Re: Writing a rule specific to a USB connector

[Tom Gundersen <teg@xxxxxxx>]

On Tue, Aug 23, 2011 at 12:45 PM, Diego Iastrubni <diegoiast@xxxxxxxxx> wrote:
> On Tue, Aug 23, 2011 at 12:51 PM, Tom Gundersen <teg@xxxxxxx> wrote:
>> I guess c1ca is not the idVendor of your hidraw device, but of one of
>> it its parents. Could you post the output of "udevadm info --query=all
>> --name=/dev/hidraw0 --attribute-walk" (without the egrep)?
>
> [/root 10.10.10.44] $ udevadm info --query=all --name=/dev/hidraw0
> --attribute-walk

[...]

>  looking at device
> '/devices/platform/musb_hdrc/usb1/1-1/1-1.1/1-1.1:1.0/0003:C1CA:0003.0001/hidraw/hidraw0':
>    KERNEL=="hidraw0"
>    SUBSYSTEM=="hidraw"
>    DRIVER==""

[...]

>  looking at parent device '/devices/platform/musb_hdrc/usb1/1-1/1-1.1':
>    KERNELS=="1-1.1"
>    SUBSYSTEMS=="usb"
>    DRIVERS=="usb"
>    ATTRS{configuration}=="Default configuration"
>    ATTRS{bNumInterfaces}==" 1"
>    ATTRS{bConfigurationValue}=="1"
>    ATTRS{bmAttributes}=="40"
>    ATTRS{bMaxPower}=="  0mA"
>    ATTRS{urbnum}=="41"
>    ATTRS{idVendor}=="c1ca"
>    ATTRS{idProduct}=="0003"
>    ATTRS{bcdDevice}=="0000"
>    ATTRS{bDeviceClass}=="00"
>    ATTRS{bDeviceSubClass}=="00"
>    ATTRS{bDeviceProtocol}=="00"
>    ATTRS{bNumConfigurations}=="1"
>    ATTRS{bMaxPacketSize0}=="8"
>    ATTRS{speed}=="12"
>    ATTRS{busnum}=="1"
>    ATTRS{devnum}=="3"
>    ATTRS{devpath}=="1.1"
>    ATTRS{version}==" 1.01"
>    ATTRS{maxchild}=="0"
>    ATTRS{quirks}=="0x0"
>    ATTRS{authorized}=="1"
>    ATTRS{manufacturer}=="Sysmop tech."
>    ATTRS{product}=="USB PALM"

[...]

>  looking at parent device '/devices/platform/musb_hdrc/usb1':
>    KERNELS=="usb1"
>    SUBSYSTEMS=="usb"
>    DRIVERS=="usb"
>    ATTRS{configuration}==""
>    ATTRS{bNumInterfaces}==" 1"
>    ATTRS{bConfigurationValue}=="1"
>    ATTRS{bmAttributes}=="e0"
>    ATTRS{bMaxPower}=="  0mA"
>    ATTRS{urbnum}=="26"
>    ATTRS{idVendor}=="1d6b"
>    ATTRS{idProduct}=="0002"
>    ATTRS{bcdDevice}=="0206"
>    ATTRS{bDeviceClass}=="09"
>    ATTRS{bDeviceSubClass}=="00"
>    ATTRS{bDeviceProtocol}=="00"
>    ATTRS{bNumConfigurations}=="1"
>    ATTRS{bMaxPacketSize0}=="64"
>    ATTRS{speed}=="480"
>    ATTRS{busnum}=="1"
>    ATTRS{devnum}=="1"
>    ATTRS{devpath}=="0"
>    ATTRS{version}==" 2.00"
>    ATTRS{maxchild}=="1"
>    ATTRS{quirks}=="0x0"
>    ATTRS{authorized}=="1"
>    ATTRS{manufacturer}=="Linux 2.6.32 musb-hcd"
>    ATTRS{product}=="MUSB HDRC host driver"
>    ATTRS{serial}=="musb_hdrc"
>    ATTRS{authorized_default}=="1"

Ok, so that explains why you don't get your 11111 symlink, the
idVendor you are matching against is not on the device you want, but
on a parent.

I honestly don't know the best way to match against two different
parents, which is apparently what you need. I guess something like
this should work though:

SUBSYSTEM!="hidraw", GOTO="hidraw_end"
ATTRS{idVendor}!="c1ca", GOTO="hidraw_end"
ATTRS{serial}=="musb_hdrc", SYMLINK+="444444"
LABEL="hidraw_end"

Maybe someone else knows a better solution?

Cheers,

Tom
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