snd_vx_check_reg_bit
int snd_vx_check_reg_bit(struct vx_core *chip, int reg, int mask, int bit, int time);
#define vx_check_isr(chip,mask,bit,time) snd_vx_check_reg_bit(chip, VX_ISR, mask, bit, time)
EXPORT_SYMBOL(snd_vx_check_reg_bit);
if (snd_vx_check_reg_bit(chip, VX_CVR, CVR_HC, 0, 200) < 0)