iio: chemical: sps30: add support for self cleaning (c546d496) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-iio-sps30

0 → 100644

+8 −0

Original line number	Diff line number	Diff line
		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.

+34 −1

Original line number	Diff line number	Diff line
		@@ -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,
		};