Windows: Added isochronous support via libusbk

[dickens] Rebased against latest changes and fixed some styling issues

Closes #246

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>

4 files changed, 146 insertions, 2 deletions

diff --git a/libusb/os/windows_nt_shared_types.h b/libusb/os/windows_nt_shared_types.h
index 1f5cfbd..68bf261 100644
--- a/libusb/os/windows_nt_shared_types.h
+++ b/libusb/os/windows_nt_shared_types.h
@@ -134,4 +134,5 @@ struct winusb_transfer_priv {
 	uint8_t *hid_buffer; // 1 byte extended data buffer, required for HID
 	uint8_t *hid_dest;   // transfer buffer destination, required for HID
 	size_t hid_expected_size;
+	void *iso_context;
 };
diff --git a/libusb/os/windows_winusb.c b/libusb/os/windows_winusb.c
index b07e67a..ff86db6 100644
--- a/libusb/os/windows_winusb.c
+++ b/libusb/os/windows_winusb.c
@@ -66,6 +66,7 @@ static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev
 static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
 static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
 static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting);
+static int winusbx_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer);
 static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
 static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
 static int winusbx_abort_transfers(int sub_api, struct usbi_transfer *itransfer);
@@ -1734,6 +1735,8 @@ static void winusb_clear_transfer_priv(struct usbi_transfer *itransfer)
 	transfer_priv->pollable_fd = INVALID_WINFD;
 	transfer_priv->handle = NULL;
 	safe_free(transfer_priv->hid_buffer);
+	safe_free(transfer_priv->iso_context);
+
 	// When auto claim is in use, attempt to release the auto-claimed interface
 	auto_release(itransfer);
 }
@@ -1966,7 +1969,7 @@ const struct windows_usb_api_backend usb_api_backend[USB_API_MAX] = {
 		winusbx_clear_halt,
 		winusbx_reset_device,
 		winusbx_submit_bulk_transfer,
-		NULL,	/* submit_iso_transfer */
+		winusbx_submit_iso_transfer,
 		winusbx_submit_control_transfer,
 		winusbx_abort_control,
 		winusbx_abort_transfers,
@@ -2059,6 +2062,8 @@ static int winusbx_init(struct libusb_context *ctx)
 		WinUSBX_Set(SetCurrentAlternateSetting);
 		WinUSBX_Set(SetPipePolicy);
 		WinUSBX_Set(WritePipe);
+		WinUSBX_Set(IsoReadPipe);
+		WinUSBX_Set(IsoWritePipe);
 
 		if (WinUSBX[i].Initialize != NULL) {
 			WinUSBX[i].initialized = true;
@@ -2473,6 +2478,78 @@ static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_ha
 	return LIBUSB_SUCCESS;
 }
 
+static int winusbx_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
+	struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
+	struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
+	struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev);
+	HANDLE winusb_handle;
+	OVERLAPPED *overlapped;
+	bool ret;
+	int current_interface;
+	int i;
+	UINT offset;
+	PKISO_CONTEXT iso_context;
+	size_t iso_ctx_size;
+
+	CHECK_WINUSBX_AVAILABLE(sub_api);
+
+	if ((sub_api != SUB_API_LIBUSBK) && (sub_api != SUB_API_LIBUSB0)) {
+		// iso only supported on libusbk-based backends
+		PRINT_UNSUPPORTED_API(submit_iso_transfer);
+	};
+
+	current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
+	if (current_interface < 0) {
+		usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer");
+		return LIBUSB_ERROR_NOT_FOUND;
+	}
+
+	usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface);
+
+	transfer_priv->handle = winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
+	overlapped = transfer_priv->pollable_fd.overlapped;
+
+	iso_ctx_size = sizeof(KISO_CONTEXT) + (transfer->num_iso_packets * sizeof(KISO_PACKET));
+	transfer_priv->iso_context = iso_context = calloc(1, iso_ctx_size);
+	if (transfer_priv->iso_context == NULL)
+		return LIBUSB_ERROR_NO_MEM;
+
+	// start ASAP
+	iso_context->StartFrame = 0;
+	iso_context->NumberOfPackets = (SHORT)transfer->num_iso_packets;
+
+	// convert the transfer packet lengths to iso_packet offsets
+	offset = 0;
+	for (i = 0; i < transfer->num_iso_packets; i++) {
+		iso_context->IsoPackets[i].offset = offset;
+		offset += transfer->iso_packet_desc[i].length;
+	}
+
+	if (IS_XFERIN(transfer)) {
+		usbi_dbg("reading %d iso packets", transfer->num_iso_packets);
+		ret = WinUSBX[sub_api].IsoReadPipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, overlapped, iso_context);
+	} else {
+		usbi_dbg("writing %d iso packets", transfer->num_iso_packets);
+		ret = WinUSBX[sub_api].IsoWritePipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, overlapped, iso_context);
+	}
+
+	if (!ret) {
+		if (GetLastError() != ERROR_IO_PENDING) {
+			usbi_err(ctx, "IsoReadPipe/IsoWritePipe failed: %s", windows_error_str(0));
+			return LIBUSB_ERROR_IO;
+		}
+	} else {
+		windows_force_sync_completion(overlapped, (ULONG)transfer->length);
+	}
+
+	transfer_priv->interface_number = (uint8_t)current_interface;
+
+	return LIBUSB_SUCCESS;
+}
+
 static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer)
 {
 	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
@@ -2654,6 +2731,30 @@ static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_ha
 
