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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.
*
* PI3DPX1207 retimer.
*/
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "i2c.h"
#include "ioexpander.h"
#include "pi3dpx1207.h"
#include "usb_mux.h"
#define I2C_MAX_RETRIES 2
/* Stack space is limited, so put the buffer somewhere else */
static uint8_t buf[PI3DPX1207_NUM_REGISTERS];
/**
* Local utility functions
*/
static int pi3dpx1207_i2c_write(const struct usb_mux *me, uint8_t offset,
uint8_t val)
{
int rv = EC_SUCCESS;
int attempt;
if (offset >= PI3DPX1207_NUM_REGISTERS)
return EC_ERROR_INVAL;
/*
* PI3DPX1207 does not support device register offset in
* the typical I2C sense. Have to read the values starting
* from 0, modify the byte and then write the block.
*
* NOTE: The device may not respond correctly if it was
* just powered or has gone to sleep. Allow for retries
* in case this happens.
*/
if (offset > 0) {
attempt = 0;
do {
attempt++;
rv = i2c_xfer(me->i2c_port, me->i2c_addr_flags, NULL, 0,
buf, offset);
} while ((rv != EC_SUCCESS) && (attempt < I2C_MAX_RETRIES));
}
if (rv == EC_SUCCESS) {
buf[offset] = val;
attempt = 0;
do {
attempt++;
rv = i2c_xfer(me->i2c_port, me->i2c_addr_flags, buf,
offset + 1, NULL, 0);
} while ((rv != EC_SUCCESS) && (attempt < I2C_MAX_RETRIES));
}
return rv;
}
static void pi3dpx1207_shutoff_power(const struct usb_mux *me)
{
const int port = me->usb_port;
const int gpio_enable = pi3dpx1207_controls[port].enable_gpio;
const int gpio_dp_enable = pi3dpx1207_controls[port].dp_enable_gpio;
gpio_or_ioex_set_level(gpio_enable, 0);
gpio_or_ioex_set_level(gpio_dp_enable, 0);
}
/**
* Driver interface code
*/
static int pi3dpx1207_init(const struct usb_mux *me)
{
const int port = me->usb_port;
const int gpio_enable = pi3dpx1207_controls[port].enable_gpio;
gpio_or_ioex_set_level(gpio_enable, 1);
return EC_SUCCESS;
}
static int pi3dpx1207_enter_low_power_mode(const struct usb_mux *me)
{
pi3dpx1207_shutoff_power(me);
return EC_SUCCESS;
}
static int pi3dpx1207_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
int rv = EC_SUCCESS;
uint8_t mode_val = PI3DPX1207_MODE_WATCHDOG_EN;
const int port = me->usb_port;
const int gpio_enable = pi3dpx1207_controls[port].enable_gpio;
const int gpio_dp_enable = pi3dpx1207_controls[port].dp_enable_gpio;
/* 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;
/* USB */
if (mux_state & USB_PD_MUX_USB_ENABLED) {
gpio_or_ioex_set_level(gpio_enable, 1);
/* USB with DP */
if (mux_state & USB_PD_MUX_DP_ENABLED) {
gpio_or_ioex_set_level(gpio_dp_enable, 1);
mode_val |= (mux_state & USB_PD_MUX_POLARITY_INVERTED) ?
PI3DPX1207_MODE_CONF_USB_DP_FLIP :
PI3DPX1207_MODE_CONF_USB_DP;
}
/* USB without DP */
else {
gpio_or_ioex_set_level(gpio_dp_enable, 0);
mode_val |= (mux_state & USB_PD_MUX_POLARITY_INVERTED) ?
PI3DPX1207_MODE_CONF_USB_FLIP :
PI3DPX1207_MODE_CONF_USB;
}
}
/* DP without USB */
else if (mux_state & USB_PD_MUX_DP_ENABLED) {
gpio_or_ioex_set_level(gpio_enable, 1);
gpio_or_ioex_set_level(gpio_dp_enable, 1);
mode_val |= (mux_state & USB_PD_MUX_POLARITY_INVERTED) ?
PI3DPX1207_MODE_CONF_DP_FLIP :
PI3DPX1207_MODE_CONF_DP;
}
/* Nothing enabled, power down the retimer */
else {
pi3dpx1207_shutoff_power(me);
return EC_SUCCESS;
}
/* Write the retimer config byte */
rv = pi3dpx1207_i2c_write(me, PI3DPX1207_MODE_OFFSET, mode_val);
return rv;
}
const struct usb_mux_driver pi3dpx1207_usb_retimer = {
.init = pi3dpx1207_init,
.set = pi3dpx1207_set_mux,
.enter_low_power_mode = pi3dpx1207_enter_low_power_mode,
};
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