On 10/10/16 21:57, Jonathan Cameron wrote:
> On 10/10/16 08:20, Brian Masney wrote:
>> Add ABI documentation from the ISL29018 Data Sheet (FN6619.4, Oct 8,
>> 2012) about the infrared suppression that can be controlled
>> with the proximity_on_chip_ambient_infrared_suppression sysfs attribute.
>> Signed-off-by: Brian Masney <masn...@onstation.org>
> I'm going to let this and the final move out of staging sit on the
> list a while longer to gather reviews.
Meh. Long enough ;)
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to ignore it.
> It does feel like the below is rather cryptic and it might be possible
> to use a simpler description... Maybe this is the best we can do.
> The naming makes it sound generic, but in reality it's a nasty bit
> of custom filtering that is not well described anywhere.
>> .../ABI/testing/sysfs-bus-iio-light-isl29018 | 19
>> 1 file changed, 19 insertions(+)
>> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-light-isl29018
>> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-light-isl29018
>> new file mode 100644
>> index 0000000..f0ce0a0
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/sysfs-bus-iio-light-isl29018
>> @@ -0,0 +1,19 @@
>> +Date: January 2011
>> +KernelVersion: 2.6.37
>> +Contact: linux-...@vger.kernel.org
>> + From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the
>> + infrared suppression:
>> + Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned) proximity
>> + detection. The range of Scheme 0 proximity count is from 0 to
>> + 2^n. Logic 1 of this bit, Scheme 1, makes n-1 (3, 7, 11, 15)
>> + bits (2's complementary) proximity_less_ambient detection. The
>> + range of Scheme 1 proximity count is from -2^(n-1) to 2^(n-1).
>> + The sign bit is extended for resolutions less than 16. While
>> + Scheme 0 has wider dynamic range, Scheme 1 proximity detection
>> + is less affected by the ambient IR noise variation.
>> + 0 Sensing IR from LED and ambient
>> + 1 Sensing IR from LED with ambient IR rejection
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