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+sysfs interface for Texas Instruments lm3639 backlight + flash led driver chip
+------------------------------------------------------------------------------
+
+What: /sys/class/backlight/<backlight>/bled_mode
+Date: Oct, 2012
+KernelVersion: v3.10
+Contact: dri-devel@lists.freedesktop.org
+Description:
+ (WO) Write to the backlight mapping mode. The backlight current
+ can be mapped for either exponential (value "0") or linear
+ mapping modes (default).