Re: [RFC] What are the goals for the architecture of an in-kernel IR system?
From: Mauro Carvalho Chehab <hidden>
Date: 2009-12-01 13:12:09
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linux-media, lkml
Gerd Hoffmann wrote:
On 11/30/09 13:34, Mauro Carvalho Chehab wrote:quoted
Christoph Bartelmus wrote:quoted
Hi Mauro, I just don't want to change a working interface just because it could be also implemented in a different way, but having no other visible advantage than using more recent kernel features.I agree. The main reasons to review the interface is: 1) to avoid any overlaps (if are there any) with the evdev interface;Use lirc for raw samples. Use evdev for decoded data. Hardware/drivers which can handle both can support both interfaces. IMHO it makes no sense at all to squeeze raw samples through the input layer. It looks more like a serial line than a input device. In fact you can homebrew a receiver and connect it to the serial port, which was quite common in pre-usb-ir-receiver times.
I agree.
quoted
2) to have it stable enough to be used, without changes, for a long time.It isn't like lirc is a new interface. It has been used in practice for years. I don't think API stability is a problem here.
You're probably right here, but, as, currently, changing the API is not a problem, I don't doubt that the API has changed during those years (I haven't followed lirc API, so this is just an educated guess). So, all I'm saying is that we should do a final review considering API stability before merging it, eventually considering to add a few reserved fields there, if we suspect that we might need more space for some reason.
quoted
True, but even if we want to merge lirc drivers "as-is", the drivers will still need changes, due to kernel CodingStyle, due to the usage of some API's that may be deprecated, due to some breakage with non-Intel architectures, due to some bugs that kernel hackers may discover, etc.I assumed this did happen in already in preparation of this submission?
Yes, for just a few drivers that went on the first series of patches (on Jerod's proposal, only 2 drivers were submitted). Cheers, Mauro.