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regulator: userspace-consumer: Add regulator event support

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Add sysfs attribute to track regulator events received from regulator
notifier block handler.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20230803111225.107572-1-Naresh.Solanki@9elements.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Naresh Solanki 2023-08-03 13:12:25 +02:00 • committed by Mark Brown
parent 39b5ba6cb5
commit 22475bcc20
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GPG key ID: 24D68B725D5487D0
1 changed files with 51 additions and 1 deletions
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52
drivers/regulator/userspace-consumer.c
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@ -29,6 +29,10 @@ struct userspace_consumer_data {
int num_supplies; int num_supplies;
struct regulator_bulk_data *supplies; struct regulator_bulk_data *supplies;
struct kobject *kobj;
struct notifier_block nb;
unsigned long events;
}; };
static ssize_t name_show(struct device *dev, 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; 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_RO(name);
static DEVICE_ATTR_RW(state); static DEVICE_ATTR_RW(state);
static DEVICE_ATTR_RO(events);
static struct attribute *attributes[] = { static struct attribute *attributes[] = {
&dev_attr_name.attr, &dev_attr_name.attr,
&dev_attr_state.attr, &dev_attr_state.attr,
&dev_attr_events.attr,
NULL, NULL,
}; };
@ -115,12 +137,28 @@ static const struct attribute_group attr_group = {
.is_visible = attr_visible, .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) static int regulator_userspace_consumer_probe(struct platform_device *pdev)
{ {
struct regulator_userspace_consumer_data tmpdata; struct regulator_userspace_consumer_data tmpdata;
struct regulator_userspace_consumer_data *pdata; struct regulator_userspace_consumer_data *pdata;
struct userspace_consumer_data *drvdata; struct userspace_consumer_data *drvdata;
int ret; int i, ret;
pdata = dev_get_platdata(&pdev->dev); pdata = dev_get_platdata(&pdev->dev);
if (!pdata) { if (!pdata) {
@ -153,6 +191,7 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
drvdata->num_supplies = pdata->num_supplies; drvdata->num_supplies = pdata->num_supplies;
drvdata->supplies = pdata->supplies; drvdata->supplies = pdata->supplies;
drvdata->no_autoswitch = pdata->no_autoswitch; drvdata->no_autoswitch = pdata->no_autoswitch;
drvdata->kobj = &pdev->dev.kobj;
mutex_init(&drvdata->lock); mutex_init(&drvdata->lock);
@ -186,6 +225,13 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
} }
drvdata->enabled = !!ret; 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; return 0;
err_enable: err_enable:
@ -197,6 +243,10 @@ err_enable:
static int regulator_userspace_consumer_remove(struct platform_device *pdev) static int regulator_userspace_consumer_remove(struct platform_device *pdev)
{ {
struct userspace_consumer_data *data = platform_get_drvdata(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); sysfs_remove_group(&pdev->dev.kobj, &attr_group);