| From 047041db91fabcb768c3e5680645b69fa9528e86 Mon Sep 17 00:00:00 2001 |
| From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org> |
| Date: Thu, 30 Apr 2020 19:40:07 +0200 |
| Subject: [PATCH] overlays: gpio-shutdown: Add information for SysV |
| init / inittab |
| |
| KeyboardSignal and kb::kbrequest can be used to call /sbin/shutdown |
| --- |
| arch/arm/boot/dts/overlays/README | 24 ++++++++++++++++++++++++ |
| 1 file changed, 24 insertions(+) |
| |
| --- a/arch/arm/boot/dts/overlays/README |
| +++ b/arch/arm/boot/dts/overlays/README |
| @@ -847,6 +847,7 @@ Params: gpiopin GPIO for |
| Name: gpio-shutdown |
| Info: Initiates a shutdown when GPIO pin changes. The given GPIO pin |
| is configured as an input key that generates KEY_POWER events. |
| + |
| This event is handled by systemd-logind by initiating a |
| shutdown. Systemd versions older than 225 need an udev rule |
| enable listening to the input device: |
| @@ -855,6 +856,29 @@ Info: Initiates a shutdown when GPIO p |
| SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", \ |
| ATTRS{keys}=="116", TAG+="power-switch" |
| |
| + Alternatively this event can be handled also on systems without |
| + systemd, just by traditional SysV init daemon. KEY_POWER event |
| + (keycode 116) needs to be mapped to KeyboardSignal on console |
| + and then kb::kbrequest inittab action which is triggered by |
| + KeyboardSignal from console can be configured to issue system |
| + shutdown. Steps for this configuration are: |
| + |
| + Add following lines to the /etc/console-setup/remap.inc file: |
| + |
| + # Key Power as special keypress |
| + keycode 116 = KeyboardSignal |
| + |
| + Then add following lines to /etc/inittab file: |
| + |
| + # Action on special keypress (Key Power) |
| + kb::kbrequest:/sbin/shutdown -t1 -a -h -P now |
| + |
| + And finally reload configuration by calling following commands: |
| + |
| + # dpkg-reconfigure console-setup |
| + # service console-setup reload |
| + # init q |
| + |
| This overlay only handles shutdown. After shutdown, the system |
| can be powered up again by driving GPIO3 low. The default |
| configuration uses GPIO3 with a pullup, so if you connect a |