I'm working with two digital cameras - a Sanyo Xacti S1 and a Canon PowerShot A80 - and I'm writing an application to talk to them which uses libusb. Each DSC advertises that the maximum bytecount per transfer on the interrupt endpoint is 8 bytes, so I only read a maximum of 8 bytes at a time from the interrupt endpoint, even though the higher level protocol (PTP) usually sends a total of 16 bytes in a "logical interrupt".
Having hooked up a USB analyzer between the camera and my Linux system, I see interrupt data on the scope, but I don't always see the data when I read the interrupt endpoint. I've enabled debug in USB for this kernel, and I've cruised the source a little in core/urb.c and core/message.c, but I'm not sure of the best place to add a printk() or two (or otherwise enable more debug output) to see if the interrupt data I'm looking for is being seen by the kernel. Below is the output of dmesg from when I fire up my application and turn on the camera until I turn off the camera. Note that the "USBDEVFS_BULK failed" messages are instances of timeouts on reads to the interrupt endpoint. What you don't see here (because dmesg doesn't include it) is lots of successful I/O to and from the input, output, and interrupt endpoints. Suggestions? What other information would be useful? Thanks, -Del >From dmesg: drivers/usb/host/uhci-hcd.c: 1060: wakeup_hc hub 1-0:1.0: port 2, status 101, change 1, 12 Mb/s hub 1-0:1.0: debounce: port 2: delay 100ms stable 4 status 0x101 hub 1-0:1.0: new USB device on port 2, assigned address 13 usb 1-2: new device strings: Mfr=1, Product=2, SerialNumber=3 drivers/usb/core/message.c: USB device number 13 default language ID 0x409 usb 1-2: Product: SANYO Digital Camera usb 1-2: Manufacturer: SANYO usb 1-2: SerialNumber: 000068951222 drivers/usb/core/usb.c: usb_hotplug usb 1-2: registering 1-2:1.0 (config #1, interface 0) drivers/usb/core/usb.c: usb_hotplug drivers/usb/core/usb.c: usbfs driver claimed interface cf9f3d80 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 usb 1-2: bulk timeout on ep1in usbfs: USBDEVFS_BULK failed dev 13 ep 0x81 len 8 ret -110 hub 1-0:1.0: port 2, status 100, change 3, 12 Mb/s usb 1-2: USB disconnect, address 13 usb 1-2: usb_disable_device nuking all URBs usb 1-2: unregistering interface 1-2:1.0 drivers/usb/core/usb.c: usb_hotplug usb 1-2: unregistering device drivers/usb/core/usb.c: usb_hotplug updfstab: numerical sysctl 1 23 is obsolete. hub 1-0:1.0: port 2 enable change, status 100 drivers/usb/host/uhci-hcd.c: 1060: suspend_hc >From linux-2.6.0-test9/.config: 131 lines matching "usb" in buffer .config. 1106:CONFIG_USB_IRDA=m 1130:CONFIG_BT_HCIUSB=m 1131:CONFIG_BT_USB_SCO=y 1132:# CONFIG_BT_USB_ZERO_PACKET is not set 1426:CONFIG_VIDEO_CPIA_USB=m 1534:# USB support 1536:CONFIG_USB=m 1537:CONFIG_USB_DEBUG=y 1540:# Miscellaneous USB options 1542:CONFIG_USB_DEVICEFS=y 1543:# CONFIG_USB_BANDWIDTH is not set 1544:# CONFIG_USB_DYNAMIC_MINORS is not set 1547:# USB Host Controller Drivers 1549:CONFIG_USB_EHCI_HCD=m 1550:# CONFIG_USB_OHCI_HCD is not set 1551:CONFIG_USB_UHCI_HCD=m 1554:# USB Device Class drivers 1556:CONFIG_USB_AUDIO=m 1559:# USB Bluetooth TTY can only be used with disabled Bluetooth subsystem 1561:CONFIG_USB_MIDI=m 1562:CONFIG_USB_ACM=m 1563:CONFIG_USB_PRINTER=m 1564:CONFIG_USB_STORAGE=m 1565:CONFIG_USB_STORAGE_DEBUG=y 1566:CONFIG_USB_STORAGE_DATAFAB=y 1567:CONFIG_USB_STORAGE_FREECOM=y 1568:CONFIG_USB_STORAGE_ISD200=y 