Hi, On Mon, Oct 11, 2010 at 4:25 AM, Roger Quadros <roger.quadros@xxxxxxxxx> wrote: > On 10/09/2010 02:46 PM, ext Linus Walleij wrote: >> >> 2010/10/7 Brett Werling<bwerl.dev@xxxxxxxxx>: >> >>> Does anyone know what the status is on the requirement of the MS OS >>> Descriptor? I'm trying to determine what the best course of action is >>> for determining if a host supports MTP. >> >> If you want your device to work on older Windowses (up to Windows XP) >> it is required. Given the proliferation of WinXPs you might be worried: >> >> http://tech.slashdot.org/story/10/10/03/1240252/66-of-All-Windows-Users-Still-Use-Windows-XP >> >> With Windows Vista and forward it is not required, it will recognize the >> new class code. >> > > As far as I remember, XP will request for OS descriptor only if you use > vendor specific class code (i.e. 0xFF). > If you use PTP class code it will treat it as a PTP device and will not > request for the OS descriptor. > > But better to verify what i'm saying. I have more or less confirmed this in my development. When I used g_mtp as-is, XP assumed it was a PTP device. This is not necessarily desirable for me, so I will most likely have to go the MS OS Descriptor route. > > -- > regards, > -roger > Do you guys know of a place where I can find what is required by Microsoft to use this descriptor? Do they just require some sort of "I didn't change anything" agreement, or is there a licensing / royalty / etc. issue attached? I couldn't find anything on the web so far, just figured I'd ask people who might have experience in this. Thanks, Brett -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
