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/*
* 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 <stdint.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
#include <linux/leds-an30259a.h>
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
char const *const LCD_FILE = "/sys/class/backlight/s6e8aa0/brightness";
char const *const LED_FILE = "/dev/an30259a_leds";
#define IMAX 0 // 12.75mA power consumption
// Slope values, based on total blink of 1000ms
#define SLOPE_UP_1 450
#define SLOPE_UP_2 (500-SLOPE_UP_1)
#define SLOPE_DOWN_1 SLOPE_UP_2
#define SLOPE_DOWN_2 SLOPE_UP_1
// brightness at mid-slope, on 0 - 127 scale
#define MID_BRIGHTNESS 31
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 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 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(LCD_FILE, 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(struct an30259a_pr_control *led)
{
int err = 0;
int imax = IMAX;
int fd;
pthread_mutex_lock(&g_lock);
fd = open(LED_FILE, O_RDWR);
if (fd >= 0) {
err = ioctl(fd, AN30259A_PR_SET_IMAX, &imax);
if (err)
ALOGE("failed to set imax");
err = ioctl(fd, AN30259A_PR_SET_LED, led);
if (err < 0)
ALOGE("failed to set leds!");
close(fd);
} else {
ALOGE("failed to open %s!", LED_FILE);
err = -errno;
}
pthread_mutex_unlock(&g_lock);
return err;
}
static int set_light_leds(struct light_state_t const *state, int type)
{
struct an30259a_pr_control led;
memset(&led, 0, sizeof(led));
switch (state->flashMode) {
case LIGHT_FLASH_NONE:
led.state = LED_LIGHT_OFF;
break;
case LIGHT_FLASH_TIMED:
case LIGHT_FLASH_HARDWARE:
led.state = LED_LIGHT_SLOPE;
led.color = state->color & 0x00ffffff;
// tweak to eliminate purplish tint from white color
if (led.color == 0x00ffffff)
led.color = 0x80ff80;
// scale slope times based on flashOnMS
led.time_slope_up_1 = (SLOPE_UP_1 * state->flashOnMS) / 1000;
led.time_slope_up_2 = (SLOPE_UP_2 * state->flashOnMS) / 1000;
led.time_slope_down_1 = (SLOPE_DOWN_1 * state->flashOnMS) / 1000;
led.time_slope_down_2 = (SLOPE_DOWN_2 * state->flashOnMS) / 1000;
led.mid_brightness = MID_BRIGHTNESS;
led.time_off = state->flashOffMS;
break;
default:
return -EINVAL;
}
return write_leds(&led);
}
static int set_light_leds_notifications(struct light_device_t *dev,
struct light_state_t const *state)
{
return set_light_leds(state, 0);
}
static int set_light_leds_attention(struct light_device_t *dev,
struct light_state_t const *state)
{
return set_light_leds(state, 1);
}
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_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 = "lights Module",
.author = "Google, Inc.",
.methods = &lights_module_methods,
};
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