[0/4] iio: adc: mcp3422 improvements

Message

Mitja Špes Nov. 11, 2022, 11:26 a.m. UTC

Fixes:
* iio: adc: mcp3422: fix scale read bug
  Scale was always returned for the last read input instead of the specified
  channel.

Improvements:
* iio: adc: mcp3422: allow setting gain and sampling per channel
  Sampling was the same for all channels. This patch adds the ability to select
  different gain and sampling per channel. They can be set together via scale
  attribute.
  Sampling can be set also via the standalone attribute which is now per
  channel. This might be a breaking change for some.

* iio: adc: mcp3422: add hardware gain attribute
  Setting via scale is cumbersome. This patch just adds a concise way to set
  the gain, since sampling can already be set separately.

* iio: adc: mcp3422: reduce sleep for fast sampling rates
  msleep can produce a delay which is fi. 30ms off the mark. This patch uses
  usleep_range for the higher sampling rates.

Mitja Spes (4):
  iio: adc: mcp3422: fix scale read bug
  iio: adc: mcp3422: allow setting gain and sampling per channel
  iio: adc: mcp3422: add hardware gain attribute
  iio: adc: mcp3422: reduce sleep for fast sampling rates

 drivers/iio/adc/mcp3422.c | 161 ++++++++++++++++++++++++--------------
 1 file changed, 103 insertions(+), 58 deletions(-)