From: Matt Ranostay Date: Sat, 9 Jun 2018 06:58:15 +0000 (-0700) Subject: tsl2550: fix lux1_input error in low light X-Git-Tag: v5.15~8190^2~134 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ce054546cc2c26891cefa2f284d90d93b52205de;p=platform%2Fkernel%2Flinux-starfive.git 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 Cc: Greg Kroah-Hartman Signed-off-by: Matt Ranostay Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/tsl2550.c b/drivers/misc/tsl2550.c index adf4607..3fce3b6 100644 --- a/drivers/misc/tsl2550.c +++ b/drivers/misc/tsl2550.c @@ -177,7 +177,7 @@ static int tsl2550_calculate_lux(u8 ch0, u8 ch1) } else lux = 0; else - return -EAGAIN; + return 0; /* LUX range check */ return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux;