101 lines
3.0 KiB
Diff
101 lines
3.0 KiB
Diff
From c546d49656143855093c7b7fde60866e6e23a69d Mon Sep 17 00:00:00 2001
|
|
From: Tomasz Duszynski <tduszyns@gmail.com>
|
|
Date: Tue, 18 Dec 2018 21:28:09 +0100
|
|
Subject: [PATCH] iio: chemical: sps30: add support for self cleaning
|
|
|
|
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>
|
|
---
|
|
Documentation/ABI/testing/sysfs-bus-iio-sps30 | 8 +++++
|
|
drivers/iio/chemical/sps30.c | 35 ++++++++++++++++++-
|
|
2 files changed, 42 insertions(+), 1 deletion(-)
|
|
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-sps30
|
|
|
|
--- /dev/null
|
|
+++ b/Documentation/ABI/testing/sysfs-bus-iio-sps30
|
|
@@ -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.
|
|
--- a/drivers/iio/chemical/sps30.c
|
|
+++ b/drivers/iio/chemical/sps30.c
|
|
@@ -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_sta
|
|
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
|
|
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,
|
|
};
|
|
|