2 * Windows CE backend for libusb 1.0
3 * Copyright © 2011-2013 RealVNC Ltd.
4 * Large portions taken from Windows backend, which is
5 * Copyright © 2009-2010 Pete Batard <pbatard@gmail.com>
6 * With contributions from Michael Plante, Orin Eman et al.
7 * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
8 * Major code testing contribution by Xiaofan Chen
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include "wince_usb.h"
34 int windows_version = WINDOWS_CE;
35 static uint64_t hires_frequency, hires_ticks_to_ps;
36 static HANDLE driver_handle = INVALID_HANDLE_VALUE;
37 static int concurrent_usage = -1;
40 * Converts a windows error to human readable string
41 * uses retval as errorcode, or, if 0, use GetLastError()
43 #if defined(ENABLE_LOGGING)
44 static const char *windows_error_str(DWORD error_code)
46 static TCHAR wErr_string[ERR_BUFFER_SIZE];
47 static char err_string[ERR_BUFFER_SIZE];
53 error_code = GetLastError();
55 len = sprintf(err_string, "[%u] ", (unsigned int)error_code);
57 size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
58 NULL, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
59 wErr_string, ERR_BUFFER_SIZE, NULL);
61 DWORD format_error = GetLastError();
63 snprintf(err_string, ERR_BUFFER_SIZE,
64 "Windows error code %u (FormatMessage error code %u)",
65 (unsigned int)error_code, (unsigned int)format_error);
67 snprintf(err_string, ERR_BUFFER_SIZE, "Unknown error code %u", (unsigned int)error_code);
69 // Remove CR/LF terminators, if present
70 size_t pos = size - 2;
71 if (wErr_string[pos] == 0x0D)
74 if (!WideCharToMultiByte(CP_ACP, 0, wErr_string, -1, &err_string[len], ERR_BUFFER_SIZE - len, NULL, NULL))
75 strcpy(err_string, "Unable to convert error string");
82 static struct wince_device_priv *_device_priv(struct libusb_device *dev)
84 return (struct wince_device_priv *)dev->os_priv;
87 // ceusbkwrapper to libusb error code mapping
88 static int translate_driver_error(DWORD error)
91 case ERROR_INVALID_PARAMETER:
92 return LIBUSB_ERROR_INVALID_PARAM;
93 case ERROR_CALL_NOT_IMPLEMENTED:
94 case ERROR_NOT_SUPPORTED:
95 return LIBUSB_ERROR_NOT_SUPPORTED;
96 case ERROR_NOT_ENOUGH_MEMORY:
97 return LIBUSB_ERROR_NO_MEM;
98 case ERROR_INVALID_HANDLE:
99 return LIBUSB_ERROR_NO_DEVICE;
101 return LIBUSB_ERROR_BUSY;
103 // Error codes that are either unexpected, or have
104 // no suitable LIBUSB_ERROR equivalent.
105 case ERROR_CANCELLED:
106 case ERROR_INTERNAL_ERROR:
108 return LIBUSB_ERROR_OTHER;
112 static int init_dllimports(void)
114 DLL_GET_HANDLE(ceusbkwrapper);
115 DLL_LOAD_FUNC(ceusbkwrapper, UkwOpenDriver, TRUE);
116 DLL_LOAD_FUNC(ceusbkwrapper, UkwGetDeviceList, TRUE);
117 DLL_LOAD_FUNC(ceusbkwrapper, UkwReleaseDeviceList, TRUE);
118 DLL_LOAD_FUNC(ceusbkwrapper, UkwGetDeviceAddress, TRUE);
119 DLL_LOAD_FUNC(ceusbkwrapper, UkwGetDeviceDescriptor, TRUE);
120 DLL_LOAD_FUNC(ceusbkwrapper, UkwGetConfigDescriptor, TRUE);
121 DLL_LOAD_FUNC(ceusbkwrapper, UkwCloseDriver, TRUE);
122 DLL_LOAD_FUNC(ceusbkwrapper, UkwCancelTransfer, TRUE);
123 DLL_LOAD_FUNC(ceusbkwrapper, UkwIssueControlTransfer, TRUE);
124 DLL_LOAD_FUNC(ceusbkwrapper, UkwClaimInterface, TRUE);
125 DLL_LOAD_FUNC(ceusbkwrapper, UkwReleaseInterface, TRUE);
126 DLL_LOAD_FUNC(ceusbkwrapper, UkwSetInterfaceAlternateSetting, TRUE);
