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cros_kbd_led_backlight uses ACPI_KEYBOARD_BACKLIGHT_WRITE and ACPI_KEYBOARD_BACKLIGHT_READ for setting and getting the brightness respectively. Separate ACPI operations for preparing the driver to support other backends. Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Reviewed-by: Guenter Roeck <groeck@chromium.org> Link: https://lore.kernel.org/r/20220523090822.3035189-3-tzungbi@kernel.org