[PATCH v3 0/2] Add ps_it attributes for vcnl4040

["Mårten Lindahl" <marten.lindahl@axis.com>]

Currently there is no way for userspace to make any configuration of
the VCNL4040 sensors, but only the sensor readings are exported in
sysfs. To support configuration for proximity integration time value,
sysfs attributes for this needs to be exported.

To begin with the runtime power management turns both sensors (ALS, and
PS) on before reading the sensor register values and then switches
them off again. But when doing so it writes the whole register instead
of just switching the power on/off bit. This needs to be fixed in order
to make other persistent configurations.

Kind regards
Mårten Lindahl

Changes in v3:
 - Rename defines for ALS/PS shutdown bits
 - Add local variable for building register value

Changes in v2:
 - Removed unnecessary switch for chip id
 - Guard read/write sequence against potential race
 - Remove confusing boolean operation
 - Use bitmask macros instead of local field shifting
 - Use .read_avail callback instead of using IIO_CONST_ATTR
 - Skip [PATCH 2/3] iio: light: vcnl4000: Add enable attributes for vcnl4040

Mårten Lindahl (2):
  iio: light: vcnl4000: Preserve conf bits when toggle power
  iio: light: vcnl4000: Add ps_it attributes for vcnl4040

 drivers/iio/light/vcnl4000.c | 185 +++++++++++++++++++++++++++++++++--
 1 file changed, 179 insertions(+), 6 deletions(-)

-- 
2.30.2