Dear Experts, I have been experimenting with some code that uses usbfs to implement a simple driver in user space. It basically works, but there are some corner-cases where I need to be certain that I'm doing the right thing.
Claiming devices: I understand how the usb core offers new devices to kernel drivers based on the struct usb_device_id. Is there any way for my user-space driver to influence this process? (A sufficient solution for me for the time being would be a way to temporarily disable the kernel matching while my user-space code is running; for example, I'd be happy to load a small kernel module that clobbers the existing matching somehow.) Choosing configurations: It looks as if I get two uevents when a device is attached, one for the unconfigured device and another once the core has done SetConfiguration. Is there any way for my driver to influence the SetConfiguration process? Presumably I could do a USBDEVFS_SETCONFIGURATION if I were unhappy with the configuration that it had chosen. (Is there any way for a kernel driver to influence the SetConfiguration process?) Order of events: I have some code that listens for KOBJECT_UEVENTs using netlink and then opens the corresponding /proc/bus/usb/ file. But this sometimes fails, because the uevents are sent before the files are created. I could simply retry, but there's also the converse situation where the device has already been removed (e.g. it has "bounced") to worry about - is there a better way to do this? Any advice would be much appreciated. Regards, Phil. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
