[PATCH v2 0/3] (ftsteutates) Various fixes

[PATCH v2 0/3] (ftsteutates) Various fixes

[Armin Wolf]

This patch series contains the missing changes from the previous series.

The first patch converts the driver to use the modern *_with_info() API,
while the second patch replaces the nonstandard fanX_source attributes
with standard pwmX_auto_channels_temp attributes. Since the behaviour of
the pwmX_auto_channels_temp attributes is a bit special with the teutates BMC,
it is added to the drivers documentation. The last patch adds support
for fanX_fault attributes, using information already available inside
the driver but not exported to userspace.

Changes since v1:
- Omit patches regarding the scaling of measurements and watchdog
  registration
- Split the patch regarding the API conversion into three separate
  patches
- introduce FTS_FAN_SOURCE_INVALID so the pwmX_auto_channels_temp
  attributes display proper values for unconnected fans

Armin Wolf (3):
  hwmon: (ftsteutates) Convert to devm_hwmon_device_register_with_info()
  hwmon: (ftsteutates) Replace fanX_source with pwmX_auto_channels_temp
  hwmon: (ftsteutates) Add support for fanX_fault attributes

 Documentation/hwmon/ftsteutates.rst |   5 +
 drivers/hwmon/ftsteutates.c         | 550 +++++++++++-----------------
 2 files changed, 210 insertions(+), 345 deletions(-)

--
2.30.2

[PATCH v2 1/3] hwmon: (ftsteutates) Convert to devm_hwmon_device_register_with_info()

[Armin Wolf]

Convert driver to use devm_hwmon_device_register_with_info()
to reduce module size by ~30%.

Tested on a Fujitsu DS3401-B1.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/hwmon/ftsteutates.c | 532 ++++++++++++++----------------------
 1 file changed, 204 insertions(+), 328 deletions(-)

diff --git a/drivers/hwmon/ftsteutates.c b/drivers/hwmon/ftsteutates.c
index e860924f90aa..23dc3a74f84b 100644
--- a/drivers/hwmon/ftsteutates.c
+++ b/drivers/hwmon/ftsteutates.c
@@ -17,7 +17,6 @@
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
-#include <linux/uaccess.h>
 #include <linux/watchdog.h>

 #define FTS_DEVICE_ID_REG		0x0000
@@ -340,376 +339,255 @@ static int fts_watchdog_init(struct fts_data *data)
 	return devm_watchdog_register_device(&data->client->dev, &data->wdd);
 }

-/*****************************************************************************/
-/* SysFS handler functions						     */
-/*****************************************************************************/
-static ssize_t in_value_show(struct device *dev,
-			     struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int value, err;
-
-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
-
-	value = DIV_ROUND_CLOSEST(data->volt[index] * 3300, 255);
-
-	return sprintf(buf, "%d\n", value);
-}
-
-static ssize_t temp_value_show(struct device *dev,
+static ssize_t fan_source_show(struct device *dev,
 			       struct device_attribute *devattr, char *buf)
 {
 	struct fts_data *data = dev_get_drvdata(dev);
 	int index = to_sensor_dev_attr(devattr)->index;
-	int value, err;
+	int err;

 	err = fts_update_device(data);
 	if (err < 0)
 		return err;

-	value = (data->temp_input[index] - 64) * 1000;
-
-	return sprintf(buf, "%d\n", value);
+	return sprintf(buf, "%u\n", data->fan_source[index]);
 }

-static ssize_t temp_fault_show(struct device *dev,
-			       struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int err;
+static SENSOR_DEVICE_ATTR_RO(fan1_source, fan_source, 0);
+static SENSOR_DEVICE_ATTR_RO(fan2_source, fan_source, 1);
+static SENSOR_DEVICE_ATTR_RO(fan3_source, fan_source, 2);
+static SENSOR_DEVICE_ATTR_RO(fan4_source, fan_source, 3);
+static SENSOR_DEVICE_ATTR_RO(fan5_source, fan_source, 4);
+static SENSOR_DEVICE_ATTR_RO(fan6_source, fan_source, 5);
+static SENSOR_DEVICE_ATTR_RO(fan7_source, fan_source, 6);
+static SENSOR_DEVICE_ATTR_RO(fan8_source, fan_source, 7);

-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
+static struct attribute *fts_fan_attrs[] = {
+	&sensor_dev_attr_fan1_source.dev_attr.attr,
+	&sensor_dev_attr_fan2_source.dev_attr.attr,
+	&sensor_dev_attr_fan3_source.dev_attr.attr,
+	&sensor_dev_attr_fan4_source.dev_attr.attr,
+	&sensor_dev_attr_fan5_source.dev_attr.attr,
+	&sensor_dev_attr_fan6_source.dev_attr.attr,
+	&sensor_dev_attr_fan7_source.dev_attr.attr,
+	&sensor_dev_attr_fan8_source.dev_attr.attr,
+	NULL
+};

