linux-kernel - [PATCH] drivers/regulator: Notify sysfs about status changes

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Message-ID: <20231005133059.917577-1-naresh.solanki@9elements.com>
Date:   Thu,  5 Oct 2023 15:30:58 +0200
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     broonie@...nel.org, zev@...ilderbeest.net,
        Liam Girdwood <lgirdwood@...il.com>
Cc:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        Naresh Solanki <naresh.solanki@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/regulator: Notify sysfs about status changes

From: Patrick Rudolph <patrick.rudolph@...ements.com>

Notify sysfs for state, status & microvolts.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
---
 drivers/regulator/core.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 3137e40fcd3e..ef5fa70ae2f1 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -98,6 +98,10 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
 static void destroy_regulator(struct regulator *regulator);
 static void _regulator_put(struct regulator *regulator);
 
+static struct device_attribute dev_attr_status;
+static struct device_attribute dev_attr_microvolts;
+static struct device_attribute dev_attr_state;
+
 const char *rdev_get_name(struct regulator_dev *rdev)
 {
 	if (rdev->constraints && rdev->constraints->name)
@@ -2798,6 +2802,8 @@ static int _regulator_do_enable(struct regulator_dev *rdev)
 		_regulator_delay_helper(delay);
 	}
 
+	sysfs_notify(&rdev->dev.kobj, NULL, dev_attr_state.attr.name);
+
 	trace_regulator_enable_complete(rdev_get_name(rdev));
 
 	return 0;
@@ -2980,6 +2986,8 @@ static int _regulator_do_disable(struct regulator_dev *rdev)
 	if (rdev->desc->off_on_delay)
 		rdev->last_off = ktime_get_boottime();
 
+	sysfs_notify(&rdev->dev.kobj, NULL, dev_attr_state.attr.name);
+
 	trace_regulator_disable_complete(rdev_get_name(rdev));
 
 	return 0;
@@ -4848,8 +4856,21 @@ EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
 static int _notifier_call_chain(struct regulator_dev *rdev,
 				  unsigned long event, void *data)
 {
+	const char *name;
+	int ret;
+
 	/* call rdev chain first */
-	return blocking_notifier_call_chain(&rdev->notifier, event, data);
+	ret =  blocking_notifier_call_chain(&rdev->notifier, event, data);
+
+	if (event & REGULATOR_EVENT_VOLTAGE_CHANGE) {
+		name = dev_attr_microvolts.attr.name;
+		sysfs_notify(&rdev->dev.kobj, NULL, name);
+	} else {
+		name = dev_attr_status.attr.name;
+		sysfs_notify(&rdev->dev.kobj, NULL, name);
+	}
+
+	return ret;
 }
 
 int _regulator_bulk_get(struct device *dev, int num_consumers,

base-commit: f9a1d31874c383f58bb4f89bfe79b764682cd026
-- 
2.41.0