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/* Copyright 2021 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.
*
* ANX7451: 10G Active Mux (4x4) with
* Integrated Re-timers for USB3.2/DisplayPort
*/
#include "anx7451.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "i2c.h"
#include "time.h"
#include "usb_mux.h"
#include "util.h"
#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args)
static inline int anx7451_read(const struct usb_mux *me,
uint8_t reg, int *val)
{
return i2c_read8(me->i2c_port, me->i2c_addr_flags, reg, val);
}
static inline int anx7451_write(const struct usb_mux *me,
uint8_t reg, uint8_t val)
{
return i2c_write8(me->i2c_port, me->i2c_addr_flags, reg, val);
}
static int anx7451_set_mux(const struct usb_mux *me, mux_state_t mux_state)
{
int reg;
/* Mux is not powered in Z1 */
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
return (mux_state == USB_PD_MUX_NONE) ? EC_SUCCESS
: EC_ERROR_NOT_POWERED;
/* ULTRA_LOW_POWER must always be disabled (Fig 2-2) */
RETURN_ERROR(anx7451_write(me, ANX7451_REG_ULTRA_LOW_POWER,
ANX7451_ULTRA_LOW_POWER_DIS));
/* b/184907521: If both DP and USB disabled, mux will fail */
if (!(mux_state & (USB_PD_MUX_USB_ENABLED | USB_PD_MUX_DP_ENABLED))) {
CPRINTS("ANX7451 requires USB or DP to be set, "
"forcing USB enabled");
mux_state |= USB_PD_MUX_USB_ENABLED;
}
/* ULP_CFG_MODE_EN overrides pin control. Always set it */
reg = ANX7451_ULP_CFG_MODE_EN;
if (mux_state & USB_PD_MUX_USB_ENABLED)
reg |= ANX7451_ULP_CFG_MODE_USB_EN;
if (mux_state & USB_PD_MUX_DP_ENABLED)
reg |= ANX7451_ULP_CFG_MODE_DP_EN;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
reg |= ANX7451_ULP_CFG_MODE_FLIP;
return anx7451_write(me, ANX7451_REG_ULP_CFG_MODE, reg);
}
static int anx7451_get_mux(const struct usb_mux *me, mux_state_t *mux_state)
{
int reg;
/* Mux is not powered in Z1 */
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
return USB_PD_MUX_NONE;
*mux_state = 0;
RETURN_ERROR(anx7451_read(me, ANX7451_REG_ULP_CFG_MODE, ®));
if (reg & ANX7451_ULP_CFG_MODE_USB_EN)
*mux_state |= USB_PD_MUX_USB_ENABLED;
if (reg & ANX7451_ULP_CFG_MODE_DP_EN)
*mux_state |= USB_PD_MUX_DP_ENABLED;
if (reg & ANX7451_ULP_CFG_MODE_FLIP)
*mux_state |= USB_PD_MUX_POLARITY_INVERTED;
return EC_SUCCESS;
}
const struct usb_mux_driver anx7451_usb_mux_driver = {
.set = anx7451_set_mux,
.get = anx7451_get_mux,
/* Low power mode is not supported on ANX7451 */
};
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