ALSA: x86: Implement jack control

This patch implements a jack interface for notifying HDMI/DP
connection.  PA listens to this, so it can handle the monitor
connection more gracefully.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/x86/intel_hdmi_audio.c

@@ -37,6 +37,7 @@
 #include <sound/pcm_params.h>
 #include <sound/initval.h>
 #include <sound/control.h>
+#include <sound/jack.h>
 #include <drm/drm_edid.h>
 #include <drm/intel_lpe_audio.h>
 #include "intel_hdmi_audio.h"
@@ -1382,6 +1383,8 @@ static void had_process_hot_plug(struct snd_intelhad *intelhaddata)
 	}
 
 	had_build_channel_allocation_map(intelhaddata);
+
+	snd_jack_report(intelhaddata->jack, SND_JACK_AVOUT);
 }
 
 /* process hot unplug, called from wq with mutex locked */
@@ -1414,6 +1417,7 @@ static void had_process_hot_unplug(struct snd_intelhad *intelhaddata)
 		snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
 
  out:
+	snd_jack_report(intelhaddata->jack, 0);
 	if (substream)
 		had_substream_put(intelhaddata);
 	kfree(intelhaddata->chmap->chmap);
@@ -1608,6 +1612,21 @@ static void had_audio_wq(struct work_struct *work)
 	pm_runtime_put(ctx->dev);
 }
 
+/*
+ * Jack interface
+ */
+static int had_create_jack(struct snd_intelhad *ctx)
+{
+	int err;
+
+	err = snd_jack_new(ctx->card, "HDMI/DP", SND_JACK_AVOUT, &ctx->jack,
+			   true, false);
+	if (err < 0)
+		return err;
+	ctx->jack->private_data = ctx;
+	return 0;
+}
+
 /*
  * PM callbacks
  */
@@ -1780,6 +1799,10 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err;
 
+	ret = had_create_jack(ctx);
+	if (ret < 0)
+		goto err;
+
 	ret = snd_card_register(card);
 	if (ret)
 		goto err;

sound/x86/intel_hdmi_audio.h

@@ -130,6 +130,7 @@ struct snd_intelhad {
 	struct work_struct hdmi_audio_wq;
 	struct mutex mutex; /* for protecting chmap and eld */
 	bool need_reset;
+	struct snd_jack *jack;
 };
 
 #endif /* _INTEL_HDMI_AUDIO_ */