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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.
*
* Analogix ANX7440 USB Type-C Active mux with
* Integrated Re-timers for USB3.1/DisplayPort.
*/
#include "anx7440.h"
#include "common.h"
#include "console.h"
#include "i2c.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 anx7440_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 anx7440_write(const struct usb_mux *me, uint8_t reg,
uint8_t val)
{
return i2c_write8(me->i2c_port, me->i2c_addr_flags, reg, val);
}
struct anx7440_id_t {
uint8_t val;
uint8_t reg;
};
static const struct anx7440_id_t anx7440_device_ids[] = {
{ ANX7440_VENDOR_ID_L, ANX7440_REG_VENDOR_ID_L },
{ ANX7440_VENDOR_ID_H, ANX7440_REG_VENDOR_ID_H },
{ ANX7440_DEVICE_ID_L, ANX7440_REG_DEVICE_ID_L },
{ ANX7440_DEVICE_ID_H, ANX7440_REG_DEVICE_ID_H },
{ ANX7440_DEVICE_VERSION, ANX7440_REG_DEVICE_VERSION },
};
static int anx7440_init(const struct usb_mux *me)
{
int i;
int val;
int res;
/* Verify device id / version registers */
for (i = 0; i < ARRAY_SIZE(anx7440_device_ids); i++) {
res = anx7440_read(me, anx7440_device_ids[i].reg, &val);
if (res)
return res;
if (val != anx7440_device_ids[i].val)
return EC_ERROR_UNKNOWN;
}
return EC_SUCCESS;
}
/* Writes control register to set switch mode */
static int anx7440_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
int reg, res;
/* This driver does not use host command ACKs */
*ack_required = false;
res = anx7440_read(me, ANX7440_REG_CHIP_CTRL, ®);
if (res)
return res;
reg &= ~ANX7440_CHIP_CTRL_SW_OP_MODE_CLEAR;
if (mux_state & USB_PD_MUX_USB_ENABLED)
reg |= ANX7440_CHIP_CTRL_SW_OP_MODE_USB;
if (mux_state & USB_PD_MUX_DP_ENABLED)
reg |= ANX7440_CHIP_CTRL_SW_OP_MODE_DP;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
reg |= ANX7440_CHIP_CTRL_SW_FLIP;
return anx7440_write(me, ANX7440_REG_CHIP_CTRL, reg);
}
/* Reads control register and updates mux_state accordingly */
static int anx7440_get_mux(const struct usb_mux *me, mux_state_t *mux_state)
{
int reg, res;
*mux_state = 0;
res = anx7440_read(me, ANX7440_REG_CHIP_CTRL, ®);
if (res)
return res;
if (reg & ANX7440_CHIP_CTRL_OP_MODE_FINAL_USB)
*mux_state |= USB_PD_MUX_USB_ENABLED;
if (reg & ANX7440_CHIP_CTRL_OP_MODE_FINAL_DP)
*mux_state |= USB_PD_MUX_DP_ENABLED;
if (reg & ANX7440_CHIP_CTRL_FINAL_FLIP)
*mux_state |= USB_PD_MUX_POLARITY_INVERTED;
return EC_SUCCESS;
}
const struct usb_mux_driver anx7440_usb_mux_driver = {
.init = anx7440_init,
.set = anx7440_set_mux,
.get = anx7440_get_mux,
/* TODO(b/146683781): add low power mode */
};
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