target/linux/bcm27xx/patches-5.4/950-0754-overlays-gpio-shutdown-Add-information-for-SysV-init.patch

   1 From 047041db91fabcb768c3e5680645b69fa9528e86 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
   3 Date: Thu, 30 Apr 2020 19:40:07 +0200
   4 Subject: [PATCH] overlays: gpio-shutdown: Add information for SysV
   5  init / inittab
   6
   7 KeyboardSignal and kb::kbrequest can be used to call /sbin/shutdown
   8 ---
   9  arch/arm/boot/dts/overlays/README | 24 ++++++++++++++++++++++++
  10  1 file changed, 24 insertions(+)
  11
  12 --- a/arch/arm/boot/dts/overlays/README
  13 +++ b/arch/arm/boot/dts/overlays/README
  14 @@ -847,6 +847,7 @@ Params: gpiopin                 GPIO for
  15  Name:   gpio-shutdown
  16  Info:   Initiates a shutdown when GPIO pin changes. The given GPIO pin
  17          is configured as an input key that generates KEY_POWER events.
  18 +
  19          This event is handled by systemd-logind by initiating a
  20          shutdown. Systemd versions older than 225 need an udev rule
  21          enable listening to the input device:
  22 @@ -855,6 +856,29 @@ Info:   Initiates a shutdown when GPIO p
  23                          SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", \
  24                          ATTRS{keys}=="116", TAG+="power-switch"
  25
  26 +        Alternatively this event can be handled also on systems without
  27 +        systemd, just by traditional SysV init daemon. KEY_POWER event
  28 +        (keycode 116) needs to be mapped to KeyboardSignal on console
  29 +        and then kb::kbrequest inittab action which is triggered by
  30 +        KeyboardSignal from console can be configured to issue system
  31 +        shutdown. Steps for this configuration are:
  32 +
  33 +            Add following lines to the /etc/console-setup/remap.inc file:
  34 +
  35 +                # Key Power as special keypress
  36 +                keycode 116 = KeyboardSignal
  37 +
  38 +            Then add following lines to /etc/inittab file:
  39 +
  40 +                # Action on special keypress (Key Power)
  41 +                kb::kbrequest:/sbin/shutdown -t1 -a -h -P now
  42 +
  43 +            And finally reload configuration by calling following commands:
  44 +
  45 +                # dpkg-reconfigure console-setup
  46 +                # service console-setup reload
  47 +                # init q
  48 +
  49          This overlay only handles shutdown. After shutdown, the system
  50          can be powered up again by driving GPIO3 low. The default
  51          configuration uses GPIO3 with a pullup, so if you connect a