staging: olpc_dcon: Use backlight helper
Instead of retrieving the backlight brightness in struct backlight_properties manually, and then checking whether the backlight should be on at all, use backlight_get_brightness() which does all this and insulates this from future changes. Cc: Jens Frederich <jfrederich@gmail.com> Cc: Jon Nettleton <jon.nettleton@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-staging@lists.linux.dev Signed-off-by:Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20220607190049.1132154-1-steve@sk2.orgSigned-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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