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SubjectRE: [PATCH] USB: Mass Storage: Add MediaTek MT6276M device entry
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.


Meng Zhang

-----Original Message-----
From: [] 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 <>
> 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://
> Signed-off-by: Meng Zhang <>

Nowadays, aren't such things handled in userspace by the usb_modeswitch program rather than in the kernel driver?

Alan Stern

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