Subject: [PATCH v2 32/45] mfd: retu: Use devm_register_simple_power_off_handler()

From: Dmitry Osipenko <[email-masked]>
Date: Thu, 28 Oct 2021 00:17:02 +0300

Use devm_register_simple_power_off_handler() that replaces global
pm_power_off variable and allows to register multiple power-off handlers.

Signed-off-by: Dmitry Osipenko <[email-masked]>
---
 drivers/mfd/retu-mfd.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c
index c748fd29a220..d18f05c1f095 100644
--- a/drivers/mfd/retu-mfd.c
+++ b/drivers/mfd/retu-mfd.c
@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/reboot.h>
 #include <linux/regmap.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/retu.h>
@@ -81,9 +82,6 @@ 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 const struct resource tahvo_usb_res[] = {
 	{
 		.name	= "tahvo-usb",
@@ -165,12 +163,12 @@ int retu_write(struct retu_dev *rdev, u8 reg, u16 data)
 }
 EXPORT_SYMBOL_GPL(retu_write);
 
-static void retu_power_off(void)
+static void retu_power_off(void *data)
 {
-	struct retu_dev *rdev = retu_pm_power_off;
+	struct retu_dev *rdev = data;
 	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 +181,7 @@ static void retu_power_off(void)
 	for (;;)
 		cpu_relax();
 
-	mutex_unlock(&retu_pm_power_off->mutex);
+	mutex_unlock(&rdev->mutex);
 }
 
 static int retu_regmap_read(void *context, const void *reg, size_t reg_size,
@@ -261,6 +259,17 @@ static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		 (ret & RETU_REG_ASICR_VILMA) ? rdat->companion_name : "",
 		 (ret >> 4) & 0x7, ret & 0xf);
 
+	if (i2c->addr == 1) {
+		ret = devm_register_simple_power_off_handler(&i2c->dev,
+							     retu_power_off,
+							     rdev);
+		if (ret) {
+			dev_err(rdev->dev,
+				"could not register power-off handler: %d\n", ret);
+			return ret;
+		}
+	}
+
 	/* Mask all interrupts. */
 	ret = retu_write(rdev, rdat->irq_chip->mask_base, 0xffff);
 	if (ret < 0)
@@ -279,10 +288,6 @@ 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;
-	}
 
 	return 0;
 }
@@ -291,10 +296,6 @@ 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;
-	}
 	mfd_remove_devices(rdev->dev);
 	regmap_del_irq_chip(i2c->irq, rdev->irq_data);
 
-- 
2.33.1