tinyUSB/src/class/cdc/cdc.h

/*
 * 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.
 *
 * This file is part of the TinyUSB stack.
 */

/** \ingroup group_class
 *  \defgroup ClassDriver_CDC Communication Device Class (CDC)
 *            Currently only Abstract Control Model subclass is supported
 *  @{ */

#ifndef _TUSB_CDC_H__
#define _TUSB_CDC_H__

#include "common/tusb_common.h"

#ifdef __cplusplus
 extern "C" {
#endif

/** \defgroup ClassDriver_CDC_Common Common Definitions
 *  @{ */

//--------------------------------------------------------------------+
// CDC Communication Interface Class
//--------------------------------------------------------------------+

/// Communication Interface Subclass Codes
typedef enum
{
  CDC_COMM_SUBCLASS_DIRECT_LINE_CONTROL_MODEL      = 0x01 , ///< Direct Line Control Model         [USBPSTN1.2]
  CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL         = 0x02 , ///< Abstract Control Model            [USBPSTN1.2]
  CDC_COMM_SUBCLASS_TELEPHONE_CONTROL_MODEL        = 0x03 , ///< Telephone Control Model           [USBPSTN1.2]
  CDC_COMM_SUBCLASS_MULTICHANNEL_CONTROL_MODEL     = 0x04 , ///< Multi-Channel Control Model       [USBISDN1.2]
  CDC_COMM_SUBCLASS_CAPI_CONTROL_MODEL             = 0x05 , ///< CAPI Control Model                [USBISDN1.2]
  CDC_COMM_SUBCLASS_ETHERNET_CONTROL_MODEL         = 0x06 , ///< Ethernet Networking Control Model [USBECM1.2]
  CDC_COMM_SUBCLASS_ATM_NETWORKING_CONTROL_MODEL   = 0x07 , ///< ATM Networking Control Model      [USBATM1.2]
  CDC_COMM_SUBCLASS_WIRELESS_HANDSET_CONTROL_MODEL = 0x08 , ///< Wireless Handset Control Model    [USBWMC1.1]
  CDC_COMM_SUBCLASS_DEVICE_MANAGEMENT              = 0x09 , ///< Device Management                 [USBWMC1.1]
  CDC_COMM_SUBCLASS_MOBILE_DIRECT_LINE_MODEL       = 0x0A , ///< Mobile Direct Line Model          [USBWMC1.1]
  CDC_COMM_SUBCLASS_OBEX                           = 0x0B , ///< OBEX                              [USBWMC1.1]
  CDC_COMM_SUBCLASS_ETHERNET_EMULATION_MODEL       = 0x0C , ///< Ethernet Emulation Model          [USBEEM1.0]
  CDC_COMM_SUBCLASS_NETWORK_CONTROL_MODEL          = 0x0D   ///< Network Control Model             [USBNCM1.0]
} cdc_comm_sublcass_type_t;

/// Communication Interface Protocol Codes
typedef enum
{
  CDC_COMM_PROTOCOL_NONE                          = 0x00 , ///< No specific protocol
  CDC_COMM_PROTOCOL_ATCOMMAND                     = 0x01 , ///< AT Commands: V.250 etc
  CDC_COMM_PROTOCOL_ATCOMMAND_PCCA_101            = 0x02 , ///< AT Commands defined by PCCA-101
  CDC_COMM_PROTOCOL_ATCOMMAND_PCCA_101_AND_ANNEXO = 0x03 , ///< AT Commands defined by PCCA-101 & Annex O
  CDC_COMM_PROTOCOL_ATCOMMAND_GSM_707             = 0x04 , ///< AT Commands defined by GSM 07.07
  CDC_COMM_PROTOCOL_ATCOMMAND_3GPP_27007          = 0x05 , ///< AT Commands defined by 3GPP 27.007
  CDC_COMM_PROTOCOL_ATCOMMAND_CDMA                = 0x06 , ///< AT Commands defined by TIA for CDMA
  CDC_COMM_PROTOCOL_ETHERNET_EMULATION_MODEL      = 0x07   ///< Ethernet Emulation Model
} cdc_comm_protocol_type_t;

