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/* Copyright 2019 The ChromiumOS Authors
* 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 "driver/retimer/ps8818_public.h"
#include "gpio.h"
#include "i2c.h"
#include "ioexpander.h"
#include "usb_mux.h"
#define PS8818_DEBUG 0
int ps8818_i2c_read(const struct usb_mux *me, int page, int offset, int *data)
{
int rv;
rv = i2c_read8(me->i2c_port, me->i2c_addr_flags + page, offset, data);
if (PS8818_DEBUG)
ccprintf("%s(%d:0x%02X, 0x%02X) =>0x%02X\n", __func__,
me->usb_port, me->i2c_addr_flags + page, offset,
*data);
return rv;
}
int ps8818_i2c_write(const struct usb_mux *me, int page, int offset, int data)
{
int rv;
int pre_val, post_val;
if (PS8818_DEBUG)
i2c_read8(me->i2c_port, me->i2c_addr_flags + page, offset,
&pre_val);
rv = i2c_write8(me->i2c_port, me->i2c_addr_flags + page, offset, data);
if (PS8818_DEBUG) {
i2c_read8(me->i2c_port, me->i2c_addr_flags + page, offset,
&post_val);
ccprintf("%s(%d:0x%02X, 0x%02X, 0x%02X) "
"0x%02X=>0x%02X\n",
__func__, me->usb_port, me->i2c_addr_flags + page,
offset, data, pre_val, post_val);
}
return rv;
}
int ps8818_i2c_field_update8(const struct usb_mux *me, int page, int offset,
uint8_t field_mask, uint8_t set_value)
{
int rv;
int pre_val, post_val;
if (PS8818_DEBUG)
i2c_read8(me->i2c_port, me->i2c_addr_flags + page, offset,
&pre_val);
rv = i2c_field_update8(me->i2c_port, me->i2c_addr_flags + page, offset,
field_mask, set_value);
if (PS8818_DEBUG) {
i2c_read8(me->i2c_port, me->i2c_addr_flags + page, offset,
&post_val);
ccprintf("%s(%d:0x%02X, 0x%02X, 0x%02X, 0x%02X) "
"0x%02X=>0x%02X\n",
__func__, me->usb_port, me->i2c_addr_flags + page,
offset, field_mask, set_value, pre_val, post_val);
}
return rv;
}
static int ps8818_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
int rv;
int val = 0;
/* This driver does not use host command ACKs */
*ack_required = false;
/* This driver treats safe mode as none */
if (mux_state == USB_PD_MUX_SAFE_MODE)
mux_state = USB_PD_MUX_NONE;
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
return (mux_state == USB_PD_MUX_NONE) ? EC_SUCCESS :
EC_ERROR_NOT_POWERED;
if (PS8818_DEBUG)
ccprintf("%s(%d, 0x%02X) %s %s %s\n", __func__, me->usb_port,
mux_state,
(mux_state & USB_PD_MUX_USB_ENABLED) ? "USB" : "",
(mux_state & USB_PD_MUX_DP_ENABLED) ? "DP" : "",
(mux_state & USB_PD_MUX_POLARITY_INVERTED) ? "FLIP" :
"");
/* Set the mode */
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_field_update8(me, PS8818_REG_PAGE0, PS8818_REG0_MODE,
PS8818_MODE_NON_RESERVED_MASK, val);
if (rv)
return rv;
/* Set the flip */
val = 0;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
val |= PS8818_FLIP_CONFIG;
rv = ps8818_i2c_field_update8(me, PS8818_REG_PAGE0, PS8818_REG0_FLIP,
PS8818_FLIP_NON_RESERVED_MASK, val);
if (rv)
return rv;
/* Set the IN_HPD */
val = PS8818_DPHPD_CONFIG_INHPD_DISABLE;
if (mux_state & USB_PD_MUX_DP_ENABLED)
val |= PS8818_DPHPD_PLUGGED;
rv = ps8818_i2c_field_update8(me, PS8818_REG_PAGE0,
PS8818_REG0_DPHPD_CONFIG,
PS8818_DPHPD_NON_RESERVED_MASK, val);
return rv;
}
const struct usb_mux_driver ps8818_usb_retimer_driver = {
.set = ps8818_set_mux,
};
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