platform/x86: thinkpad_acpi: Register a privacy-screen device
Register a privacy-screen device on laptops with a privacy-screen, this exports the PrivacyGuard features to user-space using a standardized vendor-agnostic sysfs interface. Note the sysfs interface is read-only. Registering a privacy-screen device with the new privacy-screen class code will also allow the GPU driver to get a handle to it and export the privacy-screen setting as a property on the DRM connector object for the LCD panel. This DRM connector property is a new standardized interface which all user-space code should use to query and control the privacy-screen. Reviewed-by:Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by:
Lyude Paul <lyude@redhat.com> Reviewed-by:
Mark Pearson <markpearson@lenovo.com> Signed-off-by:
Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211005202322.700909-9-hdegoede@redhat.com
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