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 (device);
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
usb_ep_to_dummy_ep(struct usb_ep * _ep)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
usb_request_to_dummy_request(struct usb_request * _req)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("ep-aout",
191 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
192 EP_INFO("ep-bin",
193 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
194 EP_INFO("ep-cout",
195 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
196 EP_INFO("ep-dout",
197 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
198 EP_INFO("ep-ein",
199 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
200 EP_INFO("ep-fout",
201 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
202 EP_INFO("ep-gin",
203 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
204 EP_INFO("ep-hout",
205 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
206 EP_INFO("ep-iout",
207 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
208 EP_INFO("ep-jin",
209 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
210 EP_INFO("ep-kout",
211 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
212 EP_INFO("ep-lin",
213 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
214 EP_INFO("ep-mout",
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 * DEVICE/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 * HOST side support
280 */
281 struct dummy_hcd *hs_hcd;
282 struct dummy_hcd *ss_hcd;
283 };
284
hcd_to_dummy_hcd(struct usb_hcd * hcd)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
dummy_hcd_to_hcd(struct dummy_hcd * dum)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
dummy_dev(struct dummy_hcd * dum)295 static inline struct device *dummy_dev(struct dummy_hcd *dum)
296 {
297 return dummy_hcd_to_hcd(dum)->self.controller;
298 }
299
udc_dev(struct dummy * dum)300 static inline struct device *udc_dev(struct dummy *dum)
301 {
302 return dum->gadget.dev.parent;
303 }
304
ep_to_dummy(struct dummy_ep * ep)305 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
306 {
307 return container_of(ep->gadget, struct dummy, gadget);
308 }
309
gadget_to_dummy_hcd(struct usb_gadget * gadget)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
gadget_dev_to_dummy(struct device * dev)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 /* DEVICE/GADGET SIDE UTILITY ROUTINES */
327
328 /* called with spinlock held */
nuke(struct dummy * dum,struct dummy_ep * ep)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 */
stop_activity(struct dummy * dum)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 */
set_link_state_by_speed(struct dummy_hcd * dum_hcd)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 */
set_link_state(struct dummy_hcd * dum_hcd)429 static void set_link_state(struct dummy_hcd *dum_hcd)
430 __must_hold(&dum->lock)
431 {
432 struct dummy *dum = dum_hcd->dum;
433 unsigned int power_bit;
434
435 dum_hcd->active = 0;
436 if (dum->pullup)
437 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
438 dum->gadget.speed != USB_SPEED_SUPER) ||
439 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
440 dum->gadget.speed == USB_SPEED_SUPER))
441 return;
442
443 set_link_state_by_speed(dum_hcd);
444 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ?
445 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER);
446
447 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
448 dum_hcd->active)
449 dum_hcd->resuming = 0;
450
451 /* Currently !connected or in reset */
452 if ((dum_hcd->port_status & power_bit) == 0 ||
453 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
454 unsigned int disconnect = power_bit &
455 dum_hcd->old_status & (~dum_hcd->port_status);
456 unsigned int reset = USB_PORT_STAT_RESET &
457 (~dum_hcd->old_status) & dum_hcd->port_status;
458
459 /* Report reset and disconnect events to the driver */
460 if (dum->ints_enabled && (disconnect || reset)) {
461 stop_activity(dum);
462 ++dum->callback_usage;
463 spin_unlock(&dum->lock);
464 if (reset)
465 usb_gadget_udc_reset(&dum->gadget, dum->driver);
466 else
467 dum->driver->disconnect(&dum->gadget);
468 spin_lock(&dum->lock);
469 --dum->callback_usage;
470 }
471 } else if (dum_hcd->active != dum_hcd->old_active &&
472 dum->ints_enabled) {
473 ++dum->callback_usage;
474 spin_unlock(&dum->lock);
475 if (dum_hcd->old_active && dum->driver->suspend)
476 dum->driver->suspend(&dum->gadget);
477 else if (!dum_hcd->old_active && dum->driver->resume)
478 dum->driver->resume(&dum->gadget);
479 spin_lock(&dum->lock);
480 --dum->callback_usage;
481 }
482
483 dum_hcd->old_status = dum_hcd->port_status;
484 dum_hcd->old_active = dum_hcd->active;
485 }
486
487 /*-------------------------------------------------------------------------*/
488
489 /* DEVICE/GADGET SIDE DRIVER
490 *
491 * This only tracks gadget state. All the work is done when the host
492 * side tries some (emulated) i/o operation. Real device controller
493 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
494 */
495
496 #define is_enabled(dum) \
497 (dum->port_status & USB_PORT_STAT_ENABLE)
498
dummy_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)499 static int dummy_enable(struct usb_ep *_ep,
500 const struct usb_endpoint_descriptor *desc)
501 {
502 struct dummy *dum;
503 struct dummy_hcd *dum_hcd;
504 struct dummy_ep *ep;
505 unsigned max;
506 int retval;
507
508 ep = usb_ep_to_dummy_ep(_ep);
509 if (!_ep || !desc || ep->desc || _ep->name == ep0name
510 || desc->bDescriptorType != USB_DT_ENDPOINT)
511 return -EINVAL;
512 dum = ep_to_dummy(ep);
513 if (!dum->driver)
514 return -ESHUTDOWN;
515
516 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
517 if (!is_enabled(dum_hcd))
518 return -ESHUTDOWN;
519
520 /*
521 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
522 * maximum packet size.
523 * For SS devices the wMaxPacketSize is limited by 1024.
524 */
525 max = usb_endpoint_maxp(desc);
526
527 /* drivers must not request bad settings, since lower levels
528 * (hardware or its drivers) may not check. some endpoints
529 * can't do iso, many have maxpacket limitations, etc.
530 *
531 * since this "hardware" driver is here to help debugging, we
532 * have some extra sanity checks. (there could be more though,
533 * especially for "ep9out" style fixed function ones.)
534 */
535 retval = -EINVAL;
536 switch (usb_endpoint_type(desc)) {
537 case USB_ENDPOINT_XFER_BULK:
538 if (strstr(ep->ep.name, "-iso")
539 || strstr(ep->ep.name, "-int")) {
540 goto done;
541 }
542 switch (dum->gadget.speed) {
543 case USB_SPEED_SUPER:
544 if (max == 1024)
545 break;
546 goto done;
547 case USB_SPEED_HIGH:
548 if (max == 512)
549 break;
550 goto done;
551 case USB_SPEED_FULL:
552 if (max == 8 || max == 16 || max == 32 || max == 64)
553 /* we'll fake any legal size */
554 break;
555 /* save a return statement */
556 fallthrough;
557 default:
558 goto done;
559 }
560 break;
561 case USB_ENDPOINT_XFER_INT:
562 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
563 goto done;
564 /* real hardware might not handle all packet sizes */
565 switch (dum->gadget.speed) {
566 case USB_SPEED_SUPER:
567 case USB_SPEED_HIGH:
568 if (max <= 1024)
569 break;
570 /* save a return statement */
571 fallthrough;
572 case USB_SPEED_FULL:
573 if (max <= 64)
574 break;
575 /* save a return statement */
576 fallthrough;
577 default:
578 if (max <= 8)
579 break;
580 goto done;
581 }
582 break;
583 case USB_ENDPOINT_XFER_ISOC:
584 if (strstr(ep->ep.name, "-bulk")
585 || strstr(ep->ep.name, "-int"))
586 goto done;
587 /* real hardware might not handle all packet sizes */
588 switch (dum->gadget.speed) {
589 case USB_SPEED_SUPER:
590 case USB_SPEED_HIGH:
591 if (max <= 1024)
592 break;
593 /* save a return statement */
594 fallthrough;
595 case USB_SPEED_FULL:
596 if (max <= 1023)
597 break;
598 /* save a return statement */
599 fallthrough;
600 default:
601 goto done;
602 }
603 break;
604 default:
605 /* few chips support control except on ep0 */
606 goto done;
607 }
608
609 _ep->maxpacket = max;
610 if (usb_ss_max_streams(_ep->comp_desc)) {
611 if (!usb_endpoint_xfer_bulk(desc)) {
612 dev_err(udc_dev(dum), "Can't enable stream support on "
613 "non-bulk ep %s\n", _ep->name);
614 return -EINVAL;
615 }
616 ep->stream_en = 1;
617 }
618 ep->desc = desc;
619
620 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
621 _ep->name,
622 desc->bEndpointAddress & 0x0f,
623 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
624 usb_ep_type_string(usb_endpoint_type(desc)),
625 max, ep->stream_en ? "enabled" : "disabled");
626
627 /* at this point real hardware should be NAKing transfers
628 * to that endpoint, until a buffer is queued to it.
629 */
630 ep->halted = ep->wedged = 0;
631 retval = 0;
632 done:
633 return retval;
634 }
635
dummy_disable(struct usb_ep * _ep)636 static int dummy_disable(struct usb_ep *_ep)
637 {
638 struct dummy_ep *ep;
639 struct dummy *dum;
640 unsigned long flags;
641
642 ep = usb_ep_to_dummy_ep(_ep);
643 if (!_ep || !ep->desc || _ep->name == ep0name)
644 return -EINVAL;
645 dum = ep_to_dummy(ep);
646
647 spin_lock_irqsave(&dum->lock, flags);
648 ep->desc = NULL;
649 ep->stream_en = 0;
650 nuke(dum, ep);
651 spin_unlock_irqrestore(&dum->lock, flags);
652
653 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
654 return 0;
655 }
656
dummy_alloc_request(struct usb_ep * _ep,gfp_t mem_flags)657 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
658 gfp_t mem_flags)
659 {
660 struct dummy_request *req;
661
662 if (!_ep)
663 return NULL;
664
665 req = kzalloc(sizeof(*req), mem_flags);
666 if (!req)
667 return NULL;
668 INIT_LIST_HEAD(&req->queue);
669 return &req->req;
670 }
671
dummy_free_request(struct usb_ep * _ep,struct usb_request * _req)672 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
673 {
674 struct dummy_request *req;
675
676 if (!_ep || !_req) {
677 WARN_ON(1);
678 return;
679 }
680
681 req = usb_request_to_dummy_request(_req);
682 WARN_ON(!list_empty(&req->queue));
683 kfree(req);
684 }
685
fifo_complete(struct usb_ep * ep,struct usb_request * req)686 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
687 {
688 }
689
dummy_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t mem_flags)690 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
691 gfp_t mem_flags)
692 {
693 struct dummy_ep *ep;
694 struct dummy_request *req;
695 struct dummy *dum;
696 struct dummy_hcd *dum_hcd;
697 unsigned long flags;
698
699 req = usb_request_to_dummy_request(_req);
700 if (!_req || !list_empty(&req->queue) || !_req->complete)
701 return -EINVAL;
702
703 ep = usb_ep_to_dummy_ep(_ep);
704 if (!_ep || (!ep->desc && _ep->name != ep0name))
705 return -EINVAL;
706
707 dum = ep_to_dummy(ep);
708 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
709 if (!dum->driver || !is_enabled(dum_hcd))
710 return -ESHUTDOWN;
711
712 #if 0
713 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
714 ep, _req, _ep->name, _req->length, _req->buf);
715 #endif
716 _req->status = -EINPROGRESS;
717 _req->actual = 0;
718 spin_lock_irqsave(&dum->lock, flags);
719
720 /* implement an emulated single-request FIFO */
721 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
722 list_empty(&dum->fifo_req.queue) &&
723 list_empty(&ep->queue) &&
724 _req->length <= FIFO_SIZE) {
725 req = &dum->fifo_req;
726 req->req = *_req;
727 req->req.buf = dum->fifo_buf;
728 memcpy(dum->fifo_buf, _req->buf, _req->length);
729 req->req.context = dum;
730 req->req.complete = fifo_complete;
731
732 list_add_tail(&req->queue, &ep->queue);
733 spin_unlock(&dum->lock);
734 _req->actual = _req->length;
735 _req->status = 0;
736 usb_gadget_giveback_request(_ep, _req);
737 spin_lock(&dum->lock);
738 } else
739 list_add_tail(&req->queue, &ep->queue);
740 spin_unlock_irqrestore(&dum->lock, flags);
741
742 /* real hardware would likely enable transfers here, in case
743 * it'd been left NAKing.