127 DLL_LOAD_FUNC(ceusbkwrapper, UkwClearHaltHost, TRUE);
128 DLL_LOAD_FUNC(ceusbkwrapper, UkwClearHaltDevice, TRUE);
129 DLL_LOAD_FUNC(ceusbkwrapper, UkwGetConfig, TRUE);
130 DLL_LOAD_FUNC(ceusbkwrapper, UkwSetConfig, TRUE);
131 DLL_LOAD_FUNC(ceusbkwrapper, UkwResetDevice, TRUE);
132 DLL_LOAD_FUNC(ceusbkwrapper, UkwKernelDriverActive, TRUE);
133 DLL_LOAD_FUNC(ceusbkwrapper, UkwAttachKernelDriver, TRUE);
134 DLL_LOAD_FUNC(ceusbkwrapper, UkwDetachKernelDriver, TRUE);
135 DLL_LOAD_FUNC(ceusbkwrapper, UkwIssueBulkTransfer, TRUE);
136 DLL_LOAD_FUNC(ceusbkwrapper, UkwIsPipeHalted, TRUE);
138 return LIBUSB_SUCCESS;
141 static void exit_dllimports(void)
143 DLL_FREE_HANDLE(ceusbkwrapper);
146 static int init_device(
147 struct libusb_device *dev, UKW_DEVICE drv_dev,
148 unsigned char bus_addr, unsigned char dev_addr)
150 struct wince_device_priv *priv = _device_priv(dev);
151 int r = LIBUSB_SUCCESS;
153 dev->bus_number = bus_addr;
154 dev->device_address = dev_addr;
157 if (!UkwGetDeviceDescriptor(priv->dev, &(priv->desc)))
158 r = translate_driver_error(GetLastError());
163 // Internal API functions
164 static int wince_init(struct libusb_context *ctx)
166 int r = LIBUSB_ERROR_OTHER;
168 LARGE_INTEGER li_frequency;
169 TCHAR sem_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
171 _stprintf(sem_name, _T("libusb_init%08X"), (unsigned int)(GetCurrentProcessId() & 0xFFFFFFFF));
172 semaphore = CreateSemaphore(NULL, 1, 1, sem_name);
173 if (semaphore == NULL) {
174 usbi_err(ctx, "could not create semaphore: %s", windows_error_str(0));
175 return LIBUSB_ERROR_NO_MEM;
178 // A successful wait brings our semaphore count to 0 (unsignaled)
179 // => any concurent wait stalls until the semaphore's release
180 if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
181 usbi_err(ctx, "failure to access semaphore: %s", windows_error_str(0));
182 CloseHandle(semaphore);
183 return LIBUSB_ERROR_NO_MEM;
186 // NB: concurrent usage supposes that init calls are equally balanced with
187 // exit calls. If init is called more than exit, we will not exit properly
188 if ( ++concurrent_usage == 0 ) { // First init?
189 // Initialize pollable file descriptors
193 if (init_dllimports() != LIBUSB_SUCCESS) {
194 usbi_err(ctx, "could not resolve DLL functions");
195 r = LIBUSB_ERROR_NOT_SUPPORTED;
199 // try to open a handle to the driver
200 driver_handle = UkwOpenDriver();
201 if (driver_handle == INVALID_HANDLE_VALUE) {
202 usbi_err(ctx, "could not connect to driver");
203 r = LIBUSB_ERROR_NOT_SUPPORTED;
207 // find out if we have access to a monotonic (hires) timer
208 if (QueryPerformanceFrequency(&li_frequency)) {
209 hires_frequency = li_frequency.QuadPart;
210 // The hires frequency can go as high as 4 GHz, so we'll use a conversion
211 // to picoseconds to compute the tv_nsecs part in clock_gettime
212 hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
213 usbi_dbg("hires timer available (Frequency: %"PRIu64" Hz)", hires_frequency);
215 usbi_dbg("no hires timer available on this platform");
217 hires_ticks_to_ps = UINT64_C(0);
220 // At this stage, either we went through full init successfully, or didn't need to
223 init_exit: // Holds semaphore here.
224 if (!concurrent_usage && r != LIBUSB_SUCCESS) { // First init failed?
