136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
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/* 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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* ITE IT5205 Type-C USB alternate mode mux.
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*/
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#include "common.h"
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#include "console.h"
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#include "i2c.h"
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#include "it5205.h"
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#include "usb_mux.h"
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#include "util.h"
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#define MUX_STATE_DP_USB_MASK (MUX_USB_ENABLED | MUX_DP_ENABLED)
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static int it5205_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), reg, val);
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}
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static int it5205_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), reg, val);
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}
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struct mux_chip_id_t {
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uint8_t chip_id;
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uint8_t reg;
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};
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static const struct mux_chip_id_t mux_chip_id_verify[] = {
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{ '5', IT5205_REG_CHIP_ID3},
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{ '2', IT5205_REG_CHIP_ID2},
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{ '0', IT5205_REG_CHIP_ID1},
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{ '5', IT5205_REG_CHIP_ID0},
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};
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static int it5205_init(int port)
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{
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int i, val, ret;
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/* bit[0]: mux power on, bit[7-1]: reserved. */
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ret = it5205_write(port, IT5205_REG_MUXPDR, 0);
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if (ret)
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return ret;
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/* Verify chip ID registers. */
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for (i = 0; i < ARRAY_SIZE(mux_chip_id_verify); i++) {
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ret = it5205_read(port, mux_chip_id_verify[i].reg, &val);
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if (ret)
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return ret;
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if (val != mux_chip_id_verify[i].chip_id)
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return EC_ERROR_UNKNOWN;
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}
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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 it5205_set_mux(int port, mux_state_t mux_state)
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{
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uint8_t reg;
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switch (mux_state & MUX_STATE_DP_USB_MASK) {
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case MUX_USB_ENABLED:
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reg = IT5205_USB;
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break;
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case MUX_DP_ENABLED:
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reg = IT5205_DP;
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break;
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case MUX_STATE_DP_USB_MASK:
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reg = IT5205_DP_USB;
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break;
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default:
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reg = 0;
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break;
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}
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if (mux_state & MUX_POLARITY_INVERTED)
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reg |= IT5205_POLARITY_INVERTED;
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return it5205_write(port, IT5205_REG_MUXCR, reg);
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}
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/* Reads control register and updates mux_state accordingly */
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static int it5205_get_mux(int port, mux_state_t *mux_state)
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{
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int reg, ret;
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ret = it5205_read(port, IT5205_REG_MUXCR, ®);
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if (ret)
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return ret;
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switch (reg & IT5205_DP_USB_CTRL_MASK) {
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case IT5205_USB:
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*mux_state = MUX_USB_ENABLED;
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break;
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case IT5205_DP:
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*mux_state = MUX_DP_ENABLED;
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break;
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case IT5205_DP_USB:
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*mux_state = MUX_STATE_DP_USB_MASK;
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break;
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default:
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*mux_state = 0;
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break;
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}
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if (reg & IT5205_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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static int it5205_enter_low_power_mode(int port)
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{
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int rv;
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/* Turn off all switches */
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rv = it5205_write(port, IT5205_REG_MUXCR, 0);
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if (rv)
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return rv;
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/* Power down mux */
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return it5205_write(port, IT5205_REG_MUXPDR, IT5205_MUX_POWER_DOWN);
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}
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const struct usb_mux_driver it5205_usb_mux_driver = {
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.init = &it5205_init,
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.set = &it5205_set_mux,
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.get = &it5205_get_mux,
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.enter_low_power_mode = &it5205_enter_low_power_mode,
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};
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