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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / usb / gadget / udc / dummy_hcd.c
blobeb876ed96861d684cc13ab167fa0f322707f4a69
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_ep *ep;
660 struct dummy_request *req;
661
662 if (!_ep)
663 return NULL;
664 ep = usb_ep_to_dummy_ep(_ep);
665
666 req = kzalloc(sizeof(*req), mem_flags);
667 if (!req)
668 return NULL;
669 INIT_LIST_HEAD(&req->queue);
670 return &req->req;
671 }
672
673 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
674 {
675 struct dummy_request *req;
676
677 if (!_ep || !_req) {
678 WARN_ON(1);
679 return;
680 }
681
682 req = usb_request_to_dummy_request(_req);
683 WARN_ON(!list_empty(&req->queue));
684 kfree(req);
685 }
686
687 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
688 {
689 }
690
691 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
692 gfp_t mem_flags)
693 {
694 struct dummy_ep *ep;
695 struct dummy_request *req;
696 struct dummy *dum;
697 struct dummy_hcd *dum_hcd;
698 unsigned long flags;
699
700 req = usb_request_to_dummy_request(_req);
701 if (!_req || !list_empty(&req->queue) || !_req->complete)
702 return -EINVAL;
703
704 ep = usb_ep_to_dummy_ep(_ep);
705 if (!_ep || (!ep->desc && _ep->name != ep0name))
706 return -EINVAL;
707
708 dum = ep_to_dummy(ep);
709 dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
710 if (!dum->driver || !is_enabled(dum_hcd))
711 return -ESHUTDOWN;
712
713 #if 0
714 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
715 ep, _req, _ep->name, _req->length, _req->buf);
716 #endif
717 _req->status = -EINPROGRESS;
718 _req->actual = 0;
719 spin_lock_irqsave(&dum->lock, flags);
720
721 /* implement an emulated single-request FIFO */
722 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
723 list_empty(&dum->fifo_req.queue) &&
724 list_empty(&ep->queue) &&
725 _req->length <= FIFO_SIZE) {
726 req = &dum->fifo_req;
727 req->req = *_req;
728 req->req.buf = dum->fifo_buf;
729 memcpy(dum->fifo_buf, _req->buf, _req->length);
730 req->req.context = dum;
731 req->req.complete = fifo_complete;
732
733 list_add_tail(&req->queue, &ep->queue);
734 spin_unlock(&dum->lock);
735 _req->actual = _req->length;
736 _req->status = 0;
737 usb_gadget_giveback_request(_ep, _req);
738 spin_lock(&dum->lock);
739 } else
740 list_add_tail(&req->queue, &ep->queue);
741 spin_unlock_irqrestore(&dum->lock, flags);
742
743 /* real hardware would likely enable transfers here, in case
744 * it'd been left NAKing.
745 */
746 return 0;
747 }
748
749 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
750 {
751 struct dummy_ep *ep;
752 struct dummy *dum;
753 int retval = -EINVAL;
754 unsigned long flags;
755 struct dummy_request *req = NULL;
756
757 if (!_ep || !_req)
758 return retval;
759 ep = usb_ep_to_dummy_ep(_ep);
760 dum = ep_to_dummy(ep);
761
762 if (!dum->driver)
763 return -ESHUTDOWN;
764
765 local_irq_save(flags);
766 spin_lock(&dum->lock);
767 list_for_each_entry(req, &ep->queue, queue) {
768 if (&req->req == _req) {
769 list_del_init(&req->queue);
770 _req->status = -ECONNRESET;
771 retval = 0;
772 break;
773 }
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
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
814 dummy_set_halt(struct usb_ep *_ep, int value)
815 {
816 return dummy_set_halt_and_wedge(_ep, value, 0);
817 }
818
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 ... */
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
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
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
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
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
903 if (value && dum->driver) {
904 if (mod_data.is_super_speed)
905 dum->gadget.speed = dum->driver->max_speed;
906 else if (mod_data.is_high_speed)
907 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
908 dum->driver->max_speed);
909 else
910 dum->gadget.speed = USB_SPEED_FULL;
911 dummy_udc_update_ep0(dum);
912
913 if (dum->gadget.speed < dum->driver->max_speed)
914 dev_dbg(udc_dev(dum), "This device can perform faster"
915 " if you connect it to a %s port...\n",
916 usb_speed_string(dum->driver->max_speed));
917 }
918 dum_hcd = gadget_to_dummy_hcd(_gadget);
919
920 spin_lock_irqsave(&dum->lock, flags);
921 dum->pullup = (value != 0);
922 set_link_state(dum_hcd);
923 spin_unlock_irqrestore(&dum->lock, flags);
924
925 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
926 return 0;
927 }
928
929 static int dummy_udc_start(struct usb_gadget *g,
930 struct usb_gadget_driver *driver);
931 static int dummy_udc_stop(struct usb_gadget *g);
932
933 static const struct usb_gadget_ops dummy_ops = {
934 .get_frame = dummy_g_get_frame,
935 .wakeup = dummy_wakeup,
936 .set_selfpowered = dummy_set_selfpowered,
937 .pullup = dummy_pullup,
938 .udc_start = dummy_udc_start,
939 .udc_stop = dummy_udc_stop,
940 };
941
942 /*-------------------------------------------------------------------------*/
943
944 /* "function" sysfs attribute */
945 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
946 char *buf)
947 {
948 struct dummy *dum = gadget_dev_to_dummy(dev);
949
950 if (!dum->driver || !dum->driver->function)
951 return 0;
952 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
953 }
954 static DEVICE_ATTR_RO(function);
955
956 /*-------------------------------------------------------------------------*/
957
958 /*
959 * Driver registration/unregistration.
960 *
961 * This is basically hardware-specific; there's usually only one real USB
962 * device (not host) controller since that's how USB devices are intended
963 * to work. So most implementations of these api calls will rely on the
964 * fact that only one driver will ever bind to the hardware. But curious
965 * hardware can be built with discrete components, so the gadget API doesn't
966 * require that assumption.
967 *
968 * For this emulator, it might be convenient to create a usb slave device
969 * for each driver that registers: just add to a big root hub.
970 */
971
972 static int dummy_udc_start(struct usb_gadget *g,
973 struct usb_gadget_driver *driver)
974 {
975 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
976 struct dummy *dum = dum_hcd->dum;
977
978 if (driver->max_speed == USB_SPEED_UNKNOWN)
979 return -EINVAL;
980
981 /*
982 * SLAVE side init ... the layer above hardware, which
983 * can't enumerate without help from the driver we're binding.
