liblights/lights.c - LeafOS-Devices/android_hardware_samsung - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  * Copyright (C) 2015-2016 The CyanogenMod Project
  * Copyright (C) 2017 The LineageOS 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 "SamsungLightsHAL"
 /* #define LOG_NDEBUG 0 */

 #include <cutils/log.h>
 #include <stdlib.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 <liblights/samsung_lights_helper.h>

 #include "samsung_lights.h"

 #define COLOR_MASK 0x00ffffff

 #define MAX_INPUT_BRIGHTNESS 255

 enum component_mask_t {
     COMPONENT_BACKLIGHT = 0x1,
     COMPONENT_BUTTON_LIGHT = 0x2,
     COMPONENT_LED = 0x4,
     COMPONENT_BLN = 0x8,
 };

 enum light_t {
     TYPE_BATTERY = 0,
     TYPE_NOTIFICATION = 1,
     TYPE_ATTENTION = 2,
 };

 // Assume backlight is always supported
 static int hw_components = COMPONENT_BACKLIGHT;

 static pthread_once_t g_init = PTHREAD_ONCE_INIT;
 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;

 struct backlight_config {
     int cur_brightness, max_brightness;
 };

 struct led_config {
     unsigned int color;
     int delay_on, delay_off;
 };

 static struct backlight_config g_backlight; // For panel backlight
 static struct led_config g_leds[3]; // For battery, notifications, and attention.
 static int g_cur_led = -1;          // Presently showing LED of the above.

 void check_component_support()
 {
     if (access(BUTTON_BRIGHTNESS_NODE, W_OK) == 0)
         hw_components |= COMPONENT_BUTTON_LIGHT;
     if (access(LED_BLINK_NODE, W_OK) == 0)
         hw_components |= COMPONENT_LED;
 #ifdef LED_BLN_NODE
     if (access(LED_BLN_NODE, W_OK) == 0)
         hw_components |= COMPONENT_BLN;
 #endif
 }

 void init_g_lock(void)
 {
     pthread_mutex_init(&g_lock, NULL);
 }

 static int write_str(char const *path, const char* value)
 {
     int fd;
     static int already_warned;

     already_warned = 0;

     ALOGV("write_str: path %s, value %s", path, value);
     fd = open(path, O_RDWR);

     if (fd >= 0) {
         int amt = write(fd, value, strlen(value));
         close(fd);
         return amt == -1 ? -errno : 0;
     } else {
         if (already_warned == 0) {
             ALOGE("write_str failed to open %s", path);
             already_warned = 1;
         }
         return -errno;
     }
 }

 static int rgb_to_brightness(struct light_state_t const *state)
 {
     int color = state->color & COLOR_MASK;

     return ((77*((color>>16) & 0x00ff))
         + (150*((color>>8) & 0x00ff)) + (29*(color & 0x00ff))) >> 8;
 }

 static int set_light_backlight(struct light_device_t *dev __unused,
                                struct light_state_t const *state)
 {
     int err = 0;
     int brightness = rgb_to_brightness(state);
     int max_brightness = g_backlight.max_brightness;

     /*
      * If max panel brightness is not the default (255),
      * apply linear scaling across the accepted range.
      */
     if (max_brightness != MAX_INPUT_BRIGHTNESS) {
         int old_brightness = brightness;
         brightness = brightness * max_brightness / MAX_INPUT_BRIGHTNESS;
         ALOGV("%s: scaling brightness %d => %d", __func__,
             old_brightness, brightness);
     }

     pthread_mutex_lock(&g_lock);
     err = set_cur_panel_brightness(brightness);
     if (err == 0)
         g_backlight.cur_brightness = brightness;

     pthread_mutex_unlock(&g_lock);
     return err;
 }

 static int set_light_buttons(struct light_device_t* dev __unused,
                              struct light_state_t const* state)
 {
     int err = 0;
     pthread_mutex_lock(&g_lock);
     int brightness = (state->color & COLOR_MASK) ? 1 : 0;

 #ifdef VAR_BUTTON_BRIGHTNESS
     brightness = rgb_to_brightness(state);
 #endif
     err = set_cur_button_brightness(brightness);
     pthread_mutex_unlock(&g_lock);

     return err;
 }

 static int close_lights(struct light_device_t *dev)
 {
     ALOGV("close_light is called");
     if (dev)
         free(dev);

     return 0;
 }

 /* LEDs */
 static int write_leds(const struct led_config *led)
 {
     static const struct led_config led_off = {0, 0, 0};

     char blink[32];
     int count, err;
     int color;

     if (led == NULL)
         led = &led_off;

     count = snprintf(blink,
                      sizeof(blink) - 1,
                      "0x%08x %d %d",
                      led->color,
                      led->delay_on,
                      led->delay_off);
     if (count < 0) {
         return -errno;
     } else if ((unsigned int)count >= sizeof(blink)-1) {
         ALOGE("%s: Truncated string: blink=\"%s\".", __func__, blink);
         return -EINVAL;
     }

