pico-keys-sdk/src/usb/hid/usb_descriptors.c

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include "tusb.h"
#include "ctap_hid.h"
#include "pico/unique_id.h"
#include "hsm_version.h"

#ifndef USB_VID
#define USB_VID   0xFEFF
#endif
#ifndef USB_PID
#define USB_PID   0xFCFD
#endif

/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug.
 * Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC.
 *
 * Auto ProductID layout's Bitmap:
 *   [MSB]         HID | MSC | CDC          [LSB]
 */


//--------------------------------------------------------------------+
// Device Descriptors
//--------------------------------------------------------------------+
tusb_desc_device_t const desc_device =
{
    .bLength            = sizeof(tusb_desc_device_t),
    .bDescriptorType    = TUSB_DESC_DEVICE,
    .bcdUSB             = 0x0200,
    .bDeviceClass       = 0x00,
    .bDeviceSubClass    = 0x00,
    .bDeviceProtocol    = 0x00,
    .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,

    .idVendor           = (USB_VID),
    .idProduct          = (USB_PID),
    .bcdDevice          = HSM_SDK_VERSION,

    .iManufacturer      = 0x01,
    .iProduct           = 0x02,
    .iSerialNumber      = 0x03,

    .bNumConfigurations = 0x01
};

// Invoked when received GET DEVICE DESCRIPTOR
// Application return pointer to descriptor
uint8_t const * tud_descriptor_device_cb(void)
{
  return (uint8_t const *) &desc_device;
}

//--------------------------------------------------------------------+
// HID Report Descriptor
//--------------------------------------------------------------------+

#define TUD_HID_REPORT_DESC_CTAP(report_size, ...) \
    HID_USAGE_PAGE_N ( FIDO_USAGE_PAGE, 2   ),\
    HID_USAGE        ( FIDO_USAGE_CTAPHID   ),\
    HID_COLLECTION   ( HID_COLLECTION_APPLICATION ),\
      /* Report ID if any */\
      __VA_ARGS__ \
      /* Input */ \
      HID_USAGE       ( FIDO_USAGE_DATA_IN                     ),\
      HID_LOGICAL_MIN ( 0x00                                   ),\
      HID_LOGICAL_MAX_N ( 0xff, 2                              ),\
      HID_REPORT_SIZE ( 8                                      ),\
      HID_REPORT_COUNT( report_size                            ),\
      HID_INPUT       ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE ),\
      /* Output */ \
      HID_USAGE       ( FIDO_USAGE_DATA_OUT                     ),\
      HID_LOGICAL_MIN ( 0x00                                    ),\
      HID_LOGICAL_MAX_N ( 0xff, 2                               ),\
      HID_REPORT_SIZE ( 8                                       ),\
      HID_REPORT_COUNT( report_size                             ),\
      HID_OUTPUT      ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE  ),\
    HID_COLLECTION_END \

uint8_t const desc_hid_report[] =
{
  TUD_HID_REPORT_DESC_CTAP(CFG_TUD_HID_EP_BUFSIZE)
};

// Invoked when received GET HID REPORT DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
uint8_t const * tud_hid_descriptor_report_cb(uint8_t itf)
{
  printf("report_cb %d\n", itf);
  return desc_hid_report;
}

//--------------------------------------------------------------------+
// Configuration Descriptor
//--------------------------------------------------------------------+

enum
{
  ITF_NUM_HID,
  ITF_NUM_TOTAL
};

#define  CONFIG_TOTAL_LEN  (TUD_CONFIG_DESC_LEN + TUD_HID_INOUT_DESC_LEN)

#define EPNUM_HID   0x01

uint8_t const desc_configuration[] =
{
  // Config number, interface count, string index, total length, attribute, power in mA
  TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),

  // Interface number, string index, protocol, report descriptor len, EP In & Out address, size & polling interval
  TUD_HID_INOUT_DESCRIPTOR(ITF_NUM_HID, 0, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report), EPNUM_HID, 0x80 | EPNUM_HID, CFG_TUD_HID_EP_BUFSIZE, 10)
};

// Invoked when received GET CONFIGURATION DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
{
  (void) index; // for multiple configurations
  return desc_configuration;
}

//--------------------------------------------------------------------+
// String Descriptors
//--------------------------------------------------------------------+

// array of pointer to string descriptors
char const* string_desc_arr [] =
{
  (const char[]) { 0x09, 0x04 }, // 0: is supported language is English (0x0409)
  "Pol Henarejos",                     // 1: Manufacturer
  "Pico HSM HID",              // 2: Product
  "123456",                      // 3: Serials, should use chip ID
};

static uint16_t _desc_str[32];

// Invoked when received GET STRING DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
{
    (void) langid;

    uint8_t chr_count;

    if (index == 0) {
        memcpy(&_desc_str[1], string_desc_arr[0], 2);
        chr_count = 1;
    }
    else  {
        // Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors.
        // https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors

        if ( !(index < sizeof(string_desc_arr)/sizeof(string_desc_arr[0])) )
            return NULL;

        const char* str = string_desc_arr[index];
        char unique_id_str[2 * PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1];
        if (index == 3) {
            pico_unique_board_id_t unique_id;
            pico_get_unique_board_id(&unique_id);
            pico_get_unique_board_id_string(unique_id_str, 2 * PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1);
            str = unique_id_str;
        }

        chr_count = strlen(str);
        if ( chr_count > 31 )
            chr_count = 31;

        // Convert ASCII string into UTF-16
        for(uint8_t i=0; i<chr_count; i++) {
            _desc_str[1+i] = str[i];
        }
    }

    _desc_str[0] = (TUSB_DESC_STRING << 8 ) | (2*chr_count + 2);

    return _desc_str;
}