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hwmon: (sht3x) Add new non-stardard sysfs attribute
Add "repeatability" attribute to sysfs, it could be read or written to control the sensor. Signed-off-by: JuenKit Yip <JuenKit_Yip@hotmail.com> Link: https://lore.kernel.org/r/DB4PR10MB6261B507C7656E3568DA33E39258A@DB4PR10MB6261.EURPRD10.PROD.OUTLOOK.COM [groeck: Fixed multi-line alignment; dropped check of unsigned against < 0] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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3d2c211c0d
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2 changed files with 40 additions and 5 deletions
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@ -28,11 +28,6 @@ The device communicates with the I2C protocol. Sensors can have the I2C
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addresses 0x44 or 0x45, depending on the wiring. See
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Documentation/i2c/instantiating-devices.rst for methods to instantiate the device.
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There is only one option configurable by means of sht3x_data:
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repeatability: high repeatability is used by default and using it is
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strongly recommended.
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Even if sht3x sensor supports clock-strech(blocking mode) and non-strench
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(non-blocking mode) in single-shot mode, this driver only supports the latter.
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@ -83,4 +78,11 @@ heater_enable: heater enable, heating element removes excess humidity from
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update_interval: update interval, 0 for single shot, interval in msec
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for periodic measurement. If the interval is not supported
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by the sensor, the next faster interval is chosen
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repeatability: write or read repeatability, higher repeatability means
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longer measurement duration, lower noise level and
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larger energy consumption:
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- 0: low repeatability
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- 1: medium repeatability
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- 2: high repeatability
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=================== ============================================================
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@ -637,6 +637,37 @@ static ssize_t update_interval_store(struct device *dev,
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return count;
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}
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static ssize_t repeatability_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sht3x_data *data = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%d\n", data->repeatability);
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}
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static ssize_t repeatability_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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int ret;
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u8 val;
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struct sht3x_data *data = dev_get_drvdata(dev);
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ret = kstrtou8(buf, 0, &val);
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if (ret)
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return ret;
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if (val > 2)
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return -EINVAL;
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data->repeatability = val;
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return count;
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp1_input, 0);
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static SENSOR_DEVICE_ATTR_RO(humidity1_input, humidity1_input, 0);
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp1_limit, limit_max);
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@ -653,6 +684,7 @@ static SENSOR_DEVICE_ATTR_RO(temp1_alarm, temp1_alarm, 0);
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static SENSOR_DEVICE_ATTR_RO(humidity1_alarm, humidity1_alarm, 0);
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static SENSOR_DEVICE_ATTR_RW(heater_enable, heater_enable, 0);
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static SENSOR_DEVICE_ATTR_RW(update_interval, update_interval, 0);
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static SENSOR_DEVICE_ATTR_RW(repeatability, repeatability, 0);
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static struct attribute *sht3x_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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@ -669,6 +701,7 @@ static struct attribute *sht3x_attrs[] = {
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&sensor_dev_attr_humidity1_alarm.dev_attr.attr,
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&sensor_dev_attr_heater_enable.dev_attr.attr,
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&sensor_dev_attr_update_interval.dev_attr.attr,
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&sensor_dev_attr_repeatability.dev_attr.attr,
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NULL
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};
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