744 */
745 return 0;
746 }
747
dummy_dequeue(struct usb_ep * _ep,struct usb_request * _req)748 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
749 {
750 struct dummy_ep *ep;
751 struct dummy *dum;
752 int retval = -EINVAL;
753 unsigned long flags;
754 struct dummy_request *req = NULL, *iter;
755
756 if (!_ep || !_req)
757 return retval;
758 ep = usb_ep_to_dummy_ep(_ep);
759 dum = ep_to_dummy(ep);
760
761 if (!dum->driver)
762 return -ESHUTDOWN;
763
764 local_irq_save(flags);
765 spin_lock(&dum->lock);
766 list_for_each_entry(iter, &ep->queue, queue) {
767 if (&iter->req != _req)
768 continue;
769 list_del_init(&iter->queue);
770 _req->status = -ECONNRESET;
771 req = iter;
772 retval = 0;
773 break;
774 }
775 spin_unlock(&dum->lock);
776
777 if (retval == 0) {
778 dev_dbg(udc_dev(dum),
779 "dequeued req %p from %s, len %d buf %p\n",
780 req, _ep->name, _req->length, _req->buf);
781 usb_gadget_giveback_request(_ep, _req);
782 }
783 local_irq_restore(flags);
784 return retval;
785 }
786
787 static int
dummy_set_halt_and_wedge(struct usb_ep * _ep,int value,int wedged)788 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
789 {
790 struct dummy_ep *ep;
791 struct dummy *dum;
792
793 if (!_ep)
794 return -EINVAL;
795 ep = usb_ep_to_dummy_ep(_ep);
796 dum = ep_to_dummy(ep);
797 if (!dum->driver)
798 return -ESHUTDOWN;
799 if (!value)
800 ep->halted = ep->wedged = 0;
801 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
802 !list_empty(&ep->queue))
803 return -EAGAIN;
804 else {
805 ep->halted = 1;
806 if (wedged)
807 ep->wedged = 1;
808 }
809 /* FIXME clear emulated data toggle too */
810 return 0;
811 }
812
813 static int
dummy_set_halt(struct usb_ep * _ep,int value)814 dummy_set_halt(struct usb_ep *_ep, int value)
815 {
816 return dummy_set_halt_and_wedge(_ep, value, 0);
817 }
818
dummy_set_wedge(struct usb_ep * _ep)819 static int dummy_set_wedge(struct usb_ep *_ep)
820 {
821 if (!_ep || _ep->name == ep0name)
822 return -EINVAL;
823 return dummy_set_halt_and_wedge(_ep, 1, 1);
824 }
825
826 static const struct usb_ep_ops dummy_ep_ops = {
827 .enable = dummy_enable,
828 .disable = dummy_disable,
829
830 .alloc_request = dummy_alloc_request,
831 .free_request = dummy_free_request,
832
833 .queue = dummy_queue,
834 .dequeue = dummy_dequeue,
835
836 .set_halt = dummy_set_halt,
837 .set_wedge = dummy_set_wedge,
838 };
839
840 /*-------------------------------------------------------------------------*/
841
842 /* there are both host and device side versions of this call ... */
dummy_g_get_frame(struct usb_gadget * _gadget)843 static int dummy_g_get_frame(struct usb_gadget *_gadget)
844 {
845 struct timespec64 ts64;
846
847 ktime_get_ts64(&ts64);
848 return ts64.tv_nsec / NSEC_PER_MSEC;
849 }
850
dummy_wakeup(struct usb_gadget * _gadget)851 static int dummy_wakeup(struct usb_gadget *_gadget)
852 {
853 struct dummy_hcd *dum_hcd;
854
855 dum_hcd = gadget_to_dummy_hcd(_gadget);
856 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
857 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
858 return -EINVAL;
859 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
860 return -ENOLINK;
861 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
862 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
863 return -EIO;
864
865 /* FIXME: What if the root hub is suspended but the port isn't? */
866
867 /* hub notices our request, issues downstream resume, etc */
868 dum_hcd->resuming = 1;
869 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
870 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
871 return 0;
872 }
873
dummy_set_selfpowered(struct usb_gadget * _gadget,int value)874 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
875 {
876 struct dummy *dum;
877
878 _gadget->is_selfpowered = (value != 0);
879 dum = gadget_to_dummy_hcd(_gadget)->dum;
880 if (value)
881 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
882 else
883 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
884 return 0;
885 }
886
dummy_udc_update_ep0(struct dummy * dum)887 static void dummy_udc_update_ep0(struct dummy *dum)
888 {
889 if (dum->gadget.speed == USB_SPEED_SUPER)
890 dum->ep[0].ep.maxpacket = 9;
891 else
892 dum->ep[0].ep.maxpacket = 64;
893 }
894
dummy_pullup(struct usb_gadget * _gadget,int value)895 static int dummy_pullup(struct usb_gadget *_gadget, int value)
896 {
897 struct dummy_hcd *dum_hcd;
898 struct dummy *dum;
899 unsigned long flags;
900
901 dum = gadget_dev_to_dummy(&_gadget->dev);
902 dum_hcd = gadget_to_dummy_hcd(_gadget);
903
904 spin_lock_irqsave(&dum->lock, flags);
905 dum->pullup = (value != 0);
906 set_link_state(dum_hcd);
907 if (value == 0) {
908 /*
909 * Emulate synchronize_irq(): wait for callbacks to finish.
910 * This seems to be the best place to emulate the call to
911 * synchronize_irq() that's in usb_gadget_remove_driver().
912 * Doing it in dummy_udc_stop() would be too late since it
913 * is called after the unbind callback and unbind shouldn't
914 * be invoked until all the other callbacks are finished.
915 */
916 while (dum->callback_usage > 0) {
917 spin_unlock_irqrestore(&dum->lock, flags);
918 usleep_range(1000, 2000);
919 spin_lock_irqsave(&dum->lock, flags);
920 }
921 }
922 spin_unlock_irqrestore(&dum->lock, flags);
923
924 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
925 return 0;
926 }
927
dummy_udc_set_speed(struct usb_gadget * _gadget,enum usb_device_speed speed)928 static void dummy_udc_set_speed(struct usb_gadget *_gadget,
929 enum usb_device_speed speed)
930 {
931 struct dummy *dum;
932
933 dum = gadget_dev_to_dummy(&_gadget->dev);
934 dum->gadget.speed = speed;
935 dummy_udc_update_ep0(dum);
936 }
937
dummy_udc_async_callbacks(struct usb_gadget * _gadget,bool enable)938 static void dummy_udc_async_callbacks(struct usb_gadget *_gadget, bool enable)
939 {
940 struct dummy *dum = gadget_dev_to_dummy(&_gadget->dev);
941
942 spin_lock_irq(&dum->lock);
943 dum->ints_enabled = enable;
944 spin_unlock_irq(&dum->lock);
945 }
946
947 static int dummy_udc_start(struct usb_gadget *g,
948 struct usb_gadget_driver *driver);
949 static int dummy_udc_stop(struct usb_gadget *g);
950
951 static const struct usb_gadget_ops dummy_ops = {
952 .get_frame = dummy_g_get_frame,
953 .wakeup = dummy_wakeup,
954 .set_selfpowered = dummy_set_selfpowered,
955 .pullup = dummy_pullup,
956 .udc_start = dummy_udc_start,
957 .udc_stop = dummy_udc_stop,
958 .udc_set_speed = dummy_udc_set_speed,
959 .udc_async_callbacks = dummy_udc_async_callbacks,
960 };
961
962 /*-------------------------------------------------------------------------*/
963
964 /* "function" sysfs attribute */
function_show(struct device * dev,struct device_attribute * attr,char * buf)965 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
966 char *buf)
967 {
968 struct dummy *dum = gadget_dev_to_dummy(dev);
969
970 if (!dum->driver || !dum->driver->function)
971 return 0;
972 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
973 }
974 static DEVICE_ATTR_RO(function);
975
976 /*-------------------------------------------------------------------------*/
977
978 /*
979 * Driver registration/unregistration.
980 *
981 * This is basically hardware-specific; there's usually only one real USB
982 * device (not host) controller since that's how USB devices are intended
983 * to work. So most implementations of these api calls will rely on the
984 * fact that only one driver will ever bind to the hardware. But curious
985 * hardware can be built with discrete components, so the gadget API doesn't
986 * require that assumption.
987 *
988 * For this emulator, it might be convenient to create a usb device
989 * for each driver that registers: just add to a big root hub.
