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The TCPCI specification defines ane optional register 18h 'CONFIG_STANDARD_OUTPUT' providing a standardized way of steering the high-speed muxes. Implement the feature as a usb_mux_driver, under the conditional flag CONFIG_USB_PD_TCPM_MUX. The USB PD port index should be set in the port_addr field of the 'usb_mux' structure. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chrome-os-partner:49605 TEST=run pdeval-stm32f072 connected to a Parade PS8751 board and test USB/DP muxing. Change-Id: I7e5f0b8ec70b1910b2cff9d106514baca8c899e5 Reviewed-on: https://chromium-review.googlesource.com/322956 Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* USB mux driver */
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#ifndef __CROS_EC_USB_MUX_H
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#define __CROS_EC_USB_MUX_H
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#include "usb_charge.h"
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#include "usb_pd.h"
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/* USB-C mux state */
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typedef uint8_t mux_state_t;
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/* Mux state attributes */
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#define MUX_USB_ENABLED (1 << 0) /* USB is enabled */
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#define MUX_DP_ENABLED (1 << 1) /* DP is enabled */
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#define MUX_POLARITY_INVERTED (1 << 2) /* Polarity is inverted */
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/* Mux modes, decoded to attributes */
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enum typec_mux {
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TYPEC_MUX_NONE = 0, /* Open switch */
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TYPEC_MUX_USB = MUX_USB_ENABLED, /* USB only */
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TYPEC_MUX_DP = MUX_DP_ENABLED, /* DP only */
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TYPEC_MUX_DOCK = MUX_USB_ENABLED | /* Both USB and DP */
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MUX_DP_ENABLED,
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};
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/* Mux driver function pointers */
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struct usb_mux_driver {
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/**
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* Initialize USB mux.
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*
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* @param port_addr Port/address driver-defined parameter.
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* @return EC_SUCCESS on success, non-zero error code on failure.
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*/
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int (*init)(int port_addr);
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/**
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* Set USB mux state.
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*
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* @param port_addr Port/address driver-defined parameter.
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* @param mux_state State to set mux to.
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* @return EC_SUCCESS on success, non-zero error code on failure.
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*/
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int (*set)(int port_addr, mux_state_t mux_state);
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/**
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* Get current state of USB mux.
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*
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* @param port_addr Port / address driver-defined parameter.
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* @param mux_state Gets set to current state of mux.
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* @return EC_SUCCESS on success, non-zero error code on failure.
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*/
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int (*get)(int port_addr, mux_state_t *mux_state);
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};
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/* Describes a USB mux present in the system */
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struct usb_mux {
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/*
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* Driver-defined parameter, typically an i2c slave address
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* (for i2c muxes) or a port number (for GPIO 'muxes').
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*/
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const int port_addr;
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/* Mux driver */
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const struct usb_mux_driver *driver;
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/**
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* Board specific initialization for USB mux that is
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* called after mux->driver->init() function.
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*
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* @param mux USB mux to tune
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* @return EC_SUCCESS on success, non-zero error code on failure.
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*/
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int (*board_init)(const struct usb_mux *mux);
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};
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/* Supported USB mux drivers */
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extern const struct usb_mux_driver pi3usb30532_usb_mux_driver;
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extern const struct usb_mux_driver ps8740_usb_mux_driver;
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extern const struct usb_mux_driver tcpm_usb_mux_driver;
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/* USB muxes present in system, ordered by PD port #, defined at board-level */
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extern struct usb_mux usb_muxes[];
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/**
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* Initialize USB mux to its default state.
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*
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* @param port Port number.
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*/
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void usb_mux_init(int port);
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/**
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* Configure superspeed muxes on type-C port.
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*
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* @param port port number.
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* @param mux_mode mux selected function.
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* @param usb_config usb2.0 selected function.
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* @param polarity plug polarity (0=CC1, 1=CC2).
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*/
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void usb_mux_set(int port, enum typec_mux mux_mode,
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enum usb_switch usb_config, int polarity);
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/**
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* Query superspeed mux status on type-C port.
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*
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* @param port port number.
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* @param dp_str pointer to the DP string to return.
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* @param usb_str pointer to the USB string to return.
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* @return Non-zero if superspeed connection is enabled; otherwise, zero.
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*/
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int usb_mux_get(int port, const char **dp_str, const char **usb_str);
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/**
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* Flip the superspeed muxes on type-C port.
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*
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* This is used for factory test automation. Note that this function should
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* only flip the superspeed muxes and leave CC lines alone. Without further
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* changes, this function MUST ONLY be used for testing purpose, because
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* the protocol layer loses track of the superspeed polarity and DP/USB3.0
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* connection may break.
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*
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* @param port port number.
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*/
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void usb_mux_flip(int port);
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#endif
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