usb: gadget: move utf8_to_utf16le to header file
As other users may use utf8_to_utf16le() to convert the utf8
to utf16 for usb, so move it to head file.
Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/usb/gadget/usbstring.c b/drivers/usb/gadget/usbstring.c
index 83cdd8a..e2464ad 100644
--- a/drivers/usb/gadget/usbstring.c
+++ b/drivers/usb/gadget/usbstring.c
@@ -10,79 +10,7 @@
#include <linux/errno.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
-
-#include <asm/unaligned.h>
-
-
-static int utf8_to_utf16le(const char *s, __le16 *cp, unsigned len)
-{
- int count = 0;
- u8 c;
- u16 uchar;
-
- /*
- * this insists on correct encodings, though not minimal ones.
- * BUT it currently rejects legit 4-byte UTF-8 code points,
- * which need surrogate pairs. (Unicode 3.1 can use them.)
- */
- while (len != 0 && (c = (u8) *s++) != 0) {
- if ((c & 0x80)) {
- /*
- * 2-byte sequence:
- * 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx
- */
- if ((c & 0xe0) == 0xc0) {
- uchar = (c & 0x1f) << 6;
-
- c = (u8) *s++;
- if ((c & 0xc0) != 0x80)
- goto fail;
- c &= 0x3f;
- uchar |= c;
-
- /*
- * 3-byte sequence (most CJKV characters):
- * zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx
- */
- } else if ((c & 0xf0) == 0xe0) {
- uchar = (c & 0x0f) << 12;
-
- c = (u8) *s++;
- if ((c & 0xc0) != 0x80)
- goto fail;
- c &= 0x3f;
- uchar |= c << 6;
-
- c = (u8) *s++;
- if ((c & 0xc0) != 0x80)
- goto fail;
- c &= 0x3f;
- uchar |= c;
-
- /* no bogus surrogates */
- if (0xd800 <= uchar && uchar <= 0xdfff)
- goto fail;
-
- /*
- * 4-byte sequence (surrogate pairs, currently rare):
- * 11101110wwwwzzzzyy + 110111yyyyxxxxxx
- * = 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
- * (uuuuu = wwww + 1)
- * FIXME accept the surrogate code points (only)
- */
- } else
- goto fail;
- } else
- uchar = c;
- put_unaligned_le16(uchar, cp++);
- count++;
- len--;
- }
- return count;
-fail:
- return -1;
-}
-
+#include <linux/utf.h>
/**
* usb_gadget_get_string - fill out a string descriptor