228 if (driver_handle != INVALID_HANDLE_VALUE) {
229 UkwCloseDriver(driver_handle);
230 driver_handle = INVALID_HANDLE_VALUE;
234 if (r != LIBUSB_SUCCESS)
235 --concurrent_usage; // Not expected to call libusb_exit if we failed.
237 ReleaseSemaphore(semaphore, 1, NULL); // increase count back to 1
238 CloseHandle(semaphore);
242 static void wince_exit(void)
245 TCHAR sem_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
247 _stprintf(sem_name, _T("libusb_init%08X"), (unsigned int)(GetCurrentProcessId() & 0xFFFFFFFF));
248 semaphore = CreateSemaphore(NULL, 1, 1, sem_name);
249 if (semaphore == NULL)
252 // A successful wait brings our semaphore count to 0 (unsignaled)
253 // => any concurent wait stalls until the semaphore release
254 if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
255 CloseHandle(semaphore);
259 // Only works if exits and inits are balanced exactly
260 if (--concurrent_usage < 0) { // Last exit
264 if (driver_handle != INVALID_HANDLE_VALUE) {
265 UkwCloseDriver(driver_handle);
266 driver_handle = INVALID_HANDLE_VALUE;
270 ReleaseSemaphore(semaphore, 1, NULL); // increase count back to 1
271 CloseHandle(semaphore);
274 static int wince_get_device_list(
275 struct libusb_context *ctx,
276 struct discovered_devs **discdevs)
278 UKW_DEVICE devices[MAX_DEVICE_COUNT];
279 struct discovered_devs *new_devices = *discdevs;
281 struct libusb_device *dev = NULL;
282 unsigned char bus_addr, dev_addr;
283 unsigned long session_id;
285 DWORD release_list_offset = 0;
286 int r = LIBUSB_SUCCESS;
288 success = UkwGetDeviceList(driver_handle, devices, MAX_DEVICE_COUNT, &count);
290 int libusbErr = translate_driver_error(GetLastError());
291 usbi_err(ctx, "could not get devices: %s", windows_error_str(0));
295 for (i = 0; i < count; ++i) {
296 release_list_offset = i;
297 success = UkwGetDeviceAddress(devices[i], &bus_addr, &dev_addr, &session_id);
299 r = translate_driver_error(GetLastError());
300 usbi_err(ctx, "could not get device address for %u: %s", (unsigned int)i, windows_error_str(0));
304 dev = usbi_get_device_by_session_id(ctx, session_id);
306 usbi_dbg("using existing device for %u/%u (session %lu)",
307 bus_addr, dev_addr, session_id);
308 // Release just this element in the device list (as we already hold a
310 UkwReleaseDeviceList(driver_handle, &devices[i], 1);
311 release_list_offset++;
313 usbi_dbg("allocating new device for %u/%u (session %lu)",
314 bus_addr, dev_addr, session_id);
315 dev = usbi_alloc_device(ctx, session_id);
317 r = LIBUSB_ERROR_NO_MEM;
321 r = init_device(dev, devices[i], bus_addr, dev_addr);
325 r = usbi_sanitize_device(dev);
330 new_devices = discovered_devs_append(new_devices, dev);
332 r = LIBUSB_ERROR_NO_MEM;
336 libusb_unref_device(dev);
339 *discdevs = new_devices;
342 *discdevs = new_devices;
343 libusb_unref_device(dev);
344 // Release the remainder of the unprocessed device list.
345 // The devices added to new_devices already will still be passed up to libusb,
346 // which can dispose of them at its leisure.
347 UkwReleaseDeviceList(driver_handle, &devices[release_list_offset], count - release_list_offset);
351 static int wince_open(struct libusb_device_handle *handle)
353 // Nothing to do to open devices as a handle to it has
354 // been retrieved by wince_get_device_list
355 return LIBUSB_SUCCESS;
358 static void wince_close(struct libusb_device_handle *handle)
360 // Nothing to do as wince_open does nothing.