984 */
985
986 spin_lock_irq(&dum->lock);
987 dum->devstatus = 0;
988 dum->driver = driver;
989 dum->ints_enabled = 1;
990 spin_unlock_irq(&dum->lock);
991
992 return 0;
993 }
994
995 static int dummy_udc_stop(struct usb_gadget *g)
996 {
997 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
998 struct dummy *dum = dum_hcd->dum;
999
1000 spin_lock_irq(&dum->lock);
1001 dum->ints_enabled = 0;
1002 stop_activity(dum);
1003
1004 /* emulate synchronize_irq(): wait for callbacks to finish */
1005 while (dum->callback_usage > 0) {
1006 spin_unlock_irq(&dum->lock);
1007 usleep_range(1000, 2000);
1008 spin_lock_irq(&dum->lock);
1009 }
1010
1011 dum->driver = NULL;
1012 spin_unlock_irq(&dum->lock);
1013
1014 return 0;
1015 }
1016
1017 #undef is_enabled
1018
1019 /* The gadget structure is stored inside the hcd structure and will be
1020 * released along with it. */
1021 static void init_dummy_udc_hw(struct dummy *dum)
1022 {
1023 int i;
1024
1025 INIT_LIST_HEAD(&dum->gadget.ep_list);
1026 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1027 struct dummy_ep *ep = &dum->ep[i];
1028
1029 if (!ep_info[i].name)
1030 break;
1031 ep->ep.name = ep_info[i].name;
1032 ep->ep.caps = ep_info[i].caps;
1033 ep->ep.ops = &dummy_ep_ops;
1034 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1035 ep->halted = ep->wedged = ep->already_seen =
1036 ep->setup_stage = 0;
1037 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1038 ep->ep.max_streams = 16;
1039 ep->last_io = jiffies;
1040 ep->gadget = &dum->gadget;
1041 ep->desc = NULL;
1042 INIT_LIST_HEAD(&ep->queue);
1043 }
1044
1045 dum->gadget.ep0 = &dum->ep[0].ep;
1046 list_del_init(&dum->ep[0].ep.ep_list);
1047 INIT_LIST_HEAD(&dum->fifo_req.queue);
1048
1049 #ifdef CONFIG_USB_OTG
1050 dum->gadget.is_otg = 1;
1051 #endif
1052 }
1053
1054 static int dummy_udc_probe(struct platform_device *pdev)
1055 {
1056 struct dummy *dum;
1057 int rc;
1058
1059 dum = *((void **)dev_get_platdata(&pdev->dev));
1060 /* Clear usb_gadget region for new registration to udc-core */
1061 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1062 dum->gadget.name = gadget_name;
1063 dum->gadget.ops = &dummy_ops;
1064 if (mod_data.is_super_speed)
1065 dum->gadget.max_speed = USB_SPEED_SUPER;
1066 else if (mod_data.is_high_speed)
1067 dum->gadget.max_speed = USB_SPEED_HIGH;
1068 else
1069 dum->gadget.max_speed = USB_SPEED_FULL;
1070
1071 dum->gadget.dev.parent = &pdev->dev;
1072 init_dummy_udc_hw(dum);
1073
1074 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1075 if (rc < 0)
1076 goto err_udc;
1077
1078 rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1079 if (rc < 0)
1080 goto err_dev;
1081 platform_set_drvdata(pdev, dum);
1082 return rc;
1083
1084 err_dev:
1085 usb_del_gadget_udc(&dum->gadget);
1086 err_udc:
1087 return rc;
1088 }
1089
1090 static int dummy_udc_remove(struct platform_device *pdev)
1091 {
1092 struct dummy *dum = platform_get_drvdata(pdev);
1093
1094 device_remove_file(&dum->gadget.dev, &dev_attr_function);
1095 usb_del_gadget_udc(&dum->gadget);
1096 return 0;
1097 }
1098
1099 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1100 int suspend)
1101 {
1102 spin_lock_irq(&dum->lock);
1103 dum->udc_suspended = suspend;
1104 set_link_state(dum_hcd);
1105 spin_unlock_irq(&dum->lock);
1106 }
1107
1108 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1109 {
1110 struct dummy *dum = platform_get_drvdata(pdev);
1111 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1112
1113 dev_dbg(&pdev->dev, "%s\n", __func__);
1114 dummy_udc_pm(dum, dum_hcd, 1);
1115 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1116 return 0;
1117 }
1118
1119 static int dummy_udc_resume(struct platform_device *pdev)
1120 {
1121 struct dummy *dum = platform_get_drvdata(pdev);
1122 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1123
1124 dev_dbg(&pdev->dev, "%s\n", __func__);
1125 dummy_udc_pm(dum, dum_hcd, 0);
1126 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1127 return 0;
1128 }
1129
1130 static struct platform_driver dummy_udc_driver = {
1131 .probe = dummy_udc_probe,
1132 .remove = dummy_udc_remove,
1133 .suspend = dummy_udc_suspend,
1134 .resume = dummy_udc_resume,
1135 .driver = {
1136 .name = (char *) gadget_name,
1137 },
1138 };
1139
1140 /*-------------------------------------------------------------------------*/
1141
1142 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1143 {
1144 unsigned int index;
1145
1146 index = usb_endpoint_num(desc) << 1;
1147 if (usb_endpoint_dir_in(desc))
1148 index |= 1;
1149 return index;
1150 }
1151
1152 /* MASTER/HOST SIDE DRIVER
1153 *
1154 * this uses the hcd framework to hook up to host side drivers.
1155 * its root hub will only have one device, otherwise it acts like
1156 * a normal host controller.
1157 *
1158 * when urbs are queued, they're just stuck on a list that we
1159 * scan in a timer callback. that callback connects writes from
1160 * the host with reads from the device, and so on, based on the
1161 * usb 2.0 rules.
1162 */
1163
1164 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1165 {
1166 const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1167 u32 index;
1168
1169 if (!usb_endpoint_xfer_bulk(desc))
1170 return 0;
1171
1172 index = dummy_get_ep_idx(desc);
1173 return (1 << index) & dum_hcd->stream_en_ep;
1174 }
1175
1176 /*
1177 * The max stream number is saved as a nibble so for the 30 possible endpoints
1178 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1179 * means we use only 1 stream). The maximum according to the spec is 16bit so
1180 * if the 16 stream limit is about to go, the array size should be incremented
1181 * to 30 elements of type u16.
1182 */
1183 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1184 unsigned int pipe)
1185 {
1186 int max_streams;
1187
1188 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1189 if (usb_pipeout(pipe))
1190 max_streams >>= 4;
1191 else
1192 max_streams &= 0xf;
1193 max_streams++;
1194 return max_streams;
1195 }
1196
1197 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1198 unsigned int pipe, unsigned int streams)
1199 {
1200 int max_streams;
1201
1202 streams--;
1203 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1204 if (usb_pipeout(pipe)) {
1205 streams <<= 4;
1206 max_streams &= 0xf;
1207 } else {
1208 max_streams &= 0xf0;
1209 }
1210 max_streams |= streams;
1211 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1212 }
1213
1214 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1215 {
1216 unsigned int max_streams;
1217 int enabled;
1218
1219 enabled = dummy_ep_stream_en(dum_hcd, urb);
1220 if (!urb->stream_id) {
1221 if (enabled)
1222 return -EINVAL;
1223 return 0;
1224 }
1225 if (!enabled)
1226 return -EINVAL;
1227
1228 max_streams = get_max_streams_for_pipe(dum_hcd,
1229 usb_pipeendpoint(urb->pipe));
1230 if (urb->stream_id > max_streams) {
1231 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1232 urb->stream_id);
1233 BUG();
1234 return -EINVAL;
1235 }
1236 return 0;
1237 }
1238
1239 static int dummy_urb_enqueue(
1240 struct usb_hcd *hcd,
1241 struct urb *urb,
1242 gfp_t mem_flags
1243 ) {
1244 struct dummy_hcd *dum_hcd;
1245 struct urbp *urbp;
1246 unsigned long flags;
1247 int rc;
1248
1249 urbp = kmalloc(sizeof *urbp, mem_flags);
1250 if (!urbp)
1251 return -ENOMEM;
1252 urbp->urb = urb;
1253 urbp->miter_started = 0;
1254
1255 dum_hcd = hcd_to_dummy_hcd(hcd);
1256 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1257
1258 rc = dummy_validate_stream(dum_hcd, urb);
1259 if (rc) {
1260 kfree(urbp);
1261 goto done;
1262 }
1263
