Add light module for backlight

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Change-Id: I75956a352472b4503e85058570255fd651ac3795

3 files changed, 354 insertions, 0 deletions

diff --git a/liblight/Android.mk b/liblight/Android.mk
new file mode 100755
index 0000000..9abad27
--- /dev/null
+++ b/liblight/Android.mk
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+# Copyright (C) 2008 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.
+
+ifneq ($(filter tuna,$(TARGET_DEVICE)),)
+
+LOCAL_PATH:= $(call my-dir)
+# HAL module implemenation stored in
+# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.board.platform>.so
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := lights.c
+
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+LOCAL_SHARED_LIBRARIES := liblog
+
+LOCAL_MODULE := lights.tuna
+
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
+
+endif
diff --git a/liblight/NOTICE b/liblight/NOTICE
new file mode 100755
index 0000000..f921593
--- /dev/null
+++ b/liblight/NOTICE
@@ -0,0 +1,190 @@
+
+   Copyright (C) 2008 The Android Open Source Project
+
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+   See the License for the specific language governing permissions and
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diff --git a/liblight/lights.c b/liblight/lights.c
new file mode 100755
index 0000000..ac6eafc
--- /dev/null
+++ b/liblight/lights.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2008 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 "lights"
+#include <cutils/log.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <hardware/lights.h>
+
+static pthread_once_t g_init = PTHREAD_ONCE_INIT;
+static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
+
+char const *const LCD_FILE = "/sys/class/backlight/s6e8aa0/brightness";
+
+static int write_int(char const *path, int value)
+{
+	int fd;
+	static int already_warned;
+
+	already_warned = 0;
+
+	LOGV("write_int: path %s, value %d", path, value);
+	fd = open(path, O_RDWR);
+
+	if (fd >= 0) {
+		char buffer[20];
+		int bytes = sprintf(buffer, "%d\n", value);
+		int amt = write(fd, buffer, bytes);
+		close(fd);
+		return amt == -1 ? -errno : 0;
+	} else {
+		if (already_warned == 0) {
+			LOGE("write_int failed to open %s\n", path);
+			already_warned = 1;
+		}
+		return -errno;
+	}
+}
+
+static int rgb_to_brightness(struct light_state_t const *state)
+{
+	int color = state->color & 0x00ffffff;
+
+	return ((77*((color>>16) & 0x00ff))
+		+ (150*((color>>8) & 0x00ff)) + (29*(color & 0x00ff))) >> 8;
+}
+
+static int set_light_backlight(struct light_device_t *dev,
+			struct light_state_t const *state)
+{
+	int err = 0;
+	int brightness = rgb_to_brightness(state);
+
+	pthread_mutex_lock(&g_lock);
+	err = write_int(LCD_FILE, brightness);
+
+	pthread_mutex_unlock(&g_lock);
+	return err;
+}
+
+static int close_lights(struct light_device_t *dev)
+{
+	LOGV("close_light is called");
+	if (dev)
+		free(dev);
+
+	return 0;
+}
+
+static int open_lights(const struct hw_module_t *module, char const *name,
+						struct hw_device_t **device)
+{
+	int (*set_light)(struct light_device_t *dev,
+		struct light_state_t const *state);
+
+	LOGV("open_lights: open with %s", name);
+
+	if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
+		set_light = set_light_backlight;
+	else
+		return -EINVAL;
+
+	pthread_mutex_init(&g_lock, NULL);
+
+	struct light_device_t *dev = malloc(sizeof(struct light_device_t));
+	memset(dev, 0, sizeof(*dev));
+
+	dev->common.tag = HARDWARE_DEVICE_TAG;
+	dev->common.version = 0;
+	dev->common.module = (struct hw_module_t *)module;
+	dev->common.close = (int (*)(struct hw_device_t *))close_lights;
+	dev->set_light = set_light;
+
+	*device = (struct hw_device_t *)dev;
+
+	return 0;
+}
+
+static struct hw_module_methods_t lights_module_methods = {
+	.open =  open_lights,
+};
+
+const struct hw_module_t HAL_MODULE_INFO_SYM = {
+	.tag = HARDWARE_MODULE_TAG,
+	.version_major = 1,
+	.version_minor = 0,
+	.id = LIGHTS_HARDWARE_MODULE_ID,
+	.name = "lights Module",
+	.author = "Google, Inc.",
+	.methods = &lights_module_methods,
+};