1USB_ALTNUM_TO_ALTSET(9)          USB Core APIs         USB_ALTNUM_TO_ALTSET(9)
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NAME

6       usb_altnum_to_altsetting - get the altsetting structure with a given
7       alternate setting number.
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SYNOPSIS

10       struct usb_host_interface *
11                                                            usb_altnum_to_altsetting(const struct usb_interface * intf,
12                                                            unsigned int altnum);
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ARGUMENTS

15       intf
16           the interface containing the altsetting in question
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18       altnum
19           the desired alternate setting number
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DESCRIPTION

22       This searches the altsetting array of the specified interface for an
23       entry with the correct bAlternateSetting value and returns a pointer to
24       that entry, or null.
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26       Note that altsettings need not be stored sequentially by number, so it
27       would be incorrect to assume that the first altsetting entry in the
28       array corresponds to altsetting zero. This routine helps device drivers
29       avoid such mistakes.
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31       Don´t call this function unless you are bound to the intf interface or
32       you have locked the device!
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35Kernel Hackers Manual 2.6.         June 2019           USB_ALTNUM_TO_ALTSET(9)
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