diff options
Diffstat (limited to 'driver/usb_mux/ps8743.c')
| -rw-r--r-- | driver/usb_mux/ps8743.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/driver/usb_mux/ps8743.c b/driver/usb_mux/ps8743.c deleted file mode 100644 index f618bb009f..0000000000 --- a/driver/usb_mux/ps8743.c +++ /dev/null @@ -1,158 +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 PS8743 USB Type-C Redriving Switch for USB Host / DisplayPort. - */ - -#include "common.h" -#include "i2c.h" -#include "ps8743.h" -#include "usb_mux.h" -#include "util.h" - -int ps8743_read(const struct usb_mux *me, uint8_t reg, int *val) -{ - return i2c_read8(me->i2c_port, me->i2c_addr_flags, - reg, val); -} - -int ps8743_write(const struct usb_mux *me, uint8_t reg, uint8_t val) -{ - return i2c_write8(me->i2c_port, me->i2c_addr_flags, - reg, val); -} - -int ps8743_check_chip_id(const struct usb_mux *me, int *val) -{ - int id1; - int id2; - int res; - - /* - * Verify chip ID registers. - */ - res = ps8743_read(me, PS8743_REG_CHIP_ID1, &id1); - if (res) - return res; - - res = ps8743_read(me, PS8743_REG_CHIP_ID2, &id2); - if (res) - return res; - - *val = (id2 << 8) + id1; - - return EC_SUCCESS; -} - -static int ps8743_init(const struct usb_mux *me) -{ - int id1; - int id2; - int res; - - /* Reset chip back to power-on state */ - res = ps8743_write(me, PS8743_REG_MODE, PS8743_MODE_POWER_DOWN); - if (res) - return res; - - /* - * Verify chip ID registers. - */ - res = ps8743_read(me, PS8743_REG_CHIP_ID1, &id1); - if (res) - return res; - - res = ps8743_read(me, PS8743_REG_CHIP_ID2, &id2); - if (res) - return res; - - if (id1 != PS8743_CHIP_ID1 || id2 != PS8743_CHIP_ID2) - return EC_ERROR_UNKNOWN; - - /* - * Verify revision ID registers. - */ - res = ps8743_read(me, PS8743_REG_REVISION_ID1, &id1); - if (res) - return res; - - res = ps8743_read(me, PS8743_REG_REVISION_ID2, &id2); - if (res) - return res; - - /* - * From Parade: PS8743 may have REVISION_ID1 as 0 or 1 - * Rev 1 is derived from Rev 0 and have same functionality. - */ - if (id1 != PS8743_REVISION_ID1_0 && id1 != PS8743_REVISION_ID1_1) - return EC_ERROR_UNKNOWN; - if (id2 != PS8743_REVISION_ID2) - return EC_ERROR_UNKNOWN; - - return EC_SUCCESS; -} - -/* Writes control register to set switch mode */ -static int ps8743_set_mux(const struct usb_mux *me, mux_state_t mux_state, - bool *ack_required) -{ - /* - * For CE_DP, CE_USB, and FLIP, disable pin control and enable I2C - * control. - */ - uint8_t reg = (PS8743_MODE_IN_HPD_CONTROL | - PS8743_MODE_DP_REG_CONTROL | - PS8743_MODE_USB_REG_CONTROL | - PS8743_MODE_FLIP_REG_CONTROL); - - /* This driver does not use host command ACKs */ - *ack_required = false; - - if (mux_state & USB_PD_MUX_USB_ENABLED) - reg |= PS8743_MODE_USB_ENABLE; - if (mux_state & USB_PD_MUX_DP_ENABLED) - reg |= PS8743_MODE_DP_ENABLE | PS8743_MODE_IN_HPD_ASSERT; - if (mux_state & USB_PD_MUX_POLARITY_INVERTED) - reg |= PS8743_MODE_FLIP_ENABLE; - - return ps8743_write(me, PS8743_REG_MODE, reg); -} - -/* Reads control register and updates mux_state accordingly */ -static int ps8743_get_mux(const struct usb_mux *me, mux_state_t *mux_state) -{ - int reg; - int res; - - res = ps8743_read(me, PS8743_REG_STATUS, ®); - if (res) - return res; - - *mux_state = 0; - if (reg & PS8743_STATUS_USB_ENABLED) - *mux_state |= USB_PD_MUX_USB_ENABLED; - if (reg & PS8743_STATUS_DP_ENABLED) - *mux_state |= USB_PD_MUX_DP_ENABLED; - if (reg & PS8743_STATUS_POLARITY_INVERTED) - *mux_state |= USB_PD_MUX_POLARITY_INVERTED; - - return EC_SUCCESS; -} - -/* Tune USB Tx/Rx Equalization */ -int ps8743_tune_usb_eq(const struct usb_mux *me, uint8_t tx, uint8_t rx) -{ - int ret; - - ret = ps8743_write(me, PS8743_REG_USB_EQ_TX, tx); - ret |= ps8743_write(me, PS8743_REG_USB_EQ_RX, rx); - - return ret; -} - -const struct usb_mux_driver ps8743_usb_mux_driver = { - .init = ps8743_init, - .set = ps8743_set_mux, - .get = ps8743_get_mux, -}; |