On Thu, Sep 14, 2017 at 09:56:26AM -0700, Rail Shafigulin wrote: > On Thu, Sep 14, 2017 at 2:21 AM, Oliver Neukum <oneukum@xxxxxxxx> wrote: > > Hi, > > > > either the camera (to be precise: an interface of it) advertises > > itself as UVC compliant and implements the UVC standard. If that > > is the case the existing kernel driver will work and user space > > can use the V4L API to use the camera. > > > > (Theoretically a device can be so stupid that it implements the protocol > > but does not advertise that. Then you need to add the id to the uvc kernel driver) > > > > > > If the camera does not implent UVC, you will have to write a kernel > > driver for it, which needs to implement the V4L API. > > > > Does this clean up the confusion? > > > > Regards > > Oliver > > > Thanks for the reply. That does clarify it. But I still have a few > more questions. > > 1. What makes camera UVC compliant? Is there a document describing > this? I have access to the hardware (or I should say access to the > hardware engineers) and can make it compliant. The UVC spec describes that. Please refer to that large specification for the details. > 2. If making camera UVC compliant is a software issue, then I can > certainly make changes to UVC, I just don't know what is good starting > point for this. I'd appreciate if someone could point me in the right > direction (i.e. take a look at this function in this file and it will > get you started). No need to handhold, but a little help navigating > UVC/USB is appreciated. It's all software, this question doesn't really make much sense. Go read the spec for the details please. > 3. In case items 1 and 2 are not the steps that I need to take, I will > write a V4L driver. V4L is quite complex and I have the same request > here as in item 2. What is a good starting point to write a V4L > driver? Is there a template file I could use? Would Virtual Video > Driver (vivid) be a good place to look at? There's lots of documentation in the kernel about this, have you read that? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
