mirror of https://github.com/ArduPilot/ardupilot
93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
/*
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Copyright (C) 2017 Mathieu Othacehe. All rights reserved.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Led_Sysfs.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <AP_HAL/AP_HAL.h>
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extern const AP_HAL::HAL& hal;
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namespace Linux {
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Led_Sysfs::Led_Sysfs(const char *led_name)
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: _led_name(led_name)
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{
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}
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Led_Sysfs::~Led_Sysfs()
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{
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if (_brightness_fd >= 0) {
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close(_brightness_fd);
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}
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}
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bool Led_Sysfs::init()
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{
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char *br_path;
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char *max_br_path;
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if (asprintf(&br_path, "/sys/class/leds/%s/brightness", _led_name) == -1) {
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AP_HAL::panic("LinuxLed_Sysfs : Couldn't allocate brightness path");
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}
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_brightness_fd = open(br_path, O_WRONLY | O_CLOEXEC);
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if (_brightness_fd < 0) {
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printf("LinuxLed_Sysfs: Unable to open file %s\n", br_path);
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free(br_path);
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return false;
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}
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if (asprintf(&max_br_path, "/sys/class/leds/%s/max_brightness", _led_name) == -1) {
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AP_HAL::panic("LinuxLed_Sysfs : Couldn't allocate max_brightness path");
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}
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if (Util::from(hal.util)->read_file(max_br_path, "%u", &_max_brightness) < 0) {
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AP_HAL::panic("LinuxLed_Sysfs : Unable to read max_brightness in %s",
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max_br_path);
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}
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free(max_br_path);
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free(br_path);
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return true;
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}
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bool Led_Sysfs::set_brightness(uint8_t brightness)
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{
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if (_brightness_fd < 0) {
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return false;
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}
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unsigned int br = brightness * _max_brightness / UINT8_MAX;
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/* Don't log fails since this could spam the console */
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if (dprintf(_brightness_fd, "%u", br) < 0) {
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return false;
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}
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return true;
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}
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}
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