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 > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplac >e _______________________________________________ > Spca50x-devs mailing list > Spca50x-devs@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/spca50x-devs 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 _______________________________________________ Fedora-kernel-list mailing list Fedora-kernel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-kernel-list