-	/* 00h Temperature = Sensor Error */
-	return sprintf(buf, "%d\n", data->temp_input[index] == 0);
-}
+static const struct attribute_group fts_attr_group = {
+	.attrs = fts_fan_attrs
+};

-static ssize_t temp_alarm_show(struct device *dev,
-			       struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int err;
+static const struct attribute_group *fts_attr_groups[] = {
+	&fts_attr_group,
+	NULL
+};

-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
+static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type, u32 attr,
+			      int channel)
+{
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+		case hwmon_temp_fault:
+			return 0444;
+		case hwmon_temp_alarm:
+			return 0644;
+		default:
+			break;
+		}
+		break;
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_input:
+			return 0444;
+		case hwmon_fan_alarm:
+			return 0644;
+		default:
+			break;
+		}
+		break;
+	case hwmon_in:
+		return 0444;
+	default:
+		break;
+	}

-	return sprintf(buf, "%u\n", !!(data->temp_alarm & BIT(index)));
+	return 0;
 }

-static ssize_t
-temp_alarm_store(struct device *dev, struct device_attribute *devattr,
-		 const char *buf, size_t count)
+static int fts_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+		    long *val)
 {
 	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	long ret;
+	int ret = fts_update_device(data);

-	ret = fts_update_device(data);
 	if (ret < 0)
 		return ret;

-	if (kstrtoul(buf, 10, &ret) || ret != 0)
-		return -EINVAL;
-
-	mutex_lock(&data->update_lock);
-	ret = fts_read_byte(data->client, FTS_REG_TEMP_CONTROL(index));
-	if (ret < 0)
-		goto error;
-
-	ret = fts_write_byte(data->client, FTS_REG_TEMP_CONTROL(index),
-			     ret | 0x1);
-	if (ret < 0)
-		goto error;
-
-	data->valid = false;
-	ret = count;
-error:
-	mutex_unlock(&data->update_lock);
-	return ret;
-}
-
-static ssize_t fan_value_show(struct device *dev,
-			      struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int value, err;
-
-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
-
-	value = data->fan_input[index] * 60;
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			*val = (data->temp_input[channel] - 64) * 1000;

-	return sprintf(buf, "%d\n", value);
-}
+			return 0;
+		case hwmon_temp_alarm:
+			*val = !!(data->temp_alarm & BIT(channel));

-static ssize_t fan_source_show(struct device *dev,
-			       struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int err;
+			return 0;
+		case hwmon_temp_fault:
+			/* 00h Temperature = Sensor Error */;
+			*val = (data->temp_input[channel] == 0);

-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
+			return 0;
+		default:
+			break;
+		}
+		break;
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_input:
+			*val = data->fan_input[channel] * 60;

-	return sprintf(buf, "%u\n", data->fan_source[index]);
-}
+			return 0;
+		case hwmon_fan_alarm:
+			*val = !!(data->fan_alarm & BIT(channel));

-static ssize_t fan_alarm_show(struct device *dev,
-			      struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int err;
+			return 0;
+		default:
+			break;
+		}
+		break;
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_input:
+			*val = DIV_ROUND_CLOSEST(data->volt[channel] * 3300, 255);

-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
+			return 0;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}

-	return sprintf(buf, "%d\n", !!(data->fan_alarm & BIT(index)));
+	return -EOPNOTSUPP;
 }

-static ssize_t
-fan_alarm_store(struct device *dev, struct device_attribute *devattr,
-		const char *buf, size_t count)
+static int fts_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+		     long val)
 {
 	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	long ret;
+	int ret = fts_update_device(data);

-	ret = fts_update_device(data);
 	if (ret < 0)
 		return ret;

-	if (kstrtoul(buf, 10, &ret) || ret != 0)
-		return -EINVAL;
-
-	mutex_lock(&data->update_lock);
-	ret = fts_read_byte(data->client, FTS_REG_FAN_CONTROL(index));
-	if (ret < 0)
-		goto error;
-
-	ret = fts_write_byte(data->client, FTS_REG_FAN_CONTROL(index),
-			     ret | 0x1);
-	if (ret < 0)
-		goto error;
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_alarm:
+			if (val)
+				return -EINVAL;
+
+			mutex_lock(&data->update_lock);
+			ret = fts_read_byte(data->client, FTS_REG_TEMP_CONTROL(channel));
+			if (ret >= 0)
+				ret = fts_write_byte(data->client, FTS_REG_TEMP_CONTROL(channel),
+						     ret | 0x1);
+			if (ret >= 0)
+				data->valid = false;
+
+			mutex_unlock(&data->update_lock);
+			if (ret < 0)
+				return ret;
+
+			return 0;
+		default:
+			break;
+		}
+		break;
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_alarm:
+			if (val)
+				return -EINVAL;
+
+			mutex_lock(&data->update_lock);
+			ret = fts_read_byte(data->client, FTS_REG_FAN_CONTROL(channel));
+			if (ret >= 0)
+				ret = fts_write_byte(data->client, FTS_REG_FAN_CONTROL(channel),
+						     ret | 0x1);
+			if (ret >= 0)
+				data->valid = false;
+
+			mutex_unlock(&data->update_lock);
+			if (ret < 0)
+				return ret;
+
+			return 0;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}

-	data->valid = false;
-	ret = count;
-error:
-	mutex_unlock(&data->update_lock);
-	return ret;
+	return -EOPNOTSUPP;
 }

-/*****************************************************************************/
-/* SysFS structs							     */
-/*****************************************************************************/
-
-/* Temperature sensors */
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_value, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_value, 1);
-static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_value, 2);
-static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_value, 3);
-static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_value, 4);
-static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_value, 5);
-static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_value, 6);
-static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_value, 7);
-static SENSOR_DEVICE_ATTR_RO(temp9_input, temp_value, 8);
-static SENSOR_DEVICE_ATTR_RO(temp10_input, temp_value, 9);
-static SENSOR_DEVICE_ATTR_RO(temp11_input, temp_value, 10);
-static SENSOR_DEVICE_ATTR_RO(temp12_input, temp_value, 11);
-static SENSOR_DEVICE_ATTR_RO(temp13_input, temp_value, 12);
-static SENSOR_DEVICE_ATTR_RO(temp14_input, temp_value, 13);
-static SENSOR_DEVICE_ATTR_RO(temp15_input, temp_value, 14);
-static SENSOR_DEVICE_ATTR_RO(temp16_input, temp_value, 15);
-
-static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
-static SENSOR_DEVICE_ATTR_RO(temp3_fault, temp_fault, 2);
-static SENSOR_DEVICE_ATTR_RO(temp4_fault, temp_fault, 3);
-static SENSOR_DEVICE_ATTR_RO(temp5_fault, temp_fault, 4);
-static SENSOR_DEVICE_ATTR_RO(temp6_fault, temp_fault, 5);
-static SENSOR_DEVICE_ATTR_RO(temp7_fault, temp_fault, 6);
-static SENSOR_DEVICE_ATTR_RO(temp8_fault, temp_fault, 7);
-static SENSOR_DEVICE_ATTR_RO(temp9_fault, temp_fault, 8);
-static SENSOR_DEVICE_ATTR_RO(temp10_fault, temp_fault, 9);
-static SENSOR_DEVICE_ATTR_RO(temp11_fault, temp_fault, 10);
-static SENSOR_DEVICE_ATTR_RO(temp12_fault, temp_fault, 11);
-static SENSOR_DEVICE_ATTR_RO(temp13_fault, temp_fault, 12);
-static SENSOR_DEVICE_ATTR_RO(temp14_fault, temp_fault, 13);
-static SENSOR_DEVICE_ATTR_RO(temp15_fault, temp_fault, 14);
-static SENSOR_DEVICE_ATTR_RO(temp16_fault, temp_fault, 15);
-
-static SENSOR_DEVICE_ATTR_RW(temp1_alarm, temp_alarm, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_alarm, temp_alarm, 1);
-static SENSOR_DEVICE_ATTR_RW(temp3_alarm, temp_alarm, 2);
-static SENSOR_DEVICE_ATTR_RW(temp4_alarm, temp_alarm, 3);
-static SENSOR_DEVICE_ATTR_RW(temp5_alarm, temp_alarm, 4);
-static SENSOR_DEVICE_ATTR_RW(temp6_alarm, temp_alarm, 5);
-static SENSOR_DEVICE_ATTR_RW(temp7_alarm, temp_alarm, 6);
-static SENSOR_DEVICE_ATTR_RW(temp8_alarm, temp_alarm, 7);
-static SENSOR_DEVICE_ATTR_RW(temp9_alarm, temp_alarm, 8);
-static SENSOR_DEVICE_ATTR_RW(temp10_alarm, temp_alarm, 9);
-static SENSOR_DEVICE_ATTR_RW(temp11_alarm, temp_alarm, 10);
-static SENSOR_DEVICE_ATTR_RW(temp12_alarm, temp_alarm, 11);
-static SENSOR_DEVICE_ATTR_RW(temp13_alarm, temp_alarm, 12);
-static SENSOR_DEVICE_ATTR_RW(temp14_alarm, temp_alarm, 13);
-static SENSOR_DEVICE_ATTR_RW(temp15_alarm, temp_alarm, 14);
-static SENSOR_DEVICE_ATTR_RW(temp16_alarm, temp_alarm, 15);
-
-static struct attribute *fts_temp_attrs[] = {
-	&sensor_dev_attr_temp1_input.dev_attr.attr,
-	&sensor_dev_attr_temp2_input.dev_attr.attr,
-	&sensor_dev_attr_temp3_input.dev_attr.attr,
-	&sensor_dev_attr_temp4_input.dev_attr.attr,
-	&sensor_dev_attr_temp5_input.dev_attr.attr,
-	&sensor_dev_attr_temp6_input.dev_attr.attr,
-	&sensor_dev_attr_temp7_input.dev_attr.attr,
-	&sensor_dev_attr_temp8_input.dev_attr.attr,
-	&sensor_dev_attr_temp9_input.dev_attr.attr,
-	&sensor_dev_attr_temp10_input.dev_attr.attr,
-	&sensor_dev_attr_temp11_input.dev_attr.attr,
-	&sensor_dev_attr_temp12_input.dev_attr.attr,
-	&sensor_dev_attr_temp13_input.dev_attr.attr,
-	&sensor_dev_attr_temp14_input.dev_attr.attr,
-	&sensor_dev_attr_temp15_input.dev_attr.attr,
-	&sensor_dev_attr_temp16_input.dev_attr.attr,
-
-	&sensor_dev_attr_temp1_fault.dev_attr.attr,
-	&sensor_dev_attr_temp2_fault.dev_attr.attr,
-	&sensor_dev_attr_temp3_fault.dev_attr.attr,
-	&sensor_dev_attr_temp4_fault.dev_attr.attr,
-	&sensor_dev_attr_temp5_fault.dev_attr.attr,
-	&sensor_dev_attr_temp6_fault.dev_attr.attr,
-	&sensor_dev_attr_temp7_fault.dev_attr.attr,
-	&sensor_dev_attr_temp8_fault.dev_attr.attr,
-	&sensor_dev_attr_temp9_fault.dev_attr.attr,
-	&sensor_dev_attr_temp10_fault.dev_attr.attr,
-	&sensor_dev_attr_temp11_fault.dev_attr.attr,
-	&sensor_dev_attr_temp12_fault.dev_attr.attr,
-	&sensor_dev_attr_temp13_fault.dev_attr.attr,
-	&sensor_dev_attr_temp14_fault.dev_attr.attr,
-	&sensor_dev_attr_temp15_fault.dev_attr.attr,
-	&sensor_dev_attr_temp16_fault.dev_attr.attr,
-
-	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp4_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp5_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp6_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp7_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp8_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp9_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp10_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp11_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp12_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp13_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp14_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp15_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp16_alarm.dev_attr.attr,
-	NULL
+static const struct hwmon_ops fts_ops = {
+	.is_visible = fts_is_visible,
+	.read = fts_read,
+	.write = fts_write,
 };

