diff options
Diffstat (limited to 'driver/usb_mux/ps8740.c')
| -rw-r--r-- | driver/usb_mux/ps8740.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/driver/usb_mux/ps8740.c b/driver/usb_mux/ps8740.c deleted file mode 100644 index 618c74cd65..0000000000 --- a/driver/usb_mux/ps8740.c +++ /dev/null @@ -1,127 +0,0 @@ -/* Copyright 2020 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. - * - * Parade PS8740 (and PS8742) - * USB Type-C Redriving Switch for USB Host / DisplayPort. - */ - -#include "common.h" -#include "i2c.h" -#include "ps8740.h" -#include "usb_mux.h" -#include "util.h" - -int ps8740_read(const struct usb_mux *me, uint8_t reg, int *val) -{ - return i2c_read8(me->i2c_port, me->i2c_addr_flags, - reg, val); -} - -int ps8740_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 ps8740_init(const struct usb_mux *me) -{ - int id1; - int id2; - int res; - - /* Reset chip back to power-on state */ - res = ps8740_write(me, PS8740_REG_MODE, PS8740_MODE_POWER_DOWN); - if (res) - return res; - - /* - * Verify chip ID registers. - */ - res = ps8740_read(me, PS8740_REG_CHIP_ID1, &id1); - if (res) - return res; - - res = ps8740_read(me, PS8740_REG_CHIP_ID2, &id2); - if (res) - return res; - - if (id1 != PS8740_CHIP_ID1 || id2 != PS8740_CHIP_ID2) - return EC_ERROR_UNKNOWN; - - /* - * Verify revision ID registers. - */ - res = ps8740_read(me, PS8740_REG_REVISION_ID1, &id1); - if (res) - return res; - - res = ps8740_read(me, PS8740_REG_REVISION_ID2, &id2); - if (res) - return res; - - if (id1 != PS8740_REVISION_ID1) - return EC_ERROR_UNKNOWN; - /* PS8740 may have REVISION_ID2 as 0xa or 0xb */ - if (id2 != PS8740_REVISION_ID2_0 && id2 != PS8740_REVISION_ID2_1) - return EC_ERROR_UNKNOWN; - - return EC_SUCCESS; -} - -/* Writes control register to set switch mode */ -static int ps8740_set_mux(const struct usb_mux *me, mux_state_t mux_state, - bool *ack_required) -{ - uint8_t reg = 0; - - /* This driver does not use host command ACKs */ - *ack_required = false; - - if (mux_state & USB_PD_MUX_USB_ENABLED) - reg |= PS8740_MODE_USB_ENABLED; - if (mux_state & USB_PD_MUX_DP_ENABLED) - reg |= PS8740_MODE_DP_ENABLED; - if (mux_state & USB_PD_MUX_POLARITY_INVERTED) - reg |= PS8740_MODE_POLARITY_INVERTED; - - return ps8740_write(me, PS8740_REG_MODE, reg); -} - -/* Reads control register and updates mux_state accordingly */ -static int ps8740_get_mux(const struct usb_mux *me, mux_state_t *mux_state) -{ - int reg; - int res; - - res = ps8740_read(me, PS8740_REG_STATUS, ®); - if (res) - return res; - - *mux_state = 0; - if (reg & PS8740_STATUS_USB_ENABLED) - *mux_state |= USB_PD_MUX_USB_ENABLED; - if (reg & PS8740_STATUS_DP_ENABLED) - *mux_state |= USB_PD_MUX_DP_ENABLED; - if (reg & PS8740_STATUS_POLARITY_INVERTED) - *mux_state |= USB_PD_MUX_POLARITY_INVERTED; - - return EC_SUCCESS; -} - -/* Tune USB Tx/Rx Equalization */ -int ps8740_tune_usb_eq(const struct usb_mux *me, uint8_t tx, uint8_t rx) -{ - int ret; - - ret = ps8740_write(me, PS8740_REG_USB_EQ_TX, tx); - ret |= ps8740_write(me, PS8740_REG_USB_EQ_RX, rx); - - return ret; -} - -const struct usb_mux_driver ps8740_usb_mux_driver = { - .init = ps8740_init, - .set = ps8740_set_mux, - .get = ps8740_get_mux, -}; |