Re: HID device communication problem with kernel 2.4
Pete Zaitcev <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Organization | Red Hat, Inc. |
| Message-ID | <[email protected]> |
On Thu, 21 Jun 2007 22:39:32 +0200, Szilvási Bertalan <[email protected]> wrote: > Communication is done with blocks of 9 values. I send 9 usage_refs to the > device using HIDIOCSUSAGE and HIDIOCSREPORT ioctl calls, and wait for the > reply. Using cat /dev/usb/hiddev0 I can see that answer has arrived. But > only at the first time! After that, no reply arrives, until I press a button > on the device. Then the button pressed data can be seen, and after that the > serial number query works correctly again for _one_ time, and stops working > until the next button event. Setting LEDs and reading button events work > always. It seems that only messages that need reply from the device fail. I see your message, but I don't have an immediate answer. Devices routinely communicate blocks of values. This needs looking into. It may be something as simple as a missing wake_up(), but I don't know. Please let me know if you uncover something new and/or come with a patch. -- Pete ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel