B43_LPPHY_AFE_DAC_CTL
b43_phy_mask(dev, B43_LPPHY_AFE_DAC_CTL, 0xF7FF);
b43_phy_set(dev, B43_LPPHY_AFE_DAC_CTL, 0x0004);
b43_phy_write(dev, B43_LPPHY_AFE_DAC_CTL, 0x50);
gains.dac = (b43_phy_read(dev, B43_LPPHY_AFE_DAC_CTL) & 0x380) >> 7;
u16 ctl = b43_phy_read(dev, B43_LPPHY_AFE_DAC_CTL) & 0xC7F;
b43_phy_maskset(dev, B43_LPPHY_AFE_DAC_CTL, 0xF000, ctl);