linux-kernel - [PATCH 14/44] mfd: tps80031: Register with kernel poweroff handler

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Message-Id: <1412659726-29957-15-git-send-email-linux@roeck-us.net>
Date:	Mon,  6 Oct 2014 22:28:16 -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>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 14/44] mfd: tps80031: 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: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/mfd/tps80031.c       | 30 ++++++++++++++++++------------
 include/linux/mfd/tps80031.h |  2 ++
 2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/mfd/tps80031.c b/drivers/mfd/tps80031.c
index ed6c5b0..24625a6 100644
--- a/drivers/mfd/tps80031.c
+++ b/drivers/mfd/tps80031.c
@@ -147,7 +147,6 @@ static const struct tps80031_pupd_data tps80031_pupds[] = {
 	[TPS80031_CTLI2C_SCL]		= PUPD_DATA(4, 0,	BIT(2)),
 	[TPS80031_CTLI2C_SDA]		= PUPD_DATA(4, 0,	BIT(3)),
 };
-static struct tps80031 *tps80031_power_off_dev;
 
 int tps80031_ext_power_req_config(struct device *dev,
 		unsigned long ext_ctrl_flag, int preq_bit,
@@ -209,11 +208,17 @@ int tps80031_ext_power_req_config(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(tps80031_ext_power_req_config);
 
-static void tps80031_power_off(void)
+static int tps80031_power_off(struct notifier_block *this,
+			      unsigned long unused1, void *unused2)
 {
-	dev_info(tps80031_power_off_dev->dev, "switching off PMU\n");
-	tps80031_write(tps80031_power_off_dev->dev, TPS80031_SLAVE_ID1,
-				TPS80031_PHOENIX_DEV_ON, TPS80031_DEVOFF);
+	struct tps80031 *tps80031 = container_of(this, struct tps80031,
+						 poweroff_nb);
+
+	dev_info(tps80031->dev, "switching off PMU\n");
+	tps80031_write(tps80031->dev, TPS80031_SLAVE_ID1,
+		       TPS80031_PHOENIX_DEV_ON, TPS80031_DEVOFF);
+
+	return NOTIFY_DONE;
 }
 
 static void tps80031_pupd_init(struct tps80031 *tps80031,
@@ -501,9 +506,13 @@ static int tps80031_probe(struct i2c_client *client,
 		goto fail_mfd_add;
 	}
 
-	if (pdata->use_power_off && !pm_power_off) {
-		tps80031_power_off_dev = tps80031;
-		pm_power_off = tps80031_power_off;
+	if (pdata->use_power_off) {
+		tps80031->poweroff_nb.notifier_call = tps80031_power_off;
+		tps80031->poweroff_nb.priority = 64;
+		ret = register_poweroff_handler(&tps80031->poweroff_nb);
+		if (ret)
+			dev_err(&client->dev,
+				"Failed to register poweroff handler\n");
 	}
 	return 0;
 
@@ -523,10 +532,7 @@ static int tps80031_remove(struct i2c_client *client)
 	struct tps80031 *tps80031 = i2c_get_clientdata(client);
 	int i;
 
-	if (tps80031_power_off_dev == tps80031) {
-		tps80031_power_off_dev = NULL;
-		pm_power_off = NULL;
-	}
+	unregister_poweroff_handler(&tps80031->poweroff_nb);
 
 	mfd_remove_devices(tps80031->dev);
 
diff --git a/include/linux/mfd/tps80031.h b/include/linux/mfd/tps80031.h
index 2c75c9c..49bc006 100644
--- a/include/linux/mfd/tps80031.h
+++ b/include/linux/mfd/tps80031.h
@@ -24,6 +24,7 @@
 #define __LINUX_MFD_TPS80031_H
 
 #include <linux/device.h>
+#include <linux/notifier.h>
 #include <linux/regmap.h>
 
 /* Pull-ups/Pull-downs */
@@ -513,6 +514,7 @@ struct tps80031 {
 	struct i2c_client	*clients[TPS80031_NUM_SLAVES];
 	struct regmap		*regmap[TPS80031_NUM_SLAVES];
 	struct regmap_irq_chip_data *irq_data;
+	struct notifier_block	poweroff_nb;
 };
 
 struct tps80031_pupd_init_data {
-- 
1.9.1

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