ASoC: Intel: sof_sdw: add dailink .trigger callback

Add trigger functionality to dailink, so far only .startup() and
.shutdown() were implemented at the machine driver level.

The companion patch for this patch is the removal of the trigger
callback at the DAI level in drivers/soundwire/intel.c

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200904182854.3944-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw.c

@@ -225,6 +225,46 @@ int sdw_startup(struct snd_pcm_substream *substream)
 	return sdw_startup_stream(substream);
 }
 
+static int sdw_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct sdw_stream_runtime *sdw_stream;
+	struct snd_soc_dai *dai;
+	int ret;
+
+	/* Find stream from first CPU DAI */
+	dai = asoc_rtd_to_cpu(rtd, 0);
+
+	sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
+
+	if (IS_ERR(sdw_stream)) {
+		dev_err(rtd->dev, "no stream found for DAI %s", dai->name);
+		return PTR_ERR(sdw_stream);
+	}
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		ret = sdw_enable_stream(sdw_stream);
+		break;
+
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
+		ret = sdw_disable_stream(sdw_stream);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret)
+		dev_err(rtd->dev, "%s trigger %d failed: %d", __func__, cmd, ret);
+
+	return ret;
+}
+
 void sdw_shutdown(struct snd_pcm_substream *substream)
 {
 	sdw_shutdown_stream(substream);
@@ -232,6 +272,7 @@ void sdw_shutdown(struct snd_pcm_substream *substream)
 
 static const struct snd_soc_ops sdw_ops = {
 	.startup = sdw_startup,
+	.trigger = sdw_trigger,
 	.shutdown = sdw_shutdown,
 };