540 lines
17 KiB
C
540 lines
17 KiB
C
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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ioctl.c
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Abstract: Contains routines to support ioctl queries for the SMB Back Light
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device.
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Environment:
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Kernel mode
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Author:
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Michael Tsang (MikeTs) 20-Nov-2000
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Revision History:
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--*/
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#include "pch.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, SmbLiteIoctl)
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#pragma alloc_text(PAGE, GetBackLightBrightness)
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#pragma alloc_text(PAGE, RegQueryDeviceParam)
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#endif
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/*++
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@doc EXTERNAL
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@func NTSTATUS | SmbLiteIoctl |
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Process the Device Control IRPs sent to this device.
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@parm IN PDRIVER_OBJECT | DevObj | Points to the driver object.
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@parm IN PIRP | Irp | Points to an I/O Request Packet.
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@rvalue SUCCESS | returns STATUS_SUCCESS
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@rvalue FAILURE | returns NT status code
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--*/
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NTSTATUS EXTERNAL
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SmbLiteIoctl(
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IN PDEVICE_OBJECT DevObj,
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IN PIRP Irp
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)
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{
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PROCNAME("SmbLiteIoctl")
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NTSTATUS status;
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PIO_STACK_LOCATION irpsp;
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PSMBLITE_DEVEXT devext;
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PAGED_CODE();
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irpsp = IoGetCurrentIrpStackLocation(Irp);
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ENTER(1, ("(DevObj=%p,Irp=%p,IrpSp=%p,Ioctl=%s)\n",
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DevObj, Irp, irpsp,
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LookupName(irpsp->Parameters.DeviceIoControl.IoControlCode,
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IoctlNames)));
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devext = DevObj->DeviceExtension;
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status = IoAcquireRemoveLock(&devext->RemoveLock, Irp);
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if (NT_SUCCESS(status))
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{
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BOOLEAN fNeedCompletion = TRUE;
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ASSERT(devext->dwfSmbLite & SMBLITEF_DEVICE_STARTED);
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Irp->IoStatus.Information = 0;
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switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
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{
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case IOCTL_SMBLITE_GETBRIGHTNESS:
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if (irpsp->Parameters.DeviceIoControl.OutputBufferLength <
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sizeof(SMBLITE_BRIGHTNESS))
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{
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status = STATUS_BUFFER_TOO_SMALL;
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WARNPRINT(("GetBrightness buffer too small (len=%d,required=%d).\n",
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irpsp->Parameters.DeviceIoControl.OutputBufferLength,
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sizeof(SMBLITE_BRIGHTNESS)));
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}
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else
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{
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PSMBLITE_BRIGHTNESS Brightness = Irp->UserBuffer;
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try
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{
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ProbeForWrite(Brightness,
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sizeof(*Brightness),
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sizeof(UCHAR));
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}
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except (EXCEPTION_EXECUTE_HANDLER)
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{
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status = GetExceptionCode();
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WARNPRINT(("Invalid GetBrightness buffer (status=%x,Buff=%p).\n",
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status, Brightness));
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}
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if (NT_SUCCESS(status))
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{
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status = GetBackLightBrightness(devext, Brightness);
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if (NT_SUCCESS(status))
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{
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Irp->IoStatus.Information = sizeof(*Brightness);
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}
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}
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}
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break;
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case IOCTL_SMBLITE_SETBRIGHTNESS:
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if (irpsp->Parameters.DeviceIoControl.InputBufferLength !=
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sizeof(SMBLITE_SETBRIGHTNESS))
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{
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status = STATUS_INFO_LENGTH_MISMATCH;
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WARNPRINT(("SetBrightness buffer length mismatch (len=%d,required=%d).\n",
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irpsp->Parameters.DeviceIoControl.InputBufferLength,
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sizeof(SMBLITE_SETBRIGHTNESS)));
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}
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else
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{
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PSMBLITE_SETBRIGHTNESS SetBrightness = (PSMBLITE_SETBRIGHTNESS)
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irpsp->Parameters.DeviceIoControl.Type3InputBuffer;
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try
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{
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ProbeForRead(SetBrightness,
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sizeof(*SetBrightness),
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sizeof(UCHAR));
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}
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except (EXCEPTION_EXECUTE_HANDLER)
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{
