liblights/lights.c - device/moto/stingray - Git at Google

 /*
  * 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 <dirent.h>
 #include <stdint.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>

 #include <linux/input.h>

 #include <sys/ioctl.h>
 #include <sys/poll.h>
 #include <sys/types.h>

 #include <hardware/lights.h>

 #define LIGHT_ATTENTION	1
 #define LIGHT_NOTIFY 	2

 /******************************************************************************/


 static struct light_state_t *g_notify;
 static struct light_state_t *g_attention;
 static pthread_once_t g_init = PTHREAD_ONCE_INIT;
 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;

 /**
  * device methods
  */

 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) {
 			LOGE("write_int failed to open %s\n", path);
 			already_warned = 1;
 		}
 		return -errno;
 	}
 }

 static int write_string(char const *path, char const *value)
 {
 	int fd;
 	static int already_warned = -1;
 	fd = open(path, O_RDWR);
 	if (fd >= 0) {
 		char buffer[20];
 		int bytes = sprintf(buffer, "%s\n", value);
 		int amt = write(fd, buffer, bytes);
 		close(fd);
 		return amt == -1 ? -errno : 0;
 	} else {
 		if (already_warned == -1) {
 			LOGE("write_int failed to open %s\n", path);
 			already_warned = 1;
 		}
 		return -errno;
 	}
 }

 void init_globals(void)
 {
 	pthread_mutex_init(&g_lock, NULL);

 	g_attention = malloc(sizeof(struct light_state_t));
 	memset(g_attention, 0, sizeof(*g_attention));
 	g_notify = malloc(sizeof(struct light_state_t));
 	memset(g_notify, 0, sizeof(*g_notify));
 }

 static int rgb_to_brightness(struct light_state_t const *state)
 {
 	/* use max of the RGB components for brightness */
 	int color = state->color & 0x00ffffff;
 	int red = (color >> 16) & 0x000000ff;
 	int green = (color >> 8) & 0x000000ff;
 	int blue = color & 0x000000ff;

 	int brightness = red;
 	if (green > brightness)
 		brightness = green;
 	if (blue > brightness)
 		brightness = blue;

 	return brightness;
 }

 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("/sys/class/leds/lcd-backlight/brightness", brightness);
 	pthread_mutex_unlock(&g_lock);

 	return err;
 }

 static int
 set_notification_light(struct light_state_t const* state)
 {
 	unsigned int brightness = rgb_to_brightness(state);
 	int blink = state->flashOnMS;

 	ALOGD("set_notification_light colorRGB=%08X, onMS=%d, offMS=%d\n",
 			state->color, state->flashOnMS, state->flashOffMS);

 	write_int("/sys/class/leds/notification-led/brightness", brightness);
 	write_int("/sys/class/leds/notification-led/blink", blink);

 	return 0;
 }

 static void
 handle_notification_light_locked(int type)
 {
 	struct light_state_t *new_state = 0;
 	int attn_mode = 0;

 	if (g_attention->flashMode == LIGHT_FLASH_HARDWARE)
 		attn_mode = g_attention->flashOnMS;

 	switch (type) {
 		case LIGHT_ATTENTION: {
 			if (attn_mode == 0) {
 				/* go back to notify state */
 				new_state = g_notify;
 			} else {
 				new_state = g_attention;
 			}
 		break;
 		}
 		case LIGHT_NOTIFY: {
 			if (attn_mode != 0) {
 				/* attention takes priority over notify state */
 				new_state = g_attention;
 			} else {
 				new_state = g_notify;
 			}
 		break;
 		}
 	}
 	if (new_state == 0) {
 		LOGE("%s: unknown type (%d)\n", __func__, type);
 		return;
 	}

 	set_notification_light(new_state);
 }

 static int
 set_light_notifications(struct light_device_t* dev,
 		struct light_state_t const* state)
 {
 	pthread_mutex_lock(&g_lock);

 	g_notify->color = state->color;
 	if (state->flashMode != LIGHT_FLASH_NONE) {
 		g_notify->flashMode = LIGHT_FLASH_HARDWARE;
 		g_notify->flashOnMS = state->flashOnMS;
 		g_notify->flashOffMS = state->flashOffMS;
 	} else {
 		g_notify->flashOnMS = 0;
 		g_notify->flashOffMS = 0;
 	}
 	handle_notification_light_locked(LIGHT_NOTIFY);

 	pthread_mutex_unlock(&g_lock);
 	return 0;
 }

 static int
 set_light_attention(struct light_device_t* dev,
 		struct light_state_t const* state)
 {
 	pthread_mutex_lock(&g_lock);

 	g_attention->flashMode = state->flashMode;
 	g_attention->flashOnMS = state->flashOnMS;
 	g_attention->color = state->color;
 	g_attention->flashOffMS = 0;
 	handle_notification_light_locked(LIGHT_ATTENTION);

 	pthread_mutex_unlock(&g_lock);
 	return 0;
 }

 /** Close the lights device */
 static int close_lights(struct light_device_t *dev)
 {
 	if (dev)
 		free(dev);
 	return 0;
 }

 /******************************************************************************/

 /**
  * module methods
  */

 /** 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_NOTIFICATIONS, name))
 		set_light = set_light_notifications;
 	else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
 		set_light = set_light_attention;
 	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,
 };

