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Commit 09414207 authored by Daniel Mack's avatar Daniel Mack Committed by Takashi Iwai
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ALSA: usb-audio: export UAC2 clock selectors as mixer controls 



The UAC2 clock selectors are fortunately compatible with UAC1 audio
selector units, so we can simply reuse the same approach to get all the
linked units.

Requests to this control need a different CS value though.

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 67e1daa0

sound/usb/mixer.c

+35 −7
Original line number Diff line number Diff line
@@ -313,7 +313,7 @@ static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int v 
			      buf, sizeof(buf), 1000);



	if (ret < 0) {

		snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",

		snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",

			   request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);

		return ret;

	}
@@ -610,6 +610,7 @@ static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm 
 */

static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)

{

	int err;

	void *p1;



	memset(term, 0, sizeof(*term));
@@ -630,6 +631,11 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_ 
				term->channels = d->bNrChannels;

				term->chconfig = le32_to_cpu(d->bmChannelConfig);

				term->name = d->iTerminal;



				/* call recursively to get the clock selectors */

				err = check_input_term(state, d->bCSourceID, term);

				if (err < 0)

					return err;

			}

			return 0;

		case UAC_FEATURE_UNIT: {
@@ -646,7 +652,8 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_ 
			term->name = uac_mixer_unit_iMixer(d);

			return 0;

		}

		case UAC_SELECTOR_UNIT: {

		case UAC_SELECTOR_UNIT:

		case UAC2_CLOCK_SELECTOR: {

			struct uac_selector_unit_descriptor *d = p1;

			/* call recursively to retrieve the channel info */

			if (check_input_term(state, d->baSourceID[0], term) < 0)
@@ -669,6 +676,13 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_ 
			term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);

			return 0;

		}

		case UAC2_CLOCK_SOURCE: {

			struct uac_clock_source_descriptor *d = p1;

			term->type = d->bDescriptorSubtype << 16; /* virtual type */

			term->id = id;

			term->name = d->iClockSource;

			return 0;

		}

		default:

			return -ENODEV;

		}
@@ -1610,7 +1624,7 @@ static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_ 
	struct usb_mixer_elem_info *cval = kcontrol->private_data;

	int val, err;



	err = get_cur_ctl_value(cval, 0, &val);

	err = get_cur_ctl_value(cval, cval->control << 8, &val);

	if (err < 0) {

		if (cval->mixer->ignore_ctl_error) {

			ucontrol->value.enumerated.item[0] = 0;
@@ -1629,7 +1643,7 @@ static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_ 
	struct usb_mixer_elem_info *cval = kcontrol->private_data;

	int val, oval, err;



	err = get_cur_ctl_value(cval, 0, &oval);

	err = get_cur_ctl_value(cval, cval->control << 8, &oval);

	if (err < 0) {

		if (cval->mixer->ignore_ctl_error)

			return 0;
@@ -1638,7 +1652,7 @@ static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_ 
	val = ucontrol->value.enumerated.item[0];

	val = get_abs_value(cval, val);

	if (val != oval) {

		set_cur_ctl_value(cval, 0, val);

		set_cur_ctl_value(cval, cval->control << 8, val);

		return 1;

	}

	return 0;
@@ -1720,6 +1734,11 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void 
	cval->res = 1;

	cval->initialized = 1;



	if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)

		cval->control = UAC2_CX_CLOCK_SELECTOR;

	else

		cval->control = 0;



	namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);

	if (! namelist) {

		snd_printk(KERN_ERR "cannot malloc\n");
@@ -1769,7 +1788,9 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void 
		if (! len)

			strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));



		if ((state->oterm.type & 0xff00) == 0x0100)

		if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)

			append_ctl_name(kctl, " Clock Source");

		else if ((state->oterm.type & 0xff00) == 0x0100)

			append_ctl_name(kctl, " Capture Source");

		else

			append_ctl_name(kctl, " Playback Source");
@@ -1803,10 +1824,12 @@ static int parse_audio_unit(struct mixer_build *state, int unitid) 


	switch (p1[2]) {

	case UAC_INPUT_TERMINAL:

	case UAC2_CLOCK_SOURCE:

		return 0; /* NOP */

	case UAC_MIXER_UNIT:

		return parse_audio_mixer_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);
@@ -1903,6 +1926,11 @@ static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer) 
			err = parse_audio_unit(&state, desc->bSourceID);

			if (err < 0)

				return err;



			/* for UAC2, use the same approach to also add the clock selectors */

			err = parse_audio_unit(&state, desc->bCSourceID);

			if (err < 0)

				return err;

		}

	}