Hi folks, I tried to use a tool called hidmon to control man TFT over USB. That worked a few times, but now I noticed that the hiddev device node in /dev/usb/ went away. I didn't kow why. I rebooted the computer, changed from Linux 2.6.23.1 to 2.6.22, powercycled the TFT, without luck. As soon as I use hidmon, the device node is gone.
Now I compiled the libhid test program test_libhid.c and got the same effect. It seems like hid_force_open() kills the device, as udev receives a remote udevent. Here is what I did: $ ls -l /dev/usb total 0 crw-rw---- 1 root root 180, 96 Nov 11 20:27 hiddev0 crw-rw---- 1 root root 180, 97 Nov 11 21:50 hiddev1 crw-rw---- 1 root lp 180, 0 Nov 11 21:30 lp0 $ sudo ./test_libhid NOTICE: hid_init(): libhid 0.2.15+20060325.0.0 is being initialized. TRACE: hid_init(): initialising USB subsystem... TRACE: hid_init(): scanning for USB busses... TRACE: hid_init(): scanning for USB devices... NOTICE: hid_init(): successfully initialised HID library. TRACE: hid_new_HIDInterface(): creating a new HIDInterface instance... TRACE: hid_force_open(): forcefully opening a device interface according to matching criteria... TRACE: hid_get_usb_handle(): acquiring handle for a USB device... TRACE: hid_find_usb_device(): enumerating USB busses... TRACE: hid_find_usb_device(): enumerating USB devices on bus 001... TRACE: hid_find_usb_device(): inspecting USB device 001/056[0]... TRACE: hid_compare_usb_device(): comparing match specifications to USB device... TRACE: hid_compare_usb_device(): inspecting vendor ID... TRACE: hid_compare_usb_device(): match on vendor ID: 0x056d. TRACE: hid_compare_usb_device(): inspecting product ID... TRACE: hid_compare_usb_device(): match on product ID: 0x0002. TRACE: hid_compare_usb_device(): no custom matching function supplied. NOTICE: hid_find_usb_device(): found a matching USB device 001/056[0]. TRACE: hid_force_open(): claiming USB device 001/056[0]. TRACE: hid_os_force_claim(): failed to claim USB device 001/056[0], trying 2 more time(s)... TRACE: hid_os_force_claim(): detaching kernel driver from USB device 001/056[0]... TRACE: hid_os_force_claim(): trying again to claim USB device 001/056[0]... NOTICE: hid_force_open(): successfully claimed USB device 001/056[0]. TRACE: hid_init_parser(): initialising the HID parser for USB Device 001/056[0]... TRACE: hid_init_parser(): allocating space for HIDData structure... TRACE: hid_init_parser(): successfully allocated memory for HIDData strcture. TRACE: hid_init_parser(): allocating space for HIDParser structure... TRACE: hid_init_parser(): successfully allocated memory for HIDParser strcture. NOTICE: hid_init_parser(): successfully initialised the HID parser for USB Device 001/056[0]. TRACE: hid_prepare_hid_descriptor(): initialising the HID descriptor for USB device 001/056[0]... TRACE: hid_prepare_hid_descriptor(): retrieving HID descriptor for USB device 001/056[0]... WARNING: hid_prepare_hid_descriptor(): failed to get HID descriptor for USB device 001/056[0] TRACE: hid_close(): closing USB device 001/056[0]... TRACE: hid_close(): closing handle of USB device 001/056[0]... NOTICE: hid_close(): successfully closed USB device 001/056[0]. TRACE: hid_reset_parser(): resetting the HID parser for USB device 001/056[0]... TRACE: hid_close(): freeing memory allocated for HID parser... TRACE: hid_close(): resetting HIDInterface... hid_force_open failed with return code 13 $ ls -l /dev/usb total 0 crw-rw---- 1 root root 180, 96 Nov 11 20:27 hiddev0 crw-rw---- 1 root lp 180, 0 Nov 11 21:30 lp0 While i was doing the above, I also had udevmonitor running: $ sudo udevmonitor --kernel udevmonitor will print the received events for: UEVENT the kernel uevent UEVENT[1194814320.814394] remove /devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1.3/1-1.3:1.0/usb/hiddev1 (usb) UEVENT[1194814320.814458] remove /devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1.3/1-1.3:1.0/usb_endpoint/usbdev1.56_ep81 (usb_endpoint) UEVENT[1194814320.814477] add /devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1.3/1-1.3:1.0/usb_endpoint/usbdev1.56_ep81 (usb_endpoint) UEVENT[1194814320.814494] remove /devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1.3/1-1.3:1.0/usb_endpoint/usbdev1.56_ep81 (usb_endpoint) UEVENT[1194814320.814511] add /devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1.3/1-1.3:1.0/usb_endpoint/usbdev1.56_ep81 (usb_endpoint) Anyone knows what's going on here, and how to fix it? Please CC: me on replies to the list, as I'm not subscribed. Regards, Tino _______________________________________________ libhid-discuss mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss