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status = GetExceptionCode();
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WARNPRINT(("Invalid SetBrightness buffer (status=%x,Buff=%p).\n",
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status, SetBrightness));
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}
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if (NT_SUCCESS(status))
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{
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status = SetBackLightBrightness(
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devext,
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&SetBrightness->Brightness,
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SetBrightness->fSaveSettings);
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}
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}
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break;
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#ifdef SYSACC
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case IOCTL_SYSACC_MEM_REQUEST:
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status = STATUS_NOT_SUPPORTED;
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break;
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case IOCTL_SYSACC_IO_REQUEST:
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status = STATUS_NOT_SUPPORTED;
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break;
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case IOCTL_SYSACC_PCICFG_REQUEST:
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status = STATUS_NOT_SUPPORTED;
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break;
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case IOCTL_SYSACC_SMBUS_REQUEST:
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if ((irpsp->Parameters.DeviceIoControl.InputBufferLength <
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sizeof(SMB_REQUEST)) ||
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(irpsp->Parameters.DeviceIoControl.OutputBufferLength <
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sizeof(SMB_REQUEST)))
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{
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status = STATUS_BUFFER_TOO_SMALL;
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WARNPRINT(("SMBusRequest buffer too small (len=%d,required=%d).\n",
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irpsp->Parameters.DeviceIoControl.InputBufferLength,
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sizeof(SMB_REQUEST)));
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}
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else
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{
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PSMB_REQUEST SmbReqIn = (PSMB_REQUEST)
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Irp->AssociatedIrp.SystemBuffer;
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PSMB_REQUEST SmbReqOut = (PSMB_REQUEST)
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Irp->UserBuffer;
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try
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{
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ProbeForWrite(SmbReqOut,
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sizeof(*SmbReqOut),
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sizeof(UCHAR));
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}
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except (EXCEPTION_EXECUTE_HANDLER)
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{
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status = GetExceptionCode();
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WARNPRINT(("Invalid SMBRequest buffer (status=%x,Buff=%p).\n",
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status, SmbReqOut));
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}
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if (NT_SUCCESS(status))
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{
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status = SMBRequest(devext, SmbReqIn);
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if (NT_SUCCESS(status))
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{
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RtlCopyMemory(SmbReqOut,
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SmbReqIn,
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sizeof(*SmbReqOut));
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Irp->IoStatus.Information = sizeof(*SmbReqOut);
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}
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}
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}
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break;
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#endif
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default:
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WARNPRINT(("unsupported ioctl code (ioctl=%s)\n",
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LookupName(irpsp->Parameters.DeviceIoControl.IoControlCode,
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IoctlNames)));
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status = STATUS_NOT_SUPPORTED;
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break;
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}
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IoReleaseRemoveLock(&devext->RemoveLock, Irp);
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}
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Irp->IoStatus.Status = status;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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EXIT(1, ("=%x\n", status));
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return status;
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} //SmbLiteIoctl
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/*++
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@doc INTERNAL
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@func NTSTATUS | GetBackLightBrightness |
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Query the Backlight brightness via the SMBus driver.
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@parm IN PSMBLITE_DEVEXT | devext | Points to the device extension.
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@parm OUT PSMBLITE_BRIGHTNESS | Brightness | To hold the brightness value.
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@rvalue Always returns STATUS_SUCCESS
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--*/
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NTSTATUS INTERNAL
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GetBackLightBrightness(
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IN PSMBLITE_DEVEXT devext,
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OUT PSMBLITE_BRIGHTNESS Brightness
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)
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{
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PROCNAME("GetBackLightBrightness")
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PAGED_CODE();
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ENTER(2, ("(devext=%p,Brightness=%p)\n", devext, Brightness));
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*Brightness = devext->BackLightBrightness;
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EXIT(2, ("=%x (ACValue=%d,DCValue=%d)\n",
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STATUS_SUCCESS, Brightness->bACValue, Brightness->bDCValue));
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return STATUS_SUCCESS;
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} //GetBackLightBrightness
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/*++
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@doc INTERNAL
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@func NTSTATUS | SetBackLightBrightness |
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Set the Backlight brightness via the SMBus driver.
