417 lines
11 KiB
C
417 lines
11 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* Copyright (C) 2014 The Linux Foundation. All rights reserved.
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* Copyright (C) 2015 The CyanogenMod Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "lights"
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#include <cutils/log.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <hardware/lights.h>
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/******************************************************************************/
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static pthread_once_t g_init = PTHREAD_ONCE_INIT;
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static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
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static struct light_state_t g_attention;
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static struct light_state_t g_notification;
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static struct light_state_t g_battery;
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char const*const RED_LED_FILE
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= "/sys/class/leds/red/brightness";
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char const*const GREEN_LED_FILE
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= "/sys/class/leds/green/brightness";
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char const*const BLUE_LED_FILE
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= "/sys/class/leds/blue/brightness";
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char const*const LCD_FILE
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= "/sys/class/leds/lcd-backlight/brightness";
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char const*const RED_DUTY_PCTS_FILE
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= "/sys/class/leds/red/duty_pcts";
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char const*const GREEN_DUTY_PCTS_FILE
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= "/sys/class/leds/green/duty_pcts";
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char const*const BLUE_DUTY_PCTS_FILE
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= "/sys/class/leds/blue/duty_pcts";
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char const*const RED_START_IDX_FILE
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= "/sys/class/leds/red/start_idx";
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char const*const GREEN_START_IDX_FILE
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= "/sys/class/leds/green/start_idx";
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char const*const BLUE_START_IDX_FILE
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= "/sys/class/leds/blue/start_idx";
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char const*const RED_PAUSE_LO_FILE
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= "/sys/class/leds/red/pause_lo";
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char const*const GREEN_PAUSE_LO_FILE
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= "/sys/class/leds/green/pause_lo";
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char const*const BLUE_PAUSE_LO_FILE
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= "/sys/class/leds/blue/pause_lo";
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char const*const RED_PAUSE_HI_FILE
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= "/sys/class/leds/red/pause_hi";
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char const*const GREEN_PAUSE_HI_FILE
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= "/sys/class/leds/green/pause_hi";
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char const*const BLUE_PAUSE_HI_FILE
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= "/sys/class/leds/blue/pause_hi";
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char const*const RED_RAMP_STEP_MS_FILE
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= "/sys/class/leds/red/ramp_step_ms";
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char const*const GREEN_RAMP_STEP_MS_FILE
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= "/sys/class/leds/green/ramp_step_ms";
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char const*const BLUE_RAMP_STEP_MS_FILE
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= "/sys/class/leds/blue/ramp_step_ms";
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char const*const RGB_BLINK_FILE
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= "/sys/class/leds/rgb/rgb_blink";
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#define RAMP_SIZE 8
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static int BRIGHTNESS_RAMP[RAMP_SIZE]
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= { 0, 12, 25, 37, 50, 72, 85, 100 };
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#define RAMP_STEP_DURATION 50
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/**
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* device methods
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*/
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void init_globals(void)
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{
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// init the mutex
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pthread_mutex_init(&g_lock, NULL);
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}
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static int
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write_int(char const* path, int value)
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{
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int fd;
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static int already_warned = 0;
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fd = open(path, O_RDWR);
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if (fd >= 0) {
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char buffer[20];
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int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);
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ssize_t amt = write(fd, buffer, (size_t)bytes);
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close(fd);
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return amt == -1 ? -errno : 0;
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} else {
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if (already_warned == 0) {
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ALOGE("write_int failed to open %s\n", path);
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already_warned = 1;
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}
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return -errno;
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}
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}
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static int
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write_str(char const* path, char* value)
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{
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int fd;
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static int already_warned = 0;
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fd = open(path, O_RDWR);
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if (fd >= 0) {
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char buffer[1024];
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int bytes = snprintf(buffer, sizeof(buffer), "%s\n", value);
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ssize_t amt = write(fd, buffer, (size_t)bytes);
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close(fd);
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return amt == -1 ? -errno : 0;
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} else {
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if (already_warned == 0) {
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ALOGE("write_int failed to open %s\n", path);
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already_warned = 1;
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}
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return -errno;
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}
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}
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static int
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is_lit(struct light_state_t const* state)
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{
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return state->color & 0x00ffffff;
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}
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static int
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rgb_to_brightness(struct light_state_t const* state)
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{
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int color = state->color & 0x00ffffff;
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return ((77*((color>>16)&0x00ff))
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+ (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
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}
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static int
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set_light_backlight(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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int err = 0;
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int brightness = rgb_to_brightness(state);
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if(!dev) {
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return -1;
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}
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pthread_mutex_lock(&g_lock);
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err = write_int(LCD_FILE, brightness);
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pthread_mutex_unlock(&g_lock);
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return err;
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}
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static char*
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get_scaled_duty_pcts(int brightness)
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{
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char *buf = malloc(5 * RAMP_SIZE * sizeof(char));
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char *pad = "";
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int i = 0;
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memset(buf, 0, 5 * RAMP_SIZE * sizeof(char));
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for (i = 0; i < RAMP_SIZE; i++) {
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char temp[5] = "";
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snprintf(temp, sizeof(temp), "%s%d", pad, (BRIGHTNESS_RAMP[i] * brightness / 255));
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strcat(buf, temp);
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pad = ",";
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}
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ALOGV("%s: brightness=%d duty=%s", __func__, brightness, buf);
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return buf;
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}
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static int
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set_speaker_light_locked(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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int red, green, blue, blink;
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int onMS, offMS, stepDuration, pauseHi;
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unsigned int colorRGB;
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char *duty;
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if(!dev) {
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return -1;
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}
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switch (state->flashMode) {
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case LIGHT_FLASH_TIMED:
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onMS = state->flashOnMS;
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offMS = state->flashOffMS;
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break;
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case LIGHT_FLASH_NONE:
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default:
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onMS = 0;
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offMS = 0;
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break;
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}
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colorRGB = state->color;
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ALOGV("set_speaker_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
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state->flashMode, colorRGB, onMS, offMS);
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red = (colorRGB >> 16) & 0xFF;
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green = (colorRGB >> 8) & 0xFF;
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blue = colorRGB & 0xFF;
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blink = onMS > 0 && offMS > 0;
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// disable all blinking to start
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write_int(RGB_BLINK_FILE, 0);
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if (blink) {
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stepDuration = RAMP_STEP_DURATION;
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pauseHi = onMS - (stepDuration * RAMP_SIZE * 2);
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if (stepDuration * RAMP_SIZE * 2 > onMS) {
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stepDuration = onMS / (RAMP_SIZE * 2);
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pauseHi = 0;
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}
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// red
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write_int(RED_START_IDX_FILE, 0);
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duty = get_scaled_duty_pcts(red);
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write_str(RED_DUTY_PCTS_FILE, duty);
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write_int(RED_PAUSE_LO_FILE, offMS);
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// The led driver is configured to ramp up then ramp
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// down the lut. This effectively doubles the ramp duration.