-/* Fans */
-static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_value, 0);
-static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_value, 1);
-static SENSOR_DEVICE_ATTR_RO(fan3_input, fan_value, 2);
-static SENSOR_DEVICE_ATTR_RO(fan4_input, fan_value, 3);
-static SENSOR_DEVICE_ATTR_RO(fan5_input, fan_value, 4);
-static SENSOR_DEVICE_ATTR_RO(fan6_input, fan_value, 5);
-static SENSOR_DEVICE_ATTR_RO(fan7_input, fan_value, 6);
-static SENSOR_DEVICE_ATTR_RO(fan8_input, fan_value, 7);
-
-static SENSOR_DEVICE_ATTR_RO(fan1_source, fan_source, 0);
-static SENSOR_DEVICE_ATTR_RO(fan2_source, fan_source, 1);
-static SENSOR_DEVICE_ATTR_RO(fan3_source, fan_source, 2);
-static SENSOR_DEVICE_ATTR_RO(fan4_source, fan_source, 3);
-static SENSOR_DEVICE_ATTR_RO(fan5_source, fan_source, 4);
-static SENSOR_DEVICE_ATTR_RO(fan6_source, fan_source, 5);
-static SENSOR_DEVICE_ATTR_RO(fan7_source, fan_source, 6);
-static SENSOR_DEVICE_ATTR_RO(fan8_source, fan_source, 7);
-
-static SENSOR_DEVICE_ATTR_RW(fan1_alarm, fan_alarm, 0);
-static SENSOR_DEVICE_ATTR_RW(fan2_alarm, fan_alarm, 1);
-static SENSOR_DEVICE_ATTR_RW(fan3_alarm, fan_alarm, 2);
-static SENSOR_DEVICE_ATTR_RW(fan4_alarm, fan_alarm, 3);
-static SENSOR_DEVICE_ATTR_RW(fan5_alarm, fan_alarm, 4);
-static SENSOR_DEVICE_ATTR_RW(fan6_alarm, fan_alarm, 5);
-static SENSOR_DEVICE_ATTR_RW(fan7_alarm, fan_alarm, 6);
-static SENSOR_DEVICE_ATTR_RW(fan8_alarm, fan_alarm, 7);
-
-static struct attribute *fts_fan_attrs[] = {
-	&sensor_dev_attr_fan1_input.dev_attr.attr,
-	&sensor_dev_attr_fan2_input.dev_attr.attr,
-	&sensor_dev_attr_fan3_input.dev_attr.attr,
-	&sensor_dev_attr_fan4_input.dev_attr.attr,
-	&sensor_dev_attr_fan5_input.dev_attr.attr,
-	&sensor_dev_attr_fan6_input.dev_attr.attr,
-	&sensor_dev_attr_fan7_input.dev_attr.attr,
-	&sensor_dev_attr_fan8_input.dev_attr.attr,
-
-	&sensor_dev_attr_fan1_source.dev_attr.attr,
-	&sensor_dev_attr_fan2_source.dev_attr.attr,
-	&sensor_dev_attr_fan3_source.dev_attr.attr,
-	&sensor_dev_attr_fan4_source.dev_attr.attr,
-	&sensor_dev_attr_fan5_source.dev_attr.attr,
-	&sensor_dev_attr_fan6_source.dev_attr.attr,
-	&sensor_dev_attr_fan7_source.dev_attr.attr,
-	&sensor_dev_attr_fan8_source.dev_attr.attr,
-
-	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan4_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan5_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan6_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan7_alarm.dev_attr.attr,
-	&sensor_dev_attr_fan8_alarm.dev_attr.attr,
+static const struct hwmon_channel_info *fts_info[] = {
+	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT
+			   ),
+	HWMON_CHANNEL_INFO(fan,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM,
+			   HWMON_F_INPUT | HWMON_F_ALARM
+			   ),
+	HWMON_CHANNEL_INFO(in,
+			   HWMON_I_INPUT,
+			   HWMON_I_INPUT,
+			   HWMON_I_INPUT,
+			   HWMON_I_INPUT
+			   ),
 	NULL
 };

