struct usb_ctrlreque(9)
NAME
struct_usb_ctrlrequest - SETUP data for a USB device control request
SYNOPSIS
struct usb_ctrlrequest {
__u8 bRequestType;
__u8 bRequest;
__le16 wValue;
__le16 wIndex;
__le16 wLength;
};
MEMBERS
- bRequestType
- matches the USB bmRequestType field
- bRequest
- matches the USB bRequest field
- wValue
- matches the USB wValue field (le16 byte order)
- wIndex
- matches the USB wIndex field (le16 byte order)
- wLength
- matches the USB wLength field (le16 byte order)
DESCRIPTION
This structure is used to send control requests to a USB device. It
matches the different fields of the USB 2.0 Spec section 9.3, table
9-2. See the USB spec for a fuller description of the different fields,
and what they are used for.
Note that the driver for any interface can issue control requests. For
most devices, interfaces don´t coordinate with each other, so such
requests may be made at any time.