interface: Introduce a method to test supported time stamping modes.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>

interface.c

@@ -47,3 +47,11 @@ bool interface_tsinfo_valid(struct interface *iface)
 {
 	return iface->ts_info.valid ? true : false;
 }
+
+bool interface_tsmodes_supported(struct interface *iface, int modes)
+{
+	if ((iface->ts_info.so_timestamping & modes) == modes) {
+		return true;
+	}
+	return false;
+}

interface.h

@@ -82,4 +82,12 @@ void interface_set_name(struct interface *iface, const char *name);
  */
 bool interface_tsinfo_valid(struct interface *iface);
 
+/**
+ * Tests whether an interface supports a set of given time stamping modes.
+ * @param iface  The interface of interest.
+ * @param modes  Bit mask of SOF_TIMESTAMPING_ flags.
+ * @return       True if the time stamping modes are supported, false otherwise.
+ */
+bool interface_tsmodes_supported(struct interface *iface, int modes);
+
 #endif