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@parm IN PSMBLITE_DEVEXT | devext | Points to the device extension.
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@parm IN PSMBLITE_BRIGHTNESS | Brightness | The backlight brightness
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values.
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@parm IN BOOL | fSaveSettings | TRUE if need to save setting in the
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registry.
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@rvalue SUCCESS | returns STATUS_SUCCESS
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@rvalue FAILURE | returns NT status code
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--*/
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NTSTATUS INTERNAL
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SetBackLightBrightness(
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IN PSMBLITE_DEVEXT devext,
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IN PSMBLITE_BRIGHTNESS Brightness,
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IN BOOLEAN fSaveSettings
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)
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{
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PROCNAME("SetBackLightBrightness")
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NTSTATUS status;
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SMB_REQUEST SmbReq;
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UCHAR bBrightness;
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ENTER(2, ("(devext=%p,Brightness=%p,fSave=%x,ACValue=%d,DCValue=%d)\n",
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devext, Brightness, fSaveSettings, Brightness->bACValue,
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Brightness->bDCValue));
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//
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// Note: this routine must not be pageable because it could be called
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// by PowerStateCallbackProc which could be called at DPC.
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//
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bBrightness = (devext->dwfSmbLite & SMBLITEF_SYSTEM_ON_AC)?
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Brightness->bACValue: Brightness->bDCValue;
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DBGPRINT(1, ("Set Brightness level=%d (%s).\n",
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bBrightness,
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(devext->dwfSmbLite & SMBLITEF_SYSTEM_ON_AC)? "AC": "DC"));
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SmbReq.Protocol = SMB_WRITE_BYTE;
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SmbReq.Address = SMBADDR_BACKLIGHT;
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SmbReq.Command = SMBCMD_BACKLIGHT_NORMAL;
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SmbReq.Data[0] = (UCHAR)(bBrightness << 2);
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status = SMBRequest(devext, &SmbReq);
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if (NT_SUCCESS(status))
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{
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devext->BackLightBrightness = *Brightness;
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if (fSaveSettings)
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{
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RegSetDeviceParam(devext->PDO,
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gcwstrACBrightness,
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&Brightness->bACValue,
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sizeof(Brightness->bACValue));
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RegSetDeviceParam(devext->PDO,
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gcwstrDCBrightness,
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&Brightness->bDCValue,
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sizeof(Brightness->bDCValue));
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}
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}
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EXIT(2, ("=%x\n", status));
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return status;
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} //SetBackLightBrightness
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/*++
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@doc INTERNAL
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@func NTSTATUS | SMBRequest |
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Make a request to the SMBus driver.
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@parm IN PSMBLITE_DEVEXT | devext | Points to the device extension.
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@parm IN OUT PSMB_REQUEST | SmbReq | Points to the SMB request.
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@rvalue SUCCESS | returns STATUS_SUCCESS
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@rvalue FAILURE | returns NT status code
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--*/
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NTSTATUS INTERNAL
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SMBRequest(
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IN PSMBLITE_DEVEXT devext,
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IN OUT PSMB_REQUEST SmbReq
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)
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{
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PROCNAME("SMBRequest")
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NTSTATUS status;
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PIRP irp;
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KEVENT Event;
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IO_STATUS_BLOCK iosb;
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ENTER(2, ("(devext=%p,Req=%p,Protocol=%s,Addr=%x,Cmd=%x,Data0=%x,Data1=%x)\n",
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devext, SmbReq, LookupName(SmbReq->Protocol, ProtocolNames),
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SmbReq->Address, SmbReq->Command, SmbReq->Data[0],
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SmbReq->Data[1]));
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//
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// Note: this routine must not be pageable because it could be called
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// by SetBackLightBrightness and then PowerStateCallbackProc which could
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// be called at DPC.