     ALOGV("%s: color=0x%08x, delay_on=%d, delay_off=%d, blink=%s",
           __func__, led->color, led->delay_on, led->delay_off, blink);

     /* Add '\n' here to make the above log message clean. */
     blink[count]   = '\n';
     blink[count+1] = '\0';

     pthread_mutex_lock(&g_lock);
     err = write_str(LED_BLINK_NODE, blink);
     pthread_mutex_unlock(&g_lock);

     return err;
 }

 static int calibrate_color(int color, int brightness)
 {
     int red = ((color >> 16) & 0xFF) * LED_ADJUSTMENT_R;
     int green = ((color >> 8) & 0xFF) * LED_ADJUSTMENT_G;
     int blue = (color & 0xFF) * LED_ADJUSTMENT_B;

     return (((red * brightness) / 255) << 16) + (((green * brightness) / 255) << 8) + ((blue * brightness) / 255);
 }

 static int set_light_leds(struct light_state_t const *state, int type)
 {
     struct led_config *led;
     int err = 0;
     int adjusted_brightness;

     ALOGV("%s: type=%d, color=0x%010x, fM=%d, fOnMS=%d, fOffMs=%d.", __func__,
           type, state->color,state->flashMode, state->flashOnMS, state->flashOffMS);

     if (type < 0 || (size_t)type >= sizeof(g_leds)/sizeof(g_leds[0])) {
         return -EINVAL;
     }

     /* type is one of:
      *   0. battery
      *   1. notifications
      *   2. attention
      * which are multiplexed onto the same physical LED in the above order. */
     led = &g_leds[type];

     switch (state->flashMode) {
     case LIGHT_FLASH_NONE:
         /* Set LED to a solid color, spec is unclear on the exact behavior here. */
         led->delay_on = led->delay_off = 0;
         break;
     case LIGHT_FLASH_TIMED:
     case LIGHT_FLASH_HARDWARE:
         led->delay_on  = state->flashOnMS;
         led->delay_off = state->flashOffMS;
         break;
     default:
         return -EINVAL;
     }

     switch (type) {
     case TYPE_BATTERY:
         adjusted_brightness = LED_BRIGHTNESS_BATTERY;
         break;
     case TYPE_NOTIFICATION:
         adjusted_brightness = LED_BRIGHTNESS_NOTIFICATION;
         break;
     case TYPE_ATTENTION:
         adjusted_brightness = LED_BRIGHTNESS_ATTENTION;
         break;
     default:
         adjusted_brightness = 255;
     }


     led->color = calibrate_color(state->color & COLOR_MASK, adjusted_brightness);

     if (led->color > 0) {
         /* This LED is lit. */
         if (type >= g_cur_led) {
             /* And it has the highest priority, so show it. */
             err = write_leds(led);
             g_cur_led = type;
         }
     } else {
         /* This LED is not (any longer) lit. */
         if (type == g_cur_led) {
             /* But it is currently showing, switch to a lower-priority LED. */
             int i;

             for (i = type-1; i >= 0; i--) {
                 if (g_leds[i].color > 0) {
                     /* Found a lower-priority LED to switch to. */
                     err = write_leds(&g_leds[i]);
                     goto switched;
                 }
             }

             /* No LEDs are lit, turn off. */
             err = write_leds(NULL);
 switched:
             g_cur_led = i;
         }
     }

     return err;
 }

 #ifdef LED_BLN_NODE
 static int set_light_bln_notifications(struct light_device_t *dev __unused,
                                   struct light_state_t const *state)
 {
     int err = 0;

     pthread_mutex_lock(&g_lock);
     err = write_str(LED_BLN_NODE, state->color & COLOR_MASK ? "1" : "0");
     pthread_mutex_unlock(&g_lock);

     return err;
 }
 #endif
 static int set_light_leds_battery(struct light_device_t *dev __unused,
                                   struct light_state_t const *state)
 {
     return set_light_leds(state, TYPE_BATTERY);
 }

 static int set_light_leds_notifications(struct light_device_t *dev __unused,
                                         struct light_state_t const *state)
 {
     return set_light_leds(state, TYPE_NOTIFICATION);
 }

 static int set_light_leds_attention(struct light_device_t *dev __unused,
                                     struct light_state_t const *state)
 {
     struct light_state_t fixed;

     memcpy(&fixed, state, sizeof(fixed));

