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Subject[PATCHv1 9/9] iio: inkern: add iio_read_channel_average_raw
Date
Add iio_read_channel_average_raw to support reading
averaged raw values in consumer drivers.

Signed-off-by: Sebastian Reichel <sre@debian.org>
---
drivers/iio/inkern.c | 18 ++++++++++++++++++
include/linux/iio/consumer.h | 13 +++++++++++++
2 files changed, 31 insertions(+)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 0cf5f8e..adeba5a 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -443,6 +443,24 @@ err_unlock:
}
EXPORT_SYMBOL_GPL(iio_read_channel_raw);

+int iio_read_channel_average_raw(struct iio_channel *chan, int *val)
+{
+ int ret;
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (chan->indio_dev->info == NULL) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_read_channel_average_raw);
+
static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
int raw, int *processed, unsigned int scale)
{
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index 2752b1f..651f9a0 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -123,6 +123,19 @@ int iio_read_channel_raw(struct iio_channel *chan,
int *val);

/**
+ * iio_read_channel_average_raw() - read from a given channel
+ * @chan: The channel being queried.
+ * @val: Value read back.
+ *
+ * Note raw reads from iio channels are in adc counts and hence
+ * scale will need to be applied if standard units required.
+ *
+ * In opposit to the normal iio_read_channel_raw this function
+ * returns the average of multiple reads.
+ */
+int iio_read_channel_average_raw(struct iio_channel *chan, int *val);
+
+/**
* iio_read_channel_processed() - read processed value from a given channel
* @chan: The channel being queried.
* @val: Value read back.
--
1.9.0


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