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 | |
35 | static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset) |
36 | { |
37 | return buf + offset; |
38 | } |
39 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
71 | static 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 | |
76 | static 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 | |
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(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 | |
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(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 | |
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(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 | |