//------------- SubType Descriptor in COMM Functional Descriptor -------------//
/// Communication Interface SubType Descriptor
typedef enum
{
  CDC_FUNC_DESC_HEADER                                           = 0x00 , ///< Header Functional Descriptor, which marks the beginning of the concatenated set of functional descriptors for the interface.
  CDC_FUNC_DESC_CALL_MANAGEMENT                                  = 0x01 , ///< Call Management Functional Descriptor.
  CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT                      = 0x02 , ///< Abstract Control Management Functional Descriptor.
  CDC_FUNC_DESC_DIRECT_LINE_MANAGEMENT                           = 0x03 , ///< Direct Line Management Functional Descriptor.
  CDC_FUNC_DESC_TELEPHONE_RINGER                                 = 0x04 , ///< Telephone Ringer Functional Descriptor.
  CDC_FUNC_DESC_TELEPHONE_CALL_AND_LINE_STATE_REPORTING_CAPACITY = 0x05 , ///< Telephone Call and Line State Reporting Capabilities Functional Descriptor.
  CDC_FUNC_DESC_UNION                                            = 0x06 , ///< Union Functional Descriptor
  CDC_FUNC_DESC_COUNTRY_SELECTION                                = 0x07 , ///< Country Selection Functional Descriptor
  CDC_FUNC_DESC_TELEPHONE_OPERATIONAL_MODES                      = 0x08 , ///< Telephone Operational ModesFunctional Descriptor
  CDC_FUNC_DESC_USB_TERMINAL                                     = 0x09 , ///< USB Terminal Functional Descriptor
  CDC_FUNC_DESC_NETWORK_CHANNEL_TERMINAL                         = 0x0A , ///< Network Channel Terminal Descriptor
  CDC_FUNC_DESC_PROTOCOL_UNIT                                    = 0x0B , ///< Protocol Unit Functional Descriptor
  CDC_FUNC_DESC_EXTENSION_UNIT                                   = 0x0C , ///< Extension Unit Functional Descriptor
  CDC_FUNC_DESC_MULTICHANEL_MANAGEMENT                           = 0x0D , ///< Multi-Channel Management Functional Descriptor
  CDC_FUNC_DESC_CAPI_CONTROL_MANAGEMENT                          = 0x0E , ///< CAPI Control Management Functional Descriptor
  CDC_FUNC_DESC_ETHERNET_NETWORKING                              = 0x0F , ///< Ethernet Networking Functional Descriptor
  CDC_FUNC_DESC_ATM_NETWORKING                                   = 0x10 , ///< ATM Networking Functional Descriptor
  CDC_FUNC_DESC_WIRELESS_HANDSET_CONTROL_MODEL                   = 0x11 , ///< Wireless Handset Control Model Functional Descriptor
  CDC_FUNC_DESC_MOBILE_DIRECT_LINE_MODEL                         = 0x12 , ///< Mobile Direct Line Model Functional Descriptor
  CDC_FUNC_DESC_MOBILE_DIRECT_LINE_MODEL_DETAIL                  = 0x13 , ///< MDLM Detail Functional Descriptor
  CDC_FUNC_DESC_DEVICE_MANAGEMENT_MODEL                          = 0x14 , ///< Device Management Model Functional Descriptor
  CDC_FUNC_DESC_OBEX                                             = 0x15 , ///< OBEX Functional Descriptor
  CDC_FUNC_DESC_COMMAND_SET                                      = 0x16 , ///< Command Set Functional Descriptor
  CDC_FUNC_DESC_COMMAND_SET_DETAIL                               = 0x17 , ///< Command Set Detail Functional Descriptor
  CDC_FUNC_DESC_TELEPHONE_CONTROL_MODEL                          = 0x18 , ///< Telephone Control Model Functional Descriptor
  CDC_FUNC_DESC_OBEX_SERVICE_IDENTIFIER                          = 0x19 , ///< OBEX Service Identifier Functional Descriptor
  CDC_FUNC_DESC_NCM                                              = 0x1A , ///< NCM Functional Descriptor
}cdc_func_desc_type_t;

//--------------------------------------------------------------------+
// CDC Data Interface Class
//--------------------------------------------------------------------+

