From 02f13352857aa73ae8965e9dc7fa2bb0b7c8a2a2 Mon Sep 17 00:00:00 2001
From: Drew Fustini <drew@pdp7.com>
Date: Tue, 4 Apr 2017 04:26:41 +0000
Subject: [PATCH] add udev rules and script for non-root access to gpio

Refer to Issue #137 for details:
  Access to GPIO and PWM as non-root user not functioning
  https://github.com/adafruit/adafruit-beaglebone-io-python/issues/137
---
 udev/80-non-root-gpio-permissions.rules |  1 +
 udev/udev-non-root-gpio-permissions.sh  | 46 +++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 udev/80-non-root-gpio-permissions.rules
 create mode 100755 udev/udev-non-root-gpio-permissions.sh

diff --git a/udev/80-non-root-gpio-permissions.rules b/udev/80-non-root-gpio-permissions.rules
new file mode 100644
index 0000000..daf7e1d
--- /dev/null
+++ b/udev/80-non-root-gpio-permissions.rules
@@ -0,0 +1 @@
+KERNEL=="gpio*", SUBSYSTEM=="gpio", ACTION=="add", PROGRAM="/usr/local/bin/udev-non-root-gpio-permissions.sh"
diff --git a/udev/udev-non-root-gpio-permissions.sh b/udev/udev-non-root-gpio-permissions.sh
new file mode 100755
index 0000000..eb928df
--- /dev/null
+++ b/udev/udev-non-root-gpio-permissions.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# Result: chown debian:debian /sys/class/gpio
+
+chown -R debian:debian /sys/devices/gpio
+chown -R debian:debian /sys/class/gpio
+chown -R debian:debian /sys/devices/platform/ocp
+chown -R debian:debian /sys/class/pwm
+
+#GPIO ( active_low device direction edge power subsystem uevent value )
+find /sys/class/gpio -type d -exec chmod 2770 {} \;
+find /sys/class/gpio -name "direction" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "edge" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "value" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "active_low" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "device" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "power" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "subsystem" -exec chmod 0660 {} \;
+
+#PWM ( duty_cycle enable period polarity power uevent )
+find /sys/devices/platform/ocp -name "duty_cycle" -exec chmod 0660 {} \;
+find /sys/devices/platform/ocp -name "enable" -exec chmod 0660 {} \;
+find /sys/devices/platform/ocp -name "period" -exec chmod 0660 {} \;
+find /sys/devices/platform/ocp -name "polarity" -exec chmod 0660 {} \;
+find /sys/devices/platform/ocp -name "power" -exec chmod 0660 {} \;
+find /sys/class/pwm -name "duty_cycle" -exec chmod 0660 {} \;
+find /sys/class/pwm -name "enable" -exec chmod 0660 {} \;
+find /sys/class/pwm -name "period" -exec chmod 0660 {} \;
+find /sys/class/pwm -name "polarity" -exec chmod 0660 {} \;
+find /sys/class/pwm -name "power" -exec chmod 0660 {} \;
+
+chmod 0220 /sys/class/gpio/export
+chmod 0220 /sys/class/gpio/unexport
+chmod 0220 /sys/class/pwm/export
+chmod 0220 /sys/class/pwm/unexport
+
+find /sys/class/gpio -name "uevent" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "autosuspend_delay_ms" -exec chmod 0660 {} \;
+find /sys/class/gpio -name "control" -exec chmod 0660 {} \;
+find /sys/class/pwm -name "uevent" -exec chmod 0660 {} \;
+find /sys/devices/platform/ocp -name "uevent" -exec chmod 0660 {} \;
+
+# Additional code for getting AIN pins set up
+ain_activator=/sys/devices/platform/bone_capemgr/slots
+chown -R debian:debian $ain_activator/
+chmod -R 2770 $ain_activator/