linux-kernel - [PATCH 22/44] power/reset: as3722-poweroff: Register with kernel poweroff handler

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Date:	Mon,  6 Oct 2014 22:28:24 -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>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH 22/44] power/reset: as3722-poweroff: Register with kernel poweroff handler

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with a low priority value of 64 to reflect that
the original code only sets pm_power_off if it was not already set.

Cc: Sebastian Reichel <sre@...nel.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/power/reset/as3722-poweroff.c | 36 ++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/power/reset/as3722-poweroff.c b/drivers/power/reset/as3722-poweroff.c
index 6849711..7ebaed9 100644
--- a/drivers/power/reset/as3722-poweroff.c
+++ b/drivers/power/reset/as3722-poweroff.c
@@ -17,32 +17,33 @@
 
 #include <linux/mfd/as3722.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/slab.h>
 
 struct as3722_poweroff {
 	struct device *dev;
 	struct as3722 *as3722;
+	struct notifier_block poweroff_nb;
 };
 
-static struct as3722_poweroff *as3722_pm_poweroff;
-
-static void as3722_pm_power_off(void)
+static int as3722_power_off(struct notifier_block *this, unsigned long unused1,
+			    void *unused2)
 {
+	struct as3722_poweroff *as3722_poweroff =
+		container_of(this, struct as3722_poweroff, poweroff_nb);
 	int ret;
 
-	if (!as3722_pm_poweroff) {
-		pr_err("AS3722 poweroff is not initialised\n");
-		return;
-	}
-
-	ret = as3722_update_bits(as3722_pm_poweroff->as3722,
+	ret = as3722_update_bits(as3722_poweroff->as3722,
 		AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF);
 	if (ret < 0)
-		dev_err(as3722_pm_poweroff->dev,
+		dev_err(as3722_poweroff->dev,
 			"RESET_CONTROL_REG update failed, %d\n", ret);
+
+	return NOTIFY_DONE;
 }
 
 static int as3722_poweroff_probe(struct platform_device *pdev)
@@ -63,18 +64,19 @@ static int as3722_poweroff_probe(struct platform_device *pdev)
 
 	as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent);
 	as3722_poweroff->dev = &pdev->dev;
-	as3722_pm_poweroff = as3722_poweroff;
-	if (!pm_power_off)
-		pm_power_off = as3722_pm_power_off;
+	as3722_poweroff->poweroff_nb.notifier_call = as3722_power_off;
+	as3722_poweroff->poweroff_nb.priority = 64;
 
-	return 0;
+	platform_set_drvdata(pdev, as3722_poweroff);
+
+	return register_poweroff_handler(&as3722_poweroff->poweroff_nb);
 }
 
 static int as3722_poweroff_remove(struct platform_device *pdev)
 {
-	if (pm_power_off == as3722_pm_power_off)
-		pm_power_off = NULL;
-	as3722_pm_poweroff = NULL;
+	struct as3722_poweroff *as3722_poweroff = platform_get_drvdata(pdev);
+
+	unregister_poweroff_handler(&as3722_poweroff->poweroff_nb);
 
 	return 0;
 }
-- 
1.9.1

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