Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964981AbWJJFP6 (ORCPT ); Tue, 10 Oct 2006 01:15:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964982AbWJJFP6 (ORCPT ); Tue, 10 Oct 2006 01:15:58 -0400 Received: from gateway.insightbb.com ([74.128.0.19]:43810 "EHLO asav13.insightbb.com") by vger.kernel.org with ESMTP id S964981AbWJJFP6 (ORCPT ); Tue, 10 Oct 2006 01:15:58 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AY8CAP7IKkWMByw From: Dmitry Torokhov To: Anssi Hannula Subject: Re: [linux-usb-devel] [PATCH] usb/hid: The HID Simple Driver Interface 0.3.2 (core) Date: Tue, 10 Oct 2006 01:15:39 -0400 User-Agent: KMail/1.9.3 Cc: "raise.sail@gmail.com" , greg , Randy Dunlap , LKML , linux-usb-devel References: <200609291624123283320@gmail.com> <200610082342.26110.dtor@insightbb.com> <452AD2D9.3090001@gmail.com> In-Reply-To: <452AD2D9.3090001@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200610100115.41449.dtor@insightbb.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1706 Lines: 42 On Monday 09 October 2006 18:53, Anssi Hannula wrote: > Dmitry Torokhov wrote: > > On Sunday 08 October 2006 14:51, Anssi Hannula wrote: > >> (I didn't get Dmitry's original mail, so replying here) > >> > >> raise.sail@gmail.com wrote: > >>> Dmitry Torokhov wrote: > >>>> Then there is issue with automatic loading of these sub-drivers. How > >>>> do they get loaded? Or we force everything to be built-in making HID > >>>> module very fat (like psmouse got pretty fat, but with HID prtential > >>>> for it to get very fat is much bigger). > >>>> > >>>> The better way would be to split hid-input into a library module that > >>>> parses hid usages and reports and is shared between device-specific > >>>> modules that are "real" drivers (usb-drivers, not hid-sub-drivers). > >> One possibility is to do that with symbol_request() and friends. That > >> would not be pretty though, imho. > >> > >> DVB subsystem uses that currently to load frontend modules dynamically, > >> see dvb_attach() and dvb_frontend_detach() in > >> drivers/media/dvb/dvb-core/dvbdev.h and > >> drivers/media/dvb/dvb-core/dvb_frontend.c. > >> > > > > Unfortunately this does not quite work when hid is built-in and the rest > > are modules :( > > > > How so? I see nothing obvious. > If hid (and hcd) is compiled in it will try binging to devices before userspace is up and symbol_request will not work. You could try playing with initramfs but it is kind of a hassle. -- Dmitry - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/