     /* The framework does odd things with the attention lights, fix them up to
      * do something sensible here. */
     switch (fixed.flashMode) {
     case LIGHT_FLASH_NONE:
         /* LightsService.Light::stopFlashing calls with non-zero color. */
         fixed.color = 0;
         break;
     case LIGHT_FLASH_HARDWARE:
         /* PowerManagerService::setAttentionLight calls with onMS=3, offMS=0, which
          * just makes for a slightly-dimmer LED. */
         if (fixed.flashOnMS > 0 && fixed.flashOffMS == 0)
             fixed.flashMode = LIGHT_FLASH_NONE;
             fixed.color = 0x000000ff;
         break;
     }

     return set_light_leds(&fixed, TYPE_ATTENTION);
 }

 static int open_lights(const struct hw_module_t *module, char const *name,
                         struct hw_device_t **device)
 {
     int requested_component;
     int (*set_light)(struct light_device_t *dev,
         struct light_state_t const *state);

     check_component_support();

     if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {
         requested_component = COMPONENT_BACKLIGHT;
         set_light = set_light_backlight;
     } else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
         requested_component = COMPONENT_BUTTON_LIGHT;
         set_light = set_light_buttons;
     } else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
         requested_component = COMPONENT_LED;
         set_light = set_light_leds_battery;
     } else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
         requested_component = COMPONENT_LED;
         set_light = set_light_leds_notifications;
 #ifdef LED_BLN_NODE
         if (hw_components & COMPONENT_BLN) {
             requested_component = COMPONENT_BLN;
             set_light = set_light_bln_notifications;
         }
 #endif
     } else if (0 == strcmp(LIGHT_ID_ATTENTION, name)) {
         requested_component = COMPONENT_LED;
         set_light = set_light_leds_attention;
     } else {
         return -EINVAL;
     }

     if ((hw_components & requested_component) == 0) {
         ALOGV("%s: component 0x%x not supported by device", __func__,
             requested_component);
         return -EINVAL;
     }

     int max_brightness = get_max_panel_brightness();
     if (max_brightness < 0) {
         ALOGE("%s: failed to read max panel brightness, fallback to 255!",
             __func__);
         max_brightness = 255;
     }
     g_backlight.max_brightness = max_brightness;

     pthread_once(&g_init, init_g_lock);

     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 = "Samsung Lights Module",
     .author = "The CyanogenMod Project",
     .methods = &lights_module_methods,
 };
	/*
	* Copyright (C) 2013 The Android Open Source Project
	* Copyright (C) 2015-2016 The CyanogenMod Project
	* Copyright (C) 2017 The LineageOS 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 "SamsungLightsHAL"
	/* #define LOG_NDEBUG 0 */

	#include <cutils/log.h>
	#include <stdlib.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 <liblights/samsung_lights_helper.h>

	#include "samsung_lights.h"

	#define COLOR_MASK 0x00ffffff

	#define MAX_INPUT_BRIGHTNESS 255

	enum component_mask_t {
	COMPONENT_BACKLIGHT = 0x1,
	COMPONENT_BUTTON_LIGHT = 0x2,
	COMPONENT_LED = 0x4,
	COMPONENT_BLN = 0x8,
	};

	enum light_t {
	TYPE_BATTERY = 0,
	TYPE_NOTIFICATION = 1,
	TYPE_ATTENTION = 2,
	};

	// Assume backlight is always supported
	static int hw_components = COMPONENT_BACKLIGHT;

	static pthread_once_t g_init = PTHREAD_ONCE_INIT;
	static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;

	struct backlight_config {
	int cur_brightness, max_brightness;
	};

	struct led_config {
	unsigned int color;
	int delay_on, delay_off;
	};

	static struct backlight_config g_backlight; // For panel backlight
	static struct led_config g_leds[3]; // For battery, notifications, and attention.
	static int g_cur_led = -1; // Presently showing LED of the above.

	void check_component_support()
	{
	if (access(BUTTON_BRIGHTNESS_NODE, W_OK) == 0)
	hw_components \|= COMPONENT_BUTTON_LIGHT;
	if (access(LED_BLINK_NODE, W_OK) == 0)
	hw_components \|= COMPONENT_LED;
	#ifdef LED_BLN_NODE
	if (access(LED_BLN_NODE, W_OK) == 0)
	hw_components \|= COMPONENT_BLN;
	#endif
	}

	void init_g_lock(void)
	{
	pthread_mutex_init(&g_lock, NULL);
	}

	static int write_str(char const path, const char value)
	{
	int fd;
	static int already_warned;

	already_warned = 0;

