The class driver sends an internal device control request to the port driver to enable the device. The class drivers must connect their class service to a device before the device can be opened. The class drivers connect their class service after they attach a class DO to a device stack. The function driver uses the class service callback to transfer input data from a device to the class data queue for the device.
The function driver's ISR dispatch completion routine for a device calls the class service callback. A vendor can modify the operation of a class service callback by installing an upper-level filter driver for a device. The sample filter service callbacks can be configured to modify the input data that is transferred from the port input buffer for a device to the class data queue. For example, the filter service callback can delete, transform, or insert data.
After the filter driver receives the connect request, it saves a copy of the class connect data, and replaces the request's connect data with filter connect data.
The filter connect data specifies a pointer to the filter device object and a pointer to the filter driver service callback. The filter driver then sends the filtered connect request to the function driver. The function driver uses the filter connect data to make the initial callback to the filter service callback. After filtering the input data, the filter service callback uses the class connect data that it saved to make a callback to the class service callback.
Iprt supports the following internal device control requests to query information about a keyboard device, and to set parameters on a keyboard device:.
For more information about all keyboard device control requests, see Human Interface Devices Reference. If a device produces an incorrect scan code for a certain key, the wrong virtual key message will be sent.
This can be fixed by writing a filter driver that analyzes the scan codes generated by firmware and modifies the incorrect scan code to one understood by the system. However, this is a tedious process and can sometimes lead to severe problems, if errors exist in the kernel-level filter driver. Windows and Windows XP include a new Scan Code Mapper, which provides a method that allows for mapping of scan codes. The scan code mappings for Windows are stored in the following registry key:.
Note There is also a Keyboard Layouts key notice the plural form under the Control key, but that key should not be modified. In the Keyboard Layout key, the Scancode Map value must be added. The third DWORD entry holds a count of the total number of mappings that follow, including the null terminating mapping. The minimum count would therefore be 1 no mappings specified.
The individual mappings follow the header. Each WORD field stores the scan code for a key to be mapped. Once the map is stored in the registry, the system must be rebooted for the mappings to take effect. Note that if the mapping of a scan code is necessary on a keypress, the step is performed in user mode just before the scan code is converted to a virtual key.
Doing this conversion in user mode can present certain limitations, such as mapping not working correctly when running under Terminal Services. The following presents an example. It is also possible to add a key not generally available on a keyboard or to remove a key that is never used. Iprt supports the following internal device control request to query information about a mouse device:.
For more information about all mouse device control requests, see Human Interface Devices Reference. In addition to dividing the device input value by the maximum capability of the device, the driver scales the device input value by 0xFFFF:. The following specifies, by type of device, how these special requirements for an absolute pointing device are implemented:. Mouhid, the Windows function driver for HID mouse devices, implements these special requirements automatically.
An upper-level filter driver is required. The filter driver supplies an IsrHook callback and a class service callback. Iprt calls the IsrHook to handle raw device input, and calls the filter class service callback to filter the input. The filter class service callback, in turn, calls MouseClassServiceCallback. A Plug and Play function driver is required. A device-specific function driver is required.
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