1264 rc = usb_hcd_link_urb_to_ep(hcd, urb);
1265 if (rc) {
1266 kfree(urbp);
1267 goto done;
1268 }
1269
1270 if (!dum_hcd->udev) {
1271 dum_hcd->udev = urb->dev;
1272 usb_get_dev(dum_hcd->udev);
1273 } else if (unlikely(dum_hcd->udev != urb->dev))
1274 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1275
1276 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1277 urb->hcpriv = urbp;
1278 if (!dum_hcd->next_frame_urbp)
1279 dum_hcd->next_frame_urbp = urbp;
1280 if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1281 urb->error_count = 1; /* mark as a new urb */
1282
1283 /* kick the scheduler, it'll do the rest */
1284 if (!timer_pending(&dum_hcd->timer))
1285 mod_timer(&dum_hcd->timer, jiffies + 1);
1286
1287 done:
1288 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1289 return rc;
1290 }
1291
1292 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1293 {
1294 struct dummy_hcd *dum_hcd;
1295 unsigned long flags;
1296 int rc;
1297
1298 /* giveback happens automatically in timer callback,
1299 * so make sure the callback happens */
1300 dum_hcd = hcd_to_dummy_hcd(hcd);
1301 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1302
1303 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1304 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1305 !list_empty(&dum_hcd->urbp_list))
1306 mod_timer(&dum_hcd->timer, jiffies);
1307
1308 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1309 return rc;
1310 }
1311
1312 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1313 u32 len)
1314 {
1315 void *ubuf, *rbuf;
1316 struct urbp *urbp = urb->hcpriv;
1317 int to_host;
1318 struct sg_mapping_iter *miter = &urbp->miter;
1319 u32 trans = 0;
1320 u32 this_sg;
1321 bool next_sg;
1322
1323 to_host = usb_pipein(urb->pipe);
1324 rbuf = req->req.buf + req->req.actual;
1325
1326 if (!urb->num_sgs) {
1327 ubuf = urb->transfer_buffer + urb->actual_length;
1328 if (to_host)
1329 memcpy(ubuf, rbuf, len);
1330 else
1331 memcpy(rbuf, ubuf, len);
1332 return len;
1333 }
1334
1335 if (!urbp->miter_started) {
1336 u32 flags = SG_MITER_ATOMIC;
1337
1338 if (to_host)
1339 flags |= SG_MITER_TO_SG;
1340 else
1341 flags |= SG_MITER_FROM_SG;
1342
1343 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1344 urbp->miter_started = 1;
1345 }
1346 next_sg = sg_miter_next(miter);
1347 if (next_sg == false) {
1348 WARN_ON_ONCE(1);
1349 return -EINVAL;
1350 }
1351 do {
1352 ubuf = miter->addr;
1353 this_sg = min_t(u32, len, miter->length);
1354 miter->consumed = this_sg;
1355 trans += this_sg;
1356
1357 if (to_host)
1358 memcpy(ubuf, rbuf, this_sg);
1359 else
1360 memcpy(rbuf, ubuf, this_sg);
1361 len -= this_sg;
1362
1363 if (!len)
1364 break;
1365 next_sg = sg_miter_next(miter);
1366 if (next_sg == false) {
1367 WARN_ON_ONCE(1);
1368 return -EINVAL;
1369 }
1370
1371 rbuf += this_sg;
1372 } while (1);
1373
1374 sg_miter_stop(miter);
1375 return trans;
1376 }
1377
1378 /* transfer up to a frame's worth; caller must own lock */
1379 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1380 struct dummy_ep *ep, int limit, int *status)
1381 {
1382 struct dummy *dum = dum_hcd->dum;
1383 struct dummy_request *req;
1384 int sent = 0;
1385
1386 top:
1387 /* if there's no request queued, the device is NAKing; return */
1388 list_for_each_entry(req, &ep->queue, queue) {
1389 unsigned host_len, dev_len, len;
1390 int is_short, to_host;
1391 int rescan = 0;
1392
1393 if (dummy_ep_stream_en(dum_hcd, urb)) {
1394 if ((urb->stream_id != req->req.stream_id))
1395 continue;
1396 }
1397
1398 /* 1..N packets of ep->ep.maxpacket each ... the last one
1399 * may be short (including zero length).
1400 *
1401 * writer can send a zlp explicitly (length 0) or implicitly
1402 * (length mod maxpacket zero, and 'zero' flag); they always
1403 * terminate reads.
1404 */
1405 host_len = urb->transfer_buffer_length - urb->actual_length;
1406 dev_len = req->req.length - req->req.actual;
1407 len = min(host_len, dev_len);
1408
1409 /* FIXME update emulated data toggle too */
1410
1411 to_host = usb_pipein(urb->pipe);
1412 if (unlikely(len == 0))
1413 is_short = 1;
1414 else {
1415 /* not enough bandwidth left? */
1416 if (limit < ep->ep.maxpacket && limit < len)
1417 break;
1418 len = min_t(unsigned, len, limit);
1419 if (len == 0)
1420 break;
1421
1422 /* send multiple of maxpacket first, then remainder */
1423 if (len >= ep->ep.maxpacket) {
1424 is_short = 0;
1425 if (len % ep->ep.maxpacket)
1426 rescan = 1;
1427 len -= len % ep->ep.maxpacket;
1428 } else {
1429 is_short = 1;
1430 }
1431
1432 len = dummy_perform_transfer(urb, req, len);
1433
1434 ep->last_io = jiffies;
1435 if ((int)len < 0) {
1436 req->req.status = len;
1437 } else {
1438 limit -= len;
1439 sent += len;
1440 urb->actual_length += len;
1441 req->req.actual += len;
1442 }
1443 }
1444
1445 /* short packets terminate, maybe with overflow/underflow.
1446 * it's only really an error to write too much.
1447 *
1448 * partially filling a buffer optionally blocks queue advances
1449 * (so completion handlers can clean up the queue) but we don't
1450 * need to emulate such data-in-flight.
1451 */
1452 if (is_short) {
1453 if (host_len == dev_len) {
1454 req->req.status = 0;
1455 *status = 0;
1456 } else if (to_host) {
1457 req->req.status = 0;
1458 if (dev_len > host_len)
1459 *status = -EOVERFLOW;
1460 else
1461 *status = 0;
1462 } else {
1463 *status = 0;
1464 if (host_len > dev_len)
1465 req->req.status = -EOVERFLOW;
1466 else
1467 req->req.status = 0;
1468 }
1469
1470 /*
1471 * many requests terminate without a short packet.
1472 * send a zlp if demanded by flags.
1473 */
1474 } else {
1475 if (req->req.length == req->req.actual) {
1476 if (req->req.zero && to_host)
1477 rescan = 1;
1478 else
1479 req->req.status = 0;
1480 }
1481 if (urb->transfer_buffer_length == urb->actual_length) {
1482 if (urb->transfer_flags & URB_ZERO_PACKET &&
1483 !to_host)
1484 rescan = 1;
1485 else
1486 *status = 0;
1487 }
1488 }
1489
1490 /* device side completion --> continuable */
1491 if (req->req.status != -EINPROGRESS) {
1492 list_del_init(&req->queue);
1493
1494 spin_unlock(&dum->lock);
1495 usb_gadget_giveback_request(&ep->ep, &req->req);
1496 spin_lock(&dum->lock);
1497
1498 /* requests might have been unlinked... */
1499 rescan = 1;
1500 }
1501
1502 /* host side completion --> terminate */
1503 if (*status != -EINPROGRESS)
1504 break;
1505
1506 /* rescan to continue with any other queued i/o */
1507 if (rescan)
1508 goto top;
1509 }
1510 return sent;
1511 }
1512
1513 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1514 {
1515 int limit = ep->ep.maxpacket;
1516
1517 if (dum->gadget.speed == USB_SPEED_HIGH) {
1518 int tmp;
1519
1520 /* high bandwidth mode */
1521 tmp = usb_endpoint_maxp(ep->desc);
1522 tmp = (tmp >> 11) & 0x03;
1523 tmp *= 8 /* applies to entire frame */;
1524 limit += limit * tmp;
1525 }
1526 if (dum->gadget.speed == USB_SPEED_SUPER) {
1527 switch (usb_endpoint_type(ep->desc)) {
1528 case USB_ENDPOINT_XFER_ISOC:
1529 /* Sec. 4.4.8.2 USB3.0 Spec */
1530 limit = 3 * 16 * 1024 * 8;
1531 break;
1532 case USB_ENDPOINT_XFER_INT:
1533 /* Sec. 4.4.7.2 USB3.0 Spec */
1534 limit = 3 * 1024 * 8;
1535 break;
1536 case USB_ENDPOINT_XFER_BULK:
1537 default:
1538 break;
1539 }
1540 }
1541 return limit;
1542 }
1543
1544 #define is_active(dum_hcd) ((dum_hcd->port_status & \
1545 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1546 USB_PORT_STAT_SUSPEND)) \
1547 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1548
1549 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1550 {
1551 int i;
1552
1553 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1554 dum->ss_hcd : dum->hs_hcd)))
