Maxim Integrated 73M1866B/73M1966B Reference Driver - Manual (Page 67)

UG_1x66B_015 73M1866B/73M1966B Reference Driver User Guide
Rev. 2.7 67
6.9 Miscellaneous
6.9.1 M1966_THRESHOLD_OVERRIDE
Description
Various FXO channel parameters are conveniently grouped and predefined in the country parameter
setting as specified in Section 7.2. These parameters are programmed during channel initialization ioctl
(M1966_CH_INIT). However, these parameters can be overridden at runtime to fine tune to the desired
threshold for the specific installation using this M1966_THRESHOLD_OVERRIDE IOCTL.
Note: This IOCTL must be invoked after M1966_CH_INIT to prevent the parameter from over written by
M1966_CH_INIT
.
#define M1966_THRESHOLD_OVERRIDE _IOWR(0xA4,0xB3,unsigned int)
Prototype
int ioctl (
int chan_fd,
int M1966_THRESHOLD_OVERRIDE,
unsigned long param );
Parameters
Data Type Name Description
int chan_fd Channel descriptor.
int M1966_THRESHOLD_OVERRIDE I/O control identifier for this operation.
unsigned long param Pointer to structure
M1966_THRESH_OVERRIDE_t
.
Return Values
Data Type Description
int -EFAULT – Failed to perform threshold override.
0 – Successful.