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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.
*
* Parade PS8743 USB Type-C Redriving Switch for USB Host / DisplayPort.
*/
#include "common.h"
#include "i2c.h"
#include "ps8743.h"
#include "usb_mux.h"
#include "util.h"
int ps8743_read(const struct usb_mux *me, uint8_t reg, int *val)
{
return i2c_read8(me->i2c_port, me->i2c_addr_flags,
reg, val);
}
int ps8743_write(const struct usb_mux *me, uint8_t reg, uint8_t val)
{
return i2c_write8(me->i2c_port, me->i2c_addr_flags,
reg, val);
}
int ps8743_check_chip_id(const struct usb_mux *me, int *val)
{
int id1;
int id2;
int res;
/*
* Verify chip ID registers.
*/
res = ps8743_read(me, PS8743_REG_CHIP_ID1, &id1);
if (res)
return res;
res = ps8743_read(me, PS8743_REG_CHIP_ID2, &id2);
if (res)
return res;
*val = (id2 << 8) + id1;
return EC_SUCCESS;
}
static int ps8743_init(const struct usb_mux *me)
{
int id1;
int id2;
int res;
/* Reset chip back to power-on state */
res = ps8743_write(me, PS8743_REG_MODE, PS8743_MODE_POWER_DOWN);
if (res)
return res;
/*
* Verify chip ID registers.
*/
res = ps8743_read(me, PS8743_REG_CHIP_ID1, &id1);
if (res)
return res;
res = ps8743_read(me, PS8743_REG_CHIP_ID2, &id2);
if (res)
return res;
if (id1 != PS8743_CHIP_ID1 || id2 != PS8743_CHIP_ID2)
return EC_ERROR_UNKNOWN;
/*
* Verify revision ID registers.
*/
res = ps8743_read(me, PS8743_REG_REVISION_ID1, &id1);
if (res)
return res;
res = ps8743_read(me, PS8743_REG_REVISION_ID2, &id2);
if (res)
return res;
/*
* From Parade: PS8743 may have REVISION_ID1 as 0 or 1
* Rev 1 is derived from Rev 0 and have same functionality.
*/
if (id1 != PS8743_REVISION_ID1_0 && id1 != PS8743_REVISION_ID1_1)
return EC_ERROR_UNKNOWN;
if (id2 != PS8743_REVISION_ID2)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
/* Writes control register to set switch mode */
static int ps8743_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
/*
* For CE_DP, CE_USB, and FLIP, disable pin control and enable I2C
* control.
*/
uint8_t reg = (PS8743_MODE_IN_HPD_CONTROL |
PS8743_MODE_DP_REG_CONTROL |
PS8743_MODE_USB_REG_CONTROL |
PS8743_MODE_FLIP_REG_CONTROL);
/* This driver does not use host command ACKs */
*ack_required = false;
if (mux_state & USB_PD_MUX_USB_ENABLED)
reg |= PS8743_MODE_USB_ENABLE;
if (mux_state & USB_PD_MUX_DP_ENABLED)
reg |= PS8743_MODE_DP_ENABLE | PS8743_MODE_IN_HPD_ASSERT;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
reg |= PS8743_MODE_FLIP_ENABLE;
return ps8743_write(me, PS8743_REG_MODE, reg);
}
/* Reads control register and updates mux_state accordingly */
static int ps8743_get_mux(const struct usb_mux *me, mux_state_t *mux_state)
{
int reg;
int res;
res = ps8743_read(me, PS8743_REG_STATUS, ®);
if (res)
return res;
*mux_state = 0;
if (reg & PS8743_STATUS_USB_ENABLED)
*mux_state |= USB_PD_MUX_USB_ENABLED;
if (reg & PS8743_STATUS_DP_ENABLED)
*mux_state |= USB_PD_MUX_DP_ENABLED;
if (reg & PS8743_STATUS_POLARITY_INVERTED)
*mux_state |= USB_PD_MUX_POLARITY_INVERTED;
return EC_SUCCESS;
}
/* Tune USB Tx/Rx Equalization */
int ps8743_tune_usb_eq(const struct usb_mux *me, uint8_t tx, uint8_t rx)
{
int ret;
ret = ps8743_write(me, PS8743_REG_USB_EQ_TX, tx);
ret |= ps8743_write(me, PS8743_REG_USB_EQ_RX, rx);
return ret;
}
const struct usb_mux_driver ps8743_usb_mux_driver = {
.init = ps8743_init,
.set = ps8743_set_mux,
.get = ps8743_get_mux,
};
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