1555 return NULL;
1556 if (!dum->ints_enabled)
1557 return NULL;
1558 if ((address & ~USB_DIR_IN) == 0)
1559 return &dum->ep[0];
1560 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1561 struct dummy_ep *ep = &dum->ep[i];
1562
1563 if (!ep->desc)
1564 continue;
1565 if (ep->desc->bEndpointAddress == address)
1566 return ep;
1567 }
1568 return NULL;
1569 }
1570
1571 #undef is_active
1572
1573 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1574 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1575 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1576 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1577 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1578 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1579
1580
1581 /**
1582 * handle_control_request() - handles all control transfers
1583 * @dum: pointer to dummy (the_controller)
1584 * @urb: the urb request to handle
1585 * @setup: pointer to the setup data for a USB device control
1586 * request
1587 * @status: pointer to request handling status
1588 *
1589 * Return 0 - if the request was handled
1590 * 1 - if the request wasn't handles
1591 * error code on error
1592 */
1593 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1594 struct usb_ctrlrequest *setup,
1595 int *status)
1596 {
1597 struct dummy_ep *ep2;
1598 struct dummy *dum = dum_hcd->dum;
1599 int ret_val = 1;
1600 unsigned w_index;
1601 unsigned w_value;
1602
1603 w_index = le16_to_cpu(setup->wIndex);
1604 w_value = le16_to_cpu(setup->wValue);
1605 switch (setup->bRequest) {
1606 case USB_REQ_SET_ADDRESS:
1607 if (setup->bRequestType != Dev_Request)
1608 break;
1609 dum->address = w_value;
1610 *status = 0;
1611 dev_dbg(udc_dev(dum), "set_address = %d\n",
1612 w_value);
1613 ret_val = 0;
1614 break;
1615 case USB_REQ_SET_FEATURE:
1616 if (setup->bRequestType == Dev_Request) {
1617 ret_val = 0;
1618 switch (w_value) {
1619 case USB_DEVICE_REMOTE_WAKEUP:
1620 break;
1621 case USB_DEVICE_B_HNP_ENABLE:
1622 dum->gadget.b_hnp_enable = 1;
1623 break;
1624 case USB_DEVICE_A_HNP_SUPPORT:
1625 dum->gadget.a_hnp_support = 1;
1626 break;
1627 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1628 dum->gadget.a_alt_hnp_support = 1;
1629 break;
1630 case USB_DEVICE_U1_ENABLE:
1631 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1632 HCD_USB3)
1633 w_value = USB_DEV_STAT_U1_ENABLED;
1634 else
1635 ret_val = -EOPNOTSUPP;
1636 break;
1637 case USB_DEVICE_U2_ENABLE:
1638 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1639 HCD_USB3)
1640 w_value = USB_DEV_STAT_U2_ENABLED;
1641 else
1642 ret_val = -EOPNOTSUPP;
1643 break;
1644 case USB_DEVICE_LTM_ENABLE:
1645 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1646 HCD_USB3)
1647 w_value = USB_DEV_STAT_LTM_ENABLED;
1648 else
1649 ret_val = -EOPNOTSUPP;
1650 break;
1651 default:
1652 ret_val = -EOPNOTSUPP;
1653 }
1654 if (ret_val == 0) {
1655 dum->devstatus |= (1 << w_value);
1656 *status = 0;
1657 }
1658 } else if (setup->bRequestType == Ep_Request) {
1659 /* endpoint halt */
1660 ep2 = find_endpoint(dum, w_index);
1661 if (!ep2 || ep2->ep.name == ep0name) {
1662 ret_val = -EOPNOTSUPP;
1663 break;
1664 }
1665 ep2->halted = 1;
1666 ret_val = 0;
1667 *status = 0;
1668 }
1669 break;
1670 case USB_REQ_CLEAR_FEATURE:
1671 if (setup->bRequestType == Dev_Request) {
1672 ret_val = 0;
1673 switch (w_value) {
1674 case USB_DEVICE_REMOTE_WAKEUP:
1675 w_value = USB_DEVICE_REMOTE_WAKEUP;
1676 break;
1677 case USB_DEVICE_U1_ENABLE:
1678 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1679 HCD_USB3)
1680 w_value = USB_DEV_STAT_U1_ENABLED;
1681 else
1682 ret_val = -EOPNOTSUPP;
1683 break;
1684 case USB_DEVICE_U2_ENABLE:
1685 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1686 HCD_USB3)
1687 w_value = USB_DEV_STAT_U2_ENABLED;
1688 else
1689 ret_val = -EOPNOTSUPP;
1690 break;
1691 case USB_DEVICE_LTM_ENABLE:
1692 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1693 HCD_USB3)
1694 w_value = USB_DEV_STAT_LTM_ENABLED;
1695 else
1696 ret_val = -EOPNOTSUPP;
1697 break;
1698 default:
1699 ret_val = -EOPNOTSUPP;
1700 break;
1701 }
1702 if (ret_val == 0) {
1703 dum->devstatus &= ~(1 << w_value);
1704 *status = 0;
1705 }
1706 } else if (setup->bRequestType == Ep_Request) {
1707 /* endpoint halt */
1708 ep2 = find_endpoint(dum, w_index);
1709 if (!ep2) {
1710 ret_val = -EOPNOTSUPP;
1711 break;
1712 }
1713 if (!ep2->wedged)
1714 ep2->halted = 0;
1715 ret_val = 0;
1716 *status = 0;
1717 }
1718 break;
1719 case USB_REQ_GET_STATUS:
1720 if (setup->bRequestType == Dev_InRequest
1721 || setup->bRequestType == Intf_InRequest
1722 || setup->bRequestType == Ep_InRequest) {
1723 char *buf;
1724 /*
1725 * device: remote wakeup, selfpowered
1726 * interface: nothing
1727 * endpoint: halt
1728 */
1729 buf = (char *)urb->transfer_buffer;
1730 if (urb->transfer_buffer_length > 0) {
1731 if (setup->bRequestType == Ep_InRequest) {
1732 ep2 = find_endpoint(dum, w_index);
1733 if (!ep2) {
1734 ret_val = -EOPNOTSUPP;
1735 break;
1736 }
1737 buf[0] = ep2->halted;
1738 } else if (setup->bRequestType ==
1739 Dev_InRequest) {
1740 buf[0] = (u8)dum->devstatus;
1741 } else
1742 buf[0] = 0;
1743 }
1744 if (urb->transfer_buffer_length > 1)
1745 buf[1] = 0;
1746 urb->actual_length = min_t(u32, 2,
1747 urb->transfer_buffer_length);
1748 ret_val = 0;
1749 *status = 0;
1750 }
1751 break;
1752 }
1753 return ret_val;
1754 }
1755
1756 /* drive both sides of the transfers; looks like irq handlers to
1757 * both drivers except the callbacks aren't in_irq().
1758 */
1759 static void dummy_timer(unsigned long _dum_hcd)
1760 {
1761 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1762 struct dummy *dum = dum_hcd->dum;
1763 struct urbp *urbp, *tmp;
1764 unsigned long flags;
1765 int limit, total;
1766 int i;
1767
1768 /* simplistic model for one frame's bandwidth */
1769 switch (dum->gadget.speed) {
1770 case USB_SPEED_LOW:
1771 total = 8/*bytes*/ * 12/*packets*/;
1772 break;
1773 case USB_SPEED_FULL:
1774 total = 64/*bytes*/ * 19/*packets*/;
1775 break;
1776 case USB_SPEED_HIGH:
1777 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1778 break;
1779 case USB_SPEED_SUPER:
1780 /* Bus speed is 500000 bytes/ms, so use a little less */
1781 total = 490000;
1782 break;
1783 default:
1784 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1785 return;
1786 }
1787
1788 /* FIXME if HZ != 1000 this will probably misbehave ... */
1789
1790 /* look at each urb queued by the host side driver */
1791 spin_lock_irqsave(&dum->lock, flags);
1792
1793 if (!dum_hcd->udev) {
1794 dev_err(dummy_dev(dum_hcd),
1795 "timer fired with no URBs pending?\n");
1796 spin_unlock_irqrestore(&dum->lock, flags);
1797 return;
1798 }
1799 dum_hcd->next_frame_urbp = NULL;
1800
1801 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1802 if (!ep_info[i].name)
1803 break;
1804 dum->ep[i].already_seen = 0;
1805 }
1806
1807 restart:
1808 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1809 struct urb *urb;
1810 struct dummy_request *req;
1811 u8 address;
1812 struct dummy_ep *ep = NULL;
1813 int type;
1814 int status = -EINPROGRESS;
1815
1816 /* stop when we reach URBs queued after the timer interrupt */
1817 if (urbp == dum_hcd->next_frame_urbp)
1818 break;
1819
1820 urb = urbp->urb;
1821 if (urb->unlinked)
1822 goto return_urb;
1823 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1824 continue;
1825 type = usb_pipetype(urb->pipe);
1826
1827 /* used up this frame's non-periodic bandwidth?
1828 * FIXME there's infinite bandwidth for control and
1829 * periodic transfers ... unrealistic.