-/* Voltages */
-static SENSOR_DEVICE_ATTR_RO(in1_input, in_value, 0);
-static SENSOR_DEVICE_ATTR_RO(in2_input, in_value, 1);
-static SENSOR_DEVICE_ATTR_RO(in3_input, in_value, 2);
-static SENSOR_DEVICE_ATTR_RO(in4_input, in_value, 3);
-static struct attribute *fts_voltage_attrs[] = {
-	&sensor_dev_attr_in1_input.dev_attr.attr,
-	&sensor_dev_attr_in2_input.dev_attr.attr,
-	&sensor_dev_attr_in3_input.dev_attr.attr,
-	&sensor_dev_attr_in4_input.dev_attr.attr,
-	NULL
-};
-
-static const struct attribute_group fts_voltage_attr_group = {
-	.attrs = fts_voltage_attrs
-};
-
-static const struct attribute_group fts_temp_attr_group = {
-	.attrs = fts_temp_attrs
-};
-
-static const struct attribute_group fts_fan_attr_group = {
-	.attrs = fts_fan_attrs
-};
-
-static const struct attribute_group *fts_attr_groups[] = {
-	&fts_voltage_attr_group,
-	&fts_temp_attr_group,
-	&fts_fan_attr_group,
-	NULL
+static const struct hwmon_chip_info fts_chip_info = {
+	.ops = &fts_ops,
+	.info = fts_info,
 };

 /*****************************************************************************/
@@ -793,10 +671,8 @@ static int fts_probe(struct i2c_client *client)
 		return err;
 	revision = err;

-	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
-							   "ftsteutates",
-							   data,
-							   fts_attr_groups);
+	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, "ftsteutates", data,
+							 &fts_chip_info, fts_attr_groups);
 	if (IS_ERR(hwmon_dev))
 		return PTR_ERR(hwmon_dev);

--
2.30.2

Re: [PATCH v2 1/3] hwmon: (ftsteutates) Convert to devm_hwmon_device_register_with_info()

[Guenter Roeck]

On Thu, Jan 05, 2023 at 11:51:05PM +0100, Armin Wolf wrote:
> Convert driver to use devm_hwmon_device_register_with_info()
> to reduce module size by ~30%.
> 
> Tested on a Fujitsu DS3401-B1.
> 
> Signed-off-by: Armin Wolf <W_Armin@gmx.de>

Applied to hwmon-next.

Thanks,
Guenter

[PATCH v2 2/3] hwmon: (ftsteutates) Replace fanX_source with pwmX_auto_channels_temp

[Armin Wolf]

Replace the nonstandard fanX_source attributes with the standardized
pwmX_auto_channels_temp attributes and document the special behaviour
associated with those attributes.

Tested on a Fujitsu DS3401-B1.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 Documentation/hwmon/ftsteutates.rst |  5 ++
 drivers/hwmon/ftsteutates.c         | 77 +++++++++++------------------
 2 files changed, 33 insertions(+), 49 deletions(-)

diff --git a/Documentation/hwmon/ftsteutates.rst b/Documentation/hwmon/ftsteutates.rst
index 198fa8e2819d..b3bfec36661d 100644
--- a/Documentation/hwmon/ftsteutates.rst
+++ b/Documentation/hwmon/ftsteutates.rst
@@ -22,6 +22,11 @@ enhancements. It can monitor up to 4 voltages, 16 temperatures and
 8 fans. It also contains an integrated watchdog which is currently
 implemented in this driver.

