From:   Naresh Solanki <naresh.solanki@9elements.com>
To:     Guenter Roeck <linux@roeck-us.net>,
        Jean Delvare <jdelvare@suse.com>
Cc:     linux-hwmon@vger.kernel.org,
        Naresh Solanki <Naresh.Solanki@9elements.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v4 2/4] hwmon: (pmbus/core) Generalise pmbus get status
Date:   Wed,  1 Mar 2023 17:44:32 +0100
Message-Id: <20230301164434.1928237-2-Naresh.Solanki@9elements.com>
In-Reply-To: <20230301164434.1928237-1-Naresh.Solanki@9elements.com>
References: <20230301164434.1928237-1-Naresh.Solanki@9elements.com>
MIME-Version: 1.0
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Add function pmbus get status that can be used to get both pmbus
specific status & regulator status

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
...
Change in V4
- None
Changes in V3:
- Add pmbus_is_enabled function
Changes in V2:
- Add __maybe attribute for pmbus_get_status function
- Remove unrelated changes
---
 drivers/hwmon/pmbus/pmbus_core.c | 98 ++++++++++++++++++++------------
 1 file changed, 62 insertions(+), 36 deletions(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 1b70cf3be313..f8ac9016ea0e 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2735,18 +2735,12 @@ static const struct pmbus_status_category __maybe_unused pmbus_status_flag_map[]
 	},
 };
 
-#if IS_ENABLED(CONFIG_REGULATOR)
-static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
+static int _pmbus_is_enabled(struct device *dev, u8 page)
 {
-	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 ret;
 
-	mutex_lock(&data->update_lock);
 	ret = _pmbus_read_byte_data(client, page, PMBUS_OPERATION);
-	mutex_unlock(&data->update_lock);
 
 	if (ret < 0)
 		return ret;
@@ -2754,58 +2748,38 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
 	return !!(ret & PB_OPERATION_CONTROL_ON);
 }
 
-static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
+static int __maybe_unused pmbus_is_enabled(struct device *dev, u8 page)
 {
-	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 ret;
 
 	mutex_lock(&data->update_lock);
-	ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
-				     PB_OPERATION_CONTROL_ON,
-				     enable ? PB_OPERATION_CONTROL_ON : 0);
+	ret = _pmbus_is_enabled(dev, page);
 	mutex_unlock(&data->update_lock);
 
-	return ret;
-}
-
-static int pmbus_regulator_enable(struct regulator_dev *rdev)
-{
-	return _pmbus_regulator_on_off(rdev, 1);
-}
-
-static int pmbus_regulator_disable(struct regulator_dev *rdev)
-{
-	return _pmbus_regulator_on_off(rdev, 0);
+	return !!(ret & PB_OPERATION_CONTROL_ON);
 }
 
-static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags)
 {
 	int i, status;
 	const struct pmbus_status_category *cat;
 	const struct pmbus_status_assoc *bit;
-	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);
+	struct device *dev = data->dev;
+	struct i2c_client *client = to_i2c_client(dev);
 	int func = data->info->func[page];
 
 	*flags = 0;
 
-	mutex_lock(&data->update_lock);
-
 	for (i = 0; i < ARRAY_SIZE(pmbus_status_flag_map); i++) {
 		cat = &pmbus_status_flag_map[i];
 		if (!(func & cat->func))
 			continue;
 
 		status = _pmbus_read_byte_data(client, page, cat->reg);
-		if (status < 0) {
-			mutex_unlock(&data->update_lock);
+		if (status < 0)
 			return status;
-		}
 
 		for (bit = cat->bits; bit->pflag; bit++) {
 			if (status & bit->pflag)
@@ -2823,11 +2797,10 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	 * REGULATOR_ERROR_<foo>_WARN.
 	 */
 	status = pmbus_get_status(client, page, PMBUS_STATUS_WORD);
-	mutex_unlock(&data->update_lock);
 	if (status < 0)
 		return status;
 
-	if (pmbus_regulator_is_enabled(rdev)) {
+	if (_pmbus_is_enabled(dev, page)) {
 		if (status & PB_STATUS_OFF)
 			*flags |= REGULATOR_ERROR_FAIL;
 
@@ -2855,6 +2828,59 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	return 0;
 }
 
+static int __maybe_unused pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags)
+{
+	int ret;
+
+	mutex_lock(&data->update_lock);
+	ret = _pmbus_get_flags(data, page, flags);
+	mutex_unlock(&data->update_lock);
+
+	return ret;
+}
+
+#if IS_ENABLED(CONFIG_REGULATOR)
+static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	return pmbus_is_enabled(rdev_get_dev(rdev), rdev_get_id(rdev));
+}
+
+static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
+{
+	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 ret;
+
+	mutex_lock(&data->update_lock);
+	ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
+				     PB_OPERATION_CONTROL_ON,
+				     enable ? PB_OPERATION_CONTROL_ON : 0);
+	mutex_unlock(&data->update_lock);
+
+	return ret;
+}
+
+static int pmbus_regulator_enable(struct regulator_dev *rdev)
+{
+	return _pmbus_regulator_on_off(rdev, 1);
+}
+
+static int pmbus_regulator_disable(struct regulator_dev *rdev)
+{
+	return _pmbus_regulator_on_off(rdev, 0);
+}
+
+static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	return pmbus_get_flags(data, rdev_get_id(rdev), flags);
+}
+
 static int pmbus_regulator_get_status(struct regulator_dev *rdev)
 {
 	struct device *dev = rdev_get_dev(rdev);
-- 
2.39.1