/* usb_cdc.h - USB CDC-ACM and CDC-ECM public header */

/*
 * Copyright (c) 2017 PHYTEC Messtechnik GmbH
 *
 * SPDX-License-Identifier: Apache-2.0
 */


/**
 * @file
 * @brief USB Communications Device Class (CDC) public header
 *
 * Header follows the Class Definitions for
 * Communications Devices Specification (CDC120-20101103-track.pdf),
 * PSTN Devices Specification (PSTN120.pdf) and
 * Ethernet Control Model Devices Specification (ECM120.pdf).
 * Header is limited to ACM and ECM Subclasses.
 */

#pragma once

#include <stdint.h>
#include <sys/cdefs.h>

#ifdef __cplusplus
extern "C" {
#endif

/** CDC Specification release number in BCD format */
#define CDC_SRN_1_20            0x0120

/** Communications Class Subclass Codes */
#define ACM_SUBCLASS            0x02
#define ECM_SUBCLASS            0x06
#define EEM_SUBCLASS            0x0c

/** Communications Class Protocol Codes */
#define AT_CMD_V250_PROTOCOL        0x01
#define EEM_PROTOCOL            0x07

/**
 * @brief Data Class Interface Codes
 * @note CDC120-20101103-track.pdf, 4.5, Table 6
 */
#define DATA_INTERFACE_CLASS        0x0A

/**
 * @brief Values for the bDescriptorType Field
 * @note CDC120-20101103-track.pdf, 5.2.3, Table 12
 */
#define CS_INTERFACE            0x24
#define CS_ENDPOINT         0x25

/**
 * @brief bDescriptor SubType for Communications
 * Class Functional Descriptors
 * @note CDC120-20101103-track.pdf, 5.2.3, Table 13
 */
#define HEADER_FUNC_DESC        0x00
#define CALL_MANAGEMENT_FUNC_DESC   0x01
#define ACM_FUNC_DESC           0x02
#define UNION_FUNC_DESC         0x06
#define ETHERNET_FUNC_DESC      0x0F

/**
 * @brief PSTN Subclass Specific Requests
 * for ACM devices
 * @note PSTN120.pdf, 6.3, Table 13
 */
#define CDC_SEND_ENC_CMD        0x00
#define CDC_GET_ENC_RSP         0x01
#define SET_LINE_CODING         0x20
#define GET_LINE_CODING         0x21
#define SET_CONTROL_LINE_STATE      0x22

/** Control Signal Bitmap Values for SetControlLineState */
#define SET_CONTROL_LINE_STATE_RTS  0x02
#define SET_CONTROL_LINE_STATE_DTR  0x01

/** UART State Bitmap Values */
#define SERIAL_STATE_OVERRUN        0x40
#define SERIAL_STATE_PARITY     0x20
#define SERIAL_STATE_FRAMING        0x10
#define SERIAL_STATE_RING       0x08
#define SERIAL_STATE_BREAK      0x04
#define SERIAL_STATE_TX_CARRIER     0x02
#define SERIAL_STATE_RX_CARRIER     0x01

/**
 * @brief Class-Specific Request Codes for Ethernet subclass
 * @note ECM120.pdf, 6.2, Table 6
 */
#define SET_ETHERNET_MULTICAST_FILTERS  0x40
#define SET_ETHERNET_PM_FILTER      0x41
#define GET_ETHERNET_PM_FILTER      0x42
#define SET_ETHERNET_PACKET_FILTER  0x43
#define GET_ETHERNET_STATISTIC      0x44

/** Ethernet Packet Filter Bitmap */
#define PACKET_TYPE_MULTICAST       0x10
#define PACKET_TYPE_BROADCAST       0x08
#define PACKET_TYPE_DIRECTED        0x04
#define PACKET_TYPE_ALL_MULTICAST   0x02
#define PACKET_TYPE_PROMISCUOUS     0x01

/** Header Functional Descriptor */
struct cdc_header_descriptor {
    uint8_t bFunctionLength;
    uint8_t bDescriptorType;
    uint8_t bDescriptorSubtype;
    uint16_t bcdCDC;
} __packed;

/** Union Interface Functional Descriptor */
struct cdc_union_descriptor {
    uint8_t bFunctionLength;
    uint8_t bDescriptorType;
    uint8_t bDescriptorSubtype;
    uint8_t bControlInterface;
    uint8_t bSubordinateInterface0;
} __packed;

/** Call Management Functional Descriptor */
struct cdc_cm_descriptor {
    uint8_t bFunctionLength;
    uint8_t bDescriptorType;
    uint8_t bDescriptorSubtype;
    uint8_t bmCapabilities;
    uint8_t bDataInterface;
} __packed;

/** Abstract Control Management Functional Descriptor */
struct cdc_acm_descriptor {
    uint8_t bFunctionLength;
    uint8_t bDescriptorType;
    uint8_t bDescriptorSubtype;
    uint8_t bmCapabilities;
} __packed;


/** Data structure for GET_LINE_CODING / SET_LINE_CODING class requests */
struct cdc_acm_line_coding {
    uint32_t dwDTERate;
    uint8_t bCharFormat;
    uint8_t bParityType;
    uint8_t bDataBits;
} __packed;

/** Data structure for the notification about SerialState */
struct cdc_acm_notification {
    uint8_t bmRequestType;
    uint8_t bNotificationType;
    uint16_t wValue;
    uint16_t wIndex;
    uint16_t wLength;
    uint16_t data;
} __packed;

/** Ethernet Networking Functional Descriptor */
struct cdc_ecm_descriptor {
    uint8_t bFunctionLength;
    uint8_t bDescriptorType;
    uint8_t bDescriptorSubtype;
    uint8_t iMACAddress;
    uint32_t bmEthernetStatistics;
    uint16_t wMaxSegmentSize;
    uint16_t wNumberMCFilters;
    uint8_t bNumberPowerFilters;
} __packed;

#ifdef __cplusplus
}
#endif