3 * Copyright (c) 2008-2009 Hans Petter Selasky. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/queue.h>
35 #include "libusb20_desc.h"
36 #include "libusb20_int.h"
41 return (LIBUSB20_ERROR_NOT_SUPPORTED);
51 dummy_callback(struct libusb20_transfer *xfer)
54 switch (libusb20_tr_get_status(xfer)) {
55 case LIBUSB20_TRANSFER_START:
56 libusb20_tr_submit(xfer);
59 /* complete or error */
65 #define dummy_get_config_desc_full (void *)dummy_int
66 #define dummy_get_config_index (void *)dummy_int
67 #define dummy_set_config_index (void *)dummy_int
68 #define dummy_set_alt_index (void *)dummy_int
69 #define dummy_reset_device (void *)dummy_int
70 #define dummy_set_power_mode (void *)dummy_int
71 #define dummy_get_power_mode (void *)dummy_int
72 #define dummy_kernel_driver_active (void *)dummy_int
73 #define dummy_detach_kernel_driver (void *)dummy_int
74 #define dummy_do_request_sync (void *)dummy_int
75 #define dummy_tr_open (void *)dummy_int
76 #define dummy_tr_close (void *)dummy_int
77 #define dummy_tr_clear_stall_sync (void *)dummy_int
78 #define dummy_process (void *)dummy_int
79 #define dummy_dev_info (void *)dummy_int
80 #define dummy_dev_get_iface_driver (void *)dummy_int
82 #define dummy_tr_submit (void *)dummy_void
83 #define dummy_tr_cancel_async (void *)dummy_void
85 static const struct libusb20_device_methods libusb20_dummy_methods = {
86 LIBUSB20_DEVICE(LIBUSB20_DECLARE, dummy)
90 libusb20_tr_callback_wrapper(struct libusb20_transfer *xfer)
96 if (!xfer->is_pending) {
97 xfer->status = LIBUSB20_TRANSFER_START;
102 xfer->callback(xfer);
104 if (xfer->is_restart) {
105 xfer->is_restart = 0;
108 if (xfer->is_draining &&
109 (!xfer->is_pending)) {
110 xfer->is_draining = 0;
111 xfer->status = LIBUSB20_TRANSFER_DRAINED;
112 xfer->callback(xfer);
118 libusb20_tr_close(struct libusb20_transfer *xfer)
122 if (!xfer->is_opened) {
123 return (LIBUSB20_ERROR_OTHER);
125 error = xfer->pdev->methods->tr_close(xfer);
130 if (xfer->ppBuffer) {
131 free(xfer->ppBuffer);
133 /* clear some fields */
136 xfer->maxTotalLength = 0;
137 xfer->maxPacketLen = 0;
142 libusb20_tr_open(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
143 uint32_t MaxFrameCount, uint8_t ep_no)
148 if (xfer->is_opened) {
149 return (LIBUSB20_ERROR_BUSY);
151 if (MaxFrameCount == 0) {
152 return (LIBUSB20_ERROR_INVALID_PARAM);
154 xfer->maxFrames = MaxFrameCount;
156 size = MaxFrameCount * sizeof(xfer->pLength[0]);
157 xfer->pLength = malloc(size);
158 if (xfer->pLength == NULL) {
159 return (LIBUSB20_ERROR_NO_MEM);
161 memset(xfer->pLength, 0, size);
163 size = MaxFrameCount * sizeof(xfer->ppBuffer[0]);
164 xfer->ppBuffer = malloc(size);
165 if (xfer->ppBuffer == NULL) {
167 return (LIBUSB20_ERROR_NO_MEM);
169 memset(xfer->ppBuffer, 0, size);
171 error = xfer->pdev->methods->tr_open(xfer, MaxBufSize,
172 MaxFrameCount, ep_no);
175 free(xfer->ppBuffer);
183 struct libusb20_transfer *
184 libusb20_tr_get_pointer(struct libusb20_device *pdev, uint16_t trIndex)
186 if (trIndex >= pdev->nTransfer) {
189 return (pdev->pTransfer + trIndex);
193 libusb20_tr_get_actual_frames(struct libusb20_transfer *xfer)
195 return (xfer->aFrames);
199 libusb20_tr_get_time_complete(struct libusb20_transfer *xfer)
201 return (xfer->timeComplete);
205 libusb20_tr_get_actual_length(struct libusb20_transfer *xfer)
210 for (x = 0; x != xfer->aFrames; x++) {
211 actlen += xfer->pLength[x];
217 libusb20_tr_get_max_frames(struct libusb20_transfer *xfer)
219 return (xfer->maxFrames);
223 libusb20_tr_get_max_packet_length(struct libusb20_transfer *xfer)
226 * Special Case NOTE: If the packet multiplier is non-zero for
227 * High Speed USB, the value returned is equal to
228 * "wMaxPacketSize * multiplier" !
