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/* Copyright 2019 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.
*
* PS8818 retimer.
*/
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "i2c.h"
#include "ioexpander.h"
#include "ps8818.h"
#include "usb_mux.h"
static int ps8818_i2c_read(int port, int offset, int *data)
{
return i2c_read8(usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags,
offset, data);
}
static int ps8818_i2c_write(int port, int offset, int data)
{
return i2c_write8(usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags,
offset, data);
}
int ps8818_detect(int port)
{
int rv = EC_ERROR_NOT_POWERED;
int val;
/* Detected if we are powered and can read the device */
if (!chipset_in_state(CHIPSET_STATE_HARD_OFF))
rv = ps8818_i2c_read(port, PS8818_REG_FLIP, &val);
return rv;
}
static int ps8818_set_mux(int port, mux_state_t mux_state)
{
int rv;
int val = 0;
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
return (mux_state == USB_PD_MUX_NONE) ? EC_SUCCESS
: EC_ERROR_NOT_POWERED;
if (mux_state & USB_PD_MUX_USB_ENABLED)
val |= PS8818_MODE_USB_ENABLE;
if (mux_state & USB_PD_MUX_DP_ENABLED)
val |= PS8818_MODE_DP_ENABLE;
rv = ps8818_i2c_write(port, PS8818_REG_MODE, val);
if (rv)
return rv;
val = 0;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
val |= PS8818_FLIP_CONFIG;
return ps8818_i2c_write(port, PS8818_REG_FLIP, val);
}
const struct usb_retimer_driver ps8818_usb_retimer = {
.set = ps8818_set_mux,
};
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