diff options
Diffstat (limited to 'led/led_sardine.c')
-rw-r--r-- | led/led_sardine.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/led/led_sardine.c b/led/led_sardine.c new file mode 100644 index 0000000..b6a508a --- /dev/null +++ b/led/led_sardine.c @@ -0,0 +1,78 @@ +/* + * 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. + */ +#include <hardware_legacy/led.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <stdio.h> + +const char* const CADENCE_FILE = "/sys/class/leds/left/cadence"; +const char* const COLOR_FILE = "/sys/class/leds/left/color"; +const char* const BT_WIFI_FILE = "/sys/class/leds/right/brightness"; + +static int +write_string(const char* file, const char* string, int len) +{ + int fd; + ssize_t amt; + + fd = open(file, O_RDWR); + if (fd < 0) { + return errno; + } + + amt = write(fd, string, len+1); + + close(fd); + return amt >= 0 ? 0 : errno; +} + +int sardine_set_led_state(unsigned colorARGB, int onMS, int offMS) +{ + int len; + char buf[30]; + int red, green, color; + + // alpha of 0 or color of 0 (ignoring blue) means off + if ((colorARGB & 0xff000000) == 0 || (colorARGB & 0x00ffff00) == 0) { + onMS = 0; + offMS = 0; + } + + // blue means green + if ((colorARGB & 0x00ffff00) == 0 && (colorARGB & 0x000000ff) != 0) { + colorARGB |= (colorARGB & 0x000000ff) << 8; + } + + // ===== color ===== + // this color conversion isn't really correct, but it's better to + // have the light come bright on when asked for low intensity than to + // not come on at all. we have no blue + red = (colorARGB & 0x00ff0000) ? 1 : 0; + green = (colorARGB & 0x0000ff00) ? 2 : 0; + color = (red | green) - 1; + + len = sprintf(buf, "%d", color); + write_string(COLOR_FILE, buf, len); + + // ===== color ===== + len = sprintf(buf, "%d,%d", onMS, offMS); + write_string(CADENCE_FILE, buf, len); + + return 0; +} |