diff options
Diffstat (limited to 'driver/usb_mux/anx7440.c')
| -rw-r--r-- | driver/usb_mux/anx7440.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/driver/usb_mux/anx7440.c b/driver/usb_mux/anx7440.c new file mode 100644 index 0000000000..ec02b8f90b --- /dev/null +++ b/driver/usb_mux/anx7440.c @@ -0,0 +1,106 @@ +/* Copyright 2019 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. + * + * Analogix ANX7440 USB Type-C Active mux with + * Integrated Re-timers for USB3.1/DisplayPort. + */ + +#include "anx7440.h" +#include "common.h" +#include "console.h" +#include "i2c.h" +#include "usb_mux.h" +#include "util.h" + +#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args) +#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args) + +static inline int anx7440_read(int port, uint8_t reg, int *val) +{ + return i2c_read8(I2C_PORT_USB_MUX, MUX_ADDR(port), reg, val); +} + +static inline int anx7440_write(int port, uint8_t reg, uint8_t val) +{ + return i2c_write8(I2C_PORT_USB_MUX, MUX_ADDR(port), reg, val); +} + +struct anx7440_id_t { + uint8_t val; + uint8_t reg; +}; + +static const struct anx7440_id_t anx7440_device_ids[] = { + { ANX7440_VENDOR_ID_L, ANX7440_REG_VENDOR_ID_L }, + { ANX7440_VENDOR_ID_H, ANX7440_REG_VENDOR_ID_H }, + { ANX7440_DEVICE_ID_L, ANX7440_REG_DEVICE_ID_L }, + { ANX7440_DEVICE_ID_H, ANX7440_REG_DEVICE_ID_H }, + { ANX7440_DEVICE_VERSION, ANX7440_REG_DEVICE_VERSION }, +}; + +static int anx7440_init(int port) +{ + int i; + int val; + int res; + + /* Verify device id / version registers */ + for (i = 0; i < ARRAY_SIZE(anx7440_device_ids); i++) { + res = anx7440_read(port, anx7440_device_ids[i].reg, &val); + if (res) + return res; + + if (val != anx7440_device_ids[i].val) + return EC_ERROR_UNKNOWN; + } + + return EC_SUCCESS; +} + +/* Writes control register to set switch mode */ +static int anx7440_set_mux(int port, mux_state_t mux_state) +{ + int reg, res; + + res = anx7440_read(port, ANX7440_REG_CHIP_CTRL, ®); + if (res) + return res; + + reg &= ~ANX7440_CHIP_CTRL_SW_OP_MODE_CLEAR; + if (mux_state & MUX_USB_ENABLED) + reg |= ANX7440_CHIP_CTRL_SW_OP_MODE_USB; + if (mux_state & MUX_DP_ENABLED) + reg |= ANX7440_CHIP_CTRL_SW_OP_MODE_DP; + if (mux_state & MUX_POLARITY_INVERTED) + reg |= ANX7440_CHIP_CTRL_SW_FLIP; + + return anx7440_write(port, ANX7440_REG_CHIP_CTRL, reg); +} + +/* Reads control register and updates mux_state accordingly */ +static int anx7440_get_mux(int port, mux_state_t *mux_state) +{ + int reg, res; + + *mux_state = 0; + res = anx7440_read(port, ANX7440_REG_CHIP_CTRL, ®); + if (res) + return res; + + if (reg & ANX7440_CHIP_CTRL_OP_MODE_FINAL_USB) + *mux_state |= MUX_USB_ENABLED; + if (reg & ANX7440_CHIP_CTRL_OP_MODE_FINAL_DP) + *mux_state |= MUX_DP_ENABLED; + if (reg & ANX7440_CHIP_CTRL_FINAL_FLIP) + *mux_state |= MUX_POLARITY_INVERTED; + + return EC_SUCCESS; +} + +const struct usb_mux_driver anx7440_usb_mux_driver = { + .init = anx7440_init, + .set = anx7440_set_mux, + .get = anx7440_get_mux, + /* TODO(b/146683781): add low power mode */ +}; |