 static int winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size)
 {
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
+	struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev);
+	PKISO_CONTEXT iso_context;
+	int i;
+
+	if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
+		CHECK_WINUSBX_AVAILABLE(sub_api);
+
+		// for isochronous, need to copy the individual iso packet actual_lengths and statuses
+		if ((sub_api == SUB_API_LIBUSBK) || (sub_api == SUB_API_LIBUSB0)) {
+			// iso only supported on libusbk-based backends for now
+			iso_context = transfer_priv->iso_context;
+			for (i = 0; i < transfer->num_iso_packets; i++) {
+				transfer->iso_packet_desc[i].actual_length = iso_context->IsoPackets[i].actual_length;
+				// TODO translate USDB_STATUS codes http://msdn.microsoft.com/en-us/library/ff539136(VS.85).aspx to libusb_transfer_status
+				//transfer->iso_packet_desc[i].status = transfer_priv->iso_context->IsoPackets[i].status;
+			}
+		} else {
+			// This should only occur if backend is not set correctly or other backend isoc is partially implemented
+			PRINT_UNSUPPORTED_API(copy_transfer_data);
+		}
+	}
+
 	itransfer->transferred += io_size;
 	return LIBUSB_TRANSFER_COMPLETED;
 }
diff --git a/libusb/os/windows_winusb.h b/libusb/os/windows_winusb.h
index 9b4a0f6..3bdf185 100644
--- a/libusb/os/windows_winusb.h
+++ b/libusb/os/windows_winusb.h
@@ -554,6 +554,46 @@ typedef VOID (WINAPI *LibK_GetVersion_t)(
 	PKLIB_VERSION Version
 );
 
+//KISO_PACKET is equivalent of libusb_iso_packet_descriptor except uses absolute "offset" field instead of sequential Lengths
+typedef struct _KISO_PACKET {
+	UINT offset;
+	USHORT actual_length; //changed from libusbk_shared.h "Length" for clarity
+	USHORT status;
+} KISO_PACKET, *PKISO_PACKET;
+
+typedef enum _KISO_FLAG {
+	KISO_FLAG_NONE = 0,
+	KISO_FLAG_SET_START_FRAME = 0x00000001,
+} KISO_FLAG;
+
+//KISO_CONTEXT is the conceptual equivalent of libusb_transfer except is isochronous-specific and must match libusbk's version
+typedef struct _KISO_CONTEXT {
+	KISO_FLAG Flags;
+	UINT StartFrame;
+	SHORT ErrorCount;
+	SHORT NumberOfPackets;
+	UINT UrbHdrStatus;
+	KISO_PACKET IsoPackets[0];
+} KISO_CONTEXT, *PKISO_CONTEXT;
+
+typedef BOOL(WINAPI *WinUsb_IsoReadPipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID,
+	PUCHAR Buffer,
+	ULONG BufferLength,
+	LPOVERLAPPED Overlapped,
+	PKISO_CONTEXT IsoContext
+);
+
+typedef BOOL(WINAPI *WinUsb_IsoWritePipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID,
+	PUCHAR Buffer,
+	ULONG BufferLength,
+	LPOVERLAPPED Overlapped,
+	PKISO_CONTEXT IsoContext
+);
+
 struct winusb_interface {
 	bool initialized;
 	WinUsb_AbortPipe_t AbortPipe;
@@ -568,6 +608,8 @@ struct winusb_interface {
 	WinUsb_SetCurrentAlternateSetting_t SetCurrentAlternateSetting;
 	WinUsb_SetPipePolicy_t SetPipePolicy;
 	WinUsb_WritePipe_t WritePipe;
+	WinUsb_IsoReadPipe_t IsoReadPipe;
+	WinUsb_IsoWritePipe_t IsoWritePipe;
 };
 
 /* hid.dll interface */
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 203581d..f2e6efa 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11286
+#define LIBUSB_NANO 11287