xref: /openbmc/qemu/hw/usb/core.c (revision 1de7afc9)
1 /*
2  * QEMU USB emulation
3  *
4  * Copyright (c) 2005 Fabrice Bellard
5  *
6  * 2008 Generic packet handler rewrite by Max Krasnyansky
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a copy
9  * of this software and associated documentation files (the "Software"), to deal
10  * in the Software without restriction, including without limitation the rights
11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12  * copies of the Software, and to permit persons to whom the Software is
13  * furnished to do so, subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included in
16  * all copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24  * THE SOFTWARE.
25  */
26 #include "qemu-common.h"
27 #include "hw/usb.h"
28 #include "qemu/iov.h"
29 #include "trace.h"
30 
31 void usb_attach(USBPort *port)
32 {
33     USBDevice *dev = port->dev;
34 
35     assert(dev != NULL);
36     assert(dev->attached);
37     assert(dev->state == USB_STATE_NOTATTACHED);
38     port->ops->attach(port);
39     dev->state = USB_STATE_ATTACHED;
40     usb_device_handle_attach(dev);
41 }
42 
43 void usb_detach(USBPort *port)
44 {
45     USBDevice *dev = port->dev;
46 
47     assert(dev != NULL);
48     assert(dev->state != USB_STATE_NOTATTACHED);
49     port->ops->detach(port);
50     dev->state = USB_STATE_NOTATTACHED;
51 }
52 
53 void usb_port_reset(USBPort *port)
54 {
55     USBDevice *dev = port->dev;
56 
57     assert(dev != NULL);
58     usb_detach(port);
59     usb_attach(port);
60     usb_device_reset(dev);
61 }
62 
63 void usb_device_reset(USBDevice *dev)
64 {
65     if (dev == NULL || !dev->attached) {
66         return;
67     }
68     dev->remote_wakeup = 0;
69     dev->addr = 0;
70     dev->state = USB_STATE_DEFAULT;
71     usb_device_handle_reset(dev);
72 }
73 
74 void usb_wakeup(USBEndpoint *ep)
75 {
76     USBDevice *dev = ep->dev;
77     USBBus *bus = usb_bus_from_device(dev);
78 
79     if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
80         dev->port->ops->wakeup(dev->port);
81     }
82     if (bus->ops->wakeup_endpoint) {
83         bus->ops->wakeup_endpoint(bus, ep);
84     }
85 }
86 
87 /**********************/
88 
89 /* generic USB device helpers (you are not forced to use them when
90    writing your USB device driver, but they help handling the
91    protocol)
92 */
93 
94 #define SETUP_STATE_IDLE  0
95 #define SETUP_STATE_SETUP 1
96 #define SETUP_STATE_DATA  2
97 #define SETUP_STATE_ACK   3
98 #define SETUP_STATE_PARAM 4
99 
100 static void do_token_setup(USBDevice *s, USBPacket *p)
101 {
102     int request, value, index;
103 
104     if (p->iov.size != 8) {
105         p->status = USB_RET_STALL;
106         return;
107     }
108 
109     usb_packet_copy(p, s->setup_buf, p->iov.size);
110     p->actual_length = 0;
111     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
112     s->setup_index = 0;
113 
114     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
115     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
116     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
117 
118     if (s->setup_buf[0] & USB_DIR_IN) {
119         usb_device_handle_control(s, p, request, value, index,
120                                   s->setup_len, s->data_buf);
121         if (p->status == USB_RET_ASYNC) {
122             s->setup_state = SETUP_STATE_SETUP;
123         }
124         if (p->status != USB_RET_SUCCESS) {
125             return;
126         }
127 
128         if (p->actual_length < s->setup_len) {
129             s->setup_len = p->actual_length;
130         }
131         s->setup_state = SETUP_STATE_DATA;
132     } else {
133         if (s->setup_len > sizeof(s->data_buf)) {
134             fprintf(stderr,
135                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
136                 s->setup_len, sizeof(s->data_buf));
137             p->status = USB_RET_STALL;
138             return;
139         }
140         if (s->setup_len == 0)
141             s->setup_state = SETUP_STATE_ACK;
142         else
143             s->setup_state = SETUP_STATE_DATA;
144     }
145 
146     p->actual_length = 8;
147 }
148 
149 static void do_token_in(USBDevice *s, USBPacket *p)
150 {
151     int request, value, index;
152 
153     assert(p->ep->nr == 0);
154 