230 return (xfer->maxPacketLen);
234 libusb20_tr_get_max_total_length(struct libusb20_transfer *xfer)
236 return (xfer->maxTotalLength);
240 libusb20_tr_get_status(struct libusb20_transfer *xfer)
242 return (xfer->status);
246 libusb20_tr_pending(struct libusb20_transfer *xfer)
248 return (xfer->is_pending);
252 libusb20_tr_get_priv_sc0(struct libusb20_transfer *xfer)
254 return (xfer->priv_sc0);
258 libusb20_tr_get_priv_sc1(struct libusb20_transfer *xfer)
260 return (xfer->priv_sc1);
264 libusb20_tr_stop(struct libusb20_transfer *xfer)
266 if (!xfer->is_opened) {
267 /* transfer is not opened */
270 if (!xfer->is_pending) {
271 /* transfer not pending */
274 if (xfer->is_cancel) {
275 /* already cancelling */
278 xfer->is_cancel = 1; /* we are cancelling */
280 xfer->pdev->methods->tr_cancel_async(xfer);
285 libusb20_tr_drain(struct libusb20_transfer *xfer)
287 if (!xfer->is_opened) {
288 /* transfer is not opened */
291 /* make sure that we are cancelling */
292 libusb20_tr_stop(xfer);
294 if (xfer->is_pending) {
295 xfer->is_draining = 1;
301 libusb20_tr_clear_stall_sync(struct libusb20_transfer *xfer)
303 xfer->pdev->methods->tr_clear_stall_sync(xfer);
308 libusb20_tr_set_buffer(struct libusb20_transfer *xfer, void *buffer, uint16_t frIndex)
310 xfer->ppBuffer[frIndex] = buffer;
315 libusb20_tr_set_callback(struct libusb20_transfer *xfer, libusb20_tr_callback_t *cb)
322 libusb20_tr_set_flags(struct libusb20_transfer *xfer, uint8_t flags)
329 libusb20_tr_get_length(struct libusb20_transfer *xfer, uint16_t frIndex)
331 return (xfer->pLength[frIndex]);
335 libusb20_tr_set_length(struct libusb20_transfer *xfer, uint32_t length, uint16_t frIndex)
337 xfer->pLength[frIndex] = length;
342 libusb20_tr_set_priv_sc0(struct libusb20_transfer *xfer, void *sc0)
344 xfer->priv_sc0 = sc0;
349 libusb20_tr_set_priv_sc1(struct libusb20_transfer *xfer, void *sc1)
351 xfer->priv_sc1 = sc1;
356 libusb20_tr_set_timeout(struct libusb20_transfer *xfer, uint32_t timeout)
358 xfer->timeout = timeout;
363 libusb20_tr_set_total_frames(struct libusb20_transfer *xfer, uint32_t nFrames)
365 if (nFrames > xfer->maxFrames) {
366 /* should not happen */
367 nFrames = xfer->maxFrames;
369 xfer->nFrames = nFrames;
374 libusb20_tr_setup_bulk(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
376 xfer->ppBuffer[0] = pBuf;
377 xfer->pLength[0] = length;
378 xfer->timeout = timeout;
384 libusb20_tr_setup_control(struct libusb20_transfer *xfer, void *psetup, void *pBuf, uint32_t timeout)
388 xfer->ppBuffer[0] = psetup;
389 xfer->pLength[0] = 8; /* fixed */
390 xfer->timeout = timeout;
392 len = ((uint8_t *)psetup)[6] | (((uint8_t *)psetup)[7] << 8);
396 xfer->ppBuffer[1] = pBuf;
397 xfer->pLength[1] = len;
405 libusb20_tr_setup_intr(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
407 xfer->ppBuffer[0] = pBuf;
408 xfer->pLength[0] = length;
409 xfer->timeout = timeout;
415 libusb20_tr_setup_isoc(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint16_t frIndex)
417 if (frIndex >= xfer->maxFrames) {
418 /* should not happen */
421 xfer->ppBuffer[frIndex] = pBuf;
422 xfer->pLength[frIndex] = length;
427 libusb20_tr_bulk_intr_sync(struct libusb20_transfer *xfer,
428 void *pbuf, uint32_t length, uint32_t *pactlen,
431 struct libusb20_device *pdev = xfer->pdev;
432 uint32_t transfer_max;
433 uint32_t transfer_act;
436 /* set some sensible default value */
440 /* check for error condition */
441 if (libusb20_tr_pending(xfer))
442 return (LIBUSB20_ERROR_OTHER);
445 /* compute maximum transfer length */
447 libusb20_tr_get_max_total_length(xfer);
449 if (transfer_max > length)
450 transfer_max = length;
452 /* setup bulk or interrupt transfer */
453 libusb20_tr_setup_bulk(xfer, pbuf,
454 transfer_max, timeout);
456 /* start the transfer */
457 libusb20_tr_start(xfer);
459 /* wait for transfer completion */
460 while (libusb20_dev_process(pdev) == 0) {
462 if (libusb20_tr_pending(xfer) == 0)
465 libusb20_dev_wait_process(pdev, -1);
468 transfer_act = libusb20_tr_get_actual_length(xfer);
470 /* update actual length, if any */
472 pactlen[0] += transfer_act;
474 /* check transfer status */
475 retval = libusb20_tr_get_status(xfer);
479 /* check for short transfer */
480 if (transfer_act != transfer_max)
483 /* update buffer pointer and length */
484 pbuf = ((uint8_t *)pbuf) + transfer_max;
485 length = length - transfer_max;
487 } while (length != 0);
493 libusb20_tr_submit(struct libusb20_transfer *xfer)
495 if (!xfer->is_opened) {
496 /* transfer is not opened */
499 if (xfer->is_pending) {
500 /* should not happen */
503 xfer->is_pending = 1; /* we are pending */
504 xfer->is_cancel = 0; /* not cancelling */
505 xfer->is_restart = 0; /* not restarting */
507 xfer->pdev->methods->tr_submit(xfer);
512 libusb20_tr_start(struct libusb20_transfer *xfer)
514 if (!xfer->is_opened) {
515 /* transfer is not opened */
518 if (xfer->is_pending) {
519 if (xfer->is_cancel) {
520 /* cancelling - restart */
521 xfer->is_restart = 1;
523 /* transfer not pending */
526 /* get into the callback */
527 libusb20_tr_callback_wrapper(xfer);
531 /* USB device operations */
534 libusb20_dev_close(struct libusb20_device *pdev)
536 struct libusb20_transfer *xfer;
540 if (!pdev->is_opened) {
541 return (LIBUSB20_ERROR_OTHER);
543 for (x = 0; x != pdev->nTransfer; x++) {
544 xfer = pdev->pTransfer + x;
546 if (!xfer->is_opened) {
547 /* transfer is not opened */
551 libusb20_tr_drain(xfer);
553 libusb20_tr_close(xfer);
556 if (pdev->pTransfer != NULL) {
557 free(pdev->pTransfer);
558 pdev->pTransfer = NULL;
560 error = pdev->beMethods->close_device(pdev);
562 pdev->methods = &libusb20_dummy_methods;
567 * The following variable is only used by the libusb v0.1
570 pdev->claimed_interface = 0;
576 libusb20_dev_detach_kernel_driver(struct libusb20_device *pdev, uint8_t ifaceIndex)
580 error = pdev->methods->detach_kernel_driver(pdev, ifaceIndex);
584 struct LIBUSB20_DEVICE_DESC_DECODED *
585 libusb20_dev_get_device_desc(struct libusb20_device *pdev)
587 return (&(pdev->ddesc));
591 libusb20_dev_get_fd(struct libusb20_device *pdev)
597 libusb20_dev_kernel_driver_active(struct libusb20_device *pdev, uint8_t ifaceIndex)
601 error = pdev->methods->kernel_driver_active(pdev, ifaceIndex);
606 libusb20_dev_open(struct libusb20_device *pdev, uint16_t nTransferMax)
608 struct libusb20_transfer *xfer;
613 if (pdev->is_opened) {
614 return (LIBUSB20_ERROR_BUSY);
616 if (nTransferMax >= 256) {
617 return (LIBUSB20_ERROR_INVALID_PARAM);
618 } else if (nTransferMax != 0) {
619 size = sizeof(pdev->pTransfer[0]) * nTransferMax;
620 pdev->pTransfer = malloc(size);
621 if (pdev->pTransfer == NULL) {
622 return (LIBUSB20_ERROR_NO_MEM);
624 memset(pdev->pTransfer, 0, size);
626 /* initialise all transfers */
627 for (x = 0; x != nTransferMax; x++) {
629 xfer = pdev->pTransfer + x;
633 xfer->callback = &dummy_callback;
636 /* set "nTransfer" early */
637 pdev->nTransfer = nTransferMax;
639 error = pdev->beMethods->open_device(pdev, nTransferMax);
642 if (pdev->pTransfer != NULL) {