363 static int wince_get_device_descriptor(
364 struct libusb_device *device,
365 unsigned char *buffer, int *host_endian)
367 struct wince_device_priv *priv = _device_priv(device);
370 memcpy(buffer, &priv->desc, DEVICE_DESC_LENGTH);
371 return LIBUSB_SUCCESS;
374 static int wince_get_active_config_descriptor(
375 struct libusb_device *device,
376 unsigned char *buffer, size_t len, int *host_endian)
378 struct wince_device_priv *priv = _device_priv(device);
379 DWORD actualSize = len;
382 if (!UkwGetConfigDescriptor(priv->dev, UKW_ACTIVE_CONFIGURATION, buffer, len, &actualSize))
383 return translate_driver_error(GetLastError());
388 static int wince_get_config_descriptor(
389 struct libusb_device *device,
390 uint8_t config_index,
391 unsigned char *buffer, size_t len, int *host_endian)
393 struct wince_device_priv *priv = _device_priv(device);
394 DWORD actualSize = len;
397 if (!UkwGetConfigDescriptor(priv->dev, config_index, buffer, len, &actualSize))
398 return translate_driver_error(GetLastError());
403 static int wince_get_configuration(
404 struct libusb_device_handle *handle,
407 struct wince_device_priv *priv = _device_priv(handle->dev);
410 if (!UkwGetConfig(priv->dev, &cv))
411 return translate_driver_error(GetLastError());
414 return LIBUSB_SUCCESS;
417 static int wince_set_configuration(
418 struct libusb_device_handle *handle,
421 struct wince_device_priv *priv = _device_priv(handle->dev);
422 // Setting configuration 0 places the device in Address state.
423 // This should correspond to the "unconfigured state" required by
424 // libusb when the specified configuration is -1.
425 UCHAR cv = (config < 0) ? 0 : config;
426 if (!UkwSetConfig(priv->dev, cv))
427 return translate_driver_error(GetLastError());
429 return LIBUSB_SUCCESS;
432 static int wince_claim_interface(
433 struct libusb_device_handle *handle,
434 int interface_number)
436 struct wince_device_priv *priv = _device_priv(handle->dev);
438 if (!UkwClaimInterface(priv->dev, interface_number))
439 return translate_driver_error(GetLastError());
441 return LIBUSB_SUCCESS;
444 static int wince_release_interface(
445 struct libusb_device_handle *handle,
446 int interface_number)
448 struct wince_device_priv *priv = _device_priv(handle->dev);
450 if (!UkwSetInterfaceAlternateSetting(priv->dev, interface_number, 0))
451 return translate_driver_error(GetLastError());
453 if (!UkwReleaseInterface(priv->dev, interface_number))
454 return translate_driver_error(GetLastError());
456 return LIBUSB_SUCCESS;
459 static int wince_set_interface_altsetting(
460 struct libusb_device_handle *handle,
461 int interface_number, int altsetting)
463 struct wince_device_priv *priv = _device_priv(handle->dev);
465 if (!UkwSetInterfaceAlternateSetting(priv->dev, interface_number, altsetting))
466 return translate_driver_error(GetLastError());
468 return LIBUSB_SUCCESS;
471 static int wince_clear_halt(
472 struct libusb_device_handle *handle,
473 unsigned char endpoint)
475 struct wince_device_priv *priv = _device_priv(handle->dev);
477 if (!UkwClearHaltHost(priv->dev, endpoint))
478 return translate_driver_error(GetLastError());
480 if (!UkwClearHaltDevice(priv->dev, endpoint))
481 return translate_driver_error(GetLastError());
483 return LIBUSB_SUCCESS;
486 static int wince_reset_device(
487 struct libusb_device_handle *handle)
489 struct wince_device_priv *priv = _device_priv(handle->dev);
491 if (!UkwResetDevice(priv->dev))
492 return translate_driver_error(GetLastError());
494 return LIBUSB_SUCCESS;
497 static int wince_kernel_driver_active(
498 struct libusb_device_handle *handle,
499 int interface_number)
501 struct wince_device_priv *priv = _device_priv(handle->dev);
504 if (!UkwKernelDriverActive(priv->dev, interface_number, &result))
505 return translate_driver_error(GetLastError());
507 return result ? 1 : 0;
510 static int wince_detach_kernel_driver(
511 struct libusb_device_handle *handle,
512 int interface_number)
514 struct wince_device_priv *priv = _device_priv(handle->dev);
516 if (!UkwDetachKernelDriver(priv->dev, interface_number))
517 return translate_driver_error(GetLastError());
519 return LIBUSB_SUCCESS;
522 static int wince_attach_kernel_driver(
523 struct libusb_device_handle *handle,
524 int interface_number)
526 struct wince_device_priv *priv = _device_priv(handle->dev);
528 if (!UkwAttachKernelDriver(priv->dev, interface_number))
529 return translate_driver_error(GetLastError());
531 return LIBUSB_SUCCESS;
534 static void wince_destroy_device(struct libusb_device *dev)
