78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source 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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#include <hardware_legacy/led.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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const char* const CADENCE_FILE = "/sys/class/leds/left/cadence";
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const char* const COLOR_FILE = "/sys/class/leds/left/color";
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const char* const BT_WIFI_FILE = "/sys/class/leds/right/brightness";
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static int
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write_string(const char* file, const char* string, int len)
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{
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int fd;
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ssize_t amt;
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fd = open(file, O_RDWR);
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if (fd < 0) {
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return errno;
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}
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amt = write(fd, string, len+1);
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close(fd);
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return amt >= 0 ? 0 : errno;
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}
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int sardine_set_led_state(unsigned colorARGB, int onMS, int offMS)
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{
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int len;
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char buf[30];
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int red, green, color;
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// alpha of 0 or color of 0 (ignoring blue) means off
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if ((colorARGB & 0xff000000) == 0 || (colorARGB & 0x00ffff00) == 0) {
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onMS = 0;
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offMS = 0;
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}
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// blue means green
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if ((colorARGB & 0x00ffff00) == 0 && (colorARGB & 0x000000ff) != 0) {
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colorARGB |= (colorARGB & 0x000000ff) << 8;
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}
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// ===== color =====
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// this color conversion isn't really correct, but it's better to
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// have the light come bright on when asked for low intensity than to
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// not come on at all. we have no blue
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red = (colorARGB & 0x00ff0000) ? 1 : 0;
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green = (colorARGB & 0x0000ff00) ? 2 : 0;
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color = (red | green) - 1;
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len = sprintf(buf, "%d", color);
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write_string(COLOR_FILE, buf, len);
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// ===== color =====
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len = sprintf(buf, "%d,%d", onMS, offMS);
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write_string(CADENCE_FILE, buf, len);
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return 0;
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}
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