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//
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KeInitializeEvent(&Event, NotificationEvent, FALSE);
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irp = IoBuildDeviceIoControlRequest(SMB_BUS_REQUEST,
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devext->LowerDevice,
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SmbReq,
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sizeof(SMB_REQUEST),
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NULL,
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0,
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TRUE,
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&Event,
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&iosb);
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if (irp != NULL)
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{
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status = IoCallDriver(devext->LowerDevice, irp);
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if (status == STATUS_PENDING)
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{
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KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
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status = iosb.Status;
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}
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if (!NT_SUCCESS(status))
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{
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ERRPRINT(("failed SMB request ioctl (status=%x).\n", status));
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}
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}
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else
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{
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ERRPRINT(("failed to build smb request ioctl request.\n"));
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status = STATUS_INSUFFICIENT_RESOURCES;
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}
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EXIT(2, ("=%x\n", status));
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return status;
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} //SMBRequest
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/*++
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@doc INTERNAL
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@func NTSTATUS | RegQueryDeviceParam | Query the registry for a device
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parameter.
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@parm IN PDEVICE_OBJECT | DevObj | Points to the device object.
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|
|
@parm IN PCWSTR | pwstrParamName | Points to the param name string.
|
||
|
|
@parm OUT PVOID | pbBuff | Points to the buffer to hold the result.
|
||
|
|
@parm IN ULONG | dwcbLen | Specifies the length of the buffer.
|
||
|
|
|
||
|
|
@rvalue SUCCESS | Returns STATUS_SUCCESS
|
||
|
|
@rvalue FAILURE | Returns NT status code
|
||
|
|
--*/
|
||
|
|
|
||
|
|
NTSTATUS INTERNAL
|
||
|
|
RegQueryDeviceParam(
|
||
|
|
IN PDEVICE_OBJECT DevObj,
|
||
|
|
IN PCWSTR pwstrParamName,
|
||
|
|
OUT PVOID pbBuff,
|
||
|
|
IN ULONG dwcbLen
|
||
|
|
)
|
||
|
|
{
|
||
|
|
PROCNAME("RegQueryDeviceParam")
|
||
|
|
NTSTATUS status;
|
||
|
|
ULONG dwSize;
|
||
|
|
PKEY_VALUE_PARTIAL_INFORMATION ValueInfo;
|
||
|
|
|
||
|
|
PAGED_CODE();
|
||
|
|
ENTER(2, ("(DevObj=%p,ParamName=%S,pbBuff=%p,Len=%d)\n",
|
||
|
|
DevObj, pwstrParamName, pbBuff, dwcbLen));
|
||
|
|
|
||
|
|
dwSize = FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data) + dwcbLen;
|
||
|
|
ValueInfo = (PKEY_VALUE_PARTIAL_INFORMATION)ExAllocatePoolWithTag(
|
||
|
|
NonPagedPool,
|
||
|
|
dwSize,
|
||
|
|
SMBLITE_POOLTAG);
|
||
|
|
if (ValueInfo != NULL)
|
||
|
|
{
|
||
|
|
HANDLE hkey;
|
||
|
|
|
||
|
|
status = IoOpenDeviceRegistryKey(DevObj,
|
||
|
|
PLUGPLAY_REGKEY_DEVICE,
|
||
|
|
STANDARD_RIGHTS_READ,
|
||
|
|
&hkey);
|
||
|
|
if (NT_SUCCESS(status))
|
||
|
|
{
|
||
|
|
UNICODE_STRING ucKeyName;
|
||
|
|
|
||
|
|
RtlInitUnicodeString(&ucKeyName, pwstrParamName);
|
||
|
|
status = ZwQueryValueKey(hkey,
|
||
|
|
&ucKeyName,
|
||
|
|
KeyValuePartialInformation,
|
||
|
|
ValueInfo,
|
||
|
|
dwSize,
|
||
|
|
&dwSize);
|
||
|
|
if (NT_SUCCESS(status))
|
||
|
|
{
|
||
|
|
ASSERT(ValueInfo->DataLength == dwcbLen);
|
||
|
|
RtlCopyMemory(pbBuff, ValueInfo->Data, dwcbLen);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
WARNPRINT(("failed to read parameter %S (status=%x)\n",
|
||
|
|
pwstrParamName, status));
|
||
|
|
}
|
||
|
|
|
||
|
|
ZwClose(hkey);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ERRPRINT(("failed to open device registry key (status=%x)\n",
|
||
|
|
status));
|
||
|
|
}
|
||
|
|
|
||
|
|
ExFreePool(ValueInfo);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
status = STATUS_INSUFFICIENT_RESOURCES;
|
||
|
|
ERRPRINT(("failed to allocate registry value buffer (size=%d)\n",
|
||
|
|
dwSize));
|
||
|
|
}
|
||
|
|
|
||
|
|
EXIT(2, ("=%x\n", status));
|
||
|
|
return status;
|
||
|
|
} //RegQueryDeviceParam
|
||
|
|
|
||
|
|
/*++
|
||
|
|
@doc INTERNAL
|
||
|
|
|
||
|
|
@func NTSTATUS | RegSetDeviceParam | Set a device parameter into the
|
||
|
|
registry.
