1 /*
2 * u_os_desc.h
3 *
4 * Utility definitions for "OS Descriptors" support
5 *
6 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 * http://www.samsung.com
8 *
9 * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #ifndef __U_OS_DESC_H__
17 #define __U_OS_DESC_H__
18
19 #include <asm/unaligned.h>
20 #include <linux/nls.h>
21
22 #define USB_EXT_PROP_DW_SIZE 0
23 #define USB_EXT_PROP_DW_PROPERTY_DATA_TYPE 4
24 #define USB_EXT_PROP_W_PROPERTY_NAME_LENGTH 8
25 #define USB_EXT_PROP_B_PROPERTY_NAME 10
26 #define USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH 10
27 #define USB_EXT_PROP_B_PROPERTY_DATA 14
28
29 #define USB_EXT_PROP_RESERVED 0
30 #define USB_EXT_PROP_UNICODE 1
31 #define USB_EXT_PROP_UNICODE_ENV 2
32 #define USB_EXT_PROP_BINARY 3
33 #define USB_EXT_PROP_LE32 4
34 #define USB_EXT_PROP_BE32 5
35 #define USB_EXT_PROP_UNICODE_LINK 6
36 #define USB_EXT_PROP_UNICODE_MULTI 7
37
__usb_ext_prop_ptr(u8 * buf,size_t offset)38 static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset)
39 {
40 return buf + offset;
41 }
42
usb_ext_prop_size_ptr(u8 * buf)43 static inline u8 *usb_ext_prop_size_ptr(u8 *buf)
44 {
45 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_SIZE);
46 }
47
usb_ext_prop_type_ptr(u8 * buf)48 static inline u8 *usb_ext_prop_type_ptr(u8 *buf)
49 {
50 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_PROPERTY_DATA_TYPE);
51 }
52
usb_ext_prop_name_len_ptr(u8 * buf)53 static inline u8 *usb_ext_prop_name_len_ptr(u8 *buf)
54 {
55 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_W_PROPERTY_NAME_LENGTH);
56 }
57
usb_ext_prop_name_ptr(u8 * buf)58 static inline u8 *usb_ext_prop_name_ptr(u8 *buf)
59 {
60 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_NAME);
61 }
62
usb_ext_prop_data_len_ptr(u8 * buf,size_t off)63 static inline u8 *usb_ext_prop_data_len_ptr(u8 *buf, size_t off)
64 {
65 return __usb_ext_prop_ptr(buf,
66 USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + off);
67 }
68
usb_ext_prop_data_ptr(u8 * buf,size_t off)69 static inline u8 *usb_ext_prop_data_ptr(u8 *buf, size_t off)
70 {
71 return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_DATA + off);
72 }
73
usb_ext_prop_put_size(u8 * buf,int dw_size)74 static inline void usb_ext_prop_put_size(u8 *buf, int dw_size)
75 {
76 put_unaligned_le32(dw_size, usb_ext_prop_size_ptr(buf));
77 }
78
usb_ext_prop_put_type(u8 * buf,int type)79 static inline void usb_ext_prop_put_type(u8 *buf, int type)
80 {
81 put_unaligned_le32(type, usb_ext_prop_type_ptr(buf));
82 }
83
usb_ext_prop_put_name(u8 * buf,const char * name,int pnl)84 static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
85 {
86 int result;
87
88 put_unaligned_le16(pnl, usb_ext_prop_name_len_ptr(buf));
89 result = utf8s_to_utf16s(name, strlen(name), UTF16_LITTLE_ENDIAN,
90 (wchar_t *) usb_ext_prop_name_ptr(buf), pnl - 2);
91 if (result < 0)
92 return result;
93
94 put_unaligned_le16(0, &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl - 2]);
95
96 return pnl;
97 }
98
usb_ext_prop_put_binary(u8 * buf,int pnl,const u8 * data,int data_len)99 static inline void usb_ext_prop_put_binary(u8 *buf, int pnl, const u8 *data,
100 int data_len)
101 {
102 put_unaligned_le32(data_len, usb_ext_prop_data_len_ptr(buf, pnl));
103 memcpy(usb_ext_prop_data_ptr(buf, pnl), data, data_len);
104 }
105
usb_ext_prop_put_unicode(u8 * buf,int pnl,const char * string,int data_len)106 static inline int usb_ext_prop_put_unicode(u8 *buf, int pnl, const char *string,
107 int data_len)
108 {
109 int result;
110 put_unaligned_le32(data_len, usb_ext_prop_data_len_ptr(buf, pnl));
111 result = utf8s_to_utf16s(string, data_len >> 1, UTF16_LITTLE_ENDIAN,
112 (wchar_t *) usb_ext_prop_data_ptr(buf, pnl),
113 data_len - 2);
114 if (result < 0)
115 return result;
116
117 put_unaligned_le16(0,
118 &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl + data_len - 2]);
119
120 return data_len;
121 }
122
123 #endif /* __U_OS_DESC_H__ */
124