Re: [Libusb-devel] libusb silently ignores permission errors

On 9/23/07, Alan Stern <[email protected]> wrote:
> On Sun, 23 Sep 2007, Xiaofan Chen wrote:
>
> > Add linux-usb-devel in CC. Hopefully this is ok.
> > Problem: USBview can see the device but not libusb/lsusb.
>
> > Hmm, I built a new kernel 2.6.22.7 from kernel.org and the problem
> > remains. So maybe this is still a libusb/lsusb problem. I will dig further.
> >
> > For lsusb replacement, I think a console version of usbview will do.
> > However I can not get the bootloader host application to work
> > since libusb does not see the device.
> >
> > mcuee@mcuee-desktop:~$ uname -a
> > Linux mcuee-desktop 2.6.22.7 #1 SMP Sat Sep 22 22:40:02 SGT 2007 i686 GNU/Linux
>
> Try building a kernel with CONFIG_USB_SUSPEND disabled.
>

Ah this is the key. Now it is ok, I believe the firmware does not adequately
handle USB suspend. I am still investigating how to handle USB suspend
correctly by changing the Microchip provided firmware framework.
http://forum.microchip.com/tm.aspx?m=275422

Could you explain what happend to lsusb why it failed to find the device in
the case that  CONFIG_USB_SUSPEND is enabled? Thanks in advance.

mcuee@mcuee-desktop:~/Desktop/build/fsusb/fsusb-0.1.11-2$ ./fsusb
--read test.hex
Locating USB Microchip(tm) PICDEM-FS USB(tm) (vendor 0x04d8/product 0x000b)
Found USB PICDEM-FS USB as device '004' on USB bus 002
Communication established.  Onboard firmware version is 1.0
Finished reading

mcuee@mcuee-desktop:~/Desktop/build/fsusb/fsusb-0.1.11-2$ lsusb
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 004: ID 04d8:000b Microchip Technology, Inc.
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

