diff options
Diffstat (limited to 'src/device/i2c.c')
-rw-r--r-- | src/device/i2c.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/device/i2c.c b/src/device/i2c.c new file mode 100644 index 0000000000..53bfdf0c94 --- /dev/null +++ b/src/device/i2c.c @@ -0,0 +1,46 @@ +/* + * 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; +} |