linux-kernel - [PATCH 12/44] mfd: ab8500-sysctrl: Register with kernel poweroff handler

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Message-Id: <1412659726-29957-13-git-send-email-linux@roeck-us.net>
Date:	Mon,  6 Oct 2014 22:28:14 -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>,
	Linus Walleij <linus.walleij@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 12/44] mfd: ab8500-sysctrl: 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: Linus Walleij <linus.walleij@...aro.org>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/mfd/ab8500-sysctrl.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index 8e0dae5..677438f 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -6,6 +6,7 @@
 
 #include <linux/err.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/reboot.h>
@@ -23,7 +24,8 @@
 
 static struct device *sysctrl_dev;
 
-static void ab8500_power_off(void)
+static int ab8500_power_off(struct notifier_block *this, unsigned long unused1,
+			    void *unused2)
 {
 	sigset_t old;
 	sigset_t all;
@@ -34,11 +36,6 @@ static void ab8500_power_off(void)
 	struct power_supply *psy;
 	int ret;
 
-	if (sysctrl_dev == NULL) {
-		pr_err("%s: sysctrl not initialized\n", __func__);
-		return;
-	}
-
 	/*
 	 * If we have a charger connected and we're powering off,
 	 * reboot into charge-only mode.
@@ -83,8 +80,15 @@ shutdown:
 					 AB8500_STW4500CTRL1_SWRESET4500N);
 		(void)sigprocmask(SIG_SETMASK, &old, NULL);
 	}
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block ab8500_poweroff_nb = {
+	.notifier_call = ab8500_power_off,
+	.priority = 64,
+};
+
 /*
  * Use the AB WD to reset the platform. It will perform a hard
  * reset instead of a soft reset. Write the reset reason to
@@ -185,6 +189,7 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
 	struct ab8500_platform_data *plat;
 	struct ab8500_sysctrl_platform_data *pdata;
+	int err;
 
 	plat = dev_get_platdata(pdev->dev.parent);
 
@@ -193,8 +198,9 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 
 	sysctrl_dev = &pdev->dev;
 
-	if (!pm_power_off)
-		pm_power_off = ab8500_power_off;
+	err = register_poweroff_handler(&ab8500_poweroff_nb);
+	if (err)
+		dev_err(&pdev->dev, "Failed to register poweroff handler\n");
 
 	pdata = plat->sysctrl;
 	if (pdata) {
@@ -226,11 +232,9 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 
 static int ab8500_sysctrl_remove(struct platform_device *pdev)
 {
+	unregister_poweroff_handler(&ab8500_poweroff_nb);
 	sysctrl_dev = NULL;
 
-	if (pm_power_off == ab8500_power_off)
-		pm_power_off = NULL;
-
 	return 0;
 }
 
-- 
1.9.1

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