 /*
  * The lights Module
  */
 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 = "Nvidia lights Module",
 	.author = "Motorola, Inc.",
 	.methods = &lights_module_methods,
 };
	/*
	* 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 <dirent.h>
	#include <stdint.h>
	#include <string.h>
	#include <unistd.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <pthread.h>

	#include <linux/input.h>

	#include <sys/ioctl.h>
	#include <sys/poll.h>
	#include <sys/types.h>

	#include <hardware/lights.h>

	#define LIGHT_ATTENTION 1
	#define LIGHT_NOTIFY 2

	/******************************************************************************/


	static struct light_state_t *g_notify;
	static struct light_state_t *g_attention;
	static pthread_once_t g_init = PTHREAD_ONCE_INIT;
	static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;

	/**
	* device methods
	*/

	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) {
	LOGE("write_int failed to open %s\n", path);
	already_warned = 1;
	}
	return -errno;
	}
	}

	static int write_string(char const path, char const value)
	{
	int fd;
	static int already_warned = -1;
	fd = open(path, O_RDWR);
	if (fd >= 0) {
	char buffer[20];
	int bytes = sprintf(buffer, "%s\n", value);
	int amt = write(fd, buffer, bytes);
	close(fd);
	return amt == -1 ? -errno : 0;
	} else {
	if (already_warned == -1) {
	LOGE("write_int failed to open %s\n", path);
	already_warned = 1;
	}
	return -errno;
	}
	}

	void init_globals(void)
	{
	pthread_mutex_init(&g_lock, NULL);

	g_attention = malloc(sizeof(struct light_state_t));
	memset(g_attention, 0, sizeof(*g_attention));
	g_notify = malloc(sizeof(struct light_state_t));
	memset(g_notify, 0, sizeof(*g_notify));
	}

	static int rgb_to_brightness(struct light_state_t const *state)
	{
	/* use max of the RGB components for brightness */
	int color = state->color & 0x00ffffff;
	int red = (color >> 16) & 0x000000ff;
	int green = (color >> 8) & 0x000000ff;
	int blue = color & 0x000000ff;

	int brightness = red;
	if (green > brightness)
	brightness = green;
	if (blue > brightness)
	brightness = blue;

	return brightness;
	}

	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("/sys/class/leds/lcd-backlight/brightness", brightness);
	pthread_mutex_unlock(&g_lock);

	return err;
	}

	static int
	set_notification_light(struct light_state_t const* state)
	{
	unsigned int brightness = rgb_to_brightness(state);
	int blink = state->flashOnMS;

	ALOGD("set_notification_light colorRGB=%08X, onMS=%d, offMS=%d\n",
	state->color, state->flashOnMS, state->flashOffMS);

	write_int("/sys/class/leds/notification-led/brightness", brightness);
	write_int("/sys/class/leds/notification-led/blink", blink);

	return 0;
	}

	static void
	handle_notification_light_locked(int type)
	{
	struct light_state_t *new_state = 0;
	int attn_mode = 0;

	if (g_attention->flashMode == LIGHT_FLASH_HARDWARE)
	attn_mode = g_attention->flashOnMS;

	switch (type) {
	case LIGHT_ATTENTION: {
	if (attn_mode == 0) {
	/* go back to notify state */
	new_state = g_notify;
	} else {
	new_state = g_attention;
	}
	break;
	}
	case LIGHT_NOTIFY: {
	if (attn_mode != 0) {
	/* attention takes priority over notify state */
	new_state = g_attention;
	} else {
	new_state = g_notify;
	}
	break;
	}
	}
	if (new_state == 0) {
	LOGE("%s: unknown type (%d)\n", __func__, type);
	return;
	}

	set_notification_light(new_state);
	}

	static int
	set_light_notifications(struct light_device_t* dev,
	struct light_state_t const* state)
	{
	pthread_mutex_lock(&g_lock);

	g_notify->color = state->color;
	if (state->flashMode != LIGHT_FLASH_NONE) {
	g_notify->flashMode = LIGHT_FLASH_HARDWARE;
	g_notify->flashOnMS = state->flashOnMS;
	g_notify->flashOffMS = state->flashOffMS;
	} else {
	g_notify->flashOnMS = 0;
	g_notify->flashOffMS = 0;
	}
	handle_notification_light_locked(LIGHT_NOTIFY);

	pthread_mutex_unlock(&g_lock);
	return 0;
	}

	static int
	set_light_attention(struct light_device_t* dev,
	struct light_state_t const* state)
	{
	pthread_mutex_lock(&g_lock);

	g_attention->flashMode = state->flashMode;
	g_attention->flashOnMS = state->flashOnMS;
	g_attention->color = state->color;
	g_attention->flashOffMS = 0;
	handle_notification_light_locked(LIGHT_ATTENTION);

	pthread_mutex_unlock(&g_lock);
	return 0;
	}

	/** Close the lights device */
	static int close_lights(struct light_device_t *dev)
	{
	if (dev)
	free(dev);
	return 0;
	}

	/******************************************************************************/

	/**
	* module methods
	*/

	/** 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_NOTIFICATIONS, name))
	set_light = set_light_notifications;
	else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
	set_light = set_light_attention;
	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,
	};

	/*
	* The lights Module
	*/
	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 = "Nvidia lights Module",
	.author = "Motorola, Inc.",
	.methods = &lights_module_methods,
	};