From 1af33456dc9d6e6a1f1318bf7ac5090020e26c1c Mon Sep 17 00:00:00 2001
From: Ethan Chen <intervigil@gmail.com>
Date: Sun, 7 Jun 2015 11:34:30 -0700
Subject: audio: Add audio amplifier HAL

Change-Id: Iad42bcc183dda7dba62a67959fb793e089c5d46e
---
 modules/audio/Android.mk        |  13 +++++
 modules/audio/audio_amplifier.c | 123 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 136 insertions(+)
 create mode 100644 modules/audio/audio_amplifier.c

(limited to 'modules')

diff --git a/modules/audio/Android.mk b/modules/audio/Android.mk
index ef4b8f5..8dfda57 100644
--- a/modules/audio/Android.mk
+++ b/modules/audio/Android.mk
@@ -60,3 +60,16 @@ LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS := -Wno-unused-parameter
 
 include $(BUILD_SHARED_LIBRARY)
+
+# The stub audio amplifier HAL module that can be used as a skeleton for
+# new implementations.
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := audio_amplifier.default
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := audio_amplifier.c
+LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_MODULE_TAGS := optional
+LOCAL_CFLAGS := -Wno-unused-parameter
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/modules/audio/audio_amplifier.c b/modules/audio/audio_amplifier.c
new file mode 100644
index 0000000..b65a82d
--- /dev/null
+++ b/modules/audio/audio_amplifier.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod 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 "amplifier_default"
+//#define LOG_NDEBUG 0
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <cutils/log.h>
+
+#include <hardware/audio_amplifier.h>
+#include <hardware/hardware.h>
+
+static int amp_set_input_devices(amplifier_device_t *device, uint32_t devices)
+{
+    return 0;
+}
+
+static int amp_set_output_devices(amplifier_device_t *device, uint32_t devices)
+{
+    return 0;
+}
+
+static int amp_set_mode(amplifier_device_t *device, audio_mode_t mode)
+{
+    return 0;
+}
+
+static int amp_output_stream_start(amplifier_device_t *device,
+        struct audio_stream_out *stream, bool offload)
+{
+    return 0;
+}
+
+static int amp_input_stream_start(amplifier_device_t *device,
+        struct audio_stream_in *stream)
+{
+    return 0;
+}
+
+static int amp_output_stream_standby(amplifier_device_t *device,
+        struct audio_stream_out *stream)
+{
+    return 0;
+}
+
+static int amp_input_stream_standby(amplifier_device_t *device,
+        struct audio_stream_in *stream)
+{
+    return 0;
+}
+
+static int amp_dev_close(hw_device_t *device)
+{
+    if (device)
+        free(device);
+
+    return 0;
+}
+
+static int amp_module_open(const hw_module_t *module, const char *name,
+        hw_device_t **device)
+{
+    if (strcmp(name, AMPLIFIER_HARDWARE_INTERFACE)) {
+        ALOGE("%s:%d: %s does not match amplifier hardware interface name\n",
+                __func__, __LINE__, name);
+        return -ENODEV;
+    }
+
+    amplifier_device_t *amp_dev = calloc(1, sizeof(amplifier_device_t));
+    if (!amp_dev) {
+        ALOGE("%s:%d: Unable to allocate memory for amplifier device\n",
+                __func__, __LINE__);
+        return -ENOMEM;
+    }
+
+    amp_dev->common.tag = HARDWARE_DEVICE_TAG;
+    amp_dev->common.module = (hw_module_t *) module;
+    amp_dev->common.version = HARDWARE_DEVICE_API_VERSION(1, 0);
+    amp_dev->common.close = amp_dev_close;
+
+    amp_dev->set_input_devices = amp_set_input_devices;
+    amp_dev->set_output_devices = amp_set_output_devices;
+    amp_dev->set_mode = amp_set_mode;
+    amp_dev->output_stream_start = amp_output_stream_start;
+    amp_dev->input_stream_start = amp_input_stream_start;
+    amp_dev->output_stream_standby = amp_output_stream_standby;
+    amp_dev->input_stream_standby = amp_input_stream_standby;
+
+    *device = (hw_device_t *) amp_dev;
+
+    return 0;
+}
+
+static struct hw_module_methods_t hal_module_methods = {
+    .open = amp_module_open,
+};
+
+amplifier_module_t HAL_MODULE_INFO_SYM = {
+    .common = {
+        .tag = HARDWARE_MODULE_TAG,
+        .module_api_version = AMPLIFIER_MODULE_API_VERSION_0_1,
+        .hal_api_version = HARDWARE_HAL_API_VERSION,
+        .id = AMPLIFIER_HARDWARE_MODULE_ID,
+        .name = "Default audio amplifier HAL",
+        .author = "The CyanogenMod Open Source Project",
+        .methods = &hal_module_methods,
+    },
+};
-- 
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