linux-kernel - [PATCH v5 29/32] sound: soc: qcom: q6usb: Add headphone jack for offload connection status

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Date:   Tue, 29 Aug 2023 14:06:54 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <lgirdwood@...il.com>, <andersson@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <gregkh@...uxfoundation.org>,
        <Thinh.Nguyen@...opsys.com>, <broonie@...nel.org>,
        <bgoswami@...cinc.com>, <tiwai@...e.com>, <robh+dt@...nel.org>,
        <agross@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v5 29/32] sound: soc: qcom: q6usb: Add headphone jack for offload connection status

The headphone jack framework has a well defined infrastructure 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@...cinc.com>
---
 sound/soc/qcom/qdsp6/q6usb.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/sound/soc/qcom/qdsp6/q6usb.c b/sound/soc/qcom/qdsp6/q6usb.c
index b67bf7cfc3ea..531d6c7700df 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,
@@ -323,6 +331,9 @@ static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb,
 
 	mutex_lock(&data->mutex);
 	if (connected) {
+		if (!data->available_card_slot)
+			snd_jack_report(data->hs_jack.jack, 1);
+
 		/*
 		 * Update the latest USB headset plugged in, if session is
 		 * idle.
@@ -338,6 +349,9 @@ static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb,
 		clear_bit(sdev->card_idx, &data->available_card_slot);
 		data->status[sdev->card_idx].num_pcm = 0;
 		data->status[sdev->card_idx].chip_index = 0;
+
+		if (!data->available_card_slot)
+			snd_jack_report(data->hs_jack.jack, 0);
 	}
 	mutex_unlock(&data->mutex);