1// SPDX-License-Identifier: GPL-2.0
2/*
3 * u_os_desc.h
4 *
5 * Utility definitions for "OS Descriptors" support
6 *
7 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
8 * http://www.samsung.com
9 *
10 * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
11 */
12
13#ifndef __U_OS_DESC_H__
14#define __U_OS_DESC_H__
15
16#include <linux/unaligned.h>
17#include <linux/nls.h>
18
19#define USB_EXT_PROP_DW_SIZE 0
20#define USB_EXT_PROP_DW_PROPERTY_DATA_TYPE 4
21#define USB_EXT_PROP_W_PROPERTY_NAME_LENGTH 8
22#define USB_EXT_PROP_B_PROPERTY_NAME 10
23#define USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH 10
24#define USB_EXT_PROP_B_PROPERTY_DATA 14
25
26#define USB_EXT_PROP_RESERVED 0
27#define USB_EXT_PROP_UNICODE 1
28#define USB_EXT_PROP_UNICODE_ENV 2
29#define USB_EXT_PROP_BINARY 3
30#define USB_EXT_PROP_LE32 4
31#define USB_EXT_PROP_BE32 5
32#define USB_EXT_PROP_UNICODE_LINK 6
33#define USB_EXT_PROP_UNICODE_MULTI 7
34
35static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset)
36{
37 return buf + offset;
38}
39
40static inline u8 *usb_ext_prop_size_ptr(u8 *buf)
41{
42 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_SIZE);
43}
44
45static inline u8 *usb_ext_prop_type_ptr(u8 *buf)
46{
47 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_PROPERTY_DATA_TYPE);
48}
49
50static inline u8 *usb_ext_prop_name_len_ptr(u8 *buf)
51{
52 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_W_PROPERTY_NAME_LENGTH);
53}
54
55static inline u8 *usb_ext_prop_name_ptr(u8 *buf)
56{
57 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_NAME);
58}
59
60static inline u8 *usb_ext_prop_data_len_ptr(u8 *buf, size_t off)
61{
62 return __usb_ext_prop_ptr(buf,
63 USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + off);
64}
65
66static inline u8 *usb_ext_prop_data_ptr(u8 *buf, size_t off)
67{
68 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_DATA + off);
69}
70
71static inline void usb_ext_prop_put_size(u8 *buf, int dw_size)
72{
73 put_unaligned_le32(val: dw_size, p: usb_ext_prop_size_ptr(buf));
74}
75
76static inline void usb_ext_prop_put_type(u8 *buf, int type)
77{
78 put_unaligned_le32(val: type, p: usb_ext_prop_type_ptr(buf));
79}
80
81static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
82{
83 int result;
84
85 put_unaligned_le16(val: pnl, p: usb_ext_prop_name_len_ptr(buf));
86 result = utf8s_to_utf16s(s: name, strlen(name), endian: UTF16_LITTLE_ENDIAN,
87 pwcs: (wchar_t *) usb_ext_prop_name_ptr(buf), maxlen: pnl - 2);
88 if (result < 0)
89 return result;
90
91 put_unaligned_le16(val: 0, p: &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl - 2]);
92
93 return pnl;
94}
95
96static inline void usb_ext_prop_put_binary(u8 *buf, int pnl, const u8 *data,
97 int data_len)
98{
99 put_unaligned_le32(val: data_len, p: usb_ext_prop_data_len_ptr(buf, off: pnl));
100 memcpy(usb_ext_prop_data_ptr(buf, pnl), data, data_len);
101}
102
103static inline int usb_ext_prop_put_unicode(u8 *buf, int pnl, const char *string,
104 int data_len)
105{
106 int result;
107 put_unaligned_le32(val: data_len, p: usb_ext_prop_data_len_ptr(buf, off: pnl));
108 result = utf8s_to_utf16s(s: string, len: data_len >> 1, endian: UTF16_LITTLE_ENDIAN,
109 pwcs: (wchar_t *) usb_ext_prop_data_ptr(buf, off: pnl),
110 maxlen: data_len - 2);
111 if (result < 0)
112 return result;
113
114 put_unaligned_le16(val: 0,
115 p: &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl + data_len - 2]);
116
117 return data_len;
118}
119
120#endif /* __U_OS_DESC_H__ */
121

source code of linux/drivers/usb/gadget/u_os_desc.h