB_OTG
2441 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2442 #endif
2443 return 0;
2444
2445 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2446 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2447 }
2448
2449 static int dummy_start(struct usb_hcd *hcd)
2450 {
2451 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2452
2453 /*
2454 * MASTER side init ... we emulate a root hub that'll only ever
2455 * talk to one device (the slave side). Also appears in sysfs,
2456 * just like more familiar pci-based HCDs.
2457 */
2458 if (!usb_hcd_is_primary_hcd(hcd))
2459 return dummy_start_ss(dum_hcd);
2460
2461 spin_lock_init(&dum_hcd->dum->lock);
2462 init_timer(&dum_hcd->timer);
2463 dum_hcd->timer.function = dummy_timer;
2464 dum_hcd->timer.data = (unsigned long)dum_hcd;
2465 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2466
2467 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2468
2469 hcd->power_budget = POWER_BUDGET;
2470 hcd->state = HC_STATE_RUNNING;
2471 hcd->uses_new_polling = 1;
2472
2473 #ifdef CONFIG_USB_OTG
2474 hcd->self.otg_port = 1;
2475 #endif
2476
2477 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2478 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2479 }
2480
2481 static void dummy_stop(struct usb_hcd *hcd)
2482 {
2483 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2484 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2485 }
2486
2487 /*-------------------------------------------------------------------------*/
2488
2489 static int dummy_h_get_frame(struct usb_hcd *hcd)
2490 {
2491 return dummy_g_get_frame(NULL);
2492 }
2493
2494 static int dummy_setup(struct usb_hcd *hcd)
2495 {
2496 struct dummy *dum;
2497
2498 dum = *((void **)dev_get_platdata(hcd->self.controller));
2499 hcd->self.sg_tablesize = ~0;
2500 if (usb_hcd_is_primary_hcd(hcd)) {
2501 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2502 dum->hs_hcd->dum = dum;
2503 /*
2504 * Mark the first roothub as being USB 2.0.
2505 * The USB 3.0 roothub will be registered later by
2506 * dummy_hcd_probe()
2507 */
2508 hcd->speed = HCD_USB2;
2509 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2510 } else {
2511 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2512 dum->ss_hcd->dum = dum;
2513 hcd->speed = HCD_USB3;
2514 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2515 }
2516 return 0;
2517 }
2518
2519 /* Change a group of bulk endpoints to support multiple stream IDs */
2520 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2521 struct usb_host_endpoint **eps, unsigned int num_eps,
2522 unsigned int num_streams, gfp_t mem_flags)
2523 {
2524 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2525 unsigned long flags;
2526 int max_stream;
2527 int ret_streams = num_streams;
2528 unsigned int index;
2529 unsigned int i;
2530
2531 if (!num_eps)
2532 return -EINVAL;
2533
2534 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2535 for (i = 0; i < num_eps; i++) {
2536 index = dummy_get_ep_idx(&eps[i]->desc);
2537 if ((1 << index) & dum_hcd->stream_en_ep) {
2538 ret_streams = -EINVAL;
2539 goto out;
2540 }
2541 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2542 if (!max_stream) {
2543 ret_streams = -EINVAL;
2544 goto out;
2545 }
2546 if (max_stream < ret_streams) {
2547 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2548 "stream IDs.\n",
2549 eps[i]->desc.bEndpointAddress,
2550 max_stream);
2551 ret_streams = max_stream;
2552 }
2553 }
2554
2555 for (i = 0; i < num_eps; i++) {
2556 index = dummy_get_ep_idx(&eps[i]->desc);
2557 dum_hcd->stream_en_ep |= 1 << index;
2558 set_max_streams_for_pipe(dum_hcd,
2559 usb_endpoint_num(&eps[i]->desc), ret_streams);
2560 }
2561 out:
2562 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2563 return ret_streams;
2564 }
2565
2566 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2567 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2568 struct usb_host_endpoint **eps, unsigned int num_eps,
2569 gfp_t mem_flags)
2570 {
2571 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2572 unsigned long flags;
2573 int ret;
2574 unsigned int index;
2575 unsigned int i;
2576
2577 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2578 for (i = 0; i < num_eps; i++) {
2579 index = dummy_get_ep_idx(&eps[i]->desc);
2580 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2581 ret = -EINVAL;
2582 goto out;
2583 }
2584 }
2585
2586 for (i = 0; i < num_eps; i++) {
2587 index = dummy_get_ep_idx(&eps[i]->desc);
2588 dum_hcd->stream_en_ep &= ~(1 << index);
2589 set_max_streams_for_pipe(dum_hcd,
2590 usb_endpoint_num(&eps[i]->desc), 0);
2591 }
2592 ret = 0;
2593 out:
2594 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2595 return ret;
2596 }
2597
2598 static struct hc_driver dummy_hcd = {
2599 .description = (char *) driver_name,
2600 .product_desc = "Dummy host controller",
2601 .hcd_priv_size = sizeof(struct dummy_hcd),
2602
2603 .reset = dummy_setup,
2604 .start = dummy_start,
2605 .stop = dummy_stop,
2606
2607 .urb_enqueue = dummy_urb_enqueue,
2608 .urb_dequeue = dummy_urb_dequeue,
2609
2610 .get_frame_number = dummy_h_get_frame,
2611
2612 .hub_status_data = dummy_hub_status,
2613 .hub_control = dummy_hub_control,
2614 .bus_suspend = dummy_bus_suspend,
2615 .bus_resume = dummy_bus_resume,
2616
2617 .alloc_streams = dummy_alloc_streams,
2618 .free_streams = dummy_free_streams,
2619 };
2620
2621 static int dummy_hcd_probe(struct platform_device *pdev)
2622 {
2623 struct dummy *dum;
2624 struct usb_hcd *hs_hcd;
2625 struct usb_hcd *ss_hcd;
2626 int retval;
2627
2628 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2629 dum = *((void **)dev_get_platdata(&pdev->dev));
2630
2631 if (mod_data.is_super_speed)
2632 dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2633 else if (mod_data.is_high_speed)
2634 dummy_hcd.flags = HCD_USB2;
2635 else
2636 dummy_hcd.flags = HCD_USB11;
2637 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2638 if (!hs_hcd)
2639 return -ENOMEM;
2640 hs_hcd->has_tt = 1;
2641
2642 retval = usb_add_hcd(hs_hcd, 0, 0);
2643 if (retval)
2644 goto put_usb2_hcd;
2645
2646 if (mod_data.is_super_speed) {
2647 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2648 dev_name(&pdev->dev), hs_hcd);
2649 if (!ss_hcd) {
2650 retval = -ENOMEM;
2651 goto dealloc_usb2_hcd;
2652 }
2653
2654 retval = usb_add_hcd(ss_hcd, 0, 0);
2655 if (retval)
2656 goto put_usb3_hcd;
2657 }
2658 return 0;
2659
2660 put_usb3_hcd:
2661 usb_put_hcd(ss_hcd);
2662 dealloc_usb2_hcd:
2663 usb_remove_hcd(hs_hcd);
2664 put_usb2_hcd:
2665 usb_put_hcd(hs_hcd);
2666 dum->hs_hcd = dum->ss_hcd = NULL;
2667 return retval;
2668 }
2669
2670 static int dummy_hcd_remove(struct platform_device *pdev)
2671 {
2672 struct dummy *dum;
2673
2674 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2675
2676 if (dum->ss_hcd) {
2677 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2678 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2679 }
2680
2681 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2682 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2683
2684 dum->hs_hcd = NULL;
2685 dum->ss_hcd = NULL;
2686
2687 return 0;
2688 }
2689
2690 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2691 {
2692 struct usb_hcd *hcd;
2693 struct dummy_hcd *dum_hcd;
2694 int rc = 0;
2695
2696 dev_dbg(&pdev->dev, "%s\n", __func__);
2697
2698 hcd = platform_get_drvdata(pdev);
2699 dum_hcd = hcd_to_dummy_hcd(hcd);
2700 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2701 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2702 rc = -EBUSY;
2703 } else
2704 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2705 return rc;
2706 }
2707
2708 static int dummy_hcd_resume(struct platform_device *pdev)
2709 {
2710 struct usb_hcd *hcd;
2711
2712 dev_dbg(&pdev->dev, "%s\n", __func__);
2713
2714 hcd = platform_get_drvdata(pdev);
2715 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2716 usb_hcd_poll_rh_status(hcd);
2717 return 0;
2718 }
2719
2720 static struct platform_driver dummy_hcd_driver = {
2721 .probe = dummy_hcd_probe,
2722 .remove = dummy_hcd_remove,
2723 .suspend = dummy_hcd_suspend,
2724 .resume = dummy_hcd_resume,
2725 .driver = {
