ASoC: SOF: ipc: ops: Add support for optional init and exit callbacks

Add support for IPC specific initialization (init) and cleanup (exit)
callback.

These callbacks can be used by IPC implementation to do basic
initialization and cleanup.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Chao Song <chao.song@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20221020121238.18339-8-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ipc.c

@@ -200,6 +200,9 @@ struct snd_sof_ipc *snd_sof_ipc_init(struct snd_sof_dev *sdev)
 		return NULL;
 	}
 
+	if (ops->init && ops->init(sdev))
+		return NULL;
+
 	ipc->ops = ops;
 
 	return ipc;
@@ -217,5 +220,8 @@ void snd_sof_ipc_free(struct snd_sof_dev *sdev)
 	mutex_lock(&ipc->tx_mutex);
 	ipc->disable_ipc_tx = true;
 	mutex_unlock(&ipc->tx_mutex);
+
+	if (ipc->ops->exit)
+		ipc->ops->exit(sdev);
 }
 EXPORT_SYMBOL(snd_sof_ipc_free);

sound/soc/sof/sof-priv.h

@@ -443,6 +443,9 @@ struct sof_ipc_pcm_ops;
  * @fw_loader:	Pointer to Firmware Loader ops
  * @fw_tracing:	Pointer to Firmware tracing ops
  *
+ * @init:	Optional pointer for IPC related initialization
+ * @exit:	Optional pointer for IPC related cleanup
+ *
  * @tx_msg:	Function pointer for sending a 'short' IPC message
  * @set_get_data: Function pointer for set/get data ('large' IPC message). This
  *		function may split up the 'large' message and use the @tx_msg
@@ -464,6 +467,9 @@ struct sof_ipc_ops {
 	const struct sof_ipc_fw_loader_ops *fw_loader;
 	const struct sof_ipc_fw_tracing_ops *fw_tracing;
 
+	int (*init)(struct snd_sof_dev *sdev);
+	void (*exit)(struct snd_sof_dev *sdev);
+
 	int (*tx_msg)(struct snd_sof_dev *sdev, void *msg_data, size_t msg_bytes,
 		      void *reply_data, size_t reply_bytes, bool no_pm);
 	int (*set_get_data)(struct snd_sof_dev *sdev, void *data, size_t data_bytes,