[PATCH 4/4] hda: HDMI channel mapping cleanups

[Wu Fengguang <wfg@linux.intel.com>]

[-- Attachment #1: alsa-speakers2.patch --]
[-- Type: text/plain, Size: 2369 bytes --]

Refactor the channel mapping code for consistent naming
and make it more informed about channel allocations.

It still does nothing. Some blocking questions:
- how do we know ALSA audio stream's channel allocation?
	- ALSA sequence is front/surr/clfe/side?
	- what's the ALSA sequence for 3-9 channels?
- how do we map ALSA speakers(if available) to CEA speakers?
- Intel G45's channel mapping get verb seems to always return 0.
  that could be a trouble.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
---
 sound/pci/hda/patch_intelhdmi.c |   29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

--- sound-2.6.orig/sound/pci/hda/patch_intelhdmi.c
+++ sound-2.6/sound/pci/hda/patch_intelhdmi.c
@@ -276,7 +276,7 @@ static void hdmi_set_channel_count(struc
 				chs, hdmi_get_channel_count(codec));
 }
 
-static void hdmi_debug_slot_mapping(struct hda_codec *codec)
+static void hdmi_debug_channel_mapping(struct hda_codec *codec)
 {
 #ifdef CONFIG_SND_DEBUG_VERBOSE
 	int i;
@@ -291,13 +291,6 @@ static void hdmi_debug_slot_mapping(stru
 #endif
 }
 
-static void hdmi_setup_channel_mapping(struct hda_codec *codec)
-{
-	snd_hda_sequence_write(codec, def_chan_map);
-	hdmi_debug_slot_mapping(codec);
-}
-
-
 static void hdmi_parse_eld(struct hda_codec *codec)
 {
 	struct intel_hdmi_spec *spec = codec->spec;
@@ -445,6 +438,22 @@ static int hdmi_setup_channel_allocation
 	return -1;
 }
 
+static void hdmi_setup_channel_mapping(struct hda_codec *codec,
+					struct hdmi_audio_infoframe *ai)
+{
+	if (!ai->CA)
+		return;
+
+	/*
+	 * TODO: adjust channel mapping if necessary
+	 * ALSA sequence is front/surr/clfe/side?
+	 */
+
+	snd_hda_sequence_write(codec, def_chan_map);
+	hdmi_debug_channel_mapping(codec);
+}
+
+
 static void hdmi_setup_audio_infoframe(struct hda_codec *codec,
 					struct snd_pcm_substream *substream)
 {
@@ -456,6 +465,7 @@ static void hdmi_setup_audio_infoframe(s
 	};
 
 	hdmi_setup_channel_allocation(codec, &ai);
+	hdmi_setup_channel_mapping(codec, &ai);
 
 	hdmi_fill_audio_infoframe(codec, &ai);
 }
@@ -553,9 +563,6 @@ static int intel_hdmi_playback_pcm_prepa
 
 	hdmi_set_channel_count(codec, substream->runtime->channels);
 
-	/* wfg: channel mapping not supported by DEVCTG */
-	hdmi_setup_channel_mapping(codec);
-
 	hdmi_setup_audio_infoframe(codec, substream);
 
 	hdmi_enable_output(codec);

--