Hello, I'm planing to make a new camera interface driver for S3C64XX from Samsung. Even if it already has a driver, it seems to be re-designed for some reasons. If you are interested in, take a look at following repository (http://git.kernel.org/?p=linux/kernel/git/eyryu_ap/samsung-ap-2.6.24.git;a=summary) drivers/media/video/s3c_* files
Before beginning to implement a new driver for that, I need to clarify some of features about how to implement in driver. Please take a look at the diagram on page 610 of following user manual of s3c6400. http://www.ebv.com/fileadmin/products/Products/Samsung/S3C6400/S3C6400X_UserManual_rev1-0_2008-02_661558um.pdf It seems to have a couple of path for camera data named codec and preview, and they could be used at the same time. It means that it has no problem making those two paths into independent device nodes like /dev/video0 and /dev/video1 But there is a limit of size using both of paths at the same time. I mean, If you are using preview path and camera sensor is running with 1280*720 resolution (which seems to be the max resolution could be handled by preview path), codec path can't use resolution bigger than 1280*720 at the same time because camera sensor can't produce different resolution at a time. And also we should face a big problem when we are making dual camera system with s3c64xx. Dual camera with single camera interface has some restriction using clock and data path, because they have to be shared between both of cameras. I suppose to handle them with VIDIOC_S_INPUT and G_INPUT. And with those, we can handle dual camera with single camera interface in a decent way. But the thing is that there should be a problem using dual camera with preview and codec path of s3c64xx. Even if we have each preview, and codec device node and can't open them concurrently when user is attempting to open each camera sensor like "camera A with preview node and camera B with codec node". Because both of those camera sensors are sharing same data path and clock source, and s3c64xx camera interface only can handle one camera at a time. So, what I am concerned is how to make it a elegant driver which has two device nodes handling multiple sensors as input devices. Sounds complicated but I'm asking you to help me with any opinion about designing this driver. Any opinion about these issues will be greatly helpful to me. Cheers, Nate -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
