Introduce API for easy in-kernel setting of DAC values.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
---
drivers/iio/inkern.c | 29 +++++++++++++++++++++++++++++
include/linux/iio/consumer.h | 11 +++++++++++
2 files changed, 40 insertions(+)
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f084610..5b03e69 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -608,3 +608,32 @@ err_unlock:
return ret;
}
EXPORT_SYMBOL_GPL(iio_get_channel_type);
+
+static int iio_channel_write(struct iio_channel *chan, int val, int val2,
+ enum iio_chan_info_enum info)
+{
+ int ret;
+
+ ret = chan->indio_dev->info->write_raw(chan->indio_dev,
+ chan->channel, val, val2, info);
+
+ return ret;
+}
+
+int iio_write_channel_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_write(chan, val, 0, IIO_CHAN_INFO_RAW);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_write_channel_raw);
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index 651f9a0..06f4688 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -151,6 +151,17 @@ int iio_read_channel_average_raw(struct iio_channel *chan, int *val);
int iio_read_channel_processed(struct iio_channel *chan, int *val);
/**
+ * iio_write_channel_raw() - write to a given channel
+ * @chan: The channel being queried.
+ * @val: Value being written.
+ *
+ * Note raw writes to iio channels are in dac counts and hence
+ * scale will need to be applied if standard units required.
+ */
+int iio_write_channel_raw(struct iio_channel *chan,
+ int val);
+
+/**
* iio_get_channel_type() - get the type of a channel
* @channel: The channel being queried.
* @type: The type of the channel.
--
2.1.3
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