# /etc/udev/rules.d/81-pwm-noroot.rules
#
# ReWritten by: Matthijs van Duin
# Corrects sys PWM permissions on the BB so non-root users in the pwm group can
# manipulate pwm along with creating a symlink under /dev/pwm/
#
SUBSYSTEM=="pwm", ACTION=="add|change", \
        RUN+="/bin/chgrp -R gpio '/sys%p'", \
        RUN+="/bin/chmod -R g=u '/sys%p'"

# automatically export pwm channels
# SUBSYSTEM=="pwm", KERNEL=="pwmchip*", ACTION=="add", ATTR{export}="0"
# SUBSYSTEM=="pwm", KERNEL=="pwmchip*", ACTION=="add", ATTR{npwm}!="1",  ATTR{export}="1"

# identify pwm peripherals on am335x
SUBSYSTEM=="pwm", KERNELS=="48300100.*",  ENV{PWMCHIP_NAME}="ecap0"
SUBSYSTEM=="pwm", KERNELS=="48300200.*",  ENV{PWMCHIP_NAME}="ehrpwm0"
SUBSYSTEM=="pwm", KERNELS=="48302100.*",  ENV{PWMCHIP_NAME}="ecap1"
SUBSYSTEM=="pwm", KERNELS=="48302200.*",  ENV{PWMCHIP_NAME}="ehrpwm1"
SUBSYSTEM=="pwm", KERNELS=="48304100.*",  ENV{PWMCHIP_NAME}="ecap2"
SUBSYSTEM=="pwm", KERNELS=="48304200.*",  ENV{PWMCHIP_NAME}="ehrpwm2"

# identify pwm peripherals on am57xx/dra7xx
SUBSYSTEM=="pwm", KERNELS=="4843e100.*",  ENV{PWMCHIP_NAME}="ecap0"
SUBSYSTEM=="pwm", KERNELS=="4843e200.*",  ENV{PWMCHIP_NAME}="ehrpwm0"
SUBSYSTEM=="pwm", KERNELS=="48440100.*",  ENV{PWMCHIP_NAME}="ecap1"
SUBSYSTEM=="pwm", KERNELS=="48440200.*",  ENV{PWMCHIP_NAME}="ehrpwm1"
SUBSYSTEM=="pwm", KERNELS=="48442100.*",  ENV{PWMCHIP_NAME}="ecap2"
SUBSYSTEM=="pwm", KERNELS=="48442200.*",  ENV{PWMCHIP_NAME}="ehrpwm2"

# identify pwm channels
SUBSYSTEM=="pwm", ENV{DEVTYPE}=="pwm_channel", ENV{PWMCHIP_NAME}!="", ATTR{../npwm}=="1",  ENV{PWM_NAME}="%E{PWMCHIP_NAME}"
SUBSYSTEM=="pwm", ENV{DEVTYPE}=="pwm_channel", ENV{PWMCHIP_NAME}!="", DRIVERS=="ehrpwm", KERNEL=="*:0",  ENV{PWM_NAME}="%E{PWMCHIP_NAME}a"
SUBSYSTEM=="pwm", ENV{DEVTYPE}=="pwm_channel", ENV{PWMCHIP_NAME}!="", DRIVERS=="ehrpwm", KERNEL=="*:1",  ENV{PWM_NAME}="%E{PWMCHIP_NAME}b"

# create symlinks in /dev/pwm
SUBSYSTEM=="pwm", ENV{DEVTYPE}=="pwm_channel", ACTION=="add", ENV{PWM_NAME}!="", \
        RUN+="/bin/mkdir -p /dev/pwm", \
        RUN+="/bin/ln -sT '/sys/class/pwm/%k' /dev/pwm/%E{PWM_NAME}"


# NICO. mia regola per il controllo ventilatore via service di systemd
SUBSYSTEM=="pwm", ENV{DEVTYPE}=="pwm_channel", ACTION=="add", ENV{PWM_NAME}="ehrpwm1a", \
        RUN+="/bin/ln -sT '/dev/pwm/ehrpwm1a' /dev/fan-cape-pwm", \
        RUN+="/bin/chgrp -R gpio /dev/fan-cape-pwm", \
        TAG+="systemd", ENV{SYSTEMD_ALIAS}+="/dev/fan-cape-pwm"