ASoC: Intel: avs: Data probing soc-component

Define stub component for data probing. Stub as most operations from
standard PCM case do not apply here. Specific bits are CPU DAIs and
compress_ops. FE DAIs can link against these new CPU DAI to create new
compress devices.
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20221202152841.672536-12-cezary.rojewski@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/avs/avs.h

@@ -322,6 +322,9 @@ struct avs_soc_component {
 
 extern const struct snd_soc_dai_ops avs_dai_fe_ops;
 
+int avs_soc_component_register(struct device *dev, const char *name,
+			       const struct snd_soc_component_driver *drv,
+			       struct snd_soc_dai_driver *cpu_dais, int num_cpu_dais);
 int avs_dmic_platform_register(struct avs_dev *adev, const char *name);
 int avs_i2s_platform_register(struct avs_dev *adev, const char *name, unsigned long port_mask,
 			      unsigned long *tdms);
@@ -373,6 +376,8 @@ struct apl_log_buffer_layout {
 bool avs_logging_fw(struct avs_dev *adev);
 void avs_dump_fw_log(struct avs_dev *adev, const void __iomem *src, unsigned int len);
 void avs_dump_fw_log_wakeup(struct avs_dev *adev, const void __iomem *src, unsigned int len);
+
+int avs_probe_platform_register(struct avs_dev *adev, const char *name);
 #else
 #define AVS_SET_ENABLE_LOGS_OP(name)
 
@@ -389,6 +394,11 @@ static inline void
 avs_dump_fw_log_wakeup(struct avs_dev *adev, const void __iomem *src, unsigned int len)
 {
 }
+
+static inline int avs_probe_platform_register(struct avs_dev *adev, const char *name)
+{
+	return 0;
+}
 #endif
 
 #endif /* __SOUND_SOC_INTEL_AVS_H */

sound/soc/intel/avs/pcm.c

@@ -1126,9 +1126,9 @@ static const struct snd_soc_component_driver avs_component_driver = {
 	.topology_name_prefix	= "intel/avs",
 };
 
-static int avs_soc_component_register(struct device *dev, const char *name,
-				      const struct snd_soc_component_driver *drv,
-				      struct snd_soc_dai_driver *cpu_dais, int num_cpu_dais)
+int avs_soc_component_register(struct device *dev, const char *name,
+			       const struct snd_soc_component_driver *drv,
+			       struct snd_soc_dai_driver *cpu_dais, int num_cpu_dais)
 {
 	struct avs_soc_component *acomp;
 	int ret;

sound/soc/intel/avs/probes.c

@@ -249,7 +249,6 @@ static int avs_probe_compr_copy(struct snd_soc_component *comp, struct snd_compr
 	return count;
 }
 
-__maybe_unused
 static const struct snd_soc_cdai_ops avs_probe_dai_ops = {
 	.startup = avs_probe_compr_open,
 	.shutdown = avs_probe_compr_free,
@@ -258,7 +257,57 @@ static const struct snd_soc_cdai_ops avs_probe_dai_ops = {
 	.pointer = avs_probe_compr_pointer,
 };
 
-__maybe_unused
 static const struct snd_compress_ops avs_probe_compress_ops = {
 	.copy = avs_probe_compr_copy,
 };
+
+static struct snd_soc_dai_driver probe_cpu_dais[] = {
+{
+	.name = "Probe Extraction CPU DAI",
+	.compress_new = snd_soc_new_compress,
+	.cops = &avs_probe_dai_ops,
+	.capture = {
+		.stream_name = "Probe Extraction",
+		.channels_min = 1,
+		.channels_max = 8,
+		.rates = SNDRV_PCM_RATE_48000,
+		.rate_min = 48000,
+		.rate_max = 48000,
+	},
+},
+};
+
+static int avs_probe_component_probe(struct snd_soc_component *component)
+{
+	struct avs_soc_component *acomp = to_avs_soc_component(component);
+	struct avs_dev *adev = to_avs_dev(component->dev);
+
+	mutex_lock(&adev->comp_list_mutex);
+	list_add_tail(&acomp->node, &adev->comp_list);
+	mutex_unlock(&adev->comp_list_mutex);
+	return 0;
+}
+
+static void avs_probe_component_remove(struct snd_soc_component *component)
+{
+	struct avs_soc_component *acomp = to_avs_soc_component(component);
+	struct avs_dev *adev = to_avs_dev(component->dev);
+
+	mutex_lock(&adev->comp_list_mutex);
+	list_del(&acomp->node);
+	mutex_unlock(&adev->comp_list_mutex);
+}
+
+static const struct snd_soc_component_driver avs_probe_component_driver = {
+	.name			= "avs-probe-compr",
+	.probe			= avs_probe_component_probe,
+	.remove			= avs_probe_component_remove,
+	.compress_ops		= &avs_probe_compress_ops,
+	.module_get_upon_open	= 1, /* increment refcount when a stream is opened */
+};
+
+int avs_probe_platform_register(struct avs_dev *adev, const char *name)
+{
+	return avs_soc_component_register(adev->dev, name, &avs_probe_component_driver,
+					  probe_cpu_dais, ARRAY_SIZE(probe_cpu_dais));
+}