drivers/usb/gadget/u_os_desc.h
Source file repositories/reference/linux-study-clean/drivers/usb/gadget/u_os_desc.h
File Facts
- System
- Linux kernel
- Corpus path
drivers/usb/gadget/u_os_desc.h- Extension
.h- Size
- 3097 bytes
- Lines
- 121
- Domain
- Driver Families
- Bucket
- drivers/usb
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
Dependency Surface
linux/unaligned.hlinux/nls.h
Detected Declarations
function Copyrightfunction usb_ext_prop_put_sizefunction usb_ext_prop_put_typefunction usb_ext_prop_put_namefunction usb_ext_prop_put_binaryfunction usb_ext_prop_put_unicode
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/*
* u_os_desc.h
*
* Utility definitions for "OS Descriptors" support
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#ifndef __U_OS_DESC_H__
#define __U_OS_DESC_H__
#include <linux/unaligned.h>
#include <linux/nls.h>
#define USB_EXT_PROP_DW_SIZE 0
#define USB_EXT_PROP_DW_PROPERTY_DATA_TYPE 4
#define USB_EXT_PROP_W_PROPERTY_NAME_LENGTH 8
#define USB_EXT_PROP_B_PROPERTY_NAME 10
#define USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH 10
#define USB_EXT_PROP_B_PROPERTY_DATA 14
#define USB_EXT_PROP_RESERVED 0
#define USB_EXT_PROP_UNICODE 1
#define USB_EXT_PROP_UNICODE_ENV 2
#define USB_EXT_PROP_BINARY 3
#define USB_EXT_PROP_LE32 4
#define USB_EXT_PROP_BE32 5
#define USB_EXT_PROP_UNICODE_LINK 6
#define USB_EXT_PROP_UNICODE_MULTI 7
static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset)
{
return buf + offset;
}
static inline u8 *usb_ext_prop_size_ptr(u8 *buf)
{
return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_SIZE);
}
static inline u8 *usb_ext_prop_type_ptr(u8 *buf)
{
return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_PROPERTY_DATA_TYPE);
}
static inline u8 *usb_ext_prop_name_len_ptr(u8 *buf)
{
return __usb_ext_prop_ptr(buf, USB_EXT_PROP_W_PROPERTY_NAME_LENGTH);
}
static inline u8 *usb_ext_prop_name_ptr(u8 *buf)
{
return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_NAME);
}
static inline u8 *usb_ext_prop_data_len_ptr(u8 *buf, size_t off)
{
return __usb_ext_prop_ptr(buf,
USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + off);
}
static inline u8 *usb_ext_prop_data_ptr(u8 *buf, size_t off)
{
return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_DATA + off);
}
static inline void usb_ext_prop_put_size(u8 *buf, int dw_size)
{
put_unaligned_le32(dw_size, usb_ext_prop_size_ptr(buf));
}
static inline void usb_ext_prop_put_type(u8 *buf, int type)
{
put_unaligned_le32(type, usb_ext_prop_type_ptr(buf));
}
static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
{
int result;
put_unaligned_le16(pnl, usb_ext_prop_name_len_ptr(buf));
result = utf8s_to_utf16s(name, strlen(name), UTF16_LITTLE_ENDIAN,
(wchar_t *) usb_ext_prop_name_ptr(buf), pnl - 2);
if (result < 0)
return result;
Annotation
- Immediate include surface: `linux/unaligned.h`, `linux/nls.h`.
- Detected declarations: `function Copyright`, `function usb_ext_prop_put_size`, `function usb_ext_prop_put_type`, `function usb_ext_prop_put_name`, `function usb_ext_prop_put_binary`, `function usb_ext_prop_put_unicode`.
- Atlas domain: Driver Families / drivers/usb.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.