liblights: Add BLN support

Change-Id: I859416c484777fcf08b5bf8f72ba9f9838e4c1b3

4 files changed, 394 insertions, 1 deletions

diff --git a/exynos4/exynos4210/Android.mk b/exynos4/exynos4210/Android.mk
index a6f2620..853639e 100644
--- a/exynos4/exynos4210/Android.mk
+++ b/exynos4/exynos4210/Android.mk
@@ -15,7 +15,12 @@
 #
 
 ifeq ($(TARGET_BOARD_PLATFORM),exynos4)
-exynos4210_dirs := liblights
+
+	ifeq ($(BOARD_HAS_BLN),true)
+		exynos4210_dirs := liblightsbln
+	else
+		exynos4210_dirs := liblights
+	endif
 
 include $(call all-named-subdir-makefiles,$(exynos4210_dirs))
 
diff --git a/exynos4/exynos4210/liblightsbln/Android.mk b/exynos4/exynos4210/liblightsbln/Android.mk
new file mode 100644
index 0000000..c4f91ed
--- /dev/null
+++ b/exynos4/exynos4210/liblightsbln/Android.mk
@@ -0,0 +1,31 @@
+# Copyright (C) 2012 The CyanogenMod 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)
+# HAL module implemenation, not prelinked and stored in
+# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.board.platform>.so
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := lights.c
+
+LOCAL_PRELINK_MODULE := false
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+LOCAL_SHARED_LIBRARIES := liblog
+
+LOCAL_MODULE := lights.$(TARGET_BOARD_PLATFORM)
+
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/exynos4/exynos4210/liblightsbln/LICENSE b/exynos4/exynos4210/liblightsbln/LICENSE
new file mode 100644
index 0000000..5b8c40d
--- /dev/null
+++ b/exynos4/exynos4210/liblightsbln/LICENSE
@@ -0,0 +1,188 @@
+   Copyright (C) 2012 The CyanogenMod Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+
+   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.
+
+
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+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
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diff --git a/exynos4/exynos4210/liblightsbln/lights.c b/exynos4/exynos4210/liblightsbln/lights.c
new file mode 100644
index 0000000..6bfbbf4
--- /dev/null
+++ b/exynos4/exynos4210/liblightsbln/lights.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2012 The CyanogenMod 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 <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include <hardware/lights.h>
+#include <hardware/hardware.h>
+
+static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/** Paths to light files **/
+char const *const BACKLIGHT_FILE = "/sys/class/backlight/panel/brightness";
+char const *const BUTTON_FILE = "/sys/class/sec/sec_touchkey/brightness";
+char const *const NOTIFICATION_FILE = "/sys/class/misc/backlightnotification/notification_led";
+
+/** Write integer to file **/
+static int write_int(char const *path, int value)
+{
+	int fd;
+	static int already_warned = -1;
+	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 == -1) {
+			ALOGE("write_int failed to open %s\n", path);
+			already_warned = 1;
+		}
+		return -errno;
+	}
+}
+
+/** Convert RGB to 0-255 integer **/
+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;
+}
+
+/** Is light already enabled? **/
+static int is_lit(struct light_state_t const* state)
+{
+	return state->color & 0x00ffffff;
+}
+
+/** Set LCD backlight **/
+static int set_light_backlight(struct light_device_t *dev, struct light_state_t const *state)
+{
+	pthread_mutex_lock(&g_lock);
+	int err = write_int(BACKLIGHT_FILE, rgb_to_brightness(state));
+	pthread_mutex_unlock(&g_lock);
+	return err;
+}
+
+/** Set buttons backlight **/
+static int set_light_buttons(struct light_device_t* dev, struct light_state_t const* state)
+{
+	int err = 0;
+	pthread_mutex_lock (&g_lock);
+	if(is_lit(state))
+		err = write_int(BUTTON_FILE, 1);
+	else
+		err = write_int(BUTTON_FILE, 0);
+	pthread_mutex_unlock (&g_lock);
+	return err;
+}
+
+/** Set buttons backlight as BLN **/
+static int set_light_notifications(struct light_device_t* dev, struct light_state_t const* state)
+{
+	int err = 0;
+	pthread_mutex_lock (&g_lock);
+	if(is_lit(state))
+		err = write_int(NOTIFICATION_FILE, 1);
+	else
+		err = write_int(NOTIFICATION_FILE, 0);
+	pthread_mutex_unlock (&g_lock);
+	return err;
+}
+
+/** Close the lights device **/
+static int close_lights(struct light_device_t *dev)
+{
+	if (dev)
+		free(dev);
+	return 0;
+}
+
+/** Open a new instance of a lights device using name **/
+static int open_lights(const struct hw_module_t *module,
+			char const *name, struct hw_device_t **device)
+{
+	pthread_t lighting_poll_thread;
+
+	int (*set_light) (struct light_device_t *dev,
+			  struct light_state_t const *state);
+
+	if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
+		set_light = set_light_backlight;
+	else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
+		set_light = set_light_buttons;
+	else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
+		set_light = set_light_notifications;
+	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;
+}
+
+/** Method list **/
+static struct hw_module_methods_t lights_methods =
+{
+	.open =  open_lights,
+};
+
+/** The backlight module **/
+
+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 = "The CyanogenMod Project",
+	.methods = &lights_methods,
+};