diff mbox series

[v3,04/12] iio: consumer.h: Fix raw values documentation notes

Message ID 20230612122926.107333-5-herve.codina@bootlin.com
State New
Headers
Series Add support for IIO devices in ASoC |

Commit Message

Herve Codina June 12, 2023, 12:29 p.m. UTC 
  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>
---
 include/linux/iio/consumer.h | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

Comments

Andy Shevchenko June 12, 2023, 2:16 p.m. UTC | #1 
On Mon, Jun 12, 2023 at 3:30 PM Herve Codina <herve.codina@bootlin.com> wrote:
>
> 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.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> Signed-off-by: Herve Codina <herve.codina@bootlin.com>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
>  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
> + * as (raw + offset) * scale.
>   */
>  int iio_read_channel_raw(struct iio_channel *chan,
>                          int *val);
> @@ -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
> + * as (value / scale) - offset.
>   */
>  int iio_write_channel_raw(struct iio_channel *chan, int val);
>
> @@ -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
> + * as (raw + offset) * scale.
>   */
>  int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
>
> @@ -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
> + * as (raw + offset) * scale.
>   */
>  int iio_read_avail_channel_raw(struct iio_channel *chan,
>                                const int **vals, int *length);
> --
> 2.40.1
>
diff mbox series

Patch

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
+ * as (raw + offset) * scale.
  */
 int iio_read_channel_raw(struct iio_channel *chan,
 			 int *val);
@@ -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
+ * as (value / scale) - offset.
  */
 int iio_write_channel_raw(struct iio_channel *chan, int val);
 
@@ -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
+ * as (raw + offset) * scale.
  */
 int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
 
@@ -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
+ * as (raw + offset) * scale.
  */
 int iio_read_avail_channel_raw(struct iio_channel *chan,
 			       const int **vals, int *length);