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e64564920a
Refreshed all patches. Compile-tested on: cns3xxx Runtime-tested on: cns3xxx Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
101 lines
3.0 KiB
Diff
101 lines
3.0 KiB
Diff
From c546d49656143855093c7b7fde60866e6e23a69d Mon Sep 17 00:00:00 2001
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From: Tomasz Duszynski <tduszyns@gmail.com>
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Date: Tue, 18 Dec 2018 21:28:09 +0100
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Subject: [PATCH] iio: chemical: sps30: add support for self cleaning
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Self cleaning is especially useful in cases where sensor undergoes
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frequent power on/off cycles. In such scenarios it is recommended to
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turn self cleaning at least once per week in order to maintain reliable
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measurements.
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Self cleaning is activated by writing 1 to a dedicated attribute.
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Internal fan accelerates to its maximum speed and keeps spinning
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for about 10 seconds blowing out accumulated dust.
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Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
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Tested-by: Andreas Brauchli <andreas.brauchli@sensirion.com>
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Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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---
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Documentation/ABI/testing/sysfs-bus-iio-sps30 | 8 +++++
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drivers/iio/chemical/sps30.c | 35 ++++++++++++++++++-
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2 files changed, 42 insertions(+), 1 deletion(-)
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create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-sps30
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--- /dev/null
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+++ b/Documentation/ABI/testing/sysfs-bus-iio-sps30
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@@ -0,0 +1,8 @@
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+What: /sys/bus/iio/devices/iio:deviceX/start_cleaning
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+Date: December 2018
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+KernelVersion: 4.22
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+Contact: linux-iio@vger.kernel.org
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+Description:
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+ Writing 1 starts sensor self cleaning. Internal fan accelerates
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+ to its maximum speed and keeps spinning for about 10 seconds in
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+ order to blow out accumulated dust.
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--- a/drivers/iio/chemical/sps30.c
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+++ b/drivers/iio/chemical/sps30.c
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@@ -7,7 +7,6 @@
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* I2C slave address: 0x69
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*
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* TODO:
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- * - support for turning on fan cleaning
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* - support for reading/setting auto cleaning interval
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*/
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@@ -37,6 +36,7 @@
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#define SPS30_READ_DATA_READY_FLAG 0x0202
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#define SPS30_READ_DATA 0x0300
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#define SPS30_READ_SERIAL 0xd033
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+#define SPS30_START_FAN_CLEANING 0x5607
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enum {
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PM1,
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@@ -104,6 +104,7 @@ static int sps30_do_cmd(struct sps30_sta
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break;
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case SPS30_STOP_MEAS:
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case SPS30_RESET:
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+ case SPS30_START_FAN_CLEANING:
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ret = sps30_write_then_read(state, buf, 2, NULL, 0);
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break;
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case SPS30_READ_DATA_READY_FLAG:
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@@ -275,7 +276,39 @@ static int sps30_read_raw(struct iio_dev
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return -EINVAL;
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}
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+static ssize_t start_cleaning_store(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t len)
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+{
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+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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+ struct sps30_state *state = iio_priv(indio_dev);
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+ int val, ret;
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+
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+ if (kstrtoint(buf, 0, &val) || val != 1)
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+ return -EINVAL;
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+
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+ mutex_lock(&state->lock);
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+ ret = sps30_do_cmd(state, SPS30_START_FAN_CLEANING, NULL, 0);
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+ mutex_unlock(&state->lock);
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+ if (ret)
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+ return ret;
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+
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+ return len;
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+}
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+
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+static IIO_DEVICE_ATTR_WO(start_cleaning, 0);
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+
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+static struct attribute *sps30_attrs[] = {
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+ &iio_dev_attr_start_cleaning.dev_attr.attr,
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+ NULL
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+};
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+
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+static const struct attribute_group sps30_attr_group = {
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+ .attrs = sps30_attrs,
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+};
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+
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static const struct iio_info sps30_info = {
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+ .attrs = &sps30_attr_group,
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.read_raw = sps30_read_raw,
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};
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