990 */
991
dummy_udc_start(struct usb_gadget * g,struct usb_gadget_driver * driver)992 static int dummy_udc_start(struct usb_gadget *g,
993 struct usb_gadget_driver *driver)
994 {
995 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
996 struct dummy *dum = dum_hcd->dum;
997
998 switch (g->speed) {
999 /* All the speeds we support */
1000 case USB_SPEED_LOW:
1001 case USB_SPEED_FULL:
1002 case USB_SPEED_HIGH:
1003 case USB_SPEED_SUPER:
1004 break;
1005 default:
1006 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n",
1007 driver->max_speed);
1008 return -EINVAL;
1009 }
1010
1011 /*
1012 * DEVICE side init ... the layer above hardware, which
1013 * can't enumerate without help from the driver we're binding.
1014 */
1015
1016 spin_lock_irq(&dum->lock);
1017 dum->devstatus = 0;
1018 dum->driver = driver;
1019 spin_unlock_irq(&dum->lock);
1020
1021 return 0;
1022 }
1023
dummy_udc_stop(struct usb_gadget * g)1024 static int dummy_udc_stop(struct usb_gadget *g)
1025 {
1026 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
1027 struct dummy *dum = dum_hcd->dum;
1028
1029 spin_lock_irq(&dum->lock);
1030 dum->ints_enabled = 0;
1031 stop_activity(dum);
1032 dum->driver = NULL;
1033 spin_unlock_irq(&dum->lock);
1034
1035 return 0;
1036 }
1037
1038 #undef is_enabled
1039
1040 /* The gadget structure is stored inside the hcd structure and will be
1041 * released along with it. */
init_dummy_udc_hw(struct dummy * dum)1042 static void init_dummy_udc_hw(struct dummy *dum)
1043 {
1044 int i;
1045
1046 INIT_LIST_HEAD(&dum->gadget.ep_list);
1047 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1048 struct dummy_ep *ep = &dum->ep[i];
1049
1050 if (!ep_info[i].name)
1051 break;
1052 ep->ep.name = ep_info[i].name;
1053 ep->ep.caps = ep_info[i].caps;
1054 ep->ep.ops = &dummy_ep_ops;
1055 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1056 ep->halted = ep->wedged = ep->already_seen =
1057 ep->setup_stage = 0;
1058 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1059 ep->ep.max_streams = 16;
1060 ep->last_io = jiffies;
1061 ep->gadget = &dum->gadget;
1062 ep->desc = NULL;
1063 INIT_LIST_HEAD(&ep->queue);
1064 }
1065
1066 dum->gadget.ep0 = &dum->ep[0].ep;
1067 list_del_init(&dum->ep[0].ep.ep_list);
1068 INIT_LIST_HEAD(&dum->fifo_req.queue);
1069
1070 #ifdef CONFIG_USB_OTG
1071 dum->gadget.is_otg = 1;
1072 #endif
1073 }
1074
dummy_udc_probe(struct platform_device * pdev)1075 static int dummy_udc_probe(struct platform_device *pdev)
1076 {
1077 struct dummy *dum;
1078 int rc;
1079
1080 dum = *((void **)dev_get_platdata(&pdev->dev));
1081 /* Clear usb_gadget region for new registration to udc-core */
1082 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1083 dum->gadget.name = gadget_name;
1084 dum->gadget.ops = &dummy_ops;
1085 if (mod_data.is_super_speed)
1086 dum->gadget.max_speed = USB_SPEED_SUPER;
1087 else if (mod_data.is_high_speed)
1088 dum->gadget.max_speed = USB_SPEED_HIGH;
1089 else
1090 dum->gadget.max_speed = USB_SPEED_FULL;
1091
1092 dum->gadget.dev.parent = &pdev->dev;
1093 init_dummy_udc_hw(dum);
1094
1095 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1096 if (rc < 0)
1097 goto err_udc;
1098
1099 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1100 if (rc < 0)
1101 goto err_dev;
1102 platform_set_drvdata(pdev, dum);
1103 return rc;
1104
1105 err_dev:
1106 usb_del_gadget_udc(&dum->gadget);
1107 err_udc:
1108 return rc;
1109 }
1110
dummy_udc_remove(struct platform_device * pdev)1111 static void dummy_udc_remove(struct platform_device *pdev)
1112 {
1113 struct dummy *dum = platform_get_drvdata(pdev);
1114
1115 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1116 usb_del_gadget_udc(&dum->gadget);
1117 }
1118
dummy_udc_pm(struct dummy * dum,struct dummy_hcd * dum_hcd,int suspend)1119 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1120 int suspend)
1121 {
1122 spin_lock_irq(&dum->lock);
1123 dum->udc_suspended = suspend;
1124 set_link_state(dum_hcd);
1125 spin_unlock_irq(&dum->lock);
1126 }
1127
dummy_udc_suspend(struct platform_device * pdev,pm_message_t state)1128 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1129 {
1130 struct dummy *dum = platform_get_drvdata(pdev);
1131 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1132
1133 dev_dbg(&pdev->dev, "%s\n", __func__);
1134 dummy_udc_pm(dum, dum_hcd, 1);
1135 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1136 return 0;
1137 }
1138
dummy_udc_resume(struct platform_device * pdev)1139 static int dummy_udc_resume(struct platform_device *pdev)
1140 {
1141 struct dummy *dum = platform_get_drvdata(pdev);
1142 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1143
1144 dev_dbg(&pdev->dev, "%s\n", __func__);
1145 dummy_udc_pm(dum, dum_hcd, 0);
1146 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1147 return 0;
1148 }
1149
1150 static struct platform_driver dummy_udc_driver = {
1151 .probe = dummy_udc_probe,
1152 .remove_new = dummy_udc_remove,
1153 .suspend = dummy_udc_suspend,
1154 .resume = dummy_udc_resume,
1155 .driver = {
1156 .name = gadget_name,
1157 },
1158 };
1159
1160 /*-------------------------------------------------------------------------*/
1161
dummy_get_ep_idx(const struct usb_endpoint_descriptor * desc)1162 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1163 {
1164 unsigned int index;
1165
1166 index = usb_endpoint_num(desc) << 1;
1167 if (usb_endpoint_dir_in(desc))
1168 index |= 1;
1169 return index;
1170 }
1171
1172 /* HOST SIDE DRIVER
1173 *
1174 * this uses the hcd framework to hook up to host side drivers.
1175 * its root hub will only have one device, otherwise it acts like
1176 * a normal host controller.
1177 *
1178 * when urbs are queued, they're just stuck on a list that we
1179 * scan in a timer callback. that callback connects writes from
1180 * the host with reads from the device, and so on, based on the
1181 * usb 2.0 rules.
1182 */
1183
dummy_ep_stream_en(struct dummy_hcd * dum_hcd,struct urb * urb)1184 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1185 {
1186 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1187 u32 index;
1188
1189 if (!usb_endpoint_xfer_bulk(desc))
1190 return 0;
1191
1192 index = dummy_get_ep_idx(desc);
1193 return (1 << index) & dum_hcd->stream_en_ep;
1194 }
1195
1196 /*
1197 * The max stream number is saved as a nibble so for the 30 possible endpoints
1198 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1199 * means we use only 1 stream). The maximum according to the spec is 16bit so
1200 * if the 16 stream limit is about to go, the array size should be incremented
1201 * to 30 elements of type u16.
1202 */
get_max_streams_for_pipe(struct dummy_hcd * dum_hcd,unsigned int pipe)1203 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1204 unsigned int pipe)
1205 {
1206 int max_streams;
1207
1208 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1209 if (usb_pipeout(pipe))
1210 max_streams >>= 4;
1211 else
1212 max_streams &= 0xf;
1213 max_streams++;
1214 return max_streams;
1215 }
1216
set_max_streams_for_pipe(struct dummy_hcd * dum_hcd,unsigned int pipe,unsigned int streams)1217 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1218 unsigned int pipe, unsigned int streams)
1219 {
1220 int max_streams;
1221
1222 streams--;
1223 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1224 if (usb_pipeout(pipe)) {
1225 streams <<= 4;
1226 max_streams &= 0xf;
1227 } else {
1228 max_streams &= 0xf0;
1229 }
1230 max_streams |= streams;
1231 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1232 }
1233
dummy_validate_stream(struct dummy_hcd * dum_hcd,struct urb * urb)1234 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1235 {
1236 unsigned int max_streams;
1237 int enabled;
1238
1239 enabled = dummy_ep_stream_en(dum_hcd, urb);
1240 if (!urb->stream_id) {
1241 if (enabled)
1242 return -EINVAL;
1243 return 0;
1244 }
1245 if (!enabled)
1246 return -EINVAL;
1247
1248 max_streams = get_max_streams_for_pipe(dum_hcd,
1249 usb_pipeendpoint(urb->pipe));
1250 if (urb->stream_id > max_streams) {
1251 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1252 urb->stream_id);
1253 BUG();
1254 return -EINVAL;
1255 }
1256 return 0;
1257 }
1258
dummy_urb_enqueue(struct usb_hcd * hcd,struct urb * urb,gfp_t mem_flags)1259 static int dummy_urb_enqueue(
1260 struct usb_hcd *hcd,
1261 struct urb *urb,
1262 gfp_t mem_flags
1263 ) {
1264 struct dummy_hcd *dum_hcd;
1265 struct urbp *urbp;
1266 unsigned long flags;
1267 int rc;
1268
1269 urbp = kmalloc(sizeof *urbp, mem_flags);
1270 if (!urbp)
1271 return -ENOMEM;
1272 urbp->urb = urb;
1273 urbp->miter_started = 0;
1274
1275 dum_hcd = hcd_to_dummy_hcd(hcd);
1276 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1277
1278 rc = dummy_validate_stream(dum_hcd, urb);
1279 if (rc) {
1280 kfree(urbp);
1281 goto done;
1282 }
1283
1284 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1285 if (rc) {
1286 kfree(urbp);
1287 goto done;
1288 }
1289
1290 if (!dum_hcd->udev) {
1291 dum_hcd->udev = urb->dev;
1292 usb_get_dev(dum_hcd->udev);
1293 } else if (unlikely(dum_hcd->udev != urb->dev))
1294 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1295
