ASoC: wm_adsp: Add a handler for the compressed IRQ

Here support is added for responding to DSP IRQs that are used to
indicate data being available on the DSP. The idea is that we check the
amount of data available upon receipt of an IRQ and on subsequent calls
to the pointer callback we recheck once less than one fragment is
available (to avoid excessive SPI traffic), if there is truely less than
one fragment available we ack the last IRQ and wait for a new one.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.h

@@ -112,5 +112,8 @@ extern int wm_adsp_compr_set_params(struct snd_compr_stream *stream,
 extern int wm_adsp_compr_get_caps(struct snd_compr_stream *stream,
 				  struct snd_compr_caps *caps);
 extern int wm_adsp_compr_trigger(struct snd_compr_stream *stream, int cmd);
+extern int wm_adsp_compr_handle_irq(struct wm_adsp *dsp);
+extern int wm_adsp_compr_pointer(struct snd_compr_stream *stream,
+				 struct snd_compr_tstamp *tstamp);
 
 #endif