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iio: chemical: sps30: add support for self cleaning

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Self cleaning is especially useful in cases where sensor undergoes
frequent power on/off cycles. In such scenarios it is recommended to
turn self cleaning at least once per week in order to maintain reliable
measurements.

Self cleaning is activated by writing 1 to a dedicated attribute.
Internal fan accelerates to its maximum speed and keeps spinning
for about 10 seconds blowing out accumulated dust.

Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
Tested-by: Andreas Brauchli <andreas.brauchli@sensirion.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Tomasz Duszynski 2018-12-18 21:28:09 +01:00 committed by Jonathan Cameron
parent 6a4b8937a3
commit c546d49656
2 changed files with 42 additions and 1 deletions
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8
Documentation/ABI/testing/sysfs-bus-iio-sps30 Normal file
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@ -0,0 +1,8 @@
What: /sys/bus/iio/devices/iio:deviceX/start_cleaning
Date: December 2018
KernelVersion: 4.22
Contact: linux-iio@vger.kernel.org
Description:
Writing 1 starts sensor self cleaning. Internal fan accelerates
to its maximum speed and keeps spinning for about 10 seconds in
order to blow out accumulated dust.

35
drivers/iio/chemical/sps30.c
View File

@ -7,7 +7,6 @@
* I2C slave address: 0x69
*
* TODO:
* - support for turning on fan cleaning
* - support for reading/setting auto cleaning interval
*/
@ -37,6 +36,7 @@
#define SPS30_READ_DATA_READY_FLAG 0x0202
#define SPS30_READ_DATA 0x0300
#define SPS30_READ_SERIAL 0xd033
#define SPS30_START_FAN_CLEANING 0x5607
enum {
PM1,
@ -104,6 +104,7 @@ static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
break;
case SPS30_STOP_MEAS:
case SPS30_RESET:
case SPS30_START_FAN_CLEANING:
ret = sps30_write_then_read(state, buf, 2, NULL, 0);
break;
case SPS30_READ_DATA_READY_FLAG:
@ -275,7 +276,39 @@ static int sps30_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
static ssize_t start_cleaning_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct sps30_state *state = iio_priv(indio_dev);
int val, ret;
if (kstrtoint(buf, 0, &val) || val != 1)
return -EINVAL;
mutex_lock(&state->lock);
ret = sps30_do_cmd(state, SPS30_START_FAN_CLEANING, NULL, 0);
mutex_unlock(&state->lock);
if (ret)
return ret;
return len;
}
static IIO_DEVICE_ATTR_WO(start_cleaning, 0);
static struct attribute *sps30_attrs[] = {
&iio_dev_attr_start_cleaning.dev_attr.attr,
NULL
};
static const struct attribute_group sps30_attr_group = {
.attrs = sps30_attrs,
};
static const struct iio_info sps30_info = {
.attrs = &sps30_attr_group,
.read_raw = sps30_read_raw,
};