113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
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/* Copyright 2015 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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* Pericom PI3USB30532 USB port switch driver.
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*/
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#include "common.h"
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#include "i2c.h"
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#include "pi3usb30532.h"
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#include "usb_mux.h"
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#include "util.h"
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static int pi3usb30532_read(int port, uint8_t reg, uint8_t *val)
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{
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int read, res;
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/*
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* First byte read will be slave address (ignored).
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* Second byte read will be vendor ID.
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* Third byte read will be selection control.
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*/
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res = i2c_read16(I2C_PORT_USB_MUX, MUX_ADDR(port),
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0, &read);
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if (res)
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return res;
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if (reg == PI3USB30532_REG_VENDOR)
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*val = read & 0xff;
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else /* reg == PI3USB30532_REG_CONTROL */
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*val = (read >> 8) & 0xff;
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return EC_SUCCESS;
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}
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static int pi3usb30532_write(int port, uint8_t reg, uint8_t val)
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{
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if (reg != PI3USB30532_REG_CONTROL)
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return EC_ERROR_UNKNOWN;
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return i2c_write8(I2C_PORT_USB_MUX, MUX_ADDR(port),
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0, val);
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}
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static int pi3usb30532_reset(int port)
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{
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return pi3usb30532_write(
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port,
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PI3USB30532_REG_CONTROL,
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(PI3USB30532_MODE_POWERDOWN & PI3USB30532_CTRL_MASK) |
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PI3USB30532_CTRL_RSVD);
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}
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static int pi3usb30532_init(int port)
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{
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uint8_t val;
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int res;
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res = pi3usb30532_reset(port);
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if (res)
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return res;
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res = pi3usb30532_read(port, PI3USB30532_REG_VENDOR, &val);
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if (res)
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return res;
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if (val != PI3USB30532_VENDOR_ID)
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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 pi3usb30532_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 |= PI3USB30532_MODE_USB;
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if (mux_state & MUX_DP_ENABLED)
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reg |= PI3USB30532_MODE_DP;
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if (mux_state & MUX_POLARITY_INVERTED)
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reg |= PI3USB30532_BIT_SWAP;
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return pi3usb30532_write(port, PI3USB30532_REG_CONTROL,
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reg | PI3USB30532_CTRL_RSVD);
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}
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/* Reads control register and updates mux_state accordingly */
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static int pi3usb30532_get_mux(int port, mux_state_t *mux_state)
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{
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uint8_t reg = 0;
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uint8_t res;
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*mux_state = 0;
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res = pi3usb30532_read(port, PI3USB30532_REG_CONTROL, ®);
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if (res)
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return res;
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if (reg & PI3USB30532_MODE_USB)
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*mux_state |= MUX_USB_ENABLED;
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if (reg & PI3USB30532_MODE_DP)
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*mux_state |= MUX_DP_ENABLED;
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if (reg & PI3USB30532_BIT_SWAP)
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*mux_state |= MUX_POLARITY_INVERTED;
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return EC_SUCCESS;
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}
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const struct usb_mux_driver pi3usb30532_usb_mux_driver = {
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.init = pi3usb30532_init,
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.set = pi3usb30532_set_mux,
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.get = pi3usb30532_get_mux,
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};
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