tree c1bed972eaf4f9b1bca1df6861aecddf761fcda1
parent 6051e79bbfa6111c3a56a86fa8c6ff9a248e30a6
author Matt Ranostay <matt.ranostay@konsulko.com> 1528527495 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1530978292 +0200

tsl2550: fix lux1_input error in low light

ADC channel 0 photodiode detects both infrared + visible light,
but ADC channel 1 just detects infrared. However, the latter is a bit
more sensitive in that range so complete darkness or low light causes
a error condition in which the chan0 - chan1 is negative that
results in a -EAGAIN.

This patch changes the resulting lux1_input sysfs attribute message from
"Resource temporarily unavailable" to a user-grokable lux value of 0.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>