linux-kernel - Re: USB card reader and HAL

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Message-ID: <20070629072016.GA22715@DervishD>
Date:	Fri, 29 Jun 2007 09:20:16 +0200
From:	DervishD <lkml@...vishd.net>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: USB card reader and HAL

    Hi Kay :)

 * Kay Sievers <kay.sievers@...y.org> dixit:
> On 6/28/07, DervishD <lkml@...vishd.net> wrote:
> >    When I insert a card in the reader, it is not detected, no udev
> >event is generated and I have to do things like "hdparm -z /dev/sda" to
> >"probe" the card. Moreover, I have to do the same when removing the card
> >or the /dev/sdaX nodes are not deleted.
> >
> >    Is HAL the only way of making it work? Is there any CONFIG_ thing
> >I've forgotten in my kernel?
> 
> You have to open() the device node to trigger events from the kernel,
> the kernel itself will not do that for you. HAL polls the device every
> few seconds.

    So, opening the node and checking for ENOMEDIUM is the only
solution... Polling looks like a waste of time, and given that I use the
reader once a month or so, HAL will be a waste of resources. I'll resort
to manually do "hdparm -z" (or something similar) when I need to insert
or remove a card.

    Thanks for confirming, Kay :))

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736 | http://www.dervishd.net
It's my PC and I'll cry if I want to... RAmen!
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