This makes sure we e.g. prefer multicolor leds over single color ones
and those that can be on insuspend (qcom) over those that can't.
We can extend this to allow to set the priority via udev/hwdb in the
future.
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Camera flashes are also exported via the LED subsystem. We use a
separate LED type so they're not picked by default.
We don't use them as fallbacks either.
QCOM LPG LEDs can also operate in a multicolor fashion.
Re-use the probing sequence of multicolor LEDs and the hw_pattern
configuration of single color QCOM LPG LEDs.
QCOM LPG LEDs expose a hw_pattern sysfs entry which accepts a limited
set of patterns but allows to use dedicated hardware for blinking the
LED. This way, battery life can be improved and the LED still blinks,
even if the device is suspended.
Provide our own supports_color method to specify which colors are
actually implemented by the driver. RGB LEDs could provide different
colors as well such as orange, purple, etc. but those are not supported
yet.
Drop has_color API since supported colors are set during probing
and can be handled completely separately from the classes for
each type of hardware.
Rename set_color to set_supported_color because the usage
of this API is to check if the color is supported, but not
setting it. Setting the color is also separated from
start_periodic API to re-use multicolor across multiple LED types
with a set_color API. Multicolor LEDs are actually the same as
regular LEDs but they require a few additional sysfs entries to
actually set the color. Single color LEDs only have a single color
so the set_color method just returns TRUE for these LEDs.
Supported colors are advertised through the supports_color API now.
This way, each LED driver define which colors are supported
through supports_color API. RGB multicolor LEDs will report only fixed colors
like red, blue, green and white until the kernel can expose if a diffusor
is present to mix these colors.
Sicelo A. Mhlongo
Guido Günther
knoppix knoppix
Dylan Van Assche