Remove src/backlight

2 files changed, 0 insertions, 431 deletions

diff --git a/src/backlight/Makefile b/src/backlight/Makefile
deleted file mode 120000
index d0b0e8e008..0000000000
--- a/src/backlight/Makefile
+++ /dev/null
@@ -1 +0,0 @@
-../Makefile
\ No newline at end of file
diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c
deleted file mode 100644
index c79ad6520c..0000000000
--- a/src/backlight/backlight.c
+++ /dev/null
@@ -1,430 +0,0 @@
-/*-*- 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 "util.h"
-#include "mkdir.h"
-#include "fileio.h"
-#include "libudev.h"
-#include "udev-util.h"
-#include "def.h"
-
-static struct udev_device *find_pci_or_platform_parent(struct udev_device *device) {
-        struct udev_device *parent;
-        const char *subsystem, *sysname;
-
-        assert(device);
-
-        parent = udev_device_get_parent(device);
-        if (!parent)
-                return NULL;
-
-        subsystem = udev_device_get_subsystem(parent);
-        if (!subsystem)
-                return NULL;
-
-        sysname = udev_device_get_sysname(parent);
-        if (!sysname)
-                return NULL;
-
-        if (streq(subsystem, "drm")) {
-                const char *c;
-
-                c = startswith(sysname, "card");
-                if (!c)
-                        return NULL;
-
-                c += strspn(c, DIGITS);
-                if (*c == '-') {
-                        /* A connector DRM device, let's ignore all but LVDS and eDP! */
-
-                        if (!startswith(c, "-LVDS-") &&
-                            !startswith(c, "-Embedded DisplayPort-"))
-                                return NULL;
-                }
-
-        } else if (streq(subsystem, "pci")) {
-                const char *value;
-
-                value = udev_device_get_sysattr_value(parent, "class");
-                if (value) {
-                        unsigned long class = 0;
-
-                        if (safe_atolu(value, &class) < 0) {
-                                log_warning("Cannot parse PCI class %s of device %s:%s.",
-                                            value, subsystem, sysname);
-                                return NULL;
-                        }
-
-                        /* Graphics card */
-                        if (class == 0x30000)
-                                return parent;
-                }
-
-        } else if (streq(subsystem, "platform"))
-                return parent;
-
-        return find_pci_or_platform_parent(parent);
-}
-
-static bool same_device(struct udev_device *a, struct udev_device *b) {
-        assert(a);
-        assert(b);
-
-        if (!streq_ptr(udev_device_get_subsystem(a), udev_device_get_subsystem(b)))
-                return false;
-
-        if (!streq_ptr(udev_device_get_sysname(a), udev_device_get_sysname(b)))
-                return false;
-
-        return true;
-}
-
-static bool validate_device(struct udev *udev, struct udev_device *device) {
-        _cleanup_udev_enumerate_unref_ struct udev_enumerate *enumerate = NULL;
-        struct udev_list_entry *item = NULL, *first = NULL;
-        struct udev_device *parent;
-        const char *v, *subsystem;
-        int r;
-
-        assert(udev);
-        assert(device);
-
-        /* Verify whether we should actually care for a specific
-         * backlight device. For backlight devices there might be
-         * multiple ways to access the same control: "firmware"
-         * (i.e. ACPI), "platform" (i.e. via the machine's EC) and
-         * "raw" (via the graphics card). In general we should prefer
-         * "firmware" (i.e. ACPI) or "platform" access over "raw"
-         * access, in order not to confuse the BIOS/EC, and
-         * compatibility with possible low-level hotkey handling of
-         * screen brightness. The kernel will already make sure to
-         * expose only one of "firmware" and "platform" for the same
-         * device to userspace. However, we still need to make sure
-         * that we use "raw" only if no "firmware" or "platform"
-         * device for the same device exists. */
-
-        subsystem = udev_device_get_subsystem(device);
-        if (!streq_ptr(subsystem, "backlight"))
-                return true;
-
-        v = udev_device_get_sysattr_value(device, "type");
-        if (!streq_ptr(v, "raw"))
-                return true;
-
-        parent = find_pci_or_platform_parent(device);
-        if (!parent)
-                return true;
-
-        subsystem = udev_device_get_subsystem(parent);
-        if (!subsystem)
-                return true;
-
-        enumerate = udev_enumerate_new(udev);
-        if (!enumerate)
-                return true;
-
