Building with the attached random configuration file,

drivers/input/misc/regulator-haptic.c: In function ‘regulator_haptic_probe’:
drivers/input/misc/regulator-haptic.c:184:2: error: implicit
declaration of function ‘devm_regulator_get_exclusive’
[-Werror=implicit-function-declaration]
  haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic");
  ^
drivers/input/misc/regulator-haptic.c:184:20: warning: assignment makes pointer
from integer without a cast [enabled by default]
  haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic");
                    ^
cc1: some warnings being treated as errors
make[3]: *** [drivers/input/misc/regulator-haptic.o] Error 1