idt821034_set_gain_channel
ret = idt821034_set_gain_channel(idt821034, ch, gain_type, val);
ret = idt821034_set_gain_channel(idt821034, ch, gain_type,
ret = idt821034_set_gain_channel(idt821034, i, IDT821034_GAIN_RX,
ret = idt821034_set_gain_channel(idt821034, i, IDT821034_GAIN_TX,