for (i = 0; i < spec->private_imux.num_items; i++) {
                hda_nid_t pin = spec->imux_info[i].pin;
                unsigned int def_conf = snd_hda_codec_get_pincfg(codec, pin);
-               int attr;
-               if (get_defcfg_device(def_conf) != AC_JACK_MIC_IN)
-                       return; /* no-mic input */
+               int type, attr;
                attr = snd_hda_get_input_pin_attr(def_conf);
                if (attr == INPUT_PIN_ATTR_UNUSED)
-                       continue;
+                       return; /* invalid entry */
                if (attr > INPUT_PIN_ATTR_NORMAL)
                        attr = INPUT_PIN_ATTR_NORMAL;
                if (attr != INPUT_PIN_ATTR_INT &&
                    !is_jack_detectable(codec, pin))
-                       continue;
+                       return; /* non-detectable pin */
+               type = get_defcfg_device(def_conf);
+               if (type != AC_JACK_MIC_IN &&
+                   (attr != INPUT_PIN_ATTR_DOCK || type != AC_JACK_LINE_IN))
+                       return; /* no valid input type */
                if (pset[attr] >= 0)
                        return; /* already occupied */
                pset[attr] = i;