// SUBCLASS code of Data Interface is not used and should/must be zero

// Data Interface Protocol Codes
typedef enum{
  CDC_DATA_PROTOCOL_ISDN_BRI                               = 0x30, ///< Physical interface protocol for ISDN BRI
  CDC_DATA_PROTOCOL_HDLC                                   = 0x31, ///< HDLC
  CDC_DATA_PROTOCOL_TRANSPARENT                            = 0x32, ///< Transparent
  CDC_DATA_PROTOCOL_Q921_MANAGEMENT                        = 0x50, ///< Management protocol for Q.921 data link protocol
  CDC_DATA_PROTOCOL_Q921_DATA_LINK                         = 0x51, ///< Data link protocol for Q.931
  CDC_DATA_PROTOCOL_Q921_TEI_MULTIPLEXOR                   = 0x52, ///< TEI-multiplexor for Q.921 data link protocol
  CDC_DATA_PROTOCOL_V42BIS_DATA_COMPRESSION                = 0x90, ///< Data compression procedures
  CDC_DATA_PROTOCOL_EURO_ISDN                              = 0x91, ///< Euro-ISDN protocol control
  CDC_DATA_PROTOCOL_V24_RATE_ADAPTION_TO_ISDN              = 0x92, ///< V.24 rate adaptation to ISDN
  CDC_DATA_PROTOCOL_CAPI_COMMAND                           = 0x93, ///< CAPI Commands
  CDC_DATA_PROTOCOL_HOST_BASED_DRIVER                      = 0xFD, ///< Host based driver. Note: This protocol code should only be used in messages between host and device to identify the host driver portion of a protocol stack.
  CDC_DATA_PROTOCOL_IN_PROTOCOL_UNIT_FUNCTIONAL_DESCRIPTOR = 0xFE  ///< The protocol(s) are described using a ProtocolUnit Functional Descriptors on Communications Class Interface
}cdc_data_protocol_type_t;

//--------------------------------------------------------------------+
// Management Element Request (Control Endpoint)
//--------------------------------------------------------------------+

/// Communication Interface Management Element Request Codes
typedef enum {
  CDC_REQUEST_SEND_ENCAPSULATED_COMMAND                    = 0x00, ///< is used to issue a command in the format of the supported control protocol of the Communications Class interface
  CDC_REQUEST_GET_ENCAPSULATED_RESPONSE                    = 0x01, ///< is used to request a response in the format of the supported control protocol of the Communications Class interface.
  CDC_REQUEST_SET_COMM_FEATURE                             = 0x02,
  CDC_REQUEST_GET_COMM_FEATURE                             = 0x03,
  CDC_REQUEST_CLEAR_COMM_FEATURE                           = 0x04,

  CDC_REQUEST_SET_AUX_LINE_STATE                           = 0x10,
  CDC_REQUEST_SET_HOOK_STATE                               = 0x11,
  CDC_REQUEST_PULSE_SETUP                                  = 0x12,
  CDC_REQUEST_SEND_PULSE                                   = 0x13,
  CDC_REQUEST_SET_PULSE_TIME                               = 0x14,
  CDC_REQUEST_RING_AUX_JACK                                = 0x15,

  CDC_REQUEST_SET_LINE_CODING                              = 0x20,
  CDC_REQUEST_GET_LINE_CODING                              = 0x21,
  CDC_REQUEST_SET_CONTROL_LINE_STATE                       = 0x22,
  CDC_REQUEST_SEND_BREAK                                   = 0x23,

  CDC_REQUEST_SET_RINGER_PARMS                             = 0x30,
  CDC_REQUEST_GET_RINGER_PARMS                             = 0x31,
  CDC_REQUEST_SET_OPERATION_PARMS                          = 0x32,
  CDC_REQUEST_GET_OPERATION_PARMS                          = 0x33,
  CDC_REQUEST_SET_LINE_PARMS                               = 0x34,
  CDC_REQUEST_GET_LINE_PARMS                               = 0x35,
  CDC_REQUEST_DIAL_DIGITS                                  = 0x36,
  CDC_REQUEST_SET_UNIT_PARAMETER                           = 0x37,
  CDC_REQUEST_GET_UNIT_PARAMETER                           = 0x38,
  CDC_REQUEST_CLEAR_UNIT_PARAMETER                         = 0x39,
  CDC_REQUEST_GET_PROFILE                                  = 0x3A,

