ALSA: hda - Apply a proper chmap for built-in 2.1 speakers

When 2.1 speakers are detected, use the corresponding channel map
instead of the standard map with front+rear surrounds.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -3747,13 +3747,14 @@ static int add_std_chmaps(struct hda_codec *codec)
 			struct hda_pcm_stream *hinfo =
 				&codec->pcm_info[i].stream[str];
 			struct snd_pcm_chmap *chmap;
+			const struct snd_pcm_chmap_elem *elem;
 
 			if (codec->pcm_info[i].own_chmap)
 				continue;
 			if (!pcm || !hinfo->substreams)
 				continue;
-			err = snd_pcm_add_chmap_ctls(pcm, str,
-						     snd_pcm_std_chmaps,
+			elem = hinfo->chmap ? hinfo->chmap : snd_pcm_std_chmaps;
+			err = snd_pcm_add_chmap_ctls(pcm, str, elem,
 						     hinfo->channels_max,
 						     0, &chmap);
 			if (err < 0)
@@ -3764,6 +3765,19 @@ static int add_std_chmaps(struct hda_codec *codec)
 	return 0;
 }
 
+/* default channel maps for 2.1 speakers;
+ * since HD-audio supports only stereo, odd number channels are omitted
+ */
+const struct snd_pcm_chmap_elem snd_pcm_2_1_chmaps[] = {
+	{ .channels = 2,
+	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
+	{ .channels = 4,
+	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
+		   SNDRV_CHMAP_LFE, SNDRV_CHMAP_LFE } },
+	{ }
+};
+EXPORT_SYMBOL_GPL(snd_pcm_2_1_chmaps);
+
 int snd_hda_codec_build_controls(struct hda_codec *codec)
 {
 	int err = 0;

sound/pci/hda/hda_codec.h

@@ -757,6 +757,7 @@ struct hda_pcm_stream {
 	u32 rates;	/* supported rates */
 	u64 formats;	/* supported formats (SNDRV_PCM_FMTBIT_) */
 	unsigned int maxbps;	/* supported max. bit per sample */
+	const struct snd_pcm_chmap_elem *chmap; /* chmap to override */
 	struct hda_pcm_ops ops;
 };
 
@@ -1026,6 +1027,8 @@ unsigned int snd_hda_calc_stream_format(unsigned int rate,
 int snd_hda_is_supported_format(struct hda_codec *codec, hda_nid_t nid,
 				unsigned int format);
 
+extern const struct snd_pcm_chmap_elem snd_pcm_2_1_chmaps[];
+
 /*
  * Misc
  */

sound/pci/hda/patch_cirrus.c

@@ -344,6 +344,9 @@ static int cs_build_pcms(struct hda_codec *codec)
 	info->stream[SNDRV_PCM_STREAM_PLAYBACK].nid = spec->dac_nid[0];
 	info->stream[SNDRV_PCM_STREAM_PLAYBACK].channels_max =
 		spec->multiout.max_channels;
+	if (spec->speaker_2_1)
+		info->stream[SNDRV_PCM_STREAM_PLAYBACK].chmap =
+			snd_pcm_2_1_chmaps;
 	info->stream[SNDRV_PCM_STREAM_CAPTURE] = cs_pcm_analog_capture;
 	info->stream[SNDRV_PCM_STREAM_CAPTURE].nid =
 		spec->adc_nid[spec->cur_input];

sound/pci/hda/patch_conexant.c

@@ -337,6 +337,8 @@ static const struct hda_pcm_stream cx5051_pcm_analog_capture = {
 	},
 };
 
+static bool is_2_1_speaker(struct conexant_spec *spec);
+
 static int conexant_build_pcms(struct hda_codec *codec)
 {
 	struct conexant_spec *spec = codec->spec;
@@ -351,6 +353,9 @@ static int conexant_build_pcms(struct hda_codec *codec)
 		spec->multiout.max_channels;
 	info->stream[SNDRV_PCM_STREAM_PLAYBACK].nid =
 		spec->multiout.dac_nids[0];
+	if (is_2_1_speaker(spec))
+		info->stream[SNDRV_PCM_STREAM_PLAYBACK].chmap =
+			snd_pcm_2_1_chmaps;
 	if (spec->capture_stream)
 		info->stream[SNDRV_PCM_STREAM_CAPTURE] = *spec->capture_stream;
 	else {

sound/pci/hda/patch_realtek.c

@@ -2260,6 +2260,10 @@ static int alc_build_pcms(struct hda_codec *codec)
 		info->stream[SNDRV_PCM_STREAM_PLAYBACK].nid = spec->multiout.dac_nids[0];
 		info->stream[SNDRV_PCM_STREAM_PLAYBACK].channels_max =
 			spec->multiout.max_channels;
+		if (spec->autocfg.line_out_type == AUTO_PIN_SPEAKER_OUT &&
+		    spec->autocfg.line_outs == 2)
+			info->stream[SNDRV_PCM_STREAM_PLAYBACK].chmap =
+				snd_pcm_2_1_chmaps;
 	}
 	if (spec->adc_nids) {
 		p = spec->stream_analog_capture;

sound/pci/hda/patch_sigmatel.c

@@ -2516,6 +2516,11 @@ static int stac92xx_build_pcms(struct hda_codec *codec)
 	info->stream[SNDRV_PCM_STREAM_PLAYBACK] = stac92xx_pcm_analog_playback;
 	info->stream[SNDRV_PCM_STREAM_PLAYBACK].nid =
 		spec->multiout.dac_nids[0];
+	if (spec->autocfg.line_out_type == AUTO_PIN_SPEAKER_OUT &&
+	    spec->autocfg.line_outs == 2)
+		info->stream[SNDRV_PCM_STREAM_PLAYBACK].chmap =
+			snd_pcm_2_1_chmaps;
+
 	info->stream[SNDRV_PCM_STREAM_CAPTURE] = stac92xx_pcm_analog_capture;
 	info->stream[SNDRV_PCM_STREAM_CAPTURE].nid = spec->adc_nids[0];
 	info->stream[SNDRV_PCM_STREAM_CAPTURE].substreams = spec->num_adcs;

sound/pci/hda/patch_via.c

@@ -1555,6 +1555,10 @@ static int via_build_pcms(struct hda_codec *codec)
 				spec->multiout.dac_nids[0];
 			info->stream[SNDRV_PCM_STREAM_PLAYBACK].channels_max =
 				spec->multiout.max_channels;
+			if (spec->autocfg.line_out_type == AUTO_PIN_SPEAKER_OUT
+			    && spec->autocfg.line_outs == 2)
+				info->stream[SNDRV_PCM_STREAM_PLAYBACK].chmap =
+					snd_pcm_2_1_chmaps;
 		}
 
 		if (!spec->stream_analog_capture) {