Liblight module

Small liblight module for Sony LT26 device.

Signed-off-by: Andreas Makris <andreas.makris@gmail.com>
Change-Id: Id8b2b8e4a6fea9f5839376fdfe3ae6082e030e75

6 files changed, 524 insertions, 0 deletions

diff --git a/device.mk b/device.mk
index 29431a7..e3bd6a0 100644
--- a/device.mk
+++ b/device.mk
@@ -22,3 +22,6 @@ endif
 
 PRODUCT_COPY_FILES += \
     $(LOCAL_KERNEL):kernel
+
+PRODUCT_PACKAGES := \
+    lights.lt26
diff --git a/liblight/Android.mk b/liblight/Android.mk
new file mode 100644
index 0000000..c5baf96
--- /dev/null
+++ b/liblight/Android.mk
@@ -0,0 +1,31 @@
+# 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.
+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_C_INCLUDES += $(LOCAL_PATH)
+
+LOCAL_PRELINK_MODULE := false
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+LOCAL_SHARED_LIBRARIES := liblog
+
+LOCAL_MODULE := lights.lt26
+
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/liblight/MODULE_LICENSE_APACHE2 b/liblight/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/liblight/MODULE_LICENSE_APACHE2
diff --git a/liblight/NOTICE b/liblight/NOTICE
new file mode 100644
index 0000000..7340b9e
--- /dev/null
+++ b/liblight/NOTICE
@@ -0,0 +1,190 @@
+
+   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.
+
+   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.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      "License" shall mean the terms and conditions for use, reproduction,
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
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+      Contribution(s) alone or by combination of their Contribution(s)
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+      institute patent litigation against any entity (including a
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+   4. Redistribution. You may reproduce and distribute copies of the
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diff --git a/liblight/lights.c b/liblight/lights.c
new file mode 100644
index 0000000..942604d
--- /dev/null
+++ b/liblight/lights.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * Copyright (C) 2011 Diogo Ferreira <defer@cyanogenmod.com>
+ * Copyright (C) 2012 Andreas Makris <andreas.makris@gmail.com>
+ * Copyright (C) 2012 The CyanogenMod Project <http://www.cyanogenmod.com>
+ *
+ * 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.lt26"
+
+#include <cutils/log.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include <hardware/lights.h>
+#include "lights.h"
+
+/* Synchronization primities */
+static pthread_once_t g_init = PTHREAD_ONCE_INIT;
+static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/* Mini-led state machine */
+static struct light_state_t g_notification;
+static struct light_state_t g_battery;
+
+static int g_backlight = 255;
+
+/* The leds we have */
+enum {
+	LED_RED,
+	LED_GREEN,
+	LED_BLUE,
+	LED_BLANK
+};
+
+enum {
+	MANUAL = 0,
+	AUTOMATIC,
+	MANUAL_SENSOR
+};
+
+static int write_int (const char *path, int value) {
+	int fd;
+	static int already_warned = 0;
+
+	fd = open(path, O_RDWR);
+	if (fd < 0) {
+		if (already_warned == 0) {
+			ALOGE("write_int failed to open %s\n", path);
+			already_warned = 1;
+		}
+		return -errno;
+	}
+
+	char buffer[20];
+	int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);
+	int written = write (fd, buffer, bytes);
+	close(fd);
+
+	return written == -1 ? -errno : 0;
+}
+
+static int write_string (const char *path, const char *value) {
+	int fd;
+	static int already_warned = 0;
+
+	fd = open(path, O_RDWR);
+	if (fd < 0) {
+		if (already_warned == 0) {
+			ALOGE("write_string failed to open %s\n", path);
+			already_warned = 1;
+		}
+		return -errno;
+	}
+
+	char buffer[20];
+	int bytes = snprintf(buffer, sizeof(buffer), "%s\n", value);
+	int written = write (fd, buffer, bytes);
+	close(fd);
+
+	return written == -1 ? -errno : 0;
+}
+
+
+/* Color tools */
+static int is_lit (struct light_state_t const* state) {
+	return state->color & 0x00ffffff;
+}
+
+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;
+}
+
+/* The actual lights controlling section */
+static int set_light_backlight (struct light_device_t *dev, struct light_state_t const *state) {
+	int brightness = rgb_to_brightness(state);
+	int als_mode;
+
+	switch (state->brightnessMode) {
+		case BRIGHTNESS_MODE_SENSOR:
+			als_mode = AUTOMATIC;
+			break;
+		case BRIGHTNESS_MODE_USER:
+			als_mode = BRIGHTNESS_MODE_USER;
+			break;
+		default:
+			als_mode = MANUAL_SENSOR;
+			break;
+	}
+
+	ALOGV("%s brightness=%d color=0x%08x", __func__,brightness,state->color);
+	pthread_mutex_lock(&g_lock);
+	g_backlight = brightness;
