ALSA: hda: hdmi: Hint matching between input devices and pcm devices

[David Henningsson <david.henningsson@canonical.com>]

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Since modern HDMI cards often have more than one output pin and thus
input device, we need to know which one has actually been plugged in.

This patch adds a name hint that indicates which PCM device is connected 
to which pin.

To do that, the jack creation has been deferred to build_controls, i e, 
after the PCM devices have been created.

Would be great to have Stephen look through this patch quickly before 
it's committed.

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic

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>From ab5ef7898ca0a6e86401428a3ca77f05db9eb7c9 Mon Sep 17 00:00:00 2001
From: David Henningsson <david.henningsson@canonical.com>
Date: Tue, 23 Aug 2011 16:56:03 +0200
Subject: [PATCH] ALSA: hda: hdmi: Hint matching between input devices and pcm devices

Since modern HDMI cards often have more than one output pin and thus
input device, we need to know which one has actually been plugged in.

This patch adds a name hint that indicates which PCM device is connected 
to which pin.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
---
 sound/pci/hda/patch_hdmi.c |   31 ++++++++++++++++++++++++-------
 1 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 19cb72d..8c83ec4 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -967,19 +967,12 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
 
 	per_pin->pin_nid = pin_nid;
 
-	err = snd_hda_input_jack_add(codec, pin_nid,
-				     SND_JACK_VIDEOOUT, NULL);
-	if (err < 0)
-		return err;
-
 	err = hdmi_read_pin_conn(codec, pin_idx);
 	if (err < 0)
 		return err;
 
 	spec->num_pins++;
 
-	hdmi_present_sense(codec, pin_nid, eld);
-
 	return 0;
 }
 
@@ -1162,6 +1155,25 @@ static int generic_hdmi_build_pcms(struct hda_codec *codec)
 	return 0;
 }
 
+static int generic_hdmi_build_jack(struct hda_codec *codec, int pin_idx)
+{
+	int err;
+	char hdmi_str[32];
+	struct hdmi_spec *spec = codec->spec;
+	struct hdmi_spec_per_pin *per_pin = &spec->pins[pin_idx];
+	int pcmdev = spec->pcm_rec[pin_idx].device;
+
+	snprintf(hdmi_str, sizeof(hdmi_str), "HDMI/DP (pcm %d)", pcmdev);
+
+	err = snd_hda_input_jack_add(codec, per_pin->pin_nid,
+			     SND_JACK_VIDEOOUT, pcmdev > 0 ? hdmi_str : NULL);
+	if (err < 0)
+		return err;
+
+	hdmi_present_sense(codec, per_pin->pin_nid, &per_pin->sink_eld);
+	return 0;
+}
+
 static int generic_hdmi_build_controls(struct hda_codec *codec)
 {
 	struct hdmi_spec *spec = codec->spec;
@@ -1170,6 +1182,11 @@ static int generic_hdmi_build_controls(struct hda_codec *codec)
 
 	for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
 		struct hdmi_spec_per_pin *per_pin = &spec->pins[pin_idx];
+
+		err = generic_hdmi_build_jack(codec, pin_idx);
+		if (err < 0)
+			return err;
+
 		err = snd_hda_create_spdif_out_ctls(codec,
 						    per_pin->pin_nid,
 						    per_pin->mux_nids[0]);
-- 
1.7.4.1


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