linux-kernel - [PATCH 11/44] mfd: retu: Register with kernel poweroff handler

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Date:	Mon,  6 Oct 2014 22:28:13 -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>,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 11/44] mfd: retu: 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: Lee Jones <lee.jones@...aro.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/mfd/retu-mfd.c | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c
index 663f8a3..64b60fa 100644
--- a/drivers/mfd/retu-mfd.c
+++ b/drivers/mfd/retu-mfd.c
@@ -22,6 +22,8 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/retu.h>
@@ -43,6 +45,7 @@ struct retu_dev {
 	struct device			*dev;
 	struct mutex			mutex;
 	struct regmap_irq_chip_data	*irq_data;
+	struct notifier_block		poweroff_nb;
 };
 
 static struct resource retu_pwrbutton_res[] = {
@@ -81,9 +84,6 @@ static struct regmap_irq_chip retu_irq_chip = {
 	.ack_base	= RETU_REG_IDR,
 };
 
-/* Retu device registered for the power off. */
-static struct retu_dev *retu_pm_power_off;
-
 static struct resource tahvo_usb_res[] = {
 	{
 		.name	= "tahvo-usb",
@@ -165,12 +165,14 @@ int retu_write(struct retu_dev *rdev, u8 reg, u16 data)
 }
 EXPORT_SYMBOL_GPL(retu_write);
 
-static void retu_power_off(void)
+static int retu_power_off(struct notifier_block *this, unsigned long unused1,
+			  void *unused2)
 {
-	struct retu_dev *rdev = retu_pm_power_off;
+	struct retu_dev *rdev = container_of(this, struct retu_dev,
+					     poweroff_nb);
 	int reg;
 
-	mutex_lock(&retu_pm_power_off->mutex);
+	mutex_lock(&rdev->mutex);
 
 	/* Ignore power button state */
 	regmap_read(rdev->regmap, RETU_REG_CC1, &reg);
@@ -183,7 +185,9 @@ static void retu_power_off(void)
 	for (;;)
 		cpu_relax();
 
-	mutex_unlock(&retu_pm_power_off->mutex);
+	mutex_unlock(&rdev->mutex);
+
+	return NOTIFY_DONE;
 }
 
 static int retu_regmap_read(void *context, const void *reg, size_t reg_size,
@@ -279,9 +283,13 @@ static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		return ret;
 	}
 
-	if (i2c->addr == 1 && !pm_power_off) {
-		retu_pm_power_off = rdev;
-		pm_power_off	  = retu_power_off;
+	if (i2c->addr == 1) {
+		rdev->poweroff_nb.notifier_call = retu_power_off;
+		rdev->poweroff_nb.priority = 64;
+		ret = register_poweroff_handler(&rdev->poweroff_nb);
+		if (ret)
+			dev_err(rdev->dev,
+				"Failed to register poweroff handler\n");
 	}
 
 	return 0;
@@ -291,10 +299,7 @@ static int retu_remove(struct i2c_client *i2c)
 {
 	struct retu_dev *rdev = i2c_get_clientdata(i2c);
 
-	if (retu_pm_power_off == rdev) {
-		pm_power_off	  = NULL;
-		retu_pm_power_off = NULL;
-	}
+	unregister_poweroff_handler(&rdev->poweroff_nb);
 	mfd_remove_devices(rdev->dev);
 	regmap_del_irq_chip(i2c->irq, rdev->irq_data);
 
-- 
1.9.1

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