1569:CONFIG_USB_STORAGE_DPCM=y 1570:CONFIG_USB_STORAGE_HP8200e=y 1571:CONFIG_USB_STORAGE_SDDR09=y 1572:CONFIG_USB_STORAGE_SDDR55=y 1573:CONFIG_USB_STORAGE_JUMPSHOT=y 1576:# USB Human Interface Devices (HID) 1578:CONFIG_USB_HID=m 1579:CONFIG_USB_HIDINPUT=y 1581:CONFIG_USB_HIDDEV=y 1584:# USB HID Boot Protocol drivers 1586:# CONFIG_USB_KBD is not set 1587:# CONFIG_USB_MOUSE is not set 1588:CONFIG_USB_AIPTEK=m 1589:CONFIG_USB_WACOM=m 1590:CONFIG_USB_KBTAB=m 1591:CONFIG_USB_POWERMATE=m 1592:# CONFIG_USB_XPAD is not set 1595:# USB Imaging devices 1597:CONFIG_USB_MDC800=m 1598:CONFIG_USB_SCANNER=m 1599:CONFIG_USB_MICROTEK=m 1600:CONFIG_USB_HPUSBSCSI=m 1603:# USB Multimedia devices 1605:CONFIG_USB_DABUSB=m 1606:CONFIG_USB_VICAM=m 1607:CONFIG_USB_DSBR=m 1608:CONFIG_USB_IBMCAM=m 1609:CONFIG_USB_KONICAWC=m 1610:CONFIG_USB_OV511=m 1611:CONFIG_USB_PWC=m 1612:CONFIG_USB_SE401=m 1613:CONFIG_USB_STV680=m 1616:# USB Network adaptors 1618:CONFIG_USB_CATC=m 1619:CONFIG_USB_KAWETH=m 1620:CONFIG_USB_PEGASUS=m 1621:CONFIG_USB_RTL8150=m 1622:CONFIG_USB_USBNET=m 1625:# USB Host-to-Host Cables 1627:CONFIG_USB_AN2720=y 1628:CONFIG_USB_BELKIN=y 1629:CONFIG_USB_GENESYS=y 1630:CONFIG_USB_NET1080=y 1631:CONFIG_USB_PL2301=y 1634:# Intelligent USB Devices/Gadgets 1636:CONFIG_USB_ARMLINUX=y 1637:CONFIG_USB_EPSON2888=y 1638:CONFIG_USB_ZAURUS=y 1639:CONFIG_USB_CDCETHER=y 1642:# USB Network Adapters 1644:# CONFIG_USB_AX8817X is not set 1647:# USB port drivers 1649:CONFIG_USB_USS720=m 1652:# USB Serial Converter support 1654:CONFIG_USB_SERIAL=m 1655:CONFIG_USB_SERIAL_GENERIC=y 1656:CONFIG_USB_SERIAL_BELKIN=m 1657:CONFIG_USB_SERIAL_WHITEHEAT=m 1658:CONFIG_USB_SERIAL_DIGI_ACCELEPORT=m 1659:CONFIG_USB_SERIAL_EMPEG=m 1660:CONFIG_USB_SERIAL_FTDI_SIO=m 1661:CONFIG_USB_SERIAL_VISOR=m 1662:CONFIG_USB_SERIAL_IPAQ=m 1663:CONFIG_USB_SERIAL_IR=m 1664:CONFIG_USB_SERIAL_EDGEPORT=m 1665:CONFIG_USB_SERIAL_EDGEPORT_TI=m 1666:CONFIG_USB_SERIAL_KEYSPAN_PDA=m 1667:CONFIG_USB_SERIAL_KEYSPAN=m 1668:CONFIG_USB_SERIAL_KEYSPAN_MPR=y 1669:# CONFIG_USB_SERIAL_KEYSPAN_USA28 is not set 1670:# CONFIG_USB_SERIAL_KEYSPAN_USA28X is not set 1671:CONFIG_USB_SERIAL_KEYSPAN_USA28XA=y 1672:CONFIG_USB_SERIAL_KEYSPAN_USA28XB=y 1673:# CONFIG_USB_SERIAL_KEYSPAN_USA19 is not set 1674:# CONFIG_USB_SERIAL_KEYSPAN_USA18X is not set 1675:CONFIG_USB_SERIAL_KEYSPAN_USA19W=y 1676:CONFIG_USB_SERIAL_KEYSPAN_USA19QW=y 1677:CONFIG_USB_SERIAL_KEYSPAN_USA19QI=y 1678:CONFIG_USB_SERIAL_KEYSPAN_USA49W=y 1679:CONFIG_USB_SERIAL_KEYSPAN_USA49WLC=y 1680:CONFIG_USB_SERIAL_KLSI=m 1681:CONFIG_USB_SERIAL_KOBIL_SCT=m 1682:CONFIG_USB_SERIAL_MCT_U232=m 1683:CONFIG_USB_SERIAL_PL2303=m 1684:CONFIG_USB_SERIAL_SAFE=m 1685:# CONFIG_USB_SERIAL_SAFE_PADDED is not set 1686:CONFIG_USB_SERIAL_CYBERJACK=m 1687:CONFIG_USB_SERIAL_XIRCOM=m 1688:CONFIG_USB_SERIAL_OMNINET=m 1689:CONFIG_USB_EZUSB=y 1692:# USB Miscellaneous drivers 1694:# CONFIG_USB_EMI26 is not set 1695:CONFIG_USB_TIGL=m 1696:CONFIG_USB_AUERSWALD=m 1697:CONFIG_USB_RIO500=m 1698:CONFIG_USB_BRLVGER=m 1699:CONFIG_USB_LCD=m 1700:# CONFIG_USB_SPEEDTOUCH is not set 1701:CONFIG_USB_TEST=m 1702:CONFIG_USB_GADGET=y 1703:# CONFIG_USB_NET2280 is not set 1704:# CONFIG_USB_ZERO is not set 1705:# CONFIG_USB_ETH is not set 1706:# CONFIG_USB_GADGETFS is not set ------------------------------------------------------- This SF.Net email sponsored by: ApacheCon 2003, 16-19 November in Las Vegas. 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