mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
91 lines
2.9 KiB
Diff
91 lines
2.9 KiB
Diff
From 6a206d84d88d57fd874482ee25c8ee66da65c8e6 Mon Sep 17 00:00:00 2001
|
|
From: Fabrice Gasnier <fabrice.gasnier@st.com>
|
|
Date: Mon, 1 Oct 2018 15:23:57 +0200
|
|
Subject: [PATCH 311/432] pwm: Send a uevent on the pwmchip device upon channel
|
|
sysfs (un)export
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
commit 552c02e3e7cfe2744b59de285aaea70021ae95c9 upstream.
|
|
|
|
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 7e5d1fd75c3d ("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
|
|
|
|
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>
|
|
---
|
|
drivers/pwm/sysfs.c | 11 +++++++++++
|
|
1 file changed, 11 insertions(+)
|
|
|
|
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
|
|
index 4726d43aaa0c..ceb233dd6048 100644
|
|
--- a/drivers/pwm/sysfs.c
|
|
+++ b/drivers/pwm/sysfs.c
|
|
@@ -249,6 +249,7 @@ static void pwm_export_release(struct device *child)
|
|
static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
|
|
{
|
|
struct pwm_export *export;
|
|
+ char *pwm_prop[2];
|
|
int ret;
|
|
|
|
if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags))
|
|
@@ -276,6 +277,10 @@ static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
|
|
export = NULL;
|
|
return ret;
|
|
}
|
|
+ pwm_prop[0] = kasprintf(GFP_KERNEL, "EXPORT=pwm%u", pwm->hwpwm);
|
|
+ pwm_prop[1] = NULL;
|
|
+ kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);
|
|
+ kfree(pwm_prop[0]);
|
|
|
|
return 0;
|
|
}
|
|
@@ -288,6 +293,7 @@ static int pwm_unexport_match(struct device *child, void *data)
|
|
static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)
|
|
{
|
|
struct device *child;
|
|
+ char *pwm_prop[2];
|
|
|
|
if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags))
|
|
return -ENODEV;
|
|
@@ -296,6 +302,11 @@ static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)
|
|
if (!child)
|
|
return -ENODEV;
|
|
|
|
+ pwm_prop[0] = kasprintf(GFP_KERNEL, "UNEXPORT=pwm%u", pwm->hwpwm);
|
|
+ pwm_prop[1] = NULL;
|
|
+ kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);
|
|
+ kfree(pwm_prop[0]);
|
|
+
|
|
/* for device_find_child() */
|
|
put_device(child);
|
|
device_unregister(child);
|
|
--
|
|
2.19.1
|
|
|