Ownership of usb device with udev.

[Guillaume Yziquel]

Werner Koch a écrit :
> On Fri, 29 Jun 2007 11:38, guillaume.yziquel at free.fr said:
> 
>> Visibly, purging pcscd does not solve the problem. Concerning
>> permissions, I guess I have some work to do:
> 
> Indeed.  That is your problem.  Use lsusb to figure out where the SCR335
> is attached and the manually update the ownership for testing.  The
> HOWTO has hints on how to install the hotplug stuff.

I read the hotplug stuff was deprecated, and that udev should be used
instead. The output of lsusb -v concerning the smart card reader follows.

My main problem is that I do not really understand how udev works. I
understood there was lots of renaming involved. And with all these
renamings, I do not really know how to make ownership changes.

I'd really love to find a good document on how udev works. In particular
with debian.

Thank you.

Guillaume Yziquel.

> Bus 003 Device 003: ID 04e6:5115 SCM Microsystems, Inc. SCR335 SmartCard Reader
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass            0 (Defined at Interface level)
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0        16
>   idVendor           0x04e6 SCM Microsystems, Inc.
>   idProduct          0x5115 SCR335 SmartCard Reader
>   bcdDevice            5.18
>   iManufacturer           1 SCM Microsystems Inc.
>   iProduct                2 SCR33x USB Smart Card Reader
>   iSerial                 5 21120706318555
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           93
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          3 CCID Class
>     bmAttributes         0xa0
>       (Bus Powered)
>       Remote Wakeup
>     MaxPower              100mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           3
>       bInterfaceClass        11 Chip/SmartCard
>       bInterfaceSubClass      0
>       bInterfaceProtocol      0
>       iInterface              4 CCID Interface
>       ChipCard Interface Descriptor:
>         bLength                54
>         bDescriptorType        33
>         bcdCCID              1.00
>         nMaxSlotIndex           0
>         bVoltageSupport         1  5.0V
>         dwProtocols             3  T=0 T=1
>         dwDefaultClock       4000
>         dwMaxiumumClock     12000
>         bNumClockSupported      0
>         dwDataRate           9600 bps
>         dwMaxDataRate      307200 bps
>         bNumDataRatesSupp.      0
>         dwMaxIFSD             252
>         dwSyncProtocols  00000000
>         dwMechanical     00000000
>         dwFeatures       000100BA
>           Auto configuration based on ATR
>           Auto voltage selection
>           Auto clock change
>           Auto baud rate change
>           Auto PPS made by CCID
>           TPDU level exchange
>         dwMaxCCIDMsgLen       263
>         bClassGetResponse    echo
>         bClassEnvelope       echo
>         wlcdLayout           none
>         bPINSupport             0
>         bMaxCCIDBusySlots       1
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x01  EP 1 OUT
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0040  1x 64 bytes
>         bInterval               0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x82  EP 2 IN
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0040  1x 64 bytes
>         bInterval               0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x83  EP 3 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0010  1x 16 bytes
>         bInterval              16
> Device Status:     0x0000
>   (Bus Powered)