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Commit 64efd66f authored by Matt Ranostay's avatar Matt Ranostay Committed by Greg Kroah-Hartman
Browse files

tsl2550: fix lux1_input error in low light 



[ Upstream commit ce054546cc2c26891cefa2f284d90d93b52205de ]

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: default avatarMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0d20b84e

drivers/misc/tsl2550.c

+1 −1
Original line number Diff line number Diff line
@@ -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;