RE: Linux hot swap support

From: Bloch, Jack (
Date: Wed Sep 18 2002 - 15:59:08 EST

Ok, my driver is for a specific cPCI biard which we have developed here. I
want the Linux Kernel to tell me when this board is inserted and/or removed.
I am running on a 700Mhz PIII with a 2.4.18-3 Kernel (Red Hat 7.3) My driver
is written with a call to pci_module_init in the init routine wherein I
specify a probe and remove routine. According to Linux Device Drivers 2nd
edition (pages 489 - 493), As long as the HW supports hot swap, I should get
called automatically whenevr one of the devices (vendor ID device ID) which
I specified in my table gets inserted or ejected. Am I totaly wrong about
this? I am not trying to write a driver for a hotplug controller but for a

Thanks in advance.

Jack Bloch
Siemens ICN
phone (561) 923-6550

-----Original Message-----
From: Greg KH []
Sent: Wednesday, September 18, 2002 4:38 PM
To: Bloch, Jack
Subject: Re: Linux hot swap support

Cced back to lkml as I hate taking things off-line unless it's
necessary, archives are your friend.

On Wed, Sep 18, 2002 at 07:50:49AM -0400, Bloch, Jack wrote:
> Thanks for the response. In my driver init routine, I use the
> pci_module_init( ) to register my driver with the PCI subsystem. Is this
> enough?

No, that's enough to register your driver as a PCI driver. I'm guessing
your pci hotplug controller looks like a PCI device?

> What exactly is the hotplug_core and or pcihpfs?

See drivers/hotplug/pci_hotplug.h for the interface that a pci hotplug
controller driver needs to interface with (specifcly the
pci_hp_register() and pci_hp_unregister() functions are what you need).

> Do I have to implement the pci_insert_device/pci_remove_device methods
> or does the kernel simply call the probe_one/remove_one which I
> specify during my initialization.

I'm confused, are you talking about a normal PCI card driver, or a PCI
Hotplug controller driver? What exactly does your driver do? Does it
talk to a specific PCI card, or does it control power to PCI slots?


greg k-h
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