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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* WebUSB descriptors and constants
*
* Copyright (C) 2023 Jó Ágila Bitsch <jgilab@gmail.com>
*/
#ifndef __LINUX_USB_WEBUSB_H
#define __LINUX_USB_WEBUSB_H
#include "uapi/linux/usb/ch9.h"
/*
* Little Endian PlatformCapablityUUID for WebUSB
* 3408b638-09a9-47a0-8bfd-a0768815b665
* to identify Platform Device Capability descriptors as referring to WebUSB.
*/
#define WEBUSB_UUID \
GUID_INIT(0x3408b638, 0x09a9, 0x47a0, 0x8b, 0xfd, 0xa0, 0x76, 0x88, 0x15, 0xb6, 0x65)
/*
* WebUSB Platform Capability data
*
* A device announces support for the
* WebUSB command set by including the following Platform Descriptor Data in its
* Binary Object Store associated with the WebUSB_UUID above.
* See: https://wicg.github.io/webusb/#webusb-platform-capability-descriptor
*/
struct usb_webusb_cap_data {
__le16 bcdVersion;
#define WEBUSB_VERSION_1_00 cpu_to_le16(0x0100) /* currently only version 1.00 is defined */
u8 bVendorCode;
u8 iLandingPage;
#define WEBUSB_LANDING_PAGE_NOT_PRESENT 0
#define WEBUSB_LANDING_PAGE_PRESENT 1 /* we chose the fixed index 1 for the URL descriptor */
} __packed;
#define USB_WEBUSB_CAP_DATA_SIZE 4
/*
* Get URL Request
*
* The request to fetch an URL is defined in https://wicg.github.io/webusb/#get-url as:
* bmRequestType: (USB_DIR_IN | USB_TYPE_VENDOR) = 11000000B
* bRequest: bVendorCode
* wValue: iLandingPage
* wIndex: GET_URL = 2
* wLength: Descriptor Length (typically U8_MAX = 255)
* Data: URL Descriptor
*/
#define WEBUSB_GET_URL 2
/*
* This descriptor contains a single URL and is returned by the Get URL request.
*
* See: https://wicg.github.io/webusb/#url-descriptor
*/
struct webusb_url_descriptor {
u8 bLength;
#define WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH 3
u8 bDescriptorType;
#define WEBUSB_URL_DESCRIPTOR_TYPE 3
u8 bScheme;
#define WEBUSB_URL_SCHEME_HTTP 0
#define WEBUSB_URL_SCHEME_HTTPS 1
#define WEBUSB_URL_SCHEME_NONE 255
u8 URL[U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH];
} __packed;
/*
* Buffer size to hold the longest URL that can be in an URL descriptor
*
* The descriptor can be U8_MAX bytes long.
* WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH bytes are used for a header.
* Since the longest prefix that might be stripped is "https://", we may accommodate an additional
* 8 bytes.
*/
#define WEBUSB_URL_RAW_MAX_LENGTH (U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + 8)
#endif /* __LINUX_USB_USBNET_H */