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

Guenter Roeck
2014-10-07T05:28:13Z

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