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authorHans de Goede <hdegoede@redhat.com>2021-08-16 14:30:07 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-08-16 19:32:02 +0300
commitb25d5a1cd19896bb87b399d6e24896cf6f854d44 (patch)
treeb334601a18f581fea190dad06855bb7c4aecb6ad /drivers/acpi
parent7c60610d476766e128cc4284bb6349732cbd6606 (diff)
downloadlinux-b25d5a1cd19896bb87b399d6e24896cf6f854d44.tar.xz
ACPI: platform-profile: call sysfs_notify() from platform_profile_store()
Drivers like thinkpad_acpi and ideapad_laptop call the platform_profile_notify() helper when the profile is changed by hardware (the embedded-controller/EC) in response to an EC handled hotkey. This allows userspace to monitor for such changes by polling for POLLPRI on the platform_profile sysfs file. But the profile can also be changed underneath a userspace program monitoring it by anonther userspace program storing a new value. Add a sysfs_notify() call to platform_profile_store(), so that userspace programs monitoring for changes also get notified in this case. Also update the documentation to document that POLLPRI polling can be used to watch for changes. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/platform_profile.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index dd2fbf38e414..d418462ab791 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -106,6 +106,9 @@ static ssize_t platform_profile_store(struct device *dev,
}
err = cur_profile->profile_set(cur_profile, i);
+ if (!err)
+ sysfs_notify(acpi_kobj, NULL, "platform_profile");
+
mutex_unlock(&profile_lock);
if (err)
return err;