pnp.c File Reference

#include "serial.h"
#include <stdio.h>
#include <ndk/haltypes.h>
#include <debug.h>

Include dependency graph for pnp.c:

Go to the source code of this file.

Functions
NTSTATUS NTAPI	SerialAddDeviceInternal (IN PDRIVER_OBJECT DriverObject, IN PDEVICE_OBJECT Pdo, IN UART_TYPE UartType, IN PULONG pComPortNumber OPTIONAL, OUT PDEVICE_OBJECT *pFdo OPTIONAL)
NTSTATUS NTAPI	SerialAddDevice (IN PDRIVER_OBJECT DriverObject, IN PDEVICE_OBJECT Pdo)
NTSTATUS NTAPI	SerialPnpStartDevice (IN PDEVICE_OBJECT DeviceObject, IN PCM_RESOURCE_LIST ResourceList, IN PCM_RESOURCE_LIST ResourceListTranslated)
NTSTATUS NTAPI	SerialPnp (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)

Function Documentation

SerialAddDevice()

NTSTATUS NTAPI SerialAddDevice	(	IN PDRIVER_OBJECT	DriverObject,
		IN PDEVICE_OBJECT	Pdo
	)

Definition at line 118 of file pnp.c.

{
    /* Serial.sys is a legacy driver. AddDevice is called once
     * with a NULL Pdo just after the driver initialization.
     * Detect this case and return success.
     */
    if (Pdo == NULL)
        return STATUS_SUCCESS;
 
    /* We have here a PDO not null. It represents a real serial
     * port. So call the internal AddDevice function.
     */
    return SerialAddDeviceInternal(DriverObject, Pdo, UartUnknown, NULL, NULL);
}

SerialAddDeviceInternal()

NTSTATUS NTAPI SerialAddDeviceInternal	(	IN PDRIVER_OBJECT	DriverObject,
		IN PDEVICE_OBJECT	Pdo,
		IN UART_TYPE	UartType,
		IN PULONG pComPortNumber	OPTIONAL,
		OUT PDEVICE_OBJECT *pFdo	OPTIONAL
	)

Definition at line 18 of file pnp.c.

{
    PDEVICE_OBJECT Fdo = NULL;
    PSERIAL_DEVICE_EXTENSION DeviceExtension = NULL;
    NTSTATUS Status;
    WCHAR DeviceNameBuffer[32];
    UNICODE_STRING DeviceName;
 
    TRACE_(SERIAL, "SerialAddDeviceInternal()\n");
 
    ASSERT(DriverObject);
    ASSERT(Pdo);
 
    /* Create new device object */
    swprintf(DeviceNameBuffer, L"\\Device\\Serial%lu", IoGetConfigurationInformation()->SerialCount);
    RtlInitUnicodeString(&DeviceName, DeviceNameBuffer);
    Status = IoCreateDevice(DriverObject,
                            sizeof(SERIAL_DEVICE_EXTENSION),
                            &DeviceName,
                            FILE_DEVICE_SERIAL_PORT,
                            FILE_DEVICE_SECURE_OPEN,
                            FALSE,
                            &Fdo);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "IoCreateDevice() failed with status 0x%08x\n", Status);
        Fdo = NULL;
        goto ByeBye;
    }
    DeviceExtension = (PSERIAL_DEVICE_EXTENSION)Fdo->DeviceExtension;
    RtlZeroMemory(DeviceExtension, sizeof(SERIAL_DEVICE_EXTENSION));
 
    /* Register device interface */
    Status = IoRegisterDeviceInterface(Pdo, &GUID_DEVINTERFACE_COMPORT, NULL, &DeviceExtension->SerialInterfaceName);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "IoRegisterDeviceInterface() failed with status 0x%08x\n", Status);
        goto ByeBye;
    }
 
