linux-kernel - [PATCH v3 4/4] hwmon: (pmbus/core): Notify hwmon events

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Date:   Wed, 30 Nov 2022 17:59:54 +0100
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     devicetree@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        Naresh Solanki <Naresh.Solanki@...ements.com>
Subject: [PATCH v3 4/4] hwmon: (pmbus/core): Notify hwmon events

Notify hwmon events using the pmbus irq handler.

Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 37 +++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 613e2e484a0f..da92a08484c9 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2805,8 +2805,36 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
 	},
 };
 
+#define to_dev_attr(_dev_attr) \
+	container_of(_dev_attr, struct device_attribute, attr)
+
+static void pmbus_notify(struct pmbus_data *data, int page, int reg, int flags)
+{
+	int i;
+
+	for (i = 0; i < data->num_attributes; i++) {
+		struct device_attribute *da = to_dev_attr(data->group.attrs[i]);
+		struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+		int index = attr->index;
+		u16 smask = pb_index_to_mask(index);
+		u8 spage = pb_index_to_page(index);
+		u16 sreg = pb_index_to_reg(index);
+
+		if (reg == sreg && page == spage && (smask & flags)) {
+			dev_dbg(data->dev, "sysfs notify: %s", da->attr.name);
+			sysfs_notify(&data->dev->kobj, NULL, da->attr.name);
+			kobject_uevent(&data->dev->kobj, KOBJ_CHANGE);
+		}
+
+		flags &= ~smask;
+
+		if (!flags)
+			break;
+	}
+}
+
 static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *error,
-				    unsigned int *event)
+				    unsigned int *event, bool notify)
 {
 	int i, status;
 	const struct pmbus_regulator_status_category *cat;
@@ -2833,6 +2861,9 @@ static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *e
 			return status;
 		}
 
+		if (notify && status)
+			pmbus_notify(data, page, cat->reg, status);
+
 		for (bit = cat->bits; bit->pflag; bit++) {
 			if (status & bit->pflag) {
 				*error |= bit->rflag;
@@ -2885,7 +2916,7 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 {
 	unsigned int event;
 
-	return pmbus_regulator_get_flags(rdev, flags, &event);
+	return pmbus_regulator_get_flags(rdev, flags, &event, false);
 }
 
 static int pmbus_regulator_get_status(struct regulator_dev *rdev)
@@ -3095,7 +3126,7 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
 		if (!data->rdevs[i])
 			continue;
 
-		ret = pmbus_regulator_get_flags(data->rdevs[i], &status, &event);
+		ret = pmbus_regulator_get_flags(data->rdevs[i], &status, &event, true);
 		if (ret)
 			return ret;
 
-- 
2.37.3