i2c.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/i2c_simple.h>
#include <stdint.h>
 
int i2c_read_field(unsigned int 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 int 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;
}