diff --git a/modules/usbaudio/logging.c b/modules/usbaudio/logging.c
new file mode 100644
index 0000000..0a05511
--- /dev/null
+++ b/modules/usbaudio/logging.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#define LOG_TAG "usb_logging"
+/*#define LOG_NDEBUG 0*/
+
+#include <string.h>
+
+#include <log/log.h>
+
+#include "logging.h"
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+/*
+ * Logging
+ */
+void log_pcm_mask(const char* mask_name, struct pcm_mask* mask)
+{
+    const size_t num_slots = ARRAY_SIZE(mask->bits);
+    const size_t bits_per_slot = (sizeof(mask->bits[0]) * 8);
+    const size_t chars_per_slot = (bits_per_slot + 1); /* comma */
+
+    const size_t BUFF_SIZE =
+            (num_slots * chars_per_slot + 2 + 1);  /* brackets and null-terminator */
+    char buff[BUFF_SIZE];
+    buff[0] = '\0';
+
+    size_t slot_index, bit_index;
+    strcat(buff, "[");
+    for (slot_index = 0; slot_index < num_slots; slot_index++) {
+        unsigned bit_mask = 1;
+        for (bit_index = 0; bit_index < bits_per_slot; bit_index++) {
+            strcat(buff, (mask->bits[slot_index] & bit_mask) != 0 ? "1" : "0");
+            bit_mask <<= 1;
+        }
+        if (slot_index < num_slots - 1) {
+            strcat(buff, ",");
+        }
+    }
+    strcat(buff, "]");
+
+    ALOGV("%s: mask:%s", mask_name, buff);
+}
+
+void log_pcm_params(struct pcm_params * alsa_hw_params)
+{
+    ALOGV("usb:audio_hw - PCM_PARAM_SAMPLE_BITS min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_SAMPLE_BITS),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_SAMPLE_BITS));
+    ALOGV("usb:audio_hw - PCM_PARAM_FRAME_BITS min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_FRAME_BITS),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_FRAME_BITS));
+    log_pcm_mask("PCM_PARAM_FORMAT",
+                 pcm_params_get_mask(alsa_hw_params, PCM_PARAM_FORMAT));
+    log_pcm_mask("PCM_PARAM_SUBFORMAT",
+                 pcm_params_get_mask(alsa_hw_params, PCM_PARAM_SUBFORMAT));
+    ALOGV("usb:audio_hw - PCM_PARAM_CHANNELS min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_CHANNELS),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_CHANNELS));
+    ALOGV("usb:audio_hw - PCM_PARAM_RATE min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_RATE),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_RATE));
+    ALOGV("usb:audio_hw - PCM_PARAM_PERIOD_TIME min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIOD_TIME),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_PERIOD_TIME));
+    ALOGV("usb:audio_hw - PCM_PARAM_PERIOD_SIZE min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIOD_SIZE),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_PERIOD_SIZE));
+    ALOGV("usb:audio_hw - PCM_PARAM_PERIOD_BYTES min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIOD_BYTES),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_PERIOD_BYTES));
+    ALOGV("usb:audio_hw - PCM_PARAM_PERIODS min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIODS),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_PERIODS));
+    ALOGV("usb:audio_hw - PCM_PARAM_BUFFER_TIME min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_BUFFER_TIME),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_BUFFER_TIME));
+    ALOGV("usb:audio_hw - PCM_PARAM_BUFFER_SIZE min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_BUFFER_SIZE),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_BUFFER_SIZE));
+    ALOGV("usb:audio_hw - PCM_PARAM_BUFFER_BYTES min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_BUFFER_BYTES),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_BUFFER_BYTES));
+    ALOGV("usb:audio_hw - PCM_PARAM_TICK_TIME min:%u, max:%u",
+          pcm_params_get_min(alsa_hw_params, PCM_PARAM_TICK_TIME),
+          pcm_params_get_max(alsa_hw_params, PCM_PARAM_TICK_TIME));
+}
+
+void log_pcm_config(struct pcm_config * config, const char* label) {
+    ALOGV("log_pcm_config() - %s", label);
+    ALOGV("  channels:%d", config->channels);
+    ALOGV("  rate:%d", config->rate);
+    ALOGV("  period_size:%d", config->period_size);
+    ALOGV("  period_count:%d", config->period_count);
+    ALOGV("  format:%d", config->format);
+#if 0
+    /* Values to use for the ALSA start, stop and silence thresholds.  Setting
+     * any one of these values to 0 will cause the default tinyalsa values to be
+     * used instead.  Tinyalsa defaults are as follows.
+     *
+     * start_threshold   : period_count * period_size
+     * stop_threshold    : period_count * period_size
+     * silence_threshold : 0
+     */
+    unsigned int start_threshold;
+    unsigned int stop_threshold;
+    unsigned int silence_threshold;
+
+    /* Minimum number of frames available before pcm_mmap_write() will actually
+     * write into the kernel buffer. Only used if the stream is opened in mmap mode
+     * (pcm_open() called with PCM_MMAP flag set).   Use 0 for default.
+     */
+    int avail_min;
+#endif
+}