diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index a813239..fc50f93 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -249,6 +249,7 @@
 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))
@@ -275,6 +276,10 @@
 		kfree(export);
 		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;
 }
@@ -287,6 +292,7 @@
 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;
@@ -295,6 +301,11 @@
 	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);