USB device getting different product ids
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From: Dhaval Giani on 10 Aug 2010 11:10 Heya, Admittedly I am using an older kernel, but I was wondering if a USB device can get different product ids on being plugged in at different times. I have one of these nice USB modems to connect to the internet .. It is one of these huawei devices. Now, most of the times, it gets detected with vendor id 0x12d1 and product id 0x1446. In this mode, on loading the usbserial module, I see only ttyUSB0 come up, which for whatever reason, I am unable to use to connect to the internet. However when it is detected as the product id 0x140b, I get ttyUSB[0-2] which then connects very nicely via both wvdial and networkmanager to the internet. Now obviously, I would like for the device to get detected as 0x140b each time, as opposed to me pulling it out and inserting it back in till does get detected as 0x140b :-). So my question is, 1. Is it possible for the same device to get different product ids at different times 2. If so, how do I possibly get it to detect the id I want, as opposed to playing a game of chance. I am currently using the Fedora 13 default kernel. Thanks, Dhaval (I would copy linux-usb if I knew the mailing list id, but as I am on a slow GPRS connection, which is quite flaky right now, I would like to send this out right now. Please copy that list if it would help!) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Greg KH on 10 Aug 2010 16:40
On Tue, Aug 10, 2010 at 05:08:00PM +0200, Dhaval Giani wrote: > Heya, > > Admittedly I am using an older kernel, but I was wondering if a USB > device can get different product ids on being plugged in at different > times. I have one of these nice USB modems to connect to the internet > . It is one of these huawei devices. Now, most of the times, it gets > detected with vendor id 0x12d1 and product id 0x1446. In this mode, on > loading the usbserial module, I see only ttyUSB0 come up, which for > whatever reason, I am unable to use to connect to the internet. > However when it is detected as the product id 0x140b, I get > ttyUSB[0-2] which then connects very nicely via both wvdial and > networkmanager to the internet. Now obviously, I would like for the > device to get detected as 0x140b each time, as opposed to me pulling > it out and inserting it back in till does get detected as 0x140b :-). > > So my question is, > > 1. Is it possible for the same device to get different product ids at > different times Yes, it's quite common for some devices to do this. > 2. If so, how do I possibly get it to detect the id I want, as opposed > to playing a game of chance. Look at the usb-modeswitch program, it's what you want to control this. > (I would copy linux-usb if I knew the mailing list id, but as I am on > a slow GPRS connection, which is quite flaky right now, I would like > to send this out right now. Please copy that list if it would help!) In the future, it's the linux-usb(a)vger.kernel.org list, also available in the MAINTAINERS file. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |