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iio: inkern: add iio_read_channel_average_raw 

Add iio_read_channel_average_raw to support reading
averaged raw values in consumer drivers.

Signed-off-by: Sebastian Reichel <sre@debian.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Sebastian Reichel 2014-10-03 17:25:00 +01:00 committed by Jonathan Cameron
parent c0a6b7ee94
commit 476d4af22c
2 changed files with 31 additions and 0 deletions
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18
drivers/iio/inkern.c
View File

@ -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)
{

13
include/linux/iio/consumer.h
View File

@ -122,6 +122,19 @@ struct iio_channel
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.