linux-kernel - Re: [linux-usb-devel] [RFC] HID bus design overview.

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Message-ID: <4610ABB1.3080606@gmail.com>
Date:	Mon, 02 Apr 2007 15:07:29 +0800
From:	Li Yu <raise.sail@...il.com>
To:	Dmitry Torokhov <dtor@...ightbb.com>
CC:	Li Yu <raise.sail@...il.com>, yanghong@...ss.com.cn,
	linux-usb-devel <linux-usb-devel@...ts.sourceforge.net>,
	hongzhiyi@...ss.com.cn, Jiri Kosina <jkosina@...e.cz>,
	Marcel Holtmann <marcel@...tmann.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] [RFC] HID bus design overview.

Dmitry Torokhov wrote:
>
> No, please don't do that. As soon as there is a special driver written
> for a device that device's VID/PID should be added to generic HID
> blacklist. This way udev will load the proper driver right away and
> there will not be any flip-flopping of input devices. 
>   
Hi, I do not think that using blacklist in base driver for this purpose
is good idea. If so, we need modify source when each new HID device
driver come, that's so ugly. I think the blacklist only should be used
for those really broken/buggy hardware, not for these normal hardware
with extended feature.

Er, I also want to know what are drawbacks of "flip-flopping" ?


>  
>   
>> When user A remove this shadow driver, the USB/base driver should resume
>> work for this joystick, IOW, it should register back its input device again.
>>
>>     
>
> Why would we want to revert to using generic HID's implementation if we
> know that it is broken for that particular device???
>
>   

Well, many devices just only can not play its full feature, not broken.
so base driver still can work for us.
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