1296 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1297 urb->hcpriv = urbp;
1298 if (!dum_hcd->next_frame_urbp)
1299 dum_hcd->next_frame_urbp = urbp;
1300 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1301 urb->error_count = 1; /* mark as a new urb */
1302
1303 /* kick the scheduler, it'll do the rest */
1304 if (!timer_pending(&dum_hcd->timer))
1305 mod_timer(&dum_hcd->timer, jiffies + 1);
1306
1307 done:
1308 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1309 return rc;
1310 }
1311
dummy_urb_dequeue(struct usb_hcd * hcd,struct urb * urb,int status)1312 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1313 {
1314 struct dummy_hcd *dum_hcd;
1315 unsigned long flags;
1316 int rc;
1317
1318 /* giveback happens automatically in timer callback,
1319 * so make sure the callback happens */
1320 dum_hcd = hcd_to_dummy_hcd(hcd);
1321 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1322
1323 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1324 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1325 !list_empty(&dum_hcd->urbp_list))
1326 mod_timer(&dum_hcd->timer, jiffies);
1327
1328 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1329 return rc;
1330 }
1331
dummy_perform_transfer(struct urb * urb,struct dummy_request * req,u32 len)1332 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1333 u32 len)
1334 {
1335 void *ubuf, *rbuf;
1336 struct urbp *urbp = urb->hcpriv;
1337 int to_host;
1338 struct sg_mapping_iter *miter = &urbp->miter;
1339 u32 trans = 0;
1340 u32 this_sg;
1341 bool next_sg;
1342
1343 to_host = usb_urb_dir_in(urb);
1344 rbuf = req->req.buf + req->req.actual;
1345
1346 if (!urb->num_sgs) {
1347 ubuf = urb->transfer_buffer + urb->actual_length;
1348 if (to_host)
1349 memcpy(ubuf, rbuf, len);
1350 else
1351 memcpy(rbuf, ubuf, len);
1352 return len;
1353 }
1354
1355 if (!urbp->miter_started) {
1356 u32 flags = SG_MITER_ATOMIC;
1357
1358 if (to_host)
1359 flags |= SG_MITER_TO_SG;
1360 else
1361 flags |= SG_MITER_FROM_SG;
1362
1363 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1364 urbp->miter_started = 1;
1365 }
1366 next_sg = sg_miter_next(miter);
1367 if (next_sg == false) {
1368 WARN_ON_ONCE(1);
1369 return -EINVAL;
1370 }
1371 do {
1372 ubuf = miter->addr;
1373 this_sg = min_t(u32, len, miter->length);
1374 miter->consumed = this_sg;
1375 trans += this_sg;
1376
1377 if (to_host)
1378 memcpy(ubuf, rbuf, this_sg);
1379 else
1380 memcpy(rbuf, ubuf, this_sg);
1381 len -= this_sg;
1382
1383 if (!len)
1384 break;
1385 next_sg = sg_miter_next(miter);
1386 if (next_sg == false) {
1387 WARN_ON_ONCE(1);
1388 return -EINVAL;
1389 }
1390
1391 rbuf += this_sg;
1392 } while (1);
1393
1394 sg_miter_stop(miter);
1395 return trans;
1396 }
1397
1398 /* transfer up to a frame's worth; caller must own lock */
transfer(struct dummy_hcd * dum_hcd,struct urb * urb,struct dummy_ep * ep,int limit,int * status)1399 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1400 struct dummy_ep *ep, int limit, int *status)
1401 {
1402 struct dummy *dum = dum_hcd->dum;
1403 struct dummy_request *req;
1404 int sent = 0;
1405
1406 top:
1407 /* if there's no request queued, the device is NAKing; return */
1408 list_for_each_entry(req, &ep->queue, queue) {
1409 unsigned host_len, dev_len, len;
1410 int is_short, to_host;
1411 int rescan = 0;
1412
1413 if (dummy_ep_stream_en(dum_hcd, urb)) {
1414 if ((urb->stream_id != req->req.stream_id))
1415 continue;
1416 }
1417
1418 /* 1..N packets of ep->ep.maxpacket each ... the last one
1419 * may be short (including zero length).
1420 *
1421 * writer can send a zlp explicitly (length 0) or implicitly
1422 * (length mod maxpacket zero, and 'zero' flag); they always
1423 * terminate reads.
1424 */
1425 host_len = urb->transfer_buffer_length - urb->actual_length;
1426 dev_len = req->req.length - req->req.actual;
1427 len = min(host_len, dev_len);
1428
1429 /* FIXME update emulated data toggle too */
1430
1431 to_host = usb_urb_dir_in(urb);
1432 if (unlikely(len == 0))
1433 is_short = 1;
1434 else {
1435 /* not enough bandwidth left? */
1436 if (limit < ep->ep.maxpacket && limit < len)
1437 break;
1438 len = min_t(unsigned, len, limit);
1439 if (len == 0)
1440 break;
1441
1442 /* send multiple of maxpacket first, then remainder */
1443 if (len >= ep->ep.maxpacket) {
1444 is_short = 0;
1445 if (len % ep->ep.maxpacket)
1446 rescan = 1;
1447 len -= len % ep->ep.maxpacket;
1448 } else {
1449 is_short = 1;
1450 }
1451
1452 len = dummy_perform_transfer(urb, req, len);
1453
1454 ep->last_io = jiffies;
1455 if ((int)len < 0) {
1456 req->req.status = len;
1457 } else {
1458 limit -= len;
1459 sent += len;
1460 urb->actual_length += len;
1461 req->req.actual += len;
1462 }
1463 }
1464
1465 /* short packets terminate, maybe with overflow/underflow.
1466 * it's only really an error to write too much.
1467 *
1468 * partially filling a buffer optionally blocks queue advances
1469 * (so completion handlers can clean up the queue) but we don't
1470 * need to emulate such data-in-flight.
1471 */
1472 if (is_short) {
1473 if (host_len == dev_len) {
1474 req->req.status = 0;
1475 *status = 0;
1476 } else if (to_host) {
1477 req->req.status = 0;
1478 if (dev_len > host_len)
1479 *status = -EOVERFLOW;
1480 else
1481 *status = 0;
1482 } else {
1483 *status = 0;
1484 if (host_len > dev_len)
1485 req->req.status = -EOVERFLOW;
1486 else
1487 req->req.status = 0;
1488 }
1489
1490 /*
1491 * many requests terminate without a short packet.
1492 * send a zlp if demanded by flags.
1493 */
1494 } else {
1495 if (req->req.length == req->req.actual) {
1496 if (req->req.zero && to_host)
1497 rescan = 1;
1498 else
1499 req->req.status = 0;
1500 }
1501 if (urb->transfer_buffer_length == urb->actual_length) {
1502 if (urb->transfer_flags & URB_ZERO_PACKET &&
1503 !to_host)
1504 rescan = 1;
1505 else
1506 *status = 0;
1507 }
1508 }
1509
1510 /* device side completion --> continuable */
1511 if (req->req.status != -EINPROGRESS) {
1512 list_del_init(&req->queue);
1513
1514 spin_unlock(&dum->lock);
1515 usb_gadget_giveback_request(&ep->ep, &req->req);
1516 spin_lock(&dum->lock);
1517
1518 /* requests might have been unlinked... */
1519 rescan = 1;
1520 }
1521
1522 /* host side completion --> terminate */
1523 if (*status != -EINPROGRESS)
1524 break;
1525
1526 /* rescan to continue with any other queued i/o */
1527 if (rescan)
1528 goto top;
1529 }
1530 return sent;
1531 }
1532
periodic_bytes(struct dummy * dum,struct dummy_ep * ep)1533 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1534 {
1535 int limit = ep->ep.maxpacket;
1536
1537 if (dum->gadget.speed == USB_SPEED_HIGH) {
1538 int tmp;
1539
1540 /* high bandwidth mode */
1541 tmp = usb_endpoint_maxp_mult(ep->desc);
1542 tmp *= 8 /* applies to entire frame */;
1543 limit += limit * tmp;
1544 }
1545 if (dum->gadget.speed == USB_SPEED_SUPER) {
1546 switch (usb_endpoint_type(ep->desc)) {
1547 case USB_ENDPOINT_XFER_ISOC:
1548 /* Sec. 4.4.8.2 USB3.0 Spec */
1549 limit = 3 * 16 * 1024 * 8;
1550 break;
1551 case USB_ENDPOINT_XFER_INT:
1552 /* Sec. 4.4.7.2 USB3.0 Spec */
1553 limit = 3 * 1024 * 8;
1554 break;
1555 case USB_ENDPOINT_XFER_BULK:
1556 default:
1557 break;
1558 }
1559 }
1560 return limit;
1561 }
1562
1563 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1564 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1565 USB_PORT_STAT_SUSPEND)) \
1566 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1567
find_endpoint(struct dummy * dum,u8 address)1568 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1569 {
1570 int i;
1571
1572 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1573 dum->ss_hcd : dum->hs_hcd)))
1574 return NULL;
1575 if (!dum->ints_enabled)
1576 return NULL;
1577 if ((address & ~USB_DIR_IN) == 0)
1578 return &dum->ep[0];
1579 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1580 struct dummy_ep *ep = &dum->ep[i];
1581
1582 if (!ep->desc)
1583 continue;
1584 if (ep->desc->bEndpointAddress == address)
1585 return ep;
1586 }
1587 return NULL;
1588 }
1589
1590 #undef is_active
1591
1592 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1593 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1594 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1595 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1596 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1597 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1598
1599
1600 /**
1601 * handle_control_request() - handles all control transfers
1602 * @dum_hcd: pointer to dummy (the_controller)
1603 * @urb: the urb request to handle
1604 * @setup: pointer to the setup data for a USB device control
1605 * request
1606 * @status: pointer to request handling status
1607 *
1608 * Return 0 - if the request was handled
1609 * 1 - if the request wasn't handles
1610 * error code on error
1611 */
handle_control_request(struct dummy_hcd * dum_hcd,struct urb * urb,struct usb_ctrlrequest * setup,int * status)1612 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1613 struct usb_ctrlrequest *setup,
1614 int *status)
1615 {
1616 struct dummy_ep *ep2;
1617 struct dummy *dum = dum_hcd->dum;
1618 int ret_val = 1;
1619 unsigned w_index;
1620 unsigned w_value;
1621
1622 w_index = le16_to_cpu(setup->wIndex);
1623 w_value = le16_to_cpu(setup->wValue);
1624 switch (setup->bRequest) {
1625 case USB_REQ_SET_ADDRESS:
1626 if (setup->bRequestType != Dev_Request)
1627 break;
1628 dum->address = w_value;
1629 *status = 0;
1630 dev_dbg(udc_dev(dum), "set_address = %d\n",
1631 w_value);
1632 ret_val = 0;
1633 break;
1634 case USB_REQ_SET_FEATURE:
1635 if (setup->bRequestType == Dev_Request) {
1636 ret_val = 0;
1637 switch (w_value) {
1638 case USB_DEVICE_REMOTE_WAKEUP:
1639 break;
1640 case USB_DEVICE_B_HNP_ENABLE:
1641 dum->gadget.b_hnp_enable = 1;
1642 break;
1643 case USB_DEVICE_A_HNP_SUPPORT:
1644 dum->gadget.a_hnp_support = 1;
1645 break;
1646 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1647 dum->gadget.a_alt_hnp_support = 1;
1648 break;
1649 case USB_DEVICE_U1_ENABLE:
1650 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1651 HCD_USB3)
1652 w_value = USB_DEV_STAT_U1_ENABLED;
1653 else
1654 ret_val = -EOPNOTSUPP;
1655 break;
1656 case USB_DEVICE_U2_ENABLE:
1657 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1658 HCD_USB3)
1659 w_value = USB_DEV_STAT_U2_ENABLED;
1660 else
1661 ret_val = -EOPNOTSUPP;
1662 break;
1663 case USB_DEVICE_LTM_ENABLE:
1664 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1665 HCD_USB3)
1666 w_value = USB_DEV_STAT_LTM_ENABLED;
1667 else
1668 ret_val = -EOPNOTSUPP;
1669 break;
1670 default:
1671 ret_val = -EOPNOTSUPP;
1672 }
1673 if (ret_val == 0) {
1674 dum->devstatus |= (1 << w_value);
1675 *status = 0;
1676 }
1677 } else if (setup->bRequestType == Ep_Request) {
1678 /* endpoint halt */
1679 ep2 = find_endpoint(dum, w_index);
1680 if (!ep2 || ep2->ep.name == ep0name) {
1681 ret_val = -EOPNOTSUPP;
1682 break;
1683 }
1684 ep2->halted = 1;
1685 ret_val = 0;
1686 *status = 0;
1687 }
1688 break;
1689 case USB_REQ_CLEAR_FEATURE:
1690 if (setup->bRequestType == Dev_Request) {
1691 ret_val = 0;
1692 switch (w_value) {
1693 case USB_DEVICE_REMOTE_WAKEUP:
1694 w_value = USB_DEVICE_REMOTE_WAKEUP;
1695 break;
1696 case USB_DEVICE_U1_ENABLE:
1697 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1698 HCD_USB3)
1699 w_value = USB_DEV_STAT_U1_ENABLED;
1700 else
1701 ret_val = -EOPNOTSUPP;
1702 break;
1703 case USB_DEVICE_U2_ENABLE:
1704 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1705 HCD_USB3)
1706 w_value = USB_DEV_STAT_U2_ENABLED;
1707 else
1708 ret_val = -EOPNOTSUPP;
1709 break;
1710 case USB_DEVICE_LTM_ENABLE:
1711 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1712 HCD_USB3)
1713 w_value = USB_DEV_STAT_LTM_ENABLED;
1714 else
1715 ret_val = -EOPNOTSUPP;
1716 break;
1717 default:
1718 ret_val = -EOPNOTSUPP;
1719 break;
1720 }
1721 if (ret_val == 0) {
1722 dum->devstatus &= ~(1 << w_value);
1723 *status = 0;
1724 }
1725 } else if (setup->bRequestType == Ep_Request) {
1726 /* endpoint halt */
1727 ep2 = find_endpoint(dum, w_index);
1728 if (!ep2) {
1729 ret_val = -EOPNOTSUPP;
1730 break;
1731 }
1732 if (!ep2->wedged)
1733 ep2->halted = 0;
1734 ret_val = 0;
1735 *status = 0;
1736 }
1737 break;
1738 case USB_REQ_GET_STATUS:
1739 if (setup->bRequestType == Dev_InRequest
1740 || setup->bRequestType == Intf_InRequest
1741 || setup->bRequestType == Ep_InRequest) {
1742 char *buf;
1743 /*
1744 * device: remote wakeup, selfpowered
1745 * interface: nothing
1746 * endpoint: halt
1747 */
1748 buf = (char *)urb->transfer_buffer;
1749 if (urb->transfer_buffer_length > 0) {
1750 if (setup->bRequestType == Ep_InRequest) {
1751 ep2 = find_endpoint(dum, w_index);
1752 if (!ep2) {
1753 ret_val = -EOPNOTSUPP;
1754 break;
1755 }
1756 buf[0] = ep2->halted;
1757 } else if (setup->bRequestType ==
1758 Dev_InRequest) {
1759 buf[0] = (u8)dum->devstatus;
1760 } else
1761 buf[0] = 0;
1762 }
1763 if (urb->transfer_buffer_length > 1)
1764 buf[1] = 0;
1765 urb->actual_length = min_t(u32, 2,
1766 urb->transfer_buffer_length);
1767 ret_val = 0;
1768 *status = 0;
1769 }
1770 break;
1771 }
1772 return ret_val;
1773 }
1774
1775 /*
1776 * Drive both sides of the transfers; looks like irq handlers to both
1777 * drivers except that the callbacks are invoked from soft interrupt
1778 * context.
1779 */
dummy_timer(struct timer_list * t)1780 static void dummy_timer(struct timer_list *t)
1781 {
1782 struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer);
1783 struct dummy *dum = dum_hcd->dum;
1784 struct urbp *urbp, *tmp;
1785 unsigned long flags;
1786 int limit, total;
1787 int i;
1788
1789 /* simplistic model for one frame's bandwidth */
1790 /* FIXME: account for transaction and packet overhead */
1791 switch (dum->gadget.speed) {
1792 case USB_SPEED_LOW:
1793 total = 8/*bytes*/ * 12/*packets*/;
1794 break;
1795 case USB_SPEED_FULL:
1796 total = 64/*bytes*/ * 19/*packets*/;
1797 break;
1798 case USB_SPEED_HIGH:
1799 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1800 break;
1801 case USB_SPEED_SUPER:
1802 /* Bus speed is 500000 bytes/ms, so use a little less */
1803 total = 490000;
1804 break;
1805 default: /* Can't happen */
1806 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1807 total = 0;
1808 break;
1809 }
1810
1811 /* FIXME if HZ != 1000 this will probably misbehave ... */
1812
1813 /* look at each urb queued by the host side driver */
1814 spin_lock_irqsave(&dum->lock, flags);
1815
1816 if (!dum_hcd->udev) {
1817 dev_err(dummy_dev(dum_hcd),
1818 "timer fired with no URBs pending?\n");
1819 spin_unlock_irqrestore(&dum->lock, flags);
1820 return;
1821 }
1822 dum_hcd->next_frame_urbp = NULL;
1823
1824 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1825 if (!ep_info[i].name)
1826 break;
1827 dum->ep[i].already_seen = 0;
1828 }
1829
1830 restart:
1831 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1832 struct urb *urb;
1833 struct dummy_request *req;
1834 u8 address;
1835 struct dummy_ep *ep = NULL;
1836 int status = -EINPROGRESS;
1837
1838 /* stop when we reach URBs queued after the timer interrupt */
1839 if (urbp == dum_hcd->next_frame_urbp)
1840 break;
1841
1842 urb = urbp->urb;
1843 if (urb->unlinked)
1844 goto return_urb;
1845 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1846 continue;
1847
1848 /* Used up this frame's bandwidth? */
1849 if (total <= 0)
1850 continue;
1851
1852 /* find the gadget's ep for this request (if configured) */
1853 address = usb_pipeendpoint (urb->pipe);
1854 if (usb_urb_dir_in(urb))
1855 address |= USB_DIR_IN;
1856 ep = find_endpoint(dum, address);
1857 if (!ep) {
1858 /* set_configuration() disagreement */
1859 dev_dbg(dummy_dev(dum_hcd),
1860 "no ep configured for urb %p\n",
1861 urb);
1862 status = -EPROTO;
1863 goto return_urb;
1864 }
1865
1866 if (ep->already_seen)
1867 continue;
1868 ep->already_seen = 1;
1869 if (ep == &dum->ep[0] && urb->error_count) {
1870 ep->setup_stage = 1; /* a new urb */
1871 urb->error_count = 0;
1872 }
1873 if (ep->halted && !ep->setup_stage) {
1874 /* NOTE: must not be iso! */
1875 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1876 ep->ep.name, urb);
1877 status = -EPIPE;
1878 goto return_urb;
1879 }
1880 /* FIXME make sure both ends agree on maxpacket */
1881
1882 /* handle control requests */
1883 if (ep == &dum->ep[0] && ep->setup_stage) {
1884 struct usb_ctrlrequest setup;
1885 int value;
1886
1887 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1888 /* paranoia, in case of stale queued data */
1889 list_for_each_entry(req, &ep->queue, queue) {
1890 list_del_init(&req->queue);
1891 req->req.status = -EOVERFLOW;
1892 dev_dbg(udc_dev(dum), "stale req = %p\n",
1893 req);
1894
1895 spin_unlock(&dum->lock);
1896 usb_gadget_giveback_request(&ep->ep, &req->req);
1897 spin_lock(&dum->lock);
1898 ep->already_seen = 0;
1899 goto restart;
1900 }
1901
1902 /* gadget driver never sees set_address or operations
1903 * on standard feature flags. some hardware doesn't
1904 * even expose them.
1905 */
1906 ep->last_io = jiffies;
1907 ep->setup_stage = 0;
1908 ep->halted = 0;
1909
1910 value = handle_control_request(dum_hcd, urb, &setup,
1911 &status);
1912
1913 /* gadget driver handles all other requests. block
1914 * until setup() returns; no reentrancy issues etc.
1915 */
1916 if (value > 0) {
1917 ++dum->callback_usage;
1918 spin_unlock(&dum->lock);
1919 value = dum->driver->setup(&dum->gadget,
1920 &setup);
1921 spin_lock(&dum->lock);
1922 --dum->callback_usage;
1923
1924 if (value >= 0) {
1925 /* no delays (max 64KB data stage) */
1926 limit = 64*1024;
1927 goto treat_control_like_bulk;
1928 }
1929 /* error, see below */
1930 }
1931
1932 if (value < 0) {
1933 if (value != -EOPNOTSUPP)
1934 dev_dbg(udc_dev(dum),
1935 "setup --> %d\n",
1936 value);
1937 status = -EPIPE;
1938 urb->actual_length = 0;
1939 }
1940
1941 goto return_urb;
1942 }
1943
1944 /* non-control requests */
1945 limit = total;
1946 switch (usb_pipetype(urb->pipe)) {
1947 case PIPE_ISOCHRONOUS:
1948 /*
1949 * We don't support isochronous. But if we did,
1950 * here are some of the issues we'd have to face:
1951 *
1952 * Is it urb->interval since the last xfer?
1953 * Use urb->iso_frame_desc[i].
1954 * Complete whether or not ep has requests queued.