155     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
156     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
157     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
158 
159     switch(s->setup_state) {
160     case SETUP_STATE_ACK:
161         if (!(s->setup_buf[0] & USB_DIR_IN)) {
162             usb_device_handle_control(s, p, request, value, index,
163                                       s->setup_len, s->data_buf);
164             if (p->status == USB_RET_ASYNC) {
165                 return;
166             }
167             s->setup_state = SETUP_STATE_IDLE;
168             p->actual_length = 0;
169         }
170         break;
171 
172     case SETUP_STATE_DATA:
173         if (s->setup_buf[0] & USB_DIR_IN) {
174             int len = s->setup_len - s->setup_index;
175             if (len > p->iov.size) {
176                 len = p->iov.size;
177             }
178             usb_packet_copy(p, s->data_buf + s->setup_index, len);
179             s->setup_index += len;
180             if (s->setup_index >= s->setup_len) {
181                 s->setup_state = SETUP_STATE_ACK;
182             }
183             return;
184         }
185         s->setup_state = SETUP_STATE_IDLE;
186         p->status = USB_RET_STALL;
187         break;
188 
189     default:
190         p->status = USB_RET_STALL;
191     }
192 }
193 
194 static void do_token_out(USBDevice *s, USBPacket *p)
195 {
196     assert(p->ep->nr == 0);
197 
198     switch(s->setup_state) {
199     case SETUP_STATE_ACK:
200         if (s->setup_buf[0] & USB_DIR_IN) {
201             s->setup_state = SETUP_STATE_IDLE;
202             /* transfer OK */
203         } else {
204             /* ignore additional output */
205         }
206         break;
207 
208     case SETUP_STATE_DATA:
209         if (!(s->setup_buf[0] & USB_DIR_IN)) {
210             int len = s->setup_len - s->setup_index;
211             if (len > p->iov.size) {
212                 len = p->iov.size;
213             }
214             usb_packet_copy(p, s->data_buf + s->setup_index, len);
215             s->setup_index += len;
216             if (s->setup_index >= s->setup_len) {
217                 s->setup_state = SETUP_STATE_ACK;
218             }
219             return;
220         }
221         s->setup_state = SETUP_STATE_IDLE;
222         p->status = USB_RET_STALL;
223         break;
224 
225     default:
226         p->status = USB_RET_STALL;
227     }
228 }
229 
230 static void do_parameter(USBDevice *s, USBPacket *p)
231 {
232     int i, request, value, index;
233 
234     for (i = 0; i < 8; i++) {
235         s->setup_buf[i] = p->parameter >> (i*8);
236     }
237 
238     s->setup_state = SETUP_STATE_PARAM;
239     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
240     s->setup_index = 0;
241 
242     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
243     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
244     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
245 
246     if (s->setup_len > sizeof(s->data_buf)) {
247         fprintf(stderr,
248                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
249                 s->setup_len, sizeof(s->data_buf));
250         p->status = USB_RET_STALL;
251         return;
252     }
253 
254     if (p->pid == USB_TOKEN_OUT) {
255         usb_packet_copy(p, s->data_buf, s->setup_len);
256     }
257 
258     usb_device_handle_control(s, p, request, value, index,
259                               s->setup_len, s->data_buf);
260     if (p->status == USB_RET_ASYNC) {
261         return;
262     }
263 
264     if (p->actual_length < s->setup_len) {
265         s->setup_len = p->actual_length;
266     }
267     if (p->pid == USB_TOKEN_IN) {
268         p->actual_length = 0;
269         usb_packet_copy(p, s->data_buf, s->setup_len);
270     }
271 }
272 
273 /* ctrl complete function for devices which use usb_generic_handle_packet and
274    may return USB_RET_ASYNC from their handle_control callback. Device code
275    which does this *must* call this function instead of the normal
276    usb_packet_complete to complete their async control packets. */
277 void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
278 {
279     if (p->status < 0) {
280         s->setup_state = SETUP_STATE_IDLE;
281     }
282 
283     switch (s->setup_state) {
284     case SETUP_STATE_SETUP:
285         if (p->actual_length < s->setup_len) {
286             s->setup_len = p->actual_length;
287         }
288         s->setup_state = SETUP_STATE_DATA;
289         p->actual_length = 8;
290         break;
291 
292     case SETUP_STATE_ACK:
293         s->setup_state = SETUP_STATE_IDLE;
294         p->actual_length = 0;
295         break;
296 
297     case SETUP_STATE_PARAM:
298         if (p->actual_length < s->setup_len) {
299             s->setup_len = p->actual_length;
300         }
301         if (p->pid == USB_TOKEN_IN) {
302             p->actual_length = 0;
303             usb_packet_copy(p, s->data_buf, s->setup_len);
304         }
305         break;
306 
307     default:
308         break;
309     }
310     usb_packet_complete(s, p);
311 }
312 
313 /* XXX: fix overflow */
314 int set_usb_string(uint8_t *buf, const char *str)
315 {
316     int len, i;
317     uint8_t *q;
318 
319     q = buf;
320     len = strlen(str);
321     *q++ = 2 * len + 2;
322     *q++ = 3;
323     for(i = 0; i < len; i++) {
324         *q++ = str[i];
325         *q++ = 0;
326     }
327     return q - buf;
328 }
329 
330 USBDevice *usb_find_device(USBPort *port, uint8_t addr)
331 {
332     USBDevice *dev = port->dev;
333 
334     if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) {
335         return NULL;
336     }
337     if (dev->addr == addr) {
338         return dev;
339     }
340     return usb_device_find_device(dev, addr);
341 }
342 
343 static void usb_process_one(USBPacket *p)
344 {
345     USBDevice *dev = p->ep->dev;
346 
347     /*
348      * Handlers expect status to be initialized to USB_RET_SUCCESS, but it
349      * can be USB_RET_NAK here from a previous usb_process_one() call,
350      * or USB_RET_ASYNC from going through usb_queue_one().
351      */
352     p->status = USB_RET_SUCCESS;
353 
354     if (p->ep->nr == 0) {
355         /* control pipe */
356         if (p->parameter) {
357             do_parameter(dev, p);
358             return;
359         }
360         switch (p->pid) {
361         case USB_TOKEN_SETUP:
362             do_token_setup(dev, p);
363             break;
364         case USB_TOKEN_IN:
365             do_token_in(dev, p);
366             break;
367         case USB_TOKEN_OUT:
368             do_token_out(dev, p);
369             break;
370         default:
371             p->status = USB_RET_STALL;
372         }
373     } else {
374         /* data pipe */
375         usb_device_handle_data(dev, p);
376     }
377 }
378 
379 static void usb_queue_one(USBPacket *p)
380 {
381     usb_packet_set_state(p, USB_PACKET_QUEUED);
382     QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
383     p->status = USB_RET_ASYNC;
384 }
385 
386 /* Hand over a packet to a device for processing.  p->status ==
387    USB_RET_ASYNC indicates the processing isn't finished yet, the
388    driver will call usb_packet_complete() when done processing it. */
389 void usb_handle_packet(USBDevice *dev, USBPacket *p)
390 {
391     if (dev == NULL) {
392         p->status = USB_RET_NODEV;
393         return;
394     }
395     assert(dev == p->ep->dev);
396     assert(dev->state == USB_STATE_DEFAULT);
397     usb_packet_check_state(p, USB_PACKET_SETUP);
398     assert(p->ep != NULL);
399 
400     /* Submitting a new packet clears halt */
401     if (p->ep->halted) {
402         assert(QTAILQ_EMPTY(&p->ep->queue));
403         p->ep->halted = false;
404     }
405 
406     if (QTAILQ_EMPTY(&p->ep->queue) || p->ep->pipeline) {
407         usb_process_one(p);
408         if (p->status == USB_RET_ASYNC) {
409             /* hcd drivers cannot handle async for isoc */
410             assert(p->ep->type != USB_ENDPOINT_XFER_ISOC);
411             /* using async for interrupt packets breaks migration */
412             assert(p->ep->type != USB_ENDPOINT_XFER_INT ||
413                    (dev->flags & USB_DEV_FLAG_IS_HOST));
414             usb_packet_set_state(p, USB_PACKET_ASYNC);
415             QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
416         } else if (p->status == USB_RET_ADD_TO_QUEUE) {
417             usb_queue_one(p);
418         } else {
419             /*
420              * When pipelining is enabled usb-devices must always return async,
421              * otherwise packets can complete out of order!
