Ezequiel, Not sure, but this may help you: http://lwn.net/Articles/464276/ []'s Peter 2012/3/14 Ezequiel García <elezegarcia@gmail.com>:
Hi,
I'm writing a video capture device and have a doubt about how to correctly print to screen.
First, I suppose I should follow the rule "don't print unless there is something surprising to say", right? Second, I've found I need to print in a very verbose manner at developing stage so I should implement a debug param. I will probably adopt videobuf2 way (like many others) of defining a macro (dprintk or something).
However, reading the source I've found there isn't a unified way to do this: some use printk (as defined macros), others use v4l_xxx, others use dev_xxx.
I've adopted the latter, because I thought there could be many devices plugged, and using dev_xxx with the usb_device->dev helps seeing which is tracing.
I'm not really sure if it is ok so I would love to hear some opinions about this sensible issue.
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-- Peter Senna Tschudin peter.senna@gmail.com gpg id: 48274C36