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/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* TI TUSB544 USB Type-C Multi-Protocol Linear Redriver
*/
#include "i2c.h"
#include "tusb544.h"
#include "usb_mux.h"
static int tusb544_write(const struct usb_mux *me, int offset, int data)
{
return i2c_write8(me->i2c_port, me->i2c_addr_flags, offset, data);
}
static int tusb544_read(const struct usb_mux *me, int offset, int *data)
{
return i2c_read8(me->i2c_port, me->i2c_addr_flags, offset, data);
}
int tusb544_i2c_field_update8(const struct usb_mux *me, int offset,
uint8_t field_mask, uint8_t set_value)
{
int rv;
rv = i2c_field_update8(me->i2c_port, me->i2c_addr_flags, offset,
field_mask, set_value);
return rv;
}
static int tusb544_enter_low_power_mode(const struct usb_mux *me)
{
int reg;
int rv;
rv = tusb544_read(me, TUSB544_REG_GENERAL4, ®);
if (rv)
return rv;
/* Setting CTL_SEL[0,1] to 0 powers down, per Table 5 */
reg &= ~TUSB544_GEN4_CTL_SEL;
/* Clear HPD */
reg &= ~TUSB544_GEN4_HPDIN;
return tusb544_write(me, TUSB544_REG_GENERAL4, reg);
}
static int tusb544_init(const struct usb_mux *me)
{
return EC_SUCCESS;
}
static int tusb544_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
int reg;
int rv;
/* 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 (mux_state == USB_PD_MUX_NONE)
return tusb544_enter_low_power_mode(me);
rv = tusb544_read(me, TUSB544_REG_GENERAL4, ®);
if (rv)
return rv;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
reg |= TUSB544_GEN4_FLIP_SEL;
else
reg &= ~TUSB544_GEN4_FLIP_SEL;
reg &= ~TUSB544_GEN4_CTL_SEL;
if (IS_ENABLED(CONFIG_TUSB544_EQ_BY_REGISTER))
reg |= TUSB544_GEN4_EQ_OVRD;
if ((mux_state & USB_PD_MUX_USB_ENABLED) &&
(mux_state & USB_PD_MUX_DP_ENABLED)) {
reg |= TUSB544_CTL_SEL_DP_USB;
reg |= TUSB544_GEN4_HPDIN;
} else if (mux_state & USB_PD_MUX_DP_ENABLED) {
reg |= TUSB544_CTL_SEL_DP_ONLY;
reg |= TUSB544_GEN4_HPDIN;
} else if (mux_state & USB_PD_MUX_USB_ENABLED)
reg |= TUSB544_CTL_SEL_USB_ONLY;
rv = tusb544_write(me, TUSB544_REG_GENERAL4, reg);
if (rv)
return rv;
rv = tusb544_read(me, TUSB544_REG_GENERAL6, ®);
if (rv)
return rv;
reg &= ~TUSB544_GEN6_DIR_SEL;
/* All chromebooks are DP SRC */
reg |= TUSB544_DIR_SEL_USB_DP_SRC;
return tusb544_write(me, TUSB544_REG_GENERAL6, reg);
}
const struct usb_mux_driver tusb544_drv = {
.enter_low_power_mode = &tusb544_enter_low_power_mode,
.init = &tusb544_init,
.set = &tusb544_set_mux,
};
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