	ALOGV("write_str: path %s, value %s", path, value);
	fd = open(path, O_RDWR);

	if (fd >= 0) {
	int amt = write(fd, value, strlen(value));
	close(fd);
	return amt == -1 ? -errno : 0;
	} else {
	if (already_warned == 0) {
	ALOGE("write_str failed to open %s", path);
	already_warned = 1;
	}
	return -errno;
	}
	}

	static int rgb_to_brightness(struct light_state_t const *state)
	{
	int color = state->color & COLOR_MASK;

	return ((77*((color>>16) & 0x00ff))
	+ (150((color>>8) & 0x00ff)) + (29(color & 0x00ff))) >> 8;
	}

	static int set_light_backlight(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	int err = 0;
	int brightness = rgb_to_brightness(state);
	int max_brightness = g_backlight.max_brightness;

	/*
	* If max panel brightness is not the default (255),
	* apply linear scaling across the accepted range.
	*/
	if (max_brightness != MAX_INPUT_BRIGHTNESS) {
	int old_brightness = brightness;
	brightness = brightness * max_brightness / MAX_INPUT_BRIGHTNESS;
	ALOGV("%s: scaling brightness %d => %d", __func__,
	old_brightness, brightness);
	}

	pthread_mutex_lock(&g_lock);
	err = set_cur_panel_brightness(brightness);
	if (err == 0)
	g_backlight.cur_brightness = brightness;

	pthread_mutex_unlock(&g_lock);
	return err;
	}

	static int set_light_buttons(struct light_device_t* dev __unused,
	struct light_state_t const* state)
	{
	int err = 0;
	pthread_mutex_lock(&g_lock);
	int brightness = (state->color & COLOR_MASK) ? 1 : 0;

	#ifdef VAR_BUTTON_BRIGHTNESS
	brightness = rgb_to_brightness(state);
	#endif
	err = set_cur_button_brightness(brightness);
	pthread_mutex_unlock(&g_lock);

	return err;
	}

	static int close_lights(struct light_device_t *dev)
	{
	ALOGV("close_light is called");
	if (dev)
	free(dev);

	return 0;
	}

	/* LEDs */
	static int write_leds(const struct led_config *led)
	{
	static const struct led_config led_off = {0, 0, 0};

	char blink[32];
	int count, err;
	int color;

	if (led == NULL)
	led = &led_off;

	count = snprintf(blink,
	sizeof(blink) - 1,
	"0x%08x %d %d",
	led->color,
	led->delay_on,
	led->delay_off);
	if (count < 0) {
	return -errno;
	} else if ((unsigned int)count >= sizeof(blink)-1) {
	ALOGE("%s: Truncated string: blink=\"%s\".", __func__, blink);
	return -EINVAL;
	}

	ALOGV("%s: color=0x%08x, delay_on=%d, delay_off=%d, blink=%s",
	__func__, led->color, led->delay_on, led->delay_off, blink);

	/* Add '\n' here to make the above log message clean. */
	blink[count] = '\n';
	blink[count+1] = '\0';

	pthread_mutex_lock(&g_lock);
	err = write_str(LED_BLINK_NODE, blink);
	pthread_mutex_unlock(&g_lock);

	return err;
	}

	static int calibrate_color(int color, int brightness)
	{
	int red = ((color >> 16) & 0xFF) * LED_ADJUSTMENT_R;
	int green = ((color >> 8) & 0xFF) * LED_ADJUSTMENT_G;
	int blue = (color & 0xFF) * LED_ADJUSTMENT_B;

	return (((red * brightness) / 255) << 16) + (((green * brightness) / 255) << 8) + ((blue * brightness) / 255);
	}

	static int set_light_leds(struct light_state_t const *state, int type)
	{
	struct led_config *led;
	int err = 0;
	int adjusted_brightness;

	ALOGV("%s: type=%d, color=0x%010x, fM=%d, fOnMS=%d, fOffMs=%d.", __func__,
	type, state->color,state->flashMode, state->flashOnMS, state->flashOffMS);

	if (type < 0 \|\| (size_t)type >= sizeof(g_leds)/sizeof(g_leds[0])) {
	return -EINVAL;
	}

