From b96c22476ff4bc3459933f87ba52cbb7910ffc6b Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@kernel.org>
Date: Thu, 24 Aug 2023 23:48:22 +0100
Subject: [PATCH] regulator: userspace-consumer: Drop event support for this
 cycle

Drop commit 22475bcc2083 ("regulator: userspace-consumer: Add regulator
event support") since Zev Weiss points out that it leaks the constants
we use for notifications out as ABI which isn't ideal, we should have
something more abstracted there.  There's a definite need for this
feature but it needs some more work on the interface.

Signed-off-by: Mark Brown <broonie@kernel.org
Link: https://lore.kernel.org/r/20230824-regulator-remove-status-sysfs-v1-1-554956e8c1ca@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org
---
 drivers/regulator/userspace-consumer.c | 52 +---------------------------------
 1 file changed, 1 insertion(+), 51 deletions(-)

diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
index a0b9800..97f075e 100644
--- a/drivers/regulator/userspace-consumer.c
+++ b/drivers/regulator/userspace-consumer.c
@@ -29,10 +29,6 @@ struct userspace_consumer_data {
 
 	int num_supplies;
 	struct regulator_bulk_data *supplies;
-
-	struct kobject *kobj;
-	struct notifier_block nb;
-	unsigned long events;
 };
 
 static ssize_t name_show(struct device *dev,
@@ -93,30 +89,12 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
-static DEFINE_MUTEX(events_lock);
-
-static ssize_t events_show(struct device *dev,
-			   struct device_attribute *attr, char *buf)
-{
-	struct userspace_consumer_data *data = dev_get_drvdata(dev);
-	unsigned long e;
-
-	mutex_lock(&events_lock);
-	e = data->events;
-	data->events = 0;
-	mutex_unlock(&events_lock);
-
-	return sprintf(buf, "0x%lx\n", e);
-}
-
 static DEVICE_ATTR_RO(name);
 static DEVICE_ATTR_RW(state);
-static DEVICE_ATTR_RO(events);
 
 static struct attribute *attributes[] = {
 	&dev_attr_name.attr,
 	&dev_attr_state.attr,
-	&dev_attr_events.attr,
 	NULL,
 };
 
@@ -137,28 +115,12 @@ static const struct attribute_group attr_group = {
 	.is_visible =  attr_visible,
 };
 
-static int regulator_userspace_notify(struct notifier_block *nb,
-				      unsigned long event,
-				      void *ignored)
-{
-	struct userspace_consumer_data *data =
-		container_of(nb, struct userspace_consumer_data, nb);
-
-	mutex_lock(&events_lock);
-	data->events |= event;
-	mutex_unlock(&events_lock);
-
-	sysfs_notify(data->kobj, NULL, dev_attr_events.attr.name);
-
-	return NOTIFY_OK;
-}
-
 static int regulator_userspace_consumer_probe(struct platform_device *pdev)
 {
 	struct regulator_userspace_consumer_data tmpdata;
 	struct regulator_userspace_consumer_data *pdata;
 	struct userspace_consumer_data *drvdata;
-	int i, ret;
+	int ret;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (!pdata) {
@@ -191,7 +153,6 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
 	drvdata->num_supplies = pdata->num_supplies;
 	drvdata->supplies = pdata->supplies;
 	drvdata->no_autoswitch = pdata->no_autoswitch;
-	drvdata->kobj = &pdev->dev.kobj;
 
 	mutex_init(&drvdata->lock);
 
@@ -225,13 +186,6 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
 	}
 	drvdata->enabled = !!ret;
 
-	drvdata->nb.notifier_call = regulator_userspace_notify;
-	for (i = 0; i < drvdata->num_supplies; i++) {
-		ret = devm_regulator_register_notifier(drvdata->supplies[i].consumer, &drvdata->nb);
-		if (ret)
-			goto err_enable;
-	}
-
 	return 0;
 
 err_enable:
@@ -243,10 +197,6 @@ err_enable:
 static int regulator_userspace_consumer_remove(struct platform_device *pdev)
 {
 	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
-	int i;
-
-	for (i = 0; i < data->num_supplies; i++)
-		devm_regulator_unregister_notifier(data->supplies[i].consumer, &data->nb);
 
 	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
 
-- 
2.7.4