This allows the iio consumer to get the offset of the channel.
The value of offset can be used when calculating the result such
as 'result = raw * scale + offset'.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@xxxxxx>
---
drivers/iio/inkern.c | 21 +++++++++++++++++++++
include/linux/iio/consumer.h | 9 +++++++++
2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index b5afc2f..bd09245 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -269,6 +269,27 @@ err_unlock:
}
EXPORT_SYMBOL_GPL(iio_read_channel_scale);
+int iio_read_channel_offset(struct iio_channel *chan, int *val)
+{
+ int val2, ret;
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (chan->indio_dev->info == NULL) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = chan->indio_dev->info->read_raw(chan->indio_dev,
+ chan->channel,
+ val, &val2,
+ IIO_CHAN_INFO_OFFSET);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_read_channel_offset);
+
int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type)
{
int ret = 0;
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index e2657e6..d9d69fa 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -93,4 +93,13 @@ int iio_get_channel_type(struct iio_channel *channel,
int iio_read_channel_scale(struct iio_channel *chan, int *val,
int *val2);
+/**
+ * iio_read_channel_offset() - read offset from a given channel
+ * @channel: The channel being queried.
+ * @val: Offset Value read back.
+ *
+ * Note offset can be used in the consumer when calculating the result
+ * such as 'result = raw * scale + offset'.
+ */
+int iio_read_channel_offset(struct iio_channel *chan, int *val);
#endif
--
1.7.2.5
Best Regards,
Milo
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