ASoC: Add support for event listener from the codec

During low power island mode, register to event listener
to process soundwire inband interrupts from the soundwire
master driver.

Change-Id: Ib15f5ec59ea19010dbb8f9744de76bfc2ca7eebb
Signed-off-by: Sudheer Papothi <[email protected]>

asoc/codecs/bolero/bolero-cdc.c

@@ -504,6 +504,8 @@ int bolero_register_macro(struct device *dev, u16 macro_id,
 	if (macro_id == TX_MACRO) {
 		priv->macro_params[macro_id].reg_wake_irq = ops->reg_wake_irq;
 		priv->macro_params[macro_id].clk_switch = ops->clk_switch;
+		priv->macro_params[macro_id].reg_evt_listener =
+							ops->reg_evt_listener;
 	}
 
 	priv->num_dais += ops->num_dais;
@@ -567,6 +569,7 @@ void bolero_unregister_macro(struct device *dev, u16 macro_id)
 	if (macro_id == TX_MACRO) {
 		priv->macro_params[macro_id].reg_wake_irq = NULL;
 		priv->macro_params[macro_id].clk_switch = NULL;
+		priv->macro_params[macro_id].reg_evt_listener = NULL;
 	}
 
 	priv->num_dais -= priv->macro_params[macro_id].num_dais;
@@ -803,6 +806,41 @@ int bolero_tx_clk_switch(struct snd_soc_component *component)
 }
 EXPORT_SYMBOL(bolero_tx_clk_switch);
 
+/**
+ * bolero_register_event_listener - Register/Deregister to event listener
+ *
+ * @component: pointer to codec component instance.
+ * @enable: when set to 1 registers to event listener otherwise, derigisters
+ *          from the event listener
+ *
+ * Returns 0 on success or -EINVAL on error.
+ */
+int bolero_register_event_listener(struct snd_soc_component *component,
+				   bool enable)
+{
+	struct bolero_priv *priv = NULL;
+	int ret = 0;
+
+	if (!component)
+		return -EINVAL;
+
+	priv = snd_soc_component_get_drvdata(component);
+	if (!priv)
+		return -EINVAL;
+
+	if (!bolero_is_valid_codec_dev(priv->dev)) {
+		dev_err(component->dev, "%s: invalid codec\n", __func__);
+		return -EINVAL;
+	}
+
+	if (priv->macro_params[TX_MACRO].reg_evt_listener)
+		ret = priv->macro_params[TX_MACRO].reg_evt_listener(component,
+								    enable);
+
+	return ret;
+}
+EXPORT_SYMBOL(bolero_register_event_listener);
+
 static int bolero_soc_codec_probe(struct snd_soc_component *component)
 {
 	struct bolero_priv *priv = dev_get_drvdata(component->dev);

asoc/codecs/bolero/bolero-cdc.h

@@ -56,6 +56,7 @@ struct macro_ops {
 	int (*set_port_map)(struct snd_soc_component *component, u32 uc,
 			    u32 size, void *data);
 	int (*clk_switch)(struct snd_soc_component *component);
+	int (*reg_evt_listener)(struct snd_soc_component *component, bool en);
 	char __iomem *io_base;
 	u16 clk_id_req;
 	u16 default_clk_id;
@@ -80,6 +81,8 @@ int bolero_runtime_resume(struct device *dev);
 int bolero_runtime_suspend(struct device *dev);
 int bolero_set_port_map(struct snd_soc_component *component, u32 size, void *data);
 int bolero_tx_clk_switch(struct snd_soc_component *component);
+int bolero_register_event_listener(struct snd_soc_component *component,
+				   bool enable);
 #else
 static inline int bolero_register_res_clk(struct device *dev, rsc_clk_cb_t cb)
 {
@@ -144,5 +147,12 @@ static inline int bolero_tx_clk_switch(struct snd_soc_component *component)
 	return 0;
 }
 
+static inline int bolero_register_event_listener(
+					struct snd_soc_component *component,
+					bool enable)
+{
+	return 0;
+}
+
 #endif /* CONFIG_SND_SOC_BOLERO */
 #endif /* BOLERO_CDC_H */

asoc/codecs/bolero/tx-macro.c

@@ -1582,6 +1582,42 @@ static const struct snd_kcontrol_new tx_macro_snd_controls[] = {
 		       tx_macro_get_bcs, tx_macro_set_bcs),
 };
 
+static int tx_macro_register_event_listener(struct snd_soc_component *component,
+					    bool enable)
+{
+	struct device *tx_dev = NULL;
+	struct tx_macro_priv *tx_priv = NULL;
+	int ret = 0;
+
+	if (!component)
+		return -EINVAL;
+
+	tx_dev = bolero_get_device_ptr(component->dev, TX_MACRO);
+	if (!tx_dev) {
+		dev_err(component->dev,
+			"%s: null device for macro!\n", __func__);
+		return -EINVAL;
+	}
+	tx_priv = dev_get_drvdata(tx_dev);
+	if (!tx_priv) {
+		dev_err(component->dev,
+			"%s: priv is null for macro!\n", __func__);
+		return -EINVAL;
+	}
+	if (tx_priv->swr_ctrl_data) {
+		if (enable)
+			ret = swrm_wcd_notify(
+				tx_priv->swr_ctrl_data[0].tx_swr_pdev,
+				SWR_REGISTER_WAKEUP, NULL);
+		else
+			ret = swrm_wcd_notify(
+				tx_priv->swr_ctrl_data[0].tx_swr_pdev,
+				SWR_DEREGISTER_WAKEUP, NULL);
+	}
+
+	return ret;
+}
+
 static int tx_macro_tx_va_mclk_enable(struct tx_macro_priv *tx_priv,
 				      struct regmap *regmap, int clk_type,
 				      bool enable)
@@ -2121,6 +2157,7 @@ static void tx_macro_init_ops(struct macro_ops *ops,
 	ops->reg_wake_irq = tx_macro_reg_wake_irq;
 	ops->set_port_map = tx_macro_set_port_map;
 	ops->clk_switch = tx_macro_clk_switch;
+	ops->reg_evt_listener = tx_macro_register_event_listener;
 }
 
 static int tx_macro_probe(struct platform_device *pdev)

asoc/codecs/bolero/va-macro.c

@@ -287,8 +287,10 @@ static int va_macro_swr_pwr_event(struct snd_soc_dapm_widget *w,
 			if (bolero_tx_clk_switch(component))
 				dev_dbg(va_dev, "%s: clock switch failed\n",
 					__func__);
+		bolero_register_event_listener(component, true);
 		break;
 	case SND_SOC_DAPM_POST_PMD:
+		bolero_register_event_listener(component, false);
 		if (bolero_tx_clk_switch(component))
 			dev_dbg(va_dev, "%s: clock switch failed\n",__func__);
 		if (va_priv->lpass_audio_hw_vote)