• pali's avatar
    platform: x86: dell-laptop: Add support for keyboard backlight · 02b2aaaa
    pali authored
    
    
    This patch adds support for configuring keyboard backlight settings on supported
    Dell laptops. It exports kernel leds interface and uses Dell SMBIOS tokens or
    keyboard class interface.
    
    With this patch it is possible to set:
    * keyboard backlight level
    * timeout after which will be backlight automatically turned off
    * input activity triggers (keyboard, touchpad, mouse) which enable backlight
    * ambient light settings
    
    Settings are exported via sysfs:
    /sys/class/leds/dell::kbd_backlight/
    
    Code is based on newly released documentation by Dell in libsmbios project.
    
    Thanks to Dan Carpenter who reported bug about unpredictable results in
    quirks->kbd_timeouts for loop. His fix adds needs_kbd_timeouts flag to
    quirk structure to indicate if kbd_timeouts array is empty or not.
    Signed-off-by: pali's avatarPali Rohár <pali.rohar@gmail.com>
    Signed-off-by: Gabriele Mazzotta's avatarGabriele Mazzotta <gabriele.mzt@gmail.com>
    Cc: Dan Carpenter <dan.carpenter@oracle.com>
    Minor English corrections to comments.
    Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
    02b2aaaa