422              */
423             assert(!p->ep->pipeline || QTAILQ_EMPTY(&p->ep->queue));
424             if (p->status != USB_RET_NAK) {
425                 usb_packet_set_state(p, USB_PACKET_COMPLETE);
426             }
427         }
428     } else {
429         usb_queue_one(p);
430     }
431 }
432 
433 void usb_packet_complete_one(USBDevice *dev, USBPacket *p)
434 {
435     USBEndpoint *ep = p->ep;
436 
437     assert(QTAILQ_FIRST(&ep->queue) == p);
438     assert(p->status != USB_RET_ASYNC && p->status != USB_RET_NAK);
439 
440     if (p->status != USB_RET_SUCCESS ||
441             (p->short_not_ok && (p->actual_length < p->iov.size))) {
442         ep->halted = true;
443     }
444     usb_packet_set_state(p, USB_PACKET_COMPLETE);
445     QTAILQ_REMOVE(&ep->queue, p, queue);
446     dev->port->ops->complete(dev->port, p);
447 }
448 
449 /* Notify the controller that an async packet is complete.  This should only
450    be called for packets previously deferred by returning USB_RET_ASYNC from
451    handle_packet. */
452 void usb_packet_complete(USBDevice *dev, USBPacket *p)
453 {
454     USBEndpoint *ep = p->ep;
455 
456     usb_packet_check_state(p, USB_PACKET_ASYNC);
457     usb_packet_complete_one(dev, p);
458 
459     while (!QTAILQ_EMPTY(&ep->queue)) {
460         p = QTAILQ_FIRST(&ep->queue);
461         if (ep->halted) {
462             /* Empty the queue on a halt */
463             p->status = USB_RET_REMOVE_FROM_QUEUE;
464             dev->port->ops->complete(dev->port, p);
465             continue;
466         }
467         if (p->state == USB_PACKET_ASYNC) {
468             break;
469         }
470         usb_packet_check_state(p, USB_PACKET_QUEUED);
471         usb_process_one(p);
472         if (p->status == USB_RET_ASYNC) {
473             usb_packet_set_state(p, USB_PACKET_ASYNC);
474             break;
475         }
476         usb_packet_complete_one(ep->dev, p);
477     }
478 }
479 
480 /* Cancel an active packet.  The packed must have been deferred by
481    returning USB_RET_ASYNC from handle_packet, and not yet
482    completed.  */
483 void usb_cancel_packet(USBPacket * p)
484 {
485     bool callback = (p->state == USB_PACKET_ASYNC);
486     assert(usb_packet_is_inflight(p));
487     usb_packet_set_state(p, USB_PACKET_CANCELED);
488     QTAILQ_REMOVE(&p->ep->queue, p, queue);
489     if (callback) {
490         usb_device_cancel_packet(p->ep->dev, p);
491     }
492 }
493 
494 
495 void usb_packet_init(USBPacket *p)
496 {
497     qemu_iovec_init(&p->iov, 1);
498 }
499 
500 static const char *usb_packet_state_name(USBPacketState state)
501 {
502     static const char *name[] = {
503         [USB_PACKET_UNDEFINED] = "undef",
504         [USB_PACKET_SETUP]     = "setup",
505         [USB_PACKET_QUEUED]    = "queued",
506         [USB_PACKET_ASYNC]     = "async",
507         [USB_PACKET_COMPLETE]  = "complete",
508         [USB_PACKET_CANCELED]  = "canceled",
509     };
510     if (state < ARRAY_SIZE(name)) {
511         return name[state];
512     }
513     return "INVALID";
514 }
515 
516 void usb_packet_check_state(USBPacket *p, USBPacketState expected)
517 {
518     USBDevice *dev;
519     USBBus *bus;
520 
521     if (p->state == expected) {
522         return;
523     }
524     dev = p->ep->dev;
525     bus = usb_bus_from_device(dev);
526     trace_usb_packet_state_fault(bus->busnr, dev->port->path, p->ep->nr, p,
527                                  usb_packet_state_name(p->state),
528                                  usb_packet_state_name(expected));
529     assert(!"usb packet state check failed");
530 }
531 
532 void usb_packet_set_state(USBPacket *p, USBPacketState state)
533 {
534     if (p->ep) {
535         USBDevice *dev = p->ep->dev;
536         USBBus *bus = usb_bus_from_device(dev);
537         trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr, p,
