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
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(dw_size, 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(type, 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(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
96static 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
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(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