    DeviceExtension->SerialPortNumber = IoGetConfigurationInformation()->SerialCount++;
    if (pComPortNumber == NULL)
        DeviceExtension->ComPort = DeviceExtension->SerialPortNumber + 1;
    else
        DeviceExtension->ComPort = *pComPortNumber;
    DeviceExtension->Pdo = Pdo;
    DeviceExtension->PnpState = dsStopped;
    DeviceExtension->UartType = UartType;
    Status = InitializeCircularBuffer(&DeviceExtension->InputBuffer, 16);
    if (!NT_SUCCESS(Status)) goto ByeBye;
    Status = InitializeCircularBuffer(&DeviceExtension->OutputBuffer, 16);
    if (!NT_SUCCESS(Status)) goto ByeBye;
    IoInitializeRemoveLock(&DeviceExtension->RemoveLock, SERIAL_TAG, 0, 0);
    KeInitializeSpinLock(&DeviceExtension->InputBufferLock);
    KeInitializeSpinLock(&DeviceExtension->OutputBufferLock);
    KeInitializeEvent(&DeviceExtension->InputBufferNotEmpty, NotificationEvent, FALSE);
    KeInitializeDpc(&DeviceExtension->ReceivedByteDpc, SerialReceiveByte, DeviceExtension);
    KeInitializeDpc(&DeviceExtension->SendByteDpc, SerialSendByte, DeviceExtension);
    KeInitializeDpc(&DeviceExtension->CompleteIrpDpc, SerialCompleteIrp, DeviceExtension);
    Status = IoAttachDeviceToDeviceStackSafe(Fdo, Pdo, &DeviceExtension->LowerDevice);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "IoAttachDeviceToDeviceStackSafe() failed with status 0x%08x\n", Status);
        goto ByeBye;
    }
    if (DeviceExtension->LowerDevice->Flags & DO_POWER_PAGABLE)
        Fdo->Flags |= DO_POWER_PAGABLE;
    if (DeviceExtension->LowerDevice->Flags & DO_BUFFERED_IO)
        Fdo->Flags |= DO_BUFFERED_IO;
    if (DeviceExtension->LowerDevice->Flags & DO_DIRECT_IO)
        Fdo->Flags |= DO_DIRECT_IO;
 
    /* Choose default strategy */
    if ((Fdo->Flags & (DO_BUFFERED_IO | DO_DIRECT_IO)) == 0)
        Fdo->Flags |= DO_BUFFERED_IO;
 
    Fdo->Flags &= ~DO_DEVICE_INITIALIZING;
    if (pFdo)
    {
        *pFdo = Fdo;
    }
 
    return STATUS_SUCCESS;
 
ByeBye:
    if (Fdo)
    {
        FreeCircularBuffer(&DeviceExtension->InputBuffer);
        FreeCircularBuffer(&DeviceExtension->OutputBuffer);
        IoDeleteDevice(Fdo);
    }
    return Status;
}

Referenced by SerialAddDevice().

SerialPnp()

NTSTATUS NTAPI SerialPnp	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 327 of file pnp.c.

{
    PSERIAL_DEVICE_EXTENSION DeviceExtension;
    ULONG MinorFunction;
    PIO_STACK_LOCATION Stack;
    ULONG_PTR Information = 0;
    NTSTATUS Status;
 
    Stack = IoGetCurrentIrpStackLocation(Irp);
    MinorFunction = Stack->MinorFunction;
 
    switch (MinorFunction)
    {
        /* FIXME: do all these minor functions
        IRP_MN_QUERY_REMOVE_DEVICE 0x1
        IRP_MN_REMOVE_DEVICE 0x2
        {
            TRACE_(SERIAL, "IRP_MJ_PNP / IRP_MN_REMOVE_DEVICE\n");
            IoAcquireRemoveLock
            IoReleaseRemoveLockAndWait
            pass request to DeviceExtension-LowerDriver
            disable interface
            IoDeleteDevice(Fdo) and/or IoDetachDevice
            break;
        }
        IRP_MN_CANCEL_REMOVE_DEVICE 0x3
        IRP_MN_STOP_DEVICE 0x4
        IRP_MN_QUERY_STOP_DEVICE 0x5
        IRP_MN_CANCEL_STOP_DEVICE 0x6
        IRP_MN_QUERY_DEVICE_RELATIONS / BusRelations (optional) 0x7
        IRP_MN_QUERY_DEVICE_RELATIONS / RemovalRelations (optional) 0x7
        IRP_MN_QUERY_INTERFACE (optional) 0x8
        IRP_MN_QUERY_CAPABILITIES (optional) 0x9
        IRP_MN_FILTER_RESOURCE_REQUIREMENTS (optional) 0xd
        IRP_MN_QUERY_PNP_DEVICE_STATE (optional) 0x14
        IRP_MN_DEVICE_USAGE_NOTIFICATION (required or optional) 0x16
        IRP_MN_SURPRISE_REMOVAL 0x17
        */
        case IRP_MN_START_DEVICE: /* 0x0 */
        {
            TRACE_(SERIAL, "IRP_MJ_PNP / IRP_MN_START_DEVICE\n");
 