-        r = udev_enumerate_add_match_subsystem(enumerate, "backlight");
-        if (r < 0)
-                return true;
-
-        r = udev_enumerate_scan_devices(enumerate);
-        if (r < 0)
-                return true;
-
-        first = udev_enumerate_get_list_entry(enumerate);
-        udev_list_entry_foreach(item, first) {
-                _cleanup_udev_device_unref_ struct udev_device *other;
-                struct udev_device *other_parent;
-                const char *other_subsystem;
-
-                other = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
-                if (!other)
-                        return true;
-
-                if (same_device(device, other))
-                        continue;
-
-                v = udev_device_get_sysattr_value(other, "type");
-                if (!streq_ptr(v, "platform") && !streq_ptr(v, "firmware"))
-                        continue;
-
-                /* OK, so there's another backlight device, and it's a
-                 * platform or firmware device, so, let's see if we
-                 * can verify it belongs to the same device as
-                 * ours. */
-                other_parent = find_pci_or_platform_parent(other);
-                if (!other_parent)
-                        continue;
-
-                if (same_device(parent, other_parent)) {
-                        /* Both have the same PCI parent, that means
-                         * we are out. */
-                        log_debug("Skipping backlight device %s, since device %s is on same PCI device and takes precedence.",
-                                  udev_device_get_sysname(device),
-                                  udev_device_get_sysname(other));
-                        return false;
-                }
-
-                other_subsystem = udev_device_get_subsystem(other_parent);
-                if (streq_ptr(other_subsystem, "platform") && streq_ptr(subsystem, "pci")) {
-                        /* The other is connected to the platform bus
-                         * and we are a PCI device, that also means we
-                         * are out. */
-                        log_debug("Skipping backlight device %s, since device %s is a platform device and takes precedence.",
-                                  udev_device_get_sysname(device),
-                                  udev_device_get_sysname(other));
-                        return false;
-                }
-        }
-
-        return true;
-}
-
-static unsigned get_max_brightness(struct udev_device *device) {
-        int r;
-        const char *max_brightness_str;
-        unsigned max_brightness;
-
-        max_brightness_str = udev_device_get_sysattr_value(device, "max_brightness");
-        if (!max_brightness_str) {
-                log_warning("Failed to read 'max_brightness' attribute.");
-                return 0;
-        }
-
-        r = safe_atou(max_brightness_str, &max_brightness);
-        if (r < 0) {
-                log_warning_errno(r, "Failed to parse 'max_brightness' \"%s\": %m", max_brightness_str);
-                return 0;
-        }
-
-        if (max_brightness <= 0) {
-                log_warning("Maximum brightness is 0, ignoring device.");
-                return 0;
-        }
-
-        return max_brightness;
-}
-
-/* Some systems turn the backlight all the way off at the lowest levels.
- * clamp_brightness clamps the saved brightness to at least 1 or 5% of
- * max_brightness in case of 'backlight' subsystem. This avoids preserving
- * an unreadably dim screen, which would otherwise force the user to
- * disable state restoration. */
-static void clamp_brightness(struct udev_device *device, char **value, unsigned max_brightness) {
-        int r;
-        unsigned brightness, new_brightness, min_brightness;
-        const char *subsystem;
-
-        r = safe_atou(*value, &brightness);
-        if (r < 0) {
-                log_warning_errno(r, "Failed to parse brightness \"%s\": %m", *value);
-                return;
-        }
-
-        subsystem = udev_device_get_subsystem(device);
-        if (streq_ptr(subsystem, "backlight"))
-                min_brightness = MAX(1U, max_brightness/20);
-        else
-                min_brightness = 0;
-
-        new_brightness = CLAMP(brightness, min_brightness, max_brightness);
-        if (new_brightness != brightness) {
-                char *old_value = *value;
-
-                r = asprintf(value, "%u", new_brightness);
-                if (r < 0) {
-                        log_oom();
-                        return;
-                }
-
-                log_info("Saved brightness %s %s to %s.", old_value,
-                         new_brightness > brightness ?
