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/* Copyright 2015 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.
*
* Pericom PI3USB30532 USB port switch driver.
*/
#include "common.h"
#include "i2c.h"
#include "pi3usb30532.h"
#include "usb_mux.h"
#include "util.h"
static int pi3usb30532_read(int port, uint8_t reg, uint8_t *val)
{
int read, res;
/*
* First byte read will be slave address (ignored).
* Second byte read will be vendor ID.
* Third byte read will be selection control.
*/
res = i2c_read16(I2C_PORT_USB_MUX, MUX_ADDR(port), 0, &read);
if (res)
return res;
if (reg == PI3USB30532_REG_VENDOR)
*val = read & 0xff;
else /* reg == PI3USB30532_REG_CONTROL */
*val = (read >> 8) & 0xff;
return EC_SUCCESS;
}
static int pi3usb30532_write(int port, uint8_t reg, uint8_t val)
{
if (reg != PI3USB30532_REG_CONTROL)
return EC_ERROR_UNKNOWN;
return i2c_write8(I2C_PORT_USB_MUX, MUX_ADDR(port), 0, val);
}
static int pi3usb30532_reset(int port)
{
return pi3usb30532_write(
port,
PI3USB30532_REG_CONTROL,
(PI3USB30532_MODE_POWERDOWN & PI3USB30532_CTRL_MASK) |
PI3USB30532_CTRL_RSVD);
}
static int pi3usb30532_init(int port)
{
uint8_t val;
int res;
res = pi3usb30532_reset(port);
if (res)
return res;
res = pi3usb30532_read(port, PI3USB30532_REG_VENDOR, &val);
if (res)
return res;
if (val != PI3USB30532_VENDOR_ID)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
/* Writes control register to set switch mode */
static int pi3usb30532_set_mux(int port, mux_state_t mux_state)
{
uint8_t reg = 0;
if (mux_state & MUX_USB_ENABLED)
reg |= PI3USB30532_MODE_USB;
if (mux_state & MUX_DP_ENABLED)
reg |= PI3USB30532_MODE_DP;
if (mux_state & MUX_POLARITY_INVERTED)
reg |= PI3USB30532_BIT_SWAP;
return pi3usb30532_write(port, PI3USB30532_REG_CONTROL,
reg | PI3USB30532_CTRL_RSVD);
}
/* Reads control register and updates mux_state accordingly */
static int pi3usb30532_get_mux(int port, mux_state_t *mux_state)
{
uint8_t reg = 0;
uint8_t res;
*mux_state = 0;
res = pi3usb30532_read(port, PI3USB30532_REG_CONTROL, ®);
if (res)
return res;
if (reg & PI3USB30532_MODE_USB)
*mux_state |= MUX_USB_ENABLED;
if (reg & PI3USB30532_MODE_DP)
*mux_state |= MUX_DP_ENABLED;
if (reg & PI3USB30532_BIT_SWAP)
*mux_state |= MUX_POLARITY_INVERTED;
return EC_SUCCESS;
}
const struct usb_mux_driver pi3usb30532_usb_mux_driver = {
.init = pi3usb30532_init,
.set = pi3usb30532_set_mux,
.get = pi3usb30532_get_mux,
};
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