[lm-sensors] [RFC PATCH 0/3] Support for all SHT15 features

Guenter Roeck guenter.roeck at ericsson.com
Wed Mar 16 22:04:14 CET 2011

On Wed, 2011-03-16 at 14:44 -0400, Vivien Didelot wrote:
> The SHT15 sensor supports several functionalities such as i/o
> checksumming, an embedded heater for dew point cross-validation, two
> resolution settings and a device-specific feature known as OTP reload.
> This set of patches brings the ability to use these features.
> The first patch adds support for CRC calculation.
> The second patch adds the ability to read the status register through
> several sysfs attributes.
> The last one adds support to change the status register, through
> those individual sysfs attributes.
> Jerome Oufella (1):
>   hwmon: sht15: add checksum validation support
> Vivien Didelot (2):
>   hwmon: sht15: add support for reading the status register
>   hwmon: sht15: add support for writing the status register
>  drivers/hwmon/sht15.c |  525 ++++++++++++++++++++++++++++++++++++++++++++++---
>  1 files changed, 499 insertions(+), 26 deletions(-)
All those undocumented sysfs attributes ....

Two questions:
- Which of the new attributes are really expected to change during
  runtime ?
  If an attribute is not expected to change during runtime, it should be
  configured statically (eg with platform data or device tree), and not
  with a sysfs attribute.
- For any remaining attributes, does they really add value ?
  If they adds value, it may add value for other drivers as well and may
  warrant an ABI extension. If so, that should be discussed.

Either case, I would expect attributes to be documented. If that means
that driver documentation needs to be added in the first place because
it does not exist - maybe that should be first priority anyway before
adding new functionality to a driver.


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