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/* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Virtual USB mux driver for host-controlled USB muxes.
*/
#include "common.h"
#include "console.h"
#include "host_command.h"
#include "task.h"
#include "timer.h"
#include "usb_mux.h"
#include "util.h"
/*
* USB PD protocol configures the USB & DP mux state and USB PD policy
* configures the HPD mux state. Both states are independent of each other
* may differ when the PD role changes when in dock mode.
*/
#define USB_PD_MUX_HPD_STATE (USB_PD_MUX_HPD_LVL | USB_PD_MUX_HPD_IRQ)
#define USB_PD_MUX_USB_DP_STATE \
(USB_PD_MUX_USB_ENABLED | USB_PD_MUX_DP_ENABLED | \
USB_PD_MUX_POLARITY_INVERTED | USB_PD_MUX_SAFE_MODE | \
USB_PD_MUX_TBT_COMPAT_ENABLED | USB_PD_MUX_USB4_ENABLED)
static mux_state_t virtual_mux_state[CONFIG_USB_PD_PORT_MAX_COUNT];
static inline void virtual_mux_update_state(int port, mux_state_t mux_state,
bool *ack_required)
{
mux_state_t previous_mux_state = virtual_mux_state[port];
virtual_mux_state[port] = mux_state;
/*
* Initialize ack_required to false to start, and set on necessary
* conditions
*/
*ack_required = false;
if (!IS_ENABLED(CONFIG_HOSTCMD_EVENTS))
return;
host_set_single_event(EC_HOST_EVENT_USB_MUX);
if (!IS_ENABLED(CONFIG_USB_MUX_AP_ACK_REQUEST))
return;
/*
* EC waits for the ACK from kernel indicating that TCSS Mux
* configuration is completed. This mechanism is implemented for
* entering, exiting the safe mode and entering the disconnect mode
* This is needed to remove timing senstivity between BB retimer and
* TCSS Mux to allow better synchronization between them and thereby
* remain in the same state for achieving proper safe state
* terminations.
*
* Note the AP will only ACK if the mux state changed in some way.
*/
if (previous_mux_state != mux_state)
*ack_required = true;
}
static int virtual_init(const struct usb_mux *me)
{
return EC_SUCCESS;
}
/*
* Set the state of our 'virtual' mux. The EC does not actually control this
* mux, so update the desired state, then notify the host of the update.
*/
static int virtual_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
int port = me->usb_port;
mux_state_t new_mux_state;
/*
* Current USB & DP mux status + existing HPD related mux status if DP
* is still active. Otherwise, don't preserve HPD state.
*/
if (mux_state & USB_PD_MUX_DP_ENABLED)
new_mux_state =
(mux_state & ~USB_PD_MUX_HPD_STATE) |
(virtual_mux_state[port] & USB_PD_MUX_HPD_STATE);
else
new_mux_state = mux_state;
virtual_mux_update_state(port, new_mux_state, ack_required);
return EC_SUCCESS;
}
/*
* Get the state of our 'virtual' mux. Since we the EC does not actually
* control this mux, and the EC has no way of knowing its actual status,
* we return the desired state here.
*/
static int virtual_get_mux(const struct usb_mux *me, mux_state_t *mux_state)
{
int port = me->usb_port;
*mux_state = virtual_mux_state[port];
return EC_SUCCESS;
}
void virtual_hpd_update(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
int port = me->usb_port;
/* Current HPD related mux status + existing USB & DP mux status */
mux_state_t new_mux_state =
mux_state | (virtual_mux_state[port] & USB_PD_MUX_USB_DP_STATE);
virtual_mux_update_state(port, new_mux_state, ack_required);
}
const struct usb_mux_driver virtual_usb_mux_driver = {
.init = virtual_init,
.set = virtual_set_mux,
.get = virtual_get_mux,
};
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