Update the bits on the given register
int snd_ac97_update_bits(struct snd_ac97 * ac97, unsigned short reg, unsigned short mask, unsigned short value);
ac97
the ac97 instance
reg
the register to change
mask
the bit-mask to change
value
the value to set
Updates the masked-bits on the given register only when the value is changed.
1 if the bits are changed, 0 if no change, or a negative code on failure.