On Mon, Feb 23, 2015 at 11:34:57PM +0100, Pavel Machek wrote: > On Thu 2015-02-19 15:14:24, Felipe Balbi wrote: > > Hi, > > > > Do we have support for LED controllers which can handle patterns of > > different kinds ? I mean, currently, if we have an LED controller such > > as TPIC2810 [1] which can control 8 different leds and each LED > > corresponds to one bit on register 0x44, we could control leds by just > > "playing" a wave file on the controller and create easy patterns with > > that. > > > > AFAICT, in linux today we would have to register each of the 8 LEDs as a > > different LED and have driver magic to write the proper bits on register > > 0x44, that seems a bit overkill, specially when we want to make > > patterns: instead of writing 0xff we would have to write 0x80, 0x40, > > 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 separately and have the driver cache > > the previous results so we don't end up switching off other LEDs. > > > > IOW, what could be handled with a single write, currently needs 8. > > > > I wonder if there's any work happening to support these slightly more > > inteligent LED engines. > > > > regards > > > > [1] http://www.ti.com/product/tpic2810 > > > > ps: tpic2810 is probably the simplest example, lp551, lp5523 and others > > have even more advanced pattern engines which can even handle RGB leds. > > Well... some more advanced pattern engines can actually run code, up > to and including prime number computation. So yes, this is complex, > and how to handle it nicely is a question... > > I have "notcc" to compile for that. right, the point is that this is a solution which only works with lp5523 and IMO linux led subsystem should do a little more for such devices. -- balbi
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