This device is register compatible with LTR501, with a minor difference for
ALS control register as showed below:
ALS Control register for LTR501:
7 6 5 4 3 2 1 0
+------+------+------+------+------+------+------+------+
| | | | |
| Reserved | Gain | SW | ALS Mode |
| | | Reset| |
+------+------+------+------+------+------+------+------+
ALS Control register for LTR559:
7 6 5 4 3 2 1 0
+------+------+------+------+------+------+------+------+
| | | | |
| Reserved | Gain | SW | ALS |
| | | Reset| Mode |
+------+------+------+------+------+------+------+------+
We handle this difference by introducing ltr501_chip_info.
Datasheet for LTR559 is at:
http://optoelectronics.liteon.com/upload/download/DS86-2013-0003/S_110_LTR-559ALS-01_DS_V1.pdf
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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