643 free(pdev->pTransfer);
644 pdev->pTransfer = NULL;
647 pdev->file_ctrl = -1;
656 libusb20_dev_reset(struct libusb20_device *pdev)
660 error = pdev->methods->reset_device(pdev);
665 libusb20_dev_set_power_mode(struct libusb20_device *pdev, uint8_t power_mode)
669 error = pdev->methods->set_power_mode(pdev, power_mode);
674 libusb20_dev_get_power_mode(struct libusb20_device *pdev)
679 error = pdev->methods->get_power_mode(pdev, &power_mode);
681 power_mode = LIBUSB20_POWER_ON; /* fake power mode */
686 libusb20_dev_set_alt_index(struct libusb20_device *pdev, uint8_t ifaceIndex, uint8_t altIndex)
690 error = pdev->methods->set_alt_index(pdev, ifaceIndex, altIndex);
695 libusb20_dev_set_config_index(struct libusb20_device *pdev, uint8_t configIndex)
699 error = pdev->methods->set_config_index(pdev, configIndex);
704 libusb20_dev_request_sync(struct libusb20_device *pdev,
705 struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data,
706 uint16_t *pactlen, uint32_t timeout, uint8_t flags)
710 error = pdev->methods->do_request_sync(pdev,
711 setup, data, pactlen, timeout, flags);
716 libusb20_dev_req_string_sync(struct libusb20_device *pdev,
717 uint8_t str_index, uint16_t langid, void *ptr, uint16_t len)
719 struct LIBUSB20_CONTROL_SETUP_DECODED req;
722 /* make sure memory is initialised */
727 return (LIBUSB20_ERROR_INVALID_PARAM);
729 LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
732 * We need to read the USB string in two steps else some USB
733 * devices will complain.
736 LIBUSB20_REQUEST_TYPE_STANDARD |
737 LIBUSB20_RECIPIENT_DEVICE |
738 LIBUSB20_ENDPOINT_IN;
739 req.bRequest = LIBUSB20_REQUEST_GET_DESCRIPTOR;
740 req.wValue = (LIBUSB20_DT_STRING << 8) | str_index;
742 req.wLength = 4; /* bytes */
744 error = libusb20_dev_request_sync(pdev, &req,
745 ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
749 req.wLength = *(uint8_t *)ptr; /* bytes */
750 if (req.wLength > len) {
751 /* partial string read */
754 error = libusb20_dev_request_sync(pdev, &req,
755 ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
760 if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) {
761 return (LIBUSB20_ERROR_OTHER);
763 return (0); /* success */
767 libusb20_dev_req_string_simple_sync(struct libusb20_device *pdev,
768 uint8_t str_index, void *ptr, uint16_t len)
779 /* the following code derives from the FreeBSD USB kernel */
781 if ((len < 1) || (ptr == NULL)) {
782 /* too short buffer */
783 return (LIBUSB20_ERROR_INVALID_PARAM);
785 error = libusb20_dev_req_string_sync(pdev,
786 0, 0, temp, sizeof(temp));
788 *(uint8_t *)ptr = 0; /* zero terminate */
791 langid = temp[2] | (temp[3] << 8);
793 error = libusb20_dev_req_string_sync(pdev, str_index,
794 langid, temp, sizeof(temp));
796 *(uint8_t *)ptr = 0; /* zero terminate */
800 /* string length is too short */
801 *(uint8_t *)ptr = 0; /* zero terminate */
802 return (LIBUSB20_ERROR_OTHER);
804 /* reserve one byte for terminating zero */
807 /* find maximum length */
808 n = (temp[0] / 2) - 1;
812 /* reset swap state */
815 /* setup output buffer pointer */
818 /* convert and filter */
819 for (i = 0; (i != n); i++) {
820 c = temp[(2 * i) + 2] | (temp[(2 * i) + 3] << 8);
822 /* convert from Unicode, handle buggy strings */
823 if (((c & 0xff00) == 0) && (swap & 1)) {
824 /* Little Endian, default */
827 } else if (((c & 0x00ff) == 0) && (swap & 2)) {
832 /* skip invalid character */
836 * Filter by default - we don't allow greater and less than
837 * signs because they might confuse the dmesg printouts!
839 if ((*buf == '<') || (*buf == '>') || (!isprint(*buf))) {
840 /* skip invalid character */
845 *buf = 0; /* zero terminate string */
850 struct libusb20_config *
851 libusb20_dev_alloc_config(struct libusb20_device *pdev, uint8_t configIndex)
853 struct libusb20_config *retval = NULL;
859 if (!pdev->is_opened) {
860 error = libusb20_dev_open(pdev, 0);
868 error = pdev->methods->get_config_desc_full(pdev,
869 &ptr, &len, configIndex);
874 /* parse new config descriptor */
875 retval = libusb20_parse_config_desc(ptr);
877 /* free config descriptor */
882 error = libusb20_dev_close(pdev);
887 struct libusb20_device *
888 libusb20_dev_alloc(void)
890 struct libusb20_device *pdev;
892 pdev = malloc(sizeof(*pdev));
896 memset(pdev, 0, sizeof(*pdev));
899 pdev->file_ctrl = -1;
900 pdev->methods = &libusb20_dummy_methods;
905 libusb20_dev_get_config_index(struct libusb20_device *pdev)
911 if (!pdev->is_opened) {
912 error = libusb20_dev_open(pdev, 0);
922 error = pdev->methods->get_config_index(pdev, &cfg_index);
924 cfg_index = 0 - 1; /* current config index */
927 if (libusb20_dev_close(pdev)) {
935 libusb20_dev_get_mode(struct libusb20_device *pdev)
937 return (pdev->usb_mode);
941 libusb20_dev_get_speed(struct libusb20_device *pdev)
943 return (pdev->usb_speed);
946 /* if this function returns an error, the device is gone */
948 libusb20_dev_process(struct libusb20_device *pdev)
952 error = pdev->methods->process(pdev);
957 libusb20_dev_wait_process(struct libusb20_device *pdev, int timeout)
959 struct pollfd pfd[1];
961 if (!pdev->is_opened) {
964 pfd[0].fd = pdev->file;
965 pfd[0].events = (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM);
968 if (poll(pfd, 1, timeout)) {
969 /* ignore any error */
975 libusb20_dev_free(struct libusb20_device *pdev)
981 if (pdev->is_opened) {
982 if (libusb20_dev_close(pdev)) {
983 /* ignore any errors */
991 libusb20_dev_get_info(struct libusb20_device *pdev,
992 struct usb_device_info *pinfo)
995 return (LIBUSB20_ERROR_INVALID_PARAM);
997 return (pdev->beMethods->dev_get_info(pdev, pinfo));
1001 libusb20_dev_get_backend_name(struct libusb20_device *pdev)
1003 return (pdev->beMethods->get_backend_name());
1007 libusb20_dev_get_desc(struct libusb20_device *pdev)
1009 return (pdev->usb_desc);
1013 libusb20_dev_set_debug(struct libusb20_device *pdev, int debug)
1015 pdev->debug = debug;
1020 libusb20_dev_get_debug(struct libusb20_device *pdev)
1022 return (pdev->debug);
1026 libusb20_dev_get_address(struct libusb20_device *pdev)
1028 return (pdev->device_address);
1032 libusb20_dev_get_bus_number(struct libusb20_device *pdev)
1034 return (pdev->bus_number);
1038 libusb20_dev_get_iface_desc(struct libusb20_device *pdev,
1039 uint8_t iface_index, char *buf, uint8_t len)
1041 if ((buf == NULL) || (len == 0))
1042 return (LIBUSB20_ERROR_INVALID_PARAM);
1044 return (pdev->beMethods->dev_get_iface_desc(
