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

Guenter Roeck
2014-10-07T05:28:14Z

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@linaro.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-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