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USB_ALTNUM_TO_ALTSET(9) 					   USB Core APIs					   USB_ALTNUM_TO_ALTSET(9)

NAME
       usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number.

SYNOPSIS
       struct usb_host_interface * usb_altnum_to_altsetting(const struct usb_interface * intf, unsigned int altnum);

ARGUMENTS
       intf
	   the interface containing the altsetting in question

       altnum
	   the desired alternate setting number

DESCRIPTION
       This searches the altsetting array of the specified interface for an entry with the correct bAlternateSetting value and returns a pointer
       to that entry, or null.

       Note that altsettings need not be stored sequentially by number, so it would be incorrect to assume that the first altsetting entry in the
       array corresponds to altsetting zero. This routine helps device drivers avoid such mistakes.

       Don't call this function unless you are bound to the intf interface or you have locked the device!

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						   USB_ALTNUM_TO_ALTSET(9)