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Add udev rules to use GPIO ports as non-root user (#18)

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Nils Werner 2019-02-15 03:06:53 +01:00 committed by Kevin Mihelich
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10
Raspberry_Pi.md
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@ -249,6 +249,16 @@ Finally, read the sensor output:
To enable the 1-wire interface add this line to `/boot/config.txt` and reboot. To enable the 1-wire interface add this line to `/boot/config.txt` and reboot.
`dtoverlay=w1-gpio` `dtoverlay=w1-gpio`
### Non-Root GPIO
To use the GPIO/SPI pins as a regular non-root user (in group `tty`), add the following lines to a new file `/usr/lib/udev/rules.d/99-spi-permissions.rules`
KERNEL=="spidev*", GROUP="tty", MODE="0660"
SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c 'chown -R root:tty /sys/class/gpio && chmod -R 775 /sys/class/gpio; chown -R root:tty /sys/devices/virtual/gpio && chmod -R 775 /sys/devices/virtual/gpio; chown -R root:tty /sys/devices/platform/soc/*.gpio/gpio && chmod -R 775 /sys/devices/platform/soc/*.gpio/gpio'"
SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:tty /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"
SUBSYSTEM=="gpio", KERNEL=="gpio*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:tty /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value'"
## See Also ## See Also
* [Raspberry Pi](https://www.raspberrypi.org/) - Official website * [Raspberry Pi](https://www.raspberrypi.org/) - Official website