Le 23/06/2023 à 10:58, Herve Codina a écrit :
The raw values notes mention 'ADC counts' and are not fully accurate.
Reword the notes in order to remove the 'ADC counts' and describe the conversion needed between a raw value and a value in the standard units.
Signed-off-by: Herve Codina herve.codina@bootlin.com Acked-by: Jonathan Cameron Jonathan.Cameron@huawei.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com
Reviewed-by: Christophe Leroy christophe.leroy@csgroup.eu
include/linux/iio/consumer.h | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 6802596b017c..f536820b9cf2 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -201,8 +201,9 @@ struct iio_dev
- @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.
- Note, if standard units are required, raw reads from iio channels
- need the offset (default 0) and scale (default 1) to be applied
*/ int iio_read_channel_raw(struct iio_channel *chan, int *val);
- as (raw + offset) * scale.
@@ -212,8 +213,9 @@ int iio_read_channel_raw(struct iio_channel *chan,
- @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.
- Note, if standard units are required, raw reads from iio channels
- need the offset (default 0) and scale (default 1) to be applied
- as (raw + offset) * scale.
- In opposit to the normal iio_read_channel_raw this function
- returns the average of multiple reads.
@@ -281,8 +283,9 @@ int iio_read_channel_attribute(struct iio_channel *chan, int *val,
- @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.
- Note that for raw writes to iio channels, if the value provided is
- in standard units, the affect of the scale and offset must be removed
*/ int iio_write_channel_raw(struct iio_channel *chan, int val);
- as (value / scale) - offset.
@@ -292,8 +295,9 @@ int iio_write_channel_raw(struct iio_channel *chan, int val);
- @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 are required.
- Note, if standard units are required, raw reads from iio channels
- need the offset (default 0) and scale (default 1) to be applied
*/ int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
- as (raw + offset) * scale.
@@ -308,8 +312,9 @@ int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
- For ranges, three vals are always returned; min, step and max.
- For lists, all the possible values are enumerated.
- Note raw available values from iio channels are in adc counts and
- hence scale will need to be applied if standard units are required.
- Note, if standard units are required, raw available values from iio
- channels need the offset (default 0) and scale (default 1) to be applied
*/ int iio_read_avail_channel_raw(struct iio_channel *chan, const int **vals, int *length);
- as (raw + offset) * scale.