ASoC: SDCA: Move SDCA search functions and export

The ASoC code for SDCA contains several helper functions that search for
controls/ranges/etc. As the code evolves these helpers are likely to be
useful to anything interacting with the stored DisCo data. Move the
helpers into sdca_function.c and export them so other modules can also
use them.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250707124155.2596744-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 74 insertions, 60 deletions

diff --git a/include/sound/sdca_function.h b/include/sound/sdca_function.h
index b4a97ff08729..543c09e99ab1 100644
--- a/include/sound/sdca_function.h
+++ b/include/sound/sdca_function.h
@@ -1316,4 +1316,15 @@ int sdca_parse_function(struct device *dev,
 			struct sdca_function_desc *desc,
 			struct sdca_function_data *function);
 
+struct sdca_control *sdca_selector_find_control(struct device *dev,
+						struct sdca_entity *entity,
+						const int sel);
+struct sdca_control_range *sdca_control_find_range(struct device *dev,
+						   struct sdca_entity *entity,
+						   struct sdca_control *control,
+						   int cols, int rows);
+struct sdca_control_range *sdca_selector_find_range(struct device *dev,
+						    struct sdca_entity *entity,
+						    int sel, int cols, int rows);
+
 #endif
diff --git a/sound/soc/sdca/sdca_asoc.c b/sound/soc/sdca/sdca_asoc.c
index dd7b19083c85..11c9b3b935fc 100644
--- a/sound/soc/sdca/sdca_asoc.c
+++ b/sound/soc/sdca/sdca_asoc.c
@@ -26,53 +26,6 @@
 #include <sound/soc-dapm.h>
 #include <sound/tlv.h>
 
-static struct sdca_control *selector_find_control(struct device *dev,
-						  struct sdca_entity *entity,
-						  const int sel)
-{
-	int i;
-
-	for (i = 0; i < entity->num_controls; i++) {
-		struct sdca_control *control = &entity->controls[i];
-
-		if (control->sel == sel)
-			return control;
-	}
-
-	dev_err(dev, "%s: control %#x: missing\n", entity->label, sel);
-	return NULL;
-}
-
-static struct sdca_control_range *control_find_range(struct device *dev,
-						     struct sdca_entity *entity,
-						     struct sdca_control *control,
-						     int cols, int rows)
-{
-	struct sdca_control_range *range = &control->range;
-
-	if ((cols && range->cols != cols) || (rows && range->rows != rows) ||
-	    !range->data) {
-		dev_err(dev, "%s: control %#x: ranges invalid (%d,%d)\n",
-			entity->label, control->sel, range->cols, range->rows);
-		return NULL;
-	}
-
-	return range;
-}
-
-static struct sdca_control_range *selector_find_range(struct device *dev,
-						      struct sdca_entity *entity,
-						      int sel, int cols, int rows)
-{
-	struct sdca_control *control;
-
-	control = selector_find_control(dev, entity, sel);
-	if (!control)
-		return NULL;
-
-	return control_find_range(dev, entity, control, cols, rows);
-}
-
 static bool exported_control(struct sdca_entity *entity, struct sdca_control *control)
 {
 	switch (SDCA_CTL_TYPE(entity->type, control->sel)) {
@@ -213,7 +166,7 @@ static int entity_early_parse_ge(struct device *dev,
 	const char **texts;
 	int i;
 
-	control = selector_find_control(dev, entity, SDCA_CTL_GE_SELECTED_MODE);
+	control = sdca_selector_find_control(dev, entity, SDCA_CTL_GE_SELECTED_MODE);
 	if (!control)
 		return -EINVAL;
 
@@ -221,7 +174,7 @@ static int entity_early_parse_ge(struct device *dev,
 		dev_warn(dev, "%s: unexpected access layer: %x\n",
 			 entity->label, control->layers);
 
-	range = control_find_range(dev, entity, control, SDCA_SELECTED_MODE_NCOLS, 0);
+	range = sdca_control_find_range(dev, entity, control, SDCA_SELECTED_MODE_NCOLS, 0);
 	if (!range)
 		return -EINVAL;
 
@@ -443,7 +396,7 @@ static int entity_parse_pde(struct device *dev,
 	unsigned int mask = 0;
 	int i;
 
-	control = selector_find_control(dev, entity, SDCA_CTL_PDE_REQUESTED_PS);
+	control = sdca_selector_find_control(dev, entity, SDCA_CTL_PDE_REQUESTED_PS);
 	if (!control)
 		return -EINVAL;
 
@@ -452,7 +405,7 @@ static int entity_parse_pde(struct device *dev,
 		dev_warn(dev, "%s: unexpected access layer: %x\n",
 			 entity->label, control->layers);
 
-	range = control_find_range(dev, entity, control, SDCA_REQUESTED_PS_NCOLS, 0);
+	range = sdca_control_find_range(dev, entity, control, SDCA_REQUESTED_PS_NCOLS, 0);
 	if (!range)
 		return -EINVAL;
 
