diff options
Diffstat (limited to 'target/linux/generic/backport-4.19/501-v5.1-iio-chemical-sps30-add-support-for-self-cleaning.patch')
| -rw-r--r-- | target/linux/generic/backport-4.19/501-v5.1-iio-chemical-sps30-add-support-for-self-cleaning.patch | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.19/501-v5.1-iio-chemical-sps30-add-support-for-self-cleaning.patch b/target/linux/generic/backport-4.19/501-v5.1-iio-chemical-sps30-add-support-for-self-cleaning.patch new file mode 100644 index 0000000000..9e4b9c2d43 --- /dev/null +++ b/target/linux/generic/backport-4.19/501-v5.1-iio-chemical-sps30-add-support-for-self-cleaning.patch @@ -0,0 +1,105 @@ +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 + +diff --git a/Documentation/ABI/testing/sysfs-bus-iio-sps30 b/Documentation/ABI/testing/sysfs-bus-iio-sps30 +new file mode 100644 +index 000000000000..e7ce2c57635e +--- /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. +diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c +index fa3cd409b90b..f3b4390c8f5c 100644 +--- 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_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, + }; + |