536 struct wince_device_priv *priv = _device_priv(dev);
538 UkwReleaseDeviceList(driver_handle, &priv->dev, 1);
541 static void wince_clear_transfer_priv(struct usbi_transfer *itransfer)
543 struct wince_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
544 struct winfd wfd = fd_to_winfd(transfer_priv->pollable_fd.fd);
546 // No need to cancel transfer as it is either complete or abandoned
547 wfd.itransfer = NULL;
548 CloseHandle(wfd.handle);
549 usbi_free_fd(&transfer_priv->pollable_fd);
552 static int wince_cancel_transfer(struct usbi_transfer *itransfer)
554 struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
555 struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
556 struct wince_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
558 if (!UkwCancelTransfer(priv->dev, transfer_priv->pollable_fd.overlapped, UKW_TF_NO_WAIT))
559 return translate_driver_error(GetLastError());
561 return LIBUSB_SUCCESS;
564 static int wince_submit_control_or_bulk_transfer(struct usbi_transfer *itransfer)
566 struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
567 struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
568 struct wince_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
569 struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
570 BOOL direction_in, ret;
574 PUKW_CONTROL_HEADER setup = NULL;
575 const BOOL control_transfer = transfer->type == LIBUSB_TRANSFER_TYPE_CONTROL;
577 transfer_priv->pollable_fd = INVALID_WINFD;
578 if (control_transfer) {
579 setup = (PUKW_CONTROL_HEADER) transfer->buffer;
580 direction_in = setup->bmRequestType & LIBUSB_ENDPOINT_IN;
582 direction_in = transfer->endpoint & LIBUSB_ENDPOINT_IN;
584 flags = direction_in ? UKW_TF_IN_TRANSFER : UKW_TF_OUT_TRANSFER;
585 flags |= UKW_TF_SHORT_TRANSFER_OK;
587 eventHandle = CreateEvent(NULL, FALSE, FALSE, NULL);
588 if (eventHandle == NULL) {
589 usbi_err(ctx, "Failed to create event for async transfer");
590 return LIBUSB_ERROR_NO_MEM;
593 wfd = usbi_create_fd(eventHandle, direction_in ? RW_READ : RW_WRITE, itransfer, &wince_cancel_transfer);
595 CloseHandle(eventHandle);
596 return LIBUSB_ERROR_NO_MEM;
599 transfer_priv->pollable_fd = wfd;
600 if (control_transfer) {
601 // Split out control setup header and data buffer
602 DWORD bufLen = transfer->length - sizeof(UKW_CONTROL_HEADER);
603 PVOID buf = (PVOID) &transfer->buffer[sizeof(UKW_CONTROL_HEADER)];
605 ret = UkwIssueControlTransfer(priv->dev, flags, setup, buf, bufLen, &transfer->actual_length, wfd.overlapped);
607 ret = UkwIssueBulkTransfer(priv->dev, flags, transfer->endpoint, transfer->buffer,
608 transfer->length, &transfer->actual_length, wfd.overlapped);
612 int libusbErr = translate_driver_error(GetLastError());
613 usbi_err(ctx, "UkwIssue%sTransfer failed: error %u",
614 control_transfer ? "Control" : "Bulk", (unsigned int)GetLastError());
615 wince_clear_transfer_priv(itransfer);
618 usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, direction_in ? POLLIN : POLLOUT);
620 return LIBUSB_SUCCESS;
623 static int wince_submit_iso_transfer(struct usbi_transfer *itransfer)
625 return LIBUSB_ERROR_NOT_SUPPORTED;
628 static int wince_submit_transfer(struct usbi_transfer *itransfer)
630 struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
632 switch (transfer->type) {
633 case LIBUSB_TRANSFER_TYPE_CONTROL:
634 case LIBUSB_TRANSFER_TYPE_BULK:
635 case LIBUSB_TRANSFER_TYPE_INTERRUPT:
636 return wince_submit_control_or_bulk_transfer(itransfer);
637 case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
638 return wince_submit_iso_transfer(itransfer);
639 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
640 return LIBUSB_ERROR_NOT_SUPPORTED;
642 usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
643 return LIBUSB_ERROR_INVALID_PARAM;
647 static void wince_transfer_callback(
648 struct usbi_transfer *itransfer,
649 uint32_t io_result, uint32_t io_size)
651 struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
652 struct wince_transfer_priv *transfer_priv = (struct wince_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
653 struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
656 usbi_dbg("handling I/O completion with errcode %u", io_result);
658 if (io_result == ERROR_NOT_SUPPORTED &&
659 transfer->type != LIBUSB_TRANSFER_TYPE_CONTROL) {
660 /* For functional stalls, the WinCE USB layer (and therefore the USB Kernel Wrapper
661 * Driver) will report USB_ERROR_STALL/ERROR_NOT_SUPPORTED in situations where the
662 * endpoint isn't actually stalled.
