+/**
+ * cs4270_soc_put_mute - put callback for the 'Master Playback switch'
+ * alsa control.
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * This function basically passes the arguments on to the generic
+ * snd_soc_put_volsw() function and saves the mute information in
+ * our private data structure. This is because we want to prevent
+ * cs4270_dai_mute() neglecting the user's decision to manually
+ * mute the codec's output.
+ *
+ * Returns 0 for success.
+ */
+static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct cs4270_private *cs4270 = codec->private_data;
+ int left = !ucontrol->value.integer.value[0];
+ int right = !ucontrol->value.integer.value[1];
+
+ cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) |
+ (right ? CS4270_MUTE_DAC_B : 0);
+
+ return snd_soc_put_volsw(kcontrol, ucontrol);
+}
+