/*
 * Copyright (c) 2022-2023 HPMicro
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */

#include "usbd_core.h"
#include "usbd_cdc.h"

/*!< endpoint address */
#define CDC_IN_EP  0x81
#define CDC_OUT_EP 0x01
#define CDC_INT_EP 0x83

/*!< config descriptor size */
#define USB_CONFIG_SIZE (9 + CDC_ACM_DESCRIPTOR_LEN)

#ifdef CONFIG_USB_HS
#define CDC_MAX_MPS 512
#else
#define CDC_MAX_MPS 64
#endif

/*!< global descriptor */
static const uint8_t cdc_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0xEF, 0x02, 0x01, USBD_VID, USBD_PID, 0x0100, 0x01),
    USB_CONFIG_DESCRIPTOR_INIT(USB_CONFIG_SIZE, 0x02, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    CDC_ACM_DESCRIPTOR_INIT(0x00, CDC_INT_EP, CDC_OUT_EP, CDC_IN_EP, CDC_MAX_MPS, 0x02),
    /*
     * string0 descriptor
     */
    USB_LANGID_INIT(USBD_LANGID_STRING),
    /*
     * string1 descriptor
     */
    0x14,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    'C', 0x00,                  /* wcChar0 */
    'h', 0x00,                  /* wcChar1 */
    'e', 0x00,                  /* wcChar2 */
    'r', 0x00,                  /* wcChar3 */
    'r', 0x00,                  /* wcChar4 */
    'y', 0x00,                  /* wcChar5 */
    'U', 0x00,                  /* wcChar6 */
    'S', 0x00,                  /* wcChar7 */
    'B', 0x00,                  /* wcChar8 */
    /*
     * string2 descriptor
     */
    0x26,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    'C', 0x00,                  /* wcChar0 */
    'h', 0x00,                  /* wcChar1 */
    'e', 0x00,                  /* wcChar2 */
    'r', 0x00,                  /* wcChar3 */
    'r', 0x00,                  /* wcChar4 */
    'y', 0x00,                  /* wcChar5 */
    'U', 0x00,                  /* wcChar6 */
    'S', 0x00,                  /* wcChar7 */
    'B', 0x00,                  /* wcChar8 */
    ' ', 0x00,                  /* wcChar9 */
    'C', 0x00,                  /* wcChar10 */
    'D', 0x00,                  /* wcChar11 */
    'C', 0x00,                  /* wcChar12 */
    ' ', 0x00,                  /* wcChar13 */
    'D', 0x00,                  /* wcChar14 */
    'E', 0x00,                  /* wcChar15 */
    'M', 0x00,                  /* wcChar16 */
    'O', 0x00,                  /* wcChar17 */
    /*
     * string3 descriptor
     */
    0x16,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    '2', 0x00,                  /* wcChar0 */
    '0', 0x00,                  /* wcChar1 */
    '2', 0x00,                  /* wcChar2 */
    '2', 0x00,                  /* wcChar3 */
    '1', 0x00,                  /* wcChar4 */
    '2', 0x00,                  /* wcChar5 */
    '3', 0x00,                  /* wcChar6 */
    '4', 0x00,                  /* wcChar7 */
    '5', 0x00,                  /* wcChar8 */
    '6', 0x00,                  /* wcChar9 */
#ifdef CONFIG_USB_HS
    /*
     * device qualifier descriptor
     */
    0x0a,
    USB_DESCRIPTOR_TYPE_DEVICE_QUALIFIER,
    0x00,
    0x02,
    0x02,
    0x02,
    0x01,
    0x40,
    0x01,
    0x00,
#endif
    0x00
};

USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t read_buffer[CDC_MAX_MPS];
USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer[2048];
volatile bool dtr_enable;
volatile bool ep_tx_busy_flag;


static void usbd_event_handler(uint8_t busid, uint8_t event)
{
    switch (event) {
    case USBD_EVENT_RESET:
        break;
    case USBD_EVENT_CONNECTED:
        break;
    case USBD_EVENT_DISCONNECTED:
        break;
    case USBD_EVENT_RESUME:
        break;
    case USBD_EVENT_SUSPEND:
        break;
    case USBD_EVENT_CONFIGURED:
        /* setup first out ep read transfer */
        usbd_ep_start_read(busid, CDC_OUT_EP, &read_buffer[0], CDC_MAX_MPS);
        break;
    case USBD_EVENT_SET_REMOTE_WAKEUP:
        break;
    case USBD_EVENT_CLR_REMOTE_WAKEUP:
        break;

    default:
        break;
    }
}

void usbd_cdc_acm_bulk_out(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    USB_LOG_RAW("actual out len:%d\r\n", nbytes);

    usbd_ep_start_read(busid, ep, &read_buffer[0], CDC_MAX_MPS);
    usbd_ep_start_write(busid, CDC_IN_EP, &read_buffer[0], nbytes);
}

void usbd_cdc_acm_bulk_in(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    USB_LOG_RAW("actual in len:%d\r\n", nbytes);

    if ((nbytes % CDC_MAX_MPS) == 0 && nbytes) {
        /* send zlp */
        usbd_ep_start_write(busid, ep, NULL, 0);
    } else {
        ep_tx_busy_flag = false;
    }
}

/*!< endpoint call back */
struct usbd_endpoint cdc_out_ep = {
    .ep_addr = CDC_OUT_EP,
    .ep_cb = usbd_cdc_acm_bulk_out
};

struct usbd_endpoint cdc_in_ep = {
    .ep_addr = CDC_IN_EP,
    .ep_cb = usbd_cdc_acm_bulk_in
};

static struct usbd_interface intf0;
static struct usbd_interface intf1;

/* function ------------------------------------------------------------------*/

void cdc_acm_init(uint8_t busid, uint32_t reg_base)
{
    usbd_desc_register(busid, cdc_descriptor);
    usbd_add_interface(busid, usbd_cdc_acm_init_intf(busid, &intf0));
    usbd_add_interface(busid, usbd_cdc_acm_init_intf(busid, &intf1));
    usbd_add_endpoint(busid, &cdc_out_ep);
    usbd_add_endpoint(busid, &cdc_in_ep);
    usbd_initialize(busid, reg_base, usbd_event_handler);
}

void usbd_cdc_acm_set_dtr(uint8_t busid, uint8_t intf, bool dtr)
{
    (void)busid;
    (void)intf;

    if (dtr) {
        dtr_enable = 1;
    }
}

void cdc_acm_data_send_with_dtr_test(uint8_t busid)
{
    ep_tx_busy_flag = true;
    write_buffer[0] = 'h';
    write_buffer[1] = 'p';
    write_buffer[2] = 'm';
    write_buffer[3] = 'i';
    write_buffer[4] = 'c';
    write_buffer[5] = 'r';
    write_buffer[6] = 'o';
    write_buffer[7] = 0x0D;
    write_buffer[8] = 0x0A;
    memset(&write_buffer[9], 'a', 2037);
    write_buffer[2046] = 0x0D;
    write_buffer[2047] = 0x0A;
    usbd_ep_start_write(busid, CDC_IN_EP, &write_buffer[0], 2048);
    while (ep_tx_busy_flag) {
    }
}