viacam_read_reg
int tmp = viacam_read_reg(cam, reg);
icv = viacam_read_reg(cam, VCR_INTCTRL);
bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3;
(void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
(void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */