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/* Copyright 2017 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* ITE IT5205 Type-C USB alternate mode mux.
*/
#include "common.h"
#include "i2c.h"
#include "it5205.h"
#include "util.h"
#define MUX_STATE_DP_USB_MASK (USB_PD_MUX_USB_ENABLED | USB_PD_MUX_DP_ENABLED)
static int it5205_read(const struct usb_mux *me, uint8_t reg, int *val)
{
return i2c_read8(me->i2c_port, me->i2c_addr_flags, reg, val);
}
static int it5205_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 it5205h_sbu_update(const struct usb_mux *me, uint8_t reg,
uint8_t mask, enum mask_update_action action)
{
return i2c_update8(me->i2c_port, IT5205H_SBU_I2C_ADDR_FLAGS, reg, mask,
action);
}
static int it5205h_sbu_field_update(const struct usb_mux *me, uint8_t reg,
uint8_t field_mask, uint8_t set_value)
{
return i2c_field_update8(me->i2c_port, IT5205H_SBU_I2C_ADDR_FLAGS, reg,
field_mask, set_value);
}
struct mux_chip_id_t {
uint8_t chip_id;
uint8_t reg;
};
static const struct mux_chip_id_t mux_chip_id_verify[] = {
{ '5', IT5205_REG_CHIP_ID3 },
{ '2', IT5205_REG_CHIP_ID2 },
{ '0', IT5205_REG_CHIP_ID1 },
{ '5', IT5205_REG_CHIP_ID0 },
};
static int it5205_init(const struct usb_mux *me)
{
int i, val, ret;
/* bit[0]: mux power on, bit[7-1]: reserved. */
ret = it5205_write(me, IT5205_REG_MUXPDR, 0);
if (ret)
return ret;
/* Verify chip ID registers. */
for (i = 0; i < ARRAY_SIZE(mux_chip_id_verify); i++) {
ret = it5205_read(me, mux_chip_id_verify[i].reg, &val);
if (ret)
return ret;
if (val != mux_chip_id_verify[i].chip_id)
return EC_ERROR_UNKNOWN;
}
if (IS_ENABLED(CONFIG_USB_MUX_IT5205H_SBU_OVP)) {
RETURN_ERROR(it5205h_sbu_field_update(
me, IT5205H_REG_VSR, IT5205H_VREF_SELECT_MASK,
IT5205H_VREF_SELECT_3_3V));
RETURN_ERROR(it5205h_sbu_field_update(me, IT5205H_REG_CSBUOVPSR,
IT5205H_OVP_SELECT_MASK,
IT5205H_OVP_3_68V));
RETURN_ERROR(it5205h_sbu_update(
me, IT5205H_REG_ISR, IT5205H_ISR_CSBU_MASK, MASK_CLR));
RETURN_ERROR(it5205h_enable_csbu_switch(me, true));
}
return EC_SUCCESS;
}
enum ec_error_list it5205h_enable_csbu_switch(const struct usb_mux *me, bool en)
{
return it5205h_sbu_update(me, IT5205H_REG_CSBUSR, IT5205H_CSBUSR_SWITCH,
en ? MASK_SET : MASK_CLR);
}
/* Writes control register to set switch mode */
static int it5205_set_mux(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
uint8_t reg;
/* 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;
switch (mux_state & MUX_STATE_DP_USB_MASK) {
case USB_PD_MUX_USB_ENABLED:
reg = IT5205_USB;
break;
case USB_PD_MUX_DP_ENABLED:
reg = IT5205_DP;
break;
case MUX_STATE_DP_USB_MASK:
reg = IT5205_DP_USB;
break;
default:
reg = 0;
break;
}
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
reg |= IT5205_POLARITY_INVERTED;
return it5205_write(me, IT5205_REG_MUXCR, reg);
}
/* Reads control register and updates mux_state accordingly */
static int it5205_get_mux(const struct usb_mux *me, mux_state_t *mux_state)
{
int reg, ret;
ret = it5205_read(me, IT5205_REG_MUXCR, ®);
if (ret)
return ret;
switch (reg & IT5205_DP_USB_CTRL_MASK) {
case IT5205_USB:
*mux_state = USB_PD_MUX_USB_ENABLED;
break;
case IT5205_DP:
*mux_state = USB_PD_MUX_DP_ENABLED;
break;
case IT5205_DP_USB:
*mux_state = MUX_STATE_DP_USB_MASK;
break;
default:
*mux_state = 0;
break;
}
if (reg & IT5205_POLARITY_INVERTED)
*mux_state |= USB_PD_MUX_POLARITY_INVERTED;
return EC_SUCCESS;
}
static int it5205_enter_low_power_mode(const struct usb_mux *me)
{
int rv;
/* Turn off all switches */
rv = it5205_write(me, IT5205_REG_MUXCR, 0);
if (rv)
return rv;
/* Power down mux */
return it5205_write(me, IT5205_REG_MUXPDR, IT5205_MUX_POWER_DOWN);
}
const struct usb_mux_driver it5205_usb_mux_driver = {
.init = &it5205_init,
.set = &it5205_set_mux,
.get = &it5205_get_mux,
.enter_low_power_mode = &it5205_enter_low_power_mode,
};
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