ALSA: ens1370: Define channel maps

Provide channel maps for individual stereo streams of ENS1370 and
ENS1371.  Note that the configuration of ENS1370 uses the secondary
PCM as the front unlike ENS1371.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ens1370.c

@@ -1260,6 +1260,14 @@ static struct snd_pcm_ops snd_ensoniq_capture_ops = {
 	.pointer =	snd_ensoniq_capture_pointer,
 };
 
+static const struct snd_pcm_chmap_elem surround_map[] = {
+	{ .channels = 1,
+	  .map = { SNDRV_CHMAP_UNKNOWN } },
+	{ .channels = 2,
+	  .map = { SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
+	{ }
+};
+
 static int __devinit snd_ensoniq_pcm(struct ensoniq * ensoniq, int device,
 				     struct snd_pcm ** rpcm)
 {
@@ -1287,6 +1295,16 @@ static int __devinit snd_ensoniq_pcm(struct ensoniq * ensoniq, int device,
 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 					      snd_dma_pci_data(ensoniq->pci), 64*1024, 128*1024);
 
+#ifdef CHIP1370
+	err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				     surround_map, 2, 0, NULL);
+#else
+	err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				     snd_pcm_std_chmaps, 2, 0, NULL);
+#endif
+	if (err < 0)
+		return err;
+
 	if (rpcm)
 		*rpcm = pcm;
 	return 0;
@@ -1317,6 +1335,16 @@ static int __devinit snd_ensoniq_pcm2(struct ensoniq * ensoniq, int device,
 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 					      snd_dma_pci_data(ensoniq->pci), 64*1024, 128*1024);
 
+#ifdef CHIP1370
+	err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				     snd_pcm_std_chmaps, 2, 0, NULL);
+#else
+	err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				     surround_map, 2, 0, NULL);
+#endif
+	if (err < 0)
+		return err;
+
 	if (rpcm)
 		*rpcm = pcm;
 	return 0;