1955 * Report random errors, to debug drivers.
1956 */
1957 limit = max(limit, periodic_bytes(dum, ep));
1958 status = -EINVAL; /* fail all xfers */
1959 break;
1960
1961 case PIPE_INTERRUPT:
1962 /* FIXME is it urb->interval since the last xfer?
1963 * this almost certainly polls too fast.
1964 */
1965 limit = max(limit, periodic_bytes(dum, ep));
1966 fallthrough;
1967
1968 default:
1969 treat_control_like_bulk:
1970 ep->last_io = jiffies;
1971 total -= transfer(dum_hcd, urb, ep, limit, &status);
1972 break;
1973 }
1974
1975 /* incomplete transfer? */
1976 if (status == -EINPROGRESS)
1977 continue;
1978
1979 return_urb:
1980 list_del(&urbp->urbp_list);
1981 kfree(urbp);
1982 if (ep)
1983 ep->already_seen = ep->setup_stage = 0;
1984
1985 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1986 spin_unlock(&dum->lock);
1987 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1988 spin_lock(&dum->lock);
1989
1990 goto restart;
1991 }
1992
1993 if (list_empty(&dum_hcd->urbp_list)) {
1994 usb_put_dev(dum_hcd->udev);
1995 dum_hcd->udev = NULL;
1996 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1997 /* want a 1 msec delay here */
1998 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1999 }
2000
2001 spin_unlock_irqrestore(&dum->lock, flags);
2002 }
2003
2004 /*-------------------------------------------------------------------------*/
2005
2006 #define PORT_C_MASK \
2007 ((USB_PORT_STAT_C_CONNECTION \
2008 | USB_PORT_STAT_C_ENABLE \
2009 | USB_PORT_STAT_C_SUSPEND \
2010 | USB_PORT_STAT_C_OVERCURRENT \
2011 | USB_PORT_STAT_C_RESET) << 16)
2012
dummy_hub_status(struct usb_hcd * hcd,char * buf)2013 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
2014 {
2015 struct dummy_hcd *dum_hcd;
2016 unsigned long flags;
2017 int retval = 0;
2018
2019 dum_hcd = hcd_to_dummy_hcd(hcd);
2020
2021 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2022 if (!HCD_HW_ACCESSIBLE(hcd))
2023 goto done;
2024
2025 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2026 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2027 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2028 set_link_state(dum_hcd);
2029 }
2030
2031 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2032 *buf = (1 << 1);
2033 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2034 dum_hcd->port_status);
2035 retval = 1;
2036 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2037 usb_hcd_resume_root_hub(hcd);
2038 }
2039 done:
2040 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2041 return retval;
2042 }
2043
2044 /* usb 3.0 root hub device descriptor */
2045 static struct {
2046 struct usb_bos_descriptor bos;
2047 struct usb_ss_cap_descriptor ss_cap;
2048 } __packed usb3_bos_desc = {
2049
2050 .bos = {
2051 .bLength = USB_DT_BOS_SIZE,
2052 .bDescriptorType = USB_DT_BOS,
2053 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
2054 .bNumDeviceCaps = 1,
2055 },
2056 .ss_cap = {
2057 .bLength = USB_DT_USB_SS_CAP_SIZE,
2058 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
2059 .bDevCapabilityType = USB_SS_CAP_TYPE,
2060 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
2061 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
2062 },
2063 };
2064
2065 static inline void
ss_hub_descriptor(struct usb_hub_descriptor * desc)2066 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2067 {
2068 memset(desc, 0, sizeof *desc);
2069 desc->bDescriptorType = USB_DT_SS_HUB;
2070 desc->bDescLength = 12;
2071 desc->wHubCharacteristics = cpu_to_le16(
2072 HUB_CHAR_INDV_PORT_LPSM |
2073 HUB_CHAR_COMMON_OCPM);
2074 desc->bNbrPorts = 1;
2075 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2076 desc->u.ss.DeviceRemovable = 0;
2077 }
2078
hub_descriptor(struct usb_hub_descriptor * desc)2079 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2080 {
2081 memset(desc, 0, sizeof *desc);
2082 desc->bDescriptorType = USB_DT_HUB;
2083 desc->bDescLength = 9;
2084 desc->wHubCharacteristics = cpu_to_le16(
2085 HUB_CHAR_INDV_PORT_LPSM |
2086 HUB_CHAR_COMMON_OCPM);
2087 desc->bNbrPorts = 1;
2088 desc->u.hs.DeviceRemovable[0] = 0;
2089 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */
2090 }
2091
dummy_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)2092 static int dummy_hub_control(
2093 struct usb_hcd *hcd,
2094 u16 typeReq,
2095 u16 wValue,
2096 u16 wIndex,
2097 char *buf,
2098 u16 wLength
2099 ) {
2100 struct dummy_hcd *dum_hcd;
2101 int retval = 0;
2102 unsigned long flags;
2103
2104 if (!HCD_HW_ACCESSIBLE(hcd))
2105 return -ETIMEDOUT;
2106
2107 dum_hcd = hcd_to_dummy_hcd(hcd);
2108
2109 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2110 switch (typeReq) {
2111 case ClearHubFeature:
2112 break;
2113 case ClearPortFeature:
2114 switch (wValue) {
2115 case USB_PORT_FEAT_SUSPEND:
2116 if (hcd->speed == HCD_USB3) {
2117 dev_dbg(dummy_dev(dum_hcd),
2118 "USB_PORT_FEAT_SUSPEND req not "
2119 "supported for USB 3.0 roothub\n");
2120 goto error;
2121 }
2122 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2123 /* 20msec resume signaling */
2124 dum_hcd->resuming = 1;
2125 dum_hcd->re_timeout = jiffies +
2126 msecs_to_jiffies(20);
2127 }
2128 break;
2129 case USB_PORT_FEAT_POWER:
2130 dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2131 if (hcd->speed == HCD_USB3)
2132 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2133 else
2134 dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2135 set_link_state(dum_hcd);
2136 break;
2137 case USB_PORT_FEAT_ENABLE:
2138 case USB_PORT_FEAT_C_ENABLE:
2139 case USB_PORT_FEAT_C_SUSPEND:
2140 /* Not allowed for USB-3 */
2141 if (hcd->speed == HCD_USB3)
2142 goto error;
2143 fallthrough;
2144 case USB_PORT_FEAT_C_CONNECTION:
2145 case USB_PORT_FEAT_C_RESET:
2146 dum_hcd->port_status &= ~(1 << wValue);
2147 set_link_state(dum_hcd);
2148 break;
2149 default:
2150 /* Disallow INDICATOR and C_OVER_CURRENT */
2151 goto error;
2152 }
2153 break;
2154 case GetHubDescriptor:
2155 if (hcd->speed == HCD_USB3 &&
2156 (wLength < USB_DT_SS_HUB_SIZE ||
2157 wValue != (USB_DT_SS_HUB << 8))) {
2158 dev_dbg(dummy_dev(dum_hcd),
2159 "Wrong hub descriptor type for "
2160 "USB 3.0 roothub.\n");
2161 goto error;
2162 }
2163 if (hcd->speed == HCD_USB3)
2164 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2165 else
2166 hub_descriptor((struct usb_hub_descriptor *) buf);
2167 break;
2168
2169 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2170 if (hcd->speed != HCD_USB3)
2171 goto error;
2172
2173 if ((wValue >> 8) != USB_DT_BOS)
2174 goto error;
2175
2176 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2177 retval = sizeof(usb3_bos_desc);
2178 break;
2179
2180 case GetHubStatus:
2181 *(__le32 *) buf = cpu_to_le32(0);
2182 break;
2183 case GetPortStatus:
2184 if (wIndex != 1)
2185 retval = -EPIPE;
2186
2187 /* whoever resets or resumes must GetPortStatus to
2188 * complete it!!
2189 */
2190 if (dum_hcd->resuming &&
2191 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2192 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2193 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2194 }
2195 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2196 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2197 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2198 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2199 if (dum_hcd->dum->pullup) {
2200 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2201
2202 if (hcd->speed < HCD_USB3) {
2203 switch (dum_hcd->dum->gadget.speed) {
2204 case USB_SPEED_HIGH:
2205 dum_hcd->port_status |=
2206 USB_PORT_STAT_HIGH_SPEED;
2207 break;
2208 case USB_SPEED_LOW:
2209 dum_hcd->dum->gadget.ep0->
2210 maxpacket = 8;
2211 dum_hcd->port_status |=
2212 USB_PORT_STAT_LOW_SPEED;
2213 break;
2214 default:
2215 break;
2216 }
2217 }
2218 }
2219 }
2220 set_link_state(dum_hcd);
2221 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2222 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2223 break;
2224 case SetHubFeature:
2225 retval = -EPIPE;
2226 break;
2227 case SetPortFeature:
2228 switch (wValue) {
2229 case USB_PORT_FEAT_LINK_STATE:
2230 if (hcd->speed != HCD_USB3) {
2231 dev_dbg(dummy_dev(dum_hcd),
2232 "USB_PORT_FEAT_LINK_STATE req not "
2233 "supported for USB 2.0 roothub\n");
2234 goto error;
2235 }
2236 /*
2237 * Since this is dummy we don't have an actual link so
2238 * there is nothing to do for the SET_LINK_STATE cmd
2239 */
2240 break;
2241 case USB_PORT_FEAT_U1_TIMEOUT:
2242 case USB_PORT_FEAT_U2_TIMEOUT:
2243 /* TODO: add suspend/resume support! */
2244 if (hcd->speed != HCD_USB3) {
2245 dev_dbg(dummy_dev(dum_hcd),
2246 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2247 "supported for USB 2.0 roothub\n");
2248 goto error;
2249 }
2250 break;
2251 case USB_PORT_FEAT_SUSPEND:
2252 /* Applicable only for USB2.0 hub */
2253 if (hcd->speed == HCD_USB3) {
2254 dev_dbg(dummy_dev(dum_hcd),
2255 "USB_PORT_FEAT_SUSPEND req not "
2256 "supported for USB 3.0 roothub\n");
2257 goto error;
2258 }
2259 if (dum_hcd->active) {
2260 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2261
2262 /* HNP would happen here; for now we
2263 * assume b_bus_req is always true.
