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92 lines
2.3 KiB
92 lines
2.3 KiB
/* |
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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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static const AP_HAL::HAL &hal = AP_HAL::get_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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