Re: [Libusb-devel] Patch: libusb/os/linux_usbfs.c: Distingush between usbfs and other kernel mode drivers

[Xiaofan C. <xia...@gm...>]

On Wed, Oct 6, 2010 at 1:05 PM, Xiaofan Chen <xia...@gm...> wrote:
> On Wed, Oct 6, 2010 at 11:55 AM, Peter Stuge <pe...@st...> wrote:
>> Xiaofan Chen wrote:
>>> I just wonder why "usbfs" is returned as the kernel driver.
>>
>> It *is* the name of the kernel driver. ;)
>>
>>> Probably that should be fixed (in the kernel or in libusb).
>>
>> Why is it wrong?
>>
>
> I do not think "usbfs" is a valid kernel driver name.

For example, I have never seen "usbfs" returned in libusb-0.1's
Linux only usb_get_driver_np().
http://libusb.sourceforge.net/doc/function.usbgetdrivernp.html
int usb_get_driver_np(usb_dev_handle *dev, int interface, char *name,
int namelen);
int usb_detach_kernel_driver_np(usb_dev_handle *dev, int interface);

libusb-1.0 API is a bit different. I also feel that the 0.1 API's is nicer here
since it can return the driver name. The 1.0 API does not have this
functionality and I think it is better to have one extended API to have
similar behavior of the 0.1 usb_get_driver_np API.

int libusb_kernel_driver_active (libusb_device_handle * dev, int  interface)
libusb_detach_kernel_driver(libusb_device_handle * dev, int  interface)
libusb_attach_kernel_driver(libusb_device_handle * dev, int  interface)

The last one has the behavior "Re-attach an interface's kernel driver,
which was previously detached using libusb_detach_kernel_driver().".

What if the device can have two types of driver?

-- 
Xiaofan