[PATCH v3 4/8] ASoC: SDCA: add class_ops with populate_function

[Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>]

Add struct sdca_class_ops with a populate_function callback that lets
codec drivers supply the SDCA topology (entities, clusters,
init_table, ...) from static tables in place of sdca_parse_function()
on DT/non-DisCo platforms. The callback is a pure data source and
performs no bus I/O.

Codec drivers embed sdca_class_drv in their own priv and register
their populate_function through class_ops passed to
sdca_class_probe().

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
---
 include/sound/sdca_class.h           | 18 +++++++++++++++++-
 sound/soc/sdca/sdca_class.c          |  9 +++++++--
 sound/soc/sdca/sdca_class_function.c |  9 ++++++++-
 3 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/include/sound/sdca_class.h b/include/sound/sdca_class.h
index 9e6b0eab8a0e..90af5b914ba3 100644
--- a/include/sound/sdca_class.h
+++ b/include/sound/sdca_class.h
@@ -20,6 +20,18 @@ struct regmap;
 struct sdw_slave;
 struct sdca_function_data;
 
+/**
+ * struct sdca_class_ops - optional codec-provided class callbacks
+ * @populate_function: fill @function (entities, clusters, init_table, ...)
+ *           from static tables in place of sdca_parse_function() on
+ *           DT/non-DisCo platforms.  Pure data source; performs no
+ *           bus I/O.  Return 0 on success or a negative errno.
+ */
+struct sdca_class_ops {
+	int (*populate_function)(struct sdw_slave *slave,
+				 struct sdca_function_data *function);
+};
+
 struct sdca_class_drv {
 	struct device *dev;
 	struct regmap *dev_regmap;
@@ -27,6 +39,8 @@ struct sdca_class_drv {
 
 	struct sdca_interrupt_info *irq_info;
 
+	const struct sdca_class_ops *ops;
+
 	struct mutex regmap_lock;
 	/* Serialise function initialisations */
 	struct mutex init_lock;
@@ -34,7 +48,9 @@ struct sdca_class_drv {
 };
 
 /* Library helpers used by codec-specific SDCA SoundWire drivers. */
-int sdca_class_probe(struct sdw_slave *sdw, struct sdca_class_drv *drv);
+int sdca_class_probe(struct sdw_slave *sdw,
+		     struct sdca_class_drv *drv,
+		     const struct sdca_class_ops *ops);
 void sdca_class_remove(struct sdca_class_drv *drv);
 
 /*
diff --git a/sound/soc/sdca/sdca_class.c b/sound/soc/sdca/sdca_class.c
index 0e6dead41495..79fdb672be1d 100644
--- a/sound/soc/sdca/sdca_class.c
+++ b/sound/soc/sdca/sdca_class.c
@@ -144,6 +144,8 @@ static void class_boot_work(struct work_struct *work)
  *       allocation and sets its own dev_set_drvdata() -- the framework
  *       does not touch drvdata.  Typically embedded in the codec's own
  *       priv struct so codec drivers can keep per-slave state.
+ * @ops: optional codec-provided class callbacks (may be NULL for
+ *       pure-generic SDCA parts that need no quirks)
  *
  * Codec-specific SoundWire drivers call this from their .probe after
  * allocating a struct sdca_class_drv (usually embedded in their own
@@ -151,7 +153,9 @@ static void class_boot_work(struct work_struct *work)
  * sdca_class_drv fields, sets up the class regmap, and queues the
  * deferred boot work.
  */
-int sdca_class_probe(struct sdw_slave *sdw, struct sdca_class_drv *drv)
+int sdca_class_probe(struct sdw_slave *sdw,
+		     struct sdca_class_drv *drv,
+		     const struct sdca_class_ops *ops)
 {
 	struct device *dev = &sdw->dev;
 	struct regmap_config *dev_config;
@@ -169,6 +173,7 @@ int sdca_class_probe(struct sdw_slave *sdw, struct sdca_class_drv *drv)
 
 	drv->dev = dev;
 	drv->sdw = sdw;
+	drv->ops = ops;
 	mutex_init(&drv->regmap_lock);
 	mutex_init(&drv->init_lock);
 
@@ -213,7 +218,7 @@ static int class_sdw_probe(struct sdw_slave *sdw, const struct sdw_device_id *id
 
 	dev_set_drvdata(&sdw->dev, drv);
 
-	return sdca_class_probe(sdw, drv);
+	return sdca_class_probe(sdw, drv, NULL);
 }
 
 /**
diff --git a/sound/soc/sdca/sdca_class_function.c b/sound/soc/sdca/sdca_class_function.c
index 411e3d717bb6..d83be8474e7b 100644
--- a/sound/soc/sdca/sdca_class_function.c
+++ b/sound/soc/sdca/sdca_class_function.c
@@ -329,7 +329,14 @@ static int class_function_probe(struct auxiliary_device *auxdev,
 	drv->core = core;
 	drv->function = &sdev->function;
 
-	ret = sdca_parse_function(dev, drv->function);
+	if (core->ops && core->ops->populate_function) {
+		ret = core->ops->populate_function(core->sdw, drv->function);
+	} else if (drv->function->desc->node) {
+		ret = sdca_parse_function(dev, drv->function);
+	} else {
+		dev_err(dev, "no firmware node and no populate_function hook\n");
+		return -ENOENT;
+	}
 	if (ret)
 		return ret;
 
-- 
2.53.0