include/linux/usb/webusb.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * WebUSB descriptors and constants
   4  *
   5  * Copyright (C) 2023 Jó Ágila Bitsch <jgilab@gmail.com>
   6  */
   7
   8 #ifndef __LINUX_USB_WEBUSB_H
   9 #define __LINUX_USB_WEBUSB_H
  10
  11 #include "uapi/linux/usb/ch9.h"
  12
  13 /*
  14  * Little Endian PlatformCapablityUUID for WebUSB
  15  * 3408b638-09a9-47a0-8bfd-a0768815b665
  16  * to identify Platform Device Capability descriptors as referring to WebUSB.
  17  */
  18 #define WEBUSB_UUID \
  19         GUID_INIT(0x3408b638, 0x09a9, 0x47a0, 0x8b, 0xfd, 0xa0, 0x76, 0x88, 0x15, 0xb6, 0x65)
  20
  21 /*
  22  * WebUSB Platform Capability data
  23  *
  24  * A device announces support for the
  25  * WebUSB command set by including the following Platform Descriptor Data in its
  26  * Binary Object Store associated with the WebUSB_UUID above.
  27  * See: https://wicg.github.io/webusb/#webusb-platform-capability-descriptor
  28  */
  29 struct usb_webusb_cap_data {
  30         __le16 bcdVersion;
  31 #define WEBUSB_VERSION_1_00     cpu_to_le16(0x0100) /* currently only version 1.00 is defined */
  32         u8  bVendorCode;
  33         u8  iLandingPage;
  34 #define WEBUSB_LANDING_PAGE_NOT_PRESENT 0
  35 #define WEBUSB_LANDING_PAGE_PRESENT     1 /* we chose the fixed index 1 for the URL descriptor */
  36 } __packed;
  37
  38 #define USB_WEBUSB_CAP_DATA_SIZE        4
  39
  40 /*
  41  * Get URL Request
  42  *
  43  * The request to fetch an URL is defined in https://wicg.github.io/webusb/#get-url as:
  44  * bmRequestType: (USB_DIR_IN | USB_TYPE_VENDOR) = 11000000B
  45  * bRequest: bVendorCode
  46  * wValue: iLandingPage
  47  * wIndex: GET_URL = 2
  48  * wLength: Descriptor Length (typically U8_MAX = 255)
  49  * Data: URL Descriptor
  50  */
  51 #define WEBUSB_GET_URL 2
  52
  53 /*
  54  * This descriptor contains a single URL and is returned by the Get URL request.
  55  *
  56  * See: https://wicg.github.io/webusb/#url-descriptor
  57  */
  58 struct webusb_url_descriptor {
  59         u8  bLength;
  60 #define WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH     3
  61         u8  bDescriptorType;
  62 #define WEBUSB_URL_DESCRIPTOR_TYPE              3
  63         u8  bScheme;
  64 #define WEBUSB_URL_SCHEME_HTTP                  0
  65 #define WEBUSB_URL_SCHEME_HTTPS                 1
  66 #define WEBUSB_URL_SCHEME_NONE                  255
  67         u8  URL[U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH];
  68 } __packed;
  69
  70 /*
  71  * Buffer size to hold the longest URL that can be in an URL descriptor
  72  *
  73  * The descriptor can be U8_MAX  bytes long.
  74  * WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH bytes are used for a header.
  75  * Since the longest prefix that might be stripped is "https://", we may accommodate an additional
  76  * 8 bytes.
  77  */
  78 #define WEBUSB_URL_RAW_MAX_LENGTH (U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + 8)
  79
  80 #endif /* __LINUX_USB_USBNET_H */