[PATCH v4 29/32] sound: soc: qcom: q6usb: Add headphone jack for offload connection status

[Wesley Cheng <quic_wcheng@xxxxxxxxxxx>]

The headphone jack framework has a well defined intrastructure for
notifying userspace entities through input devices.  Expose a jack device
that carries information about if an offload capable device is connected.
Applications can further identify specific offloading information through
other SND kcontrols.

Signed-off-by: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
---
 sound/soc/qcom/qdsp6/q6usb.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/sound/soc/qcom/qdsp6/q6usb.c b/sound/soc/qcom/qdsp6/q6usb.c
index e4ccb9d912b0..860dff8c1438 100644
--- a/sound/soc/qcom/qdsp6/q6usb.c
+++ b/sound/soc/qcom/qdsp6/q6usb.c
@@ -20,6 +20,7 @@
 #include <sound/pcm_params.h>
 #include <sound/asound.h>
 #include <sound/q6usboffload.h>
+#include <sound/jack.h>
 
 #include "q6dsp-lpass-ports.h"
 #include "q6afe.h"
@@ -37,6 +38,7 @@ struct q6usb_status {
 struct q6usb_port_data {
 	struct q6afe_usb_cfg usb_cfg;
 	struct snd_soc_usb *usb;
+	struct snd_soc_jack hs_jack;
 	struct q6usb_offload priv;
 	struct mutex mutex;
 	unsigned long available_card_slot;
@@ -279,6 +281,7 @@ static const struct snd_kcontrol_new q6usb_offload_control = {
 /* Build a mixer control for a UAC connector control (jack-detect) */
 static void q6usb_connector_control_init(struct snd_soc_component *component)
 {
+	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
 	int ret;
 
 	ret = snd_ctl_add(component->card->snd_card,
@@ -290,6 +293,11 @@ static void q6usb_connector_control_init(struct snd_soc_component *component)
 				snd_ctl_new1(&q6usb_offload_dev_ctrl, component));
 	if (ret < 0)
 		return;
+
+	ret = snd_soc_card_jack_new(component->card, "USB offload",
+					SND_JACK_HEADSET, &data->hs_jack);
+	if (ret)
+		return;
 }
 
 static int q6usb_audio_ports_of_xlate_dai_name(struct snd_soc_component *component,
@@ -322,7 +330,10 @@ static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb, int card_idx,
 
 	mutex_lock(&data->mutex);
 	if (connected) {
-		snd_soc_dapm_enable_pin(dapm, "USB_RX_BE");
+		if (!data->available_card_slot) {
+			snd_soc_dapm_enable_pin(dapm, "USB_RX_BE");
+			snd_jack_report(data->hs_jack.jack, 1);
+		}
 		/*
 		 * Update the latest USB headset plugged in, if session is
 		 * idle.
@@ -338,8 +349,10 @@ static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb, int card_idx,
 		clear_bit(card_idx, &data->available_card_slot);
 		data->status[card_idx].num_pcm = 0;
 		data->status[card_idx].chip_index = 0;
-		if (!data->available_card_slot)
+		if (!data->available_card_slot) {
 			snd_soc_dapm_disable_pin(dapm, "USB_RX_BE");
+			snd_jack_report(data->hs_jack.jack, 0);
+		}
 	}
 	snd_soc_dapm_sync(dapm);
 	mutex_unlock(&data->mutex);