+The ``pwmX_auto_channels_temp`` attributes show which temperature sensor
+is currently driving which fan channel. This value might dynamically change
+during runtime depending on the temperature sensor selected by
+the fan control circuit.
+
 The 4 voltages require a board-specific multiplier, since the BMC can
 only measure voltages up to 3.3V and thus relies on voltage dividers.
 Consult your motherboard manual for details.
diff --git a/drivers/hwmon/ftsteutates.c b/drivers/hwmon/ftsteutates.c
index 23dc3a74f84b..0d8ab94250a9 100644
--- a/drivers/hwmon/ftsteutates.c
+++ b/drivers/hwmon/ftsteutates.c
@@ -6,9 +6,7 @@
  *		  Thilo Cestonaro <thilo.cestonaro@ts.fujitsu.com>
  */
 #include <linux/err.h>
-#include <linux/fs.h>
 #include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/jiffies.h>
@@ -16,7 +14,6 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
-#include <linux/sysfs.h>
 #include <linux/watchdog.h>

 #define FTS_DEVICE_ID_REG		0x0000
@@ -48,6 +45,8 @@
 #define FTS_NO_TEMP_SENSORS		0x10
 #define FTS_NO_VOLT_SENSORS		0x04

+#define FTS_FAN_SOURCE_INVALID		0xff
+
 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };

 static const struct i2c_device_id fts_id[] = {
@@ -187,7 +186,7 @@ static int fts_update_device(struct fts_data *data)
 			data->fan_source[i] = err;
 		} else {
 			data->fan_input[i] = 0;
-			data->fan_source[i] = 0;
+			data->fan_source[i] = FTS_FAN_SOURCE_INVALID;
 		}
 	}

@@ -339,50 +338,6 @@ static int fts_watchdog_init(struct fts_data *data)
 	return devm_watchdog_register_device(&data->client->dev, &data->wdd);
 }

-static ssize_t fan_source_show(struct device *dev,
-			       struct device_attribute *devattr, char *buf)
-{
-	struct fts_data *data = dev_get_drvdata(dev);
-	int index = to_sensor_dev_attr(devattr)->index;
-	int err;
-
-	err = fts_update_device(data);
-	if (err < 0)
-		return err;
-
-	return sprintf(buf, "%u\n", data->fan_source[index]);
-}
-
-static SENSOR_DEVICE_ATTR_RO(fan1_source, fan_source, 0);
-static SENSOR_DEVICE_ATTR_RO(fan2_source, fan_source, 1);
-static SENSOR_DEVICE_ATTR_RO(fan3_source, fan_source, 2);
-static SENSOR_DEVICE_ATTR_RO(fan4_source, fan_source, 3);
-static SENSOR_DEVICE_ATTR_RO(fan5_source, fan_source, 4);
-static SENSOR_DEVICE_ATTR_RO(fan6_source, fan_source, 5);
-static SENSOR_DEVICE_ATTR_RO(fan7_source, fan_source, 6);
-static SENSOR_DEVICE_ATTR_RO(fan8_source, fan_source, 7);
-
-static struct attribute *fts_fan_attrs[] = {
-	&sensor_dev_attr_fan1_source.dev_attr.attr,
-	&sensor_dev_attr_fan2_source.dev_attr.attr,
-	&sensor_dev_attr_fan3_source.dev_attr.attr,
-	&sensor_dev_attr_fan4_source.dev_attr.attr,
-	&sensor_dev_attr_fan5_source.dev_attr.attr,
-	&sensor_dev_attr_fan6_source.dev_attr.attr,
-	&sensor_dev_attr_fan7_source.dev_attr.attr,
-	&sensor_dev_attr_fan8_source.dev_attr.attr,
-	NULL
-};
-
-static const struct attribute_group fts_attr_group = {
-	.attrs = fts_fan_attrs
-};
-
-static const struct attribute_group *fts_attr_groups[] = {
-	&fts_attr_group,
-	NULL
-};
-
 static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type, u32 attr,
 			      int channel)
 {
@@ -408,6 +363,7 @@ static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type,
 			break;
 		}
 		break;
+	case hwmon_pwm:
 	case hwmon_in:
 		return 0444;
 	default:
@@ -460,6 +416,19 @@ static int fts_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 			break;
 		}
 		break;
+	case hwmon_pwm:
+		switch (attr) {
+		case hwmon_pwm_auto_channels_temp:
+			if (data->fan_source[channel] == FTS_FAN_SOURCE_INVALID)
+				*val = 0;
+			else
+				*val = BIT(data->fan_source[channel]);
+
+			return 0;
+		default:
+			break;
+		}
+		break;
 	case hwmon_in:
 		switch (attr) {
 		case hwmon_in_input:
@@ -576,6 +545,16 @@ static const struct hwmon_channel_info *fts_info[] = {
 			   HWMON_F_INPUT | HWMON_F_ALARM,
 			   HWMON_F_INPUT | HWMON_F_ALARM
 			   ),
+	HWMON_CHANNEL_INFO(pwm,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP
+			   ),
 	HWMON_CHANNEL_INFO(in,
 			   HWMON_I_INPUT,
 			   HWMON_I_INPUT,
@@ -672,7 +651,7 @@ static int fts_probe(struct i2c_client *client)
 	revision = err;

