Dear Oliver: > -----Original Message----- > From: Oliver Neukum [mailto:oneukum@xxxxxxx] > Sent: Tuesday, March 05, 2013 4:49 PM > To: Fangxiaozhi (Franko) > Cc: Bjørn Mork; linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > Xueguiying (Zihan); Linlei (Lei Lin); greg@xxxxxxxxx; Yili (Neil); Wangyuhua > (Roger, Credit); Huqiao (C); balbi@xxxxxx; mdharm-usb@xxxxxxxxxxxxxxxxxx; > sebastian@xxxxxxxxxxxxx > Subject: Re: v3.8 regression: Huawei mode switching fails (was Re: [PATCH > 2/2]linux-usb:optimize to match the Huawei USB storage devices and support > new switch command) > > On Tuesday 05 March 2013 02:28:07 Fangxiaozhi wrote: > > Hi, > > > 1. As far as I know, usb_modeswitch is now only integrated in the PC Linux. > It isn't integrated to other system with linux kernel, such as Android, Chrome > OS, etc. On these system, how can we switch the device? > > Then those systems will have to add modeswitch. > If we are to do mode switching in kernel space, there has to be an additional > technical benefit over the existing and well working solution in user space. -----The vendor doesn't want to add the modeswitch on their system. We try to push them to do it, but they don't agree. > > > 2. usb_modeswitch often sends the Windows switching command to > switch Huawei device, but not sends Linux switching command. This maybe > causes some unexpected problem. > > You have two commands? What is the difference? Anyway, if usb_modeswitch > has issues, these problems need to be fixed. ------Sorry, it is one command, but with different values in it for different system, such as: 1. For Windows: {0x11, 0x06, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, - 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 2. For Mac OS: {0x11, 0x06, 0x10, 0x00, 0x00, 0x01, 0x01, 0x00, - 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 3. For Linux: {0x11, 0x06, 0x20, 0x00, 0x00, 0x01, 0x01, 0x00, - 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; Sometimes, modeswitch will send the command for Windows to device on Linux system, but not the command for Linux. > > Independent from that, there is a problem with user space mode switching. > Namely it doesn't work with reset_resume(). Thus we cannot do sane S4 with > the user space solution. > However, the problem cannot be solved by merely by adding the switch to the > storage driver. -----For this issue, can you offer more details? And we can try to solve it together. > > Regards > Oliver Best Regards, Franko Fang ��.n��������+%������w��{.n�����{���)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
