comment below p.
> 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 <[email protected]> > --- > 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. the parameter is 'chan', not 'channel' > + * @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 > -- Peter Meerwald +43-664-2444418 (mobile) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
