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[karo-tx-linux.git] / drivers / usb / gadget / u_os_desc.h
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
38 static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset)
39 {
40         return buf + offset;
41 }
42
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
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
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
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
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
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
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
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
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
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
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__ */