linux-kernel - [PATCH RFC] power: reset: restart-poweroff: convert to module

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Message-ID: <20240221174610.3560775-1-alexander.sverdlin@siemens.com>
Date: Wed, 21 Feb 2024 18:46:07 +0100
From: "A. Sverdlin" <alexander.sverdlin@...mens.com>
To: linux-pm@...r.kernel.org
Cc: Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Reichel <sre@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH RFC] power: reset: restart-poweroff: convert to module

From: Alexander Sverdlin <alexander.sverdlin@...mens.com>

The necessity of having a fake platform device for a generic, platform
independent functionality is not obvious.
Some platforms requre device tree modification for this, some would require
ACPI tables modification, while functionality may be useful even to
end-users without required expertise. Convert the platform driver to
a simple module.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
---
This RFC is merely to understand if this approach would be accepted.
Converting to "tristate" could follow or preceed this patch.

diff --git a/drivers/power/reset/restart-poweroff.c b/drivers/power/reset/restart-poweroff.c
index 28f1822db1626..e1d94109f6823 100644
--- a/drivers/power/reset/restart-poweroff.c
+++ b/drivers/power/reset/restart-poweroff.c
@@ -20,7 +20,7 @@ static void restart_poweroff_do_poweroff(void)
 	machine_restart(NULL);
 }
 
-static int restart_poweroff_probe(struct platform_device *pdev)
+static int __init restart_poweroff_init(void)
 {
 	/* If a pm_power_off function has already been added, leave it alone */
 	if (pm_power_off != NULL) {
@@ -33,12 +33,10 @@ static int restart_poweroff_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int restart_poweroff_remove(struct platform_device *pdev)
+static void __exit restart_poweroff_exit(void)
 {
 	if (pm_power_off == &restart_poweroff_do_poweroff)
 		pm_power_off = NULL;
-
-	return 0;
 }
 
 static const struct of_device_id of_restart_poweroff_match[] = {
@@ -47,15 +45,8 @@ static const struct of_device_id of_restart_poweroff_match[] = {
 };
 MODULE_DEVICE_TABLE(of, of_restart_poweroff_match);
 
-static struct platform_driver restart_poweroff_driver = {
-	.probe = restart_poweroff_probe,
-	.remove = restart_poweroff_remove,
-	.driver = {
-		.name = "poweroff-restart",
-		.of_match_table = of_restart_poweroff_match,
-	},
-};
-module_platform_driver(restart_poweroff_driver);
+module_init(restart_poweroff_init);
+module_exit(restart_poweroff_exit);
 
 MODULE_AUTHOR("Andrew Lunn <andrew@...n.ch");
 MODULE_DESCRIPTION("restart poweroff driver");
-- 
2.43.0