Is this the official hotplug ?

Is this the official hotplug ?

[Matts Kivik]

I have seen there is also a hotplug deamon called usbmgr.

Is any of theese the official one ?
Clearly there is only room for one, unless they are somewhat compatible, as a developer I cant develop hotplug features for more than one hotplug handler for my piece of usb hotplug device.


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Re: Is this the official hotplug ?

[David Brownell]

"Matts Kivik"  wrote:

> I have seen there is also a hotplug deamon called usbmgr.
> 
> Is any of theese the official one ?

Well, only the /sbin/hotplug mechanism is actually called "hotplug"
and has direct kernel support.  It's referenced in the kernel
config help for CONFIG_HOTPLUG.  All in all, I think it
has more of a claim to being "official" than "usbmgr".

Actually a key part of the idea was to get away from the need to
have an extra daemon running all the time, consuming system
resources.

- Dave

> Clearly there is only room for one, unless they are somewhat compatible, as a
> developer I cant develop hotplug features for more than one hotplug handler
> for my piece of usb hotplug device.
> 



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Re: Is this the official hotplug ?

[Matts Kivik]

Thanks for your answer. Do you know where I can find information on what happens when I plug a device to the usb port. I can see that /proc/bus/usb/devices gets information on my device. Now I would like to start a program, or script when this happens (ONLY when a certain device is inserted), how shall I do that, (on a standard production pre compiled generally distrubuted kernel (Mandrake/RedHat....)).

--- David Brownell <david-b@pacbell.net>
> wrote:
>"Matts Kivik"  wrote:
>
>> I have seen there is also a hotplug deamon called usbmgr.
>> 
>> Is any of theese the official one ?
>
>Well, only the /sbin/hotplug mechanism is actually called "hotplug"
>and has direct kernel support.  It's referenced in the kernel
>config help for CONFIG_HOTPLUG.  All in all, I think it
>has more of a claim to being "official" than "usbmgr".
>
>Actually a key part of the idea was to get away from the need to
>have an extra daemon running all the time, consuming system
>resources.
>
>- Dave
>
>> Clearly there is only room for one, unless they are somewhat compatible, as a
>> developer I cant develop hotplug features for more than one hotplug handler
>> for my piece of usb hotplug device.
>> 
>
>
>
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>Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
>Linux-hotplug-devel@lists.sourceforge.net
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Re: Is this the official hotplug ?

[David Brownell]

> Thanks for your answer. Do you know where I can find information
> on what happens when I plug a device to the usb port.

Some is at http://linux-hotplug.sourceforge.net/?selected=usb
but that's just focussing on the hotplug-related stuff, not
describing usbdevfs or how the kernel manages enumeration.


> I can see that /proc/bus/usb/devices gets information on my device. 

Good, the kernel didn't have problems enumerating it.


>    Now I
> would like to start a program, or script when this happens (ONLY
> when a certain device is inserted), how shall I do that,

One example:  http://jphoto.sourceforge.net/?selected=sync
That runs a script to download images from one type of camera,
when it's hooked up.  Similar setups have been used to download
device firmware, start PDA hotsync daemons, and so on.
(I suppose the hotplug site should get an example too...)

If you need to load a kernel driver _and_ run a script, then
the name of the module and script should be the same; you
won't even need to modify usb.handmap if your driver is
written correctly (using MODULE_DEVICE_TABLE so
that "depmod" does its magic).

- Dave



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