538                                       usb_packet_state_name(p->state),
539                                       usb_packet_state_name(state));
540     } else {
541         trace_usb_packet_state_change(-1, "", -1, p,
542                                       usb_packet_state_name(p->state),
543                                       usb_packet_state_name(state));
544     }
545     p->state = state;
546 }
547 
548 void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep, uint64_t id,
549                       bool short_not_ok, bool int_req)
550 {
551     assert(!usb_packet_is_inflight(p));
552     assert(p->iov.iov != NULL);
553     p->id = id;
554     p->pid = pid;
555     p->ep = ep;
556     p->status = USB_RET_SUCCESS;
557     p->actual_length = 0;
558     p->parameter = 0;
559     p->short_not_ok = short_not_ok;
560     p->int_req = int_req;
561     p->combined = NULL;
562     qemu_iovec_reset(&p->iov);
563     usb_packet_set_state(p, USB_PACKET_SETUP);
564 }
565 
566 void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len)
567 {
568     qemu_iovec_add(&p->iov, ptr, len);
569 }
570 
571 void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
572 {
573     assert(p->actual_length >= 0);
574     assert(p->actual_length + bytes <= p->iov.size);
575     switch (p->pid) {
576     case USB_TOKEN_SETUP:
577     case USB_TOKEN_OUT:
578         iov_to_buf(p->iov.iov, p->iov.niov, p->actual_length, ptr, bytes);
579         break;
580     case USB_TOKEN_IN:
581         iov_from_buf(p->iov.iov, p->iov.niov, p->actual_length, ptr, bytes);
582         break;
583     default:
584         fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
585         abort();
586     }
587     p->actual_length += bytes;
588 }
589 
590 void usb_packet_skip(USBPacket *p, size_t bytes)
591 {
592     assert(p->actual_length >= 0);
593     assert(p->actual_length + bytes <= p->iov.size);
594     if (p->pid == USB_TOKEN_IN) {
595         iov_memset(p->iov.iov, p->iov.niov, p->actual_length, 0, bytes);
596     }
597     p->actual_length += bytes;
598 }
599 
600 void usb_packet_cleanup(USBPacket *p)
601 {
602     assert(!usb_packet_is_inflight(p));
603     qemu_iovec_destroy(&p->iov);
604 }
605 
606 void usb_ep_reset(USBDevice *dev)
607 {
608     int ep;
609 
610     dev->ep_ctl.nr = 0;
611     dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL;
612     dev->ep_ctl.ifnum = 0;
613     dev->ep_ctl.dev = dev;
614     dev->ep_ctl.pipeline = false;
615     for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
616         dev->ep_in[ep].nr = ep + 1;
617         dev->ep_out[ep].nr = ep + 1;
618         dev->ep_in[ep].pid = USB_TOKEN_IN;
619         dev->ep_out[ep].pid = USB_TOKEN_OUT;
620         dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID;
621         dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID;
622         dev->ep_in[ep].ifnum = USB_INTERFACE_INVALID;
623         dev->ep_out[ep].ifnum = USB_INTERFACE_INVALID;
624         dev->ep_in[ep].dev = dev;
625         dev->ep_out[ep].dev = dev;
626         dev->ep_in[ep].pipeline = false;
627         dev->ep_out[ep].pipeline = false;
628     }
629 }
630 
631 void usb_ep_init(USBDevice *dev)
632 {
633     int ep;
634 
635     usb_ep_reset(dev);
636     QTAILQ_INIT(&dev->ep_ctl.queue);
637     for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
638         QTAILQ_INIT(&dev->ep_in[ep].queue);
639         QTAILQ_INIT(&dev->ep_out[ep].queue);
640     }
641 }
642 
643 void usb_ep_dump(USBDevice *dev)
644 {
645     static const char *tname[] = {
646         [USB_ENDPOINT_XFER_CONTROL] = "control",
647         [USB_ENDPOINT_XFER_ISOC]    = "isoc",
648         [USB_ENDPOINT_XFER_BULK]    = "bulk",
649         [USB_ENDPOINT_XFER_INT]     = "int",
650     };
651     int ifnum, ep, first;
652 
653     fprintf(stderr, "Device \"%s\", config %d\n",
654             dev->product_desc, dev->configuration);
655     for (ifnum = 0; ifnum < 16; ifnum++) {
656         first = 1;
657         for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
658             if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID &&
659                 dev->ep_in[ep].ifnum == ifnum) {
660                 if (first) {
661                     first = 0;
662                     fprintf(stderr, "  Interface %d, alternative %d\n",
663                             ifnum, dev->altsetting[ifnum]);
664                 }
665                 fprintf(stderr, "    Endpoint %d, IN, %s, %d max\n", ep,
666                         tname[dev->ep_in[ep].type],
667                         dev->ep_in[ep].max_packet_size);
668             }
669             if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID &&
670                 dev->ep_out[ep].ifnum == ifnum) {
671                 if (first) {
672                     first = 0;
673                     fprintf(stderr, "  Interface %d, alternative %d\n",
674                             ifnum, dev->altsetting[ifnum]);
675                 }
676                 fprintf(stderr, "    Endpoint %d, OUT, %s, %d max\n", ep,
677                         tname[dev->ep_out[ep].type],
678                         dev->ep_out[ep].max_packet_size);
679             }
680         }
681     }
682     fprintf(stderr, "--\n");
683 }
684 
685 struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep)
686 {
687     struct USBEndpoint *eps;
688 
689     if (dev == NULL) {
690         return NULL;
691     }
692     eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out;
693     if (ep == 0) {
694         return &dev->ep_ctl;
695     }
696     assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT);
697     assert(ep > 0 && ep <= USB_MAX_ENDPOINTS);
698     return eps + ep - 1;
699 }
700 
701 uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep)
702 {
703     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
704     return uep->type;
705 }
706 
707 void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type)
708 {
709     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
710     uep->type = type;
711 }
712 
713 uint8_t usb_ep_get_ifnum(USBDevice *dev, int pid, int ep)
714 {
715     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
716     return uep->ifnum;
717 }
718 
719 void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum)
720 {
721     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
722     uep->ifnum = ifnum;
723 }
724 
725 void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep,
726                                 uint16_t raw)
727 {
728     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
729     int size, microframes;
730 
731     size = raw & 0x7ff;
732     switch ((raw >> 11) & 3) {
733     case 1:
734         microframes = 2;
735         break;
736     case 2:
737         microframes = 3;
738         break;
739     default:
740         microframes = 1;
741         break;
742     }
743     uep->max_packet_size = size * microframes;
744 }
745 
746 int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep)
747 {
748     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
749     return uep->max_packet_size;
750 }
751 
752 void usb_ep_set_pipeline(USBDevice *dev, int pid, int ep, bool enabled)
753 {
754     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
755     uep->pipeline = enabled;
756 }
757 
758 USBPacket *usb_ep_find_packet_by_id(USBDevice *dev, int pid, int ep,
759                                     uint64_t id)
760 {
761     struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
762     USBPacket *p;
763 
764     while ((p = QTAILQ_FIRST(&uep->queue)) != NULL) {
765         if (p->id == id) {
766             return p;
767         }
768     }
769 
770     return NULL;
771 }
772