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iio: inkern: add iio_read_channel_offset helper 

Allow access to underlying channel IIO_CHAN_INFO_OFFSET from a consumer.

Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Matt Ranostay 2016-09-23 23:04:07 -07:00 committed by Jonathan Cameron
parent 2a20af722d
commit 0023e67dd8
2 changed files with 39 additions and 13 deletions
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39
drivers/iio/inkern.c
View File

@ -658,6 +658,31 @@ err_unlock:
}
EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);
static int iio_read_channel_attribute(struct iio_channel *chan,
int *val, int *val2,
enum iio_chan_info_enum attribute)
{
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, val2, attribute);
err_unlock:
mutex_unlock(&chan->indio_dev->info_exist_lock);
return ret;
}
int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2)
{
return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_OFFSET);
}
EXPORT_SYMBOL_GPL(iio_read_channel_offset);
int iio_read_channel_processed(struct iio_channel *chan, int *val)
{
int ret;
@ -687,19 +712,7 @@ EXPORT_SYMBOL_GPL(iio_read_channel_processed);
int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
{
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, val2, IIO_CHAN_INFO_SCALE);
err_unlock:
mutex_unlock(&chan->indio_dev->info_exist_lock);
return ret;
return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_SCALE);
}
EXPORT_SYMBOL_GPL(iio_read_channel_scale);

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

@ -235,6 +235,19 @@ int iio_write_channel_raw(struct iio_channel *chan, int val);
int iio_get_channel_type(struct iio_channel *channel,
enum iio_chan_type *type);
/**
* iio_read_channel_offset() - read the offset value for a channel
* @chan: The channel being queried.
* @val: First part of value read back.
* @val2: Second part of value read back.
*
* Note returns a description of what is in val and val2, such
* as IIO_VAL_INT_PLUS_MICRO telling us we have a value of val
* + val2/1e6
*/
int iio_read_channel_offset(struct iio_channel *chan, int *val,
int *val2);
/**
* iio_read_channel_scale() - read the scale value for a channel
* @chan: The channel being queried.