Function

void dahdi_alarm_channel (struct dahdi_chan * chan, int alarms)

Arguments

chan: the DAHDI channel
alarms: alarm bits set

Description

Notify userspace about a change in alarm status of this channel.
Note that channel drivers should only use this function directly if they have a single port per channel. Whole-span alarms should be sent using dahdi_alarm_notify .
Does nothing if alarms on the channel have not changed. If they have, triggers sending either DAHDI_EVENT_NOALARM (if they were cleared) or DAHDI_EVENT_ALARM (otherwise).
Currently it is only used by drivers of FXO ports to notify (with a red alarm) they have no battery current.

Function

int dahdi_register (struct dahdi_span * span, int prefmaster)

Arguments

span: the DAHDI span
prefmaster: will the new span be preffered as a master?

Description

Registers a span for usage with DAHDI. All the channel numbers in it will get the lowest available channel numbers.
If prefmaster is set to anything > 0, span will attempt to become the master DAHDI span at registration time. If 0: it will only become master if no other span is currently the master (i.e.: it is the first one).

Function

int dahdi_unregister (struct dahdi_span * span)

Arguments

span: the DAHDI span

Description

Unregisters a span that has been previously registered with dahdi_register.

Function

void dahdi_hooksig (struct dahdi_chan * chan, enum dahdi_rxsig rxsig)

Arguments

chan: the DAHDI channel
rxsig: signal (number) to send

Description

Called from a channel driver to send a DAHDI signal to userspace. The signal will be queued for delivery to userspace.
If the signal is the same as previous one sent, it won't be re-sent.

Function

void dahdi_rbsbits (struct dahdi_chan * chan, int cursig)

Arguments

chan: the DAHDI channel
cursig: the bits to set

Description

Set the channel's rxsig (recieved: from device to userspace) and act accordingly.

Function

void dahdi_ec_chunk (struct dahdi_chan * ss, unsigned char * rxchunk, const unsigned char * txchunk)

Arguments

ss: DAHDI channel
rxchunk: chunk of audio on which to cancel echo
txchunk: reference chunk from the other direction

Description

The echo canceller function fixes recieved (from device to userspace) audio. In order to fix it it uses the transmitted audio as a reference. This call updates the echo canceller for a single chunk (8 bytes).

Function

void dahdi_ec_span (struct dahdi_span * span)

Arguments

span: DAHDI span

Description

Similar to calling dahdi_ec_chunk for each of the channels in the span. Uses dahdi_chunk.write_chunk for the rxchunk (the chunk to fix) and dahdi_chan.readchunk as the txchunk (the reference chunk).