  CDC_REQUEST_SET_ETHERNET_MULTICAST_FILTERS               = 0x40,
  CDC_REQUEST_SET_ETHERNET_POWER_MANAGEMENT_PATTERN_FILTER = 0x41,
  CDC_REQUEST_GET_ETHERNET_POWER_MANAGEMENT_PATTERN_FILTER = 0x42,
  CDC_REQUEST_SET_ETHERNET_PACKET_FILTER                   = 0x43,
  CDC_REQUEST_GET_ETHERNET_STATISTIC                       = 0x44,

  CDC_REQUEST_SET_ATM_DATA_FORMAT                          = 0x50,
  CDC_REQUEST_GET_ATM_DEVICE_STATISTICS                    = 0x51,
  CDC_REQUEST_SET_ATM_DEFAULT_VC                           = 0x52,
  CDC_REQUEST_GET_ATM_VC_STATISTICS                        = 0x53,

  CDC_REQUEST_MDLM_SEMANTIC_MODEL                          = 0x60,
} cdc_management_request_t;

typedef enum {
  CDC_CONTROL_LINE_STATE_DTR = 0x01,
  CDC_CONTROL_LINE_STATE_RTS = 0x02,
} cdc_control_line_state_t;

typedef enum {
  CDC_LINE_CODING_STOP_BITS_1   = 0, // 1   bit
  CDC_LINE_CODING_STOP_BITS_1_5 = 1, // 1.5 bits
  CDC_LINE_CODING_STOP_BITS_2   = 2, // 2   bits
} cdc_line_coding_stopbits_t;

// TODO Backward compatible for typos. Maybe removed in the future release
#define CDC_LINE_CONDING_STOP_BITS_1   CDC_LINE_CODING_STOP_BITS_1
#define CDC_LINE_CONDING_STOP_BITS_1_5 CDC_LINE_CODING_STOP_BITS_1_5
#define CDC_LINE_CONDING_STOP_BITS_2   CDC_LINE_CODING_STOP_BITS_2

typedef enum {
  CDC_LINE_CODING_PARITY_NONE  = 0,
  CDC_LINE_CODING_PARITY_ODD   = 1,
  CDC_LINE_CODING_PARITY_EVEN  = 2,
  CDC_LINE_CODING_PARITY_MARK  = 3,
  CDC_LINE_CODING_PARITY_SPACE = 4,
} cdc_line_coding_parity_t;

//--------------------------------------------------------------------+
// Management Element Notification (Notification Endpoint)
//--------------------------------------------------------------------+

/// 6.3 Notification Codes
typedef enum {
  CDC_NOTIF_NETWORK_CONNECTION               = 0x00, ///< This notification allows the device to notify the host about network connection status.
  CDC_NOTIF_RESPONSE_AVAILABLE               = 0x01, ///< This notification allows the device to notify the hostthat a response is available. This response can be retrieved with a subsequent \ref CDC_REQUEST_GET_ENCAPSULATED_RESPONSE request.
  CDC_NOTIF_AUX_JACK_HOOK_STATE              = 0x08,
  CDC_NOTIF_RING_DETECT                      = 0x09,
  CDC_NOTIF_SERIAL_STATE                     = 0x20,
  CDC_NOTIF_CALL_STATE_CHANGE                = 0x28,
  CDC_NOTIF_LINE_STATE_CHANGE                = 0x29,
  CDC_NOTIF_CONNECTION_SPEED_CHANGE          = 0x2A, ///< This notification allows the device to inform the host-networking driver that a change in either the upstream or the downstream bit rate of the connection has occurred
  CDC_NOTIF_MDLM_SEMANTIC_MODEL_NOTIFICATION = 0x40,
}cdc_notification_request_t;

//--------------------------------------------------------------------+
// Class Specific Functional Descriptor (Communication Interface)
//--------------------------------------------------------------------+

// Start of all packed definitions for compiler without per-type packed
TU_ATTR_PACKED_BEGIN
TU_ATTR_BIT_FIELD_ORDER_BEGIN

