for audio input from modem... https://git.replicant.us/replicant/hardware_tinyalsa-audio/tree/audio_in.c

define a struct:

struct tinyalsa_audio_stream_in *stream_in

tinyalsa_audio_device = (struct tinyalsa_audio_device *) dev;

	if(tinyalsa_audio_device->mixer == NULL)
		goto error_stream;

	tinyalsa_audio_stream_in->mixer_props =
		tinyalsa_mixer_get_input_props(tinyalsa_audio_device->mixer);

stream_in->mixer_props->card should be set to int card number
stream_in->mixer_props->device should be set to int device number

call:

audio_in_pcm_open

you should now have:

stream_in->pcm

which you can pass to:

rx

use:

audio_in_pcm_close

to clean up

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for audio output from modem ...