linux-kernel - [PATCH 17/44] mfd: tps65910: Register with kernel poweroff handler

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Date:	Mon,  6 Oct 2014 22:28:19 -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 17/44] mfd: tps65910: 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/tps65910.c       | 27 ++++++++++++++++++---------
 include/linux/mfd/tps65910.h |  3 +++
 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index f243e75..0b114d3 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -23,6 +23,8 @@
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/mfd/core.h>
+#include <linux/notifier.h>
+#include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/mfd/tps65910.h>
 #include <linux/of.h>
@@ -437,19 +439,20 @@ struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 }
 #endif
 
-static struct i2c_client *tps65910_i2c_client;
-static void tps65910_power_off(void)
+static int tps65910_power_off(struct notifier_block *this,
+			      unsigned long unused1, void *unused2)
 {
-	struct tps65910 *tps65910;
-
-	tps65910 = dev_get_drvdata(&tps65910_i2c_client->dev);
+	struct tps65910 *tps65910 = container_of(this, struct tps65910,
+						 poweroff_nb);
 
 	if (tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
 			DEVCTRL_PWR_OFF_MASK) < 0)
-		return;
+		return NOTIFY_DONE;
 
 	tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 			DEVCTRL_DEV_ON_MASK);
+
+	return NOTIFY_DONE;
 }
 
 static int tps65910_i2c_probe(struct i2c_client *i2c,
@@ -500,9 +503,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	tps65910_ck32k_init(tps65910, pmic_plat_data);
 	tps65910_sleepinit(tps65910, pmic_plat_data);
 
-	if (pmic_plat_data->pm_off && !pm_power_off) {
-		tps65910_i2c_client = i2c;
-		pm_power_off = tps65910_power_off;
+	if (pmic_plat_data->pm_off) {
+		tps65910->poweroff_nb.notifier_call = tps65910_power_off;
+		tps65910->poweroff_nb.priority = 64;
+		ret = register_poweroff_handler(&tps65910->poweroff_nb);
+		if (ret)
+			dev_err(&i2c->dev,
+				"failed to register poweroff handler\n");
 	}
 
 	ret = mfd_add_devices(tps65910->dev, -1,
@@ -522,6 +529,8 @@ static int tps65910_i2c_remove(struct i2c_client *i2c)
 {
 	struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
 
+	unregister_poweroff_handler(&tps65910->poweroff_nb);
+
 	tps65910_irq_exit(tps65910);
 	mfd_remove_devices(tps65910->dev);
 
diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h
index 6483a6f..65cae2c 100644
--- a/include/linux/mfd/tps65910.h
+++ b/include/linux/mfd/tps65910.h
@@ -905,6 +905,9 @@ struct tps65910 {
 	/* IRQ Handling */
 	int chip_irq;
 	struct regmap_irq_chip_data *irq_data;
+
+	/* Poweroff handling */
+	struct notifier_block poweroff_nb;
 };
 
 struct tps65910_platform_data {
-- 
1.9.1

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