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android_hardware_samsung/exynos4/exynos4x12/liblights/lights.c

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/*
* Copyright (C) 2012 The Android Open Source Project
* The CyanogenMod Project
* Daniel Hillenbrand <codeworkx@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"
//#define LOG_NDEBUG 0
#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>
/******************************************************************************/
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
char const*const PANEL_FILE = "/sys/class/backlight/panel/brightness";
char const*const BUTTON_FILE = "/sys/class/sec/sec_touchkey/brightness";
char const*const LED_RED = "/sys/class/sec/led/led_r";
char const*const LED_GREEN = "/sys/class/sec/led/led_g";
char const*const LED_BLUE = "/sys/class/sec/led/led_b";
char const*const LED_BLINK = "/sys/class/sec/led/led_blink";
char const*const LED_BRIGHTNESS = "/sys/class/sec/led/led_br_lev";
#define MAX_WRITE_CMD 25
struct led_config {
int red;
int green;
int blue;
char blink[MAX_WRITE_CMD];
};
static struct light_state_t g_BatteryStore;
static struct light_state_t g_AttentionStore;
static struct light_state_t g_NotificationStore;
static int
is_lit(struct light_state_t const* state)
{
return state->color & 0x00ffffff;
}
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 read_int(char const *path)
{
int fd;
char buffer[2];
fd = open(path, O_RDONLY);
if (fd >= 0) {
read(fd, buffer, 1);
}
close(fd);
return atoi(buffer);
}
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) {
char buffer[MAX_WRITE_CMD];
int bytes = sprintf(buffer, "%s\n", value);
int amt = write(fd, buffer, bytes);
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 & 0x00ffffff;
return ((77*((color>>16) & 0x00ff))
+ (150*((color>>8) & 0x00ff)) + (29*(color & 0x00ff))) >> 8;
}
static int get_dimmed_color(struct light_state_t const *state, int brightness)
{
int red = (state->color >> 16) & 0xFF;
int green = ((state->color >> 8) & 0xFF) * 0.7;
int blue = (state->color & 0x00FF) * 0.7;
return (((red * brightness) / 255) << 16) + (((green * brightness) / 255) << 8) + ((blue * brightness) / 255);
}
/* Panel backlight */
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(PANEL_FILE, brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
/* Touchkey backlight */
static int
set_light_buttons(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);
ALOGD("set_light_buttons: %d\n", brightness > 0 ? 1 : 2);
err = write_int(BUTTON_FILE, brightness > 0 ? 1 : 2);
pthread_mutex_unlock(&g_lock);
return err;
}
/* LEDs */
static int write_leds(struct led_config led)
{
int err = 0;
pthread_mutex_lock(&g_lock);
err = write_int(LED_RED, led.red);
err = write_int(LED_GREEN, led.green);
err = write_int(LED_BLUE, led.blue);
err = write_str(LED_BLINK, led.blink);
pthread_mutex_unlock(&g_lock);
return err;
}
static int set_light_leds(struct light_state_t const *state)
{
struct led_config led;
struct light_state_t *activeState;
int onMS, offMS;
unsigned int colorRGB;
if (is_lit(&g_AttentionStore)) {
activeState = &g_AttentionStore;
colorRGB = get_dimmed_color(activeState, 200);
} else {
if (is_lit(&g_BatteryStore) && !is_lit(&g_NotificationStore)) {
activeState = &g_BatteryStore;
colorRGB = get_dimmed_color(activeState, 20);
} else {
activeState = &g_NotificationStore;
colorRGB = get_dimmed_color(activeState, 200);
}
}
switch (activeState->flashMode) {
case LIGHT_FLASH_TIMED:
onMS = activeState->flashOnMS;
offMS = activeState->flashOffMS;
break;
case LIGHT_FLASH_HARDWARE:
case LIGHT_FLASH_NONE:
default:
onMS = 0;
offMS = 0;
break;
}
led.red = (colorRGB >> 16) & 0xFF;
led.green = (colorRGB >> 8) & 0xFF;
led.blue = colorRGB & 0xFF;
snprintf(led.blink, MAX_WRITE_CMD, "0x%x %d %d", colorRGB, onMS, offMS);
ALOGD("set_light_leds 0x%x %d %d", colorRGB, onMS, offMS);
return write_leds(led);
}
static int set_light_leds_notifications(struct light_device_t *dev,
struct light_state_t const *state)
{
g_NotificationStore = *state;
return set_light_leds(state);
}
static int set_light_battery(struct light_device_t *dev,
struct light_state_t const *state)
{
g_BatteryStore = *state;
return set_light_leds(state);
}
static int set_light_leds_attention(struct light_device_t *dev,
struct light_state_t const *state)
{
g_AttentionStore = *state;
return set_light_leds(state);
}
static int close_lights(struct light_device_t *dev)
{
ALOGV("close_light is called");
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;
#if !defined(EXYNOS4X12_TABLET) || defined(EXYNOS4X12_TABLET_HAS_LED_BUTTONS)
else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
set_light = set_light_buttons;
#endif
#ifndef EXYNOS4X12_TABLET
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 if (0 == strcmp(LIGHT_ID_BATTERY, name))
set_light = set_light_battery;
#endif
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 = "Exynos4x12 lights Module",
.author = "The CyanogenMod Project",
.methods = &lights_module_methods,
};
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