/// Header Functional Descriptor (Communication Interface)
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength            ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType ; ///< Descriptor SubType one of above CDC_FUNC_DESC_
  uint16_t bcdCDC            ; ///< CDC release number in Binary-Coded Decimal
}cdc_desc_func_header_t;

/// Union Functional Descriptor (Communication Interface)
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength                  ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType          ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType       ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  uint8_t bControlInterface        ; ///< Interface number of Communication Interface
  uint8_t bSubordinateInterface    ; ///< Array of Interface number of Data Interface
}cdc_desc_func_union_t;

#define cdc_desc_func_union_n_t(no_slave)\
 struct TU_ATTR_PACKED {                   \
  uint8_t bLength                         ;\
  uint8_t bDescriptorType                 ;\
  uint8_t bDescriptorSubType              ;\
  uint8_t bControlInterface               ;\
  uint8_t bSubordinateInterface[no_slave] ;\
}

/// Country Selection Functional Descriptor (Communication Interface)
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength             ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType     ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType  ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  uint8_t iCountryCodeRelDate ; ///< Index of a string giving the release date for the implemented ISO 3166 Country Codes.
  uint16_t wCountryCode       ; ///< Country code in the format as defined in [ISO3166], release date as specified inoffset 3 for the first supported country.
}cdc_desc_func_country_selection_t;

#define cdc_desc_func_country_selection_n_t(no_country) \
  struct TU_ATTR_PACKED {            \
  uint8_t bLength                   ;\
  uint8_t bDescriptorType           ;\
  uint8_t bDescriptorSubType        ;\
  uint8_t iCountryCodeRelDate       ;\
  uint16_t wCountryCode[no_country] ;\
}

//--------------------------------------------------------------------+
// PUBLIC SWITCHED TELEPHONE NETWORK (PSTN) SUBCLASS
//--------------------------------------------------------------------+

/// \brief Call Management Functional Descriptor
/// \details This functional descriptor describes the processing of calls for the Communications Class interface.
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength            ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType ; ///< Descriptor SubType one of above CDC_FUCN_DESC_

  struct {
    uint8_t handle_call    : 1; ///< 0 - Device sends/receives call management information only over the Communications Class interface. 1 - Device can send/receive call management information over a Data Class interface.
    uint8_t send_recv_call : 1; ///< 0 - Device does not handle call management itself. 1 - Device handles call management itself.
    uint8_t TU_RESERVED    : 6;
  } bmCapabilities;

  uint8_t bDataInterface;
}cdc_desc_func_call_management_t;

typedef struct TU_ATTR_PACKED
{
  uint8_t support_comm_request                    : 1; ///< Device supports the request combination of Set_Comm_Feature, Clear_Comm_Feature, and Get_Comm_Feature.
  uint8_t support_line_request                    : 1; ///< Device supports the request combination of Set_Line_Coding, Set_Control_Line_State, Get_Line_Coding, and the notification Serial_State.
  uint8_t support_send_break                      : 1; ///< Device supports the request Send_Break
  uint8_t support_notification_network_connection : 1; ///< Device supports the notification Network_Connection.
  uint8_t TU_RESERVED                             : 4;
}cdc_acm_capability_t;

TU_VERIFY_STATIC(sizeof(cdc_acm_capability_t) == 1, "mostly problem with compiler");

/// Abstract Control Management Functional Descriptor
/// This functional descriptor describes the commands supported by by the Communications Class interface with SubClass code of \ref CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength                  ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType          ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType       ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  cdc_acm_capability_t bmCapabilities ;
}cdc_desc_func_acm_t;

/// \brief Direct Line Management Functional Descriptor
/// \details This functional descriptor describes the commands supported by the Communications Class interface with SubClass code of \ref CDC_FUNC_DESC_DIRECT_LINE_MANAGEMENT
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength            ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  struct {
    uint8_t require_pulse_setup   : 1; ///< Device requires extra Pulse_Setup request during pulse dialing sequence to disengage holding circuit.
    uint8_t support_aux_request   : 1; ///< Device supports the request combination of Set_Aux_Line_State, Ring_Aux_Jack, and notification Aux_Jack_Hook_State.
    uint8_t support_pulse_request : 1; ///< Device supports the request combination of Pulse_Setup, Send_Pulse, and Set_Pulse_Time.
    uint8_t TU_RESERVED           : 5;
  } bmCapabilities;
}cdc_desc_func_direct_line_management_t;