2264 */
2265 set_link_state(dum_hcd);
2266 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2267 & dum_hcd->dum->devstatus) != 0)
2268 dev_dbg(dummy_dev(dum_hcd),
2269 "no HNP yet!\n");
2270 }
2271 break;
2272 case USB_PORT_FEAT_POWER:
2273 if (hcd->speed == HCD_USB3)
2274 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2275 else
2276 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2277 set_link_state(dum_hcd);
2278 break;
2279 case USB_PORT_FEAT_BH_PORT_RESET:
2280 /* Applicable only for USB3.0 hub */
2281 if (hcd->speed != HCD_USB3) {
2282 dev_dbg(dummy_dev(dum_hcd),
2283 "USB_PORT_FEAT_BH_PORT_RESET req not "
2284 "supported for USB 2.0 roothub\n");
2285 goto error;
2286 }
2287 fallthrough;
2288 case USB_PORT_FEAT_RESET:
2289 if (!(dum_hcd->port_status & USB_PORT_STAT_CONNECTION))
2290 break;
2291 /* if it's already enabled, disable */
2292 if (hcd->speed == HCD_USB3) {
2293 dum_hcd->port_status =
2294 (USB_SS_PORT_STAT_POWER |
2295 USB_PORT_STAT_CONNECTION |
2296 USB_PORT_STAT_RESET);
2297 } else {
2298 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2299 | USB_PORT_STAT_LOW_SPEED
2300 | USB_PORT_STAT_HIGH_SPEED);
2301 dum_hcd->port_status |= USB_PORT_STAT_RESET;
2302 }
2303 /*
2304 * We want to reset device status. All but the
2305 * Self powered feature
2306 */
2307 dum_hcd->dum->devstatus &=
2308 (1 << USB_DEVICE_SELF_POWERED);
2309 /*
2310 * FIXME USB3.0: what is the correct reset signaling
2311 * interval? Is it still 50msec as for HS?
2312 */
2313 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2314 set_link_state(dum_hcd);
2315 break;
2316 case USB_PORT_FEAT_C_CONNECTION:
2317 case USB_PORT_FEAT_C_RESET:
2318 case USB_PORT_FEAT_C_ENABLE:
2319 case USB_PORT_FEAT_C_SUSPEND:
2320 /* Not allowed for USB-3, and ignored for USB-2 */
2321 if (hcd->speed == HCD_USB3)
2322 goto error;
2323 break;
2324 default:
2325 /* Disallow TEST, INDICATOR, and C_OVER_CURRENT */
2326 goto error;
2327 }
2328 break;
2329 case GetPortErrorCount:
2330 if (hcd->speed != HCD_USB3) {
2331 dev_dbg(dummy_dev(dum_hcd),
2332 "GetPortErrorCount req not "
2333 "supported for USB 2.0 roothub\n");
2334 goto error;
2335 }
2336 /* We'll always return 0 since this is a dummy hub */
2337 *(__le32 *) buf = cpu_to_le32(0);
2338 break;
2339 case SetHubDepth:
2340 if (hcd->speed != HCD_USB3) {
2341 dev_dbg(dummy_dev(dum_hcd),
2342 "SetHubDepth req not supported for "
2343 "USB 2.0 roothub\n");
2344 goto error;
2345 }
2346 break;
2347 default:
2348 dev_dbg(dummy_dev(dum_hcd),
2349 "hub control req%04x v%04x i%04x l%d\n",
2350 typeReq, wValue, wIndex, wLength);
2351 error:
2352 /* "protocol stall" on error */
2353 retval = -EPIPE;
2354 }
2355 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2356
2357 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2358 usb_hcd_poll_rh_status(hcd);
2359 return retval;
2360 }
2361
dummy_bus_suspend(struct usb_hcd * hcd)2362 static int dummy_bus_suspend(struct usb_hcd *hcd)
2363 {
2364 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2365
2366 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2367
2368 spin_lock_irq(&dum_hcd->dum->lock);
2369 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2370 set_link_state(dum_hcd);
2371 hcd->state = HC_STATE_SUSPENDED;
2372 spin_unlock_irq(&dum_hcd->dum->lock);
2373 return 0;
2374 }
2375
dummy_bus_resume(struct usb_hcd * hcd)2376 static int dummy_bus_resume(struct usb_hcd *hcd)
2377 {
2378 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2379 int rc = 0;
2380
2381 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2382
2383 spin_lock_irq(&dum_hcd->dum->lock);
2384 if (!HCD_HW_ACCESSIBLE(hcd)) {
2385 rc = -ESHUTDOWN;
2386 } else {
2387 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2388 set_link_state(dum_hcd);
2389 if (!list_empty(&dum_hcd->urbp_list))
2390 mod_timer(&dum_hcd->timer, jiffies);
2391 hcd->state = HC_STATE_RUNNING;
2392 }
2393 spin_unlock_irq(&dum_hcd->dum->lock);
2394 return rc;
2395 }
2396
2397 /*-------------------------------------------------------------------------*/
2398
show_urb(char * buf,size_t size,struct urb * urb)2399 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2400 {
2401 int ep = usb_pipeendpoint(urb->pipe);
2402
2403 return scnprintf(buf, size,
2404 "urb/%p %s ep%d%s%s len %d/%d\n",
2405 urb,
2406 ({ char *s;
2407 switch (urb->dev->speed) {
2408 case USB_SPEED_LOW:
2409 s = "ls";
2410 break;
2411 case USB_SPEED_FULL:
2412 s = "fs";
2413 break;
2414 case USB_SPEED_HIGH:
2415 s = "hs";
2416 break;
2417 case USB_SPEED_SUPER:
2418 s = "ss";
2419 break;
2420 default:
2421 s = "?";
2422 break;
2423 } s; }),
2424 ep, ep ? (usb_urb_dir_in(urb) ? "in" : "out") : "",
2425 ({ char *s; \
2426 switch (usb_pipetype(urb->pipe)) { \
2427 case PIPE_CONTROL: \
2428 s = ""; \
2429 break; \
2430 case PIPE_BULK: \
2431 s = "-bulk"; \
2432 break; \
2433 case PIPE_INTERRUPT: \
2434 s = "-int"; \
2435 break; \
2436 default: \
2437 s = "-iso"; \
2438 break; \
2439 } s; }),
2440 urb->actual_length, urb->transfer_buffer_length);
2441 }
2442
urbs_show(struct device * dev,struct device_attribute * attr,char * buf)2443 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2444 char *buf)
2445 {
2446 struct usb_hcd *hcd = dev_get_drvdata(dev);
2447 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2448 struct urbp *urbp;
2449 size_t size = 0;
2450 unsigned long flags;
2451
2452 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2453 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2454 size_t temp;
2455
2456 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2457 buf += temp;
2458 size += temp;
2459 }
2460 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2461
2462 return size;
2463 }
2464 static DEVICE_ATTR_RO(urbs);
2465
dummy_start_ss(struct dummy_hcd * dum_hcd)2466 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2467 {
2468 timer_setup(&dum_hcd->timer, dummy_timer, 0);
2469 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2470 dum_hcd->stream_en_ep = 0;
2471 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2472 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3;
2473 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2474 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2475 #ifdef CONFIG_USB_OTG
2476 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2477 #endif
2478 return 0;
2479
2480 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2481 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2482 }
2483
dummy_start(struct usb_hcd * hcd)2484 static int dummy_start(struct usb_hcd *hcd)
2485 {
2486 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2487
2488 /*
2489 * HOST side init ... we emulate a root hub that'll only ever
2490 * talk to one device (the gadget side). Also appears in sysfs,
2491 * just like more familiar pci-based HCDs.
2492 */
2493 if (!usb_hcd_is_primary_hcd(hcd))
2494 return dummy_start_ss(dum_hcd);
2495
2496 spin_lock_init(&dum_hcd->dum->lock);
2497 timer_setup(&dum_hcd->timer, dummy_timer, 0);
2498 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2499
2500 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2501
2502 hcd->power_budget = POWER_BUDGET;
2503 hcd->state = HC_STATE_RUNNING;
2504 hcd->uses_new_polling = 1;
2505
2506 #ifdef CONFIG_USB_OTG
2507 hcd->self.otg_port = 1;
2508 #endif
2509
2510 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2511 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2512 }
2513
dummy_stop(struct usb_hcd * hcd)2514 static void dummy_stop(struct usb_hcd *hcd)
2515 {
2516 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2517 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2518 }
2519
2520 /*-------------------------------------------------------------------------*/
2521
dummy_h_get_frame(struct usb_hcd * hcd)2522 static int dummy_h_get_frame(struct usb_hcd *hcd)
2523 {
2524 return dummy_g_get_frame(NULL);
2525 }
2526
dummy_setup(struct usb_hcd * hcd)2527 static int dummy_setup(struct usb_hcd *hcd)
2528 {
2529 struct dummy *dum;
2530
2531 dum = *((void **)dev_get_platdata(hcd->self.controller));
2532 hcd->self.sg_tablesize = ~0;
2533 if (usb_hcd_is_primary_hcd(hcd)) {
2534 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2535 dum->hs_hcd->dum = dum;
2536 /*
2537 * Mark the first roothub as being USB 2.0.
