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en:gpiomem [2017/02/03 10:47] brian.kim created |
en:gpiomem [2017/02/03 14:51] (current) brian.kim [Rootless GPIO access: /dev/gpiomem] |
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| ===== Rootless GPIO access: /dev/gpiomem ===== | ===== Rootless GPIO access: /dev/gpiomem ===== | ||
| ///dev/gpiomem// provides user with root-free access to the GPIO registers. Opening ///dev/gpiomem// device file and calling //mmap()// function will map the GPIO registers' memory map area to the user's pointer.\\ | ///dev/gpiomem// provides user with root-free access to the GPIO registers. Opening ///dev/gpiomem// device file and calling //mmap()// function will map the GPIO registers' memory map area to the user's pointer.\\ | ||
| - | This driver is added in below's Ubuntu kernel versions: | + | This driver is available in below's Ubuntu kernel versions: |
| * ODROID-C2: 3.14.79-105 kernel version or later | * ODROID-C2: 3.14.79-105 kernel version or later | ||
| * ODROID-C0/C1+: 3.10.104-182 kernel version or later | * ODROID-C0/C1+: 3.10.104-182 kernel version or later | ||
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| } | } | ||
| </code> | </code> | ||
| + | |||
| + | ===== Rootless GPIO SYS-filesystem: /sys/class/gpio ===== | ||
| + | <code> | ||
| + | $ sudo addgroup gpio | ||
| + | $ sudo usermod -a -G gpio odroid | ||
| + | $ cat /etc/udev/rules.d/90-odroid-sysfs.rules | ||
| + | </code> | ||
| + | |||
| + | <code> | ||
| + | SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /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:gpio /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'" | ||
| + | </code> | ||
| + | |||
| + | |||
