diff options
Diffstat (limited to 'src/backlight')
| l--------- | src/backlight/Makefile | 1 | ||||
| -rw-r--r-- | src/backlight/backlight.c | 126 |
2 files changed, 127 insertions, 0 deletions
diff --git a/src/backlight/Makefile b/src/backlight/Makefile new file mode 120000 index 0000000000..d0b0e8e008 --- /dev/null +++ b/src/backlight/Makefile @@ -0,0 +1 @@ +../Makefile
\ No newline at end of file diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c new file mode 100644 index 0000000000..3378907f91 --- /dev/null +++ b/src/backlight/backlight.c @@ -0,0 +1,126 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2013 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <libudev.h> + +#include "util.h" +#include "mkdir.h" +#include "fileio.h" + +int main(int argc, char *argv[]) { + struct udev *udev = NULL; + struct udev_device *device = NULL; + _cleanup_free_ char *saved = NULL; + int r; + + if (argc != 3) { + log_error("This program requires two arguments."); + return EXIT_FAILURE; + } + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + + r = mkdir_p("/var/lib/backlight", 0755); + if (r < 0) { + log_error("Failed to create backlight directory: %s", strerror(-r)); + goto finish; + } + + udev = udev_new(); + if (!udev) { + r = log_oom(); + goto finish; + } + + device = udev_device_new_from_syspath(udev, argv[2]); + if (!device) { + r = log_oom(); + goto finish; + } + + if (!streq_ptr(udev_device_get_subsystem(device), "backlight")) { + log_error("Not a backlight device: %s", argv[2]); + r = -ENODEV; + goto finish; + } + + saved = strappend("/var/lib/backlight/", udev_device_get_sysname(device)); + if (!saved) { + r = log_oom(); + goto finish; + } + + if (streq(argv[1], "load")) { + _cleanup_free_ char *value = NULL; + + r = read_one_line_file(saved, &value); + if (r < 0) { + + if (r == -ENOENT) { + r = 0; + goto finish; + } + + log_error("Failed to read %s: %s", saved, strerror(-r)); + goto finish; + } + + r = udev_device_set_sysattr_value(device, "brightness", value); + if (r < 0) { + log_error("Failed to write system attribute: %s", strerror(-r)); + goto finish; + } + + } else if (streq(argv[1], "save")) { + const char *value; + + value = udev_device_get_sysattr_value(device, "brightness"); + if (!value) { + log_error("Failed to read system attribute: %s", strerror(-r)); + goto finish; + } + + r = write_string_file(saved, value); + if (r < 0) { + log_error("Failed to write %s: %s", saved, strerror(-r)); + goto finish; + } + + } else { + log_error("Unknown verb %s.", argv[1]); + r = -EINVAL; + goto finish; + } + +finish: + if (device) + udev_device_unref(device); + + if (udev) + udev_unref(udev); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; + +} |