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8 loopback services, Loopback services, M1966_loopback – Maxim Integrated 73M1866B/73M1966B Reference Driver User Manual

Page 66: Section

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73M1866B/73M1966B Reference Driver User Guide

UG_1x66B_015

66

Rev. 2.7

6.8 Loopback Services

6.8.1 M1966_LOOPBACK

Description

This IOCTL is used for managing the loopback session – initiating, clearing or retrieving the status of
current active loopback session on a given channel. Only one loopback session can be active per
channel. For reading the status the loopback “mode” will be returned in the structure
M1966_LOOPBACK_

t pointed to by the “param” field.


#define M1966_LOOPBACK _IOWR(0xA4, 0xBD, unsigned int)

Prototype

int ioctl (

int chan_fd,

int M1966_LOOPBACK,

unsigned long param );


Parameters

Data Type

Name

Description

int

chan_fd

Channel descriptor.

int

M1966_LOOPBACK

I/O control identifier for this operation.

unsigned long param

Pointer to structure

M1966_LOOPBACK_

t.


Return Values

Data Type

Description

unsigned int

0 – Successful.
-FAULT – Failed to perform loopback request.