            /* Call lower driver */
            DeviceExtension = DeviceObject->DeviceExtension;
            Status = STATUS_UNSUCCESSFUL;
 
            ASSERT(DeviceExtension->PnpState == dsStopped);
 
            if (IoForwardIrpSynchronously(DeviceExtension->LowerDevice, Irp))
            {
                Status = Irp->IoStatus.Status;
                if (NT_SUCCESS(Status))
                {
                    Status = SerialPnpStartDevice(
                        DeviceObject,
                        Stack->Parameters.StartDevice.AllocatedResources,
                        Stack->Parameters.StartDevice.AllocatedResourcesTranslated);
                }
            }
 
            break;
        }
        case IRP_MN_QUERY_DEVICE_RELATIONS: /* (optional) 0x7 */
        {
            switch (Stack->Parameters.QueryDeviceRelations.Type)
            {
                case BusRelations:
                {
                    TRACE_(SERIAL, "IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS / BusRelations\n");
                    return ForwardIrpAndForget(DeviceObject, Irp);
                }
                case RemovalRelations:
                {
                    TRACE_(SERIAL, "IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS / RemovalRelations\n");
                    return ForwardIrpAndForget(DeviceObject, Irp);
                }
                default:
                    TRACE_(SERIAL, "IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS / Unknown type 0x%lx\n",
                        Stack->Parameters.QueryDeviceRelations.Type);
                    return ForwardIrpAndForget(DeviceObject, Irp);
            }
            break;
        }
        case IRP_MN_FILTER_RESOURCE_REQUIREMENTS: /* (optional) 0xd */
        {
            TRACE_(SERIAL, "IRP_MJ_PNP / IRP_MN_FILTER_RESOURCE_REQUIREMENTS\n");
            return ForwardIrpAndForget(DeviceObject, Irp);
        }
        default:
        {
            TRACE_(SERIAL, "Unknown minor function 0x%x\n", MinorFunction);
            return ForwardIrpAndForget(DeviceObject, Irp);
        }
    }
 
    Irp->IoStatus.Information = Information;
    Irp->IoStatus.Status = Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Status;
}

SerialPnpStartDevice()

NTSTATUS NTAPI SerialPnpStartDevice	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PCM_RESOURCE_LIST	ResourceList,
		IN PCM_RESOURCE_LIST	ResourceListTranslated
	)

Definition at line 136 of file pnp.c.

{
    PSERIAL_DEVICE_EXTENSION DeviceExtension;
    WCHAR DeviceNameBuffer[32];
    UNICODE_STRING DeviceName;
    WCHAR LinkNameBuffer[32];
    UNICODE_STRING LinkName;
    WCHAR ComPortBuffer[32];
    UNICODE_STRING ComPort;
    ULONG Vector = 0;
    ULONG i;
    UCHAR IER;
    KIRQL Dirql;
    KAFFINITY Affinity = 0;
    KINTERRUPT_MODE InterruptMode = Latched;
    BOOLEAN ShareInterrupt = TRUE;
    OBJECT_ATTRIBUTES objectAttributes;
    PUCHAR ComPortBase;
    UNICODE_STRING KeyName;
    HANDLE hKey;
    NTSTATUS Status;
 
