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Add support for saving/restoring keyboard backlights

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Piggy-backing on the display backlight code, this saves and restores
keyboard backlights on supported devices.

The detection code matches that of UPower:
http://cgit.freedesktop.org/upower/tree/src/up-kbd-backlight.c#n173

https://bugs.freedesktop.org/show_bug.cgi?id=70367

[tomegun: also work for devices named "{smc,samsung,asus}::kbd_backlight"]
This commit is contained in:
Bastien Nocera 2013-10-11 09:45:32 +02:00 committed by Tom Gundersen
parent f6f2ad9b9c
commit 1a0464230c
2 changed files with 8 additions and 3 deletions
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4
rules/99-systemd.rules.in
View file

@ -51,9 +51,11 @@ SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ENV{ID_USB_INTERFACES}=="*:0701??:
ACTION=="add", SUBSYSTEM=="net", KERNEL!="lo", RUN+="@rootlibexecdir@/systemd-sysctl --prefix=/proc/sys/net/ipv4/conf/$name --prefix=/proc/sys/net/ipv4/neigh/$name --prefix=/proc/sys/net/ipv6/conf/$name --prefix=/proc/sys/net/ipv6/neigh/$name"
# Pull in backlight save/restore for all firmware backlight devices
# Pull in backlight save/restore for all firmware backlight devices,
# and keyboard backlights
ACTION=="add", SUBSYSTEM=="backlight", ATTR{type}=="firmware", TAG+="systemd", ENV{SYSTEMD_WANTS}+="systemd-backlight@$name.service"
ACTION=="add", SUBSYSTEM=="leds", KERNEL=="*kbd_backlight", TAG+="systemd", ENV{SYSTEMD_WANTS}+="systemd-backlight@$name.service"
# Asynchronously mount file systems implemented by these modules as
# soon as they are loaded.

7
src/backlight/backlight.c
View file

@ -56,9 +56,11 @@ int main(int argc, char *argv[]) {
errno = 0;
device = udev_device_new_from_subsystem_sysname(udev, "backlight", argv[2]);
if (!device)
device = udev_device_new_from_subsystem_sysname(udev, "leds", argv[2]);
if (!device) {
if (errno != 0) {
log_error("Failed to get backlight device: %m");
log_error("Failed to get backlight device '%s': %m", argv[2]);
r = -errno;
} else
r = log_oom();
@ -66,7 +68,8 @@ int main(int argc, char *argv[]) {
goto finish;
}
if (!streq_ptr(udev_device_get_subsystem(device), "backlight")) {
if (!streq_ptr(udev_device_get_subsystem(device), "backlight") &&
!streq_ptr(udev_device_get_subsystem(device), "leds")) {
log_error("Not a backlight device: %s", argv[2]);
r = -ENODEV;
goto finish;