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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.
*/
/*
* DisplayPort alternate mode support
* Refer to VESA DisplayPort Alt Mode on USB Type-C Standard, version 2.0,
* section 5.2
*/
#ifndef __CROS_EC_USB_DP_ALT_MODE_H
#define __CROS_EC_USB_DP_ALT_MODE_H
#include <stdint.h>
#include "tcpm/tcpm.h"
/*
* Initialize DP state for the specified port.
*
* @param port USB-C port number
*/
void dp_init(int port);
/*
* Returns True if DisplayPort mode is in active state
*
* @param port USB-C port number
* @return True if DisplayPort mode is in active state
* False otherwise
*/
bool dp_is_active(int port);
/*
* Checks whether the mode entry sequence for DisplayPort alternate mode is done
* for a port.
*
* @param port USB-C port number
* @return True if entry sequence for DisplayPort mode is completed
* False otherwise
*/
bool dp_entry_is_done(int port);
/*
* Handles received DisplayPort 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 dp_vdm_acked(int port, enum tcpci_msg_type type, int vdo_count,
uint32_t *vdm);
/*
* Handles NAKed (or Not Supported or timed out) DisplayPort 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 dp_vdm_naked(int port, enum tcpci_msg_type type, uint8_t vdm_cmd);
/*
* Construct the next DisplayPort 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
* @return The number of VDOs written to VDM or -1 to indicate error
*/
int dp_setup_next_vdm(int port, int vdo_count, uint32_t *vdm);
#endif /* __CROS_EC_USB_DP_ALT_MODE_H */
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