linux-kernel - Re: [PATCH 1/9] can: add tx/rx LED trigger support

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Date:	Mon, 17 Dec 2012 21:20:57 +0100
From:	"Bernd Krumböck" <krumboeck@...versalnet.at>
To:	"Fabio Baltieri" <fabio.baltieri@...il.com>,
	"Bernd Krumboeck" <krumboeck@...versalnet.at>,
	"Marc Kleine-Budde" <mkl@...gutronix.de>,
	linux-can@...r.kernel.org,
	"Kurt Van Dijck" <kurt.van.dijck@....be>,
	"Wolfgang Grandegger" <wg@...ndegger.com>,
	"Oliver Hartkopp" <socketcan@...tkopp.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] can: add tx/rx LED trigger support

> Hi Bernd,
>
> On Mon, Dec 17, 2012 at 08:28:48AM +0100, Bernd Krumboeck wrote:
>> Why there is no patch for any usb can device?
>
> Because USB canbus interfaces usually already has some dedicated
> activity LED on the device itself, while this patch is meant to give an
> equivalent functionality for Embedded SoC with GPIO based LEDs, so I
> just started by modifying some Embedded CAN drivers.
>
> If you think it's useful for USB controller, just tell me or modify the
> driver by yourself!  As you see the patch is really easy.

At least it is useful for the usb_8dev driver. I'll write a patch.

Photo of the device:
http://www.8devices.com/product/2/usb2can

>> Can this be done in a more general way, except patching every driver?
>
> Actually this started as a generic patch bolted to the CAN stack, but
> the implementation was too invasive and a bit too hacky.  A generic
> implementation at can-dev level is hard to obtain because the can-dev
> layer is not used in all the device operation, as the most of the driver
> calls generick network API directly.
>

Thanks!

regards,
Bernd
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