linux-kernel - [PATCH 26/44] x86: iris: Register with kernel poweroff handler

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Date:	Mon,  6 Oct 2014 22:28:28 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	adi-buildroot-devel@...ts.sourceforge.net,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	lguest@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-am33-list@...hat.com,
	linux-cris-kernel@...s.com, linux-efi@...r.kernel.org,
	linux-hexagon@...r.kernel.org, linux-m32r-ja@...linux-m32r.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	openipmi-developer@...ts.sourceforge.net,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
	linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
	linux-metag@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-parisc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-sh@...r.kernel.org, xen-devel@...ts.xenproject.org,
	Guenter Roeck <linux@...ck-us.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 26/44] x86: iris: Register with kernel poweroff handler

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with high priority value of 192 to reflect that
the original code overwrites existing poweroff handlers.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/x86/platform/iris/iris.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/arch/x86/platform/iris/iris.c b/arch/x86/platform/iris/iris.c
index 4d171e8..662c4e8 100644
--- a/arch/x86/platform/iris/iris.c
+++ b/arch/x86/platform/iris/iris.c
@@ -23,6 +23,7 @@
 
 #include <linux/moduleparam.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -47,15 +48,21 @@ static bool force;
 module_param(force, bool, 0);
 MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
 
-static void (*old_pm_power_off)(void);
-
-static void iris_power_off(void)
+static int iris_power_off(struct notifier_block *this, unsigned long unused1,
+			  void *unused2)
 {
 	outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
 	msleep(850);
 	outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block iris_poweroff_nb = {
+	.notifier_call = iris_power_off,
+	.priority = 192,
+};
+
 /*
  * Before installing the power_off handler, try to make sure the OS is
  * running on an Iris.  Since Iris does not support DMI, this is done
@@ -65,20 +72,26 @@ static void iris_power_off(void)
 static int iris_probe(struct platform_device *pdev)
 {
 	unsigned char status = inb(IRIS_GIO_INPUT);
+	int ret;
+
 	if (status == IRIS_GIO_NODEV) {
 		printk(KERN_ERR "This machine does not seem to be an Iris. "
 			"Power off handler not installed.\n");
 		return -ENODEV;
 	}
-	old_pm_power_off = pm_power_off;
-	pm_power_off = &iris_power_off;
+
+	ret = register_poweroff_handler(&iris_poweroff_nb);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register poweroff handler\n");
+		return ret;
+	}
 	printk(KERN_INFO "Iris power_off handler installed.\n");
 	return 0;
 }
 
 static int iris_remove(struct platform_device *pdev)
 {
-	pm_power_off = old_pm_power_off;
+	unregister_poweroff_handler(&iris_poweroff_nb);
 	printk(KERN_INFO "Iris power_off handler uninstalled.\n");
 	return 0;
 }
-- 
1.9.1

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