IOCTL_BIOMETRIC_UPDATE_FIRMWARE IOCTL (winbio_ioctl.h)
The IOCTL_BIOMETRIC_UPDATE_FIRMWARE IOCTL tells the driver to update the firmware for the device with the given firmware image. This IOCTL is optional.
Major code
Input buffer
Input buffer length
Length of a WINBIO_UPDATE_FIRMWARE structure.
Output buffer
The AssociatedIrp.SystemBuffer member points to a buffer that contains a WINBIO_BLANK_PAYLOAD structure.
Output buffer length
The smallest valid output buffer size is the size of DWORD. If the driver receives an DWORD-sized output buffer, the driver should return the buffer size necessary for the requested operation.
Status block
Indicates whether the DeviceIoControl call to the driver completed and the OUT payload is valid.
The Status member is set to one of the values in the following table.
| Status value | Description |
|---|---|
| S_OK, STATUS_SUCCESS | The operation completed successfully. If the size of data returned is DWORD, the payload contains the size of the buffer necessary for the call. Otherwise, the payload contains the full output buffer. |
| E_INVALIDARG | The parameters were not specified correctly. |
| E_UNKNOWN | Any other failure that prevents the payload from being filled in. |
| E_UNEXPECTED | Any other failure that prevents the payload from being filled in. |
| E_FAIL | Any other failure that prevents the payload from being filled in. |
Remarks
The firmware image is specific to each vendor and may contain both firmware data and any extra data that the driver needs to validate the image.
If the device has a different firmware update mechanism, the driver can return E_NOTIMPL for this IOCTL.
If the vendor-supplied driver passes back the entire payload, it should fill in the WinBioHresult member of WINBIO_BLANK_PAYLOAD with the status of the Biometric operation.
Possible values include:
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 7 and later versions of Windows. |
| Header | winbio_ioctl.h |