I found gpio-shutdown parameter for enable Device Tree Overlays on new firmware.
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:
ACTION!="REMOVE", SUBSYSTEM=="input", KERNEL=="event*", \
SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", \
ATTRS{keys}=="116", TAG+="power-switch"
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
button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
you get a shutdown and power-up button.
Load: dtoverlay=gpio-shutdown,<param>=<val>
Params: gpio_pin GPIO pin to trigger on (default 3)
active_low When this is 1 (active low), a falling
edge generates a key down event and a
rising edge generates a key up event.
When this is 0 (active high), this is
reversed. The default is 1 (active low).
gpio_pull Desired pull-up/down state (off, down, up)
Default is "up".
Note that the default pin (GPIO3) has an
external pullup.
Reference: https://github.com/raspberrypi/firmware/tree/master/boot/overlaysStep to create shutdown switch
- Connect switch to GPIO3.
- Add config device tree overlays on /boot/config.txt.
dtoverlay=gpio-shutdown,gpio_pin=3,active_low=1,gpio_pull=up
- Create file /etc/udev/rules.d/99-gpio-power.rules
ACTION!="REMOVE", SUBSYSTEM=="input", KERNEL=="event*", \
SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", \
ATTRS{keys}=="116", TAG+="power-switch"
- And restart raspberry pi.
After reboot success. I try to push switch.
It works ;). My raspberry pi is shutdown.
Hope to help you.
*** I2C must be deactivated if you use pin 3. (Thank you @Irmoreno007)
