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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
// SPDX-License-Identifier: LGPL-2.1+
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/*
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* Copyright (C) 2003 David Brownell
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*
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* Ported to U-Boot by: Thomas Smits <ts.smits@gmail.com> and
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* Remy Bohmer <linux@bohmer.net>
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*/
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#include <common.h>
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#include <linux/errno.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/utf.h>
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/**
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* usb_gadget_get_string - fill out a string descriptor
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* @table: of c strings encoded using UTF-8
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* @id: string id, from low byte of wValue in get string descriptor
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* @buf: at least 256 bytes
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*
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* Finds the UTF-8 string matching the ID, and converts it into a
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* string descriptor in utf16-le.
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* Returns length of descriptor (always even) or negative errno
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*
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* If your driver needs stings in multiple languages, you'll probably
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* "switch (wIndex) { ... }" in your ep0 string descriptor logic,
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* using this routine after choosing which set of UTF-8 strings to use.
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* Note that US-ASCII is a strict subset of UTF-8; any string bytes with
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* the eighth bit set will be multibyte UTF-8 characters, not ISO-8859/1
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* characters (which are also widely used in C strings).
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*/
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int
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usb_gadget_get_string(struct usb_gadget_strings *table, int id, u8 *buf)
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{
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struct usb_string *s;
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int len;
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if (!table)
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return -EINVAL;
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/* descriptor 0 has the language id */
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if (id == 0) {
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buf[0] = 4;
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buf[1] = USB_DT_STRING;
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buf[2] = (u8) table->language;
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buf[3] = (u8) (table->language >> 8);
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return 4;
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}
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for (s = table->strings; s && s->s; s++)
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if (s->id == id)
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break;
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/* unrecognized: stall. */
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if (!s || !s->s)
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return -EINVAL;
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/* string descriptors have length, tag, then UTF16-LE text */
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len = min((size_t) 126, strlen(s->s));
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memset(buf + 2, 0, 2 * len); /* zero all the bytes */
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len = utf8_to_utf16le(s->s, (__le16 *)&buf[2], len);
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if (len < 0)
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return -EINVAL;
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buf[0] = (len + 1) * 2;
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buf[1] = USB_DT_STRING;
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return buf[0];
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}
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