    DeviceExtension = (PSERIAL_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
 
    ASSERT(DeviceExtension);
 
    if (!ResourceList)
    {
        WARN_(SERIAL, "No allocated resources sent to driver\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }
    if (ResourceList->Count != 1)
    {
        WARN_(SERIAL, "Wrong number of allocated resources sent to driver\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }
    if (ResourceList->List[0].PartialResourceList.Version != 1
     || ResourceList->List[0].PartialResourceList.Revision != 1
     || ResourceListTranslated->List[0].PartialResourceList.Version != 1
     || ResourceListTranslated->List[0].PartialResourceList.Revision != 1)
    {
        WARN_(SERIAL, "Revision mismatch: %u.%u != 1.1 or %u.%u != 1.1\n",
            ResourceList->List[0].PartialResourceList.Version,
            ResourceList->List[0].PartialResourceList.Revision,
            ResourceListTranslated->List[0].PartialResourceList.Version,
            ResourceListTranslated->List[0].PartialResourceList.Revision);
        return STATUS_REVISION_MISMATCH;
    }
 
    DeviceExtension->BaudRate = 19200;
    DeviceExtension->BaseAddress = 0;
    Dirql = 0;
    for (i = 0; i < ResourceList->List[0].PartialResourceList.Count; i++)
    {
        PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor = &ResourceList->List[0].PartialResourceList.PartialDescriptors[i];
        PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptorTranslated = &ResourceListTranslated->List[0].PartialResourceList.PartialDescriptors[i];
        switch (PartialDescriptor->Type)
        {
            case CmResourceTypePort:
                if (PartialDescriptor->u.Port.Length < 7)
                    return STATUS_INSUFFICIENT_RESOURCES;
                if (DeviceExtension->BaseAddress != 0)
                    return STATUS_UNSUCCESSFUL;
                DeviceExtension->BaseAddress = PartialDescriptor->u.Port.Start.u.LowPart;
                break;
            case CmResourceTypeInterrupt:
                Dirql = (KIRQL)PartialDescriptorTranslated->u.Interrupt.Level;
                Vector = PartialDescriptorTranslated->u.Interrupt.Vector;
                Affinity = PartialDescriptorTranslated->u.Interrupt.Affinity;
                if (PartialDescriptorTranslated->Flags & CM_RESOURCE_INTERRUPT_LATCHED)
                    InterruptMode = Latched;
                else
                    InterruptMode = LevelSensitive;
                ShareInterrupt = (PartialDescriptorTranslated->ShareDisposition == CmResourceShareShared);
                break;
        }
    }
    INFO_(SERIAL, "New COM port. Base = 0x%lx, Irql = %u\n",
        DeviceExtension->BaseAddress, Dirql);
    if (!DeviceExtension->BaseAddress)
        return STATUS_INSUFFICIENT_RESOURCES;
    if (!Dirql)
        return STATUS_INSUFFICIENT_RESOURCES;
    ComPortBase = ULongToPtr(DeviceExtension->BaseAddress);
 
    /* Test if we are trying to start the serial port used for debugging */
    INFO_(SERIAL, "Comparing addresses: KdComPortInUse: %p, ComPortBase: %p\n", KdComPortInUse, ComPortBase);
    if (KdComPortInUse == ComPortBase)
    {
        INFO_(SERIAL, "Failing IRP_MN_START_DEVICE as this serial port is used for debugging\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    if (DeviceExtension->UartType == UartUnknown)
        DeviceExtension->UartType = SerialDetectUartType(ComPortBase);
 
    /* Get current settings */
    DeviceExtension->MCR = READ_PORT_UCHAR(SER_MCR(ComPortBase));
    DeviceExtension->MSR = READ_PORT_UCHAR(SER_MSR(ComPortBase));
    DeviceExtension->WaitMask = 0;
 
    /* Set baud rate */
    Status = SerialSetBaudRate(DeviceExtension, DeviceExtension->BaudRate);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "SerialSetBaudRate() failed with status 0x%08x\n", Status);
        return Status;
    }
 