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write_int(RED_PAUSE_HI_FILE, pauseHi);
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write_int(RED_RAMP_STEP_MS_FILE, stepDuration);
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free(duty);
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// green
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write_int(GREEN_START_IDX_FILE, RAMP_SIZE);
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duty = get_scaled_duty_pcts(green);
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write_str(GREEN_DUTY_PCTS_FILE, duty);
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write_int(GREEN_PAUSE_LO_FILE, offMS);
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// The led driver is configured to ramp up then ramp
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// down the lut. This effectively doubles the ramp duration.
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write_int(GREEN_PAUSE_HI_FILE, pauseHi);
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write_int(GREEN_RAMP_STEP_MS_FILE, stepDuration);
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free(duty);
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// blue
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write_int(BLUE_START_IDX_FILE, RAMP_SIZE * 2);
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duty = get_scaled_duty_pcts(blue);
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write_str(BLUE_DUTY_PCTS_FILE, duty);
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write_int(BLUE_PAUSE_LO_FILE, offMS);
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// The led driver is configured to ramp up then ramp
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// down the lut. This effectively doubles the ramp duration.
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write_int(BLUE_PAUSE_HI_FILE, pauseHi);
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write_int(BLUE_RAMP_STEP_MS_FILE, stepDuration);
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free(duty);
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// start the party
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write_int(RGB_BLINK_FILE, 1);
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} else {
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write_int(RED_LED_FILE, red);
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write_int(GREEN_LED_FILE, green);
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write_int(BLUE_LED_FILE, blue);
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}
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return 0;
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}
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static void
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handle_speaker_light_locked(struct light_device_t* dev)
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{
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if (is_lit(&g_attention)) {
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set_speaker_light_locked(dev, &g_attention);
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} else if (is_lit(&g_notification)) {
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set_speaker_light_locked(dev, &g_notification);
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} else {
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set_speaker_light_locked(dev, &g_battery);
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}
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}
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static int
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set_light_battery(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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pthread_mutex_lock(&g_lock);
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g_battery = *state;
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handle_speaker_light_locked(dev);
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pthread_mutex_unlock(&g_lock);
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return 0;
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}
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static int
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set_light_notifications(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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pthread_mutex_lock(&g_lock);
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g_notification = *state;
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handle_speaker_light_locked(dev);
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pthread_mutex_unlock(&g_lock);
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return 0;
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}
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static int
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set_light_attention(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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pthread_mutex_lock(&g_lock);
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g_attention = *state;
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handle_speaker_light_locked(dev);
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pthread_mutex_unlock(&g_lock);
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return 0;
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}
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/** Close the lights device */
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static int
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close_lights(struct light_device_t *dev)
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{
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if (dev) {
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free(dev);
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}
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return 0;
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}
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/******************************************************************************/
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/**
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* module methods
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*/
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/** Open a new instance of a lights device using name */
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static int open_lights(const struct hw_module_t* module, char const* name,
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struct hw_device_t** device)
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{
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int (*set_light)(struct light_device_t* dev,
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struct light_state_t const* state);
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if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
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set_light = set_light_backlight;
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else if (0 == strcmp(LIGHT_ID_BATTERY, name))
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set_light = set_light_battery;
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else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
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set_light = set_light_notifications;
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else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
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set_light = set_light_attention;
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else
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return -EINVAL;
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pthread_once(&g_init, init_globals);
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struct light_device_t *dev = malloc(sizeof(struct light_device_t));
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if(!dev)
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return -ENOMEM;
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memset(dev, 0, sizeof(*dev));
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dev->common.tag = HARDWARE_DEVICE_TAG;
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dev->common.version = 0;
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dev->common.module = (struct hw_module_t*)module;
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dev->common.close = (int (*)(struct hw_device_t*))close_lights;
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dev->set_light = set_light;
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*device = (struct hw_device_t*)dev;
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return 0;
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}
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static struct hw_module_methods_t lights_module_methods = {
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.open = open_lights,
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};
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/*
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* The lights Module
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*/
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struct hw_module_t HAL_MODULE_INFO_SYM = {
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.tag = HARDWARE_MODULE_TAG,
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.version_major = 1,
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.version_minor = 0,
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.id = LIGHTS_HARDWARE_MODULE_ID,
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.name = "Lights Module",
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.author = "The CyanogenMod Project",
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.methods = &lights_module_methods,
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};
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