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180 lines
3.9 KiB
180 lines
3.9 KiB
/*++
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Copyright (c) 1995,1996 Microsoft Corporation
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:ts=4
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Module Name:
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control.c
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Abstract:
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The module contains functions specific to control type
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transactions on the USB.
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Environment:
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kernel mode only
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Notes:
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Revision History:
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11-01-95 : created
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--*/
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#include "wdm.h"
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#include "stdarg.h"
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#include "stdio.h"
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#include "usbdi.h"
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#include "hcdi.h"
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#include "uhcd.h"
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// BUBUG inline?
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VOID
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UHCD_PrepareStatusPacket(
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IN PHW_TRANSFER_DESCRIPTOR TransferDescriptor,
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IN PUHCD_ENDPOINT Endpoint,
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IN PHCD_URB Urb
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)
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/*++
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Routine Description:
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Prepare the status phase for an control transfer.
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Arguments:
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TransferDescriptor - TransferDescriptor for status phase.
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Endpoint - endpoint associated with this transfer.
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Urb - pointer to URB Request for control transfer.
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Return Value:
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None.
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--*/
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{
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PHCD_EXTENSION urbWork = HCD_AREA(Urb).HcdExtension;
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ASSERT_ENDPOINT(Endpoint);
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// since we may be using a recycled TD, we will re-init now
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UHCD_InitializeAsyncTD(Endpoint, TransferDescriptor);
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//
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// tracks the nth packet in this transfer
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//
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urbWork->PacketsProcessed++;
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// Status phase is a null packet
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// in the opposite direction
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TransferDescriptor->InterruptOnComplete = 1;
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//data toggle must be 1 for status phase
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Endpoint->DataToggle = 1;
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TransferDescriptor->RetryToggle = Endpoint->DataToggle;
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Endpoint->DataToggle ^=1;
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#if DBG
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// bugbug use this field to detect if we
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// process the same TD twice
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TransferDescriptor->Frame = 0;
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#endif
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TransferDescriptor->MaxLength = NULL_PACKET_LENGTH;
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if (DATA_DIRECTION_IN(Urb))
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TransferDescriptor->PID = USB_OUT_PID;
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else
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TransferDescriptor->PID = USB_IN_PID;
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//
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// NOTE:
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// for status phase -- set the t bit in the HW_Link
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// field, this is done by the caller.
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//
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LOG_TD('stTD', TransferDescriptor);
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UHCD_KdPrint((2, "'**TD for STATUS PHASE\n"));
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UHCD_Debug_DumpTD(TransferDescriptor);
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}
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// BUBUG inline?
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VOID
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UHCD_PrepareSetupPacket(
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IN PHW_TRANSFER_DESCRIPTOR TransferDescriptor,
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IN PUHCD_ENDPOINT Endpoint,
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IN PHCD_URB Urb
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)
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/*++
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Routine Description:
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Prepare the status phase for an control transfer.
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Arguments:
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TransferDescriptor - TransferDescriptor for setup phase.
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Endpoint - endpoint associated with this transfer.
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Urb - pointer to URB Request for control transfer.
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Return Value:
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None.
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--*/
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{
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PUHCD_HARDWARE_DESCRIPTOR_LIST hwDescriptorList;
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PHCD_EXTENSION urbWork = HCD_AREA(Urb).HcdExtension;
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ASSERT_ENDPOINT(Endpoint);
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//
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// tracks the nth packet in this transfer
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//
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urbWork->PacketsProcessed++;
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// BUGBUG only one request for control
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UHCD_ASSERT(Endpoint->MaxRequests == 1);
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hwDescriptorList = Endpoint->HardwareDescriptorList[0];
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// since we may be using a recycled TD, we will re-init now
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UHCD_InitializeAsyncTD(Endpoint, TransferDescriptor);
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//data toggle must be 0 for setup
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//BUGBUG reset data toggle in ENDPOINT
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Endpoint->DataToggle = 0;
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TransferDescriptor->RetryToggle = Endpoint->DataToggle;
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Endpoint->DataToggle ^=1;
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TransferDescriptor->PID = USB_SETUP_PID;
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TransferDescriptor->MaxLength =
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UHCD_SYSTEM_TO_USB_BUFFER_LENGTH(sizeof(Urb->HcdUrbCommonTransfer.Extension.u.SetupPacket));
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// Copy the setup packet in to the scratch buffer
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RtlCopyMemory(hwDescriptorList->ScratchBufferVirtualAddress,
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&Urb->HcdUrbCommonTransfer.Extension.u.SetupPacket[0],
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sizeof(Urb->HcdUrbCommonTransfer.Extension.u.SetupPacket));
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TransferDescriptor->PacketBuffer = hwDescriptorList->ScratchBufferLogicalAddress;
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LOG_TD('SuTD', TransferDescriptor);
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UHCD_KdPrint((2, "'**TD for setup packet\n"));
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UHCD_Debug_DumpTD(TransferDescriptor);
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}
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