1045 pdev, iface_index, buf, len));
1048 /* USB backend operations */
1051 libusb20_be_get_dev_quirk(struct libusb20_backend *pbe,
1052 uint16_t quirk_index, struct libusb20_quirk *pq)
1054 return (pbe->methods->root_get_dev_quirk(pbe, quirk_index, pq));
1058 libusb20_be_get_quirk_name(struct libusb20_backend *pbe,
1059 uint16_t quirk_index, struct libusb20_quirk *pq)
1061 return (pbe->methods->root_get_quirk_name(pbe, quirk_index, pq));
1065 libusb20_be_add_dev_quirk(struct libusb20_backend *pbe,
1066 struct libusb20_quirk *pq)
1068 return (pbe->methods->root_add_dev_quirk(pbe, pq));
1072 libusb20_be_remove_dev_quirk(struct libusb20_backend *pbe,
1073 struct libusb20_quirk *pq)
1075 return (pbe->methods->root_remove_dev_quirk(pbe, pq));
1079 libusb20_be_set_template(struct libusb20_backend *pbe, int temp)
1081 return (pbe->methods->root_set_template(pbe, temp));
1085 libusb20_be_get_template(struct libusb20_backend *pbe, int *ptemp)
1092 return (pbe->methods->root_get_template(pbe, ptemp));
1095 struct libusb20_device *
1096 libusb20_be_device_foreach(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1100 } else if (pdev == NULL) {
1101 pdev = TAILQ_FIRST(&(pbe->usb_devs));
1103 pdev = TAILQ_NEXT(pdev, dev_entry);
1108 struct libusb20_backend *
1109 libusb20_be_alloc(const struct libusb20_backend_methods *methods)
1111 struct libusb20_backend *pbe;
1113 pbe = malloc(sizeof(*pbe));
1117 memset(pbe, 0, sizeof(*pbe));
1119 TAILQ_INIT(&(pbe->usb_devs));
1121 pbe->methods = methods; /* set backend methods */
1123 /* do the initial device scan */
1124 if (pbe->methods->init_backend) {
1125 pbe->methods->init_backend(pbe);
1130 struct libusb20_backend *
1131 libusb20_be_alloc_linux(void)
1133 struct libusb20_backend *pbe;
1136 pbe = libusb20_be_alloc(&libusb20_linux_backend);
1143 struct libusb20_backend *
1144 libusb20_be_alloc_ugen20(void)
1146 struct libusb20_backend *pbe;
1149 pbe = libusb20_be_alloc(&libusb20_ugen20_backend);
1156 struct libusb20_backend *
1157 libusb20_be_alloc_default(void)
1159 struct libusb20_backend *pbe;
1161 pbe = libusb20_be_alloc_linux();
1165 pbe = libusb20_be_alloc_ugen20();
1169 return (NULL); /* no backend found */
1173 libusb20_be_free(struct libusb20_backend *pbe)
1175 struct libusb20_device *pdev;
1181 while ((pdev = libusb20_be_device_foreach(pbe, NULL))) {
1182 libusb20_be_dequeue_device(pbe, pdev);
1183 libusb20_dev_free(pdev);
1185 if (pbe->methods->exit_backend) {
1186 pbe->methods->exit_backend(pbe);
1193 libusb20_be_enqueue_device(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1195 pdev->beMethods = pbe->methods; /* copy backend methods */
1196 TAILQ_INSERT_TAIL(&(pbe->usb_devs), pdev, dev_entry);
1200 libusb20_be_dequeue_device(struct libusb20_backend *pbe,
1201 struct libusb20_device *pdev)
1203 TAILQ_REMOVE(&(pbe->usb_devs), pdev, dev_entry);