[media-workshop] V2: Agenda for the Edinburgh mini-summit

Laurent Pinchart laurent.pinchart at ideasonboard.com
Tue Sep 24 12:56:49 CEST 2013


Hi Oliver,

On Monday 23 September 2013 18:37:48 Oliver Schinagl wrote:
> On 09/23/13 16:45, Sylwester Nawrocki wrote:
> > Hi,
> > 
> > I would like to have a short discussion on LED flash devices support
> > in the kernel. Currently there are two APIs: the V4L2 and LED class
> > API exposed by the kernel, which I believe is not good from user space
> > POV. Generic applications will need to implement both APIs. I think we
> > should decide whether to extend the led class API to add support for
> > more advanced LED controllers there or continue to use the both APIs
> > with overlapping functionality.
> > There has been some discussion about this on the ML, but without any
> > consensus reached [1].
> 
> What about the linux-pwm framework and its support for the backlight via
> dts?
> 
> Or am I talking way to uninformed here. Copying backlight to flashlight
> with some minor modification sounds sensible in a way...

Flash has more advanced requirements, such as internal/external trigger 
support, hardware timings control, overheat prevention, ... Furthermore, a 
flash API should not be limited to LEDs, as Xeon flashes are common and 
similar enough to be supported by the same API.

I would like to see the two APIs merged in a way, at least for flash devices.

-- 
Regards,

Laurent Pinchart




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