foo.diff

diff --git a/amplifier/audio_amplifier.c b/amplifier/audio_amplifier.c
index 9ce8d4a..8db75ef 100644
--- a/amplifier/audio_amplifier.c
+++ b/amplifier/audio_amplifier.c
@@ -87,6 +87,14 @@ static int amp_output_stream_start(amplifier_device_t *device,
     return 0;
 }
 
+static int amp_output_stream_standby(UNUSED amplifier_device_t *device,
+        UNUSED struct audio_stream_out *stream)
+{
+    tfa9887_set_mute();
+
+    return 0;
+}
+
 static int amp_dev_close(hw_device_t *device)
 {
     m8_device_t *dev = (m8_device_t *) device;
@@ -124,7 +132,7 @@ static int amp_module_open(const hw_module_t *module, UNUSED const char *name,
     m8_dev->amp_dev.set_mode = amp_set_mode;
     m8_dev->amp_dev.output_stream_start = amp_output_stream_start;
     m8_dev->amp_dev.input_stream_start = NULL;
-    m8_dev->amp_dev.output_stream_standby = NULL;
+    m8_dev->amp_dev.output_stream_standby = amp_output_stream_standby;
     m8_dev->amp_dev.input_stream_standby = NULL;
 
     m8_dev->current_output_devices = SND_DEVICE_NONE;
diff --git a/amplifier/tfa9887.c b/amplifier/tfa9887.c
index 715ba35..b7ae63b 100644
--- a/amplifier/tfa9887.c
+++ b/amplifier/tfa9887.c
@@ -1195,6 +1195,32 @@ static int tfa9887_lock(struct tfa9887_amp_t *amp, bool lock)
     return rc;
 }
 
+int tfa9887_set_mute()
+{
+    int rc, i;
+    struct tfa9887_amp_t *amp = NULL;
+
+    if (!amps) {
+        ALOGE("%s: TFA9887 not opened\n", __func__);
+        return -ENODEV;
+    }
+
+    for (i = 0; i < AMP_MAX; i++) {
+        amp = &amps[i];
+
+        rc = tfa9887_lock(amp, true);
+        if (rc) {
+            /* Try next amp */
+            continue;
+        }
+        rc = tfa9887_mute(amp, TFA9887_MUTE_DIGITAL);
+//        rc = tfa9887_mute(amp, TFA9887_MUTE_AMPLIFIER);
+        rc = tfa9887_lock(amp, false);
+    }
+
+    return 0;
+}
+
 static int tfa9887_enable_dsp(struct tfa9887_amp_t *amp, bool enable)
 {
     int rc;
diff --git a/amplifier/tfa9887.h b/amplifier/tfa9887.h
index 6252e03..9c576dc 100644
--- a/amplifier/tfa9887.h
+++ b/amplifier/tfa9887.h
@@ -217,5 +217,6 @@ struct tfa9887_amp_t {
 int tfa9887_open(void);
 int tfa9887_set_mode(audio_mode_t mode);
 int tfa9887_close(void);
+int tfa9887_set_mute(void);
 
 #endif