Hi, I'm stuck on a project and I wondered if any of you kind chaps might be able to help? (platform = kernel 2.4.16 using usb-uhci)
I'm writing a device driver (GPL) for the PrimaScan icam320 webcam (based on the existing driver for dabusb). I'm using sniffusb 0.13 to intercept the windows<->webcam. I've got the device registered, probed and initialised by sending the same control messages logged by sniff usb. Now problems or errors until now. Question 1. I'm submitting the ISO tranfer URBs which are all coming back (via completion handler) with the correct number of packets - but they are all empty. No errors, status is fine, frame count is increasing as expected ... just no data. What's the best way to prove 100% that they're coming from the webcam? I'll happily patch the kernel to output extra diagnostics if necessary... Any suggestions? Example hexdump from received packet data: 000000 00ff 0000 0000 0000 0000 0000 0000 0000 000010 0000 0000 0000 0000 0000 0000 0000 0000 * 000380 00ff 0000 0000 0000 0000 0000 0000 0000 000390 0000 0000 0000 0000 0000 0000 0000 0000 * 000700 00ff 0000 0000 0000 0000 0000 0000 0000 000710 0000 0000 0000 0000 0000 0000 0000 0000 * 000a80 00ff 0000 0000 0000 0000 0000 0000 0000 000a90 0000 0000 0000 0000 0000 0000 0000 0000 * 000e00 00ff 0000 0000 0000 0000 0000 0000 0000 000e10 0000 0000 0000 0000 0000 0000 0000 0000 * 001180 00ff 0000 0000 0000 0000 0000 0000 0000 001190 0000 0000 0000 0000 0000 0000 0000 0000 Question 2. Before the URB is passed to the completion handler, the urb->dev field is being nullified. What's the rational behind this? It causes dabusb.c to oops when calling "unsigned int pipe = usb_rcvisocpipe (purb->dev, _DABUSB_ISOPIPE);" Anyone else noticed this? Look like the driver in 2.4.16 is broke an no one noticed. Question 3. SniffUSB starts the logfile with the output below, am I correct in assuming that this is the same as... usb_set_configuration (usbdev, usbdev->config[0].bConfigurationValue) and usb_set_interface (s->usbdev, 0, 6); UsbSnoop - IRP_MJ_INTERNAL_DEVICE_CONTROL, IOCTL_INTERNAL_USB_SUBMIT_URB >>>>>>>URB 782 going down... -- URB_FUNCTION_SELECT_INTERFACE: !!! Hdr.Length is wrong! (is: 32, should be at least: 56) ConfigurationHandle = 0xc2a122c0 Interface: Length = 0x00000024 Interface: InterfaceNumber = 0x00 Interface: AlternateSetting = 0x06 Interface: Class = 0xff Interface: SubClass = 0x00 Interface: Protocol = 0x00 Interface: InterfaceHandle = 0xcc5ed5f0 Interface: NumberOfPipes = 0x00000001 <<<<<<< URB 782 coming back... -- URB_FUNCTION_SELECT_INTERFACE: !!! Hdr.Length is wrong! (is: 32, should be at least: 56) ConfigurationHandle = 0xc2a122c0 Interface: Length = 0x00000024 Interface: InterfaceNumber = 0x00 Interface: AlternateSetting = 0x06 Interface: Class = 0xff Interface: SubClass = 0x00 Interface: Protocol = 0x00 Interface: InterfaceHandle = 0xcc5e9d80 Interface: NumberOfPipes = 0x00000001 Interface: Pipes[0] : MaximumPacketSize = 0x0380 Interface: Pipes[0] : EndpointAddress = 0x81 Interface: Pipes[0] : Interval = 0x01 Interface: Pipes[0] : PipeType = 0x01 (UsbdPipeTypeIsochronous) Interface: Pipes[0] : PipeHandle = 0xcc5e9d98 Interface: Pipes[0] : MaxTransferSize = 0x00008000 Interface: Pipes[0] : PipeFlags = 0x00 UsbSnoop - IRP_MJ_INTERNAL_DEVICE_CONTROL, IOCTL_INTERNAL_USB_SUBMIT_URB I know you're all busy but any advise/comments would be very welcome. Thanks again, Steve _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
