| # FIDL in drivers |
| |
| Caution: This page may contain information that is specific to the legacy |
| version of the driver framework (DFv1). |
| |
| A device may implement the `ddk::Messagable` mixin in order to be messaged by devfs |
| when a client tries to connect to the driver. A driver has to implement `ddk::Messagable` |
| with the specific [FIDL](/docs/development/languages/fidl/README.md) interface it would like |
| to speak. |
| |
| For example a driver implementing the |
| [`fuchsia_input_report::InputDevice`](/sdk/fidl/fuchsia.input.report/device.fidl) |
| interface might have a class definition like the following: |
| |
| ``` |
| class InputReportDriver; |
| using DriverDeviceType = ddk::Device<InputReportDriver, ddk::Unbindable, |
| ddk::Messageable<fuchsia_input_report::InputDevice>::Mixin>; |
| class InputReportDriver : public DriverDeviceType{ |
| // Implement the class methods here. |
| }; |
| ``` |
| |
| Clients that wish to speak to this device would open the relevant device file in |
| `/dev/class/input-report/` and begin sending FIDL messages. |
