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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* Thunderbolt alternate mode support
* Refer to USB Type-C Cable and Connector Specification Release 2.0 Section F
*/
#ifndef __CROS_EC_USB_TBT_ALT_MODE_H
#define __CROS_EC_USB_TBT_ALT_MODE_H
#include <stdint.h>
#include "tcpm/tcpm.h"
#include "usb_pd_tcpm.h"
/*
* Initialize Thunderbolt state for the specified port.
*
* @param port USB-C port number
*/
void tbt_init(int port);
/*
* Requests to exit the Thunderbolt alternate mode
*
* @param port USB-C port number
*/
void tbt_exit_mode_request(int port);
/*
* Checks whether Thunderbolt cable mode entry is required prior to entering
* USB4.
*
* @param port USB-C port number
* @return True if Thunderbolt cable mode entry is required
* False otherwise
*/
bool tbt_cable_entry_required_for_usb4(int port);
/*
* Checks whether the mode entry sequence for Thunderbolt alternate mode is
* done for a port.
*
* @param port USB-C port number
* @return True if entry sequence for Thunderbolt mode is completed
* False otherwise
*/
bool tbt_entry_is_done(int port);
/*
* Checks if the cable entry into Thunderbolt alternate mode is done
*
* @param port USB-C port number
* @return True if TBT_FLAG_CABLE_ENTRY_DONE is set
* False otherwise
*/
bool tbt_cable_entry_is_done(int port);
/*
* Returns True if Thunderbolt mode is not in inactive state
*
* @param port USB-C port number
* @return True if Thunderbolt mode is not in inactive state
* False otherwise
*/
bool tbt_is_active(int port);
/*
* Handles received Thunderbolt VDM ACKs.
*
* @param port USB-C port number
* @param type Transmit type (SOP, SOP') for received ACK
* @param vdo_count The number of VDOs in the ACK VDM
* @param vdm VDM from ACK
*/
void intel_vdm_acked(int port, enum tcpci_msg_type type, int vdo_count,
uint32_t *vdm);
/*
* Handles NAKed (or Not Supported or timed out) Thunderbolt VDM requests.
*
* @param port USB-C port number
* @param type Transmit type (SOP, SOP') for request
* @param svid The SVID of the request
* @param vdm_cmd The VDM command of the request
*/
void intel_vdm_naked(int port, enum tcpci_msg_type type, uint8_t vdm_cmd);
/*
* Construct the next Thunderbolt VDM that should be sent.
*
* @param port USB-C port number
* @param vdo_count The number of VDOs in vdm; must be at least VDO_MAX_SIZE
* @param vdm The VDM payload to be sent; output; must point to at least
* VDO_MAX_SIZE elements
* @param tx_type Transmit type(SOP, SOP', SOP'') for next VDM to be sent
* @return The number of VDOs written to VDM or -1 to indicate error
*/
int tbt_setup_next_vdm(int port, int vdo_count, uint32_t *vdm,
enum tcpci_msg_type *tx_type);
#endif
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