linux-kernel - Re: [RFC ebeam PATCH v3 1/2] hid: Blacklist new eBeam classic device

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Message-ID: <20120807014510.GB21477@core.coreip.homeip.net>
Date:	Mon, 6 Aug 2012 18:45:10 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Yann Cantin <yann.cantin@...oste.net>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-input@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC ebeam PATCH v3 1/2] hid: Blacklist new eBeam classic device

On Tue, Aug 07, 2012 at 03:21:45AM +0200, Yann Cantin wrote:
> Le 07/08/2012 00:07, Dmitry Torokhov a écrit :
> > On Monday, August 06, 2012 02:43:40 PM Greg KH wrote:
> >> On Mon, Aug 06, 2012 at 11:21:43PM +0200, Yann Cantin wrote:
> >>> Signed-off-by: Yann Cantin <yann.cantin@...oste.net>
> >>> ---
> >>>
> >>>  drivers/hid/hid-core.c |    3 +++
> >>>  drivers/hid/hid-ids.h  |    3 +++
> >>>  2 files changed, 6 insertions(+)
> >>>
> >>> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> >>> index 60ea284..b1ed8ee 100644
> >>> --- a/drivers/hid/hid-core.c
> >>> +++ b/drivers/hid/hid-core.c
> >>> @@ -1908,6 +1908,9 @@ static const struct hid_device_id hid_ignore_list[]
> >>> = {> 
> >>>  	{ HID_USB_DEVICE(USB_VENDOR_ID_DELORME, USB_DEVICE_ID_DELORME_EM_LT20)
> >>>  	},
> >>>  	{ HID_USB_DEVICE(USB_VENDOR_ID_DREAM_CHEEKY, 0x0004) },
> >>>  	{ HID_USB_DEVICE(USB_VENDOR_ID_DREAM_CHEEKY, 0x000a) },
> >>>
> >>> +#if defined(CONFIG_INPUT_EBEAM_USB)
> >>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_EFI, USB_DEVICE_ID_EFI_CLASSIC) },
> >>> +#endif
> >>
> >> Why is this #if in here?  Just always do it, how could it not be
> >> defined?
> > 
> > User might disable the driver and CONFIG_INPUT_EBEAM_USB will not be
> > set. But I agree, since the device is unusable with generic HID driver
> > there is no point in doing this conditionally.
> 
> There's a closed-source user-space stack (libusb based daemon + xorg driver
> + wine apps) provided for some distro (Ubuntu 10.04, works on mandriva 2010,
> maybe others but break on recent xorg).
> 
> I don't know exactly what to do : i don't want to break hypothetical support,
> even proprietary.
> Leaving the choice at kernel compile time seems to be safer, no ?

If they are using libusb that means that they use userspace solution and
do not require HID or any other in-kernel driver. They should still be
able to claim the port even if your driver is in use.

Thanks.

-- 
Dmitry
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