On Sun, Sep 12, 2004 at 04:33:13AM +0400, Alexander N. Kozhushkin was heard to remark: > > Unfortunately, now I cannot present a full list of device drivers > which use the first and second approaches. However, the > "drivers/input/mousedev.c" file by Vojtech Pavlik is an example of > such a device driver. It offers the first approach for the mouse-like > devices with the minor numbers from 0 to 30, and the second one for > the so-called "MOUSEDEV_MIX" device with minor number 31. > > Here is a patch for kernel 2.6.7 which makes that driver use the > third approach for the devices with minor numbers 0--30. Most likely, > the patch can be used for kernels 2.6.8 and 2.6.9 too. The archive > "tests.tgz" contains some very simple programs to test the patch and > the original mouse driver. The description of the changes to the > "mousedev.c" file can be found in the "patch.txt" file.
Please don't gzip the patches, and please use 'unified diff' format (diff -up), this makes it easier to read the patch. > The 'gpm' program, properly rewritten by me to support hotplug > mice, and the above tests work reliably on my computer with the > modified mouse driver. The X-server works reliably too if it uses the > data supplied by the modified version of the 'gmp', instead of the > real mouse data. What happens if the x-server is connected directly to the mouse? Can I unplug one mouse, and plug in a different mouse and still have it work? I think you might want to cc the appropriate mailing list on x.org about this. --- Another alkternative to returning -ENODEV is to have a zero-length read. This is a traditional unix way of signifying that the remote end has disconnected; e.g. for tcp sockets. That is, select() will tell you that there is something to read, and the read() call will suceed (without error), and return zero bytes read. For tcp, this is understood to mean that the far side has closed its socket. I'm not sure, but maybe this would also make sense for any USB device that can be read with open(), read() calls? --linas ------------------------------------------------------- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
