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Date:	Sun,  9 Nov 2014 17:42:29 -0800
From:	Guenter Roeck <>
Cc:, Guenter Roeck <>,
	Linus Walleij <>,
	Lee Jones <>,
	Samuel Ortiz <>,
Subject: [PATCH v6 12/48] mfd: ab8500-sysctrl: Register with kernel power-off handler

Register with kernel power-off handler instead of setting pm_power_off
directly. Register with low priority to reflect that the original code
only sets pm_power_off if it was not already set.

sysctrl_dev is set prior to power-off handler registration, and the
power-off handler is unregistered prior to clearing sysrctrl_dev.
It is therefore not necessary to check if sysctrl_dev is NULL in the
power-off handler, and the check was removed. Setting sysctrl_dev to NULL
in the remove function was also removed as unnecessary. With those changes,
devm_register_power_off_handler can be used to register the poeroff handler.
The now empty remove function was retained since the ab8500_restart function,
which is currently unused, would likely need some cleanup if it was ever used.

Cc: Linus Walleij <>
Cc: Lee Jones <>
Cc: Samuel Ortiz <>
Acked-by: Lee Jones <>
Acked-by: Linus Walleij <>
Signed-off-by: Guenter Roeck <>
- Moved ab8500_power_off_hb to avoid conflict in -next.
  Global: Replaced priority defines with enum.
- Rebase to v3.18-rc3
- Do not use notifiers but internal functions and data structures to manage
  the list of power-off handlers. Drop unused parameters from callbacks, and
  make the power-off function type void
- Replace poweroff in all newly introduced variables and in text
  with power_off or power-off as appropriate
- Use define to specify poweroff handler priority
- Use devm_register_power_off_handler
- Use dev_warn instead of dev_err
- Since we use devm_register_power_off_handler,
  we need to check if sysctrl_dev in the poweroff handler to avoid
  a race condition on unload, so this check is no longer removed

 drivers/mfd/ab8500-sysctrl.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index 8e0dae5..064821e 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -23,7 +23,7 @@
 static struct device *sysctrl_dev;
-static void ab8500_power_off(void)
+static void ab8500_power_off(struct power_off_handler_block *this)
 	sigset_t old;
 	sigset_t all;
@@ -180,11 +180,17 @@ int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
+static struct power_off_handler_block ab8500_power_off_hb = {
+	.handler = ab8500_power_off,
 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 +199,10 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 	sysctrl_dev = &pdev->dev;
-	if (!pm_power_off)
-		pm_power_off = ab8500_power_off;
+	err = devm_register_power_off_handler(sysctrl_dev,
+					      &ab8500_power_off_hb);
+	if (err)
+		dev_warn(&pdev->dev, "Failed to register power-off handler\n");
 	pdata = plat->sysctrl;
 	if (pdata) {
@@ -228,9 +236,6 @@ static int ab8500_sysctrl_remove(struct platform_device *pdev)
 	sysctrl_dev = NULL;
-	if (pm_power_off == ab8500_power_off)
-		pm_power_off = NULL;
 	return 0;

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