[libhid-discuss] Find the path...

[Charles Lepple]

Strange. What kernel version are you using?

Matthias Lohr wrote:
> matthias at scripterhome:~$ sudo libhid-detach-device 04b4:0f1f
> Trying to detach HID with IDs 04b4:0f1f... done.
> matthias at scripterhome:~$ sudo lsusb -d 04b4:0f1f -vvv
> matthias at scripterhome:~$ sudo lsusb -d 04b4:0f1f -vvv
>
> Bus 001 Device 005: ID 04b4:0f1f Cypress Semiconductor Corp.
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               1.10
>   bDeviceClass            0 (Defined at Interface level)
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0         8
>   idVendor           0x04b4 Cypress Semiconductor Corp.
>   idProduct          0x0f1f
>   bcdDevice            1.10
>   iManufacturer           1 Digital Enlightenment
>   iProduct                2 Sunlight Killer
>   iSerial                 3 0000000000000532
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           41
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0x80
>       (Bus Powered)
>     MaxPower              200mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           2
>       bInterfaceClass         3 Human Interface Devices
>       bInterfaceSubClass      0 No Subclass
>       bInterfaceProtocol      0 None
>       iInterface              0
>         HID Device Descriptor:
>           bLength                 9
>           bDescriptorType        33
>           bcdHID               1.10
>           bCountryCode            0 Not supported
>           bNumDescriptors         1
>           bDescriptorType        34 Report
>           wDescriptorLength      36
>          Report Descriptors:
>            ** UNAVAILABLE **
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0021  1x 33 bytes
>         bInterval               1
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x02  EP 2 OUT
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0021  1x 33 bytes
>         bInterval               1
> Device Status:     0x0000
>   (Bus Powered)
> matthias at scripterhome:~$
>
> Look at the beginning. I have to exec lsusb two times, before i get some
> output! after the first lsusb, the usbhid driver is loaded for this
> device!
>
> Greetings
> Matthias Lohr
>
> On Wednesday 05 December 2007 14:39:59 Charles Lepple wrote:
>> That doesn't sound right. If you re-plug the device, the kernel
>> usbhid driver will claim it again, but running test_libhid (or libhid-
>> detach-device, also included in libhid) should make lsusb show the
>> descriptor.
>>
>> Are there any errors in dmesg?
>>
>> Do you have read+write permissions to the device node (in /proc/bus/
>> usb or /dev/bus/usb)?
>>
>> What does "cat /proc/bus/usb/devices" say?
>>
>> On Dec 5, 2007, at 1:28 AM, Matthias Lohr wrote:
>> > Doesn't work. lsusb seems to reload the usb driver...
>> >
>> > Matthias
>> >
>> > On Wednesday 05 December 2007 01:44:57 Charles Lepple wrote:
>> >> On Dec 4, 2007, at 7:28 PM, Peter Stuge wrote:
>> >>> On Tue, Dec 04, 2007 at 08:47:11PM +0100, Matthias Lohr wrote:
>> >>>> // lsusb
>> >>>>     Report Descriptors:
>> >>>>       ** UNAVAILABLE **
>> >>>
>> >>> Disable the HID driver to make it available.
>> >>>
>> >>> Either unload the driver or write a small program to call
>> >>> usb_detach_driver_np() in libusb, or the equivalent in libhid.
>> >>
>> >> Matthias,
>> >>
>> >> Peter is right, but by running the test program, you detached the
>> >> driver. Try running lsusb again.
>> >
>> > _______________________________________________
>> > libhid-discuss mailing list
>> > libhid-discuss at lists.alioth.debian.org
>> > http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss
>>
>> _______________________________________________
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>> libhid-discuss at lists.alioth.debian.org
>> http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss
>
>
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-- 
Charles Lepple
clepple at ghz.cc