1830 */
1831 if (total <= 0 && type == PIPE_BULK)
1832 continue;
1833
1834 /* find the gadget's ep for this request (if configured) */
1835 address = usb_pipeendpoint (urb->pipe);
1836 if (usb_pipein(urb->pipe))
1837 address |= USB_DIR_IN;
1838 ep = find_endpoint(dum, address);
1839 if (!ep) {
1840 /* set_configuration() disagreement */
1841 dev_dbg(dummy_dev(dum_hcd),
1842 "no ep configured for urb %p\n",
1843 urb);
1844 status = -EPROTO;
1845 goto return_urb;
1846 }
1847
1848 if (ep->already_seen)
1849 continue;
1850 ep->already_seen = 1;
1851 if (ep == &dum->ep[0] && urb->error_count) {
1852 ep->setup_stage = 1; /* a new urb */
1853 urb->error_count = 0;
1854 }
1855 if (ep->halted && !ep->setup_stage) {
1856 /* NOTE: must not be iso! */
1857 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1858 ep->ep.name, urb);
1859 status = -EPIPE;
1860 goto return_urb;
1861 }
1862 /* FIXME make sure both ends agree on maxpacket */
1863
1864 /* handle control requests */
1865 if (ep == &dum->ep[0] && ep->setup_stage) {
1866 struct usb_ctrlrequest setup;
1867 int value = 1;
1868
1869 setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1870 /* paranoia, in case of stale queued data */
1871 list_for_each_entry(req, &ep->queue, queue) {
1872 list_del_init(&req->queue);
1873 req->req.status = -EOVERFLOW;
1874 dev_dbg(udc_dev(dum), "stale req = %p\n",
1875 req);
1876
1877 spin_unlock(&dum->lock);
1878 usb_gadget_giveback_request(&ep->ep, &req->req);
1879 spin_lock(&dum->lock);
1880 ep->already_seen = 0;
1881 goto restart;
1882 }
1883
1884 /* gadget driver never sees set_address or operations
1885 * on standard feature flags. some hardware doesn't
1886 * even expose them.
1887 */
1888 ep->last_io = jiffies;
1889 ep->setup_stage = 0;
1890 ep->halted = 0;
1891
1892 value = handle_control_request(dum_hcd, urb, &setup,
1893 &status);
1894
1895 /* gadget driver handles all other requests. block
1896 * until setup() returns; no reentrancy issues etc.
1897 */
1898 if (value > 0) {
1899 ++dum->callback_usage;
1900 spin_unlock(&dum->lock);
1901 value = dum->driver->setup(&dum->gadget,
1902 &setup);
1903 spin_lock(&dum->lock);
1904 --dum->callback_usage;
1905
1906 if (value >= 0) {
1907 /* no delays (max 64KB data stage) */
1908 limit = 64*1024;
1909 goto treat_control_like_bulk;
1910 }
1911 /* error, see below */
1912 }
1913
1914 if (value < 0) {
1915 if (value != -EOPNOTSUPP)
1916 dev_dbg(udc_dev(dum),
1917 "setup --> %d\n",
1918 value);
1919 status = -EPIPE;
1920 urb->actual_length = 0;
1921 }
1922
1923 goto return_urb;
1924 }
1925
1926 /* non-control requests */
1927 limit = total;
1928 switch (usb_pipetype(urb->pipe)) {
1929 case PIPE_ISOCHRONOUS:
1930 /* FIXME is it urb->interval since the last xfer?
1931 * use urb->iso_frame_desc[i].
1932 * complete whether or not ep has requests queued.
1933 * report random errors, to debug drivers.
1934 */
1935 limit = max(limit, periodic_bytes(dum, ep));
1936 status = -ENOSYS;
1937 break;
1938
1939 case PIPE_INTERRUPT:
1940 /* FIXME is it urb->interval since the last xfer?
1941 * this almost certainly polls too fast.
1942 */
1943 limit = max(limit, periodic_bytes(dum, ep));
1944 /* FALLTHROUGH */
1945
1946 default:
1947 treat_control_like_bulk:
1948 ep->last_io = jiffies;
1949 total -= transfer(dum_hcd, urb, ep, limit, &status);
1950 break;
1951 }
1952
1953 /* incomplete transfer? */
1954 if (status == -EINPROGRESS)
1955 continue;
1956
1957 return_urb:
1958 list_del(&urbp->urbp_list);
1959 kfree(urbp);
1960 if (ep)
1961 ep->already_seen = ep->setup_stage = 0;
1962
1963 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1964 spin_unlock(&dum->lock);
1965 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1966 spin_lock(&dum->lock);
1967
1968 goto restart;
1969 }
1970
1971 if (list_empty(&dum_hcd->urbp_list)) {
1972 usb_put_dev(dum_hcd->udev);
1973 dum_hcd->udev = NULL;
1974 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1975 /* want a 1 msec delay here */
1976 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1977 }
1978
1979 spin_unlock_irqrestore(&dum->lock, flags);
1980 }
1981
1982 /*-------------------------------------------------------------------------*/
1983
1984 #define PORT_C_MASK \
1985 ((USB_PORT_STAT_C_CONNECTION \
1986 | USB_PORT_STAT_C_ENABLE \
1987 | USB_PORT_STAT_C_SUSPEND \
1988 | USB_PORT_STAT_C_OVERCURRENT \
1989 | USB_PORT_STAT_C_RESET) << 16)
1990
1991 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1992 {
1993 struct dummy_hcd *dum_hcd;
1994 unsigned long flags;
1995 int retval = 0;
1996
1997 dum_hcd = hcd_to_dummy_hcd(hcd);
1998
1999 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2000 if (!HCD_HW_ACCESSIBLE(hcd))
2001 goto done;
2002
2003 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2004 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2005 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2006 set_link_state(dum_hcd);
2007 }
2008
2009 if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2010 *buf = (1 << 1);
2011 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2012 dum_hcd->port_status);
2013 retval = 1;
2014 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2015 usb_hcd_resume_root_hub(hcd);
2016 }
2017 done:
2018 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2019 return retval;
2020 }
2021
2022 /* usb 3.0 root hub device descriptor */
2023 static struct {
2024 struct usb_bos_descriptor bos;
2025 struct usb_ss_cap_descriptor ss_cap;
2026 } __packed usb3_bos_desc = {
2027
2028 .bos = {
2029 .bLength = USB_DT_BOS_SIZE,
2030 .bDescriptorType = USB_DT_BOS,
2031 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
2032 .bNumDeviceCaps = 1,
2033 },
2034 .ss_cap = {
2035 .bLength = USB_DT_USB_SS_CAP_SIZE,
2036 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
2037 .bDevCapabilityType = USB_SS_CAP_TYPE,
2038 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
2039 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
2040 },
2041 };
2042
2043 static inline void
2044 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2045 {
2046 memset(desc, 0, sizeof *desc);
2047 desc->bDescriptorType = USB_DT_SS_HUB;
2048 desc->bDescLength = 12;
2049 desc->wHubCharacteristics = cpu_to_le16(
2050 HUB_CHAR_INDV_PORT_LPSM |
2051 HUB_CHAR_COMMON_OCPM);
2052 desc->bNbrPorts = 1;
2053 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2054 desc->u.ss.DeviceRemovable = 0;
2055 }
2056
2057 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2058 {
2059 memset(desc, 0, sizeof *desc);
2060 desc->bDescriptorType = USB_DT_HUB;
2061 desc->bDescLength = 9;
2062 desc->wHubCharacteristics = cpu_to_le16(
2063 HUB_CHAR_INDV_PORT_LPSM |
2064 HUB_CHAR_COMMON_OCPM);
2065 desc->bNbrPorts = 1;
2066 desc->u.hs.DeviceRemovable[0] = 0;
2067 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */
2068 }
2069
2070 static int dummy_hub_control(
2071 struct usb_hcd *hcd,
2072 u16 typeReq,
2073 u16 wValue,
2074 u16 wIndex,
2075 char *buf,
2076 u16 wLength
2077 ) {
2078 struct dummy_hcd *dum_hcd;
2079 int retval = 0;
2080 unsigned long flags;
2081
2082 if (!HCD_HW_ACCESSIBLE(hcd))
2083 return -ETIMEDOUT;
2084
2085 dum_hcd = hcd_to_dummy_hcd(hcd);
2086
2087 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2088 switch (typeReq) {
2089 case ClearHubFeature:
2090 break;
2091 case ClearPortFeature:
2092 switch (wValue) {
2093 case USB_PORT_FEAT_SUSPEND:
2094 if (hcd->speed == HCD_USB3) {
2095 dev_dbg(dummy_dev(dum_hcd),
2096 "USB_PORT_FEAT_SUSPEND req not "
2097 "supported for USB 3.0 roothub\n");
2098 goto error;
2099 }
2100 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2101 /* 20msec resume signaling */
2102 dum_hcd->resuming = 1;
2103 dum_hcd->re_timeout = jiffies +
2104 msecs_to_jiffies(20);
2105 }
2106 break;
2107 case USB_PORT_FEAT_POWER:
2108 dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2109 if (hcd->speed == HCD_USB3)
2110 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2111 else
2112 dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2113 set_link_state(dum_hcd);
2114 break;
2115 default:
2116 dum_hcd->port_status &= ~(1 << wValue);
2117 set_link_state(dum_hcd);
2118 }
2119 break;
2120 case GetHubDescriptor:
2121 if (hcd->speed == HCD_USB3 &&
2122 (wLength < USB_DT_SS_HUB_SIZE ||
2123 wValue != (USB_DT_SS_HUB << 8))) {
2124 dev_dbg(dummy_dev(dum_hcd),
2125 "Wrong hub descriptor type for "
2126 "USB 3.0 roothub.\n");
2127 goto error;
2128 }
2129 if (hcd->speed == HCD_USB3)
2130 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2131 else
2132 hub_descriptor((struct usb_hub_descriptor *) buf);
2133 break;
2134
2135 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2136 if (hcd->speed != HCD_USB3)
2137 goto error;
2138
2139 if ((wValue >> 8) != USB_DT_BOS)
2140 goto error;
2141
2142 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2143 retval = sizeof(usb3_bos_desc);
2144 break;
2145
2146 case GetHubStatus:
2147 *(__le32 *) buf = cpu_to_le32(0);
2148 break;
2149 case GetPortStatus:
2150 if (wIndex != 1)
2151 retval = -EPIPE;
2152
2153 /* whoever resets or resumes must GetPortStatus to
2154 * complete it!!
