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hwmon: (sht3x) Add new non-stardard sysfs attribute

Browse source 
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>
This commit is contained in:
JuenKit Yip 2023-06-17 00:00:16 +08:00 committed by Guenter Roeck
parent 3d2c211c0d
commit af5ab55012
2 changed files with 40 additions and 5 deletions
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12
Documentation/hwmon/sht3x.rst
View file

@ -28,11 +28,6 @@ The device communicates with the I2C protocol. Sensors can have the I2C
addresses 0x44 or 0x45, depending on the wiring. See
Documentation/i2c/instantiating-devices.rst for methods to instantiate the device.
There is only one option configurable by means of sht3x_data:
repeatability: high repeatability is used by default and using it is
strongly recommended.
Even if sht3x sensor supports clock-strech(blocking mode) and non-strench
(non-blocking mode) in single-shot mode, this driver only supports the latter.
@ -83,4 +78,11 @@ heater_enable: heater enable, heating element removes excess humidity from
update_interval: update interval, 0 for single shot, interval in msec
for periodic measurement. If the interval is not supported
by the sensor, the next faster interval is chosen
repeatability: write or read repeatability, higher repeatability means
longer measurement duration, lower noise level and
larger energy consumption:
- 0: low repeatability
- 1: medium repeatability
- 2: high repeatability
=================== ============================================================

33
drivers/hwmon/sht3x.c
View file

@ -637,6 +637,37 @@ static ssize_t update_interval_store(struct device *dev,
return count;
}
static ssize_t repeatability_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sht3x_data *data = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n", data->repeatability);
}
static ssize_t repeatability_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
int ret;
u8 val;
struct sht3x_data *data = dev_get_drvdata(dev);
ret = kstrtou8(buf, 0, &val);
if (ret)
return ret;
if (val > 2)
return -EINVAL;
data->repeatability = val;
return count;
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp1_input, 0);
static SENSOR_DEVICE_ATTR_RO(humidity1_input, humidity1_input, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp1_limit, limit_max);
@ -653,6 +684,7 @@ static SENSOR_DEVICE_ATTR_RO(temp1_alarm, temp1_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(humidity1_alarm, humidity1_alarm, 0);
static SENSOR_DEVICE_ATTR_RW(heater_enable, heater_enable, 0);
static SENSOR_DEVICE_ATTR_RW(update_interval, update_interval, 0);
static SENSOR_DEVICE_ATTR_RW(repeatability, repeatability, 0);
static struct attribute *sht3x_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
@ -669,6 +701,7 @@ static struct attribute *sht3x_attrs[] = {
&sensor_dev_attr_humidity1_alarm.dev_attr.attr,
&sensor_dev_attr_heater_enable.dev_attr.attr,
&sensor_dev_attr_update_interval.dev_attr.attr,
&sensor_dev_attr_repeatability.dev_attr.attr,
NULL
};