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/*++
Module Name:
Device.h
Abstract:
This file contains the device declarations.
Environment:
Kernel-mode Driver Framework
--*/
//
// The I2C_REQUEST_SOURCE enum defines the type of requests that we sent to I2C controller.
// At any time there will be at most one request per source type. For example:
//
// 1 - We receive an incoming request from EvtIoDeviceControl. The queue is sequential and
// thus we'll get at most one incoming request at any time.
// 2 - On response, we can:
// * Either send an async request to I2C controller (SourceAsync). Its completion routine
// will complete the parent incoming request automatically;
// * Or send one or multiple sync requests (SourceClient). The caller needs to complete the
// parent incoming request manually.
// 3 - Also when I2C controller triggers an interrupt, the ISR handler can also:
// * Send a sync request (SourceAlertIsr). The caller also needs to complete the parent
// incoming request manually later.
//
enum I2C_REQUEST_SOURCE
{
I2CRequestSourceAsync = 0,
I2CRequestSourceClient,
I2CRequestSourceAlertIsr,
I2CRequestSourceMax
};
typedef struct _DEVICE_CONTEXT
{
WDFDEVICE Device;
UCMTCPCIPORTCONTROLLER PortController;
// Request that we recieved from I/O queue.
WDFREQUEST IncomingRequest;
// Requests that we created and sent out.
WDFREQUEST OutgoingRequests[I2CRequestSourceMax];
// An alias since we use this async request frequently.
#define I2CAsyncRequest \
OutgoingRequests[I2CRequestSourceAsync]
// Alert processing.
WDFINTERRUPT AlertInterrupt;
WDFIOTARGET I2CIoTarget;
UINT8 I2CRegisterAddress;
LARGE_INTEGER I2CConnectionId;
WDFMEMORY I2CMemory;
UINT8 I2CAsyncBuffer[I2C_BUFFER_SIZE];
// Used to perform a device reset.
DEVICE_RESET_INTERFACE_STANDARD ResetInterface;
UINT8 ResetAttempts;
WDFWORKITEM I2CWorkItemGetStatus;
WDFWORKITEM I2CWorkItemGetControl;
} DEVICE_CONTEXT, *PDEVICE_CONTEXT;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(DEVICE_CONTEXT, DeviceGetContext)
typedef struct _WORKITEM_CONTEXT
{
WDFDEVICE Device;
WDFREQUEST Request;
} WORKITEM_CONTEXT, *PWORKITEM_CONTEXT;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(WORKITEM_CONTEXT, WorkitemGetContext);
EXTERN_C_START
NTSTATUS
EvtCreateDevice(
_Inout_ PWDFDEVICE_INIT DeviceInit
);
EVT_WDF_DEVICE_PREPARE_HARDWARE
EvtPrepareHardware;
EVT_WDF_DEVICE_D0_ENTRY
EvtDeviceD0Entry;
EVT_WDF_DEVICE_RELEASE_HARDWARE
EvtReleaseHardware;
EXTERN_C_END
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