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 <asm/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
__usb_ext_prop_ptr(u8 * buf,size_t offset)35 static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset)
36 {
37 return buf + offset;
38 }
39
usb_ext_prop_size_ptr(u8 * buf)40 static inline u8 *usb_ext_prop_size_ptr(u8 *buf)
41 {
42 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_SIZE);
43 }
44
usb_ext_prop_type_ptr(u8 * buf)45 static 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
usb_ext_prop_name_len_ptr(u8 * buf)50 static 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
usb_ext_prop_name_ptr(u8 * buf)55 static 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
usb_ext_prop_data_len_ptr(u8 * buf,size_t off)60 static 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
usb_ext_prop_data_ptr(u8 * buf,size_t off)66 static 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
usb_ext_prop_put_size(u8 * buf,int dw_size)71 static inline void usb_ext_prop_put_size(u8 *buf, int dw_size)
72 {
73 put_unaligned_le32(dw_size, usb_ext_prop_size_ptr(buf));
74 }
75
usb_ext_prop_put_type(u8 * buf,int type)76 static inline void usb_ext_prop_put_type(u8 *buf, int type)
77 {
78 put_unaligned_le32(type, usb_ext_prop_type_ptr(buf));
79 }
80
usb_ext_prop_put_name(u8 * buf,const char * name,int pnl)81 static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
82 {
83 int result;
84
85 put_unaligned_le16(pnl, usb_ext_prop_name_len_ptr(buf));
86 result = utf8s_to_utf16s(name, strlen(name), UTF16_LITTLE_ENDIAN,
87 (wchar_t *) usb_ext_prop_name_ptr(buf), pnl - 2);
88 if (result < 0)
89 return result;
90
91 put_unaligned_le16(0, &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl - 2]);
92
93 return pnl;
94 }
95
usb_ext_prop_put_binary(u8 * buf,int pnl,const u8 * data,int data_len)96 static inline void usb_ext_prop_put_binary(u8 *buf, int pnl, const u8 *data,
97 int data_len)
98 {
99 put_unaligned_le32(data_len, usb_ext_prop_data_len_ptr(buf, pnl));
100 memcpy(usb_ext_prop_data_ptr(buf, pnl), data, data_len);
101 }
102
usb_ext_prop_put_unicode(u8 * buf,int pnl,const char * string,int data_len)103 static 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(data_len, usb_ext_prop_data_len_ptr(buf, pnl));
108 result = utf8s_to_utf16s(string, data_len >> 1, UTF16_LITTLE_ENDIAN,
109 (wchar_t *) usb_ext_prop_data_ptr(buf, pnl),
110 data_len - 2);
111 if (result < 0)
112 return result;
113
114 put_unaligned_le16(0,
115 &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