---
title: DeviceRequestTO
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbdeviceinterface942/2977142-devicerequestto
---

# DeviceRequestTO

## Declaration

```occ
IOReturn (*DeviceRequestTO)(void *self, IOUSBDevRequestTO *req);
```