MODALIAS to stay

MODALIAS to stay

[Andreas Jellinghaus]

I have udev rules lines like this:
SYSFS{idVendor}="0973", SYSFS{idProduct}="0001", RUN+="/lib/udev/openct_usb"
and
SYSFS{bInterfaceClass}="0b", SYSFS{bInterfaceSubClass}="00", 
SYSFS{bInterfaceProtocol}="00" RUN+="/lib/udev/openct_usb"

Now I see the kernel has a MODALIAS line that contains all the information I 
need. "usb:v0973p0001*" or "usb:*ic0Bisc00*" would match the same way as 
using sysfs. 

So I wonder: can I match MODALIAS like this somehow in udev rules? 
and is there any reason not to use MODALIAS?

as far as I know the kernel creates the MODALIAS line in 
drivers/usb/core/driver.c so I guess it is always part of an event and thus 
shouldn't have any timing problem, right?

Thanks for your help.

Regards, Andreas

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Re: MODALIAS to stay

[Kay Sievers]

On 7/10/07, Andreas Jellinghaus <aj@dungeon.inka.de> wrote:
> I have udev rules lines like this:
> SYSFS{idVendor}="0973", SYSFS{idProduct}="0001", RUN+="/lib/udev/openct_usb"
> and
> SYSFS{bInterfaceClass}="0b", SYSFS{bInterfaceSubClass}="00",
> SYSFS{bInterfaceProtocol}="00" RUN+="/lib/udev/openct_usb"
>
> Now I see the kernel has a MODALIAS line that contains all the information I
> need. "usb:v0973p0001*" or "usb:*ic0Bisc00*" would match the same way as
> using sysfs.
>
> So I wonder: can I match MODALIAS like this somehow in udev rules?

ENV{MODALIAS}="usb:v0973p0001*|usb:*ic0Bisc00*" should match.

> and is there any reason not to use MODALIAS?

No, it should be fine.

> as far as I know the kernel creates the MODALIAS line in
> drivers/usb/core/driver.c so I guess it is always part of an event and thus
> shouldn't have any timing problem, right?

It should always be in the environment, yes.

Kay

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Re: MODALIAS to stay

[Andreas Jellinghaus]

Kay Sievers wrote:
>> So I wonder: can I match MODALIAS like this somehow in udev rules?
> 
> ENV{MODALIAS}="usb:v0973p0001*|usb:*ic0Bisc00*" should match.

ok, thanks.

> It should always be in the environment, yes.

thanks, will rewrite my rules file to use this instead of sysfs.

Regards, Andreas


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