| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2016 MediaTek Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <device/i2c.h> |
| |
| int i2c_read_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t *data, |
| uint8_t mask, uint8_t shift) |
| { |
| int ret; |
| uint8_t buf = 0; |
| |
| ret = i2c_readb(bus, chip, reg, &buf); |
| |
| buf &= (mask << shift); |
| *data = (buf >> shift); |
| |
| return ret; |
| } |
| |
| int i2c_write_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t data, |
| uint8_t mask, uint8_t shift) |
| { |
| int ret; |
| uint8_t buf = 0; |
| |
| ret = i2c_readb(bus, chip, reg, &buf); |
| |
| buf &= ~(mask << shift); |
| buf |= (data << shift); |
| |
| ret |= i2c_writeb(bus, chip, reg, buf); |
| |
| return ret; |
| } |