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Message-ID: <20230803111225.107572-1-Naresh.Solanki@9elements.com>
Date: Thu, 3 Aug 2023 13:12:25 +0200
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: zev@...ilderbeest.net,
Naresh Solanki <Naresh.Solanki@...ements.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: userspace-consumer: Add regulator event support
Add sysfs attribute to track regulator events received from regulator
notifier block handler.
Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
drivers/regulator/userspace-consumer.c | 52 +++++++++++++++++++++++++-
1 file changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
index 97f075ed68c9..a0b980022993 100644
--- a/drivers/regulator/userspace-consumer.c
+++ b/drivers/regulator/userspace-consumer.c
@@ -29,6 +29,10 @@ 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,
@@ -89,12 +93,30 @@ 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,
};
@@ -115,12 +137,28 @@ 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 ret;
+ int i, ret;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
@@ -153,6 +191,7 @@ 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);
@@ -186,6 +225,13 @@ 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:
@@ -197,6 +243,10 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
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);
base-commit: 4fb53b2377c364e3753d6e293913b57dad68e98b
--
2.41.0
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