Related dmesg output after plugging in and running the last two command.
mcuee@mcuee-desktop:~/Desktop/build/fsusb/fsusb-0.1.11-2$ dmesg
... <skipped>...
[  604.316000] hub 3-0:1.0: state 7 ports 8 chg 0000 evt 0100
[  604.316000] ehci_hcd 0000:00:02.2: GetStatus port 8 status 001803
POWER sig=j CSC CONNECT
[  604.316000] hub 3-0:1.0: port 8, status 0501, change 0001, 480 Mb/s
[  604.444000] hub 3-0:1.0: debounce: port 8: total 100ms stable 100ms
status 0x501
[  604.500000] ehci_hcd 0000:00:02.2: port 8 full speed --> companion
[  604.500000] ehci_hcd 0000:00:02.2: GetStatus port 8 status 003001
POWER OWNER sig=se0 CONNECT
[  604.500000] ohci_hcd 0000:00:02.1: auto-wakeup root hub
[  604.500000] hub 3-0:1.0: port 8 not reset yet, waiting 50ms
[  604.556000] ehci_hcd 0000:00:02.2: GetStatus port 8 status 003802
POWER OWNER sig=j CSC
[  604.556000] hub 2-0:1.0: state 7 ports 4 chg 0000 evt 0010
[  604.556000] ohci_hcd 0000:00:02.1: GetStatus roothub.portstatus [3]
= 0x00010101 CSC PPS CCS
[  604.556000] hub 2-0:1.0: port 4, status 0101, change 0001, 12 Mb/s
[  604.684000] hub 2-0:1.0: debounce: port 4: total 100ms stable 100ms
status 0x101
[  604.756000] ohci_hcd 0000:00:02.1: GetStatus roothub.portstatus [3]
= 0x00100103 PRSC PPS PES CCS
[  604.812000] usb 2-4: new full speed USB device using ohci_hcd and address 4
[  604.884000] ohci_hcd 0000:00:02.1: GetStatus roothub.portstatus [3]
= 0x00100103 PRSC PPS PES CCS
[  604.960000] usb 2-4: ep0 maxpacket = 8
[  604.976000] usb 2-4: new device strings: Mfr=0, Product=0, SerialNumber=0
[  604.976000] DEV: registering device: ID = '2-4'
[  604.976000] PM: Adding info for usb:2-4
[  604.976000] bus usb: add device 2-4
[  604.976000] usb 2-4: uevent
[  604.976000] usb: Matched Device 2-4 with Driver usb
[  604.976000] usb: Probing driver usb with device 2-4
[  604.976000] usb 2-4: usb_probe_device
[  604.976000] DEV: registering device: ID = 'usbdev2.4_ep00'
[  604.976000] PM: Adding info for No Bus:usbdev2.4_ep00
[  604.976000] usb 2-4: configuration #1 chosen from 1 choice
[  604.980000] usb 2-4: adding 2-4:1.0 (config #1, interface 0)
[  604.980000] DEV: registering device: ID = '2-4:1.0'
[  604.980000] PM: Adding info for usb:2-4:1.0
[  604.980000] bus usb: add device 2-4:1.0
[  604.980000] usb 2-4:1.0: uevent
[  604.980000] usb 2-4:1.0: uevent
[  604.980000] DEV: registering device: ID = 'usbdev2.4_ep01'
[  604.980000] PM: Adding info for No Bus:usbdev2.4_ep01
[  604.980000] DEV: registering device: ID = 'usbdev2.4_ep81'
[  604.980000] PM: Adding info for No Bus:usbdev2.4_ep81
[  604.980000] DEV: registering device: ID = 'usbdev2.4'
[  604.980000] PM: Adding info for No Bus:usbdev2.4
[  604.980000] drivers/usb/core/inode.c: creating file '004'
[  604.980000] bound device '2-4' to driver 'usb'
[  604.980000] usb: Bound Device 2-4 to Driver usb
[  604.980000] hub 3-0:1.0: state 7 ports 8 chg 0000 evt 0100
[  604.980000] hub 2-0:1.0: state 7 ports 4 chg 0000 evt 0010
[  744.436000] DEV: Unregistering device. ID = 'usbdev2.4_ep01'
[  744.436000] PM: Removing info for No Bus:usbdev2.4_ep01
[  744.436000] usb_endpoint usbdev2.4_ep01: ep_device_release called
for usbdev2.4_ep01
[  744.436000] DEV: Unregistering device. ID = 'usbdev2.4_ep81'
[  744.436000] PM: Removing info for No Bus:usbdev2.4_ep81
[  744.436000] usb_endpoint usbdev2.4_ep81: ep_device_release called
for usbdev2.4_ep81
[  744.436000] DEV: registering device: ID = 'usbdev2.4_ep01'
[  744.440000] PM: Adding info for No Bus:usbdev2.4_ep01
[  744.440000] DEV: registering device: ID = 'usbdev2.4_ep81'
[  744.440000] PM: Adding info for No Bus:usbdev2.4_ep81
[  744.440000] bound device '2-4:1.0' to driver 'usbfs'
[  755.472000] usb 2-4: manual set_interface for iface 0, alt 0
[  755.472000] DEV: Unregistering device. ID = 'usbdev2.4_ep01'
[  755.472000] PM: Removing info for No Bus:usbdev2.4_ep01
[  755.472000] usb_endpoint usbdev2.4_ep01: ep_device_release called
for usbdev2.4_ep01
[  755.472000] DEV: Unregistering device. ID = 'usbdev2.4_ep81'
[  755.472000] PM: Removing info for No Bus:usbdev2.4_ep81
[  755.472000] usb_endpoint usbdev2.4_ep81: ep_device_release called
for usbdev2.4_ep81
[  755.476000] DEV: registering device: ID = 'usbdev2.4_ep01'
[  755.476000] PM: Adding info for No Bus:usbdev2.4_ep01
[  755.476000] DEV: registering device: ID = 'usbdev2.4_ep81'
[  755.476000] PM: Adding info for No Bus:usbdev2.4_ep81

Regards,
Xiaofan

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