ASoC: SOF: ipc4: Add definition for generic bytes control

Currently IPC4 only supports module specific custom bytes controls, where
each control's param_id is module specific.
These bytes controls cannot be handled in a generic way, there is no clean
way to support for example notifications from firmware when their data
has been changed.

Add definition for generic bytes control which should be handled in a
similar way as the enum/switch controls.

The generic param id for BYTES is selected to be 202

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/sof/ipc4-topology.h

@@ -365,19 +365,24 @@ struct sof_ipc4_control_data {
 
 #define SOF_IPC4_SWITCH_CONTROL_PARAM_ID	200
 #define SOF_IPC4_ENUM_CONTROL_PARAM_ID		201
+#define SOF_IPC4_BYTES_CONTROL_PARAM_ID		202
 
 /**
  * struct sof_ipc4_control_msg_payload - IPC payload for kcontrol parameters
  * @id: unique id of the control
- * @num_elems: Number of elements in the chanv array
+ * @num_elems: Number of elements in the chanv array or number of bytes in data
  * @reserved: reserved for future use, must be set to 0
  * @chanv: channel ID and value array
+ * @data: binary payload
  */
 struct sof_ipc4_control_msg_payload {
 	uint16_t id;
 	uint16_t num_elems;
 	uint32_t reserved[4];
-	DECLARE_FLEX_ARRAY(struct sof_ipc4_ctrl_value_chan, chanv);
+	union {
+		DECLARE_FLEX_ARRAY(struct sof_ipc4_ctrl_value_chan, chanv);
+		DECLARE_FLEX_ARRAY(uint8_t, data);
+	};
 } __packed;
 
 /**

sound/soc/sof/ipc4.c

@@ -446,6 +446,7 @@ static bool sof_ipc4_tx_payload_for_get_data(struct sof_ipc4_msg *tx)
 	switch (tx->extension & SOF_IPC4_MOD_EXT_MSG_PARAM_ID_MASK) {
 	case SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_SWITCH_CONTROL_PARAM_ID):
 	case SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_ENUM_CONTROL_PARAM_ID):
+	case SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_BYTES_CONTROL_PARAM_ID):
 		return true;
 	default:
 		return false;