 	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, "ftsteutates", data,
-							 &fts_chip_info, fts_attr_groups);
+							 &fts_chip_info, NULL);
 	if (IS_ERR(hwmon_dev))
 		return PTR_ERR(hwmon_dev);

--
2.30.2

Re: [PATCH v2 2/3] hwmon: (ftsteutates) Replace fanX_source with pwmX_auto_channels_temp

[Guenter Roeck]

On Thu, Jan 05, 2023 at 11:51:06PM +0100, Armin Wolf wrote:
> Replace the nonstandard fanX_source attributes with the standardized
> pwmX_auto_channels_temp attributes and document the special behaviour
> associated with those attributes.
> 
> Tested on a Fujitsu DS3401-B1.
> 
> Signed-off-by: Armin Wolf <W_Armin@gmx.de>

Applied to hwmon-next.

Thanks,
Guenter

> ---
>  Documentation/hwmon/ftsteutates.rst |  5 ++
>  drivers/hwmon/ftsteutates.c         | 77 +++++++++++------------------
>  2 files changed, 33 insertions(+), 49 deletions(-)
> 
> --
> 2.30.2
> 
> diff --git a/Documentation/hwmon/ftsteutates.rst b/Documentation/hwmon/ftsteutates.rst
> index 198fa8e2819d..b3bfec36661d 100644
> --- a/Documentation/hwmon/ftsteutates.rst
> +++ b/Documentation/hwmon/ftsteutates.rst
> @@ -22,6 +22,11 @@ enhancements. It can monitor up to 4 voltages, 16 temperatures and
>  8 fans. It also contains an integrated watchdog which is currently
>  implemented in this driver.
> 
> +The ``pwmX_auto_channels_temp`` attributes show which temperature sensor
> +is currently driving which fan channel. This value might dynamically change
> +during runtime depending on the temperature sensor selected by
> +the fan control circuit.
> +
>  The 4 voltages require a board-specific multiplier, since the BMC can
>  only measure voltages up to 3.3V and thus relies on voltage dividers.
>  Consult your motherboard manual for details.
> diff --git a/drivers/hwmon/ftsteutates.c b/drivers/hwmon/ftsteutates.c
> index 23dc3a74f84b..0d8ab94250a9 100644
> --- a/drivers/hwmon/ftsteutates.c
> +++ b/drivers/hwmon/ftsteutates.c
> @@ -6,9 +6,7 @@
>   *		  Thilo Cestonaro <thilo.cestonaro@ts.fujitsu.com>
>   */
>  #include <linux/err.h>
> -#include <linux/fs.h>
>  #include <linux/hwmon.h>
> -#include <linux/hwmon-sysfs.h>
>  #include <linux/i2c.h>
>  #include <linux/init.h>
>  #include <linux/jiffies.h>
> @@ -16,7 +14,6 @@
>  #include <linux/module.h>
>  #include <linux/mutex.h>
>  #include <linux/slab.h>
> -#include <linux/sysfs.h>
>  #include <linux/watchdog.h>
> 
>  #define FTS_DEVICE_ID_REG		0x0000
> @@ -48,6 +45,8 @@
>  #define FTS_NO_TEMP_SENSORS		0x10
>  #define FTS_NO_VOLT_SENSORS		0x04
> 
> +#define FTS_FAN_SOURCE_INVALID		0xff
> +
>  static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
> 
>  static const struct i2c_device_id fts_id[] = {
> @@ -187,7 +186,7 @@ static int fts_update_device(struct fts_data *data)
>  			data->fan_source[i] = err;
>  		} else {
>  			data->fan_input[i] = 0;
> -			data->fan_source[i] = 0;
> +			data->fan_source[i] = FTS_FAN_SOURCE_INVALID;
>  		}
>  	}
> 
> @@ -339,50 +338,6 @@ static int fts_watchdog_init(struct fts_data *data)
>  	return devm_watchdog_register_device(&data->client->dev, &data->wdd);
>  }
> 
> -static ssize_t fan_source_show(struct device *dev,
> -			       struct device_attribute *devattr, char *buf)
> -{
> -	struct fts_data *data = dev_get_drvdata(dev);
> -	int index = to_sensor_dev_attr(devattr)->index;
> -	int err;
> -
> -	err = fts_update_device(data);
> -	if (err < 0)
> -		return err;
> -
> -	return sprintf(buf, "%u\n", data->fan_source[index]);
> -}
> -
> -static SENSOR_DEVICE_ATTR_RO(fan1_source, fan_source, 0);
> -static SENSOR_DEVICE_ATTR_RO(fan2_source, fan_source, 1);
> -static SENSOR_DEVICE_ATTR_RO(fan3_source, fan_source, 2);
> -static SENSOR_DEVICE_ATTR_RO(fan4_source, fan_source, 3);
> -static SENSOR_DEVICE_ATTR_RO(fan5_source, fan_source, 4);
> -static SENSOR_DEVICE_ATTR_RO(fan6_source, fan_source, 5);
> -static SENSOR_DEVICE_ATTR_RO(fan7_source, fan_source, 6);
> -static SENSOR_DEVICE_ATTR_RO(fan8_source, fan_source, 7);
> -
> -static struct attribute *fts_fan_attrs[] = {
> -	&sensor_dev_attr_fan1_source.dev_attr.attr,
> -	&sensor_dev_attr_fan2_source.dev_attr.attr,
> -	&sensor_dev_attr_fan3_source.dev_attr.attr,
> -	&sensor_dev_attr_fan4_source.dev_attr.attr,
> -	&sensor_dev_attr_fan5_source.dev_attr.attr,
> -	&sensor_dev_attr_fan6_source.dev_attr.attr,
> -	&sensor_dev_attr_fan7_source.dev_attr.attr,
> -	&sensor_dev_attr_fan8_source.dev_attr.attr,
> -	NULL
> -};
> -
> -static const struct attribute_group fts_attr_group = {
> -	.attrs = fts_fan_attrs
> -};
> -
> -static const struct attribute_group *fts_attr_groups[] = {
> -	&fts_attr_group,
> -	NULL
> -};
> -
>  static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type, u32 attr,
>  			      int channel)
>  {
> @@ -408,6 +363,7 @@ static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type,
>  			break;
>  		}
>  		break;
> +	case hwmon_pwm:
>  	case hwmon_in:
>  		return 0444;
>  	default:
> @@ -460,6 +416,19 @@ static int fts_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
>  			break;
>  		}
>  		break;
> +	case hwmon_pwm:
> +		switch (attr) {
> +		case hwmon_pwm_auto_channels_temp:
> +			if (data->fan_source[channel] == FTS_FAN_SOURCE_INVALID)
> +				*val = 0;
> +			else
> +				*val = BIT(data->fan_source[channel]);
> +
> +			return 0;
> +		default:
> +			break;
> +		}
> +		break;
>  	case hwmon_in:
>  		switch (attr) {
>  		case hwmon_in_input:
> @@ -576,6 +545,16 @@ static const struct hwmon_channel_info *fts_info[] = {
>  			   HWMON_F_INPUT | HWMON_F_ALARM,
>  			   HWMON_F_INPUT | HWMON_F_ALARM
>  			   ),
> +	HWMON_CHANNEL_INFO(pwm,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP
> +			   ),
>  	HWMON_CHANNEL_INFO(in,
>  			   HWMON_I_INPUT,
>  			   HWMON_I_INPUT,
> @@ -672,7 +651,7 @@ static int fts_probe(struct i2c_client *client)
>  	revision = err;
> 
>  	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, "ftsteutates", data,
> -							 &fts_chip_info, fts_attr_groups);
> +							 &fts_chip_info, NULL);
>  	if (IS_ERR(hwmon_dev))
>  		return PTR_ERR(hwmon_dev);