2155 */
2156 if (dum_hcd->resuming &&
2157 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2158 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2159 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2160 }
2161 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2162 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2163 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2164 dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2165 if (dum_hcd->dum->pullup) {
2166 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2167
2168 if (hcd->speed < HCD_USB3) {
2169 switch (dum_hcd->dum->gadget.speed) {
2170 case USB_SPEED_HIGH:
2171 dum_hcd->port_status |=
2172 USB_PORT_STAT_HIGH_SPEED;
2173 break;
2174 case USB_SPEED_LOW:
2175 dum_hcd->dum->gadget.ep0->
2176 maxpacket = 8;
2177 dum_hcd->port_status |=
2178 USB_PORT_STAT_LOW_SPEED;
2179 break;
2180 default:
2181 dum_hcd->dum->gadget.speed =
2182 USB_SPEED_FULL;
2183 break;
2184 }
2185 }
2186 }
2187 }
2188 set_link_state(dum_hcd);
2189 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2190 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2191 break;
2192 case SetHubFeature:
2193 retval = -EPIPE;
2194 break;
2195 case SetPortFeature:
2196 switch (wValue) {
2197 case USB_PORT_FEAT_LINK_STATE:
2198 if (hcd->speed != HCD_USB3) {
2199 dev_dbg(dummy_dev(dum_hcd),
2200 "USB_PORT_FEAT_LINK_STATE req not "
2201 "supported for USB 2.0 roothub\n");
2202 goto error;
2203 }
2204 /*
2205 * Since this is dummy we don't have an actual link so
2206 * there is nothing to do for the SET_LINK_STATE cmd
2207 */
2208 break;
2209 case USB_PORT_FEAT_U1_TIMEOUT:
2210 case USB_PORT_FEAT_U2_TIMEOUT:
2211 /* TODO: add suspend/resume support! */
2212 if (hcd->speed != HCD_USB3) {
2213 dev_dbg(dummy_dev(dum_hcd),
2214 "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2215 "supported for USB 2.0 roothub\n");
2216 goto error;
2217 }
2218 break;
2219 case USB_PORT_FEAT_SUSPEND:
2220 /* Applicable only for USB2.0 hub */
2221 if (hcd->speed == HCD_USB3) {
2222 dev_dbg(dummy_dev(dum_hcd),
2223 "USB_PORT_FEAT_SUSPEND req not "
2224 "supported for USB 3.0 roothub\n");
2225 goto error;
2226 }
2227 if (dum_hcd->active) {
2228 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2229
2230 /* HNP would happen here; for now we
2231 * assume b_bus_req is always true.
2232 */
2233 set_link_state(dum_hcd);
2234 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2235 & dum_hcd->dum->devstatus) != 0)
2236 dev_dbg(dummy_dev(dum_hcd),
2237 "no HNP yet!\n");
2238 }
2239 break;
2240 case USB_PORT_FEAT_POWER:
2241 if (hcd->speed == HCD_USB3)
2242 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2243 else
2244 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2245 set_link_state(dum_hcd);
2246 break;
2247 case USB_PORT_FEAT_BH_PORT_RESET:
2248 /* Applicable only for USB3.0 hub */
2249 if (hcd->speed != HCD_USB3) {
2250 dev_dbg(dummy_dev(dum_hcd),
2251 "USB_PORT_FEAT_BH_PORT_RESET req not "
2252 "supported for USB 2.0 roothub\n");
2253 goto error;
2254 }
2255 /* FALLS THROUGH */
2256 case USB_PORT_FEAT_RESET:
2257 /* if it's already enabled, disable */
2258 if (hcd->speed == HCD_USB3) {
2259 dum_hcd->port_status = 0;
2260 dum_hcd->port_status =
2261 (USB_SS_PORT_STAT_POWER |
2262 USB_PORT_STAT_CONNECTION |
2263 USB_PORT_STAT_RESET);
2264 } else
2265 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2266 | USB_PORT_STAT_LOW_SPEED
2267 | USB_PORT_STAT_HIGH_SPEED);
2268 /*
2269 * We want to reset device status. All but the
2270 * Self powered feature
2271 */
2272 dum_hcd->dum->devstatus &=
2273 (1 << USB_DEVICE_SELF_POWERED);
2274 /*
2275 * FIXME USB3.0: what is the correct reset signaling
2276 * interval? Is it still 50msec as for HS?
