/* * 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; }