usb: chipidea: add query_available_role interface

The glue layer may need to know current available role to do some
setting, eg, the wakeup setting. So we add ci_hdrc_query_available_role
for that.
Signed-off-by: Peter Chen <peter.chen@nxp.com>

drivers/usb/chipidea/core.c

@@ -877,6 +877,33 @@ void ci_hdrc_remove_device(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 
+/**
+ * ci_hdrc_query_available_role: get runtime available operation mode
+ *
+ * The glue layer can get current operation mode (host/peripheral/otg)
+ * This function should be called after ci core device has created.
+ *
+ * @pdev: the platform device of ci core.
+ *
+ * Return runtime usb_dr_mode.
+ */
+enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
+{
+	struct ci_hdrc *ci = platform_get_drvdata(pdev);
+
+	if (!ci)
+		return USB_DR_MODE_UNKNOWN;
+	if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
+		return USB_DR_MODE_OTG;
+	else if (ci->roles[CI_ROLE_HOST])
+		return USB_DR_MODE_HOST;
+	else if (ci->roles[CI_ROLE_GADGET])
+		return USB_DR_MODE_PERIPHERAL;
+	else
+		return USB_DR_MODE_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
+
 static inline void ci_role_destroy(struct ci_hdrc *ci)
 {
 	ci_hdrc_gadget_destroy(ci);

include/linux/usb/chipidea.h

@@ -99,5 +99,7 @@ struct platform_device *ci_hdrc_add_device(struct device *dev,
 			struct ci_hdrc_platform_data *platdata);
 /* Remove ci hdrc device */
 void ci_hdrc_remove_device(struct platform_device *pdev);
+/* Get current available role */
+enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev);
 
 #endif