tree 031eeef42d9aadd3b5be16d1d4b6c76a58d3a4d9
parent 80d05c5d75f9454211d889f8d74ab3cca439740a
author Fabrice Gasnier <fabrice.gasnier@st.com> 1573171763 -0800
committer June Tate-Gans <jtgans@google.com> 1573245198 +0000

pwm: Send a uevent on the pwmchip device upon channel sysfs (un)export

This patch sends a uevent (KOBJ_CHANGE) on the pwmchipN device,
everytime a pwmX channel has been exported/unexported via sysfs. This
allows udev to implement rules on such events, like:

SUBSYSTEM=="pwm*", PROGRAM="/bin/sh -c '\
        chown -R root:gpio /sys/class/pwm && chmod -R 770 /sys/class/pwm;\
        chown -R root:gpio
/sys/devices/platform/soc/*.pwm/pwm/pwmchip* && chmod -R 770
/sys/devices/platform/soc/*.pwm/pwm/pwmchip*\
'"

This is a replacement patch for commit 7e5d1fd ("pwm: Set class for
exported channels in sysfs"), see [1].

basic testing:
$ udevadm monitor --environment &
$ echo 0 > /sys/class/pwm/pwmchip0/export
KERNEL[197.321736] change   /devices/.../pwm/pwmchip0 (pwm)
ACTION=change
DEVPATH=/devices/.../pwm/pwmchip0
EXPORT=pwm0
SEQNUM=2045
SUBSYSTEM=pwm

[1] https://lkml.org/lkml/2018/9/25/713

Cherry picked from:
https://github.com/raspberrypi/linux/commit/552c02e3e7cfe2744b59de285aaea70021ae95c9
BUG: 144068132

Change-Id: I590fa7e8f2f66a4767e7bcb109608012f451aef5
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Tested-by: Gottfried Haider <gottfried.haider@gmail.com>
Tested-by: Michal Vokáč <michal.vokac@ysoft.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit 1595d0453afebd96b49457791502058895a02211)