regulator: event: Add regulator netlink event support

This commit introduces netlink event support to the regulator subsystem.

Changes:
- Introduce event.c and regnl.h for netlink event handling.
- Implement reg_generate_netlink_event to broadcast regulator events.
- Update Makefile to include the new event.c file.

Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com>
Link: https://lore.kernel.org/r/20231205105207.1262928-1-naresh.solanki@9elements.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 4aa9ec8c22f3..a968dabb48f5 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -33,6 +33,7 @@
 
 #include "dummy.h"
 #include "internal.h"
+#include "regnl.h"
 
 static DEFINE_WW_CLASS(regulator_ww_class);
 static DEFINE_MUTEX(regulator_nesting_mutex);
@@ -4854,7 +4855,23 @@ static int _notifier_call_chain(struct regulator_dev *rdev,
 				  unsigned long event, void *data)
 {
 	/* call rdev chain first */
-	return blocking_notifier_call_chain(&rdev->notifier, event, data);
+	int ret =  blocking_notifier_call_chain(&rdev->notifier, event, data);
+
+	if (IS_REACHABLE(CONFIG_REGULATOR_NETLINK_EVENTS)) {
+		struct device *parent = rdev->dev.parent;
+		const char *rname = rdev_get_name(rdev);
+		char name[32];
+
+		/* Avoid duplicate debugfs directory names */
+		if (parent && rname == rdev->desc->name) {
+			snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
+				 rname);
+			rname = name;
+		}
+		reg_generate_netlink_event(rname, event);
+	}
+
+	return ret;
 }
 
 int _regulator_bulk_get(struct device *dev, int num_consumers,