Reference Driver

UG_1x66B_015 73M1866B/73M1966B Reference Driver User Guide
Rev. 2.7 39
6.2 Events and Status Service
The driver can be queried for a variety of current status of the FXO line via IOCTLs. Table 2 summarizes
these services.
Table 2: FXO Line Status Services
Events and Status Description Descriptor
M1966_RNG_GET
FXO line ring status commands. Channel
M1966_POL_GET
FXO line polarity status commands. Channel
M1966_BAT_GET
FXO line battery status command. Channel
M1966_POH_GET
FXO line POH status command. Channel
M1966_EVENT_GET
Event retrieval command. Device
M1966_ERROR_CODE_GET
Retrieve last error code command. Device/Channel
6.2.1 M1966_RNG_GET
Description
Gets the current ring status of the FXO line. The current ring status is maintained in the driver internal
variable. This variable is being retrieved by use application using this command.
#define M1966_RNG_GET _IOWR(0xA4,0xB8,unsigned int)
Prototype
int ioctl (
int chan_fd,
int M1966_RNG_GET,
unsigned long param );
Parameters
Data Type Name Description
int
chan_fd
Channel descriptor.
int
M1966_RNG_GET
I/O control identifier for this operation.
unsigned long
param
N/A.
Return Values
Data Type Description
int
The return value can be either of the following:
0 – No ring signal occurred on the FXO line.
1 – The FXO line is ringing, signaling of incoming call.