    /* Set line control */
    DeviceExtension->SerialLineControl.StopBits = STOP_BIT_1;
    DeviceExtension->SerialLineControl.Parity = NO_PARITY;
    DeviceExtension->SerialLineControl.WordLength = 8;
    Status = SerialSetLineControl(DeviceExtension, &DeviceExtension->SerialLineControl);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "SerialSetLineControl() failed with status 0x%08x\n", Status);
        return Status;
    }
 
    /* Clear receive/transmit buffers */
    if (DeviceExtension->UartType >= Uart16550A)
    {
        /* 16550 UARTs also have FIFO queues, but they are unusable due to a bug */
        WRITE_PORT_UCHAR(SER_FCR(ComPortBase),
            SR_FCR_CLEAR_RCVR | SR_FCR_CLEAR_XMIT);
    }
 
    /* Create link \DosDevices\COMX -> \Device\SerialX */
    swprintf(DeviceNameBuffer, L"\\Device\\Serial%lu", DeviceExtension->SerialPortNumber);
    swprintf(LinkNameBuffer, L"\\DosDevices\\COM%lu", DeviceExtension->ComPort);
    swprintf(ComPortBuffer, L"COM%lu", DeviceExtension->ComPort);
    RtlInitUnicodeString(&DeviceName, DeviceNameBuffer);
    RtlInitUnicodeString(&LinkName, LinkNameBuffer);
    RtlInitUnicodeString(&ComPort, ComPortBuffer);
    Status = IoCreateSymbolicLink(&LinkName, &DeviceName);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "IoCreateSymbolicLink() failed with status 0x%08x\n", Status);
        return Status;
    }
 
    /* Connect interrupt and enable them */
    Status = IoConnectInterrupt(
        &DeviceExtension->Interrupt, SerialInterruptService,
        DeviceObject, NULL,
        Vector, Dirql, Dirql,
        InterruptMode, ShareInterrupt,
        Affinity, FALSE);
    if (!NT_SUCCESS(Status))
    {
        WARN_(SERIAL, "IoConnectInterrupt() failed with status 0x%08x\n", Status);
        IoSetDeviceInterfaceState(&DeviceExtension->SerialInterfaceName, FALSE);
        IoDeleteSymbolicLink(&LinkName);
        return Status;
    }
 
    /* Write an entry value under HKLM\HARDWARE\DeviceMap\SERIALCOMM */
    /* This step is not mandatory, so don't exit in case of error */
    RtlInitUnicodeString(&KeyName, L"\\Registry\\Machine\\HARDWARE\\DeviceMap\\SERIALCOMM");
    InitializeObjectAttributes(&objectAttributes, &KeyName, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
    Status = ZwCreateKey(&hKey, KEY_SET_VALUE, &objectAttributes, 0, NULL, REG_OPTION_VOLATILE, NULL);
    if (NT_SUCCESS(Status))
    {
        /* Key = \Device\Serialx, Value = COMx */
        ZwSetValueKey(hKey, &DeviceName, 0, REG_SZ, ComPortBuffer, ComPort.Length + sizeof(WCHAR));
        ZwClose(hKey);
    }
 
    DeviceExtension->PnpState = dsStarted;
 
    /* Activate interrupt modes */
    IER = READ_PORT_UCHAR(SER_IER(ComPortBase));
    IER |= SR_IER_DATA_RECEIVED | SR_IER_THR_EMPTY | SR_IER_LSR_CHANGE | SR_IER_MSR_CHANGE;
    WRITE_PORT_UCHAR(SER_IER(ComPortBase), IER);
 
    /* Activate DTR, RTS */
    DeviceExtension->MCR |= SR_MCR_DTR | SR_MCR_RTS;
    WRITE_PORT_UCHAR(SER_MCR(ComPortBase), DeviceExtension->MCR);
 
    /* Activate serial interface */
    IoSetDeviceInterfaceState(&DeviceExtension->SerialInterfaceName, TRUE);
    /* We don't really care if the call succeeded or not... */
 
    return STATUS_SUCCESS;
}

Referenced by SerialPnp().