AK4114_PWN
reg_write(chip, AK4114_REG_PWRDN, old & ~(AK4114_RST|AK4114_PWN));
reg_write(chip, AK4114_REG_PWRDN, (old | AK4114_RST) & ~AK4114_PWN);
reg_write(chip, AK4114_REG_PWRDN, old | AK4114_RST | AK4114_PWN);
/* AK4117_REG_PWRDN */ AK4114_RST | AK4114_PWN |
AK4114_RST | AK4114_PWN | AK4114_OCKS0 | AK4114_OCKS1,
AK4114_RST | AK4114_PWN | AK4114_OCKS0,