Move lights example from device/generic/brillo.

Centralize all the example code for Brillo by moving the lights
example from device/generic/brillo.

BUG=25927954
TEST=lights-hal-example-app builds for dragonboard.

Change-Id: I9e6bb54b8c6955775a9846123a4535b8e645da0e

3 files changed, 107 insertions, 0 deletions

diff --git a/lights_example/example-app/Android.mk b/lights_example/example-app/Android.mk
new file mode 100644
index 0000000..2f7feec
--- /dev/null
+++ b/lights_example/example-app/Android.mk
@@ -0,0 +1,28 @@
+#
+# Copyright (C) 2015 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.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := lights-hal-example-app
+LOCAL_MODULE_TAGS := optional
+LOCAL_SRC_FILES := hal-example-app.cpp
+LOCAL_SHARED_LIBRARIES := \
+  libc \
+  libhardware \
+
+include $(BUILD_EXECUTABLE)
diff --git a/lights_example/example-app/README b/lights_example/example-app/README
new file mode 100644
index 0000000..a8fc128
--- /dev/null
+++ b/lights_example/example-app/README
@@ -0,0 +1,8 @@
+This folder contains example code for writing native apps that use Brillo LED
+lights.
+
+Example files:
+  hal-example-app.cpp:
+    An example app that uses the lights HAL (defined in
+    hardware/libhardware/include/lights.h) directly. The app turns on the LED
+    light used for notifications, and turns it off 3 seconds later.
diff --git a/lights_example/example-app/hal-example-app.cpp b/lights_example/example-app/hal-example-app.cpp
new file mode 100644
index 0000000..ea5faf4
--- /dev/null
+++ b/lights_example/example-app/hal-example-app.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2015 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 <err.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <hardware/hardware.h>
+#include <hardware/lights.h>
+
+int main() {
+  const hw_module_t* module = nullptr;
+  struct light_device_t* light_device = nullptr;
+
+  int ret = hw_get_module(LIGHTS_HARDWARE_MODULE_ID, &module);
+  if (ret || !module) {
+    err(1, "Failed to load %s module", LIGHTS_HARDWARE_MODULE_ID);
+  }
+
+  ret = module->methods->open(
+      module, LIGHT_ID_NOTIFICATIONS,
+      reinterpret_cast<struct hw_device_t**>(&light_device));
+  if (ret || !light_device) {
+    err(1, "Failed to open light device for %s", LIGHT_ID_NOTIFICATIONS);
+  }
+
+  struct light_state_t state = {
+      color: 1,
+      flashMode: LIGHT_FLASH_NONE,
+      flashOnMS: 0,
+      flashOffMS: 0,
+      brightnessMode: 0,
+  };
+  struct light_state_t state_flash = {
+      color: 1,
+      flashMode: LIGHT_FLASH_TIMED,
+      flashOnMS: 50,
+      flashOffMS: 50,
+      brightnessMode: 0,
+  };
+
+  // On for three seconds.
+  light_device->set_light(light_device, &state);
+  sleep(3);
+
+  // Flash for three seconds.
+  light_device->set_light(light_device, &state_flash);
+  sleep(3);
+
+  // Off.
+  state.color = 0;
+  light_device->set_light(light_device, &state);
+
+  light_device->common.close(
+      reinterpret_cast<struct hw_device_t*>(light_device));
+
+  return 0;
+}