-                         "too low; increasing" : "too high; decreasing",
-                         *value);
-
-                free(old_value);
-        }
-}
-
-int main(int argc, char *argv[]) {
-        _cleanup_udev_unref_ struct udev *udev = NULL;
-        _cleanup_udev_device_unref_ struct udev_device *device = NULL;
-        _cleanup_free_ char *saved = NULL, *ss = NULL, *escaped_ss = NULL, *escaped_sysname = NULL, *escaped_path_id = NULL;
-        const char *sysname, *path_id;
-        unsigned max_brightness;
-        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/systemd/backlight", 0755);
-        if (r < 0) {
-                log_error_errno(r, "Failed to create backlight directory /var/lib/systemd/backlight: %m");
-                return EXIT_FAILURE;
-        }
-
-        udev = udev_new();
-        if (!udev) {
-                log_oom();
-                return EXIT_FAILURE;
-        }
-
-        sysname = strchr(argv[2], ':');
-        if (!sysname) {
-                log_error("Requires a subsystem and sysname pair specifying a backlight device.");
-                return EXIT_FAILURE;
-        }
-
-        ss = strndup(argv[2], sysname - argv[2]);
-        if (!ss) {
-                log_oom();
-                return EXIT_FAILURE;
-        }
-
-        sysname++;
-
-        if (!streq(ss, "backlight") && !streq(ss, "leds")) {
-                log_error("Not a backlight or LED device: '%s:%s'", ss, sysname);
-                return EXIT_FAILURE;
-        }
-
-        errno = 0;
-        device = udev_device_new_from_subsystem_sysname(udev, ss, sysname);
-        if (!device) {
-                if (errno != 0)
-                        log_error_errno(errno, "Failed to get backlight or LED device '%s:%s': %m", ss, sysname);
-                else
-                        log_oom();
-
-                return EXIT_FAILURE;
-        }
-
-        /* If max_brightness is 0, then there is no actual backlight
-         * device. This happens on desktops with Asus mainboards
-         * that load the eeepc-wmi module.
-         */
-        max_brightness = get_max_brightness(device);
-        if (max_brightness == 0)
-                return EXIT_SUCCESS;
-
-        escaped_ss = cescape(ss);
-        if (!escaped_ss) {
-                log_oom();
-                return EXIT_FAILURE;
-        }
-
-        escaped_sysname = cescape(sysname);
-        if (!escaped_sysname) {
-                log_oom();
-                return EXIT_FAILURE;
-        }
-
-        path_id = udev_device_get_property_value(device, "ID_PATH");
-        if (path_id) {
-                escaped_path_id = cescape(path_id);
-                if (!escaped_path_id) {
-                        log_oom();
-                        return EXIT_FAILURE;
-                }
-
-                saved = strjoin("/var/lib/systemd/backlight/", escaped_path_id, ":", escaped_ss, ":", escaped_sysname, NULL);
-        } else
-                saved = strjoin("/var/lib/systemd/backlight/", escaped_ss, ":", escaped_sysname, NULL);
-
-        if (!saved) {
-                log_oom();
-                return EXIT_FAILURE;
-        }
-
-        /* If there are multiple conflicting backlight devices, then
-         * their probing at boot-time might happen in any order. This
-         * means the validity checking of the device then is not
-         * reliable, since it might not see other devices conflicting
-         * with a specific backlight. To deal with this, we will
-         * actively delete backlight state files at shutdown (where
-         * device probing should be complete), so that the validity
-         * check at boot time doesn't have to be reliable. */
-
-        if (streq(argv[1], "load")) {
-                _cleanup_free_ char *value = NULL;
-                const char *clamp;
-
-                if (!shall_restore_state())
-                        return EXIT_SUCCESS;
-
-                if (!validate_device(udev, device))
-                        return EXIT_SUCCESS;
-
-                r = read_one_line_file(saved, &value);
-                if (r < 0) {
-
-                        if (r == -ENOENT)
-                                return EXIT_SUCCESS;
-
-                        log_error_errno(r, "Failed to read %s: %m", saved);
-                        return EXIT_FAILURE;
-                }
-
-                clamp = udev_device_get_property_value(device, "ID_BACKLIGHT_CLAMP");
-                if (!clamp || parse_boolean(clamp) != 0) /* default to clamping */
-                        clamp_brightness(device, &value, max_brightness);
-
-                r = udev_device_set_sysattr_value(device, "brightness", value);
-                if (r < 0) {
-                        log_error_errno(r, "Failed to write system 'brightness' attribute: %m");
-                        return EXIT_FAILURE;
-                }
-
-        } else if (streq(argv[1], "save")) {
-                const char *value;
-
-                if (!validate_device(udev, device)) {
-                        unlink(saved);
-                        return EXIT_SUCCESS;
-                }
-
-                value = udev_device_get_sysattr_value(device, "brightness");
-                if (!value) {
-                        log_error("Failed to read system 'brightness' attribute");
-                        return EXIT_FAILURE;
-                }
-
-                r = write_string_file(saved, value);
-                if (r < 0) {
-                        log_error_errno(r, "Failed to write %s: %m", saved);
-                        return EXIT_FAILURE;
-                }
-
-        } else {
-                log_error("Unknown verb %s.", argv[1]);
-                return EXIT_FAILURE;
-        }
-
-        return EXIT_SUCCESS;
-}