On Thu, 27 Nov 2008, Eberhard Fahle wrote:
> Hi,
> On Donnerstag, 27. November 2008 16:56:32 Alan Stern wrote:
> > On Thu, 27 Nov 2008, Eberhard Fahle wrote:
> > > I'd sign that petiton for a user-editable "hid-quirks" file right away!
> > >
> > > This is the second time I come along a HID-Device that is grabbed by the
> > > hiddev/hidraw drivers without suppling the necessary tools to actually
> > > use the device!
> > > Current issue : Device is grabbed by hidraw, and you can't even check the
> > > interface-number of the device you are looking at.
> > I don't understand this comment. Do you mean that you can't tell which
> > underlying USB interface or device is associated with a particular
> > hidraw device file?
> Right. In the hiddev-driver the device-info structure has everything one could
> possibly need to know:
> struct hiddev_devinfo {
> __u32 bustype;
> __u32 busnum;
> __u32 devnum;
> __u32 ifnum;
> __s16 vendor;
> __s16 product;
> __s16 version;
> __u32 num_applications;
> };
>
> And for some reason I don't understand, this is what's exposed of the above by
> the hidraw driver (which keeps a struct hid_device internally and simply
> copies all the information from there):
>
> struct hidraw_devinfo {
> __u32 bustype;
> __s16 vendor;
> __s16 product;
> };
>
> At least knowing the interface-number is essential I think
>
> And hidraw has no ioctl to get a string-descriptor from the device (Serial-
> Numbers are very common nowadays)
>
> > There's no point debating this sort of thing on the libusb-devel
> > mailing list.
> Yes.
> > If you're serious about it then you should post on the
> > linux-usb list, where the kernel developers will become aware of your
> > thoughts. Better yet, instead of debating the issue, submit a patch!
> I going to prepare for the hidraw driver since it basically works fine for my
> specific device.
I still think it's worthwhile to bring this to the attention of the
appropriate kernel developers. In fact, I'll get the process started:
Dmitry, is there any way to accomplish what Eberhard wants to do?
Alan Stern
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