2726 .name = (char *) driver_name,
2727 },
2728 };
2729
2730 /*-------------------------------------------------------------------------*/
2731 #define MAX_NUM_UDC 2
2732 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2733 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2734
2735 static int __init init(void)
2736 {
2737 int retval = -ENOMEM;
2738 int i;
2739 struct dummy *dum[MAX_NUM_UDC];
2740
2741 if (usb_disabled())
2742 return -ENODEV;
2743
2744 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2745 return -EINVAL;
2746
2747 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2748 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2749 MAX_NUM_UDC);
2750 return -EINVAL;
2751 }
2752
2753 for (i = 0; i < mod_data.num; i++) {
2754 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2755 if (!the_hcd_pdev[i]) {
2756 i--;
2757 while (i >= 0)
2758 platform_device_put(the_hcd_pdev[i--]);
2759 return retval;
2760 }
2761 }
2762 for (i = 0; i < mod_data.num; i++) {
2763 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2764 if (!the_udc_pdev[i]) {
2765 i--;
2766 while (i >= 0)
2767 platform_device_put(the_udc_pdev[i--]);
2768 goto err_alloc_udc;
2769 }
2770 }
2771 for (i = 0; i < mod_data.num; i++) {
2772 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2773 if (!dum[i]) {
2774 retval = -ENOMEM;
2775 goto err_add_pdata;
2776 }
2777 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2778 sizeof(void *));
2779 if (retval)
2780 goto err_add_pdata;
2781 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2782 sizeof(void *));
2783 if (retval)
2784 goto err_add_pdata;
2785 }
2786
2787 retval = platform_driver_register(&dummy_hcd_driver);
2788 if (retval < 0)
2789 goto err_add_pdata;
2790 retval = platform_driver_register(&dummy_udc_driver);
2791 if (retval < 0)
2792 goto err_register_udc_driver;
2793
2794 for (i = 0; i < mod_data.num; i++) {
2795 retval = platform_device_add(the_hcd_pdev[i]);
2796 if (retval < 0) {
2797 i--;
2798 while (i >= 0)
2799 platform_device_del(the_hcd_pdev[i--]);
2800 goto err_add_hcd;
2801 }
2802 }
2803 for (i = 0; i < mod_data.num; i++) {
2804 if (!dum[i]->hs_hcd ||
2805 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2806 /*
2807 * The hcd was added successfully but its probe
2808 * function failed for some reason.
2809 */
2810 retval = -EINVAL;
2811 goto err_add_udc;
2812 }
2813 }
2814
2815 for (i = 0; i < mod_data.num; i++) {
2816 retval = platform_device_add(the_udc_pdev[i]);
2817 if (retval < 0) {
2818 i--;
2819 while (i >= 0)
2820 platform_device_del(the_udc_pdev[i]);
2821 goto err_add_udc;
2822 }
2823 }
2824
2825 for (i = 0; i < mod_data.num; i++) {
2826 if (!platform_get_drvdata(the_udc_pdev[i])) {
2827 /*
2828 * The udc was added successfully but its probe
2829 * function failed for some reason.
2830 */
2831 retval = -EINVAL;
2832 goto err_probe_udc;
2833 }
2834 }
2835 return retval;
2836
2837 err_probe_udc:
2838 for (i = 0; i < mod_data.num; i++)
2839 platform_device_del(the_udc_pdev[i]);
2840 err_add_udc:
2841 for (i = 0; i < mod_data.num; i++)
2842 platform_device_del(the_hcd_pdev[i]);
2843 err_add_hcd:
2844 platform_driver_unregister(&dummy_udc_driver);
2845 err_register_udc_driver:
2846 platform_driver_unregister(&dummy_hcd_driver);
2847 err_add_pdata:
2848 for (i = 0; i < mod_data.num; i++)
2849 kfree(dum[i]);
2850 for (i = 0; i < mod_data.num; i++)
2851 platform_device_put(the_udc_pdev[i]);
2852 err_alloc_udc:
2853 for (i = 0; i < mod_data.num; i++)
2854 platform_device_put(the_hcd_pdev[i]);
2855 return retval;
2856 }
2857 module_init(init);
2858
2859 static void __exit cleanup(void)
2860 {
2861 int i;
2862
2863 for (i = 0; i < mod_data.num; i++) {
2864 struct dummy *dum;
2865
2866 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2867
2868 platform_device_unregister(the_udc_pdev[i]);
2869 platform_device_unregister(the_hcd_pdev[i]);
2870 kfree(dum);
2871 }
2872 platform_driver_unregister(&dummy_udc_driver);
2873 platform_driver_unregister(&dummy_hcd_driver);
2874 }
2875 module_exit(cleanup);
Linux with added FPC-III support