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# Grants 'pwm' group RW access to Raspberry Pi PWM sysfs interfaces
#
# Handles both:
# - Standard /sys/class/pwm paths
# - RPi5-specific PCIe PWM controllers (/sys/devices/platform/axi/...)
#
# Note: For race-free operation, check file writability (not just existence)
# using `access(2)` before attempting operations.
SUBSYSTEM=="pwm*", PROGRAM="/bin/sh -c ' \
chown -R root:pwm /sys/class/pwm ; \
chmod -R 770 /sys/class/pwm ; \
chown -R root:pwm /sys/devices/platform/axi/1000120000.pcie/*.pwm/pwm/pwmchip* ; \
chmod -R 770 /sys/devices/platform/axi/1000120000.pcie/*.pwm/pwm/pwmchip* ; \
'"
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