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usb_altnum_to_altsetting
Langue: en
Version: June 2009 (debian - 07/07/09)
Section: 9 (Appels noyau Linux)
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
Contenus ©2006-2024 Benjamin Poulain
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