+	write_int (ALS_FILE, als_mode);
+	write_int (LCD_BACKLIGHT_FILE, brightness);
+	pthread_mutex_unlock(&g_lock);
+	return 0;
+}
+
+static int set_light_buttons (struct light_device_t *dev, struct light_state_t const* state) {
+	size_t i;
+	int on = is_lit(state);
+	pthread_mutex_lock(&g_lock);
+
+	for (i = 0; i < sizeof(BUTTON_BACKLIGHT_FILE)/sizeof(BUTTON_BACKLIGHT_FILE[0]); i++) {
+		write_int (BUTTON_BACKLIGHT_FILE[i],on?255:0);
+	}
+
+	pthread_mutex_unlock(&g_lock);
+
+	return 0;
+}
+
+static void set_shared_light_locked (struct light_device_t *dev, struct light_state_t *state) {
+	int r, g, b;
+	int delayOn,delayOff;
+
+	r = (state->color >> 16) & 0xFF;
+	g = (state->color >> 8) & 0xFF;
+	b = (state->color) & 0xFF;
+
+        delayOn = state->flashOnMS;
+	delayOff = state->flashOffMS;
+
+	if (state->flashMode != LIGHT_FLASH_NONE) {
+		write_string (RED_LED_FILE_TRIGGER, "timer");
+		write_string (GREEN_LED_FILE_TRIGGER, "timer");
+		write_string (BLUE_LED_FILE_TRIGGER, "timer");
+
+		write_int (RED_LED_FILE_DELAYON, delayOn);
+		write_int (GREEN_LED_FILE_DELAYON, delayOn);
+		write_int (BLUE_LED_FILE_DELAYON, delayOn);
+
+		write_int (RED_LED_FILE_DELAYOFF, delayOff);
+		write_int (GREEN_LED_FILE_DELAYOFF, delayOff);
+		write_int (BLUE_LED_FILE_DELAYOFF, delayOff);
+	} else {
+		write_string (RED_LED_FILE_TRIGGER, "none");
+		write_string (GREEN_LED_FILE_TRIGGER, "none");
+		write_string (BLUE_LED_FILE_TRIGGER, "none");
+	}
+
+	write_int (RED_LED_FILE, r);
+	write_int (GREEN_LED_FILE, g);
+	write_int (BLUE_LED_FILE, b);
+}
+
+static void handle_shared_battery_locked (struct light_device_t *dev) {
+	if (is_lit (&g_notification)) {
+		set_shared_light_locked (dev, &g_notification);
+	} else {
+		set_shared_light_locked (dev, &g_battery);
+	}
+}
+
+static int set_light_battery (struct light_device_t *dev, struct light_state_t const* state) {
+	pthread_mutex_lock (&g_lock);
+	g_battery = *state;
+	handle_shared_battery_locked(dev);
+	pthread_mutex_unlock (&g_lock);
+	return 0;
+}
+
+static int set_light_notifications (struct light_device_t *dev, struct light_state_t const* state) {
+	pthread_mutex_lock (&g_lock);
+	g_notification = *state;
+	handle_shared_battery_locked(dev);
+	pthread_mutex_unlock (&g_lock);
+	return 0;
+}
+
+/* Initializations */
+void init_globals () {
+	pthread_mutex_init (&g_lock, NULL);
+}
+
+/* Glueing boilerplate */
+static int close_lights (struct light_device_t *dev) {
+	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);
+
+	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_BATTERY, name)) {
+		set_light = set_light_battery;
+	}
+	else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
+		set_light = set_light_notifications;
+	}
+	else {
+		return -EINVAL;
+	}
+
+	pthread_once (&g_init, init_globals);
+	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,
+};
+
+
+struct hw_module_t HAL_MODULE_INFO_SYM = {
+	.tag = HARDWARE_MODULE_TAG,
+	.version_major = 1,
+	.version_minor = 0,
+	.id = LIGHTS_HARDWARE_MODULE_ID,
+	.name = "Sony lights module",
+	.author = "Diogo Ferreira <defer@cyanogenmod.com>, Andreas Makris <Andreas.Makris@gmail.com>",
+	.methods = &lights_module_methods,
+};
diff --git a/liblight/lights.h b/liblight/lights.h
new file mode 100644
index 0000000..4fa4c1d
--- /dev/null
+++ b/liblight/lights.h
@@ -0,0 +1,27 @@
+char const*const RED_LED_FILE 			= "/sys/class/leds/red/brightness";
+char const*const GREEN_LED_FILE 		= "/sys/class/leds/green/brightness";
+char const*const BLUE_LED_FILE 			= "/sys/class/leds/blue/brightness";
+
+char const*const RED_LED_FILE_TRIGGER	  = "/sys/class/leds/red/trigger";
+char const*const GREEN_LED_FILE_TRIGGER	= "/sys/class/leds/green/trigger";
+char const*const BLUE_LED_FILE_TRIGGER	= "/sys/class/leds/blue/trigger";
+
+char const*const RED_LED_FILE_DELAYON	= "/sys/class/leds/red/delay_on";
+char const*const GREEN_LED_FILE_DELAYON	= "/sys/class/leds/green/delay_on";
+char const*const BLUE_LED_FILE_DELAYON	= "/sys/class/leds/blue/delay_on";
+
+char const*const RED_LED_FILE_DELAYOFF	= "/sys/class/leds/red/delay_off";
+char const*const GREEN_LED_FILE_DELAYOFF	= "/sys/class/leds/green/delay_off";
+char const*const BLUE_LED_FILE_DELAYOFF	= "/sys/class/leds/blue/delay_off";
+
+
+char const*const BUTTON_BACKLIGHT_FILE[] = {
+  "/sys/class/leds/button-backlight/brightness",
+  "/sys/class/leds/button-backlight-rgb1/brightness",
+  "/sys/class/leds/button-backlight-rgb2/brightness",
+  "/sys/class/leds/keyboard-backlight/brightness"
+};
+
+char const*const LCD_BACKLIGHT_FILE	= "/sys/class/leds/lcd-backlight/brightness";
+
+char const*const ALS_FILE	= "/sys/class/leds/lcd-backlight/als/enable";