	/* type is one of:
	* 0. battery
	* 1. notifications
	* 2. attention
	* which are multiplexed onto the same physical LED in the above order. */
	led = &g_leds[type];

	switch (state->flashMode) {
	case LIGHT_FLASH_NONE:
	/* Set LED to a solid color, spec is unclear on the exact behavior here. */
	led->delay_on = led->delay_off = 0;
	break;
	case LIGHT_FLASH_TIMED:
	case LIGHT_FLASH_HARDWARE:
	led->delay_on = state->flashOnMS;
	led->delay_off = state->flashOffMS;
	break;
	default:
	return -EINVAL;
	}

	switch (type) {
	case TYPE_BATTERY:
	adjusted_brightness = LED_BRIGHTNESS_BATTERY;
	break;
	case TYPE_NOTIFICATION:
	adjusted_brightness = LED_BRIGHTNESS_NOTIFICATION;
	break;
	case TYPE_ATTENTION:
	adjusted_brightness = LED_BRIGHTNESS_ATTENTION;
	break;
	default:
	adjusted_brightness = 255;
	}



	led->color = calibrate_color(state->color & COLOR_MASK, adjusted_brightness);

	if (led->color > 0) {
	/* This LED is lit. */
	if (type >= g_cur_led) {
	/* And it has the highest priority, so show it. */
	err = write_leds(led);
	g_cur_led = type;
	}
	} else {
	/* This LED is not (any longer) lit. */
	if (type == g_cur_led) {
	/* But it is currently showing, switch to a lower-priority LED. */
	int i;

	for (i = type-1; i >= 0; i--) {
	if (g_leds[i].color > 0) {
	/* Found a lower-priority LED to switch to. */
	err = write_leds(&g_leds[i]);
	goto switched;
	}
	}

	/* No LEDs are lit, turn off. */
	err = write_leds(NULL);
	switched:
	g_cur_led = i;
	}
	}

	return err;
	}

	#ifdef LED_BLN_NODE
	static int set_light_bln_notifications(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	int err = 0;

	pthread_mutex_lock(&g_lock);
	err = write_str(LED_BLN_NODE, state->color & COLOR_MASK ? "1" : "0");
	pthread_mutex_unlock(&g_lock);

	return err;
	}
	#endif
	static int set_light_leds_battery(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	return set_light_leds(state, TYPE_BATTERY);
	}

	static int set_light_leds_notifications(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	return set_light_leds(state, TYPE_NOTIFICATION);
	}

	static int set_light_leds_attention(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	struct light_state_t fixed;

	memcpy(&fixed, state, sizeof(fixed));

	/* The framework does odd things with the attention lights, fix them up to
	* do something sensible here. */
	switch (fixed.flashMode) {
	case LIGHT_FLASH_NONE:
	/* LightsService.Light::stopFlashing calls with non-zero color. */
	fixed.color = 0;
	break;
	case LIGHT_FLASH_HARDWARE:
	/* PowerManagerService::setAttentionLight calls with onMS=3, offMS=0, which
	* just makes for a slightly-dimmer LED. */
	if (fixed.flashOnMS > 0 && fixed.flashOffMS == 0)
	fixed.flashMode = LIGHT_FLASH_NONE;
	fixed.color = 0x000000ff;
	break;
	}

	return set_light_leds(&fixed, TYPE_ATTENTION);
	}

	static int open_lights(const struct hw_module_t module, char const name,
	struct hw_device_t **device)
	{
	int requested_component;
	int (set_light)(struct light_device_t dev,
	struct light_state_t const *state);

	check_component_support();

	if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {
	requested_component = COMPONENT_BACKLIGHT;
	set_light = set_light_backlight;
	} else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
	requested_component = COMPONENT_BUTTON_LIGHT;
	set_light = set_light_buttons;
	} else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
	requested_component = COMPONENT_LED;
	set_light = set_light_leds_battery;
	} else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
	requested_component = COMPONENT_LED;
	set_light = set_light_leds_notifications;
	#ifdef LED_BLN_NODE
	if (hw_components & COMPONENT_BLN) {
	requested_component = COMPONENT_BLN;
	set_light = set_light_bln_notifications;
	}
	#endif
	} else if (0 == strcmp(LIGHT_ID_ATTENTION, name)) {
	requested_component = COMPONENT_LED;
	set_light = set_light_leds_attention;
	} else {
	return -EINVAL;
	}

	if ((hw_components & requested_component) == 0) {
	ALOGV("%s: component 0x%x not supported by device", __func__,
	requested_component);
	return -EINVAL;
	}

	int max_brightness = get_max_panel_brightness();
	if (max_brightness < 0) {
	ALOGE("%s: failed to read max panel brightness, fallback to 255!",
	__func__);
	max_brightness = 255;
	}
	g_backlight.max_brightness = max_brightness;

	pthread_once(&g_init, init_g_lock);

	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 = "Samsung Lights Module",
	.author = "The CyanogenMod Project",
	.methods = &lights_module_methods,
	};