2277 */
2278 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2279 /* FALLS THROUGH */
2280 default:
2281 if (hcd->speed == HCD_USB3) {
2282 if ((dum_hcd->port_status &
2283 USB_SS_PORT_STAT_POWER) != 0) {
2284 dum_hcd->port_status |= (1 << wValue);
2285 }
2286 } else
2287 if ((dum_hcd->port_status &
2288 USB_PORT_STAT_POWER) != 0) {
2289 dum_hcd->port_status |= (1 << wValue);
2290 }
2291 set_link_state(dum_hcd);
2292 }
2293 break;
2294 case GetPortErrorCount:
2295 if (hcd->speed != HCD_USB3) {
2296 dev_dbg(dummy_dev(dum_hcd),
2297 "GetPortErrorCount req not "
2298 "supported for USB 2.0 roothub\n");
2299 goto error;
2300 }
2301 /* We'll always return 0 since this is a dummy hub */
2302 *(__le32 *) buf = cpu_to_le32(0);
2303 break;
2304 case SetHubDepth:
2305 if (hcd->speed != HCD_USB3) {
2306 dev_dbg(dummy_dev(dum_hcd),
2307 "SetHubDepth req not supported for "
2308 "USB 2.0 roothub\n");
2309 goto error;
2310 }
2311 break;
2312 default:
2313 dev_dbg(dummy_dev(dum_hcd),
2314 "hub control req%04x v%04x i%04x l%d\n",
2315 typeReq, wValue, wIndex, wLength);
2316 error:
2317 /* "protocol stall" on error */
2318 retval = -EPIPE;
2319 }
2320 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2321
2322 if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2323 usb_hcd_poll_rh_status(hcd);
2324 return retval;
2325 }
2326
2327 static int dummy_bus_suspend(struct usb_hcd *hcd)
2328 {
2329 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2330
2331 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2332
2333 spin_lock_irq(&dum_hcd->dum->lock);
2334 dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2335 set_link_state(dum_hcd);
2336 hcd->state = HC_STATE_SUSPENDED;
2337 spin_unlock_irq(&dum_hcd->dum->lock);
2338 return 0;
2339 }
2340
2341 static int dummy_bus_resume(struct usb_hcd *hcd)
2342 {
2343 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2344 int rc = 0;
2345
2346 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2347
2348 spin_lock_irq(&dum_hcd->dum->lock);
2349 if (!HCD_HW_ACCESSIBLE(hcd)) {
2350 rc = -ESHUTDOWN;
2351 } else {
2352 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2353 set_link_state(dum_hcd);
2354 if (!list_empty(&dum_hcd->urbp_list))
2355 mod_timer(&dum_hcd->timer, jiffies);
2356 hcd->state = HC_STATE_RUNNING;
2357 }
2358 spin_unlock_irq(&dum_hcd->dum->lock);
2359 return rc;
2360 }
2361
2362 /*-------------------------------------------------------------------------*/
2363
2364 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2365 {
2366 int ep = usb_pipeendpoint(urb->pipe);
2367
2368 return snprintf(buf, size,
2369 "urb/%p %s ep%d%s%s len %d/%d\n",
2370 urb,
2371 ({ char *s;
2372 switch (urb->dev->speed) {
2373 case USB_SPEED_LOW:
2374 s = "ls";
2375 break;
2376 case USB_SPEED_FULL:
2377 s = "fs";
2378 break;
2379 case USB_SPEED_HIGH:
2380 s = "hs";
2381 break;
2382 case USB_SPEED_SUPER:
2383 s = "ss";
2384 break;
2385 default:
2386 s = "?";
2387 break;
2388 } s; }),
2389 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2390 ({ char *s; \
2391 switch (usb_pipetype(urb->pipe)) { \
2392 case PIPE_CONTROL: \
2393 s = ""; \
2394 break; \
2395 case PIPE_BULK: \
2396 s = "-bulk"; \
2397 break; \
2398 case PIPE_INTERRUPT: \
2399 s = "-int"; \
2400 break; \
2401 default: \
2402 s = "-iso"; \
2403 break; \
2404 } s; }),
2405 urb->actual_length, urb->transfer_buffer_length);
2406 }
2407
2408 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2409 char *buf)
2410 {
2411 struct usb_hcd *hcd = dev_get_drvdata(dev);
2412 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2413 struct urbp *urbp;
2414 size_t size = 0;
2415 unsigned long flags;
2416
2417 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2418 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2419 size_t temp;
2420
2421 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2422 buf += temp;
2423 size += temp;
2424 }
2425 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2426
2427 return size;
2428 }
2429 static DEVICE_ATTR_RO(urbs);
2430
2431 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2432 {
2433 init_timer(&dum_hcd->timer);
2434 dum_hcd->timer.function = dummy_timer;
2435 dum_hcd->timer.data = (unsigned long)dum_hcd;
2436 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2437 dum_hcd->stream_en_ep = 0;
2438 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2439 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2440 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2441 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2442 #ifdef CONFIG_USB_OTG
2443 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2444 #endif
2445 return 0;
2446
2447 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2448 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2449 }
2450
2451 static int dummy_start(struct usb_hcd *hcd)
2452 {
2453 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2454
2455 /*
2456 * MASTER side init ... we emulate a root hub that'll only ever
2457 * talk to one device (the slave side). Also appears in sysfs,
2458 * just like more familiar pci-based HCDs.
2459 */
2460 if (!usb_hcd_is_primary_hcd(hcd))
2461 return dummy_start_ss(dum_hcd);
2462
2463 spin_lock_init(&dum_hcd->dum->lock);
2464 init_timer(&dum_hcd->timer);
2465 dum_hcd->timer.function = dummy_timer;
2466 dum_hcd->timer.data = (unsigned long)dum_hcd;
2467 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2468
2469 INIT_LIST_HEAD(&dum_hcd->urbp_list);
2470
2471 hcd->power_budget = POWER_BUDGET;
2472 hcd->state = HC_STATE_RUNNING;
2473 hcd->uses_new_polling = 1;
2474
2475 #ifdef CONFIG_USB_OTG
2476 hcd->self.otg_port = 1;
2477 #endif
2478
2479 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2480 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2481 }
2482
2483 static void dummy_stop(struct usb_hcd *hcd)
2484 {
2485 struct dummy *dum;
2486
2487 dum = hcd_to_dummy_hcd(hcd)->dum;
2488 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2489 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2490 }
2491
2492 /*-------------------------------------------------------------------------*/
2493
2494 static int dummy_h_get_frame(struct usb_hcd *hcd)
2495 {
2496 return dummy_g_get_frame(NULL);
2497 }
2498
2499 static int dummy_setup(struct usb_hcd *hcd)
2500 {
2501 struct dummy *dum;
2502
2503 dum = *((void **)dev_get_platdata(hcd->self.controller));
2504 hcd->self.sg_tablesize = ~0;
2505 if (usb_hcd_is_primary_hcd(hcd)) {
2506 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2507 dum->hs_hcd->dum = dum;
2508 /*
2509 * Mark the first roothub as being USB 2.0.
2510 * The USB 3.0 roothub will be registered later by
2511 * dummy_hcd_probe()
2512 */
2513 hcd->speed = HCD_USB2;
2514 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2515 } else {
2516 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2517 dum->ss_hcd->dum = dum;
2518 hcd->speed = HCD_USB3;
2519 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2520 }
2521 return 0;
2522 }
2523
2524 /* Change a group of bulk endpoints to support multiple stream IDs */
2525 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2526 struct usb_host_endpoint **eps, unsigned int num_eps,
2527 unsigned int num_streams, gfp_t mem_flags)
2528 {
2529 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2530 unsigned long flags;
2531 int max_stream;
2532 int ret_streams = num_streams;
2533 unsigned int index;
2534 unsigned int i;
2535
2536 if (!num_eps)
2537 return -EINVAL;
2538
2539 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2540 for (i = 0; i < num_eps; i++) {
2541 index = dummy_get_ep_idx(&eps[i]->desc);
2542 if ((1 << index) & dum_hcd->stream_en_ep) {
2543 ret_streams = -EINVAL;
2544 goto out;
2545 }
2546 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2547 if (!max_stream) {
2548 ret_streams = -EINVAL;
2549 goto out;
2550 }
2551 if (max_stream < ret_streams) {
2552 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2553 "stream IDs.\n",
2554 eps[i]->desc.bEndpointAddress,
2555 max_stream);
2556 ret_streams = max_stream;
2557 }
2558 }
2559
2560 for (i = 0; i < num_eps; i++) {
2561 index = dummy_get_ep_idx(&eps[i]->desc);
2562 dum_hcd->stream_en_ep |= 1 << index;
2563 set_max_streams_for_pipe(dum_hcd,
2564 usb_endpoint_num(&eps[i]->desc), ret_streams);
2565 }
2566 out:
2567 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2568 return ret_streams;
2569 }
2570
