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