/// \brief Telephone Ringer Functional Descriptor
/// \details The Telephone Ringer functional descriptor describes the ringer capabilities supported by the Communications Class interface,
/// with the SubClass code of \ref CDC_COMM_SUBCLASS_TELEPHONE_CONTROL_MODEL
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength            ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  uint8_t bRingerVolSteps    ;
  uint8_t bNumRingerPatterns ;
}cdc_desc_func_telephone_ringer_t;

/// \brief Telephone Operational Modes Functional Descriptor
/// \details The Telephone Operational Modes functional descriptor describes the operational modes supported by
/// the Communications Class interface, with the SubClass code of \ref CDC_COMM_SUBCLASS_TELEPHONE_CONTROL_MODEL
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength            ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  struct {
    uint8_t simple_mode           : 1;
    uint8_t standalone_mode       : 1;
    uint8_t computer_centric_mode : 1;
    uint8_t TU_RESERVED           : 5;
  } bmCapabilities;
}cdc_desc_func_telephone_operational_modes_t;

/// \brief Telephone Call and Line State Reporting Capabilities Descriptor
/// \details The Telephone Call and Line State Reporting Capabilities functional descriptor describes the abilities of a
/// telephone device to report optional call and line states.
typedef struct TU_ATTR_PACKED
{
  uint8_t bLength            ; ///< Size of this descriptor in bytes.
  uint8_t bDescriptorType    ; ///< Descriptor Type, must be Class-Specific
  uint8_t bDescriptorSubType ; ///< Descriptor SubType one of above CDC_FUCN_DESC_
  struct {
    uint32_t interrupted_dialtone   : 1; ///< 0 : Reports only dialtone (does not differentiate between normal and interrupted dialtone). 1 : Reports interrupted dialtone in addition to normal dialtone
    uint32_t ringback_busy_fastbusy : 1; ///< 0 : Reports only dialing state. 1 : Reports ringback, busy, and fast busy states.
    uint32_t caller_id              : 1; ///< 0 : Does not report caller ID. 1 : Reports caller ID information.
    uint32_t incoming_distinctive   : 1; ///< 0 : Reports only incoming ringing. 1 : Reports incoming distinctive ringing patterns.
    uint32_t dual_tone_multi_freq   : 1; ///< 0 : Cannot report dual tone multi-frequency (DTMF) digits input remotely over the telephone line. 1 : Can report DTMF digits input remotely over the telephone line.
    uint32_t line_state_change      : 1; ///< 0 : Does not support line state change notification. 1 : Does support line state change notification
    uint32_t TU_RESERVED0           : 2;
    uint32_t TU_RESERVED1           : 16;
    uint32_t TU_RESERVED2           : 8;
  } bmCapabilities;
}cdc_desc_func_telephone_call_state_reporting_capabilities_t;

// TODO remove
static inline uint8_t cdc_functional_desc_typeof(uint8_t const * p_desc)
{
  return p_desc[2];
}

//--------------------------------------------------------------------+
// Requests
//--------------------------------------------------------------------+
typedef struct TU_ATTR_PACKED
{
  uint32_t bit_rate;
  uint8_t  stop_bits; ///< 0: 1 stop bit - 1: 1.5 stop bits - 2: 2 stop bits
  uint8_t  parity;    ///< 0: None - 1: Odd - 2: Even - 3: Mark - 4: Space
  uint8_t  data_bits; ///< can be 5, 6, 7, 8 or 16
} cdc_line_coding_t;

TU_VERIFY_STATIC(sizeof(cdc_line_coding_t) == 7, "size is not correct");

typedef struct TU_ATTR_PACKED
{
  uint16_t dtr : 1;
  uint16_t rts : 1;
  uint16_t : 6;
  uint16_t : 8;
} cdc_line_control_state_t;

TU_VERIFY_STATIC(sizeof(cdc_line_control_state_t) == 2, "size is not correct");

TU_ATTR_PACKED_END  // End of all packed definitions
TU_ATTR_BIT_FIELD_ORDER_END

#ifdef __cplusplus
 }
#endif

#endif

/** @} */