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    • M
      backlight: Expose brightness curve type through sysfs · d55c028f
      Matthias Kaehlcke 提交于
      Backlight brightness curves can have different shapes. The two main
      types are linear and non-linear curves. The human eye doesn't
      perceive linearly increasing/decreasing brightness as linear (see
      also 88ba95be "backlight: pwm_bl: Compute brightness of LED
      linearly to human eye"), hence many backlights use non-linear (often
      logarithmic) brightness curves. The type of curve currently is opaque
      to userspace, so userspace often uses more or less reliable heuristics
      (like the number of brightness levels) to decide whether to treat a
      backlight device as linear or non-linear.
      
      Export the type of the brightness curve via the new sysfs attribute
      'scale'. The value of the attribute can be 'linear', 'non-linear' or
      'unknown'. For devices that don't provide information about the scale
      of their brightness curve the value of the 'scale' attribute is 'unknown'.
      Signed-off-by: NMatthias Kaehlcke <mka@chromium.org>
      Reviewed-by: NDaniel Thompson <daniel.thompson@linaro.org>
      Signed-off-by: NLee Jones <lee.jones@linaro.org>
      d55c028f