[PATCH v2 3/3] hwmon: (ftsteutates) Add support for fanX_fault attributes

[Armin Wolf]

The driver knows internally when a fan is not connected,
but does not export this knowledge to userspace. Use the
standard fanX_fault attributes to notify userspace if a
fan is not connected.

Tested on a Fujitsu DS3401-B1.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/hwmon/ftsteutates.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/hwmon/ftsteutates.c b/drivers/hwmon/ftsteutates.c
index 0d8ab94250a9..25afd9167a34 100644
--- a/drivers/hwmon/ftsteutates.c
+++ b/drivers/hwmon/ftsteutates.c
@@ -356,6 +356,7 @@ static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type,
 	case hwmon_fan:
 		switch (attr) {
 		case hwmon_fan_input:
+		case hwmon_fan_fault:
 			return 0444;
 		case hwmon_fan_alarm:
 			return 0644;
@@ -411,6 +412,10 @@ static int fts_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 		case hwmon_fan_alarm:
 			*val = !!(data->fan_alarm & BIT(channel));

+			return 0;
+		case hwmon_fan_fault:
+			*val = !(data->fan_present & BIT(channel));
+
 			return 0;
 		default:
 			break;
@@ -536,14 +541,14 @@ static const struct hwmon_channel_info *fts_info[] = {
 			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT
 			   ),
 	HWMON_CHANNEL_INFO(fan,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM,
-			   HWMON_F_INPUT | HWMON_F_ALARM
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
+			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT
 			   ),
 	HWMON_CHANNEL_INFO(pwm,
 			   HWMON_PWM_AUTO_CHANNELS_TEMP,
--
2.30.2

Re: [PATCH v2 3/3] hwmon: (ftsteutates) Add support for fanX_fault attributes

[Guenter Roeck]

On Thu, Jan 05, 2023 at 11:51:07PM +0100, Armin Wolf wrote:
> The driver knows internally when a fan is not connected,
> but does not export this knowledge to userspace. Use the
> standard fanX_fault attributes to notify userspace if a
> fan is not connected.
> 
> Tested on a Fujitsu DS3401-B1.
> 
> Signed-off-by: Armin Wolf <W_Armin@gmx.de>

Applied to hwmon-next.

Thanks,
Guenter