1 files changed, 157 insertions, 0 deletions
diff --git a/hw/backlight.c b/hw/backlight.c
new file mode 100644
index 0000000..43763ed
--- /dev/null
+++ b/hw/backlight.c
@@ -0,0 +1,157 @@
+/*
+ * device-node
+ *
+ * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <linux/limits.h>
+
+#include <hw/backlight.h>
+#include "shared.h"
+
+#ifndef BACKLIGHT_PATH
+#define BACKLIGHT_PATH	"/sys/class/backlight/s6e8aa0-bl"
+#endif
+
+static int get_max_brightness(int *val)
+{
+	static int max = -1;
+	int r;
+
+	if (!val)
+		return -EINVAL;
+
+	if (max < 0) {
+		r = sys_get_int(BACKLIGHT_PATH"/max_brightness", &max);
+		if (r < 0)
+			return r;
+	}
+
+	*val = max;
+	return 0;
+}
+
+static int backlight_get_brightness(int *brightness)
+{
+	int r, v;
+
+	if (!brightness) {
+		_E("wrong parameter");
+		return -EINVAL;
+	}
+
+	r = sys_get_int(BACKLIGHT_PATH"/brightness", &v);
+	if (r < 0) {
+		_E("fail to get brightness : %s", strerror(r));
+		return r;
+	}
+
+	*brightness = v;
+	return 0;
+}
+
+static int backlight_set_brightness(int brightness)
+{
+	int r, v, max;
+
+	if (brightness < 0 || brightness > 100) {
+		_E("wrong parameter");
+		return -EINVAL;
+	}
+
+	r = get_max_brightness(&max);
+	if (r < 0) {
+		_E("fail to get max brightness : %s", strerror(r));
+		return r;
+	}
+
+	v = brightness/100.f*max;
+	r = sys_set_int(BACKLIGHT_PATH"/brightness", v);
+	if (r < 0) {
+		_E("fail to set brightness : %s", strerror(r));
+		return r;
+	}
+
+	return 0;
+}
+
+static int backlight_get_mode(enum backlight_mode *mode)
+{
+	if (!mode) {
+		_E("wrong parameter");
+		return -EINVAL;
+	}
+
+	*mode = BACKLIGHT_MANUAL;
+	return 0;
+}
+
+static int backlight_set_mode(enum backlight_mode mode)
+{
+	if (mode == BACKLIGHT_SENSOR) {
+		_E("not supported option");
+		return -ENOTSUP;
+	}
+
+	return 0;
+}
+
+static int backlight_open(struct hw_info *info,
+		const char *id, struct hw_common **common)
+{
+	struct backlight_device *backlight_dev;
+
+	if (!info || !common)
+		return -EINVAL;
+
+	backlight_dev = calloc(1, sizeof(struct backlight_device));
+	if (!backlight_dev)
+		return -ENOMEM;
+
+	backlight_dev->common.info = info;
+	backlight_dev->get_brightness = backlight_get_brightness;
+	backlight_dev->set_brightness = backlight_set_brightness;
+	backlight_dev->get_mode = backlight_get_mode;
+	backlight_dev->set_mode = backlight_set_mode;
+
+	*common = (struct hw_common *)backlight_dev;
+	return 0;
+}
+
+static int backlight_close(struct hw_common *common)
+{
+	if (!common)
+		return -EINVAL;
+
+	free(common);
+	return 0;
+}
+
+EXPORT
+struct hw_info HARDWARE_INFO_SYM = {
+	.magic = HARDWARE_INFO_TAG,
+	.hal_version = HARDWARE_INFO_VERSION,
+	.device_version = BACKLIGHT_HARDWARE_DEVICE_VERSION,
+	.id = BACKLIGHT_HARDWARE_DEVICE_ID,
+	.name = "Default Backlight",
+	.author = "Jiyoung Yun <jy910.yun@samsung.com>",
+	.open = backlight_open,
+	.close = backlight_close,
+};