USB Hot and coldplugging

USB Hot and coldplugging

[Akshay Srinivas]

Hi Greg,
I wanted to use USB Hotplugging mechanism for some requirement. Basically 
my application need to subscribe for USB notification callback i.e . 
whenever uSB is inserted/removedf my app need to know. I was understanding 
the flow, I came to know that kernel will call /sbin/hotplug, if this 
script is called with usb arg then it will look for /etc/hotplug.d/usb/ 
and execute (all?) program(s) ending with .hotplug. Also i wanted to know 
where in kernel sbin/hotplug will get called. Can u explain me the overall 
flow with brief explanation. How does the cold plug work and how do the 
user program can register for a callback

Warm Regards,
Akshay
NXP Semiconductors
Bangalore, India.
Ph No: +91 80 40247383

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Re: USB Hot and coldplugging

[Greg KH]

On Mon, Nov 20, 2006 at 12:34:28PM +0530, Akshay Srinivas wrote:
> Hi Greg,
> I wanted to use USB Hotplugging mechanism for some requirement. Basically 
> my application need to subscribe for USB notification callback i.e . 
> whenever uSB is inserted/removedf my app need to know. I was understanding 
> the flow, I came to know that kernel will call /sbin/hotplug, if this 
> script is called with usb arg then it will look for /etc/hotplug.d/usb/ 
> and execute (all?) program(s) ending with .hotplug. Also i wanted to know 
> where in kernel sbin/hotplug will get called. Can u explain me the overall 
> flow with brief explanation. How does the cold plug work and how do the 
> user program can register for a callback

I'd recommend just watching the DBUS for HAL events for every usb device
added or removed from the system.  That's a lot easier than trying to
execute your own program from the hotplug scripts.

Hope this helps,

greg k-h

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