usb_gadget_get_strin(9)
NAME
usb_gadget_get_string - fill out a string descriptor
SYNOPSIS
int usb_gadget_get_string(struct usb_gadget_strings * table, int id,
u8 * buf);
ARGUMENTS
- table
- of c strings encoded using UTF-8
- id
- string id, from low byte of wValue in get string descriptor
- buf
- at least 256 bytes
DESCRIPTION
Finds the UTF-8 string matching the ID, and converts it into a string
descriptor in utf16-le. Returns length of descriptor (always even) or
negative errno
If your driver needs stings in multiple languages, youŽll probably
"switch (wIndex) { ... }" in your ep0 string descriptor logic, using
this routine after choosing which set of UTF-8 strings to use. Note
that US-ASCII is a strict subset of UTF-8; any string bytes with the
eighth bit set will be multibyte UTF-8 characters, not ISO-8859/1
characters (which are also widely used in C strings).
AUTHOR
- David Brownell <dbrownell@users.sourceforge.net>
- Author.