|
||
|
|
|
||
|
|
@parm IN PDEVICE_OBJECT | DevObj | Points to the device object.
|
||
|
|
@parm IN PCWSTR | pwstrParamName | Points to the param name string.
|
||
|
|
@parm IN PVOID | pbBuff | Points to the buffer containing data.
|
||
|
|
@parm IN ULONG | dwcbLen | Specifies the length of the buffer.
|
||
|
|
|
||
|
|
@rvalue SUCCESS | Returns STATUS_SUCCESS
|
||
|
|
@rvalue FAILURE | Returns NT status code
|
||
|
|
--*/
|
||
|
|
|
||
|
|
NTSTATUS INTERNAL
|
||
|
|
RegSetDeviceParam(
|
||
|
|
IN PDEVICE_OBJECT DevObj,
|
||
|
|
IN PCWSTR pwstrParamName,
|
||
|
|
IN PVOID pbBuff,
|
||
|
|
IN ULONG dwcbLen
|
||
|
|
)
|
||
|
|
{
|
||
|
|
PROCNAME("RegSetDeviceParam")
|
||
|
|
NTSTATUS status;
|
||
|
|
HANDLE hkey;
|
||
|
|
|
||
|
|
ENTER(2, ("(DevObj=%p,ParamName=%S,pbBuff=%p,Len=%d)\n",
|
||
|
|
DevObj, pwstrParamName, pbBuff, dwcbLen));
|
||
|
|
|
||
|
|
//
|
||
|
|
// Note: this routine must not be pageable because it could be called
|
||
|
|
// by SetBackLightBrightness and then PowerStateCallbackProc which could
|
||
|
|
// be called at DPC.
|
||
|
|
//
|
||
|
|
status = IoOpenDeviceRegistryKey(DevObj,
|
||
|
|
PLUGPLAY_REGKEY_DEVICE,
|
||
|
|
STANDARD_RIGHTS_WRITE,
|
||
|
|
&hkey);
|
||
|
|
if (NT_SUCCESS(status))
|
||
|
|
{
|
||
|
|
UNICODE_STRING ucKeyName;
|
||
|
|
|
||
|
|
RtlInitUnicodeString(&ucKeyName, pwstrParamName);
|
||
|
|
status = ZwSetValueKey(hkey,
|
||
|
|
&ucKeyName,
|
||
|
|
0,
|
||
|
|
REG_BINARY,
|
||
|
|
pbBuff,
|
||
|
|
dwcbLen);
|
||
|
|
if (!NT_SUCCESS(status))
|
||
|
|
{
|
||
|
|
WARNPRINT(("failed to write device parameter %S (status=%x)\n",
|
||
|
|
pwstrParamName, status));
|
||
|
|
}
|
||
|
|
|
||
|
|
ZwClose(hkey);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ERRPRINT(("failed to open device registry key (status=%x)\n",
|
||
|
|
status));
|
||
|
|
}
|
||
|
|
|
||
|
|
EXIT(2, ("=%x\n", status));
|
||
|
|
return status;
|
||
|
|
} //RegSetDeviceParam
|