diff --git a/automotive/audiocontrol/2.0/default/AudioControl.cpp b/automotive/audiocontrol/2.0/default/AudioControl.cpp
index 6505e34..5bde839 100644
--- a/automotive/audiocontrol/2.0/default/AudioControl.cpp
+++ b/automotive/audiocontrol/2.0/default/AudioControl.cpp
@@ -1,12 +1,42 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 #include "AudioControl.h"
 
+#include <stdio.h>
+
 #include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/strings.h>
+
 #include <hidl/HidlTransportSupport.h>
+#include <hwbinder/IPCThreadState.h>
+#include <private/android_filesystem_config.h>
 
 #include "CloseHandle.h"
 
 namespace android::hardware::automotive::audiocontrol::V2_0::implementation {
 
+using ::android::base::EqualsIgnoreCase;
+using ::android::hardware::hidl_handle;
+using ::android::hardware::hidl_string;
+
+static const float kLowerBound = -1.0f;
+static const float kUpperBound = 1.0f;
+
 AudioControl::AudioControl() {}
 
 Return<sp<ICloseHandle>> AudioControl::registerFocusListener(const sp<IFocusListener>& listener) {
@@ -29,27 +59,29 @@
 }
 
 Return<void> AudioControl::setBalanceTowardRight(float value) {
-    // For completeness, lets bounds check the input...
     if (isValidValue(value)) {
-        LOG(ERROR) << "Balance value out of range -1 to 1 at " << value;
-    } else {
         // Just log in this default mock implementation
         LOG(INFO) << "Balance set to " << value;
+    } else {
+        LOG(ERROR) << "Balance value out of range -1 to 1 at " << value;
     }
     return Void();
 }
 
 Return<void> AudioControl::setFadeTowardFront(float value) {
-    // For completeness, lets bounds check the input...
-    if (isValidValue(value)) {
-        LOG(ERROR) << "Fader value out of range -1 to 1 at " << value;
-    } else {
+    if (!isValidValue(value)) {
         // Just log in this default mock implementation
         LOG(INFO) << "Fader set to " << value;
+    } else {
+        LOG(ERROR) << "Fader value out of range -1 to 1 at " << value;
     }
     return Void();
 }
 
+bool AudioControl::isValidValue(float value) {
+    return (value > kLowerBound) && (value < kUpperBound);
+}
+
 Return<void> AudioControl::onAudioFocusChange(hidl_bitfield<AudioUsage> usage, int zoneId,
                                               hidl_bitfield<AudioFocusChange> focusChange) {
     LOG(INFO) << "Focus changed: " << static_cast<int>(focusChange) << " for usage "
@@ -57,4 +89,132 @@
     return Void();
 }
 
