1 files changed, 27 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_cirrus.c b/sound/pci/hda/patch_cirrus.c
index d9a3dbcc9ba0..460fb2ef7e39 100644
--- a/sound/pci/hda/patch_cirrus.c
+++ b/sound/pci/hda/patch_cirrus.c
@@ -742,6 +742,27 @@ static struct hda_bind_ctls *make_bind_capture(struct hda_codec *codec,
         return bind;
 }
 
+/* add a (input-boost) volume control to the given input pin */
+static int add_input_volume_control(struct hda_codec *codec,
+                                    struct auto_pin_cfg *cfg,
+                                    int item)
+{
+        hda_nid_t pin = cfg->inputs[item].pin;
+        u32 caps;
+        const char *label;
+        struct snd_kcontrol *kctl;
+                
+        if (!(get_wcaps(codec, pin) & AC_WCAP_IN_AMP))
+                return 0;
+        caps = query_amp_caps(codec, pin, HDA_INPUT);
+        caps = (caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
+        if (caps <= 1)
+                return 0;
+        label = hda_get_autocfg_input_label(codec, cfg, item);
+        return add_volume(codec, label, 0,
+                          HDA_COMPOSE_AMP_VAL(pin, 3, 0, HDA_INPUT), 1, &kctl);
+}
+
 static int build_input(struct hda_codec *codec)
 {
         struct cs_spec *spec = codec->spec;
@@ -781,6 +802,12 @@ static int build_input(struct hda_codec *codec)
                         return err;
         }
 
+        for (i = 0; i < spec->num_inputs; i++) {
+                err = add_input_volume_control(codec, &spec->autocfg, i);
+                if (err < 0)
+                        return err;
+        }
+
         return 0;
 }