Hi, I am trying to write a comedi (drivers/staging/comedi) based driver for the National Instruments USB 6008 USB based data acquisition card. I have created a basic but more simpler structure for the drivers based on usbdux driver which are already present. I have got to the point where the device is detected and drivers are loaded. The /dev/comedi0 device file is created. I am unable to deal with the data transfer. When I try to run xoscope that is used to read the output from the card - the card freezes (the status lights stop blinking). Output from the lsusb : https://github.com/prashants/temptest/blob/8e81e7fb4ea260fa24e68f43c185d768a... Source of the driver : https://github.com/prashants/temptest/blob/8e81e7fb4ea260fa24e68f43c185d768a... Device : http://sine.ni.com/nips/cds/view/p/lang/en/nid/201986 I am not interested in the digital input/output and analog output at this point. My main concern is the ability to read the analog input. ---------------------------------------------------- Apr 29 14:56:43 prashant kernel: [ 1503.900700] usb 2-1.2: new full speed USB device using ehci_hcd and address 6 Apr 29 14:56:43 prashant kernel: [ 1504.172214] comedi: version 0.7.76 - http://www.comedi.org Apr 29 14:56:43 prashant kernel: [ 1504.174688] comedi: ni_usb6008: init_ni_usb6008 Apr 29 14:56:43 prashant kernel: [ 1504.174692] ni_usb6008: v2.4:Stirling/ITL USB-DUX -- Bernd.Porr@f2s.com Apr 29 14:56:43 prashant kernel: [ 1504.174708] comedi: ni_usb6008: ni_usb6008_probe Apr 29 14:56:43 prashant kernel: [ 1504.174711] comedi_: ni_usb6008_: finding a free structure for the usb-device Apr 29 14:56:43 prashant kernel: [ 1504.174959] comedi0: ni_usb6008: has been successfully initialised. Apr 29 14:56:43 prashant kernel: [ 1504.174990] usbcore: registered new interface driver ni_usb6008 Apr 29 14:56:43 prashant kernel: [ 1504.176558] comedi: ni_usb6008: ni_usb6008_firmware_request_complete_handler Apr 29 14:56:43 prashant kernel: [ 1504.176592] comedi: ni_usb6008: ni_usb6008_attach Apr 29 14:56:43 prashant kernel: [ 1504.176593] comedi0: ni_usb6008 0 is attached to comedi. Apr 29 14:56:43 prashant kernel: [ 1504.176595] comedi0: ni_usb6008: attached to ni_usb6008. Apr 29 14:56:43 prashant kernel: [ 1504.176634] comedi_: ni_usb6008_: comedi_usb_auto_config: 0 Apr 29 14:56:47 prashant kernel: [ 1508.563459] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.563466] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.563468] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.563474] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.563475] comedi: ni_usb6008: ni_usb6008_ai_cmd Apr 29 14:56:47 prashant kernel: [ 1508.563477] comedi0: ni_usb6008: sending commands to the usb device: size=8 Apr 29 14:56:47 prashant kernel: [ 1508.563478] comedi: ni_usb6008: send_dux_commands Apr 29 14:56:47 prashant kernel: [ 1508.563631] comedi: ni_usb6008: ni_usb6008_submit_InURBs Apr 29 14:56:47 prashant kernel: [ 1508.563983] comedi: ni_usb6008: ni_usb6008_ai_cancel Apr 29 14:56:47 prashant kernel: [ 1508.563985] comedi: ni_usb6008: ni_usb6008_ai_stop Apr 29 14:56:47 prashant kernel: [ 1508.563986] comedi: ni_usb6008: ni_usb6008_unlink_InURBs Apr 29 14:56:47 prashant kernel: [ 1508.573486] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.573490] comedi0: ni_usb6008: unlinking. Apr 29 14:56:47 prashant kernel: [ 1508.573492] comedi: ni_usb6008: ni_usb6008_ai_stop Apr 29 14:56:47 prashant kernel: [ 1508.573514] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.573517] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.573520] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.573524] comedi: ni_usb6008: ni_usb6008_ai_cmdtest Apr 29 14:56:47 prashant kernel: [ 1508.573526] comedi: ni_usb6008: ni_usb6008_ai_cmd Apr 29 14:56:47 prashant kernel: [ 1508.573528] comedi0: ni_usb6008: sending commands to the usb device: size=8 Apr 29 14:56:47 prashant kernel: [ 1508.573530] comedi: ni_usb6008: send_dux_commands Apr 29 14:56:47 prashant kernel: [ 1508.573750] comedi: ni_usb6008: ni_usb6008_submit_InURBs Apr 29 14:56:47 prashant kernel: [ 1508.583433] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.583435] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:47 prashant kernel: [ 1508.585428] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.585431] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:47 prashant kernel: [ 1508.587422] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.587424] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:47 prashant kernel: [ 1508.589419] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.589420] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:47 prashant kernel: [ 1508.591427] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.591430] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:47 prashant kernel: [ 1508.593412] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:47 prashant kernel: [ 1508.593414] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:47 prashant kernel: [ 1508.595412] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq .... .... .... Apr 29 14:56:51 prashant kernel: [ 1512.572562] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:51 prashant kernel: [ 1512.574550] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:51 prashant kernel: [ 1512.574552] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:51 prashant kernel: [ 1512.576550] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:51 prashant kernel: [ 1512.576551] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:51 prashant kernel: [ 1512.578543] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:51 prashant kernel: [ 1512.578545] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:51 prashant kernel: [ 1512.580543] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:51 prashant kernel: [ 1512.580545] comedi0: ni_usb6008: copying data to transfer_buffer Apr 29 14:56:51 prashant kernel: [ 1512.581218] comedi: ni_usb6008: ni_usb6008_ai_cancel Apr 29 14:56:51 prashant kernel: [ 1512.581220] comedi: ni_usb6008: ni_usb6008_ai_stop Apr 29 14:56:51 prashant kernel: [ 1512.581221] comedi: ni_usb6008: ni_usb6008_unlink_InURBs Apr 29 14:56:51 prashant kernel: [ 1512.582537] comedi: ni_usb6008: ni_usb6008_ai_IsocIrq Apr 29 14:56:51 prashant kernel: [ 1512.582539] comedi0: ni_usb6008: unlinking. Apr 29 14:56:51 prashant kernel: [ 1512.582541] comedi: ni_usb6008: ni_usb6008_ai_stop Apr 29 14:56:55 prashant kernel: [ 1515.973856] usb 2-1.2: USB disconnect, address 6 Apr 29 14:56:55 prashant kernel: [ 1515.973922] comedi: ni_usb6008: ni_usb6008_disconnect Apr 29 14:56:55 prashant kernel: [ 1515.973985] comedi_: ni_usb6008: ni_usb6008_detach Apr 29 14:56:55 prashant kernel: [ 1515.973988] comedi0: ni_usb6008: detach usb device Apr 29 14:56:55 prashant kernel: [ 1515.973991] comedi0: ni_usb6008: detach: successfully removed Apr 29 14:56:55 prashant kernel: [ 1515.974036] comedi: ni_usb6008: tidy_up Apr 29 14:56:55 prashant kernel: [ 1515.974040] comedi_: ni_usb6008: disconnected from the usb