128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/* Copyright 2017 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Parade PS874X USB Type-C Redriving Switch for USB Host / DisplayPort.
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*/
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#include "common.h"
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#include "i2c.h"
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#include "ps874x.h"
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#include "usb_mux.h"
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#include "util.h"
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static inline int ps874x_read(int port, uint8_t reg, int *val)
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{
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return i2c_read8(I2C_PORT_USB_MUX, MUX_ADDR(port),
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reg, val);
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}
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static inline int ps874x_write(int port, uint8_t reg, uint8_t val)
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{
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return i2c_write8(I2C_PORT_USB_MUX, MUX_ADDR(port),
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reg, val);
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}
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static int ps874x_init(int port)
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{
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int val;
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int res;
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/* Reset chip back to power-on state */
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res = ps874x_write(port, PS874X_REG_MODE, PS874X_MODE_POWER_DOWN);
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if (res)
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return res;
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/*
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* Verify revision / chip ID registers.
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*/
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res = ps874x_read(port, PS874X_REG_REVISION_ID1, &val);
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if (res)
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return res;
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#ifdef CONFIG_USB_MUX_PS8743
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/*
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* From Parade: PS8743 may have REVISION_ID1 as 0 or 1
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* Rev 1 is derived from Rev 0 and have same functionality.
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*/
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if (val != PS874X_REVISION_ID1_0 && val != PS874X_REVISION_ID1_1)
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return EC_ERROR_UNKNOWN;
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#else
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if (val != PS874X_REVISION_ID1)
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return EC_ERROR_UNKNOWN;
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#endif
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res = ps874x_read(port, PS874X_REG_REVISION_ID2, &val);
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if (res)
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return res;
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if (val != PS874X_REVISION_ID2)
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return EC_ERROR_UNKNOWN;
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res = ps874x_read(port, PS874X_REG_CHIP_ID1, &val);
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if (res)
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return res;
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if (val != PS874X_CHIP_ID1)
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return EC_ERROR_UNKNOWN;
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res = ps874x_read(port, PS874X_REG_CHIP_ID2, &val);
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if (res)
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return res;
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if (val != PS874X_CHIP_ID2)
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return EC_ERROR_UNKNOWN;
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return EC_SUCCESS;
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}
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/* Writes control register to set switch mode */
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static int ps874x_set_mux(int port, mux_state_t mux_state)
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{
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uint8_t reg = 0;
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if (mux_state & MUX_USB_ENABLED)
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reg |= PS874X_MODE_USB_ENABLED;
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if (mux_state & MUX_DP_ENABLED)
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reg |= PS874X_MODE_DP_ENABLED;
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if (mux_state & MUX_POLARITY_INVERTED)
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reg |= PS874X_MODE_POLARITY_INVERTED;
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return ps874x_write(port, PS874X_REG_MODE, reg);
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}
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/* Reads control register and updates mux_state accordingly */
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static int ps874x_get_mux(int port, mux_state_t *mux_state)
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{
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int reg;
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int res;
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res = ps874x_read(port, PS874X_REG_STATUS, ®);
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if (res)
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return res;
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*mux_state = 0;
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if (reg & PS874X_STATUS_USB_ENABLED)
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*mux_state |= MUX_USB_ENABLED;
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if (reg & PS874X_STATUS_DP_ENABLED)
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*mux_state |= MUX_DP_ENABLED;
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if (reg & PS874X_STATUS_POLARITY_INVERTED)
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*mux_state |= MUX_POLARITY_INVERTED;
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return EC_SUCCESS;
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}
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/* Tune USB Tx/Rx Equalization */
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int ps874x_tune_usb_eq(int port, uint8_t tx, uint8_t rx)
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{
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int ret;
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ret = ps874x_write(port, PS874X_REG_USB_EQ_TX, tx);
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ret |= ps874x_write(port, PS874X_REG_USB_EQ_RX, rx);
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return ret;
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}
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const struct usb_mux_driver ps874x_usb_mux_driver = {
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.init = ps874x_init,
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.set = ps874x_set_mux,
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.get = ps874x_get_mux,
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};
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