[Spca50x-devs] Self Introduction: Hans de Goede

[Michel Xhaard]

Le vendredi 28 mars 2008 22:44, Hans de Goede a écrit :
> Hi All,
>
> I'm a Linux enthusiast / developer. Lately I'm mainly active doing
> development for Fedora and writing kernel drivers (and as my day job I'm a
> lecturer in Computer Science).
>
> Fedora has a policy of not shipping a heavily patched kernel, but instead
> tries to work with upstream to get any needed patches integrated. This
> policy extends to not shipping any addon drivers, but rather working to get
> drivers integrated upstream.
>
> As such I've decided to start spending my spare time on getting more and
> better usb webcam support integrated upstream (for non usb video class
> devices). I wanted to have something to show, so I've gone to the store,
> bought a couple of webcams and started hacking and learning.
>
> 2 days ago I have finished my first pretty clean, standalone v4l2 webcam
> driver for Pixart pac207 webcams.
>
> In the beginning I modelled this driver after the zc301 and sn9c102 driver
> which are currently already in the mainline kernel, using the memory
> management and other structure from these drivers and filling in the
> hardware dependent parts with the pac207 code from the out of tree gpsca
> driver.
>
> During the development I kept the buffer management from the zc301 driver,
> but modelled the rest of the driver more and more after gspca. For example
> don't start the iso stream on device open and throw away iso packets
> received before the stream-on ioctl, but instead start and stop the stream
> as needed.
>
> This has resulted in what I consider a nice and clean pac207 driver. But
> when I finished it I noticed that a lot of code in their was generic code
> for any simple usb webcam.
>
> Since I plan to write standalone v4l2 drivers for mainline inclusion for
> other simple usb webcams I spend the last 2 days splitting the code of my
> pac207 driver into a generic usbvideo2 core (the kernel already has
> usbvideo, which has a number of v4l1 drivers) and a camera specific pac207
> driver which builds on top of the usbvideo2 core.
>
> So I've ended up with a model very much like gspca, but then not one large
> monolithic kernel module, but a more modular design with an core kernel
> module with (hopefully) generic code for simple usb webcam's, and a per usb
> controller chip type specific module (currently only one for pac207
> controllers), and ofcourse very important this is code for v4l2 drivers,
> whereas the current gspca is v4l1.
>
> I just recently (today) learned that there is work underway to make a v4l2
> version of gspca by Jean-François Moine: http://moinejf.free.fr/ ), I hope
> that we can work together somehow on getting support for all the webcam's
> supported in gscpa integrated into the mainline kernel with a v4l2
> interface.
>
> I'll be sending 2 seperate mails one with my standalone pac207 driver, and
> one with the usbvideo2 core and a pac207 driver using this core, I'll
> include Makefiles for out of tree building with both of them so that
> interested people can test them.
>
> I'm currently posting these as .c files for easy reading and compilation /
> testing, but I still hope to get a lot of feedback / a thorough review, esp
> of the core <-> pac207 split version as I hope to submit that as a patch
> for mainline inclusion soon.
>
> Thanks & Regards,
>
> Hans
>
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Hans,
I don't understand why you start this work without asking the gspca 
maintener ? Jean-Francois is working on the gspca_core driver for v4l2, you 
should help if you want.The pac207 maintener is Thomas, feel free to contact 
the spca50x-devel mailing list.
If you have times you can try to implement the sn9c201 sn9c202 from Sonix, 
there is only a proprietary driver available at the moment ;-)
regards
-- 
Michel Xhaard
http://mxhaard.free.fr