i2c_read_reg
res = i2c_read_reg(i2c, adr, 0x20 | (address & 3), &val);
i2c_read_reg(i2c, adr, 0x01, &val);
return i2c_read_reg(i2c, adr, 0, &val) ? 0 : 1;
int ret = i2c_read_reg(&port->i2c->adap, 0x20, 0, &val);
i2c_read_reg(i2c, 0x10, 0x08, &val);
i2c_read_reg(i2c, 0x10, 0x08, &val);
status = i2c_read_reg(i2c, 0x6e, 0xfd, id);
i2c_read_reg(&dev->i2c[num].adap, 0x10, 0x08, &v);
i2c_read_reg(i2c, addr, 0x08, &val);