liblights/lights.c - platform_hardware_samsung - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  * Copyright (C) 2015 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 "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>

 #define PANEL_FILE "/sys/class/backlight/panel/brightness"
 #define BUTTON_FILE "/sys/class/sec/sec_touchkey/brightness"
 #define LED_BLINK "/sys/class/sec/led/led_blink"

 #define COLOR_MASK 0x00ffffff

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

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

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

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

     already_warned = 0;

     ALOGV("write_int: path %s, value %d", path, value);
     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 == 0) {
             ALOGE("write_int failed to open %s\n", path);
             already_warned = 1;
         }
         return -errno;
     }
 }

 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\n", 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);

     pthread_mutex_lock(&g_lock);
     err = write_int(PANEL_FILE, 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;
     int on = (state->color & COLOR_MASK);

     pthread_mutex_lock(&g_lock);

     err = write_int(BUTTON_FILE, on ? 1 : 0);

     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, blink);
     pthread_mutex_unlock(&g_lock);

     return err;
 }

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

     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;
     }

     led->color = state->color & COLOR_MASK;

     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;
 }

 static int set_light_leds_battery(struct light_device_t *dev __unused,
                                   struct light_state_t const *state)
 {
     return set_light_leds(state, 0);
 }

 static int set_light_leds_notifications(struct light_device_t *dev __unused,
                                         struct light_state_t const *state)
 {
     return set_light_leds(state, 1);
 }

 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, 2);
 }

 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_leds_battery;
     else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
         set_light = set_light_leds_notifications;
     else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
         set_light = set_light_leds_attention;
     else
         return -EINVAL;

     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 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 "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>

	#define PANEL_FILE "/sys/class/backlight/panel/brightness"
	#define BUTTON_FILE "/sys/class/sec/sec_touchkey/brightness"
	#define LED_BLINK "/sys/class/sec/led/led_blink"

	#define COLOR_MASK 0x00ffffff

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

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

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

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

	already_warned = 0;

	ALOGV("write_int: path %s, value %d", path, value);
	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 == 0) {
	ALOGE("write_int failed to open %s\n", path);
	already_warned = 1;
	}
	return -errno;
	}
	}

	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\n", 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);

	pthread_mutex_lock(&g_lock);
	err = write_int(PANEL_FILE, 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;
	int on = (state->color & COLOR_MASK);

	pthread_mutex_lock(&g_lock);

	err = write_int(BUTTON_FILE, on ? 1 : 0);

	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, blink);
	pthread_mutex_unlock(&g_lock);

	return err;
	}

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

	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;
	}

	led->color = state->color & COLOR_MASK;

	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;
	}

	static int set_light_leds_battery(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	return set_light_leds(state, 0);
	}

	static int set_light_leds_notifications(struct light_device_t *dev __unused,
	struct light_state_t const *state)
	{
	return set_light_leds(state, 1);
	}

	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, 2);
	}

	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_leds_battery;
	else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
	set_light = set_light_leds_notifications;
	else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
	set_light = set_light_leds_attention;
	else
	return -EINVAL;

	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,
	};