Hi!! Currently im playing with the ds2490 USB-to-OneWire Bridge from Dallas Semiconductor and built an interface circuit. Two of this devices are working on different machines with kernel versions from 2.6.18 up to 2.6.21 perfectly.
Now one of the intended target machines (HP Omnibook xt1000s) causes Problems. It happens with the Kernelspace 1-Wire device drivers as well as with the userspace 1-Wire project owfs using libusb. Therefore i suppose it's more related to the core usb-system than to one of these projects. But i'm certainly not familiar with all this usb stuff. The error can be observed with a self compiled 2.6.21 kernel (which generated the following debuging output). But it's the same with the 2.6.18 kernel that come's with debian-testing. With usb debuging activated the dmesg output looks like this: uhci_hcd 0000:00:11.3: reserve dev 2 ep81-INT, period 1, phase 0, 36 us uhci_hcd 0000:00:11.3: release dev 2 ep81-INT, period 1, phase 0, 36 us uhci_hcd 0000:00:11.3: reserve dev 2 ep81-INT, period 1, phase 0, 36 us uhci_hcd 0000:00:11.3: release dev 2 ep81-INT, period 1, phase 0, 36 us uhci_hcd 0000:00:11.3: reserve dev 2 ep81-INT, period 1, phase 0, 36 us uhci_hcd 0000:00:11.3: release dev 2 ep81-INT, period 1, phase 0, 36 us usb 2-1: uhci_result_common: failed with status 500000 usb 2-1: owfs timed out on ep0out len=-8/0 usb 2-1: owfs timed out on ep0out len=-8/0 usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd owfs rqt 64 rq 1 len 0 ret -110 usb 2-1: owfs timed out on ep0out len=-8/0 usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd owfs rqt 64 rq 1 len 0 ret -110 usb 2-1: owfs timed out on ep0out len=-8/0 usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd owfs rqt 64 rq 1 len 0 ret -110 usb 2-1: owfs timed out on ep0out len=-8/0 usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd owfs rqt 64 rq 1 len 0 ret -110 usb 2-1: owfs timed out on ep0out len=-8/0 usb 2-1: usbfs: USBDEVFS_CONTROL failed cmd owfs rqt 64 rq 1 len 0 ret -110 After a few successful interactions on the bus, the communication fails obviously. To recover from this it's not enough to replug the device. If i don't, it looks like this: usb usb2: wakeup_rh (auto-start) hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0002 uhci_hcd 0000:00:11.3: port 1 portsc 0093,00 hub 2-0:1.0: port 1, status 0101, change 0001, 12 Mb/s hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101 usb 2-1: new full speed USB device using uhci_hcd and address 7 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: device descriptor read/64, error -110 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: device descriptor read/64, error -110 usb 2-1: new full speed USB device using uhci_hcd and address 8 usb 2-1: khubd timed out on ep0in len=-8/64 usb 2-1: khubd timed out on ep0in len=-8/64 After reloading uhci_hcd it looks like this: USB Universal Host Controller Interface driver v3.0 ACPI: PCI Interrupt 0000:00:11.2[D] -> Link [LNKD] -> GSI 10 (level, low) -> IRQ 10 uhci_hcd 0000:00:11.2: UHCI Host Controller drivers/usb/core/inode.c: creating file 'devices' drivers/usb/core/inode.c: creating file '001' uhci_hcd 0000:00:11.2: new USB bus registered, assigned bus number 1 uhci_hcd 0000:00:11.2: detected 2 ports uhci_hcd 0000:00:11.2: uhci_check_and_reset_hc: cmd = 0x0000 uhci_hcd 0000:00:11.2: Performing full reset uhci_hcd 0000:00:11.2: irq 10, io base 0x00001200 usb usb1: default language 0x0409 usb usb1: new device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: UHCI Host Controller usb usb1: Manufacturer: Linux 2.6.21kws uhci_hcd usb usb1: SerialNumber: 0000:00:11.2 usb usb1: uevent usb usb1: usb_probe_device usb usb1: configuration #1 chosen from 1 choice usb usb1: adding 1-0:1.0 (config #1, interface 0) usb 1-0:1.0: uevent hub 1-0:1.0: usb_probe_interface hub 1-0:1.0: usb_probe_interface - got id hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected hub 1-0:1.0: standalone hub hub 1-0:1.0: no power switching (usb 1.0) hub 