664 * One example of this is that some devices will occasionally fail to reply to an IN
665 * token. The WinCE USB layer carries on with the transaction until it is completed
666 * (or cancelled) but then completes it with USB_ERROR_STALL.
668 * This code therefore needs to confirm that there really is a stall error, by both
669 * checking the pipe status and requesting the endpoint status from the device.
672 usbi_dbg("checking I/O completion with errcode ERROR_NOT_SUPPORTED is really a stall");
673 if (UkwIsPipeHalted(priv->dev, transfer->endpoint, &halted)) {
674 /* Pipe status retrieved, so now request endpoint status by sending a GET_STATUS
675 * control request to the device. This is done synchronously, which is a bit
676 * naughty, but this is a special corner case.
680 UKW_CONTROL_HEADER ctrlHeader;
681 ctrlHeader.bmRequestType = LIBUSB_REQUEST_TYPE_STANDARD |
682 LIBUSB_ENDPOINT_IN | LIBUSB_RECIPIENT_ENDPOINT;
683 ctrlHeader.bRequest = LIBUSB_REQUEST_GET_STATUS;
684 ctrlHeader.wValue = 0;
685 ctrlHeader.wIndex = transfer->endpoint;
686 ctrlHeader.wLength = sizeof(wStatus);
687 if (UkwIssueControlTransfer(priv->dev,
688 UKW_TF_IN_TRANSFER | UKW_TF_SEND_TO_ENDPOINT,
689 &ctrlHeader, &wStatus, sizeof(wStatus), &written, NULL)) {
690 if (written == sizeof(wStatus) &&
691 (wStatus & STATUS_HALT_FLAG) == 0) {
692 if (!halted || UkwClearHaltHost(priv->dev, transfer->endpoint)) {
693 usbi_dbg("Endpoint doesn't appear to be stalled, overriding error with success");
694 io_result = ERROR_SUCCESS;
696 usbi_dbg("Endpoint doesn't appear to be stalled, but the host is halted, changing error");
697 io_result = ERROR_IO_DEVICE;
706 itransfer->transferred += io_size;
707 status = LIBUSB_TRANSFER_COMPLETED;
709 case ERROR_CANCELLED:
710 usbi_dbg("detected transfer cancel");
711 status = LIBUSB_TRANSFER_CANCELLED;
713 case ERROR_NOT_SUPPORTED:
714 case ERROR_GEN_FAILURE:
715 usbi_dbg("detected endpoint stall");
716 status = LIBUSB_TRANSFER_STALL;
718 case ERROR_SEM_TIMEOUT:
719 usbi_dbg("detected semaphore timeout");
720 status = LIBUSB_TRANSFER_TIMED_OUT;
722 case ERROR_OPERATION_ABORTED:
723 usbi_dbg("detected operation aborted");
724 status = LIBUSB_TRANSFER_CANCELLED;
727 usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error: %s", windows_error_str(io_result));
728 status = LIBUSB_TRANSFER_ERROR;
732 wince_clear_transfer_priv(itransfer);
733 if (status == LIBUSB_TRANSFER_CANCELLED)
734 usbi_handle_transfer_cancellation(itransfer);
736 usbi_handle_transfer_completion(itransfer, (enum libusb_transfer_status)status);
739 static void wince_handle_callback(
740 struct usbi_transfer *itransfer,
741 uint32_t io_result, uint32_t io_size)
743 struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
745 switch (transfer->type) {
746 case LIBUSB_TRANSFER_TYPE_CONTROL:
747 case LIBUSB_TRANSFER_TYPE_BULK:
748 case LIBUSB_TRANSFER_TYPE_INTERRUPT:
749 case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
750 wince_transfer_callback (itransfer, io_result, io_size);
752 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
755 usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
759 static int wince_handle_events(
760 struct libusb_context *ctx,
761 struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
763 struct wince_transfer_priv* transfer_priv = NULL;
764 POLL_NFDS_TYPE i = 0;
766 struct usbi_transfer *transfer;
767 DWORD io_size, io_result;
768 int r = LIBUSB_SUCCESS;
770 usbi_mutex_lock(&ctx->open_devs_lock);
