linux-kernel - Re: Configuring previously loaded module

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Date:	Mon, 27 Aug 2007 00:15:25 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Thiago Ramos dos Santos" <dimtracker@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Configuring previously loaded module

On 8/27/07, Thiago Ramos dos Santos <dimtracker@...il.com> wrote:
> I have 2 devices which use the usbserial module: a CDMA modem and a
> Palm PDA (to be more especific, the PDA uses the visor module, which
> uses the usbserial).
> When I plug the PDA to the computer, the visor module gets
> automatically loaded by the kernel, and so is the usbserial module.
> When the modem is pluged, the module is not loaded automaticaly, so I
> created a hotplug entry for it.
> For both devices I put rules in udev configuration files, so they are
> autmaticaly mapped to the same /dev node in despite of the ttyUSB*
> node they are mapped to.
>
> The problem is that the modem requires the usbserial module to be
> loaded with some parameters: product=xxxxx vendor=xxxxx. So, if I plug
> the PDA first, the usbserial is loaded without those parameters, and
> when the modem is pluged, the ttyUSB nodes are not created for it. So
> I have to manually unload both the visor and usbserial modules, reload
> the usbserial with the specific parameters (to get the ttyUSB nodes
> for the modem) and reload the visor module (to recreate the ttyUSB
> nodes for the PDA).
>
> Is there anyway to configure the previously loaded usbserial module
> with the modem parameters without having to unload it? If it is not
> possible, is there any other solution?

Try putting:
  options usbserial product=xxxxx vendor=xxxxx
in:
  /etc/modprobe.d/serial

Kay
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