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 void usb_ext_prop_put_size(u8 *buf, int dw_size)
  39 {
  40         put_unaligned_le32(dw_size, &buf[USB_EXT_PROP_DW_SIZE]);
  41 }
  42
  43 static inline void usb_ext_prop_put_type(u8 *buf, int type)
  44 {
  45         put_unaligned_le32(type, &buf[USB_EXT_PROP_DW_PROPERTY_DATA_TYPE]);
  46 }
  47
  48 static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
  49 {
  50         int result;
  51
  52         put_unaligned_le16(pnl, &buf[USB_EXT_PROP_W_PROPERTY_NAME_LENGTH]);
  53         result = utf8s_to_utf16s(name, strlen(name), UTF16_LITTLE_ENDIAN,
  54                 (wchar_t *) &buf[USB_EXT_PROP_B_PROPERTY_NAME], pnl - 2);
  55         if (result < 0)
  56                 return result;
  57
  58         put_unaligned_le16(0, &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl]);
  59
  60         return pnl;
  61 }
  62
  63 static inline void usb_ext_prop_put_binary(u8 *buf, int pnl, const u8 *data,
  64                                            int data_len)
  65 {
  66         put_unaligned_le32(data_len,
  67                            &buf[USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + pnl]);
  68         memcpy(&buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl], data, data_len);
  69 }
  70
  71 static inline int usb_ext_prop_put_unicode(u8 *buf, int pnl, const char *string,
  72                                            int data_len)
  73 {
  74         int result;
  75         put_unaligned_le32(data_len,
  76                         &buf[USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + pnl]);
  77
  78         result = utf8s_to_utf16s(string, data_len >> 1, UTF16_LITTLE_ENDIAN,
  79                         (wchar_t *) &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl],
  80                         data_len - 2);
  81         if (result < 0)
  82                 return result;
  83
  84         put_unaligned_le16(0,
  85                         &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl + data_len]);
  86
  87         return data_len;
  88 }
  89
  90 #endif /* __U_OS_DESC_H__ */