771 for (i = 0; i < nfds && num_ready > 0; i++) {
773 usbi_dbg("checking fd %d with revents = %04x", fds[i].fd, fds[i].revents);
780 // Because a Windows OVERLAPPED is used for poll emulation,
781 // a pollable fd is created and stored with each transfer
782 usbi_mutex_lock(&ctx->flying_transfers_lock);
783 list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
784 transfer_priv = usbi_transfer_get_os_priv(transfer);
785 if (transfer_priv->pollable_fd.fd == fds[i].fd) {
790 usbi_mutex_unlock(&ctx->flying_transfers_lock);
792 if (found && HasOverlappedIoCompleted(transfer_priv->pollable_fd.overlapped)) {
793 io_result = (DWORD)transfer_priv->pollable_fd.overlapped->Internal;
794 io_size = (DWORD)transfer_priv->pollable_fd.overlapped->InternalHigh;
795 usbi_remove_pollfd(ctx, transfer_priv->pollable_fd.fd);
796 // let handle_callback free the event using the transfer wfd
797 // If you don't use the transfer wfd, you run a risk of trying to free a
798 // newly allocated wfd that took the place of the one from the transfer.
799 wince_handle_callback(transfer, io_result, io_size);
801 usbi_err(ctx, "matching transfer for fd %d has not completed", fds[i]);
802 r = LIBUSB_ERROR_OTHER;
805 usbi_err(ctx, "could not find a matching transfer for fd %d", fds[i]);
806 r = LIBUSB_ERROR_NOT_FOUND;
810 usbi_mutex_unlock(&ctx->open_devs_lock);
816 * Monotonic and real time functions
818 static int wince_clock_gettime(int clk_id, struct timespec *tp)
820 LARGE_INTEGER hires_counter;
821 ULARGE_INTEGER rtime;
826 case USBI_CLOCK_MONOTONIC:
827 if (hires_frequency != 0 && QueryPerformanceCounter(&hires_counter)) {
828 tp->tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
829 tp->tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency) / 1000) * hires_ticks_to_ps);
830 return LIBUSB_SUCCESS;
832 // Fall through and return real-time if monotonic read failed or was not detected @ init
833 case USBI_CLOCK_REALTIME:
834 // We follow http://msdn.microsoft.com/en-us/library/ms724928%28VS.85%29.aspx
835 // with a predef epoch time to have an epoch that starts at 1970.01.01 00:00
836 // Note however that our resolution is bounded by the Windows system time
837 // functions and is at best of the order of 1 ms (or, usually, worse)
839 SystemTimeToFileTime(&st, &filetime);
840 rtime.LowPart = filetime.dwLowDateTime;
841 rtime.HighPart = filetime.dwHighDateTime;
842 rtime.QuadPart -= EPOCH_TIME;
843 tp->tv_sec = (long)(rtime.QuadPart / 10000000);
844 tp->tv_nsec = (long)((rtime.QuadPart % 10000000)*100);
845 return LIBUSB_SUCCESS;
847 return LIBUSB_ERROR_INVALID_PARAM;
851 const struct usbi_os_backend usbi_backend = {
857 wince_get_device_list,
858 NULL, /* hotplug_poll */
862 wince_get_device_descriptor,
863 wince_get_active_config_descriptor,
864 wince_get_config_descriptor,
865 NULL, /* get_config_descriptor_by_value() */
867 wince_get_configuration,
868 wince_set_configuration,
869 wince_claim_interface,
870 wince_release_interface,
872 wince_set_interface_altsetting,
876 NULL, /* alloc_streams */
877 NULL, /* free_streams */
879 NULL, /* dev_mem_alloc() */
880 NULL, /* dev_mem_free() */
882 wince_kernel_driver_active,
883 wince_detach_kernel_driver,
884 wince_attach_kernel_driver,
886 wince_destroy_device,
888 wince_submit_transfer,
889 wince_cancel_transfer,
890 wince_clear_transfer_priv,
893 NULL, /* handle_transfer_completion() */
896 sizeof(struct wince_device_priv),
898 sizeof(struct wince_transfer_priv),