ALSA: usb-audio: UAC3 Add support for connector insertion.

This adds support for the UAC3 insertion controls. The status
is reported as a boolean value in the same way it used to do
for UAC2. Hence, the presence of any connector in the response
will make the control saying the jack is connected.

The UAC2 support for this control has been moved to a dedicated
control for connectors as both UAC2 and UAC3 follow a specific
Control Request Parameter Block for this control. This parameter
block for UAC3 could not be read in the same simplistic
manner as in UAC2.

This implementation is not requesting additional information
from the HIGH CAPABILITY Connectors descriptor.

Tested with an UAC3 device with UAC2 as legacy configuration.
The connector status can be read with `amixer` and the interrupt
is also caught with `alsactl monitor`.

Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Tested-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 94 insertions, 14 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index c4abb3bca2ad..fb77847cbffc 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1328,6 +1328,51 @@ static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+/* get the connectors status and report it as boolean type */
+static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct usb_mixer_elem_info *cval = kcontrol->private_data;
+	struct snd_usb_audio *chip = cval->head.mixer->chip;
+	int idx = 0, validx, ret, val;
+
+	validx = cval->control << 8 | 0;
+
+	ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
+	if (ret)
+		goto error;
+
+	idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
+	if (cval->head.mixer->protocol == UAC_VERSION_2) {
+		struct uac2_connectors_ctl_blk uac2_conn;
+
+		ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
+				      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
+				      validx, idx, &uac2_conn, sizeof(uac2_conn));
+		val = !!uac2_conn.bNrChannels;
+	} else { /* UAC_VERSION_3 */
+		struct uac3_insertion_ctl_blk uac3_conn;
+
+		ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
+				      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
+				      validx, idx, &uac3_conn, sizeof(uac3_conn));
+		val = !!uac3_conn.bmConInserted;
+	}
+
+	snd_usb_unlock_shutdown(chip);
+
+	if (ret < 0) {
+error:
+		usb_audio_err(chip,
+			"cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
+			UAC_GET_CUR, validx, idx, cval->val_type);
+		return ret;
+	}
+
+	ucontrol->value.integer.value[0] = val;
+	return 0;
+}
+
 static struct snd_kcontrol_new usb_feature_unit_ctl = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "", /* will be filled later manually */
@@ -1358,6 +1403,15 @@ static struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
 	.put = NULL,
 };
 
+static const struct snd_kcontrol_new usb_connector_ctl_ro = {
+	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
+	.name = "", /* will be filled later manually */
+	.access = SNDRV_CTL_ELEM_ACCESS_READ,
+	.info = snd_ctl_boolean_mono_info,
+	.get = mixer_ctl_connector_get,
+	.put = NULL,
+};
+
 /*
  * This symbol is exported in order to allow the mixer quirks to
  * hook up to the standard feature unit control mechanism
@@ -1626,17 +1680,25 @@ static void build_connector_control(struct mixer_build *state,
 		return;
 	snd_usb_mixer_elem_init_std(&cval->head, state->mixer, term->id);
 	/*
-	 * The first byte from reading the UAC2_TE_CONNECTOR control returns the
-	 * number of channels connected.  This boolean ctl will simply report
-	 * if any channels are connected or not.
-	 * (Audio20_final.pdf Table 5-10: Connector Control CUR Parameter Block)
+	 * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
+	 * number of channels connected.
+	 *
+	 * UAC3: The first byte specifies size of bitmap for the inserted controls. The
+	 * following byte(s) specifies which connectors are inserted.
+	 *
+	 * This boolean ctl will simply report if any channels are connected
+	 * or not.
 	 */
-	cval->control = UAC2_TE_CONNECTOR;
+	if (state->mixer->protocol == UAC_VERSION_2)
+		cval->control = UAC2_TE_CONNECTOR;
+	else /* UAC_VERSION_3 */
+		cval->control = UAC3_TE_INSERTION;
+
 	cval->val_type = USB_MIXER_BOOLEAN;
 	cval->channels = 1; /* report true if any channel is connected */
 	cval->min = 0;
 	cval->max = 1;
-	kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
+	kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
 	if (!kctl) {
 		usb_audio_err(state->chip, "cannot malloc kcontrol\n");
 		kfree(cval);
@@ -1954,16 +2016,28 @@ static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
 				      void *raw_desc)
 {
 	struct usb_audio_term iterm;
-	struct uac2_input_terminal_descriptor *d = raw_desc;
+	unsigned int control, bmctls, term_id;
 
-	check_input_term(state, d->bTerminalID, &iterm);
 	if (state->mixer->protocol == UAC_VERSION_2) {
-		/* Check for jack detection. */
-		if (uac_v2v3_control_is_readable(le16_to_cpu(d->bmControls),
-						 UAC2_TE_CONNECTOR)) {
-			build_connector_control(state, &iterm, true);
-		}
+		struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
+		control = UAC2_TE_CONNECTOR;
+		term_id = d_v2->bTerminalID;
+		bmctls = le16_to_cpu(d_v2->bmControls);
+	} else if (state->mixer->protocol == UAC_VERSION_3) {
+		struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
+		control = UAC3_TE_INSERTION;
+		term_id = d_v3->bTerminalID;
+		bmctls = le32_to_cpu(d_v3->bmControls);
+	} else {
+		return 0; /* UAC1. No Insertion control */
 	}
+
+	check_input_term(state, term_id, &iterm);
+
+	/* Check for jack detection. */
+	if (uac_v2v3_control_is_readable(bmctls, control))
+		build_connector_control(state, &iterm, true);
+
 	return 0;
 }
 
@@ -2554,7 +2628,7 @@ static int parse_audio_unit(struct mixer_build *state, int unitid)
 	} else { /* UAC_VERSION_3 */
 		switch (p1[2]) {
 		case UAC_INPUT_TERMINAL:
-			return 0; /* NOP */
+			return parse_audio_input_terminal(state, unitid, p1);
 		case UAC3_MIXER_UNIT:
 			return parse_audio_mixer_unit(state, unitid, p1);
 		case UAC3_CLOCK_SOURCE:
@@ -2932,6 +3006,12 @@ static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
 			err = parse_audio_unit(&state, desc->bCSourceID);
 			if (err < 0 && err != -EINVAL)
 				return err;
+
+			if (uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
+							 UAC3_TE_INSERTION)) {
+				build_connector_control(&state, &state.oterm,
+							false);
+			}
 		}
 	}