@@ -499,8 +452,8 @@ static int entity_parse_su_device(struct device *dev,
 		return -EINVAL;
 	}
 
-	range = selector_find_range(dev, entity->group, SDCA_CTL_GE_SELECTED_MODE,
-				    SDCA_SELECTED_MODE_NCOLS, 0);
+	range = sdca_selector_find_range(dev, entity->group, SDCA_CTL_GE_SELECTED_MODE,
+					 SDCA_SELECTED_MODE_NCOLS, 0);
 	if (!range)
 		return -EINVAL;
 
@@ -613,7 +566,7 @@ static int entity_parse_su(struct device *dev,
 		return -EINVAL;
 	}
 
-	control = selector_find_control(dev, entity, SDCA_CTL_SU_SELECTOR);
+	control = sdca_selector_find_control(dev, entity, SDCA_CTL_SU_SELECTOR);
 	if (!control)
 		return -EINVAL;
 
@@ -643,7 +596,7 @@ static int entity_parse_mu(struct device *dev,
 		return -EINVAL;
 	}
 
-	control = selector_find_control(dev, entity, SDCA_CTL_MU_MIXER);
+	control = sdca_selector_find_control(dev, entity, SDCA_CTL_MU_MIXER);
 	if (!control)
 		return -EINVAL;
 
@@ -853,7 +806,7 @@ static int control_limit_kctl(struct device *dev,
 	/*
 	 * FIXME: For now only handle the simple case of a single linear range
 	 */
-	range = control_find_range(dev, entity, control, SDCA_VOLUME_LINEAR_NCOLS, 1);
+	range = sdca_control_find_range(dev, entity, control, SDCA_VOLUME_LINEAR_NCOLS, 1);
 	if (!range)
 		return -EINVAL;
 
@@ -1140,9 +1093,9 @@ static int populate_rate_format(struct device *dev,
 	}
 
 	if (entity->iot.clock) {
-		range = selector_find_range(dev, entity->iot.clock,
-					    SDCA_CTL_CS_SAMPLERATEINDEX,
-					    SDCA_SAMPLERATEINDEX_NCOLS, 0);
+		range = sdca_selector_find_range(dev, entity->iot.clock,
+						 SDCA_CTL_CS_SAMPLERATEINDEX,
+						 SDCA_SAMPLERATEINDEX_NCOLS, 0);
 		if (!range)
 			return -EINVAL;
 
@@ -1154,7 +1107,7 @@ static int populate_rate_format(struct device *dev,
 		clock_rates = UINT_MAX;
 	}
 
-	range = selector_find_range(dev, entity, sel, SDCA_USAGE_NCOLS, 0);
+	range = sdca_selector_find_range(dev, entity, sel, SDCA_USAGE_NCOLS, 0);
 	if (!range)
 		return -EINVAL;
 
diff --git a/sound/soc/sdca/sdca_functions.c b/sound/soc/sdca/sdca_functions.c
index e567e364dc31..d2e2c8d10b92 100644
--- a/sound/soc/sdca/sdca_functions.c
+++ b/sound/soc/sdca/sdca_functions.c
@@ -1941,5 +1941,55 @@ int sdca_parse_function(struct device *dev,
 }
 EXPORT_SYMBOL_NS(sdca_parse_function, "SND_SOC_SDCA");
 
+struct sdca_control *sdca_selector_find_control(struct device *dev,
+						struct sdca_entity *entity,
+						const int sel)
+{
+	int i;
+
+	for (i = 0; i < entity->num_controls; i++) {
+		struct sdca_control *control = &entity->controls[i];
+
+		if (control->sel == sel)
+			return control;
+	}
+
+	dev_err(dev, "%s: control %#x: missing\n", entity->label, sel);
+	return NULL;
+}
+EXPORT_SYMBOL_NS(sdca_selector_find_control, "SND_SOC_SDCA");
+
+struct sdca_control_range *sdca_control_find_range(struct device *dev,
+						   struct sdca_entity *entity,
+						   struct sdca_control *control,
+						   int cols, int rows)
+{
+	struct sdca_control_range *range = &control->range;
+
+	if ((cols && range->cols != cols) || (rows && range->rows != rows) ||
+	    !range->data) {
+		dev_err(dev, "%s: control %#x: ranges invalid (%d,%d)\n",
+			entity->label, control->sel, range->cols, range->rows);
+		return NULL;
+	}
+
+	return range;
+}
+EXPORT_SYMBOL_NS(sdca_control_find_range, "SND_SOC_SDCA");
+
+struct sdca_control_range *sdca_selector_find_range(struct device *dev,
+						    struct sdca_entity *entity,
+						    int sel, int cols, int rows)
+{
+	struct sdca_control *control;
+
+	control = sdca_selector_find_control(dev, entity, sel);
+	if (!control)
+		return NULL;
+
+	return sdca_control_find_range(dev, entity, control, cols, rows);
+}
+EXPORT_SYMBOL_NS(sdca_selector_find_range, "SND_SOC_SDCA");
+
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("SDCA library");