[PATCH v2 28/45] mfd: rn5t618: Use devm_register_power_handler()

[Dmitry Osipenko]

Use devm_register_power_handler() that replaces global pm_power_off
variable and allows to register multiple power-off handlers. It also
provides restart-handler support, i.e. all in one API.

Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
 drivers/mfd/rn5t618.c | 56 ++++++++++++++++---------------------------
 1 file changed, 21 insertions(+), 35 deletions(-)

diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
index 384acb459427..12d7b2339bbe 100644
--- a/drivers/mfd/rn5t618.c
+++ b/drivers/mfd/rn5t618.c
@@ -84,9 +84,6 @@ static const struct regmap_irq_chip rc5t619_irq_chip = {
 	.mask_invert = true,
 };
 
-static struct i2c_client *rn5t618_pm_power_off;
-static struct notifier_block rn5t618_restart_handler;
-
 static int rn5t618_irq_init(struct rn5t618 *rn5t618)
 {
 	const struct regmap_irq_chip *irq_chip = NULL;
@@ -115,7 +112,9 @@ static int rn5t618_irq_init(struct rn5t618 *rn5t618)
 	return ret;
 }
 
-static void rn5t618_trigger_poweroff_sequence(bool repower)
+static void
+rn5t618_trigger_poweroff_sequence(struct i2c_client *rn5t618_pm_power_off,
+				  bool repower)
 {
 	int ret;
 
@@ -151,25 +150,31 @@ static void rn5t618_trigger_poweroff_sequence(bool repower)
 	dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
 }
 
-static void rn5t618_power_off(void)
+static void rn5t618_power_off(struct power_off_data *data)
 {
-	rn5t618_trigger_poweroff_sequence(false);
+	struct i2c_client *client = data->cb_data;
+
+	rn5t618_trigger_poweroff_sequence(client, false);
 }
 
-static int rn5t618_restart(struct notifier_block *this,
-			    unsigned long mode, void *cmd)
+static void rn5t618_restart(struct restart_data *data)
 {
-	rn5t618_trigger_poweroff_sequence(true);
+	struct i2c_client *client = data->cb_data;
+
+	rn5t618_trigger_poweroff_sequence(client, true);
 
 	/*
 	 * Re-power factor detection on PMIC side is not instant. 1ms
 	 * proved to be enough time until reset takes effect.
 	 */
 	mdelay(1);
-
-	return NOTIFY_DONE;
 }
 
+static struct power_handler rn5t618_power_handler = {
+	.restart_cb = rn5t618_restart,
+	.restart_priority = RESTART_PRIO_HIGH,
+};
+
 static const struct of_device_id rn5t618_of_match[] = {
 	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
 	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
@@ -221,38 +226,20 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c)
 		return ret;
 	}
 
-	rn5t618_pm_power_off = i2c;
-	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
-		if (!pm_power_off)
-			pm_power_off = rn5t618_power_off;
-		else
-			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
-	}
+	if (of_device_is_system_power_controller(i2c->dev.of_node))
+		rn5t618_power_handler.power_off_cb = rn5t618_power_off;
 
-	rn5t618_restart_handler.notifier_call = rn5t618_restart;
-	rn5t618_restart_handler.priority = 192;
+	rn5t618_power_handler.cb_data = i2c;
 
-	ret = register_restart_handler(&rn5t618_restart_handler);
+	ret = devm_register_power_handler(&i2c->dev, &rn5t618_power_handler);
 	if (ret) {
-		dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
+		dev_err(&i2c->dev, "failed to register power handler: %d\n", ret);
 		return ret;
 	}
 
 	return rn5t618_irq_init(priv);
 }
 
-static int rn5t618_i2c_remove(struct i2c_client *i2c)
-{
-	if (i2c == rn5t618_pm_power_off) {
-		rn5t618_pm_power_off = NULL;
-		pm_power_off = NULL;
-	}
-
-	unregister_restart_handler(&rn5t618_restart_handler);
-
-	return 0;
-}
-
 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
 {
 	struct rn5t618 *priv = dev_get_drvdata(dev);
@@ -284,7 +271,6 @@ static struct i2c_driver rn5t618_i2c_driver = {
 		.pm = &rn5t618_i2c_dev_pm_ops,
 	},
 	.probe_new = rn5t618_i2c_probe,
-	.remove = rn5t618_i2c_remove,
 };
 
 module_i2c_driver(rn5t618_i2c_driver);
-- 
2.33.1