2571 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2572 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2573 struct usb_host_endpoint **eps, unsigned int num_eps,
2574 gfp_t mem_flags)
2575 {
2576 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2577 unsigned long flags;
2578 int ret;
2579 unsigned int index;
2580 unsigned int i;
2581
2582 spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2583 for (i = 0; i < num_eps; i++) {
2584 index = dummy_get_ep_idx(&eps[i]->desc);
2585 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2586 ret = -EINVAL;
2587 goto out;
2588 }
2589 }
2590
2591 for (i = 0; i < num_eps; i++) {
2592 index = dummy_get_ep_idx(&eps[i]->desc);
2593 dum_hcd->stream_en_ep &= ~(1 << index);
2594 set_max_streams_for_pipe(dum_hcd,
2595 usb_endpoint_num(&eps[i]->desc), 0);
2596 }
2597 ret = 0;
2598 out:
2599 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2600 return ret;
2601 }
2602
2603 static struct hc_driver dummy_hcd = {
2604 .description = (char *) driver_name,
2605 .product_desc = "Dummy host controller",
2606 .hcd_priv_size = sizeof(struct dummy_hcd),
2607
2608 .reset = dummy_setup,
2609 .start = dummy_start,
2610 .stop = dummy_stop,
2611
2612 .urb_enqueue = dummy_urb_enqueue,
2613 .urb_dequeue = dummy_urb_dequeue,
2614
2615 .get_frame_number = dummy_h_get_frame,
2616
2617 .hub_status_data = dummy_hub_status,
2618 .hub_control = dummy_hub_control,
2619 .bus_suspend = dummy_bus_suspend,
2620 .bus_resume = dummy_bus_resume,
2621
2622 .alloc_streams = dummy_alloc_streams,
2623 .free_streams = dummy_free_streams,
2624 };
2625
2626 static int dummy_hcd_probe(struct platform_device *pdev)
2627 {
2628 struct dummy *dum;
2629 struct usb_hcd *hs_hcd;
2630 struct usb_hcd *ss_hcd;
2631 int retval;
2632
2633 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2634 dum = *((void **)dev_get_platdata(&pdev->dev));
2635
2636 if (mod_data.is_super_speed)
2637 dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2638 else if (mod_data.is_high_speed)
2639 dummy_hcd.flags = HCD_USB2;
2640 else
2641 dummy_hcd.flags = HCD_USB11;
2642 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2643 if (!hs_hcd)
2644 return -ENOMEM;
2645 hs_hcd->has_tt = 1;
2646
2647 retval = usb_add_hcd(hs_hcd, 0, 0);
2648 if (retval)
2649 goto put_usb2_hcd;
2650
2651 if (mod_data.is_super_speed) {
2652 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2653 dev_name(&pdev->dev), hs_hcd);
2654 if (!ss_hcd) {
2655 retval = -ENOMEM;
2656 goto dealloc_usb2_hcd;
2657 }
2658
2659 retval = usb_add_hcd(ss_hcd, 0, 0);
2660 if (retval)
2661 goto put_usb3_hcd;
2662 }
2663 return 0;
2664
2665 put_usb3_hcd:
2666 usb_put_hcd(ss_hcd);
2667 dealloc_usb2_hcd:
2668 usb_remove_hcd(hs_hcd);
2669 put_usb2_hcd:
2670 usb_put_hcd(hs_hcd);
2671 dum->hs_hcd = dum->ss_hcd = NULL;
2672 return retval;
2673 }
2674
2675 static int dummy_hcd_remove(struct platform_device *pdev)
2676 {
2677 struct dummy *dum;
2678
2679 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2680
2681 if (dum->ss_hcd) {
2682 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2683 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2684 }
2685
2686 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2687 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2688
2689 dum->hs_hcd = NULL;
2690 dum->ss_hcd = NULL;
2691
2692 return 0;
2693 }
2694
2695 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2696 {
2697 struct usb_hcd *hcd;
2698 struct dummy_hcd *dum_hcd;
2699 int rc = 0;
2700
2701 dev_dbg(&pdev->dev, "%s\n", __func__);
2702
2703 hcd = platform_get_drvdata(pdev);
2704 dum_hcd = hcd_to_dummy_hcd(hcd);
2705 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2706 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2707 rc = -EBUSY;
2708 } else
2709 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2710 return rc;
2711 }
2712
2713 static int dummy_hcd_resume(struct platform_device *pdev)
2714 {
2715 struct usb_hcd *hcd;
2716
2717 dev_dbg(&pdev->dev, "%s\n", __func__);
2718
2719 hcd = platform_get_drvdata(pdev);
2720 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2721 usb_hcd_poll_rh_status(hcd);
2722 return 0;
2723 }
2724
2725 static struct platform_driver dummy_hcd_driver = {
2726 .probe = dummy_hcd_probe,
2727 .remove = dummy_hcd_remove,
2728 .suspend = dummy_hcd_suspend,
2729 .resume = dummy_hcd_resume,
2730 .driver = {
2731 .name = (char *) driver_name,
2732 },
2733 };
2734
2735 /*-------------------------------------------------------------------------*/
2736 #define MAX_NUM_UDC 2
2737 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2738 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2739
2740 static int __init init(void)
2741 {
2742 int retval = -ENOMEM;
2743 int i;
2744 struct dummy *dum[MAX_NUM_UDC];
2745
2746 if (usb_disabled())
2747 return -ENODEV;
2748
2749 if (!mod_data.is_high_speed && mod_data.is_super_speed)
2750 return -EINVAL;
2751
2752 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2753 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2754 MAX_NUM_UDC);
2755 return -EINVAL;
2756 }
2757
2758 for (i = 0; i < mod_data.num; i++) {
2759 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2760 if (!the_hcd_pdev[i]) {
2761 i--;
2762 while (i >= 0)
2763 platform_device_put(the_hcd_pdev[i--]);
2764 return retval;
2765 }
2766 }
2767 for (i = 0; i < mod_data.num; i++) {
2768 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2769 if (!the_udc_pdev[i]) {
2770 i--;
2771 while (i >= 0)
2772 platform_device_put(the_udc_pdev[i--]);
2773 goto err_alloc_udc;
2774 }
2775 }
2776 for (i = 0; i < mod_data.num; i++) {
2777 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2778 if (!dum[i]) {
2779 retval = -ENOMEM;
2780 goto err_add_pdata;
2781 }
2782 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2783 sizeof(void *));
2784 if (retval)
2785 goto err_add_pdata;
2786 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2787 sizeof(void *));
2788 if (retval)
2789 goto err_add_pdata;
2790 }
2791
2792 retval = platform_driver_register(&dummy_hcd_driver);
2793 if (retval < 0)
2794 goto err_add_pdata;
2795 retval = platform_driver_register(&dummy_udc_driver);
2796 if (retval < 0)
2797 goto err_register_udc_driver;
2798
2799 for (i = 0; i < mod_data.num; i++) {
2800 retval = platform_device_add(the_hcd_pdev[i]);
2801 if (retval < 0) {
2802 i--;
2803 while (i >= 0)
2804 platform_device_del(the_hcd_pdev[i--]);
2805 goto err_add_hcd;
2806 }
2807 }
2808 for (i = 0; i < mod_data.num; i++) {
2809 if (!dum[i]->hs_hcd ||
2810 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2811 /*
2812 * The hcd was added successfully but its probe
2813 * function failed for some reason.
2814 */
2815 retval = -EINVAL;
2816 goto err_add_udc;
2817 }
2818 }
2819
2820 for (i = 0; i < mod_data.num; i++) {
2821 retval = platform_device_add(the_udc_pdev[i]);
2822 if (retval < 0) {
2823 i--;
2824 while (i >= 0)
2825 platform_device_del(the_udc_pdev[i]);
2826 goto err_add_udc;
2827 }
2828 }
2829
2830 for (i = 0; i < mod_data.num; i++) {
2831 if (!platform_get_drvdata(the_udc_pdev[i])) {
2832 /*
2833 * The udc was added successfully but its probe
2834 * function failed for some reason.
2835 */
2836 retval = -EINVAL;
2837 goto err_probe_udc;
2838 }
2839 }
2840 return retval;
2841
2842 err_probe_udc:
2843 for (i = 0; i < mod_data.num; i++)
2844 platform_device_del(the_udc_pdev[i]);
2845 err_add_udc:
2846 for (i = 0; i < mod_data.num; i++)
2847 platform_device_del(the_hcd_pdev[i]);
2848 err_add_hcd:
2849 platform_driver_unregister(&dummy_udc_driver);
2850 err_register_udc_driver:
2851 platform_driver_unregister(&dummy_hcd_driver);
2852 err_add_pdata:
2853 for (i = 0; i < mod_data.num; i++)
2854 kfree(dum[i]);
2855 for (i = 0; i < mod_data.num; i++)
2856 platform_device_put(the_udc_pdev[i]);
2857 err_alloc_udc:
2858 for (i = 0; i < mod_data.num; i++)
2859 platform_device_put(the_hcd_pdev[i]);
2860 return retval;
2861 }
2862 module_init(init);
2863
2864 static void __exit cleanup(void)
2865 {
2866 int i;
2867
2868 for (i = 0; i < mod_data.num; i++) {
2869 struct dummy *dum;
2870
2871 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2872
2873 platform_device_unregister(the_udc_pdev[i]);
2874 platform_device_unregister(the_hcd_pdev[i]);
2875 kfree(dum);
2876 }
2877 platform_driver_unregister(&dummy_udc_driver);
2878 platform_driver_unregister(&dummy_hcd_driver);
2879 }
2880 module_exit(cleanup);
Linux with added FPC-III support