[PATCH v3 16/47] mfd: tps6586x: Register with kernel power-off handler

[Guenter Roeck <linux@roeck-us.net>]

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.

Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v3:
- Replace poweroff in all newly introduced variables and in text
  with power_off or power-off as appropriate
- Replace POWEROFF_PRIORITY_xxx with POWER_OFF_PRIORITY_xxx
v2:
- Use define to specify poweroff handler priority
- Use dev_warn instead of dev_err

 drivers/mfd/tps6586x.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
index 8e1dbc4..1e97478 100644
--- a/drivers/mfd/tps6586x.c
+++ b/drivers/mfd/tps6586x.c
@@ -21,10 +21,12 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/notifier.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
 
@@ -133,6 +135,8 @@ struct tps6586x {
 	u32			irq_en;
 	u8			mask_reg[5];
 	struct irq_domain	*irq_domain;
+
+	struct notifier_block	power_off_nb;
 };
 
 static inline struct tps6586x *dev_to_tps6586x(struct device *dev)
@@ -472,13 +476,18 @@ static const struct regmap_config tps6586x_regmap_config = {
 	.cache_type = REGCACHE_RBTREE,
 };
 
-static struct device *tps6586x_dev;
-static void tps6586x_power_off(void)
+static int tps6586x_power_off(struct notifier_block *this,
+			      unsigned long unused1, void *unused2)
 {
-	if (tps6586x_clr_bits(tps6586x_dev, TPS6586X_SUPPLYENE, EXITSLREQ_BIT))
-		return;
+	struct tps6586x *tps6586x = container_of(this, struct tps6586x,
+						 power_off_nb);
+
+	if (tps6586x_clr_bits(tps6586x->dev, TPS6586X_SUPPLYENE, EXITSLREQ_BIT))
+		return NOTIFY_DONE;
 
-	tps6586x_set_bits(tps6586x_dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
+	tps6586x_set_bits(tps6586x->dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
+
+	return NOTIFY_DONE;
 }
 
 static void tps6586x_print_version(struct i2c_client *client, int version)
@@ -575,9 +584,13 @@ static int tps6586x_i2c_probe(struct i2c_client *client,
 		goto err_add_devs;
 	}
 
-	if (pdata->pm_off && !pm_power_off) {
-		tps6586x_dev = &client->dev;
-		pm_power_off = tps6586x_power_off;
+	if (pdata->pm_off) {
+		tps6586x->power_off_nb.notifier_call = tps6586x_power_off;
+		tps6586x->power_off_nb.priority = POWER_OFF_PRIORITY_LOW;
+		ret = register_power_off_handler(&tps6586x->power_off_nb);
+		if (ret)
+			dev_warn(&client->dev,
+				 "failed to register power-off handler\n");
 	}
 
 	return 0;
@@ -594,6 +607,8 @@ static int tps6586x_i2c_remove(struct i2c_client *client)
 {
 	struct tps6586x *tps6586x = i2c_get_clientdata(client);
 
+	unregister_power_off_handler(&tps6586x->power_off_nb);
+
 	tps6586x_remove_subdevs(tps6586x);
 	mfd_remove_devices(tps6586x->dev);
 	if (client->irq)
-- 
1.9.1