usb_ifnum_to_if man page on Scientific

usb_ifnum_to_if man page on Scientific

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USB_IFNUM_TO_IF(9)		 USB Core APIs		    USB_IFNUM_TO_IF(9)

NAME
       usb_ifnum_to_if - get the interface object with a given interface
       number

SYNOPSIS
       struct usb_interface * usb_ifnum_to_if(const struct usb_device * dev,
					      unsigned ifnum);

ARGUMENTS
       dev
	   the device whose current configuration is considered

       ifnum
	   the desired interface

DESCRIPTION
       This walks the device descriptor for the currently active configuration
       and returns a pointer to the interface with that particular interface
       number, or null.

       Note that configuration descriptors are not required to assign
       interface numbers sequentially, so that it would be incorrect to assume
       that the first interface in that descriptor corresponds to interface
       zero. This routine helps device drivers avoid such mistakes. However,
       you should make sure that you do the right thing with any alternate
       settings available for this interfaces.

       Don´t call this function unless you are bound to one of the interfaces
       on this device or you have locked the device!

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		    USB_IFNUM_TO_IF(9)

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