linux-kernel - [PATCH v4 13/20] ACPI: platform_profile: Notify change events on register and unregister

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Message-ID: <20241105153316.378-14-mario.limonciello@amd.com>
Date: Tue, 5 Nov 2024 09:33:09 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Hans de Goede <hdegoede@...hat.com>, Ilpo Järvinen
	<ilpo.jarvinen@...ux.intel.com>
CC: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
	Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>, "Shyam
 Sundar S K" <Shyam-sundar.S-k@....com>, Corentin Chary
	<corentin.chary@...il.com>, "Luke D . Jones" <luke@...nes.dev>, Ike Panhc
	<ike.pan@...onical.com>, Henrique de Moraes Holschuh <hmh@....eng.br>,
	"Alexis Belmonte" <alexbelm48@...il.com>, Uwe Kleine-König
	<u.kleine-koenig@...gutronix.de>, Ai Chao <aichao@...inos.cn>, Gergo Koteles
	<soyer@....hu>, open list <linux-kernel@...r.kernel.org>, "open list:ACPI"
	<linux-acpi@...r.kernel.org>, "open list:MICROSOFT SURFACE PLATFORM PROFILE
 DRIVER" <platform-driver-x86@...r.kernel.org>, "open list:THINKPAD ACPI
 EXTRAS DRIVER" <ibm-acpi-devel@...ts.sourceforge.net>, Mark Pearson
	<mpearson-lenovo@...ebb.ca>, Matthew Schwartz <matthew.schwartz@...ux.dev>,
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v4 13/20] ACPI: platform_profile: Notify change events on register and unregister

As multiple platform profile handlers may come and go, send a notification
to userspace each time that a platform profile handler is registered or
unregistered.

Tested-by: Matthew Schwartz <matthew.schwartz@...ux.dev>
Reviewed-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/acpi/platform_profile.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 79083d0bb22e3..c9917daf683cb 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -404,6 +404,7 @@ int platform_profile_register(struct platform_profile_handler *pprof)
 	if (IS_ERR(pprof->class_dev))
 		return PTR_ERR(pprof->class_dev);
 	dev_set_drvdata(pprof->class_dev, pprof);
+	sysfs_notify(acpi_kobj, NULL, "platform_profile");
 
 	cur_profile = pprof;
 	return 0;
@@ -419,7 +420,9 @@ int platform_profile_remove(struct platform_profile_handler *pprof)
 {
 	guard(mutex)(&profile_lock);
 
-	sysfs_remove_group(acpi_kobj, &platform_profile_group);
+	cur_profile = NULL;
+
+	sysfs_notify(acpi_kobj, NULL, "platform_profile");
 
 	device_destroy(&platform_profile_class, MKDEV(0, pprof->minor));
 
-- 
2.43.0