ASoC: SOF: pcm: add .ack callback support

Add the indirections required at the core level for platform-specific
operations on ack.

Note that on errors in the .ack the ALSA core will restore the
previous appl_ptr.
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211119230852.206310-4-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ops.h

@@ -487,6 +487,16 @@ snd_sof_pcm_platform_pointer(struct snd_sof_dev *sdev,
 	return 0;
 }
 
+/* pcm ack */
+static inline int snd_sof_pcm_platform_ack(struct snd_sof_dev *sdev,
+					   struct snd_pcm_substream *substream)
+{
+	if (sof_ops(sdev) && sof_ops(sdev)->pcm_ack)
+		return sof_ops(sdev)->pcm_ack(sdev, substream);
+
+	return 0;
+}
+
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_PROBES)
 static inline int
 snd_sof_probe_compr_assign(struct snd_sof_dev *sdev,

sound/soc/sof/pcm.c

@@ -917,6 +917,14 @@ static void sof_pcm_remove(struct snd_soc_component *component)
 	snd_soc_tplg_component_remove(component);
 }
 
+static int sof_pcm_ack(struct snd_soc_component *component,
+		       struct snd_pcm_substream *substream)
+{
+	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
+
+	return snd_sof_pcm_platform_ack(sdev, substream);
+}
+
 void snd_sof_new_platform_drv(struct snd_sof_dev *sdev)
 {
 	struct snd_soc_component_driver *pd = &sdev->plat_drv;
@@ -935,6 +943,7 @@ void snd_sof_new_platform_drv(struct snd_sof_dev *sdev)
 	pd->hw_free = sof_pcm_hw_free;
 	pd->trigger = sof_pcm_trigger;
 	pd->pointer = sof_pcm_pointer;
+	pd->ack = sof_pcm_ack;
 
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_PROBES)
 	pd->compress_ops = &sof_probe_compressed_ops;

sound/soc/sof/sof-priv.h

@@ -207,6 +207,9 @@ struct snd_sof_dsp_ops {
 	snd_pcm_uframes_t (*pcm_pointer)(struct snd_sof_dev *sdev,
 					 struct snd_pcm_substream *substream); /* optional */
 
+	/* pcm ack */
+	int (*pcm_ack)(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream); /* optional */
+
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_PROBES)
 	/* Except for probe_pointer, all probe ops are mandatory */
 	int (*probe_assign)(struct snd_sof_dev *sdev,