/*
 * 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.
 *
 */

/*
 * Copyright (c) 2021 HPMicro
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */

#include "tusb.h"

/* 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]
 */
#define _PID_MAP(itf, n)  ((CFG_TUD_##itf) << (n))
#define USB_PID           (0x4000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \
                           _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4))

/*--------------------------------------------------------------------*
 * Device Descriptors
 *--------------------------------------------------------------------*/
tusb_desc_device_t const desc_device = {
    .bLength            = sizeof(tusb_desc_device_t),
    .bDescriptorType    = TUSB_DESC_DEVICE,
    .bcdUSB             = 0x0200,

    /* Use Interface Association Descriptor (IAD) for CDC
     * As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
     */
    .bDeviceClass       = TUSB_CLASS_MISC,
    .bDeviceSubClass    = MISC_SUBCLASS_COMMON,
    .bDeviceProtocol    = MISC_PROTOCOL_IAD,

    .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,

    .idVendor           = 0xCafe,
    .idProduct          = USB_PID,
    .bcdDevice          = 0x0100,

    .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;
}

/*--------------------------------------------------------------------*
 * Configuration Descriptor
 *--------------------------------------------------------------------*/

enum {
    ITF_NUM_CDC = 0,
    ITF_NUM_CDC_DATA,
    ITF_NUM_MSC,
    ITF_NUM_TOTAL
};

#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_MSC_DESC_LEN)

#define EPNUM_CDC_NOTIF   0x81
#define EPNUM_CDC_OUT     0x02
#define EPNUM_CDC_IN      0x82

#define EPNUM_MSC_OUT     0x03
#define EPNUM_MSC_IN      0x83

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

    /* Interface number, string index, EP notification address and size, EP data address (out, in) and size. */
    TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),

    /* Interface number, string index, EP Out & EP In address, EP size */
    TUD_MSC_DESCRIPTOR(ITF_NUM_MSC, 5, EPNUM_MSC_OUT, EPNUM_MSC_IN, 64),
};

#if TUD_OPT_HIGH_SPEED
uint8_t const desc_hs_configuration[] = {
    /* Config number, interface count, string index, total length, attribute, power in mA */
    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),

    /* Interface number, string index, EP notification address and size, EP data address (out, in) and size. */
    TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 512),

    /* Interface number, string index, EP Out & EP In address, EP size */
    TUD_MSC_DESCRIPTOR(ITF_NUM_MSC, 5, EPNUM_MSC_OUT, EPNUM_MSC_IN, 512),
};
#endif


/* 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 */

    #if TUD_OPT_HIGH_SPEED
    /* Although we are highspeed, host may be fullspeed. */
    return (tud_speed_get() == TUSB_SPEED_HIGH) ? desc_hs_configuration : desc_fs_configuration;
    #else
    return desc_fs_configuration;
    #endif
}

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

/* array of pointer to string descriptors */
char const *string_desc_arr[] = {
    (const char[]) { 0x09, 0x04 }, /* 0: is supported language is English (0x0409) */
    "TinyUSB",                     /* 1: Manufacturer */
    "TinyUSB Device",              /* 2: Product */
    "123456",                      /* 3: Serials, should use chip ID */
    "TinyUSB CDC",                 /* 4: CDC Interface */
    "TinyUSB MSC",                 /* 5: MSC Interface */
};

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];

        /* Cap at max char */
        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];
        }
    }

    /* first byte is length (including header), second byte is string type */
    _desc_str[0] = (TUSB_DESC_STRING << 8) | (2 * chr_count + 2);

    return _desc_str;
}