linux-kernel - [PATCH v4] hwmon: (pmbus/core): Implement regulator get

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Date:   Tue, 22 Nov 2022 10:03:02 +0100
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org,
        Jean Delvare <jdelvare@...e.com>
Cc:     broonie@...nel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        Naresh Solanki <Naresh.Solanki@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4] hwmon: (pmbus/core): Implement regulator get_status

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

Add get_status for pmbus_regulator_ops.

---
Changes:
- use lock throughout the function
- Avoid line continuation upto 100 column
- Optimize use of & and | operator
- Check for VOUT, IOUT, TEMPERATURE bit in status word before checking
  respective status register for fault.
- Report regulator current status.
- Utilize get_error_flag to check for regulator errors.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 41 ++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 7ec04934747e..5df2aee549e6 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2851,6 +2851,46 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	return 0;
 }
 
+static int pmbus_regulator_get_status(struct regulator_dev *rdev)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	u8 page = rdev_get_id(rdev);
+	int status, ret;
+
+	mutex_lock(&data->update_lock);
+	status = pmbus_get_status(client, page, PMBUS_STATUS_WORD);
+	if (status < 0) {
+		ret = status;
+		goto unlock;
+	}
+
+	if (status & PB_STATUS_OFF) {
+		ret = REGULATOR_STATUS_OFF;
+		goto unlock;
+	}
+
+	/* If regulator is ON & reports power good then return ON */
+	if (!(status & PB_STATUS_POWER_GOOD_N)) {
+		ret = REGULATOR_STATUS_ON;
+		goto unlock;
+	}
+
+	if (rdev->desc->ops->get_error_flags)
+		ret = rdev->desc->ops->get_error_flags(rdev, &status);
+
+	if (status & (REGULATOR_ERROR_UNDER_VOLTAGE | REGULATOR_ERROR_OVER_CURRENT |
+	   REGULATOR_ERROR_REGULATION_OUT | REGULATOR_ERROR_FAIL | REGULATOR_ERROR_OVER_TEMP))
+		ret = REGULATOR_STATUS_ERROR;
+	else
+		ret = REGULATOR_STATUS_UNDEFINED;
+
+unlock:
+	mutex_unlock(&data->update_lock);
+	return ret;
+}
+
 static int pmbus_regulator_get_low_margin(struct i2c_client *client, int page)
 {
 	struct pmbus_data *data = i2c_get_clientdata(client);
@@ -2991,6 +3031,7 @@ const struct regulator_ops pmbus_regulator_ops = {
 	.disable = pmbus_regulator_disable,
 	.is_enabled = pmbus_regulator_is_enabled,
 	.get_error_flags = pmbus_regulator_get_error_flags,
+	.get_status = pmbus_regulator_get_status,
 	.get_voltage = pmbus_regulator_get_voltage,
 	.set_voltage = pmbus_regulator_set_voltage,
 	.list_voltage = pmbus_regulator_list_voltage,

base-commit: 27fea302952d8c90cafbdbee96bafeca03544401
-- 
2.37.3