static int parse_audio_unit(struct mixer_build *state, int unitid)
{
	unsigned char *p1;
	int protocol = state->mixer->protocol;

	if (test_and_set_bit(unitid, state->unitbitmap))
		return 0; /* the unit already visited */

	p1 = find_audio_control_unit(state, unitid);
	if (!p1) {
		usb_audio_err(state->chip, "unit %d not found!\n", unitid);
		return -EINVAL;
	}

	if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
		switch (p1[2]) {
		case UAC_INPUT_TERMINAL:
			return parse_audio_input_terminal(state, unitid, p1);
		case UAC_MIXER_UNIT:
			return parse_audio_mixer_unit(state, unitid, p1);
		case UAC2_CLOCK_SOURCE:
			return parse_clock_source_unit(state, unitid, p1);
		case UAC_SELECTOR_UNIT:
		case UAC2_CLOCK_SELECTOR:
			return parse_audio_selector_unit(state, unitid, p1);
		case UAC_FEATURE_UNIT:
			return parse_audio_feature_unit(state, unitid, p1);
		case UAC1_PROCESSING_UNIT:
		/*   UAC2_EFFECT_UNIT has the same value */
			if (protocol == UAC_VERSION_1)
				return parse_audio_processing_unit(state, unitid, p1);
			else
				return 0; /* FIXME - effect units not implemented yet */
		case UAC1_EXTENSION_UNIT:
		/*   UAC2_PROCESSING_UNIT_V2 has the same value */
			if (protocol == UAC_VERSION_1)
				return parse_audio_extension_unit(state, unitid, p1);
			else /* UAC_VERSION_2 */
				return parse_audio_processing_unit(state, unitid, p1);
		case UAC2_EXTENSION_UNIT_V2:
			return parse_audio_extension_unit(state, unitid, p1);
		default:
			usb_audio_err(state->chip,
				"unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
			return -EINVAL;
		}
	} else { /* UAC_VERSION_3 */
		switch (p1[2]) {
		case UAC_INPUT_TERMINAL:
			return parse_audio_input_terminal(state, unitid, p1);
		case UAC3_MIXER_UNIT:
			return parse_audio_mixer_unit(state, unitid, p1);
		case UAC3_CLOCK_SOURCE:
			return parse_clock_source_unit(state, unitid, p1);
		case UAC3_SELECTOR_UNIT:
		case UAC3_CLOCK_SELECTOR:
			return parse_audio_selector_unit(state, unitid, p1);
		case UAC3_FEATURE_UNIT:
			return parse_audio_feature_unit(state, unitid, p1);
		case UAC3_EFFECT_UNIT:
			return 0; /* FIXME - effect units not implemented yet */
		case UAC3_PROCESSING_UNIT:
			return parse_audio_processing_unit(state, unitid, p1);
		case UAC3_EXTENSION_UNIT:
			return parse_audio_extension_unit(state, unitid, p1);
		default:
			usb_audio_err(state->chip,
				"unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
			return -EINVAL;
		}
	}
}
Unknown