[PATCH v2] hwmon: Add static visibility member to struct hwmon_ops

[Heiner Kallweit <hkallweit1@xxxxxxxxx>]

Several drivers return the same static value in their is_visible
callback, what results in code duplication. Therefore add an option
for drivers to specify a static visibility directly.

Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
v2:
- improved is_visible description
---
 drivers/hwmon/hwmon.c | 19 +++++++++++++++----
 include/linux/hwmon.h |  5 ++++-
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 9c35c4d03..8e9159e8d 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -145,6 +145,17 @@ static const struct class hwmon_class = {
 
 static DEFINE_IDA(hwmon_ida);
 
+static umode_t hwmon_ops_is_visible(const struct hwmon_ops *ops,
+				    const void *drvdata,
+				    enum hwmon_sensor_types type,
+				    u32 attr, int channel)
+{
+	if (ops->visible)
+		return ops->visible;
+
+	return ops->is_visible(drvdata, type, attr, channel);
+}
+
 /* Thermal zone handling */
 
 /*
@@ -267,8 +278,8 @@ static int hwmon_thermal_register_sensors(struct device *dev)
 			int err;
 
 			if (!(info[i]->config[j] & HWMON_T_INPUT) ||
-			    !chip->ops->is_visible(drvdata, hwmon_temp,
-						   hwmon_temp_input, j))
+			    !hwmon_ops_is_visible(chip->ops, drvdata, hwmon_temp,
+						  hwmon_temp_input, j))
 				continue;
 
 			err = hwmon_thermal_add_sensor(dev, j);
@@ -506,7 +517,7 @@ static struct attribute *hwmon_genattr(const void *drvdata,
 	const char *name;
 	bool is_string = is_string_attr(type, attr);
 
-	mode = ops->is_visible(drvdata, type, attr, index);
+	mode = hwmon_ops_is_visible(ops, drvdata, type, attr, index);
 	if (!mode)
 		return ERR_PTR(-ENOENT);
 
@@ -1033,7 +1044,7 @@ hwmon_device_register_with_info(struct device *dev, const char *name,
 	if (!dev || !name || !chip)
 		return ERR_PTR(-EINVAL);
 
-	if (!chip->ops || !chip->ops->is_visible || !chip->info)
+	if (!chip->ops || !(chip->ops->visible || chip->ops->is_visible) || !chip->info)
 		return ERR_PTR(-EINVAL);
 
 	return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
index 5c6a421ad..3a63dff62 100644
--- a/include/linux/hwmon.h
+++ b/include/linux/hwmon.h
@@ -368,7 +368,9 @@ enum hwmon_intrusion_attributes {
 
 /**
  * struct hwmon_ops - hwmon device operations
- * @is_visible: Callback to return attribute visibility. Mandatory.
+ * @visible:	Static visibility. If non-zero, 'is_visible' is ignored.
+ * @is_visible: Callback to return attribute visibility. Mandatory unless
+ *		'visible' is non-zero.
  *		Parameters are:
  *		@const void *drvdata:
  *			Pointer to driver-private data structure passed
@@ -412,6 +414,7 @@ enum hwmon_intrusion_attributes {
  *		The function returns 0 on success or a negative error number.
  */
 struct hwmon_ops {
+	umode_t visible;
 	umode_t (*is_visible)(const void *drvdata, enum hwmon_sensor_types type,
 			      u32 attr, int channel);
 	int (*read)(struct device *dev, enum hwmon_sensor_types type,
-- 
2.47.0