2538 * The USB 3.0 roothub will be registered later by
2539 * dummy_hcd_probe()
2540 */
2541 hcd->speed = HCD_USB2;
2542 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2543 } else {
2544 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2545 dum->ss_hcd->dum = dum;
2546 hcd->speed = HCD_USB3;
2547 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2548 }
2549 return 0;
2550 }
2551
2552 /* Change a group of bulk endpoints to support multiple stream IDs */
dummy_alloc_streams(struct usb_hcd * hcd,struct usb_device * udev,struct usb_host_endpoint ** eps,unsigned int num_eps,unsigned int num_streams,gfp_t mem_flags)2553 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2554 struct usb_host_endpoint **eps, unsigned int num_eps,
2555 unsigned int num_streams, gfp_t mem_flags)
2556 {
2557 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2558 unsigned long flags;
2559 int max_stream;
2560 int ret_streams = num_streams;
2561 unsigned int index;
2562 unsigned int i;
2563
2564 if (!num_eps)
2565 return -EINVAL;
2566
2567 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2568 for (i = 0; i < num_eps; i++) {
2569 index = dummy_get_ep_idx(&eps[i]->desc);
2570 if ((1 << index) & dum_hcd->stream_en_ep) {
2571 ret_streams = -EINVAL;
2572 goto out;
2573 }
2574 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2575 if (!max_stream) {
2576 ret_streams = -EINVAL;
2577 goto out;
2578 }
2579 if (max_stream < ret_streams) {
2580 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2581 "stream IDs.\n",
2582 eps[i]->desc.bEndpointAddress,
2583 max_stream);
2584 ret_streams = max_stream;
2585 }
2586 }
2587
2588 for (i = 0; i < num_eps; i++) {
2589 index = dummy_get_ep_idx(&eps[i]->desc);
2590 dum_hcd->stream_en_ep |= 1 << index;
2591 set_max_streams_for_pipe(dum_hcd,
2592 usb_endpoint_num(&eps[i]->desc), ret_streams);
2593 }
2594 out:
2595 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2596 return ret_streams;
2597 }
2598
2599 /* Reverts a group of bulk endpoints back to not using stream IDs. */
dummy_free_streams(struct usb_hcd * hcd,struct usb_device * udev,struct usb_host_endpoint ** eps,unsigned int num_eps,gfp_t mem_flags)2600 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2601 struct usb_host_endpoint **eps, unsigned int num_eps,
2602 gfp_t mem_flags)
2603 {
2604 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2605 unsigned long flags;
2606 int ret;
2607 unsigned int index;
2608 unsigned int i;
2609
2610 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2611 for (i = 0; i < num_eps; i++) {
2612 index = dummy_get_ep_idx(&eps[i]->desc);
2613 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2614 ret = -EINVAL;
2615 goto out;
2616 }
2617 }
2618
2619 for (i = 0; i < num_eps; i++) {
2620 index = dummy_get_ep_idx(&eps[i]->desc);
2621 dum_hcd->stream_en_ep &= ~(1 << index);
2622 set_max_streams_for_pipe(dum_hcd,
2623 usb_endpoint_num(&eps[i]->desc), 0);
2624 }
2625 ret = 0;
2626 out:
2627 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2628 return ret;
2629 }
2630
2631 static struct hc_driver dummy_hcd = {
2632 .description = (char *) driver_name,
2633 .product_desc = "Dummy host controller",
2634 .hcd_priv_size = sizeof(struct dummy_hcd),
2635
2636 .reset = dummy_setup,
2637 .start = dummy_start,
2638 .stop = dummy_stop,
2639
2640 .urb_enqueue = dummy_urb_enqueue,
2641 .urb_dequeue = dummy_urb_dequeue,
2642
2643 .get_frame_number = dummy_h_get_frame,
2644
2645 .hub_status_data = dummy_hub_status,
2646 .hub_control = dummy_hub_control,
2647 .bus_suspend = dummy_bus_suspend,
2648 .bus_resume = dummy_bus_resume,
2649
2650 .alloc_streams = dummy_alloc_streams,
2651 .free_streams = dummy_free_streams,
2652 };
2653
dummy_hcd_probe(struct platform_device * pdev)2654 static int dummy_hcd_probe(struct platform_device *pdev)
2655 {
2656 struct dummy *dum;
2657 struct usb_hcd *hs_hcd;
2658 struct usb_hcd *ss_hcd;
2659 int retval;
2660
2661 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2662 dum = *((void **)dev_get_platdata(&pdev->dev));
2663
2664 if (mod_data.is_super_speed)
2665 dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2666 else if (mod_data.is_high_speed)
2667 dummy_hcd.flags = HCD_USB2;
2668 else
2669 dummy_hcd.flags = HCD_USB11;
2670 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2671 if (!hs_hcd)
2672 return -ENOMEM;
2673 hs_hcd->has_tt = 1;
2674
2675 retval = usb_add_hcd(hs_hcd, 0, 0);
2676 if (retval)
2677 goto put_usb2_hcd;
2678
2679 if (mod_data.is_super_speed) {
2680 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2681 dev_name(&pdev->dev), hs_hcd);
2682 if (!ss_hcd) {
2683 retval = -ENOMEM;
2684 goto dealloc_usb2_hcd;
2685 }
2686
2687 retval = usb_add_hcd(ss_hcd, 0, 0);
2688 if (retval)
2689 goto put_usb3_hcd;
2690 }
2691 return 0;
2692
2693 put_usb3_hcd:
2694 usb_put_hcd(ss_hcd);
2695 dealloc_usb2_hcd:
2696 usb_remove_hcd(hs_hcd);
2697 put_usb2_hcd:
2698 usb_put_hcd(hs_hcd);
2699 dum->hs_hcd = dum->ss_hcd = NULL;
2700 return retval;
2701 }
2702
dummy_hcd_remove(struct platform_device * pdev)2703 static void dummy_hcd_remove(struct platform_device *pdev)
2704 {
2705 struct dummy *dum;
2706
2707 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2708
2709 if (dum->ss_hcd) {
2710 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2711 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2712 }
2713
2714 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2715 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2716
2717 dum->hs_hcd = NULL;
2718 dum->ss_hcd = NULL;
2719 }
2720
dummy_hcd_suspend(struct platform_device * pdev,pm_message_t state)2721 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2722 {
2723 struct usb_hcd *hcd;
2724 struct dummy_hcd *dum_hcd;
2725 int rc = 0;
2726
2727 dev_dbg(&pdev->dev, "%s\n", __func__);
2728
2729 hcd = platform_get_drvdata(pdev);
2730 dum_hcd = hcd_to_dummy_hcd(hcd);
2731 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2732 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2733 rc = -EBUSY;
2734 } else
2735 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2736 return rc;
2737 }
2738
dummy_hcd_resume(struct platform_device * pdev)2739 static int dummy_hcd_resume(struct platform_device *pdev)
2740 {
2741 struct usb_hcd *hcd;
2742
2743 dev_dbg(&pdev->dev, "%s\n", __func__);
2744
2745 hcd = platform_get_drvdata(pdev);
2746 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2747 usb_hcd_poll_rh_status(hcd);
2748 return 0;
2749 }
2750
2751 static struct platform_driver dummy_hcd_driver = {
2752 .probe = dummy_hcd_probe,
2753 .remove_new = dummy_hcd_remove,
2754 .suspend = dummy_hcd_suspend,
2755 .resume = dummy_hcd_resume,
2756 .driver = {
2757 .name = driver_name,
2758 },
2759 };
2760
2761 /*-------------------------------------------------------------------------*/
2762 #define MAX_NUM_UDC 32
2763 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2764 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2765
dummy_hcd_init(void)2766 static int __init dummy_hcd_init(void)
2767 {
2768 int retval = -ENOMEM;
2769 int i;
2770 struct dummy *dum[MAX_NUM_UDC] = {};
2771
2772 if (usb_disabled())
2773 return -ENODEV;
2774
2775 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2776 return -EINVAL;
2777
2778 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2779 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2780 MAX_NUM_UDC);
2781 return -EINVAL;
2782 }
2783
2784 for (i = 0; i < mod_data.num; i++) {
2785 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2786 if (!the_hcd_pdev[i]) {
2787 i--;
2788 while (i >= 0)
2789 platform_device_put(the_hcd_pdev[i--]);
2790 return retval;
2791 }
2792 }
2793 for (i = 0; i < mod_data.num; i++) {
2794 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2795 if (!the_udc_pdev[i]) {
2796 i--;
2797 while (i >= 0)
2798 platform_device_put(the_udc_pdev[i--]);
2799 goto err_alloc_udc;
2800 }
2801 }
2802 for (i = 0; i < mod_data.num; i++) {
2803 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2804 if (!dum[i]) {
2805 retval = -ENOMEM;
2806 goto err_add_pdata;
2807 }
2808 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2809 sizeof(void *));
2810 if (retval)
2811 goto err_add_pdata;
2812 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2813 sizeof(void *));
2814 if (retval)
2815 goto err_add_pdata;
2816 }
2817
2818 retval = platform_driver_register(&dummy_hcd_driver);
2819 if (retval < 0)
2820 goto err_add_pdata;
2821 retval = platform_driver_register(&dummy_udc_driver);
2822 if (retval < 0)
2823 goto err_register_udc_driver;
2824
2825 for (i = 0; i < mod_data.num; i++) {
2826 retval = platform_device_add(the_hcd_pdev[i]);
2827 if (retval < 0) {
2828 i--;
2829 while (i >= 0)
2830 platform_device_del(the_hcd_pdev[i--]);
2831 goto err_add_hcd;
2832 }
2833 }
2834 for (i = 0; i < mod_data.num; i++) {
2835 if (!dum[i]->hs_hcd ||
2836 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2837 /*
2838 * The hcd was added successfully but its probe
2839 * function failed for some reason.
2840 */
2841 retval = -EINVAL;
2842 goto err_add_udc;
2843 }
2844 }
2845
2846 for (i = 0; i < mod_data.num; i++) {
2847 retval = platform_device_add(the_udc_pdev[i]);
2848 if (retval < 0) {
2849 i--;
2850 while (i >= 0)
2851 platform_device_del(the_udc_pdev[i--]);
2852 goto err_add_udc;
2853 }
2854 }
2855
2856 for (i = 0; i < mod_data.num; i++) {
2857 if (!platform_get_drvdata(the_udc_pdev[i])) {
2858 /*
2859 * The udc was added successfully but its probe
2860 * function failed for some reason.
2861 */
2862 retval = -EINVAL;
2863 goto err_probe_udc;
2864 }
2865 }
2866 return retval;
2867
2868 err_probe_udc:
2869 for (i = 0; i < mod_data.num; i++)
2870 platform_device_del(the_udc_pdev[i]);
2871 err_add_udc:
2872 for (i = 0; i < mod_data.num; i++)
2873 platform_device_del(the_hcd_pdev[i]);
2874 err_add_hcd:
2875 platform_driver_unregister(&dummy_udc_driver);
2876 err_register_udc_driver:
2877 platform_driver_unregister(&dummy_hcd_driver);
2878 err_add_pdata:
2879 for (i = 0; i < mod_data.num; i++)
2880 kfree(dum[i]);
2881 for (i = 0; i < mod_data.num; i++)
2882 platform_device_put(the_udc_pdev[i]);
2883 err_alloc_udc:
2884 for (i = 0; i < mod_data.num; i++)
2885 platform_device_put(the_hcd_pdev[i]);
2886 return retval;
2887 }
2888 module_init(dummy_hcd_init);
2889
dummy_hcd_cleanup(void)2890 static void __exit dummy_hcd_cleanup(void)
2891 {
2892 int i;
2893
2894 for (i = 0; i < mod_data.num; i++) {
2895 struct dummy *dum;
2896
2897 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2898
2899 platform_device_unregister(the_udc_pdev[i]);
2900 platform_device_unregister(the_hcd_pdev[i]);
2901 kfree(dum);
2902 }
2903 platform_driver_unregister(&dummy_udc_driver);
2904 platform_driver_unregister(&dummy_hcd_driver);
2905 }
2906 module_exit(dummy_hcd_cleanup);
2907
