AK4113_RST
reg_write(chip, AK4113_REG_PWRDN, old & ~(AK4113_RST|AK4113_PWN));
reg_write(chip, AK4113_REG_PWRDN, (old | AK4113_RST) & ~AK4113_PWN);
reg_write(chip, AK4113_REG_PWRDN, old | AK4113_RST | AK4113_PWN);
/* AK4113_REG_PWRDN */ AK4113_RST | AK4113_PWN |