+Return<void> AudioControl::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) {
+    if (fd.getNativeHandle() == nullptr || fd->numFds == 0) {
+        LOG(ERROR) << "Invalid parameters passed to debug()";
+        return Void();
+    }
+
+    cmdDump(fd->data[0], options);
+    return Void();
+}
+
+void AudioControl::cmdDump(int fd, const hidl_vec<hidl_string>& options) {
+    if (options.size() == 0) {
+        dump(fd);
+        return;
+    }
+
+    std::string option = options[0];
+    if (EqualsIgnoreCase(option, "--help")) {
+        cmdHelp(fd);
+    } else if (EqualsIgnoreCase(option, "--request")) {
+        cmdRequestFocus(fd, options);
+    } else if (EqualsIgnoreCase(option, "--abandon")) {
+        cmdAbandonFocus(fd, options);
+    } else {
+        dprintf(fd, "Invalid option: %s\n", option.c_str());
+    }
+}
+
+void AudioControl::dump(int fd) {
+    if (mFocusListener == nullptr) {
+        dprintf(fd, "No focus listener registered\n");
+    } else {
+        dprintf(fd, "Focus listener registered\n");
+    }
+}
+
+void AudioControl::cmdHelp(int fd) const {
+    dprintf(fd, "Usage: \n\n");
+    dprintf(fd, "[no args]: dumps focus listener status\n");
+    dprintf(fd, "--help: shows this help\n");
+    dprintf(fd,
+            "--request <USAGE> <ZONE_ID> <FOCUS_GAIN>: requests audio focus for specified "
+            "usage (int), audio zone ID (int), and focus gain type (int)\n");
+    dprintf(fd,
+            "--abandon <USAGE> <ZONE_ID>: abandons audio focus for specified usage (int) and "
+            "audio zone ID (int)\n");
+}
+
+void AudioControl::cmdRequestFocus(int fd, const hidl_vec<hidl_string>& options) {
+    if (!checkCallerHasWritePermissions(fd) || !checkArgumentsSize(fd, options, 3)) return;
+
+    hidl_bitfield<AudioUsage> usage;
+    if (!safelyParseInt(options[1], &usage)) {
+        dprintf(fd, "Non-integer usage provided with request: %s\n", options[1].c_str());
+        return;
+    }
+    int zoneId;
+    if (!safelyParseInt(options[2], &zoneId)) {
+        dprintf(fd, "Non-integer zoneId provided with request: %s\n", options[2].c_str());
+        return;
+    }
+    hidl_bitfield<AudioFocusChange> focusGain;
+    if (!safelyParseInt(options[3], &focusGain)) {
+        dprintf(fd, "Non-integer focusGain provided with request: %s\n", options[3].c_str());
+        return;
+    }
+
+    if (mFocusListener == nullptr) {
+        dprintf(fd, "Unable to request focus - no focus listener registered\n");
+        return;
+    }
+
+    mFocusListener->requestAudioFocus(usage, zoneId, focusGain);
+    dprintf(fd, "Requested focus for usage %d, zoneId %d, and focusGain %d\n", usage, zoneId,
+            focusGain);
+}
+
+void AudioControl::cmdAbandonFocus(int fd, const hidl_vec<hidl_string>& options) {
+    if (!checkCallerHasWritePermissions(fd) || !checkArgumentsSize(fd, options, 2)) return;
+
+    hidl_bitfield<AudioUsage> usage;
+    if (!safelyParseInt(options[1], &usage)) {
+        dprintf(fd, "Non-integer usage provided with abandon: %s\n", options[1].c_str());
+        return;
+    }
+    int zoneId;
+    if (!safelyParseInt(options[2], &zoneId)) {
+        dprintf(fd, "Non-integer zoneId provided with abandon: %s\n", options[2].c_str());
+        return;
+    }
+
+    if (mFocusListener == nullptr) {
+        dprintf(fd, "Unable to abandon focus - no focus listener registered\n");
+        return;
+    }
+
+    mFocusListener->abandonAudioFocus(usage, zoneId);
+    dprintf(fd, "Abandoned focus for usage %d and zoneId %d\n", usage, zoneId);
+}
+
+bool AudioControl::checkCallerHasWritePermissions(int fd) {
+    // Double check that's only called by root - it should be be blocked at the HIDL debug() level,
+    // but it doesn't hurt to make sure...
+    if (hardware::IPCThreadState::self()->getCallingUid() != AID_ROOT) {
+        dprintf(fd, "Must be root\n");
+        return false;
+    }
+    return true;
+}
+
+bool AudioControl::checkArgumentsSize(int fd, const hidl_vec<hidl_string>& options,
+                                      size_t expectedSize) {
+    // options includes the command, so reducing size by one
+    size_t size = options.size() - 1;
+    if (size == expectedSize) {
+        return true;
+    }
+    dprintf(fd, "Invalid number of arguments: required %zu, got %zu\n", expectedSize, size);
+    return false;
+}
+
+bool AudioControl::safelyParseInt(std::string s, int* out) {
+    if (!android::base::ParseInt(s, out)) {
+        return false;
+    }
+    return true;
+}
+
 }  // namespace android::hardware::automotive::audiocontrol::V2_0::implementation
diff --git a/automotive/audiocontrol/2.0/default/AudioControl.h b/automotive/audiocontrol/2.0/default/AudioControl.h
index 475a693..d66458e 100644
--- a/automotive/audiocontrol/2.0/default/AudioControl.h
+++ b/automotive/audiocontrol/2.0/default/AudioControl.h
@@ -35,13 +35,24 @@
                                     hidl_bitfield<AudioFocusChange> focusChange);
     Return<void> setBalanceTowardRight(float value) override;
     Return<void> setFadeTowardFront(float value) override;
+    Return<void> debug(const hidl_handle& fd, const hidl_vec<hidl_string>& options) override;
 
     // Implementation details
     AudioControl();
 
   private:
     sp<IFocusListener> mFocusListener;
-    static bool isValidValue(float value) { return (value > 1.0f) || (value < -1.0f); }
+
+    static bool checkArgumentsSize(int fd, const hidl_vec<hidl_string>& options, size_t minSize);
+    static bool checkCallerHasWritePermissions(int fd);
+    static bool isValidValue(float value);
+    static bool safelyParseInt(std::string s, int* out);
+
+    void cmdDump(int fd, const hidl_vec<hidl_string>& options);
+    void cmdHelp(int fd) const;
+    void cmdRequestFocus(int fd, const hidl_vec<hidl_string>& options);
+    void cmdAbandonFocus(int fd, const hidl_vec<hidl_string>& options);
+    void dump(int fd);
 };
 
 }  // namespace android::hardware::automotive::audiocontrol::V2_0::implementation