Hello, I am very new to Linux Kernel framework. All I did is an adaptation of an existing driver (LegoTower) for my specific application it was working well until I had to add an other communication endpoints pair. I am now dealing with the problem of accessing to two endpoints with the same driver. I found several tricks : > using IOCtrl but I still have the problem of multi threaded access, > then I thought to adding a "trick" like : first byte of writing indicates which endpoint shall be written and the read data the first byte is indicating where the data comes from but the I feel it is not the good way to do. Then I thought multiple dev could be the solution, I browsed the usb kernel driver sources but it seems that the rule is one dev per device driver. So I start working on Linux-usb mailing list archives. Then I found evocation of usbfs2 which seems to be exactly what I need. I looked for documentation, I saw the vid of Sarah presentation (very impressive) and started to get her sources from her git. I am not a specialist of Git either but basically what I got is an image of Kernel Src. Browsing exchange about "multiple devices for one Usb interface" topic in archives, I noticed an email from Sarah which mentionned her code was in the file : "drivers/usb/core/endpoint_ fops.c" But I don't have it in the files I cloned from sarah git. So my question is simple, is there an HOW TO use usbfs2 ? Is there a documentation about usbfs2 which explains how it's work and what shall be done to make it acceptable to the main kernel tree. As I told, I am not a Linux expert ( I am coming from very low embedded application on µcontrollers ) but I have to make it works so my idea is that with some help and "guide lines" from the expert you have, it could be a good way to start to give back to those who gave (and are giving) us so much (Open Source Community). Sorry for being so long and my poor english. I will go on searching by myself but help would be really appreciated. Take Care. Sylvain PORTES. -- 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
