linux-kernel - Re: [PATCH] USB: Mass Storage: Add MediaTek MT6276M device entry

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Message-ID: <CAA6KcBBdQT7So0SbiROg=aYCySnQrKPuShc-R-_bDvdYzgqUTg@mail.gmail.com>
Date:	Tue, 28 Feb 2012 22:46:41 -0800
From:	Matthew Dharm <mdharm-usb@...-eyed-alien.net>
To:	Meng Zhang (张萌) <Meng.Zhang@...iatek.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Josua Dietze <digidietze@...isberghof.de>,
	Phil Dibowitz <phil@...m.com>,
	USB list <linux-usb@...r.kernel.org>,
	USB Storage list <usb-storage@...ts.one-eyed-alien.net>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: Mass Storage: Add MediaTek MT6276M device entry

My understanding is that usb_modeswitch is part of most distributions,
but that is really a question for the distro guys...

Matt

2012/2/28 Meng Zhang (张萌) <Meng.Zhang@...iatek.com>:
> Hi Matthew,
>
> Thanks for your comment, I've tested some other products and found their entries in /lib/udev/rules.d/40-usb_modeswitch.rules.
> So, does usb_modeswitch comes with latest distributions by default?
>
> Thanks!
>
> BR.
> Meng Zhang
>
>
> -----Original Message-----
> From: Matthew Dharm [mailto:mdharm-usb@...-eyed-alien.net]
> Sent: Wednesday, February 29, 2012 12:08 PM
> To: Meng Zhang (张萌)
> Cc: Alan Stern; Josua Dietze; Phil Dibowitz; USB list; USB Storage list; Kernel development list
> Subject: Re: [PATCH] USB: Mass Storage: Add MediaTek MT6276M device entry
>
> Devices should not be added to unusual_devs.h unless the device CANNOT use the usb_modeswitch method.  This most commonly applies when the device's usb-storage emulation is poor, and the probing commands sent by usb-storage cause the device to crash.
>
> It is much more convenient for users to just upgrade their usb_modeswitch utility than it is for them to upgrade a kernel, which is much more difficult and much more rare.  As for 'input command manually', that is what udev scripts are for.
>
> If this can be handled from userspace by usb_modeswitch, then that is where it should be done.
>
> Matt
>
> 2012/2/28 Meng Zhang (张萌) <Meng.Zhang@...iatek.com>:
>> Hi Alan,
>>
>> As far as I know, many other devices used this init function in unusual_devs.h for their "ZeroCD" feature, and I think this is more convenient than let device user install utilities like usb_modeswitch and input command manually.
>>
>> Thanks.
>>
>> BR.
>> Meng Zhang
>>
>> -----Original Message-----
>> From: linux-usb-owner@...r.kernel.org
>> [mailto:linux-usb-owner@...r.kernel.org] On Behalf Of Alan Stern
>> Sent: Tuesday, February 28, 2012 11:31 PM
>> To: Meng Zhang (张萌)
>> Cc: Josua Dietze; Matthew Dharm; Phil Dibowitz; USB list; USB Storage
>> list; Kernel development list
>> Subject: Re: [PATCH] USB: Mass Storage: Add MediaTek MT6276M device
>> entry
>>
>> On Tue, 28 Feb 2012, Meng Zhang wrote:
>>
>>> from: Meng Zhang <meng.zhang@...iatek.com>
>>>
>>> 1. Add entrys for mediatek MT6276M in unusual_devs.h
>>>
>>> 2. Add init function for mediatek MT6276M to switch to COM port mode
>>>
>>> 3. usb-devices outputs after running with this patch:
>>> T:  Bus=02 Lev=01 Prnt=01 Port=05 Cnt=01 Dev#= 48 Spd=480 MxCh= 0
>>> D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
>>> P:  Vendor=0e8d ProdID=00a1 Rev=02.00
>>> S:  Manufacturer=MediaTek Inc
>>> S:  Product=Product
>>> C:  #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=500mA
>>> I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=02 Prot=01 Driver=option
>>> I:  If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
>>> I:  If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
>>>
>>> 4. patch based on branch:
>>>
>>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>
>>>
>>> Signed-off-by: Meng Zhang <meng.zhang@...iatek.com>
>>
>> Nowadays, aren't such things handled in userspace by the usb_modeswitch program rather than in the kernel driver?
>>
>> Alan Stern
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-usb"
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>
>
>
> --
> Matthew Dharm
> Maintainer, USB Mass Storage driver for Linux



-- 
Matthew Dharm
Maintainer, USB Mass Storage driver for Linux
--
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