1-0:1.0: individual port over-current protection hub 1-0:1.0: power on to power good time: 2ms hub 1-0:1.0: local power source is good hub 1-0:1.0: trying to enable port power on non-switchable hub drivers/usb/core/inode.c: creating file '001' ACPI: PCI Interrupt 0000:00:11.3[D] -> Link [LNKD] -> GSI 10 (level, low) -> IRQ 10 uhci_hcd 0000:00:11.3: UHCI Host Controller drivers/usb/core/inode.c: creating file '002' uhci_hcd 0000:00:11.3: new USB bus registered, assigned bus number 2 uhci_hcd 0000:00:11.3: detected 2 ports uhci_hcd 0000:00:11.3: uhci_check_and_reset_hc: cmd = 0x0000 uhci_hcd 0000:00:11.3: Performing full reset uhci_hcd 0000:00:11.3: irq 10, io base 0x00001300 usb usb2: default language 0x0409 usb usb2: new device strings: Mfr=3, Product=2, SerialNumber=1 usb usb2: Product: UHCI Host Controller usb usb2: Manufacturer: Linux 2.6.21kws uhci_hcd usb usb2: SerialNumber: 0000:00:11.3 usb usb2: uevent usb usb2: usb_probe_device usb usb2: configuration #1 chosen from 1 choice usb usb2: adding 2-0:1.0 (config #1, interface 0) usb 2-0:1.0: uevent hub 2-0:1.0: usb_probe_interface hub 2-0:1.0: usb_probe_interface - got id hub 2-0:1.0: USB hub found hub 2-0:1.0: 2 ports detected hub 2-0:1.0: standalone hub hub 2-0:1.0: no power switching (usb 1.0) hub 2-0:1.0: individual port over-current protection hub 2-0:1.0: power on to power good time: 2ms hub 2-0:1.0: local power source is good hub 2-0:1.0: trying to enable port power on non-switchable hub hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0006 uhci_hcd 0000:00:11.2: port 1 portsc 018a,00 hub 1-0:1.0: port 1, status 0300, change 0003, 1.5 Mb/s drivers/usb/core/inode.c: creating file '001' hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x300 uhci_hcd 0000:00:11.2: port 2 portsc 008a,00 hub 1-0:1.0: port 2, status 0100, change 0003, 12 Mb/s hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100 hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0006 uhci_hcd 0000:00:11.3: port 1 portsc 008a,00 hub 2-0:1.0: port 1, status 0100, change 0003, 12 Mb/s hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x100 uhci_hcd 0000:00:11.3: port 2 portsc 018a,00 hub 2-0:1.0: port 2, status 0300, change 0003, 1.5 Mb/s hub 2-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x300 hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000 usb usb1: suspend_rh (auto-stop) usb usb2: suspend_rh (auto-stop) usb usb2: wakeup_rh (auto-start) hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0002 uhci_hcd 0000:00:11.3: port 1 portsc 0093,00 hub 2-0:1.0: port 1, status 0101, change 0001, 12 Mb/s hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101 usb 2-1: new full speed USB device using uhci_hcd and address 2 usb 2-1: ep0 maxpacket = 8 usb 2-1: new device strings: Mfr=0, Product=0, SerialNumber=0 usb 2-1: uevent usb 2-1: usb_probe_device usb 2-1: configuration #1 chosen from 1 choice usb 2-1: adding 2-1:1.0 (config #1, interface 0) usb 2-1:1.0: uevent drivers/usb/core/inode.c: creating file '002' hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0002 and everything can be repeated from start. I must mention that several other USB devices are working flawlessly on this notebook as well as this 1-wire bridge device is working perfectly on several other computers. It's apparently only this combination which makes problems. Even more curious: As soon as the bridge-device is connected via a USB-hub (without external power supply) it works too! Of course this would be a work around but it's quite unsatisfying. AND: The failure can be reproduced with another of these bridge devices which is using the same chipset (ds2490) but another surrounding circuit design. So it's unlikely that it's an electrical problem. I'm a bit helpless at the moment. Thank you in advance, kind regards, Klaus ------------------------------------------------------------------------- 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. 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